WO2015176255A1

WO2015176255A1 - Method and device for transmitting demodulation reference signal

Info

Publication number: WO2015176255A1
Application number: PCT/CN2014/078030
Authority: WO
Inventors: 黎超
Original assignee: 华为技术有限公司
Priority date: 2014-05-21
Filing date: 2014-05-21
Publication date: 2015-11-26
Also published as: CN106233816A; CN106233816B

Abstract

The present invention provides a method and device for transmitting a demodulation reference signal. The method comprises: a first device determines a location for sending a demodulation reference signal in a physical resource block, the location for sending the demodulation reference signal comprising a mapping location of a channel state information reference signal (CSI-RS) that is used and/or not used by the first device, and the demodulation reference signal being used for demodulating data of a second user equipment; the first device sends configuration information to the second user equipment, the configuration information being used for indicating the location of the demodulation reference signal in the physical resource block; and the first device sends the demodulation reference signal at the location for sending the demodulation reference signal in the physical resource block. By using the technical scheme provided in an embodiment of the present invention, demodulation of downlink user data of more users can be supported.

Description

Demodulation reference signal transmission method and device

The present invention relates to communication technologies, and in particular, to a transmission method and apparatus for demodulating reference signals. Background technique

The combination of Multiple-Input Multiple-Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) systems brings the transmission capability of wireless communication systems to a whole new height. The 4th generation cellular mobile communication system represented by the 10th edition of the Long Term Evolution (LTE) protocol (Release-10, Rel-10) supports MIMO of up to 8 transmit antennas of the base station. The single-user multiple-input-multiple-output (SU-MIMO) transmission capability is limited by the number of antennas and antenna isolation of a single user. Therefore, SU-MIMO is currently the mainstream. Two cross-polarized antennas can be implemented on a smaller device such as a mobile phone. That is, the current mainstream SU-MIMO can support up to 2 streams. In order to improve the transmission capacity of the cell, Multi-User-Multiple-Input Multiple-Output (MU-MIMO) can provide multiple users due to space in the user. The gain brought about by the separation.

The existing LTE system version Rel-10 supports up to 8 streams of demodulation reference signals. Therefore, for multi-input multi-input and multi-output scenarios, it is unable to support the downlink user data demodulation of more users. SUMMARY OF THE INVENTION The present invention provides a method and a device for transmitting a demodulation reference signal, which are used to solve the problem of downlink user data demodulation in which the existing LTE system version Rel-10 cannot support more users.

A first aspect of the present invention provides a method for transmitting a demodulation reference signal, including: determining, by a first device, a location of transmitting a demodulation reference signal in a physical resource block, where the location of the demodulation reference signal includes the Channel status information that has been used and/or unused by a device a mapping position of the reference signal CSI-RS, the demodulation reference signal is used to demodulate data of the second user equipment;

The first device sends configuration information to the second user equipment, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block;

The first device transmits the demodulation reference signal at a location where the demodulation reference signal is transmitted in the physical resource block.

In a first possible implementation manner, according to the first aspect, the configuration information is non-zero power CSI-RS signaling.

In a second possible implementation, in combination with the first aspect or the first possible implementation, the determining, by the first device, the location of the demodulation reference signal in the physical resource block, specifically: the first device Determining, according to channel state information of the second user equipment, a location at which the demodulation reference signal is transmitted in the physical resource block.

In a third possible implementation manner, in combination with the first aspect, the first possible implementation manner, and the second possible implementation manner, the first device sends the demodulation reference signal in the physical resource block. Before the location of the demodulation reference signal is sent, the method further includes:

The first device sends a precoding indication to the second user equipment, where the precoding indicates precoding information for indicating user data of the second user equipment, so that the second user equipment is configured according to the Demodulating a reference signal and the precoding information for user data demodulation, the demodulation reference signal comprising a CSI-RS for performing a channel measurement operation or a first downlink demodulation reference signal for performing user data demodulation a DM-RS, wherein the first DM-RS maps a DM-RS at a position where the demodulation reference signal is transmitted in the physical resource block according to a mapping manner of a CSI-RS.

In a fourth possible implementation, in combination with the first aspect, the first possible implementation manner, and the second possible implementation manner, the first device sends the demodulation reference signal in the physical resource block. Before the location of the demodulation reference signal is sent, the method further includes:

The first device performs precoding on the demodulation reference signal, where the demodulation reference signal is specifically a second DM-RS for performing user data demodulation, and the second DM-RS is according to a preset The mapping mode maps the DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

In a fifth possible implementation manner, combining the first aspect, the first possible implementation manner, the second possible implementation manner, the third possible implementation manner, and the fourth possible implementation manner, Before the first device sends the demodulation reference signal in the location of the physical resource block to send the demodulation reference signal, the method further includes:

The first device sends first indication information to the second user equipment, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in a physical resource block.

In a sixth possible implementation, in combination with the fifth possible implementation, if the physical resource block includes a location for sending the DM-RS to the at least one first user equipment, the first indication information indicates The location includes the location at which the DM-RS is transmitted to the at least one first user equipment.

In a seventh possible implementation, the first aspect, the first possible implementation, the first possible implementation, the second possible implementation, the third possible implementation, and the fourth a possible implementation manner, a fifth possible implementation manner, and a sixth possible implementation manner, where the first device sends the demodulation reference signal at a location where the demodulation reference signal is sent in the physical resource block Previously, it also included:

The first device sends the second indication information to the at least one first user, where the second indication information is used to indicate that the second user equipment sends the location of the demodulation reference signal, so that the third device Performing rate matching or interference according to the location where the second user equipment sends the demodulation reference signal, in an eighth possible implementation manner, combining the first aspect, combining the first aspect, the first possible implementation manner, the first type Possible implementation manner, second possible implementation manner, third possible implementation manner, fourth possible implementation manner, fifth possible implementation manner, sixth possible implementation manner, and seventh possible And after the sending, by the first device, the demodulation reference signal in the location where the demodulation reference signal is sent in the physical resource block, the method further includes:

The first device sends a third indication signaling to the base station, where the third indication signaling is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the base station reserves the second user. The device sends the location of the demodulation reference signal.

A second aspect of the present invention provides a method for transmitting a demodulation reference signal, including: receiving, by a second user equipment, configuration information sent by a first device, where the configuration information is used to indicate that the demodulation reference signal is in the physical The location in the resource block;

The second user equipment receives the demodulation reference signal sent by the first device at a location indicated by the configuration information in the physical resource block, where the location indicated by the configuration information includes the A mapping location of a CSI-RS that has been used and/or unused by the first device, the demodulation reference signal being used to demodulate data of the second user equipment.

In a first possible implementation, the second user equipment receives the demodulation reference signal sent by the first device at a location indicated by the configuration information in the physical resource block. Previously, it also included:

Receiving, by the second user equipment, a precoding indication sent by the first device;

Obtaining, by the second user equipment, precoding information of user data of the second user equipment according to the precoding indication;

After the second user equipment receives the demodulation reference signal sent by the first device in the location indicated by the configuration information in the physical resource block, the method further includes:

The second user equipment performs user data demodulation according to the demodulation reference signal and the precoding information;

The demodulation reference signal includes a CSI-RS for performing a channel measurement operation or a first downlink demodulation reference signal DM-RS for performing user data demodulation, and the first DM-RS is according to CSI. The mapping manner of the -RS maps the DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

In a second possible implementation manner, according to the second aspect, the demodulation reference signal is a second DM-RS for performing user data demodulation after precoding, and the second DM-RS is The preset mapping manner maps the DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

In a third possible implementation manner, in combination with the second aspect, the first possible implementation manner, and the second possible implementation manner, the second user equipment is configured by the configuration information in the physical resource block. Before receiving the demodulation reference signal sent by the first device, the method further includes: the second user equipment receiving the first indication information sent by the first device, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in the physical resource block;

And the second user equipment performs rate matching or interference measurement according to a location in the physical resource block indicated by the first indication information.

A third aspect of the present invention provides a first device, including:

a determining module, configured to determine a location of transmitting a demodulation reference signal in the physical resource block, where the The location of the demodulation reference signal includes a mapping location of the channel state information reference signal CSI-RS that has been used by the first device and/or is used, and the demodulation reference signal is used to demodulate the second user equipment The data;

a sending module, configured to send configuration information to the second user equipment, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block;

The sending module is further configured to send the demodulation reference signal at a location where the demodulation reference signal is sent in the physical resource block.

In a first possible implementation, the determining module is specifically configured to: determine, according to channel state information of the second user equipment, where to send a demodulation reference signal in the physical resource block. .

In a second possible implementation manner, in combination with the third aspect or the first possible implementation manner, the sending module is further configured to:

Sending, to the second user equipment, a precoding indication, where the precoding indicates precoding information for indicating user data of the second user equipment, so that the second user equipment is configured according to the demodulation reference signal and The precoding information is subjected to user data demodulation, and the demodulation reference signal includes a CSI-RS for performing a channel measurement operation or a first downlink demodulation reference signal DM-RS for performing user data demodulation. The first DM-RS maps the DM-RS at the location of the transmit demodulation reference signal in the physical resource block according to a mapping manner of the CSI-RS.

In a third possible implementation, in combination with the third aspect or the first possible implementation, the first device further includes:

An encoding module, configured to perform precoding on the demodulation reference signal, where the demodulation reference signal is specifically a second DM-RS for performing user data demodulation, and the second DM-RS is according to a preset The mapping mode maps the DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

In a fourth possible implementation, in combination with the third aspect, the first possible implementation manner, the second possible implementation manner, and the third possible implementation manner, the sending module is further configured to: The second user equipment sends the first indication information, where the first indication information is used to indicate the location where the second user equipment performs rate matching or interference measurement in the physical resource block.

In a fifth possible implementation manner, combining the third aspect, the first possible implementation manner, the second possible implementation manner, the third possible implementation manner, and the fourth possible implementation manner, The sending module is further configured to:

Sending the second indication information to the at least one first user equipment, where the second indication information is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the at least one first user equipment The second user equipment sends the location of the demodulation reference signal for rate matching or performs the sixth possible implementation, in combination with the third aspect, the first possible implementation manner, the second possible implementation manner, and the third A possible implementation manner, a fourth possible implementation manner, and a fifth possible implementation manner, where the sending module is further configured to:

And sending, by the base station, third indication signaling, where the third indication signaling is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the base station reserves the second user equipment to send a demodulation reference. The location of the signal.

A fourth aspect of the present invention provides a second user equipment, including:

a receiving module, configured to receive configuration information sent by the first device, where the configuration information is used to indicate a location of the demodulation reference signal in a physical resource block;

a determining module, configured to determine, according to the configuration information received by the receiving module, a location of the demodulation reference signal in the physical resource block;

The receiving module is further configured to receive the demodulation reference signal sent by the first device by using the demodulation reference signal determined by the determining module in a location in the physical resource block, where the determining module determines The location of the demodulation reference signal in the physical resource block includes a mapping location of a CSI-RS that has been used and/or unused by the first device, the demodulation reference signal being used to demodulate the The data of the second user equipment.

In a first possible implementation manner, the receiving module is further configured to: receive a precoding indication sent by the first device, according to the fourth aspect;

Obtaining, according to the precoding indication, precoding information of user data of the second user equipment;

The second user equipment further includes:

a demodulation module, configured to perform user data demodulation according to the demodulation reference signal and the precoding information;

The demodulation reference signal includes a CSI-RS for performing a channel measurement operation or a first downlink demodulation reference signal DM-RS for performing user data demodulation, where the first DM-RS is The mapping manner of the CSI-RS maps the DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

In a second possible implementation, in combination with the fourth aspect or the first possible implementation, the receiving module is further configured to:

And receiving, by the first device, first indication information, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in a physical resource block;

Rate matching or interference measurement is performed according to the location in the physical resource block indicated by the first indication information.

A fifth aspect of the present invention provides a first device, including:

a processor, configured to determine a location of transmitting a demodulation reference signal in a physical resource block, where the location of the transmit demodulation reference signal includes a channel state information reference signal CSI that has been used by the first device and/or is not used a mapping position of the RS, the demodulation reference signal is used to demodulate data of the second user equipment;

a transmitter, configured to send configuration information to the second user equipment, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block;

The transmitter is further configured to transmit the demodulation reference signal at a location where the demodulation reference signal is transmitted in the physical resource block.

In a first possible implementation manner, the processor is specifically configured to: determine, according to channel state information of the second user equipment, where to send a demodulation reference signal in the physical resource block. .

In a second possible implementation, in combination with the fifth aspect or the first possible implementation, the transmitter is further configured to:

In a third possible implementation, in combination with the fifth aspect or the first possible implementation, the processor is further configured to: Pre-coding the demodulation reference signal, where the demodulation reference signal is specifically a second DM-RS for performing user data demodulation, and the second DM-RS is mapped according to a preset mapping manner. The DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

In a fourth possible implementation, in combination with the fifth aspect, the first possible implementation manner, the second possible implementation manner, and the third possible implementation manner, the transmitter is further configured to:

Sending, to the second user equipment, first indication information, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in a physical resource block.

In a fifth possible implementation, in combination with the fifth aspect, the first possible implementation manner, the second possible implementation manner, the third possible implementation manner, and the fourth possible implementation manner, the sending Also used to:

Sending the second indication information to the at least one first user equipment, where the second indication information is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the at least one first user equipment The second user equipment sends the location of the demodulation reference signal for rate matching or performs the sixth possible implementation, in combination with the fifth aspect, the first possible implementation manner, the second possible implementation manner, and the third A possible implementation, a fourth possible implementation, and a fifth possible implementation, the transmitter is further configured to:

A sixth aspect of the present invention provides a second user equipment, including:

a receiver, configured to receive configuration information sent by the first device, where the configuration information is used to indicate a location of the demodulation reference signal in a physical resource block;

a processor, configured to determine, according to the configuration information received by the receiver, a location of the demodulation reference signal in the physical resource block;

The receiver is further configured to receive, by the processor, the demodulation reference signal sent by the first device at a position of the demodulation reference signal in the physical resource block, where the processor determines The location of the demodulation reference signal in the physical resource block includes a mapping location of a CSI-RS that has been used and/or unused by the first device, the demodulation reference signal being used to demodulate the The data of the second user equipment. In a first possible implementation manner, the receiver is further configured to: receive a precoding indication sent by the first device, according to the sixth aspect;

The processor is further configured to perform user data demodulation according to the demodulation reference signal and the precoding information;

In a second possible implementation, in combination with the sixth aspect or the first possible implementation, the receiver is further configured to:

In the method for transmitting a demodulation reference signal according to an embodiment of the present invention, the first device determines a location of transmitting a demodulation reference signal in a physical resource block, and sends configuration information to the second user equipment to indicate that the demodulation reference signal is in the foregoing physical The location in the resource block. The location of the transmit demodulation reference signal includes a mapped location of the channel state information reference signal CSI-RS that has been used by the first device and/or is not used, therefore, since the first device is defined in the existing LTE system version Rel-10 The demodulation reference signal is transmitted at the mapping position of the CSI-RS in the above physical resource block, and therefore, downlink user data demodulation of more users can be supported. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are Some embodiments of the invention may be obtained by those of ordinary skill in the art in view of the drawings without additional inventive labor.

1 is a reference signal of a normal cyclic prefix of LTE Rel-10 in a pair of physical resource blocks 2 is a flowchart of a method for transmitting a demodulation reference signal according to Embodiment 1 of the present invention; FIG. 3 is a flowchart of a method for transmitting a demodulation reference signal according to Embodiment 2 of the present invention; A flowchart of interaction between a first device and a second user device according to Embodiment 3 of the present invention;

5 is a resource map of a CSI-RS of a 4-antenna port in a PRB pair under the normal cyclic prefix of LTE Rel-10;

6 is a resource map of a CSI-RS of a two-antenna port of two configurations in a normal cyclic prefix of LTE Rel-10 in a PRB pair;

7 is a resource map of a CSI-RS of an 8-antenna port in a PRB pair under the normal cyclic prefix of LTE Rel-10;

8 is a resource map of a MU-MIM0 when a second user equipment is spatially multiplexed with a first user equipment;

FIG. 9 is a flow chart of interaction between a first device and a second user device according to Embodiment 4 of the present invention;

10 is a resource map of MU-MIM0 when two second user equipments perform space division multiplexing in a PRB pair under a normal cyclic prefix;

11 is a resource map of MU-MIMO when four second user equipments perform space division multiplexing in a PRB pair under a normal cyclic prefix;

12 is a rate matching diagram of MU-MIMO when four second user equipments perform space division multiplexing in a PRB pair under a normal cyclic prefix;

FIG. 13 is a flow chart of interaction between a first device and a first user device according to Embodiment 5 of the present invention;

FIG. 14 is a schematic structural diagram of a first device according to Embodiment 6 of the present invention; FIG.

FIG. 15 is a schematic structural diagram of a first device according to Embodiment 7;

16 is a schematic structural diagram of a second device according to Embodiment 8;

FIG. 17 is a schematic structural diagram of a second device according to Embodiment 9;

FIG. 18 is a schematic structural diagram of a first device according to Embodiment 10;

FIG. 19 is a schematic structural diagram of a second device according to Embodiment 11 of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a resource map of a reference signal of a normal cyclic prefix of LTE Rel-10 in a pair of physical resource blocks. In a wideband system, especially an OFDM system, the partitioning of resource blocks is performed in both the time domain and the frequency domain. Referring to the description of resource blocks in the physical layer protocol of LTE, a physical resource block (PRB) corresponds to a time slot of 180 kHz in the frequency domain and a time slot of the time domain, that is, 0.5 milliseconds. Under the normal cyclic prefix, one slot can transmit 7 consecutive OFDM symbols, and one PRB represents 7 consecutive OFDM symbols in the time domain and 12 consecutive subcarriers in the frequency domain, so one PRB consists of 7 * 12 resource elements (Resource Element, referred to as RE). A PRB pair consists of two PRBs, which occupy 14*12 REs. As shown in Fig. 1, the PRB in the figure is composed of small squares of REs of different patterns, and two groups of 0, 1, 2, ..., 6 along the X-axis direction respectively indicate the first time slot and the second time. The 7 OFDM symbols of the slot, 0, 1, 2, ..., numbered along the y-axis direction, represent 12 consecutive subcarriers in the frequency domain.

Specifically, in FIG. 1, a PRB pair may be jointly occupied by a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Share Channel (PDSCH). The PDCCH is used for transmitting the control information, and occupies the first three OFDM symbols of the first time slot and 12 consecutive subcarriers in the frequency domain, that is, 3*12 REs; the PDSCH is used to transmit user equipment (User Equipment, UE for short) The data of the PRB is occupied by the rest of the PRBs. The demodulation reference signal in the present invention is transmitted in the PDSCH for demodulating the user data transmitted on the PDSCH. The following focuses on the reference signals in a PRB pair. The reference signal mainly includes a Common Reference Signal (CRS), a Channel State Information-Reference Signal (CSI-RS), and a Downlink Modulation-Reference Signal (DM-referred to as DM-). RS), the resource occupied position of the antenna port for transmitting CRS in one PRB pair is represented by horizontal stripe RE, the available resource positions of all CSI-RSs are represented by cross stripes RE, and the available resource positions of all DM-RSs are positive 45 ° The diagonal line RE indicates that other REs are used to transmit public control Signaling or user data.

Specifically, the existing LTE Rel-10 has a total of eight antenna ports configured for the CSI-RS, and a possible mapping position of all CSI-RSs on one PRB pair, that is, all the cross-strip REs in FIG. 1 , 40 in total; The available resource locations of all DM-RSs are 24 REs, and since each DM-RS port corresponds to 12 REs in the available resource locations of the DM-RS, every four DM-RSs occupy the same RE position orthogonally, thus The 24 REs correspond to 8 DM-RS antenna ports for transmitting DM-RS, so the prior art supports data demodulation of up to 8 data streams.

Further, the CSI-RS can be transmitted using 1, 2, 4 or 8 antenna ports. CSI-RS has a variety of different location mapping methods for each antenna port number. Table 1 shows the indication of the location mapping of CSI-RS for different antenna port numbers under different subframe configurations of a regular cyclic prefix. Table 2 shows the subframe configuration of the CSI-RS. Table 1 shows the location mapping of CSI-RS in physical resource blocks by the number and location of CSI-RS configurations on different antenna ports. Table 2 uses CSI-RS subframe configuration, CSI-RS transmission period and CSI- The subframe offset amount of the RS indicates the subframe number of the CSI-RS to be transmitted.

Table 1

Table 2

Specifically, in Table 1, the variable that calculates the mapping position of the CSI-RS on a PRB pair may be calculated by using the sequence number of the OFDM symbol in which the RE is located, and the sequence number of the subcarrier in which the RE is located may be Calculated as the time slot number of the current CSI-RS, which is 0 or 1; frame structure 1 refers to the Time Division Duplexing (TDD) frame structure of LTE, and frame structure 2 refers to Frequency Division Duplexing (FDD) frame structure of LTE; CSI-RS configuration number indicates different CSI-RS location mapping modes, 20 configurations for frame structure 1 and 32 configurations for frame structure 2 The number of antenna port configurations of the CSI-RS indicates the number of antenna ports that send CSI-RS, which can be 1, 2, 4 or 8.

Further, Table 2 shows the subframe configuration / _esi - _RS of the CSI-RS, the transmission period r _esi _ _{RS of the} CSI-RS, and the subframe offset A _csi _ _{rs of the} CSI-RS. The unit of the transmission period ^ is 1 subframe, that is, 1 millisecond. Specifically, the sending period of the CSI-RS indicates an interval between the subframe numbers of the CSI-RS, and the value of the CSI-RS subframe offset is determined by the subframe configuration of the CSI-RS, and is used to indicate the CSI-RS. The starting transmission subframe number. It can be seen from Table 2 that the number of values of the subframe configuration of the CSI-RS and the subframe offset of the CSI-RS are the same under the premise that the transmission period of the CSI-RS is determined. For example, if the CSI-RS transmission period is configured to be 5 milliseconds, the CSI-RS subframe configuration and the CSI-RS subframe offset can be configured as any integer value from 0 to 4, if the CSI-RS is to be used. If the subframe configuration is set to 0, the value of the CSI-RS subframe offset is also 0. In this configuration, the CSI-RS will be in the subframe with the subframe number 0, 5, 10... Sending, that is, sending every 5 subframes; similarly, if the subframe configuration of the CSI-RS is set to 1, it means that the CSI-RS is sent on the subframe with the subframe number 1, 6, 11, ... Similarly, if the CSI-RS transmission period is configured to 10 milliseconds, the CSI-RS subframe configuration can be configured as 5~14. If the subframe configuration of the CSI-RS is set to 5, the value of the CSI-RS subframe offset is 0. In this configuration, the CSI-RS will have a subframe number of 0. The transmission is performed on the subframes of 10, 20 ······, that is, every 10 subframes are sent once, and the rest of the configurations are similar, and are not described here.

Further, it can be seen from Table 1 that the CSI-RS transmitted by the 1 antenna port and the 2 antenna port can have 20 or 32 different position mapping modes, and the CSI-RS in each position mapping mode is in one PRB. The CSI-RS sent by the 4 antenna ports can have 10 different location mapping modes. The CSI-RS in each location mapping mode occupies 4 REs on one PRB pair; 8 antenna ports send The CSI-RS can have five different location mapping modes, and the CSI-RS in each location mapping mode occupies 8 REs on one PRB pair. In actual use, the time and frequency position at which the CSI-RS is transmitted can be indicated according to Table 1 and Table 2.

In addition, in the existing protocol, the base station can configure the UE with zero-power CSI-RS or non-zero-power CSI-RS. Specifically, the base station may send zero-power CSI-RS signaling to indicate a zero-power CSI-RS for the UE, so that the UE may perform interference on the CSI-RS mapping position indicated by the zero-power CSI-RS signaling. The base station may also indicate non-zero-power CSI-RS for the UE by sending non-zero-power CSI-RS signaling to enable the UE to map the CSI-RS indicated by the non-zero-power CSI-RS signaling. Channel State Information (CSI) measurement is performed on the channel state information. The above two types of signaling have the same structure, and are all used to indicate the mapping location of the CSI-RS, which are collectively referred to as CSI-RS configuration information.

It should be noted that the solutions in the embodiments of the present invention are all performed in units of PRBs, and are also applicable to mapping manners in units of PRB pairs. In order to more clearly describe the relationship between the PRB pair and other signals, the solution of the embodiment of the present invention is more clearly described. The resource mapping pattern in the subsequent embodiments of the present specification is based on the PRB pair in FIG. of. FIG. 2 is a flowchart of a method for transmitting a demodulation reference signal according to Embodiment 1 of the present invention. As shown in FIG. 2, the method for transmitting a demodulation reference signal in this embodiment may include the following steps: Step S100: The first device determines a location of transmitting a demodulation reference signal in a physical resource block, and sends a demodulation reference signal. The location includes a mapped location of the CSI-RS that has been used by the first device and/or is unused, and the demodulation reference signal is used to demodulate data of the second user equipment.

Step S101: The first device sends configuration information to the second user equipment, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block. Step S102: The first device sends a demodulation reference signal at a location where the demodulation reference signal is sent in the physical resource block.

The executor of each step in this embodiment is a first device. In practice, the first device may be a network device, such as a base station, a relay node, or a UE having an inter-UE communication function. When the first device is a base station, correspondingly, the demodulation reference signal is sent to the second user equipment by the base station, and the demodulation reference signal used for data demodulation of the second user equipment may be called a downlink demodulation reference signal. When the first device is a user equipment (User Equipment, UE for short), the demodulation reference signal is still used for data demodulation of the second user equipment, but there is no uplink or downlink.

Since the prior art implements user data demodulation with DM-RS, and the available DM-RS has limited resource locations, as shown in FIG. 1, the existing DM-RS cannot simultaneously support data of more than 8 data streams. Demodulation, if each data stream corresponds to one user, that is, the prior art supports up to 8 users at the same time.

In this embodiment, the first device may not send the demodulation reference signal at the location of the DM-RS, but use the available resource location of the CSI-RS as shown in FIG. 1 as the location for transmitting the demodulation reference signal, thereby realizing More user data demodulation. Specifically, the location of the above-mentioned transmit demodulation reference signal includes a mapped position that has been used, is not used, and has been used with any of the unused CSI-RSs.

As a possible implementation, the first device may determine to transmit a demodulation reference signal at a mapped location of the CSI-RS that it has used. That is, the first device may determine to transmit a demodulation reference signal to the second user equipment with the mapping location of the CSI-RS that has been used to transmit the first user equipment. It should be noted that the first user equipment here, hereinafter referred to as the first UE, represents the UE corresponding to the old version of LTE, the second user equipment, hereinafter referred to as the second UE, is the UE corresponding to the new version of LTE, and the old version of LTE refers to This application introduces the previous version of the LTE protocol. The new version of LTE is the LTE version introduced in this application. Generally, if the method of the present invention is introduced in Rel-n, the old version is the version before LTE Rel-n, the new version. Refers to LTE Rel-n. Unless otherwise stated, the second UE, the first UE, the new LTE version, and the old LTE version described below all follow the definition herein.

As another possible implementation manner, the first device may determine to transmit a demodulation reference signal at a mapped position of its unused CSI-RS. That is, the first device may subtract the mapping position of the CSI-RS that has been used to transmit the first UE with the mapping position of all available CSI-RSs, and then determine to transmit the demodulation with the mapping position of the remaining CSI-RSs. Reference signal.

As another feasible implementation manner, the first device may also adopt the foregoing two implementation manners. The combination is used to determine the location at which the demodulation reference signal is transmitted. That is, the first device may determine that the demodulation reference signal is sent to the second UE by using the mapping location of the CSI-RS that has been used to transmit the first UE, and may be subtracted from the mapping position of all available CSI-RSs. The mapped position of the CSI-RS that has been used to transmit the first UE, and then determines to transmit the demodulation reference signal with the mapped position of the remaining CSI-RS.

It should be noted that the foregoing three feasible implementation manners only limit that the location where the first device sends the demodulation reference signal does not exceed that that has been used by the first device, or is not used, or has been used with an unused CSI-RS. Mapping position, how to map the above demodulation reference signal to the already used, or unused, or the mapping position of the unused CSI-RS has been used, that is, specifically to FIG. 1, if The mapping location of the CSI-RS that the first device can use (including the mapping location where the unused CSI-RS has been used) is the resource location composed of all the cross stripes RE, then the first device sends the above solution on one PRB pair. The position of the reference signal does not exceed the resource position of all the cross stripes RE in FIG.

Further, the demodulation reference signal may be a CSI-RS, or may be a first DM-RS or a second DM-RS. Specifically, the CSI-RS is a reference signal used in the prior art to perform a channel state information (CSI) measurement operation; the first DM-RS is a pre-coded solution for performing data demodulation. To adjust the reference signal, in terms of resource mapping manner, it is mapped to the location of the above-mentioned transmit demodulation reference signal in the physical resource block according to the mapping manner of the CSI-RS; the second DM-RS is precoded for Demodulation reference signal for data demodulation, in terms of resource mapping manner, it maps the DM-RS at the position where the demodulation reference signal is transmitted in the physical resource block according to a preset mapping manner, where the preset mapping is performed. The mode may be any preset manner different from the mapping mode of the CSI-RS.

It should be noted that the first DM-RS and the second DM-RS are different from the DM-RS in the prior art, that is, the DM-RS on the positive 45° diagonal line RE in FIG. 1, and the difference here is only They are said to have different mapping positions in a PRB pair, but the specific sequence generation method is not limited, and may be the same as or different from the existing DM-RS, or may be the same as or different from the existing CSI-RS. Specifically, the first DM-RS and the second DM-RS are not mapped on the positive 45 ° diagonal line RE, but are mapped on the resource locations composed of the cross stripes RE.

After the first device determines that the location of the demodulation reference signal is sent in the physical resource block, in order to ensure that the second UE can perform data demodulation by using the demodulation reference signal, the first device may send the second UE to the second UE. The configuration information is used to indicate the location of the demodulation reference signal in the physical resource block.

After the first device determines the location of transmitting the demodulation reference signal and sends the configuration information, the demodulation reference signal may be sent at the location of the physical resource block in which the demodulation reference signal is transmitted. Since the configuration information is sent by the first device, the second UE may receive the demodulation reference signal at the location of the foregoing demodulation reference signal in the physical resource block according to the configuration information, thereby completing data demodulation.

It should be noted that the order of execution of the above three steps is not specifically limited. In practice, the order of execution of the three steps can be flexibly adjusted as needed.

In addition, the number of second UEs is not limited here, that is, the demodulation reference signal can be used for data demodulation of at least one second UE, that is, the first device only needs to guarantee the solution sent to multiple second UEs. The location set of the reference signal does not exceed the location of the transmit demodulation reference signal, and the respective demodulation reference signals may be sent to the at least one second UE in the same physical resource block, so that the at least one second UE can be used. The same block of time domain and frequency domain resources, and complete their respective data demodulation according to their respective demodulation reference signals.

In the method for transmitting a demodulation reference signal in the foregoing embodiment, the first device determines a location of transmitting a demodulation reference signal in a physical resource block, where the location of the demodulation reference signal includes that the first device has been used, or is not used. Or mapping location of the unused CSI-RS that has been used, and transmitting configuration information to the second UE to indicate the location of the demodulation reference signal in the foregoing physical resource block, so that the second UE can be based on the received solution The reference signal is adjusted for data demodulation. Since the first set of alternate locations for transmitting the demodulation reference signal transmits the demodulation reference signal, more user data demodulation can be supported. FIG. 3 is a flowchart of a method for transmitting a demodulation reference signal according to Embodiment 2 of the present invention. As shown in FIG. 3, the method for transmitting a demodulation reference signal in this embodiment may include the following steps: Step S200: The second UE receives configuration information sent by the first device, where the configuration information is used to indicate that the demodulation reference signal is The location in the physical resource block.

Step S201: The second UE receives, at a location indicated by the configuration information in the physical resource block, a demodulation reference signal sent by the first device, where the location indicated by the configuration information includes a CSI-RS that has been used by the first device and/or is not used. The mapping position, the demodulation reference signal is used to demodulate the data of the second user equipment.

The executor of each step in this embodiment is a second UE. In practice, the second UE may be UE corresponding to the new version of LTE.

After the first device sends the configuration information and the demodulation reference signal to the second UE, the second UE needs to receive the configuration information and the demodulation reference signal.

The second UE may determine a location of the demodulation reference signal in the physical resource block according to the received configuration information, and receive the demodulation reference signal at a location indicated by the configuration information.

In the transmission method of the demodulation reference signal of the above embodiment, the second UE receives the demodulation reference signal at the position indicated by the configuration information in the physical resource block according to the configuration information, thereby performing data demodulation according to the demodulation reference signal. Since the demodulation reference signal of the second UE is used at the mapping position of the unused CSI-RS that has been used by the first device, or is not used, the data demodulation of more users can be implemented. . FIG. 4 is a flow chart of interaction between a first device and a second user device according to Embodiment 3 of the present invention. In this embodiment, the specific interaction process between the first device and the second user equipment, that is, the second UE, when the demodulation reference signal sent by the first device is the CSI-RS or the first DM-RS is described in detail. As shown in FIG. 4, the method for transmitting a demodulation reference signal in this embodiment may include the following steps:

Step S300: The first device determines, where the CSI-RS or the first DM-RS is sent in the physical resource block.

The executor of this step is the first device. In practice, the first device may be a network device, such as a base station, a relay node, or a UE having a communication function between UEs.

Specifically, the first device may determine a location for transmitting the CSI-RS or the first DM-RS. The location where the CSI-RS or the first DM-RS is transmitted includes the mapped location that has been used, or is not used, or has been used with the unused CSI-RS. The mapping position of the above CSI-RS is a set of locations of all REs for placing CSI-RS in the physical resource block defined in the Long Term Evolution LTE system version Rel-10. Specific to Figure 1, it is the resource location composed of all cross stripes RE.

As a first case, when the location of the CSI-RS or the first DM-RS is the CSI-RS mapping location that the first device has used, the first device determines to send the CSI-RS or the first DM to the second UE. The location of the -RS is the same as the mapping location of the CSI-RS sent to the first UE. Specifically, as a feasible implementation manner, the first device may send the CSI-RS as the demodulation reference signal of the second UE. Since the transmission of the CSI-RS is full bandwidth, the second UE may also receive the CSI-RS sent by the first device to the first UE, that is, the mapping position of the first device at the CSI-RS at this time. The demodulation reference signal sent to the second UE is the CSI-RS transmitted to the first UE at the mapping position of the CSI-RS. As another possible implementation manner, the first device may send the first DM-RS as the demodulation reference signal of the second UE. That is, the first device may send the first DM-RS on the mapping location of the CSI-RS of the first UE. Of course, since the mapping location of the CSI-RS is already used to place the CSI-RS of the first UE, The first DM-RS is sent to the second UE at the same location, which may cause interference. Therefore, this implementation can be used as a sub-optimal solution. In general, in this case, the first device does not need to configure a mapping location of the new CSI-RS for the second UE, and does not need to send a new CSI-RS for the second UE, but only needs to notify the second The UE can perform data demodulation on the mapping position of the CSI-RS of the existing device.

As a second case, when the location of the CSI-RS or the first DM-RS is the mapping location of the CSI-RS that is not used by the first device, the first device determines to send the location of the demodulation reference signal to the second UE. The mapping position of the remaining CSI-RSs after the mapping position of all available CSI-RSs of the first device is subtracted from the mapping position of the CSI-RS that has been used to transmit the first UE. Specifically, as a feasible implementation manner, the first device may send the CSI-RS as the demodulation reference signal of the second UE. . Since the first device does not use the above CSI-RS mapping location at this time, the first device may send the CSI-RS as an demodulation reference signal at the unused CSI-RS mapping location. Different from the case where the first device transmits the CSI-RS as the demodulation reference signal at the mapping position of the CSI-RS that has been used, the first device does not reuse the mapping position of the used CSI-RS, but uses The mapping position of the new CSI-RS transmits a demodulation reference signal, that is, the first device needs to configure a CSI-RS resource other than the CSI-RS of the first UE for the second UE as a demodulation reference signal. As another feasible implementation, the first device may send the first DM-RS as the demodulation reference signal of the second UE. The situation at this time is similar to the case of the first implementation of this paragraph, except that the sequence generation method of the first DM-RS may be different from the CSI-RS.

As a third case, when the location of the foregoing CSI-RS or the first DM-RS is that the first device has used the mapping location of the unused CSI-RS, the first device determines to send a demodulation reference to the second UE. The location of the signal is the sum of the mapped locations of the CSI-RS that the first device has used plus unused. Specifically, when the location of the CSI-RS or the first DM-RS is the mapping location of the used CSI-RS, the specific implementation manner is the same as the description of the foregoing first case, when the foregoing CSI-RS or When the location of the first DM-RS is the mapping location of the unused CSI-RS, the specific implementation manner is the same as that in the previous case, and details are not described herein again. It should be noted that, since the CSI-RS is used for channel state information (CSI) measurement, the first device does not pre-code the CSI-RS when transmitting the CSI-RS. Therefore, when the solution is When the reference signal is a CSI-RS, the first device further needs to send precoding indication information to the second UE, so that the second UE can perform data demodulation according to the CSI-RS and the precoding information. Since the first DM-RS is also not precoded, as in the case of the CSI-RS, precoding indication information needs to be transmitted for the second UE.

In addition, in the existing LTE Rel-10, the CSI-RS is transmitted to the existing UE by using the full bandwidth. In the foregoing solution, when the demodulation reference signal is a CSI-RS, the first device may determine the full bandwidth or The CSI-RS is transmitted on the dedicated bandwidth of the second UE. Similarly, the first device may also determine to transmit the first DM-RS on the full bandwidth or on the dedicated bandwidth of the second UE. That is to say, the transmission bandwidth of the above demodulation reference signal is not limited herein.

Step S301: The first device sends configuration information to the second UE, where the configuration information is used to indicate a location of the CSI-RS or the first DM-RS in the physical resource block.

Specifically, after the first device determines to send the CSI-RS or the location of the first DM-RS in the physical resource block, the first information needs to be sent to the second UE to indicate that the CSI-RS or the first DM-RS is in the physical resource. The position in the block.

Further, from the definition of the first DM-RS, the first DM-RS is also mapped to the physical resource block according to the mapping manner of the CSI-RS. Therefore, the first device can be defined in the LTE Rel-10. The non-zero power CSI-RS signaling is used as configuration information to notify the second UE of the location of the demodulation reference signal in the physical resource block.

The non-zero-power CSI-RS signaling is sent by the base station to the UE for indicating the location of the CSI-RS in the physical resource block. Specifically, the non-zero-power CSI-RS signaling includes the following parameters in Table 1 and Table 2: CSI-RS configuration number, CSI-RS antenna port configuration number, CSI-RS subframe configuration, CSI - The transmission period of the RS and the subframe offset of the CSI-RS. Through the above several parameters, the first device can indicate the location of the demodulation reference signal in the physical resource block for the second UE.

Specifically, for the first DM-RS, the foregoing non-zero power CSI-RS signaling further includes a power on each RE of the PDSCH and each of the locations of the foregoing CSI-RS or the first DM-RS. The ratio of the Energy Per Resource Element (EPRE) pC, the unit of the ratio is decibel (dB). For example, if pC = -3, it means that the power on the PDSCH signal is 1/2 of the power of the signal at the position of the above-mentioned CSI-RS or the first DM-RS.

Optionally, the first device may be configured to be in the downlink control information (Downlink Control Information, DCI for short), and then sent to the second UE, to indicate that the CSI-RS or the first DM-RS is in the physical resource. The position in the block. Of course, the first device may also use the Radio Resource Control (RRC) signaling to indicate to the second UE, in view of the fact that the CSI-RS signaling of the non-zero power corresponds to more signaling words. When indicating, the first device needs to explicitly specify that the mapping location of the CSI-RS indicated by the non-zero power CSI-RS signaling is used for data demodulation of the second UE.

Step S302: The first device sends a precoding indication to the second UE.

Specifically, since the CSI-RS or the first DM-RS is not pre-coded, the data sent by the first device to the second UE is pre-coded data. Therefore, in order to perform data solution for the second UE. The first device further needs to send a precoding indication to the second UE, where the precoding indicates precoding information for indicating user data of the second UE, so that the second UE can be according to the CSI-RS or the first DM- RS, and the above precoding information for data demodulation.

Optionally, according to the existing LTE Rel-10 protocol for user data precoding, the first device needs to use at least two signaling words to indicate the foregoing precoding information, and one signaling word is a transmit precoding matrix indication (Transmitted) Precoding Matrix Indicator (TPMI), another signaling word is the PMI acknowledgment signal word. Specifically, the first device may use the TPMI to indicate which codeword in the codebook specified in the LTE Rel-8 and subsequent evolved protocols is used on the bandwidth for transmitting the CSI-RS or the first DM-RS; The signaling is used to indicate which precoded codeword is used for the data sent to the second UE.

Specifically, the number of bits in the TPMI is not less than the number of codewords in the codebook corresponding to the number of antenna ports in which the data of the second UE is sent by the first device, for example, there are 4 codewords in the codebook corresponding to the 2 antenna ports, so TPMI The minimum can be 2 bits; 4 antenna ports have 16 code words in the codebook, so the TPMI can be 4 bits minimum; 8 antenna ports have 64 code words in the codebook, so the TPMI can be 8 bits minimum; When there are more antenna ports to send data, such as 32 antenna ports, then TPMI The number of bits should be not less than the number of codewords in the codebook corresponding to the 32 antenna ports. For example, the TPMI can be a minimum of 32 bits.

Further, the number of bits of the PMI acknowledgment signal is not particularly limited as long as it can indicate which precoded codeword is used for the data transmitted to the second UE. For example, PMI acknowledgment signaling can be represented by 1 bit. If its value is 0, it means that the codeword indicated by TPMI is used for precoding; if its value is 1, it means that the last pass is used. The non-periodic CSI reports the PMI value of the first device. For different systems, the most recent aperiodic CSI reporting interval value is different. The FDD system is 4 milliseconds and the TDD system has a minimum interval of 4 milliseconds. In addition, the uplink and downlink configuration ratios are different, and the above interval values are also different. The specific values may be performed in accordance with the LTE protocol TDD related regulations.

In a specific implementation, the foregoing signaling word may be sent to the second UE by the first device as part of a certain signaling. Since the TPMI and PMI acknowledgment signal words are used for data demodulation, the TPMI and PMI acknowledgment signal words should be indicated by fast signaling. In LTE, this fast signaling can be DCI. In order to implement the above indication, a new DCI needs to be designed to carry the above precoding indication therein. It should be noted that the new DCI must include at least two signaling words, TPMI and PMI acknowledgement. Of course, RRC signaling can also be used to indicate the TPMI and the PMI confirmation message. It should be noted that step S302 is performed only when the first device does not precode the data, that is, if the first device The data is pre-coded, and the second UE can directly perform data demodulation by using the demodulation reference signal sent by the first device. The demodulation reference signal at this time may be the second DM-RS. In the following embodiments, This situation is described in detail.

Step S303: The first device sends the first indication information to the second UE.

Specifically, when the second UE multiplexes the same physical resource block with other devices, that is, not only the demodulation reference signal and data of the second UE but also the demodulation reference signal of the other device are on the same physical resource block. When the data is used, the first device needs to send the first indication information to the second UE. It should be noted that other devices herein may be the first UE defined in the foregoing or the remaining second UE.

Further, the first indication information is used to indicate that the second UE performs the rate in the physical resource block. Match or interfere with the location of the measurement. That is, the second UE may perform rate matching or interference measurement operations according to the location indicated by the first indication information. In practice, specifically whether to perform rate matching or interference measurement at the location is determined by the first device scheduling.

Further, if the physical resource block includes at least one location where the first UE sends the DM-RS, that is, at least one of the first UE and the second UE share the same physical resource block. The location indicated by the indication information needs to include the location of the DM-RS of all the first UEs in the physical resource block. The second UE needs to perform rate matching or interference measurement on the location of the DM-RS of all the first UEs indicated by the first indication information.

Further, since the CSI-RS or the first DM-RS may be used to demodulate data of two or more second UEs, if the physical resource block includes at least one demodulation reference signal of the second UE, In the case of data, the location indicated by the first indication information needs to include the location of the demodulation reference signal sent to the second UE of the two or more second UEs other than the second UE on the physical resource block, that is, the second UE needs Rate matching or interference measurement is performed at the position of the demodulation reference signal of the remaining second UEs indicated by the first indication information.

Specifically, when the demodulation reference signal is a CSI-RS or a first DM-RS, the first indication information may be zero-power CSI-RS signaling in the existing protocol. In practice, the upper RRC signaling informs the UE that the current CSI-RS configuration information is specifically which of the two. It should be noted that the sequence of steps S301, S302, and S303 is not limited herein, that is, in practice, the order of execution of the three may be flexibly adjusted. In addition, the foregoing configuration information, the first indication information, and the second indication information may be sent by one signaling, or may be divided into two or three signaling.

Step S304: The first device sends a CSI-RS in a location where the CSI-RS is sent in the physical resource block, or the first device sends the first DM-RS in a location where the first DM-RS is sent in the physical resource block.

Specifically, after the first device determines the location of the CSI-RS or the first DM-RS that is sent to the second UE, and sends the relevant signaling to the second UE, the CSI-RS or the CSI-RS may be sent to the second UE. The first DM-RS.

It should be noted that, in general, since the CSI-RS or the first DM-RS is used for data demodulation, the first device may send a CSI-RS or a first DM-RS. , but here only the steps S300 and S304 need to be performed sequentially, as for signaling and CSI-RS or first The order in which DM-RSs are sent is not strictly limited.

In addition, optionally, the first device may further send third indication signaling to the base station, where the base station refers to a device that has a base station transmitting function, and does not specifically refer to an existing base station. Specifically, the foregoing third indication signaling is used to indicate a CSI-RS of the second UE or a location of the first DM-RS in the physical resource block, so that the base station reserves the CSI-RS or the first DM of the second UE. The location of the RS in the physical resource block. For example, in order to limit and reduce co-channel interference between multiple cells, the first device may send information about a CSI-RS sent by the second UE or a resource location occupied by the first DM-RS to a neighboring cell or The transmitter, that is, the base station, allows the neighboring cell or transmitter to vacate the corresponding resource location to protect the CSI-RS or the first DM-RS transmitted by the first device.

Step S305: The second UE receives configuration information sent by the first device.

The executor of each step in this embodiment is the second UE. In practice, the second UE may be the UE corresponding to the new LTE version.

Specifically, the first device needs to receive the configuration information, and the second UE needs to receive the configuration information, and determine, according to the configuration information, a location of the CSI-RS or the first DM-RS in the physical resource block.

Step S306: The second UE receives the precoding indication sent by the first device.

Specifically, the first UE needs to receive the precoding indication to the second _UE , and therefore, the second UE needs to receive the precoding indication, and acquire precoding information of the data of the second UE according to the precoding indication.

Step S307: The second UE receives the first indication information sent by the first device.

Specifically, the first device sends the first indication information to the second UE, so the second UE needs to receive the first indication information, and performs rate matching according to the location in the physical resource block indicated by the first indication information. Or interfere with the measurement.

In practice, the foregoing first indication information may be carried by zero-power CSI-RS signaling. Step S308: The second UE performs rate matching or interference measurement according to the location in the physical resource block indicated by the first indication information. The executor of each step in this embodiment is the second UE. In practice, the second UE may be the UE corresponding to the new LTE version.

Specifically, after receiving the first indication information, the second UE may perform rate matching or interference measurement according to the location in the physical resource block indicated by the signaling.

It should be noted that, similar to the sequence of steps S301, S302, and S303, the sequence of steps S306, S307, and S308 is not limited herein. The order in which the second UE performs the above three steps may or may not correspond to the order of the first device. In practice, the transmission of the first device and the reception sequence of the second UE may be flexibly adjusted as needed.

Step S309: The second UE receives the CSI-RS sent by the first device in the location where the CSI-RS is sent in the physical resource block, or the second UE sends the first device in the location where the first DM-RS is sent in the physical resource block. The first DM-RS sent.

Specifically, the first device needs to receive the CSI-RS or the first DM-RS by sending the CSI-RS or the first DM-RS to the second UE. Specifically, the second UE needs to receive the CSI-RS or the first DM-RS in the location of the CSI-RS indicated by the configuration information or the location of the first DM-RS in the physical resource block.

Step S310: The second UE performs user data demodulation according to the CSI-RS or the first DM-RS and the precoding information.

The executor of each step in this embodiment is the second UE. In practice, the second UE may be

The UE corresponding to the new version of LTE.

Specifically, since the demodulation reference signal sent by the first device to the second UE is a CSI-RS or a first DM-RS, that is, a reference signal that is not precoded, the second UE needs to integrate the CSI-RS or The first DM-RS and the precoding information indicated by the precoding indication described above perform user data demodulation, that is, demodulation of data of the second UE.

It should be noted that, since the first device is a pre-transmitted CSI-RS or a first DM-RS, the second UE receives the signaling and then receives the CSI-RS or the first DM-RS. In practice, the order of sending the first device is not fixed. Therefore, the order of receiving the second UE is not strictly limited. In order to describe the solution more clearly, the resource occupancy map on the PRB pair in FIG. 1 is combined below. For example, how the first base station determines the location of transmitting the CSI-RS or the first DM-RS according to the location mapping manner of different CSI-RSs of Table 1, thereby flexibly supporting more user demodulation.

Figure 5 is a resource map of a CSI-RS of a 4-antenna port in a PRB pair under the normal cyclic prefix of LTE Rel-10. The representation of RE in the different patterns in Fig. 5 has the same meaning as in Fig. 1, and will not be described again here.

Specifically, the first device may send the demodulation reference signal, g卩 CSI-RS or the first DM-RS according to the CSI-RS mapping position shown in FIG. 5. As shown in Figure 5, the CSI-RS occupies 4 REs in a PRB pair, that is, the cross-strip RE in the figure. That is, the first device can send the CSI-RS or the CSI-RS at the location of the above four REs. The first DM-RS. The location of the above four REs may be a mapping location that has been used or not used by the first device or that has been used with an unused CSI-RS.

Further, the first device may notify the location of the four REs of the second UE by using non-zero power CSI-RS signaling. As shown in FIG. 5 , taking the CSI-RS configuration number and the number of transmitted antenna ports as an example, according to Table 1, the first device may configure the number of antenna ports for transmitting CSI-RS to 4, and configure the CSI-RS configuration number as 0, the position mapping mode of the CSI-RS of the above four antenna ports can be indicated. It should be noted that, in practice, the relevant parameters in Table 2 need to be configured to indicate the sequence number of the subframe in which the CSI-RS is transmitted, and the configuration manner is the same as that in Table 2. The following embodiment only briefly describes the CSI-RS configuration number configuration and the number of transmitted antenna ports when the CSI-RS is mapped in different locations in the physical resource block. The configuration of Table 2 will not be described again.

Further, since the number of REs occupied by the demodulation reference signal required for demodulating a data stream is different, that is, the number of REs required for data demodulation of one data stream is different, and therefore, the above 4 The four REs occupied by the CSI-RS of the antenna ports are allocated differently.

Specifically, if data demodulation of one data stream requires two REs corresponding to two CSI-RS antenna ports, that is, two REs, the first device can simultaneously support data demodulation of two data streams at the same time; if one data stream The data demodulation needs to average the number of REs corresponding to one CSI-RS antenna port, that is, one RE, and the first device of the first device can simultaneously support data demodulation of four data streams at the same time. In the following, the data demodulation of one data stream requires the number of REs corresponding to two CSI-RS antenna ports as an example. Specifically, the first device may determine how to allocate the two data streams according to the number of the second UEs that are actually supported and the number of data streams that each second UE needs. For example, the first device may support a second UE with a data stream number of 2 by using the foregoing four REs; the first device may also support two second UEs with two data streams of 1. It should be noted that the above four antenna ports are CSI-RS antenna ports used for transmitting CSI-RS, and are not limited herein between the antenna port that sends the CSI-RS from the first device and the physical antenna port of the first device. Mapping relations. In practice, when the first device is implemented, multiple physical antenna ports may be virtualized into one antenna port for transmitting CSI-RS. The virtual mode may be dynamically selecting one of multiple physical antenna ports, or generating a CSI-RS antenna port by precoding multiple physical antenna ports.

In addition, the first device may further determine, in the physical resource block, a location for transmitting the CSI-RS or the first DM-RS according to the channel state information of the second UE. That is, for the second UE in different environments, the first device may use other configured CSI-RSs different from the CSI-RS occupation position in FIG. 5 for transmitting the CSI-RS or the first DM-RS.

Specifically, since the four intersecting stripes RE given in FIG. 5 are grouped by every two immediately adjacent REs, the two sets of REs are located on the same OFDM symbol in the time domain, and therefore, FIG. 5 shows The location of the CSI-RS or the first DM-RS is relatively stable in time, and thus is more suitable for a scenario in which the frequency domain selectivity of the channel of the second UE is strong. Of course, the first device may also select another CSI-RS location mapping manner, so that the demodulation reference signals sent to the second UE can be staggered in the time domain and the frequency domain.

Figure 6 is a resource map of a CSI-RS of a two-antenna port of two configurations under the normal cyclic prefix of LTE Rel-10 in a PRB pair. The representation of RE in the different patterns in Fig. 6 has the same meaning as in Fig. 1, and will not be described here. As shown in FIG. 6, the difference from FIG. 5 is that the four cross stripes RE in FIG. 6 can correspond to the position mapping manner of the CSI-RS when the two 2-antenna ports in Table 1 are used.

Specifically, according to Table 1, the first device may configure the number of antenna ports for transmitting the CSI-RS to be 2, and configure the CSI-RS configuration number to be 0 and 19, thereby indicating the CSI-RS of the two 2-antenna ports. The location mapping method.

Further, when the first device transmits the CSI-RS or the first DM-RS according to the CSI-RS mapping position shown in FIG. 6, as described above with respect to FIG. 5, the data is demodulated according to each data stream. The number of REs required is different, and the first device can also support data demodulation of 2 or 4 data streams at the same time. As for how to allocate the above two data streams, the description is the same as that for FIG. 5, and details are not described herein again.

In addition, the first device may also send the CSI-RS or the first DM-RS at more CSI-RS mapping locations according to the number of data streams that need to be supported, as illustrated in conjunction with FIG. 7.

Figure 7 shows the CSI-RS of an 8-antenna port under the normal cyclic prefix of LTE Rel-10. A map of resources in a PRB pair. RE of the different patterns in Fig. 7 has the same meaning as Fig. 1, and will not be described again here. As shown in FIG. 7, at this time, the eight cross stripes RE in FIG. 7 can correspond to the position mapping manner of the CSI-RS when the two 4-antenna ports in Table 1 are used.

Specifically, according to Table 1, the first device may configure the number of antenna ports for transmitting the CSI-RS to be 4, and configure the CSI-RS configuration number to be 0 and 9, thereby indicating the CSI-RS of the two 4-antenna ports. The location mapping method.

Further, when the first device transmits the CSI-RS or the first DM-RS according to the CSI-RS mapping position shown in FIG. 7, the same, as described above with respect to FIG. 5, according to each data stream The number of REs required for data demodulation is different. The first device can simultaneously support data demodulation of 2 or 4 or 8 data streams at the same time. For example, the data demodulation of the first device that can support up to eight data streams at the same time is taken as an example. Specifically, the number of users, the number of second UEs that the first device can support according to actual needs, and the number of data streams required by each second UE. , determine how to allocate the above 8 data streams. For example, the first device can support a second UE with a data flow number of 8 by using the foregoing 8 REs; the first device can also support two second UEs with two data streams of 4. The first device can also support four. The second UE with 2 data streams.

It should be noted that, since the UEs in different bandwidths are transmitted in a frequency division multiplexing manner, when the first device sends the CSI-RS on the full bandwidth, the first device may be a UE located on different bandwidths. Configure the same CSI-RS for demodulation, or configure different CSI-RS for demodulation.

Of course, other various configurations can also be used, which are not enumerated here. Regardless of the method used, when the first device transmits the CSI-RS or the first DM-RS by using the CSI-RS mapping location, the configuration information, that is, the above step S301, is used to implement data demodulation. The configuration information of the CSI-RS is sent to the second UE, so that data demodulation of more data streams can be implemented, thereby supporting more UEs. There is more support here, including the data demodulation of the second UE implemented by CSI-RS on different bandwidths as described above, and the MU-MIMO of the second UE and the first UE. The following describes in detail how the first device implements MU-MIMO of the second UE and the first UE in conjunction with FIG. 8.

FIG. 8 is a resource map of a MU-MIMO when a second user equipment performs space division multiplexing with a first user equipment. RE of the different patterns in FIG. 8 has the same meaning as FIG. 1 and will not be described again here. It should be noted that the number of the first UE is not limited here, and the positive 45° diagonal line RE in the left figure in the figure and the negative 45° multiple diagonal line RE in the right figure are all the first UEs. Maximum The resource location of the DM-RS that can be occupied.

Specifically, the cross-strip RE in the left graph of FIG. 8 indicates the mapping positions of CSI-RSs used by the first UE, and these CSI-RSs may be CSI-RSs of non-zero power or CSI-RSs of zero power. The CSI-RS is not used in each of the first UEs, and the location mapping manner is the same as the prior art. In contrast, the cross-strip RE in the graph on the right side of FIG. 8 indicates the mapping position of the CSI-RS or the first DM-RS used by the second UE for data demodulation. It can be seen that in the same physical resource block, The two UEs do not need to use the DM-RS location of the existing device for data demodulation, but occupy the mapping position of the CSI-RS of the first UE, thus implementing MU-MIMO of the second UE and the first UE.

Further, in order to avoid interference with the first UE, the second UE needs to be in the existing device.

No data is sent on the port of the DM-RS, that is, the rate matching is performed, that is, the position of the DM-RS of the first UE indicated by the negative 45 ° multiple diagonal lines RE in the right figure of FIG. Certainly, the case where the first UE occupies all the available resources of the DM-RS is given. In practice, the second UE only needs to perform rate matching on the resource location of the DM-RS actually occupied by the existing device. In addition, the first device further needs to indicate to the second UE at which locations the rate matching is performed according to the description of step S303 above.

It should be noted that FIG. 8 does not limit the number of second UEs. As shown in FIG. 8 and FIG. 7 , the eight REs at this time may correspond to the CSI-RS location mapping manner of an 8-antenna port, and may also be The position mapping manner of the CSI-RS corresponding to the two 4-antenna ports is also as described above with respect to FIG. 5. According to the difference in the number of REs required for data demodulation of each data stream, the above-mentioned eight REs may be the largest. The data demodulation of two or four or eight data streams is supported at the same time, and the eight data streams are supported as an example. How to allocate the above eight data streams is the same as that described with reference to FIG. 7, and details are not described herein again. That is, the first device may configure a plurality of different second UEs to use different CSI-RSs to implement space division multiplexing with the MU-MIMO of the first UE on the same time-frequency resource.

It can be seen from FIG. 8 that the DM-RS of the first UE supports up to 8 data streams at the same time, and the second

The eight cross-strip REs occupied by the UE can also support up to eight data streams at the same time. Therefore, the first device can simultaneously support data demodulation of 16 data streams at the same time. Compared with the prior art, the space division multiplexing of the first device The MU-MIMO capability has doubled.

The method for transmitting the demodulation reference signal in the foregoing embodiment does not need to design a new DM-RS resource mapping manner for the second UE, and does not need to occupy the location of the DM-RS of the first UE, only by the Determining, by the device according to the actual channel condition of the second UE, that the demodulation reference signal is sent in a mapping position of the physical resource block that has been used by the first device, or is not used, or has been used and added to the unused CSI-RS, That is, the CSI-RS or the first DM-RS, and using the existing signaling to notify the location of the demodulation reference signal of the second UE, the second UE can complete the data demodulation, and therefore, without additional overhead. , Support data demodulation for more users. FIG. 9 is a flowchart of interaction between a first device and a second user device according to Embodiment 4 of the present invention. This embodiment details the specific interaction process between the first device and the second user equipment, that is, the second UE, when the demodulation reference signal sent by the first device is the second DM-RS. As shown in FIG. 9, the method for transmitting the demodulation reference signal in this embodiment may include the following steps:

Step S400: The first device determines a location of sending the second DM-RS in the physical resource block. The executor of this step is the first device. In practice, the first device may be a network device, such as a base station, a relay node, or a UE having a communication function between UEs.

Specifically, the first device may determine a location where the second DM-RS is sent. The location where the second DM-RS is transmitted includes the mapped location that has been used, or is not used, or has been used with the unused CSI-RS. The mapping position of the above CSI-RS is a set of locations of all REs for placing CSI-RS in the physical resource block defined in the Long Term Evolution LTE system version Rel-10. Specifically, Figure 1, which is the resource location of all the cross stripes RE.

As a first case, when the location where the second DM-RS is sent is a CSI-RS mapping location that has been used by the first device, the first device determines to send the location of the second DM-RS to the second UE and sends it to the first The mapping position of a UE's CSI-RS is the same. Specifically, the first device may send the second DM-RS on the mapping location of the CSI-RS of the first UE. Of course, because the mapping location of the CSI-RS is already used to place the CSI-RS of the first UE, The second DM-RS is sent to the second UE at the same location, which may cause interference. Therefore, this implementation can be used as a sub-optimal solution. In general, in this case, the first device does not need to configure the mapping location of the new CSI-RS for the second UE, but only needs to notify the second UE to do the mapping location of the CSI-RS of the existing device. Data demodulation is sufficient.

As a second case, when the location where the second DM-RS is sent is the mapping location of the CSI-RS that is not used by the first device, the first device determines that the location of sending the second DM-RS to the second UE is the first The mapping position of all available CSI-RSs of the device minus the CSI-RS that has been used to transmit the first UE After mapping the location, the remaining CSI-RS mapping locations. Specifically, since the first device does not use the location for sending the second DM-RS, the first device may send the second DM-RS as the demodulation reference signal in the unused CSI-RS mapping location. Different from the case where the first device transmits the DM-RS as the demodulation reference signal at the mapping position of the used CSI-RS, the first device does not reuse the mapping position of the used CSI-RS, but uses The mapping position of the new CSI-RS transmits a demodulation reference signal.

As a third case, when the location where the second DM-RS is sent is that the first device has used the mapping location of the unused CSI-RS, the first device determines to send the location of the second DM-RS to the second UE. The sum of the mapped locations of the unused CSI-RSs has been used for the first device. Specifically, when the locations of the foregoing second DM-RSs are respectively used, the specific implementation manner is the same as the description of the foregoing first case, when the locations of the foregoing second DM-RSs are respectively unused. The specific implementation manner is the same as that in the previous case, and details are not described herein again.

It should be noted that, unlike step S300, the foregoing second DM-RS is only transmitted at the location where the second DM-RS is sent, but the specific location mapping manner is different from the location mapping manner of the CSI-RS, and The second DM-RS is pre-coded by the first device. Therefore, the first device does not need to send the pre-coding indication information to the second UE, and the second UE may perform data demodulation according to the second DM-RS. In addition, the first device may not pre-code the second DM-RS, that is, the step S402 is not performed, and the other steps are the same as the second DM without pre-coding, except that S409 should be the same as step S310. -RS, of course, if the first device does not precode the second DM-RS, it needs to send a precoding indication before S404 as described in Embodiment 2, and receive the foregoing precoding indication after S405, the specific process The transmission and reception precoding indications are the same as those of the previous embodiment, and are not described herein again.

In actual use, the second DM-RS may be configured with different location mapping sets in advance. For example, the CSI-RS configuration manners in Table 1 and Table 2 may be used to determine the available location of the second DM-RS in advance. The device needs to indicate, for the second UE, the specific RE location of the second DM-RS and the location mapping set of the second DM-RS.

It should be noted that the bandwidth of the second DM-RS sent by the first device is not less than the bandwidth of the data of the second UE. The first device may select the RE of the corresponding density for the second DM-RS according to the actual channel condition of the second UE.

Step S401: The first device sends configuration information to the second UE, where the configuration information is used to indicate the second The location of the DM-RS in the physical resource block.

Specifically, after the first device determines that the location of the second DM-RS is sent in the physical resource block to send the demodulation reference signal to the second UE, the configuration information needs to be sent to the second UE to indicate that the second DM-RS is in the physical The location in the resource block.

Since the location mapping set of the second DM-RS is newly defined, new signaling needs to be designed as configuration information. For example, reference may be made to the design format of the non-zero power CSI-RS signaling in step S301, that is, the parameters shown in Table 1 and Table 2, the configuration number of the second DM-RS, and the number of antenna port configurations. And a subframe configuration, a transmission period, a subframe offset, and the like, to notify the second UE of the location of the demodulation reference signal in the physical resource block. Optionally, the first device may be configured to perform the downlink control information (Downlink Control Organization, DCI), and then send the information to the second UE to indicate the location of the demodulation reference signal in the physical resource block. Of course, the first device may also use the Radio Resource Control (RRC) signaling to indicate to the second UE, in the case of the indication, the first The device needs to explicitly specify that the mapping location of the CSI-RS indicated by the foregoing configuration information is used for data demodulation of the second UE.

It should be noted that, according to the description of step S201, for the first DM-RS, the first device needs to send a pC value for the second UE, except that for the second DM-RS, the ratio is The pC can be fixed by means of a protocol, so no additional signaling is required to indicate.

Step S402: The first device performs precoding on the second DM-RS.

Specifically, the first device may pre-code the second DM-RS, so that the second UE may perform data demodulation according to the second DM-RS. The precoding mode of the second DM-RS is the same as that of the DM-RS of the first UE in the prior art, and is not described here.

Step S403: The first device sends the first indication information to the second UE.

The detailed description of the step is the same as step S303, except that the second DM-RS is not The CSI-RS is mapped in the physical resource block according to the location mapping manner of the CSI-RS. Therefore, the first indication information here cannot be implemented by zero-power CSI-RS signaling. However, in practice, zero-power CSI may be borrowed. The format of the RS signaling is used to design the first indication information.

It should be noted that the sequence of steps S401, S402, and S403 is not limited herein, that is, in practice, the order of execution of the three may be flexibly adjusted.

Step S404: The first device sends a second DM-RS in a location where the second DM-RS is sent in the physical resource block.

Specifically, after the first device determines the location of the second DM-RS that is sent to the second UE, that is, the location of the second DM-RS, and sends the relevant signaling to the second UE, The two UEs send the second DM-RS.

It should be noted that, in general, since the second DM-RS is used for data demodulation, the first device may send the second DM-RS by sending signaling first, but only the step S400 is defined here. S404 needs to be executed one after another. As for the signaling and the transmission of the second DM-RS, it is not strictly limited.

In addition, optionally, the first device may further send third indication signaling to the base station, where the base station refers to a device that has a base station transmitting function, and does not specifically refer to an existing base station. Specifically, the foregoing third indication signaling is used to indicate a location of the second DM-RS of the second UE in the physical resource block, so that the base station reserves the location of the second DM-RS of the second UE in the physical resource block. . For example, in order to limit and reduce co-channel interference between multiple cells, the first device may send information about resource locations occupied by the second DM-RS of the second UE to the neighboring cell or transmitter, that is, the base station. So that the neighboring cell or the transmitter vacates the corresponding resource location to protect the second DM-RS sent by the first device.

Step S405: The second UE receives configuration information sent by the first device.

Step S406: The second UE receives the first indication information sent by the first device.

Step S407: The second UE performs rate matching or interference measurement according to the location in the physical resource block indicated by the first indication information.

Step S408: The second UE receives the second DM-RS sent by the first device in a location where the second DM-RS is sent in the physical resource block.

The above step S405 is the same as the description of step S305, and steps S406~S408 and the step S307-S309 are the same, except that the CSI-RS or the first DM-RS in step S305, S307-S309 needs to be replaced with the second DM-RS.

In addition, in practice, the foregoing first indication information may be carried by zero-power CSI-RS signaling. Step S409: The second UE performs user data demodulation according to the second DM-RS.

The UE corresponding to the new version of LTE.

Specifically, the demodulation reference signal of the second UE sent by the first device is a second DM-RS, which is a pre-coded reference signal. Therefore, the second UE may perform user data solution according to the second DM-RS. Tuning, that is, demodulation of data of the second UE.

It should also be noted that, since the first device is the first signaling to retransmit the second DM-RS, the second UE receives the signaling first and then receives the second DM-RS. In practice, the order of transmission of the first device is not fixed. Therefore, the order of receiving the second UE is not strictly limited herein.

Since the second DM-RS only maps the location of the second DM-RS, it is mapped differently from the CSI-RS. This difference is reflected in that the CSI-RS is the same on all PRB pairs, and the second DM-RS can be the same or different on the adjacent PRB.

In order to describe the above solution more clearly, the resource mapping diagram of the multiple UEs in the MU-MIMO mode will be described in detail below with reference to the resource occupancy pattern on the PRB pair in FIG.

Figure 10 is a resource map of MU-MIMO when two second user equipments perform space division multiplexing in a PRB pair under a normal cyclic prefix. The representation of RE in the different patterns in Fig. 10 has the same meaning as in Fig. 1, and will not be described here.

Specifically, as shown in FIG. 10, UE1 and UE2 are both UEs, and the cross stripes in the figure indicate the RE positions occupied by their second DM-RSs. From left to right, from top to bottom, the first picture is the RE position occupied by the second DM-RS of UE1, the second picture is the RE position occupied by the second DM-RS of UE2, and the third picture is UE1 The RE location shared with the second DM-RS of UE2.

Further, the resource mapping pattern of the second DM-RS on each of the PRBs of the UE1 and the UE2 is the same, although the RE locations occupied by the second DM-RSs of the UE1 and the UE2 are different from the location mapping manner of the CSI-RS, that is, The corresponding CSI-RS configuration number in Table 1 corresponds to this RE arrangement, but the resources occupied by the second DM-RS of UE1 and UE2 are merged, that is, from left to right, the third picture from top to bottom, At this time, UE1 and UE2 jointly occupy 16 REs, and the resources occupied by the two UEs can be represented by the location mapping manner of CSI-RSs of four 4-antenna ports. Specific to the configuration of Table 1 No. You can configure the CSI-RS antenna port number to 4 and configure the CSI-RS configuration number as: 0, 5, 4, 9, to indicate the CSI-RS position mapping of the four 4-antenna ports. the way.

Further, if only the two UEs are used in the first device, only the RE positions of the CSI-RSs of the four 4-antenna ports corresponding to the second DM-RSs of the two UEs need to be zero. The CSI-RS of the power is indicated to the first UE.

Further, for UE1 and UE2, since they each occupy 8 REs, as described above with respect to FIG. 5, the first device is the largest according to the number of REs required for data demodulation of each data stream. Data demodulation of 2 or 4 or 8 or 16 data streams can be supported simultaneously. For example, the number of REs required for data demodulation of each data stream is 2, that is, a maximum of 8 data streams is supported. At this time, the first device can transmit up to 4 data streams for UE1 and UE2 respectively.

In order to reduce the overhead of the second DM-RS, the RE of the second DM-RS may be placed on the PRB adjacent to the time domain or the frequency domain in a sparse manner. 11 is a resource map of MU-MIMO when four second user equipments perform space division multiplexing in one PRB pair under a normal cyclic prefix. RE of the different patterns in Fig. 11 has the same meaning as Fig. 1, and will not be described again here.

Specifically, as shown in FIG. 11, UE1, UE2, UE3, and UE4 are all second UEs, and the cross stripes in the figure indicate the RE positions occupied by their second DM-RSs. It can be seen that the RE positions occupied by the second DM-RSs of the above four UEs are the same as the RE positions occupied by the second DM-RSs of UE1 and UE2 of FIG. 10, that is, from left to right as shown in FIG. The third picture from top to bottom. The difference is that FIG. 11 is equivalent to splitting the resources occupied by the second DM-RS of each second UE in FIG. 10 into two second UEs, that is, occupying the second DM-RS of UE1 in FIG. The resources are split into UE1 and UE2 in FIG. 11, and the resources occupied by the second DM-RS of UE2 in FIG. 10 are split into UE3 and UE4 in FIG. For example, the number of REs required for data demodulation of each data stream is 2, and the first device in FIG. 11 can simultaneously support data demodulation of 8 data streams at the same time, since there are four UEs at this time, each UE has The second DM-RS occupies 4 REs, so each UE can transmit data of 2 data streams. Of course, each UE in FIG. 11 can be further split into two UEs, and the method is similar to that in FIG. 11, and details are not described herein again.

In addition, in order to protect each device that performs MU-MIMO, rate matching needs to be performed in the area where the second DM-RS of the other devices except itself is located, as shown in FIG. FIG. 12 is a rate matching diagram of MU-MIMO when four second user equipments perform space division multiplexing in one PRB pair under a normal cyclic prefix. The representation of RE in different patterns in Figure 12 has the same meaning as Figure 1, and is no longer here. Said.

Specifically, the foregoing four second UEs, UE1, UE2, UE3, and ,4, need not only perform rate matching on the location of the DM-RS of the first UE, but also need to use the second of the remaining second UEs other than themselves. The position of the DM-RS is rate matched.

From the left to the right of Figure 10, the third picture from top to bottom can be seen, the RE of the positive 45 ° diagonal line in the figure is the RE position occupied by the DM-RS of the first UE, and the RE of the cross stripe is four. The RE position occupied by the second DM-RS of the second UE. Still taking the number of REs required for data demodulation of each data stream as 2, then the second DM-RS as a demodulation reference signal can support data demodulation of 8 data streams at the same time, and Data demodulation of 8 data streams that can be supported by a DM-RS of a UE. Therefore, the first device can support MU-MIMO transmission of 16 data streams at the same time, which is equivalent to MU of space division multiplexing. - The transmission capacity of MIMO has doubled.

It can be seen that the use of the second DM-RS does not bring any additional signaling and standardization effects to the first UE, and the first UE can still perform downlink data transmission and measurement after being configured according to the original protocol. In this way, when the UEs that introduce more MU-MIMO are used for space division multiplexing transmission, complete backward compatibility is achieved. FIG. 13 is a flow chart of interaction between a first device and a first user device according to Embodiment 5 of the present invention. As shown in FIG. 13, the method for transmitting the demodulation reference signal in this embodiment may include the following steps:

Step S500: The first device sends the second indication information to the first UE.

Specifically, when the second UE and the first UE multiplex the same time-frequency resource, the first device needs to send the second indication information to the first UE.

Further, the second indication information is used to indicate a location of the demodulation reference signal of the second UE in the physical resource block, so that the first UE performs the rate according to the location of the demodulation reference signal of the second UE in the physical resource block. Match or interfere with the measurement. The location indicated by the indication signaling only needs to include the location of the demodulation reference signal occupied by all the second UEs. The above demodulation reference signal may be either a CSI-RS or a first DM-RS or a second DM-RS.

Further, the second indication information may be carried by zero-power CSI-RS signaling. Step S501: The first UE receives the second indication information sent by the first device.

The executor of this step is the first UE. In practice, the first UE may be the first UE. Specifically, after the first device sends the second indication information to the first UE, the first UE needs to receive the second indication information.

Step S502: The first UE performs rate matching or interference measurement according to a position of the demodulation reference signal of the second UE in the physical resource block.

The executor of this step is the first UE. In practice, the first UE may be the first UE. Specifically, since the second indication information indicates the location of the demodulation reference signal of the second UE in the physical resource block, the first UE may perform rate matching or interference measurement according to the foregoing signaling. In practice, specifically whether to perform rate matching or interference measurement at the location is determined by the first device scheduling. The above demodulation reference signal may be either a CSI-RS or a first DM-RS or a second DM-RS.

With the solution of the foregoing embodiment, the first device actively notifies the first UE to perform rate matching or interference measurement, and implements backward compatibility with the first UE. FIG. 14 is a schematic structural diagram of a first device according to Embodiment 6 of the present invention. As shown in FIG. 14, the first device includes: a determining module 10 and a sending module 11.

Specifically, the determining module 10 is configured to determine a location where the demodulation reference signal is sent in the physical resource block, where the location of the demodulation reference signal includes a channel state information reference signal CSI-RS that has been used by the first device and/or is not used. The mapping location is used to demodulate the data of the second user equipment; the sending module 11 is configured to send configuration information to the second user equipment, where the configuration information is used to indicate the location of the demodulation reference signal in the physical resource block.

Further, the transmitting module 11 is further configured to transmit a demodulation reference signal at a position where the demodulation reference signal is transmitted in the physical resource block.

Further, the configuration information is non-zero power CSI-RS signaling.

Further, the mapping position of the CSI-RS is a set of locations of all resource elements RE for placing CSI-RS in the physical resource block defined in the Long Term Evolution LTE system version Rel-10.

Further, the determining module 10 is specifically configured to: determine, according to the channel state information of the second user equipment, a location where the demodulation reference signal is sent in the physical resource block.

Further, the sending module 11 is further configured to: send a precoding indication to the second user equipment, where the precoding indicates the precoding information used to indicate the user data of the second user equipment, so that the second user sets User data demodulation is performed according to the demodulation reference signal and the precoding information, and the demodulation reference signal includes a CSI-RS for performing a channel measurement operation or a first downlink demodulation reference signal DM for performing user data demodulation. RS: The first DM-RS is a DM-RS that is mapped at a position where the demodulation reference signal is transmitted in the physical resource block according to a mapping manner of the CSI-RS.

Further, the precoding indication is sent by the first device by using downlink control information DCI or radio resource control RRC signaling.

Further, the sending module 11 is further configured to: send the first indication information to the second user equipment, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in the physical resource block.

Further, the first indication information is carried by zero-power CSI-RS signaling.

Further, if the physical resource block includes a location for transmitting the DM-RS to the at least one first user equipment, the location indicated by the first indication information includes a location for transmitting the DM-RS to the at least one first user equipment.

Further, if the demodulation reference signal is used to demodulate data of two or more second user equipments, the location indicated by the first indication information is sent to the two or more second user equipments on the physical resource block. The location of the demodulation reference signal of the second user equipment other than the two user equipments.

Further, the sending module 11 is further configured to: send the second indication information to the at least one first user equipment, where the second indication information is used to indicate that the second user equipment sends the location of the demodulation reference signal, so that the at least one first The user equipment performs rate matching or interference measurement according to the location at which the second user equipment sends the demodulation reference signal.

Further, the second indication information is carried by zero-power CSI-RS signaling.

Further, the sending module 11 is further configured to: send a third indication signaling to the base station, where the third indication signaling is used to indicate that the second user equipment sends the location of the demodulation reference signal, so that the base station reserves the second user equipment. The position at which the demodulation reference signal is transmitted.

Further, the determining module 10 is further configured to: determine, by using a full bandwidth corresponding to the first device, a physical resource block that sends the demodulation reference signal, or determine, on a dedicated bandwidth of the second user equipment, to send the demodulation reference signal. Physical resource block.

In the method for transmitting a demodulation reference signal in the foregoing embodiment, the first device determines a location of transmitting a demodulation reference signal in a physical resource block, where the location of the demodulation reference signal includes that the first device has been used, or is not used. , or the mapped location of the unused CSI-RS that has been used, and The second UE sends configuration information to indicate a position of the demodulation reference signal in the foregoing physical resource block, so that the second UE can perform data demodulation according to the received demodulation reference signal. Since the first device transmits the demodulation reference signal by using the position at which the demodulation reference signal is transmitted as described above, data demodulation of more users can be supported. FIG. 15 is a schematic structural diagram of a first device according to Embodiment 7 of the present invention. As shown in FIG. 15, the first device includes: a determining module 10, a sending module 11, and an encoding module 20. The above-mentioned determination module 10 and the transmission module 11 are the same as those in the foregoing embodiment 6, and are not described herein again.

Specifically, the encoding module 20 is configured to perform precoding on the demodulation reference signal, where the demodulation reference signal is specifically a second DM-RS for performing user data demodulation, and the second DM-RS is mapped according to a preset mapping manner. The DM-RS at the position where the demodulation reference signal is transmitted is transmitted in the physical resource block.

In the method for transmitting a demodulation reference signal in the foregoing embodiment, the first device determines a location of transmitting a demodulation reference signal in a physical resource block, where the location of the demodulation reference signal includes that the first device has been used, or is not used. Or mapping location of the unused CSI-RS that has been used, and transmitting configuration information to the second UE to indicate the location of the demodulation reference signal in the foregoing physical resource block, so that the second UE can be based on the received solution The reference signal is adjusted for data demodulation. Since the first device transmits the demodulation reference signal by using the position at which the demodulation reference signal is transmitted as described above, it is possible to support data demodulation of more users. FIG. 16 is a schematic structural diagram of a second device according to Embodiment 8 of the present invention. As shown in FIG. 16, the second device includes: a receiving module 30 and a determining module 31.

Specifically, the receiving module 30 is configured to receive configuration information sent by the first device, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block, and the determining module 31 is configured to determine demodulation according to the configuration information received by the receiving module 30. The receiving module 30 is further configured to receive, at a position in the physical resource block, the demodulation reference signal sent by the first device, where the determining module 31 determines the demodulation reference signal, and the determining module 31 determines The location of the demodulation reference signal in the physical resource block includes the mapped position of the CSI-RS that has been used by the first device and/or is unused, and the demodulation reference signal is used to demodulate the data of the second user equipment.

Further, the configuration information is non-zero power CSI-RS signaling.

Further, the mapping position of the CSI-RS is determined by the Long Term Evolution LTE system version Rel-10. A set of locations of all resource elements RE for placing CSI-RSs in a physical resource block.

Further, the receiving module 30 is further configured to: receive a precoding indication sent by the first device, and acquire precoding information of the user data of the second user equipment according to the precoding indication; where the demodulation reference signal is included for performing a CSI-RS for channel measurement operation or a first downlink demodulation reference signal DM-RS for performing user data demodulation, the first DM-RS is configured to transmit and demodulate in a physical resource block according to a CSI-RS mapping manner The DM-RS at the position of the reference signal.

Further, the receiving module 30 is further configured to: receive the first indication information sent by the first device, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in the physical resource block; Rate indicating or interference measurement is performed on a location in the physical resource block indicated by the indication information.

In the transmission method of the demodulation reference signal of the above embodiment, the second UE receives the demodulation reference signal at the position indicated by the configuration information in the physical resource block according to the configuration information, thereby performing data demodulation according to the demodulation reference signal. Since the demodulation reference signal of the second UE is used at the mapping position of the unused CSI-RS that has been used by the first device, or is not used, the data demodulation of more users can be implemented. . FIG. 17 is a schematic structural diagram of a second device according to Embodiment 9 of the present invention. As shown in FIG. 17, the second device includes: a receiving module 30, a determining module 31, and a demodulating module 41. The receiving module 30 and the determining module 31 are the same as those in the foregoing embodiment 8, and are not described herein again.

Specifically, the demodulation module 41 is configured to perform user data demodulation according to the demodulation reference signal and the precoding information, where the demodulation reference signal includes a CSI-RS for performing a channel measurement operation or a user data demodulation for performing user data demodulation. The first downlink demodulation reference signal DM-RS, the first DM-RS is a DM-RS that is mapped at a position where the demodulation reference signal is transmitted in the physical resource block according to a mapping manner of the CSI-RS.

In the transmission method of the demodulation reference signal in the above embodiment, the second UE receives the demodulation reference signal at the position indicated by the configuration information in the physical resource block according to the configuration information, thereby performing data demodulation according to the demodulation reference signal. Since the demodulation reference signal of the second UE is used at the mapping position of the unused CSI-RS that has been used by the first device, or is not used, the data demodulation of more users can be implemented. . FIG. 18 is a schematic structural diagram of a first device according to Embodiment 10 of the present invention. As shown in FIG. 18, the first device includes: a processor 50 and a transmitter 51.

Specifically, the processor 50 is configured to determine a location where the demodulation reference signal is sent in the physical resource block, where the location of the demodulation reference signal includes a channel state information reference signal CSI-RS that has been used by the first device and/or is not used. a mapping location, the demodulation reference signal is used to demodulate data of the second user equipment; the transmitter 51 is configured to send configuration information to the second user equipment, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block; The transmitter 51 is further configured to transmit a demodulation reference signal at a position where the demodulation reference signal is transmitted in the physical resource block.

Further, the configuration information is non-zero power CSI-RS signaling.

Further, the processor 50 is specifically configured to: determine, according to channel state information of the second user equipment, a location for transmitting the demodulation reference signal in the physical resource block.

Further, the transmitter 51 is further configured to: send a precoding indication to the second user equipment, where the precoding indicates the precoding information used to indicate the user data of the second user equipment, so that the second user equipment according to the demodulation reference The signal and the precoding information are subjected to user data demodulation, and the demodulation reference signal includes a CSI-RS for performing a channel measurement operation or a first downlink demodulation reference signal DM-RS for performing user data demodulation, the first DM The -RS maps the DM-RS at the position where the demodulation reference signal is transmitted in the physical resource block in accordance with the mapping manner of the CSI-RS.

Further, the processor 50 is further configured to: precode the demodulation reference signal, where the demodulation reference signal is specifically a second DM-RS for performing user data demodulation, and the second DM-RS is preset according to the preset The mapping mode maps the DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

Further, the transmitter 51 is further configured to: send the first indication information to the second user equipment, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in the physical resource block.

Further, if the physical resource block includes a location for transmitting the DM-RS to the at least one first user equipment, the location indicated by the first indication information includes sending to the at least one first user equipment The location of the DM-RS.

Further, the transmitter 51 is further configured to: send the second indication information to the at least one first user equipment, where the second indication information is used to indicate that the second user equipment sends the location of the demodulation reference signal, so that the at least one first The user equipment performs rate matching or interference measurement according to the location at which the second user equipment sends the demodulation reference signal.

Further, the transmitter 51 is further configured to: send a third indication signaling to the base station, where the third indication signaling is used to indicate, by the second user equipment, a location of the demodulation reference signal, so that the base station reserves the second user equipment. The position at which the demodulation reference signal is transmitted.

Further, the processor 50 is further configured to: determine, by using a full bandwidth corresponding to the first device, a physical resource block that sends the demodulation reference signal, or determine, on a dedicated bandwidth of the second user equipment, to send the demodulation reference signal. Physical resource block.

In the method for transmitting a demodulation reference signal in the foregoing embodiment, the first device determines a location of transmitting a demodulation reference signal in a physical resource block, where the location of the demodulation reference signal includes that the first device has been used, or is not used. Or mapping location of the unused CSI-RS that has been used, and transmitting configuration information to the second UE to indicate the location of the demodulation reference signal in the foregoing physical resource block, so that the second UE can be based on the received solution The reference signal is adjusted for data demodulation. Since the first device transmits the demodulation reference signal by using the position at which the demodulation reference signal is transmitted as described above, it is possible to support data demodulation of more users. FIG. 19 is a schematic structural diagram of a second device according to Embodiment 11 of the present invention. As shown in FIG. 19, the second device includes: a receiver 60 and a processor 61.

Specifically, the receiver 60 is configured to receive configuration information sent by the first device, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block; and further, the processor 61 is configured to receive according to the configuration received by the receiver 60. The information is used to determine the position of the demodulation reference signal in the physical resource block; the receiver 60 is further configured to receive the demodulation reference signal sent by the first device at a position of the demodulation reference signal determined by the processor 61 in the physical resource block, and process The demodulation reference signal determined by the unit 61 is in the physical resource block The location includes a mapped location of the CSI-RS that has been used by the first device and/or is unused, and the demodulation reference signal is used to demodulate data of the second user equipment.

Further, the configuration information is non-zero power CSI-RS signaling.

Further, the receiver 60 is further configured to: receive a precoding indication sent by the first device; acquire precoding information of user data of the second user equipment according to the precoding indication; and the processor 61 is further configured to use the demodulation reference according to the demodulation reference. Demodulating the user data by the signal and the precoding information; wherein the demodulation reference signal comprises a CSI-RS for performing a channel measurement operation or a first downlink demodulation reference signal DM-RS for performing user data demodulation, A DM-RS maps a DM-RS at a position where a demodulation reference signal is transmitted in a physical resource block according to a mapping manner of a CSI-RS.

Further, the demodulation reference signal is a second DM-RS for performing user data demodulation after precoding, and the second DM-RS is configured to perform demodulation in a physical resource block according to a preset mapping manner. The DM-RS at the position of the reference signal.

Further, the receiver 60 is further configured to: receive the first indication information sent by the first device, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in the physical resource block; Rate indicating or interference measurement is performed on a location in the physical resource block indicated by the indication information.

In the transmission method of the demodulation reference signal of the above embodiment, the second UE receives the demodulation reference signal at the position indicated by the configuration information in the physical resource block according to the configuration information, thereby performing data demodulation according to the demodulation reference signal. Since the demodulation reference signal of the second UE is used at the mapping position of the unused CSI-RS that has been used by the first device, or is not used, the data demodulation of more users can be implemented. .

It will be understood by those skilled in the art that all or part of the steps of implementing the above method embodiments may be performed by hardware related to the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: ROM, RAM, disk or optical disk, and the like, which can store program codes. Medium.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

Claim

A method for transmitting a demodulation reference signal, comprising:

Determining, by the first device, a location of transmitting a demodulation reference signal in the physical resource block, where the location of the transmit demodulation reference signal includes a channel state information reference signal CSI-RS that has been used by the first device and/or is not used Mapping a location, the demodulation reference signal is used to demodulate data of the second user equipment;

2. The method according to claim 1, wherein the configuration information is non-zero power CSI-RS signaling.

The method according to claim 1 or 2, wherein the mapping position of the CSI-RS is used to place the CSI in the physical resource block defined in the Long Term Evolution (LTE) system version Rel-10. A collection of locations of all resource element REs of the RS.

The method according to any one of claims 1-3, wherein the determining, by the first device, the location of the demodulation reference signal in the physical resource block, specifically includes:

And determining, by the first device, a location for transmitting a demodulation reference signal in the physical resource block according to channel state information of the second user equipment.

The method according to any one of claims 1-4, wherein the first device sends the demodulation reference signal at a position where the demodulation reference signal is sent in the physical resource block. , Also includes:

The method according to claim 5, wherein the precoding indication is that the first device sends by using downlink control information DCI or radio resource control RRC signaling.

The method according to any one of claims 1 to 7, wherein before the first device sends the demodulation reference signal at a position where the demodulation reference signal is sent in the physical resource block, , Also includes:

The method according to claim 8, wherein the first indication information is carried by zero-power CSI-RS signaling.

The method according to claim 8 or 9, wherein, if the physical resource block includes a location for transmitting the DM-RS to the at least one first user equipment, the location indicated by the first indication information includes Sending, to the at least one first user equipment, a location of the DM-RS.

The method according to any one of claims 8 to 10, wherein, if the demodulation reference signal is used to demodulate data of two or more second user equipments, the first indication information indicates The location includes a location of the demodulation reference signal transmitted to the second user equipment of the two or more second user equipments other than the second user equipment on the physical resource block.

The method according to any one of claims 1 to 11, wherein before the first device sends the demodulation reference signal at a position where the demodulation reference signal is sent in the physical resource block , Also includes:

The first device sends second indication information to the at least one first user equipment, where the second indication information is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the at least one A user equipment performs rate matching or interference measurement according to a location at which the second user equipment sends a demodulation reference signal.

The method according to claim 12, wherein the second indication information is passed Zero-power CSI-RS signaling bearer.

The method according to any one of claims 1 to 13, wherein after the first device transmits the demodulation reference signal at a position where the demodulation reference signal is sent in the physical resource block, , Also includes:

The first device sends a third indication signaling to the base station, where the third indication signaling is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the base station reserves the second user. The location of the demodulation reference signal of the device in the physical resource block.

The method according to any one of claims 1 to 14, wherein the first device sends the demodulation reference signal at a position where the demodulation reference signal is sent in the physical resource block, Also includes:

Determining, by the first device, a physical resource block that sends the demodulation reference signal on a full bandwidth corresponding to the first device, or determining to send the demodulation reference signal on a dedicated bandwidth of the second user equipment Physical resource block.

16. A method for transmitting a demodulation reference signal, comprising:

Receiving, by the second user equipment, configuration information sent by the first device, where the configuration information is used to indicate a location of the demodulation reference signal in a physical resource block;

The second user equipment receives the demodulation reference signal sent by the first device at a location indicated by the configuration information in the physical resource block, where the location indicated by the configuration information includes that the first device has been A mapping location of the used and/or unused CSI-RS, the demodulation reference signal being used to demodulate data of the second user equipment.

17. The method according to claim 16, wherein the configuration information is non-zero power CSI-RS signaling.

The method according to claim 16 or 17, wherein the mapping position of the CSI-RS is used to place the CSI in the physical resource block defined in the Long Term Evolution (LTE) system version Rel-10. A collection of locations of all resource element REs of the RS.

The method according to any one of claims 16 to 18, wherein the second user equipment receives the location sent by the first device at a location indicated by the configuration information in the physical resource block. Before demodulating the reference signal, it also includes:

Obtaining, by the second user equipment, the user of the second user equipment according to the precoding indication Precoding information of the data;

The method according to claim 19, wherein the precoding indication is that the first device is sent by using downlink control information DCI or radio resource control RRC signaling.

The method according to any one of claims 16 to 18, wherein the demodulation reference signal is a second DM-RS for performing user data demodulation after precoding, the second The DM-RS maps the DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block according to a preset mapping manner.

The method according to any one of claims 16 to 21, wherein the second user equipment receives the location sent by the first device at a location indicated by the configuration information in the physical resource block. Before demodulating the reference signal, it also includes:

Receiving, by the second user equipment, first indication information that is sent by the first device, where the first indication information is used to indicate a location where the second user equipment performs rate matching or interference measurement in a physical resource block;

The method according to claim 22, wherein the first indication information is carried by CSI-RS signaling of zero power.

24. A first device, comprising:

a determining module, configured to determine a location of transmitting a demodulation reference signal in a physical resource block, where the location of the transmit demodulation reference signal includes a channel state information reference signal CSI that has been used by the first device and/or is not used a mapping position of the RS, the demodulation reference signal is used to demodulate data of the second user equipment; a sending module, configured to send, to the second user equipment, configuration information, where the configuration information is used to indicate a location of the demodulation reference signal in the physical resource block;

The first device according to claim 24, wherein the configuration information is non-zero power CSI-RS signaling.

The first device according to claim 24 or 25, wherein the mapping position of the CSI-RS is used in the physical resource block defined in the Long Term Evolution (LTE) system version Rel-10 for placing the A collection of locations of all resource elements RE of the CSI-RS.

The first device according to any one of claims 24-26, wherein the determining module is specifically configured to:

And determining, according to channel state information of the second user equipment, a location at which the demodulation reference signal is transmitted in the physical resource block.

The first device according to any one of claims 24-27, wherein the sending module is further configured to:

The first device according to claim 28, wherein the precoding indication is that the first device is sent by using downlink control information DCI or radio resource control RRC signaling.

The first device according to any one of claims 24-27, wherein the first device further comprises:

31. The first device according to any one of claims 24-30, wherein The delivery module is also used to:

The first device according to claim 31, wherein the first indication information is carried by zero-power CSI-RS signaling.

The first device according to claim 31 or 32, wherein, if the physical resource block includes a location for transmitting the DM-RS to the at least one first user equipment, the first indication information indicates The location includes the location at which the DM-RS is transmitted to the at least one first user equipment.

The first device according to any one of claims 31 to 33, wherein, if the demodulation reference signal is used to demodulate data of two or more second user equipments, the first indication information The indicated location includes a location of the demodulation reference signal transmitted to the second user equipment of the two or more second user equipments other than the second user equipment on the physical resource block.

The first device according to any one of claims 24-34, wherein the sending module is further configured to:

Sending the second indication information to the at least one first user equipment, where the second indication information is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the at least one first user equipment The second user equipment sends the location of the demodulation reference signal for rate matching or

,

The first device according to claim 35, wherein the second indication information is carried by CSI-RS signaling with zero power.

The first device according to any one of claims 27 to 36, wherein the sending module is further configured to:

The first device according to any one of claims 24-37, wherein the determining module is further configured to:

Determining a physical resource block that sends the demodulation reference signal on a full bandwidth corresponding to the first device, or determining a physical resource block that sends the demodulation reference signal on a dedicated bandwidth of the second user equipment.

39. A second user equipment, comprising:

40. The second user equipment according to claim 39, wherein the configuration information is non-zero power CSI-RS signaling.

The second user equipment according to claim 39 or 40, wherein the mapping location of the CSI-RS is used in the physical resource block defined in the Long Term Evolution (LTE) system version Rel-10. A set of locations of all resource elements RE of the CSI-RS.

The second user equipment according to any one of claims 39 to 41, wherein the receiving module is further configured to:

Receiving a precoding indication sent by the first device;

The second user equipment further includes:

The second user equipment according to claim 42, wherein the precoding indication is that the first device is sent by using downlink control information DCI or radio resource control RRC signaling.

The second user equipment according to any one of claims 39 to 41, wherein the demodulation reference signal is a second DM-RS for performing user data demodulation after precoding. The second DM-RS is configured to map the DM-RS at the location of the transmit demodulation reference signal in the physical resource block according to a preset mapping manner.

The second user equipment according to any one of claims 39 to 44, wherein the receiving module is further configured to:

The second user equipment according to claim 45, wherein the first indication information is carried by zero-power CSI-RS signaling.

47. A first device, comprising:

The first device according to claim 47, wherein the configuration information is non-zero power CSI-RS signaling.

The first device according to claim 47 or 48, wherein the mapping position of the CSI-RS is used in the physical resource block defined in the Long Term Evolution (LTE) system version Rel-10 for placing the A collection of locations of all resource elements RE of the CSI-RS.

The first device according to any one of claims 47 to 49, wherein the processor is specifically configured to:

Determining, according to channel state information of the second user equipment, a location at which the demodulation reference signal is transmitted in the physical resource block.

The first device according to any one of claims 47-50, wherein the transmitter is further configured to:

The first device according to claim 51, wherein the precoding indication is that the first device is sent by using downlink control information DCI or radio resource control RRC signaling.

The first device according to any one of claims 47-50, wherein the processor is further configured to:

Pre-coding the demodulation reference signal, where the demodulation reference signal is specifically a second DM-RS for performing user data demodulation, and the second DM-RS is mapped according to a preset mapping manner. The DM-RS at the location where the demodulation reference signal is transmitted in the physical resource block.

The first device according to any one of claims 47-53, wherein the transmitter is further configured to:

The first device according to claim 54, wherein the first indication information is carried by zero-power CSI-RS signaling.

The first device according to claim 54 or 55, wherein, if the physical resource block includes a location for transmitting the DM-RS to the at least one first user equipment, the first indication information indicates The location includes the location at which the DM-RS is transmitted to the at least one first user equipment.

The first device according to any one of claims 54-56, wherein, if the demodulation reference signal is used to demodulate data of two or more second user equipments, the first indication information The indicated location includes a location of the demodulation reference signal transmitted to the second user equipment of the two or more second user equipments other than the second user equipment on the physical resource block.

The first device according to any one of claims 47-57, wherein the transmitter is further configured to: Sending the second indication information to the at least one first user equipment, where the second indication information is used to indicate that the second user equipment sends a location of the demodulation reference signal, so that the at least one first user equipment The second user equipment sends the location of the demodulation reference signal for rate matching or

The first device according to claim 58, wherein the second indication information is carried by CSI-RS signaling with zero power.

The first device according to any one of claims 50 to 59, wherein the transmitter is further configured to:

The first device according to any one of claims 47-60, wherein the processor is further configured to:

Determining, by the first device, a physical resource block that sends the demodulation reference signal, or determining, on a dedicated bandwidth of the second user equipment, a physical resource block that sends the demodulation reference signal.

62. A second user equipment, comprising:

The receiver is further configured to receive, by the processor, the demodulation reference signal sent by the first device at a position of the demodulation reference signal in the physical resource block, where the processor determines The location of the demodulation reference signal in the physical resource block includes a mapping location of a CSI-RS that has been used and/or unused by the first device, the demodulation reference signal being used to demodulate the The data of the second user equipment.

63. The second user equipment according to claim 62, wherein the configuration information is non-zero power CSI-RS signaling.

The second user equipment according to claim 62 or 63, wherein the mapping location of the CSI-RS is the physical resource defined in the Long Term Evolution (LTE) system version Rel-10 A set of locations in the block for placing all resource elements RE of the CSI-RS.

The second user equipment according to any one of claims 62-64, wherein the receiver is further configured to:

Receiving a precoding indication sent by the first device;

66. The second user equipment according to claim 65, wherein the precoding indication is that the first device sends by using downlink control information DCI or radio resource control RRC signaling.

The second user equipment according to any one of claims 62-64, wherein the demodulation reference signal is a second DM-RS for performing user data demodulation after precoding. The second DM-RS is configured to map the DM-RS at the location of the transmit demodulation reference signal in the physical resource block according to a preset mapping manner.

The second user equipment according to any one of claims 62 to 67, wherein the receiver is further configured to:

The second user equipment according to claim 68, wherein the first indication information is carried by zero-power CSI-RS signaling.