WO2014110928A1

WO2014110928A1 - Uplink demodulation reference signal sending method, apparatus and system

Info

Publication number: WO2014110928A1
Application number: PCT/CN2013/086115
Authority: WO
Inventors: 王瑜新; 关艳峰; 孙云锋; 陈艺戬; 李书鹏; 陈宪明; 罗薇
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-01-18
Filing date: 2013-10-29
Publication date: 2014-07-24
Also published as: CN103944665A; CN103944665B

Abstract

An uplink demodulation reference signal (DMRS) sending method comprises: a base station configuring a resource, a pattern or a parameter set required for sending an uplink DMRS for a user equipment, wherein the resource, the pattern or the parameter set comprises a time-domain position, a frequency-domain position, a subframe configuration or a cycle, and a hopping mode; and the base station sending or giving an instruction about the resource, the pattern or the parameter set required for sending the uplink DMRS to the user equipment through a bit domain of downlink control information or a high-level signaling.

Description

Method, device and system for transmitting uplink demodulation reference signal

Technical field

The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for transmitting a Demodulation Reference Signal (DMRS).

Background technique

The uplink physical channel of the Long Term Evolution (LTE) includes a physical random access channel (PRACH), a physical shared shared channel (PUSCH), and a physical uplink shared channel (PUCCH, Physical Uplink). Control Channel). The Uplink Scheduling Information for the PUSCH is sent to the target user terminal (UE, User Equipment) through the Physical Downlink Control Channel (PDCCH). The uplink scheduling information includes: resource allocation related to the physical uplink shared channel, modulation and coding scheme, and cyclic shift of the DMRS (Cyclic Shift).

In the LTE system, the physical uplink shared channel is transmitted by a single antenna port. A system frame (frame) contains 10 subframes, each of which contains 2 slots (slots). 1 is a schematic diagram of a conventional cyclic prefix in a slot according to the related art. As shown in FIG. 1, for a normal cyclic prefix (Normal CP), each slot is composed of 6 data symbols and 1 A demodulation reference signal is formed. 2 is a schematic diagram of an extended cyclic prefix in a slot according to the related art. For an extended cyclic prefix (Extended Cyclic), each slot is composed of 5 data symbols and 1 demodulation reference signal. composition.

Demodulation Reference Signal The DM RS consists of a sequence in the frequency domain that is a cyclic shift of the reference signal sequence. In order to randomize the inter-cell interference, the reference signal sequence of the demodulation reference signal may be based on the configuration of the base station, and may implement a sequence hopping or a sequence group hopping (SGH), which may also be referred to as time. SGH mode of slot jump. That is, according to the configuration of the base station, the demodulation reference signals of one user equipment in two time slots in one subframe are different, and vary with the time slot in one system frame according to a certain jump pattern.

In the time slot, the cyclic shift amount of the demodulation reference signal is: a = 7 m _cs l\l , where = ("S^ + "H + _ra ))modl2. In a radio frame, = 0, 1,...,19 ; "^^ is configured by higher-level parameters, configured by uplink scheduling information, and _PRS ( ) is generated by a pseudo-random generator, which is a parameter that varies with time slots. Specifically represented as 3⁄4«( ) = ^. 8 \^ _3⁄4 . +/) .2'' , the pseudo-random sequence generator is initialized once per radio frame, the initial condition is _3⁄4 = .1 ⁵ + f 诵, initialization value

30

Related to the cell ID to which it belongs, is a cell-specific parameter.

The uplink scheduling information is carried on the physical downlink control channel, and is sent by the base station to the target user equipment in a certain downlink control information format (Downlink Control Information Format, DCI format). In the LTE system, the downlink control information format is divided into the following types: DCI format 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, etc., where DCI format 0 contains uplink scheduling information, and is used for Indicates the scheduling of the physical uplink shared channel PUSCH.

The LTE-Advanced system (referred to as LTE-A system) is the next-generation evolution system of the LTE system. In the LTE-A system, the physical uplink shared channel can be transmitted using a single antenna port or multi-antenna port. 3 is a schematic diagram of a baseband signal processing of a physical uplink shared channel transmitted by a multi-antenna port in the LTE-A system of the related art. As shown in FIG. 3, when transmitting in a multi-antenna port, the LTE-A system supports one based on one. Or spatial multiplexing of two codewords (CW), each codeword corresponding to one transport block (Transport Block, referred to as TB). 4 is a schematic diagram of mapping of uplink codewords to layers of the LTE-A system of the related art. As shown in FIG. 4, the codewords are further mapped to layers, and each codeword is mapped to one or two layers of data.

LTE-A uses a precoding technique based on Codebook (also known as codebook). Precoding technology is a channel-side information (Channel Status Information (CSI)). Techniques for performing pre-processing to improve the performance of multi-antenna systems. One way for the transmitter to acquire CSI is through feedback from the receiver. In order to reduce the feedback overhead, the general method is to save the same codebook at the receiving end and the transmitting end. The receiving end selects a suitable precoding matrix in the codebook according to the current channel condition, and feeds back its index value (PMI) in the set back to the transmitting end, and the transmitting end finds according to the feedback precoding matrix index. Precoding the matrix and precoding the transmitted signal. The mathematical model of data precoding is y ^{= :W3⁄4 +} " , where y is the received signal vector, H is the channel coefficient matrix, W is the precoding matrix, s is the signal vector, and n is the noise vector.

In the LTE-A system, when the physical uplink shared channel is transmitted by multiple antenna ports, each layer of data is transmitted. The DMRS is precoded like the layers of data. Demodulation reference signals for different layer data, including demodulation reference signals for multi-layer data of the same user equipment for single-user multiple input multiple output system (SU-MIMO), and multi-user multiple input multiple output system (MU-MIMO) Demodulation reference signals of multi-layer data of a plurality of user equipments are orthogonalized by using different demodulation reference signal cyclic shifts (CS) and/or Orthogonal Cover Codes (OCCs) Differentiate different layer data of user space reuse or distinguish different users. The orthogonal mask OCC is [+1, +1] and [+1, -1], and acts on the demodulation reference signal on two slots (Slot) in one subframe (Subframe).

Currently, in the standard version developed by 3GPP, the LTE standard version is Release 8 and Release 9 , and the LTE-A standard is Release 10 and Release 11 ( Release 11), abbreviated as Rel-8, Rel-9, Rel-10 and Rel-11 respectively, the LTE-A standard may also include subsequent versions, such as Rel-12. In the current Rel-11 version, the base station can indicate the cyclic shift/OCC information of the demodulation reference signal for the scheduled PUSCH through DCI format 0 and DCI format 4, as shown in Table 1.

Table 1 [ ^{w (Q) w (1)} ] mapping table of the cyclic shift region of the uplink related DCI format

When the orthogonal reference mask OCC is used to orthogonalize the demodulation reference signal, the base station needs to jointly detect the demodulation reference signals on the two slots in one subframe, thus requiring one user equipment to be two in one subframe. The demodulation reference signal on the time slot must be the same. In this case, the SGH method of slot jump in the LTE system cannot be used. However, in order to randomize inter-cell interference as much as possible, a SGH method of sub-frame jump is proposed in the related art. That is, according to the configuration of the base station, the demodulation reference signals of one user equipment in two slots in one subframe are the same, and demodulation on each subframe in one system frame. The reference signals are not the same, and vary with the sub-frames within a system frame according to a certain jump pattern.

As the demand for mobile data services increases, the transmission capacity of mobile communication networks poses a serious challenge. At present, most of the mobile data traffic occurs in Small Cell, and this proportion will continue to grow. Therefore, operators urgently need high-rate small cell coverage data service solutions. The characteristics of the small cell are that the user is usually a fixed user or a very low-speed mobile user, the delay spread of the wireless channel is small, and the environment of the wireless channel changes slowly. In addition, the data service is mainly based on the Internet Protocol (Internet Procotol, IP for short). The service, the transmission delay is not high, but the data rate is higher. At present, the design of the LTE/LTE-A system can adapt to the scenario where the delay spread is relatively large and the wireless channel changes rapidly. For the uplink data transmission of the small cell, if the current LTE/LTE-A system transmission method is used, it will bring The transmission efficiency is low and the DMRS overhead is too large. Therefore, in the related art, there is a problem that the overhead of the uplink demodulation reference signal is excessive.

Summary of the invention

The invention provides a method, a device and a system for transmitting an uplink demodulation reference signal, which solves the problem that the time-frequency resource overhead of the uplink demodulation reference signal is too large. A method for transmitting an uplink demodulation reference signal includes:

The base station configures, for the user equipment, a resource or a pattern or a parameter set required for transmitting the uplink DMRS, where the resource or pattern or parameter set includes:

Time domain location, frequency domain location, subframe configuration or period, and jump mode;

The base station sends or indicates the resource or pattern or parameter set required for sending the uplink DMRS to the user terminal by using a bit field or higher layer signaling of the downlink control information.

Preferably, when the downlink control information is used to schedule the user terminal in consecutive M subframes, the time domain location of the uplink DMRS is:

The DMRS is on a first subframe and/or a last subframe and/or a ceil (M/2) subframe and/or a ceil (M/2) + 1 subframe of the M subframes, where , M is an integer, and ceil() means rounding up.

Preferably, when the uplink symbol cyclic prefix length is a normal length, the time domain location is: The first time slot of the subframe including the uplink DMRS and/or the fourth orthogonal frequency division multiplexing (OFDM) symbol of the second time slot, or

The 7th OFDM symbol of the 1st slot of the subframe of the uplink DMRS or the 1st OFDM symbol of the 2nd slot of the subframe.

Preferably, when the uplink symbol cyclic prefix length is an extended length, the time domain position is: a first time slot of a subframe including an uplink DMRS and/or a third OFDM symbol of a second time slot, or

The sixth OFDM symbol of the first slot of the subframe including the uplink DMRS or the first OFDM symbol of the second slot of the subframe.

Preferably, the frequency domain location includes:

All subcarriers or partial subcarriers of the bandwidth where the physical uplink shared channel (PUSCH) of the uplink DMRS of the user terminal is located in the time domain location.

Preferably, the subframe configuration or period includes:

The subframe configuration index of the uplink DMRS, the period of the uplink DMRS, and the subframe offset of the uplink DMRS.

Preferably, the jumping manner includes:

In the subframe n, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, where n is an integer.

In subframe n+1, the uplink DMRS sequence of the user terminal occupies the lower half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the upper half bandwidth.

In the subframe n+2, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, and sequentially loops.

Preferably, the jumping manner includes:

In the first time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, where n is an integer.

In the second time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the lower half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the upper half bandwidth. The configuration on the subframe n+1 is the same as that of the subframe n, and the loop jumps in sequence.

Preferably, the base station sends or indicates to the user terminal the resource or the pattern or the parameter set required for sending the uplink DMRS by using the bit field or the high layer signaling of the downlink control information:

The base station configures, by using the high layer signaling, the at least one resource or pattern or parameter set required for sending the uplink DMRS, and selects one of the at least one resource or the pattern or the parameter set by using a bit field in the downlink control information. .

Preferably, the downlink control information includes downlink control information for scheduling a PUSCH or for scheduling a physical downlink shared channel (PDSCH) or downlink control information for a user terminal for scheduling a small cell.

Preferably, the bit field in the downlink control information includes:

Carrier indicator bit field, or cyclic shift and OCC index bit field of DMRS, or a bit field used to indicate the period or subframe configuration or subframe offset or pattern of DMRS, or to indicate continuous scheduling The bit field of the number of subframes.

Preferably, the bit field for indicating a period or subframe configuration or subframe offset or pattern of the uplink DMRS and the bit field for indicating the number of consecutively scheduled subframes are carried in a user-specific DCI Format In the domain, or in the DCI Format field dedicated to the user terminal carrying the scheduled small cell.

Preferably, when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies the frequency domain position of the same bandwidth, the two DMRS symbols are time-domain extended using an orthogonal mask (OCC).

Preferably, the using the OCC to perform time domain expansion on the two DMRS symbols is: when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies frequency domain positions of different bandwidths, using an OCC pair The first DMRS symbol of the subframe n and the first DMRS symbol of the subframe n+1 are time-domain extended, and the second DMRS symbol of the subframe n and the second DMRS symbol of the subframe n+1 are performed by using the OCC. Domain extension.

The present invention also provides a method for transmitting an uplink demodulation reference signal, including:

The user terminal receives the resources or patterns or parameters sent by the base station for configuring the uplink DMRS. a bit field or higher layer signaling of the downlink control information of the data set, where the resource or pattern or parameter set includes: a time domain location, a frequency domain location, a subframe configuration or a period, and a jump mode;

The user terminal sends an uplink DMRS according to a resource or a pattern or a parameter set required by the uplink DMRS configured by the base station.

Preferably, when the uplink symbol cyclic prefix length is a normal length, the time domain position is: a first time slot of a subframe including an uplink DMRS and/or a fourth OFDM symbol of a second time slot, or

Preferably, the frequency domain location includes:

All subcarriers or partial subcarriers of the bandwidth of the PUSCH where the uplink DMRS of the user terminal is located in the time domain location. Preferably, the subframe configuration or period includes:

Preferably, the jumping manner includes:

In subframe n, the uplink DMRS sequence of the user terminal occupies the upper half of the PUSCH bandwidth. a subcarrier of a bandwidth subcarrier or a lower half bandwidth, where n is an integer,

Preferably, the jumping manner includes:

In the second time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the lower half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the upper half bandwidth.

The configuration on the subframe n+1 is the same as that of the subframe n, and the loop jumps in sequence.

Preferably, when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies the frequency domain position of the same bandwidth, the OCC is used to perform time domain expansion on the two DMRS symbols.

Preferably, the downlink control information includes downlink control information for scheduling a PUSCH or for scheduling a PDSCH or downlink control information for a user terminal for scheduling a small cell.

Preferably, the bit field in the downlink control information includes:

The carrier indicates a bit field, or a cyclic shift of the DMRS and an OCC index bit field, or a bit field for indicating a period or subframe configuration or a subframe offset or pattern of the DMRS, or for indicating the number of consecutively scheduled subframes. Bit field.

Preferably, the bit field for indicating a period or subframe configuration or subframe offset or pattern of the uplink DMRS and the bit field for indicating the number of consecutively scheduled subframes are carried by the user-specific The DCI Format field is either carried in the DCI Format field dedicated to the user terminal that carries the scheduled small cell.

The present invention also provides an apparatus for transmitting an uplink demodulation reference signal, including:

The configuration module is configured to: configure, for the user terminal, a resource or a pattern or a parameter set required for sending the uplink DMRS, where the resource or pattern or parameter set includes:

The indication module is configured to send or indicate the resource or pattern or parameter set required for sending the uplink DMRS to the user terminal by using downlink control information or high layer signaling.

A transmitting device for an uplink demodulation reference signal, comprising:

The receiving module is configured to: receive downlink control information or high layer signaling sent by the base station to configure a resource or a pattern or a parameter set required for the uplink DMRS, where the resource or the pattern or the parameter set includes:

The signal sending module is configured to: send an uplink DMRS according to a resource or a pattern or a parameter set required by the uplink DMRS configured by the base station.

The present invention also provides a transmission system for an uplink demodulation reference signal, including a base station and a user equipment therebelow;

The base station is configured to: configure, for the user equipment, a resource or a pattern or a parameter set required for sending an uplink DMRS, and use the bit field or high layer signaling of the downlink control information to send the resource or pattern required for the uplink DMRS. Or the parameter set is sent or indicated to the user terminal, and the resource or pattern or parameter set includes:

The user terminal is configured to: receive downlink control information or high layer signaling that is used by the base station to configure a resource or a pattern or a parameter set required for an uplink DMRS, and configured according to the base station The uplink DMRS is sent by the resources or patterns or parameter sets required for the uplink DMRS.

Preferably, the frequency domain location includes:

Preferably, the jumping manner includes:

In the subframe n+1, the uplink DMRS sequence of the user terminal occupies the lower half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the upper half bandwidth. In the subframe n+2, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, and sequentially loops.

Preferably, the jumping manner includes:

Preferably, the base station is configured to: send, by using the downlink control information or the high layer signaling, the resource or the pattern or the parameter set required for sending the uplink DMRS to the user terminal:

The base station configures, by using the high layer signaling, the at least one resource or pattern or parameter set required for sending the uplink DMRS, and selects one of the at least one resource or pattern or parameter set by using a bit field in the downlink control information. One.

Preferably, the bit field in the downlink control information includes:

The present invention provides a method, an apparatus, and a system for transmitting an uplink demodulation reference signal, where the base station configures a resource or a pattern or a parameter set required for transmitting an uplink DMRS, and sends the same by using downlink control information or higher layer signaling. The resource or pattern or parameter set required by the uplink DMRS is sent or indicated to the user terminal, and the resource or pattern or parameter set includes: a time domain location, a frequency domain location, Subframe configuration or period, jump mode; the user terminal receives the uplink sent by the base station for configuring uplink

The downlink control information or the high layer signaling of the resource or pattern or the parameter set required by the DMRS, and the uplink DMRS is sent according to the resource or pattern or parameter set required by the uplink DMRS configured by the base station. The technical solution provided by the present invention implements an uplink DMRS transmission mechanism with low time-frequency resource overhead, and solves the problem that the time-frequency resource overhead of the uplink demodulation reference signal is excessive. BRIEF abstract

1 is a schematic diagram of a conventional cyclic prefix in one slot of the related art;

2 is a schematic diagram of an extended cyclic prefix in one slot of the related art;

3 is a schematic diagram of a baseband signal processing of a physical uplink shared channel transmitted by a multi-antenna port in an LTE-A system of the related art;

4 is a schematic diagram of mapping of an uplink codeword to a layer of an LTE-A system according to the related art; FIG. 5 is a flow chart of a method for transmitting an uplink demodulation reference signal according to Embodiment 1 of the present invention;

6 is a schematic diagram of a time-frequency position in which an uplink DMRS sequence is placed;

Figure 7 is a schematic diagram of the time-frequency position where the uplink DMRS sequence is placed 2;

Figure 8 is a schematic diagram of the jump mode of the uplink DMRS 1;

Figure 9 is a schematic diagram of the jump mode of the uplink DMRS 2;

FIG. 10 is a schematic structural diagram of an apparatus for transmitting an uplink demodulation reference signal according to Embodiment 3 of the present invention; FIG.

FIG. 11 is a schematic structural diagram of still another apparatus for transmitting an uplink demodulation reference signal according to Embodiment 3 of the present invention. Preferred embodiment of the invention

In order to further enhance the urban outdoor scene using low power nodes, Small cell has been confirmed as

Rel-12 focuses on research objects. Small cells belong to nodes with low transmit power, and the cell radius is generally small, mainly considering the scenario of low-speed UEs. In low-speed scenarios, in order to improve uplink throughput, It can be considered to reduce the time-frequency resource overhead of the uplink DMRS. How to reduce overhead is a problem to be solved. An effective solution.

In order to solve the above problems, embodiments of the present invention provide a method, apparatus, and system for transmitting an uplink demodulation reference signal.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

Preferred embodiment 1

First, the first embodiment of the present invention will be described with reference to the accompanying drawings.

The embodiment of the present invention provides a method for transmitting an uplink demodulation reference signal, and the process for completing the uplink demodulation reference signal transmission using the method is as shown in FIG. 5, and includes:

Step 501: The base station configures, for the user equipment, a resource or a pattern or a parameter set required for sending the uplink DMRS.

In this step, the resource or pattern or parameter set includes: a time domain location, a frequency domain location, and a hopping mode.

Where the time domain location includes:

When the length of the uplink symbol cyclic prefix is a normal length, the time domain location is specifically: the first time slot of the subframe including the uplink DMRS and/or the fourth OFDM symbol of the second time slot; or, including the uplink DMRS The 7th OFDM symbol of the 1st slot of the subframe or the 1st OFDM symbol of the 2nd slot of the subframe;

When the uplink symbol cyclic prefix length is an extended length, the time domain position is specifically: a first time slot of a subframe including an uplink DMRS and/or a third OFDM symbol of a second time slot; or, including an uplink DMRS The sixth OFDM symbol of the first slot of the subframe or the first OFDM symbol of the second slot of the subframe.

The frequency domain location includes: all subcarriers or partial subcarriers of the bandwidth of the PUSCH where the uplink DMRS of the user terminal is located in the time domain location. For example, the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, for example, when the cyclic prefix length of the line symbol is a normal length, as shown in FIG. 6 Or as shown in Figure 7.

Jump methods include:

In the subframe n, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth; in the subframe n+1, the uplink DMRS sequence of the user terminal occupies the PUSCH bandwidth. The half-bandwidth subcarrier or the upper half of the bandwidth of the subcarrier; in the subframe n+2, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, and sequentially loops, for example, Figure 8 shows.

In the first time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth; in the second time slot of the subframe n, the user The uplink DMRS sequence of the terminal occupies the lower half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the upper half bandwidth. The configuration manner of the subframe n+1 is the same as that of the subframe n, and the loop jumps in sequence, as shown in FIG. 9.

Preferably, when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies a frequency domain position of a different bandwidth, the first DMRS symbol of the subframe n and the subframe n+1 are used by the OCC. One DMRS symbol is time-domain extended, and the second DMRS symbol of subframe n and the second DMRS symbol of subframe n+1 are time-domain-expanded using OCC.

Step 502: The base station sends or indicates, by using a bit field or a high layer signaling of the downlink control information, a resource or a pattern or a parameter set required for sending the uplink DMRS to the user terminal.

In this step, the base station configures at least one resource or pattern or parameter set required for sending the uplink DMRS for the user terminal by using the high layer signaling, and selects the at least one resource by using a bit field in the downlink control information or One of the patterns or parameter sets.

Preferably, the downlink control information includes downlink control information for scheduling a PUSCH or a PDSCH.

Step 503: The user terminal receives downlink control information or high layer signaling that is used by the base station to configure resources or patterns or parameter sets required for the uplink DMRS. Step 504: The user terminal sends an uplink DMRS according to a resource or a pattern or a parameter set required by the uplink DMRS configured by the base station.

Preferred embodiment two

Embodiment 2 of the present invention will be described below with reference to the accompanying drawings.

The base station configures the subframe configuration or period of the uplink DMRS for the user terminal through the high layer signaling, as shown in Table 2 or Table 3 or Table 4 below. Wherein, when the uplink DMRS subframe configuration index in Table 2 is 0, the period is 0.5, indicating that there are 2 DMRS time domain symbols in one subframe, and the time domain symbol position is in the Rel-8/9/lO/ll standard. The uplink DMRS time domain symbol positions are the same for the purpose of backward compatibility with Rel-8/9/lO/ll UEs. When the uplink DMRS subframe configuration index is 1, it indicates that there is only one uplink DMRS time domain symbol in one subframe; when the subframe configuration index is 2, it indicates that the uplink DMRS period is 2, and the offset is 0, indicating that the period is One subframe has DMRS, and the second subframe has no DMRS; other subframe configuration indexes of Table 1 can be deduced by analogy. The time domain location in the subframe includes: when the uplink symbol cyclic prefix length is a normal length, the time domain location is specifically: the first time slot of the subframe or the fourth OFDM symbol of the second time slot; or The 7th OFDM symbol of the 1st slot of the subframe or the 1st OFDM symbol of the 2nd slot of the subframe

When the uplink symbol cyclic prefix length is an extended length, the time domain position is specifically: the first time slot of the subframe or the third OFDM symbol of the second time slot; or, the first time slot of the subframe The first OFDM symbol of the second slot of 6 OFDM symbols or subframes.

For Tables 3 and 4, the two DMRS time domain symbols in the subframe are treated as a group. The time-frequency position of the DMRS in the subframe is the same as the uplink DMRS of Rel-8/9/lO/l. When the subframe configuration index is 0, it can be backward compatible with UEs of Rel-8/9/l 0/11. When the index is 1, the corresponding period is 2 and the subframe configuration offset is 0, indicating that there are two subframes in a period of one subframe, one uplink DMRS in the first subframe, and not in the second subframe. Other subframe configuration indexes can be deduced by analogy.

Table 2 Subframe configuration of uplink DMRS

0 0.5 ^DMRS

1 1 ^DMRS

2-3 2 ^DMRS― 2

4-7 4 ^DMRS ― 4

8-15 8 ^DMRS ― § Table 3 Uplink DMRS subframe configuration Uplink DMRS subframe configuration index Uplink DMRS period

Subframe offset (in subframes)

^DMRS (in subframes)

0 1 ^DMRS

1 -2 2 ^DMRS - 1

3-5 3 ^DMRS ― 3

6-9 4 ^DMRS ― 6

10-14 5 ^DMRS― 10

Table 4 Uplink DMRS subframe configuration Uplink DMRS subframe configuration index Uplink DMRS period

Subframe offset (in subframes)

^DMRS (in subframes)

0 1 ^DMRS

1 -2 2 ^DMRS - 1

3-6 4 ^DMRS ― 3

7- 14 8 ^DMRS ―

15-30 16 ^DMRS― 15 It should be noted that, in the specific implementation, it may also be extended according to the configuration rule of Table 2 or Table 3 or Table 4, or some of the configurations may be selected to generate a new subframe configuration table. The user terminal receives the high layer signaling sent by the base station, and sends the uplink DMRS according to the configuration.

Preferred embodiment three

The base station configures, by the higher layer signaling, at least one resource or pattern or parameter set required for transmitting the uplink DMRS, and selects one of the at least one resource or pattern or parameter set by using a bit field in the downlink control information.

The user terminal is specifically used as an example for the UE, and two DMRS patterns are configured for the UE. The first pattern is the same as the uplink DMRS pattern of the Rel-8/9/lO/11, and the purpose is to be backward compatible with the lower version UE. In the case of a regular CP, an uplink DMRS sequence is placed on all subcarriers of the 4th OFDM symbol of each slot of the subframe, and when the CP is extended, all the 3rd OFDM symbols in each slot of the subframe are added. The uplink DMRS sequence is placed on the carrier. The second pattern is the uplink DMRS pattern configured for the small cell or the NCT, and the uplink DMRS subframe configuration (such as Table 2) configured with the high layer signaling is configured to configure the uplink DMRS, and the time domain location of the DMRS is sent. Includes:

When the length of the uplink symbol cyclic prefix is normal, the time domain location is specifically as follows:

The first time slot of the subframe of the DMRS and/or the fourth OFDM symbol of the second time slot; or the seventh OFDM symbol or the subframe of the first time slot of the subframe including the uplink DMRS 1st OFDM symbol of 2 slots;

The frequency domain location includes: all subcarriers or partial subcarriers of the bandwidth of the PUSCH where the uplink DMRS of the user terminal is located in the time domain location. For example, the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth is as an example when the cyclic prefix length of the above line symbol is a normal length, as shown in FIG. 6 or FIG. 7.

The bit field in the downlink control information includes: a carrier indicator bit field, or a cyclic shift of the DMRS and an OCC index bit field, or a week for indicating the DMRS A bit field of a period or subframe configuration or subframe offset or pattern, or a bit field indicating the number of consecutively scheduled subframes.

The user terminal receives the downlink control information and/or the high layer signaling sent by the base station, and sends the uplink DMRS according to the configuration.

Preferred embodiment four

The embodiment of the present invention provides a method for transmitting an uplink demodulation reference signal, where the user equipment is specifically a UE, and the base station configures a transmission period and/or a subframe offset of the uplink DMRS for the UE, and uses a bit field of the downlink control information. Indicated to the UE as shown in Table 5 or Table 6 or Table 7.

Take Table 5 as an example. When the value of the bit field is 00, it indicates that the uplink DMRS period is 1, and each uplink subframe has two uplink DMRS time-domain OFDM symbols. The time domain location and the frequency domain location are all related to Rel-. The 8/9/lO/ll standard specifies the same; when the value of the bit field is 01, it indicates that the uplink DMRS period is 2, and if the subframe offset is 0, it indicates that the first subframe in the period contains 2 Or one uplink DMRS time domain OFDM symbol, and the second subframe in the period has no uplink DMRS time domain OFDM symbol. For the uplink DMRS of the first subframe, the specific time domain locations include:

When the uplink symbol cyclic prefix length is a normal length, the time domain position is specifically: the first time slot of the subframe and/or the fourth OFDM symbol of the second time slot; or, the first time slot of the subframe The 7th OFDM symbol or the 1st OFDM symbol of the 2nd slot of the subframe;

When the uplink symbol cyclic prefix length is an extended length, the time domain position is specifically: the first time slot of the subframe and/or the third OFDM symbol of the second time slot; or, the first time slot of the subframe The 6th OFDM symbol or the 1st OFDM symbol of the 2nd slot of the subframe.

The frequency domain location includes: all subcarriers or partial subcarriers of the bandwidth of the PUSCH where the uplink DMRS of the user terminal is located in the time domain location.

The value of the bit field, when 10, or 11, can be deduced by analogy. Table 6 and Table 7 are extended to 3 bits on the basis of Table 5 to indicate the period of the uplink DMRS, and the indication manner can be based on Table 5 and so on.

Preferably, the downlink control information includes: downlink control information for scheduling a physical uplink shared channel (PUSCH), a physical downlink shared channel (PDSCH), and scheduling a small cell. Downlink control information of the user terminal.

Preferably, the bit field in the downlink control information includes: a carrier indicator bit field, or a cyclic shift of the DMRS and an OCC index bit field, or is used to indicate a period or subframe configuration or a subframe offset of the DMRS. A bit field of a set or pattern, or a bit field indicating the number of consecutively scheduled subframes.

Upstream DMRS period/subframe offset indication

Period/subframe offset indication of the uplink DMRS

Preferably, the bit field for indicating a period or subframe configuration or a subframe offset or pattern of the uplink DMRS or a bit field for indicating the number of consecutively scheduled subframes is carried in a DCI Format field unique to the user. Or carried in the DCI Format field dedicated to the user terminal carrying the scheduled small cell.

The user terminal sends an uplink DMRS according to the configuration.

Preferred embodiment five

The base station configures, for the user equipment, a resource or a pattern or a parameter set required for transmitting the uplink demodulation reference signal, where the resource or pattern or parameter set includes:

Preferably, the bit field of the downlink control information indicates that the downlink control information scheduling is performed. The number of consecutive subframes of the user terminal (labeled M), as shown in Table 8 or Table 9 or Table 10:

Table 8: The number of consecutively scheduled subframes

Continuously scheduled number of subframes

The time domain location of the uplink DMRS is specifically:

The DMRS is on a first subframe and/or a last subframe and/or a ceil (M/2) subframe and/or a ceil (M/2) + 1 subframe of the one subframe, where , M is an integer, and ceil() means rounding up.

Preferably, the downlink control information includes: downlink control information for scheduling a physical uplink shared channel (PUSCH), a physical downlink shared channel (PDSCH), and downlink control information for a user terminal for scheduling a small cell.

Preferably, the bit field used to indicate the number of consecutively scheduled subframes is carried in a DCI Format domain that is specific to the user, or is carried in a DCI Format field dedicated to the user terminal that carries the scheduled small cell.

The user terminal sends an uplink DMRS according to the configuration.

Preferred embodiment six

An embodiment of the present invention provides an apparatus for transmitting an uplink demodulation reference signal, and the structure thereof is as shown in FIG. 10, including:

The configuration module 1001 is configured to configure, for the user equipment, a resource or a pattern or a parameter set required for sending the uplink DMRS, where the resource or the pattern or the parameter set includes:

The indicating module 1002 is configured to send the sending uplink by using downlink control information or high layer signaling.

The resources or patterns or parameter sets required by the DMRS are sent or indicated to the user terminal. The transmitting device of the uplink demodulation reference signal shown in FIG. 10 can be integrated in the base station, and the base station performs the corresponding function.

An embodiment of the present invention further provides an apparatus for transmitting an uplink demodulation reference signal, and the structure thereof is as shown in FIG.

The configuration receiving module 1101 is configured to receive downlink control information or high layer signaling that is used by the base station to configure a resource or a pattern or a parameter set required for the uplink DMRS, where the resource or the pattern or the parameter set includes:

The signal sending module 1102 is configured to send an uplink DMRS according to a resource or a pattern or a parameter set required by the uplink DMRS configured by the base station.

The transmitting device of the uplink demodulation reference signal shown in FIG. 11 can be integrated in the user equipment, and the corresponding function is performed by the user equipment.

The embodiment of the present invention further provides a transmitting system for an uplink demodulation reference signal, including a base station and a user equipment therebelow, where the base station includes an uplink demodulation reference signal transmitting apparatus shown in FIG. a transmitting device including the uplink demodulation reference signal shown in FIG. 11;

The base station is configured to configure, for the user equipment, a resource or a pattern or a parameter set required for sending an uplink DMRS, and send the resource or a pattern or a parameter set required for sending the uplink DMRS by using downlink control information or high layer signaling. Or indicating to the user terminal, the resource or pattern or parameter set includes:

The user terminal is configured to receive downlink control information or high layer signaling that is used by the base station to configure a resource or a pattern or a parameter set required for an uplink DMRS, and according to resources required for the uplink DMRS configured by the base station, or A pattern or parameter set that sends an upstream DMRS.

Preferably, when the downlink control information is used to schedule the user terminal in consecutive M subframes, the time domain location of the uplink DMRS is specifically: The DMRS is on a first subframe and/or a last subframe and/or a ceil (M/2) subframe and/or a ceil (M/2) + 1 subframe of the M subframes, where , M is an integer, and ceil() means rounding up.

Preferably, when the uplink symbol cyclic prefix length is a normal length, the time domain position is specifically: a first time slot of a subframe including an uplink DMRS and/or a fourth OFDM symbol of a second time slot, or ,

Preferably, when the uplink symbol cyclic prefix length is an extended length, the time domain position is specifically: a first time slot of a subframe including an uplink DMRS and/or a third OFDM symbol of a second time slot, or ,

Preferably, the frequency domain location includes:

Preferably, the jumping manner includes:

Preferably, the jumping manner includes: In the first time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, where n is an integer.

Preferably, the base station sends the resource or the pattern or the parameter set required for sending the uplink DMRS to the user terminal by using the downlink control information or the high layer signaling, specifically:

Preferably, the bit field in the downlink control information includes:

An embodiment of the present invention provides a method, an apparatus, and a system for transmitting an uplink demodulation reference signal. The base station configures, for a user terminal, a resource or a pattern or a parameter set required for transmitting an uplink DMRS, and indicates by using downlink control information or high layer signaling. Sending, to the user terminal, the resource or the pattern or the parameter set required for sending the uplink DMRS, where the resource or the pattern or the parameter set includes: a time domain location, a frequency domain location, a subframe configuration or a period, and a jump mode; Receiving, by the user equipment, downlink control information or high layer signaling, which is used by the base station to configure resources or patterns or parameter sets required for the uplink DMRS, and according to resources or patterns or parameter sets required for the uplink DMRS configured by the base station, Send the upstream DMRS. The technical solution provided by the present invention implements an uplink DMRS sending mechanism with low time-frequency resource overhead, and solves the problem. The problem that the time-frequency resource overhead of the uplink demodulation reference signal is too large. In the embodiment of the present invention, the base station configures multiple uplink DMRS resources or patterns or parameter sets for the user terminal by using downlink control information or high layer signaling, and dynamically selects multiple resources or one of the patterns or parameter sets through the downlink control information. The base station can dynamically configure the uplink DMRS for the UE according to the scenario in which the UE is located, which saves the overhead of the uplink DMRS, thereby improving the transmission performance of the system.

It will be understood by those skilled in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any particular combination of hardware and software.

The various devices/function modules/functional units in the above embodiments may be implemented using a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

Each device/function module/functional unit in the above embodiments can be stored in a computer readable storage medium when implemented in the form of a software function module and sold or used as a standalone product. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

It is to be understood by those skilled in the art that variations or substitutions are within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Industrial Applicability In the embodiment of the present invention, a base station configures a resource or a pattern or a parameter set of multiple uplink DMRSs for a user terminal by using downlink control information or high layer signaling, and dynamically selects multiple resources or patterns or parameter sets by using downlink control information. The base station can dynamically configure the uplink DMRS for the UE according to the scenario in which the UE is located, thereby saving the overhead of the uplink DMRS, thereby improving the transmission performance of the system.

•6匕

dagger.

Claims

Claim

1. A method for transmitting an uplink demodulation reference signal, comprising:

The base station configures, for the user equipment, a resource or pattern or parameter set required to transmit an uplink demodulation reference signal (DMRS), the resource or pattern or parameter set including:

The method for transmitting an uplink demodulation reference signal according to claim 1, wherein when the downlink control information is used to schedule the user terminal in consecutive M subframes, the time domain location of the uplink DMRS is:

The method for transmitting an uplink demodulation reference signal according to claim 1 or 2, wherein when the uplink symbol cyclic prefix length is a normal length, the time domain position is:

The first time slot of the subframe including the uplink DMRS and/or the fourth orthogonal frequency division multiplexing (OFDM) symbol of the second time slot, or

The method for transmitting an uplink demodulation reference signal according to claim 1 or 2, wherein when the uplink symbol cyclic prefix length is an extended length, the time domain position is:

The first OFDM symbol of the subframe including the uplink DMRS and/or the third OFDM symbol of the second slot, or

The method for transmitting an uplink demodulation reference signal according to claim 1, wherein the frequency is The domain location includes:

The method for transmitting an uplink demodulation reference signal according to claim 1, wherein the subframe configuration or period comprises:

The method for transmitting an uplink demodulation reference signal according to claim 1, wherein the jumping mode comprises:

The method for transmitting an uplink demodulation reference signal according to claim 1, wherein the base station sends the resource or pattern or parameter set required for sending the uplink DMRS by using a bit field or higher layer signaling of downlink control information. Or indicate to the user terminal:

The base station configures, by using the high layer signaling, at least one required for sending the uplink DMRS for the user terminal. a resource or a pattern or a set of parameters, and selecting one of the at least one resource or pattern or parameter set by a bit field in the downlink control information.

The method for transmitting an uplink demodulation reference signal according to claim 1 or 9, wherein the downlink control information includes downlink control information for scheduling a PUSCH or for scheduling a physical downlink shared channel (PDSCH) or for Downlink control information of a user terminal that schedules a small cell.

The method for transmitting an uplink demodulation reference signal according to claim 1 or 9, wherein the bit field in the downlink control information comprises:

The method for transmitting an uplink demodulation reference signal according to claim 11, wherein the bit field for indicating a period or subframe configuration or a subframe offset or pattern of an uplink DMRS and the indication for continuous The bit field of the number of scheduled subframes is carried in the user-specific DCI Format field or in the DCI Format field dedicated to the user terminal carrying the scheduled small cell.

The method for transmitting an uplink demodulation reference signal according to claim 1, wherein: when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies a frequency domain position of the same bandwidth, The intersection mask (OCC) performs time domain expansion on the two DMRS symbols.

The method for transmitting an uplink demodulation reference signal according to claim 13, wherein the using the OCC to perform time domain expansion on the two DMRS symbols is:

When the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies frequency domain positions of different bandwidths, the first DMRS symbol of the subframe n and the first DMRS of the subframe n+1 are used by the OCC. The symbol performs time domain expansion, and the second DMRS symbol of the subframe n and the second DMRS symbol of the subframe n+1 are time-domain-expanded using the OCC.

15. A method for transmitting an uplink demodulation reference signal, comprising:

The user terminal receives the bit field or higher layer signaling of the downlink control information of the resource or the pattern or the parameter required for the configuration of the uplink DMRS, and the resource or the pattern or the parameter set includes: the time domain location, the frequency domain location, and the sub-location. Frame configuration or period, jump mode;

The user terminal sends an uplink DMRS according to resources or patterns or parameters required for the uplink DMRS configured by the base station.

The method for transmitting an uplink demodulation reference signal according to claim 15, wherein when the downlink control information schedules the user terminal in consecutive M subframes, the time domain location of the uplink DMRS is:

The method for transmitting an uplink demodulation reference signal according to claim 15 or 16, wherein when the uplink symbol cyclic prefix length is a normal length, the time domain position is:

The first OFDM symbol of the subframe including the uplink DMRS and/or the fourth OFDM symbol of the second slot, or

The method for transmitting an uplink demodulation reference signal according to claim 15 or 16, wherein when the uplink symbol cyclic prefix length is an extended length, the time domain position is:

The method for transmitting an uplink demodulation reference signal according to claim 15, wherein the frequency domain location comprises: All subcarriers or partial subcarriers of the bandwidth of the PUSCH in the time domain location of the uplink DMRS of the user terminal.

The method for transmitting an uplink demodulation reference signal according to claim 15, wherein the subframe configuration or period comprises:

The method for transmitting an uplink demodulation reference signal according to claim 15, wherein the jump mode comprises:

The method for transmitting an uplink demodulation reference signal according to claim 15, wherein: when the uplink DMRS occupies two time domain OFDM symbols in one subframe and the uplink DMRS sequence occupies a frequency domain position of the same bandwidth, the OCC is used. Time domain expansion of the two DMRS symbols.

The method for transmitting an uplink demodulation reference signal according to claim 23, wherein The time domain extension of the two DMRS symbols using OCC is:

The method for transmitting an uplink demodulation reference signal according to claim 15, wherein the downlink control information of the user terminal of the small cell is scheduled.

The method for transmitting an uplink demodulation reference signal according to claim 15, wherein the bit field in the downlink control information comprises:

The method for transmitting an uplink demodulation reference signal according to claim 26, wherein the bit field for indicating a period or subframe configuration or a subframe offset or pattern of an uplink DMRS and the indication for continuous The bit field of the number of scheduled subframes is carried in the user-specific DCI Format field or in the DCI Format field dedicated to the user terminal carrying the scheduled small cell.

28. A transmitting device for an uplink demodulation reference signal, comprising:

29. A transmitting device for an uplink demodulation reference signal, comprising:

Configure the receiving module, set to: Receive the resources required by the base station to configure the uplink DMRS. Downstream control information or high layer signaling of a source or a pattern or a parameter set, where the resource or pattern or parameter set includes:

30. A transmission system for an uplink demodulation reference signal, comprising: a base station and a user equipment therebelow; the base station is configured to: configure, for the user equipment, a resource or a pattern or a parameter set required for sending an uplink DMRS, and pass The bit field or the high layer signaling of the downlink control information sends or indicates to the user terminal the resource or the pattern or parameter set required for sending the uplink DMRS, where the resource or the pattern or the parameter set includes:

The user terminal is configured to: receive downlink control information or high layer signaling that is used by the base station to configure resources or patterns or parameter sets required for uplink DMRS, and select resources according to uplink DMRS configured by the base station. Or the pattern or parameter set, send the upstream DMRS.

The transmitting system of the uplink demodulation reference signal according to claim 30, wherein when the downlink control information schedules the user terminal in consecutive M subframes, the time domain location of the uplink DMRS is:

The transmitting system of the uplink demodulation reference signal according to claim 30 or 31, wherein when the uplink symbol cyclic prefix length is a normal length, the time domain position is:

The seventh OFDM symbol of the first slot of the subframe including the uplink DMRS or the first OFDM symbol of the second slot of the subframe.

The transmitting system of the uplink demodulation reference signal according to claim 30 or 31, wherein when the uplink symbol cyclic prefix length is an extended length, the time domain position is:

The transmitting system of the uplink demodulation reference signal according to claim 30, wherein the frequency domain location comprises:

All subcarriers or partial subcarriers of the bandwidth of the PUSCH where the uplink DMRS of the user terminal is located in the time domain location.

The transmitting system of the uplink demodulation reference signal according to claim 30, wherein the subframe configuration or period comprises:

The transmitting system of the uplink demodulation reference signal according to claim 30, wherein the jumping mode comprises:

The system for transmitting an uplink demodulation reference signal according to claim 30, wherein the jump mode comprises:

In the first time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the upper half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the lower half bandwidth, where n is an integer. In the second time slot of the subframe n, the uplink DMRS sequence of the user terminal occupies the lower half bandwidth subcarrier of the PUSCH bandwidth or the subcarrier of the upper half bandwidth.

The transmitting system of the uplink demodulation reference signal according to claim 30, wherein the base station is configured to: indicate, by using downlink control information or higher layer signaling, a resource or a pattern or a parameter set required for sending the uplink DMRS. Send to the user terminal as:

The transmitting system of the uplink demodulation reference signal according to claim 30 or 38, wherein the downlink control information of the user terminal for scheduling the small cell is used.

The transmitting system of the uplink demodulation reference signal according to claim 30 or 38, wherein the bit field in the downlink control information comprises:

The transmitting system of the uplink demodulation reference signal according to claim 40, wherein the bit field for indicating a period or subframe configuration or a subframe offset or pattern of the uplink DMRS and the indicating for continuous The bit field of the number of scheduled subframes is carried in the user-specific DCI Format field or in the DCI Format field dedicated to the user terminal carrying the scheduled small cell.