Nothing Special   »   [go: up one dir, main page]

CN104144504A - Transmission method, device and system for downlink reference signal - Google Patents

Transmission method, device and system for downlink reference signal Download PDF

Info

Publication number
CN104144504A
CN104144504A CN201310172578.0A CN201310172578A CN104144504A CN 104144504 A CN104144504 A CN 104144504A CN 201310172578 A CN201310172578 A CN 201310172578A CN 104144504 A CN104144504 A CN 104144504A
Authority
CN
China
Prior art keywords
reference signal
subframes
downlink reference
subframe
radio frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310172578.0A
Other languages
Chinese (zh)
Inventor
苟伟
韩晓钢
左志松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CN201310172578.0A priority Critical patent/CN104144504A/en
Priority to PCT/CN2014/076366 priority patent/WO2014180265A1/en
Publication of CN104144504A publication Critical patent/CN104144504A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a transmission method for a downlink reference signal. The method includes the steps that a subframe pattern transmitted by the downlink reference signal and a transmission bandwidth of the downlink reference signal are determined through a network side according to the system bandwidth of a carrier; the downlink reference signal is transmitted through the network side in the determined transmission bandwidth according to the determined subframe pattern. The invention further discloses a transmission device and system for the downlink reference signal. By the adoption of the method, device and system, the downlink reference signal can be transmitted in a new carrier.

Description

Transmission method, device and system for downlink reference signal
Technical Field
The present invention relates to Long Term Evolution (LTE) technologies, and in particular, to a method, device, and system for transmitting downlink reference signals.
Background
With the development of the mobile communication industry and the increasing demand for mobile data services, the demand for mobile communication rate and Quality of Service (QoS) is higher, and therefore, before the third Generation (3G, 3rd-Generation) technology is not yet commercialized in a large scale, research and development work on the next Generation mobile communication system has been started, wherein the LTE Project initiated by the third Generation Partnership Project (3 GPP), and the highest spectrum bandwidth which can be provided by the LTE system is 20 MHz. With the further evolution of the network, the LTE20 system, as an evolution system of the LTE system, can provide a spectrum bandwidth up to 100MHz and support more flexible and higher-quality communication, and meanwhile, the LTE20 system has good backward compatibility.
In the LTE20 system, a LTE20 terminal with high capability can simultaneously perform data transmission on multiple Component Carriers (CCs), which is called a multi-Carrier aggregation technique. By adopting the multi-carrier aggregation technology, the purpose of improving the bandwidth can be achieved. In the original LTE system, an LTE terminal can only operate on a certain CC that is backward compatible, that is: an LTE terminal can only transmit data on one CC. Here, the LTE20 terminal refers to: a terminal with LTE20 module, i.e. a terminal with LTE20 release.
In the LTE20 system, a base station belongs to a maximum of 5 CCs, and each of the 5 CCs is a carrier with backward compatibility to support a User Equipment (UE) of an initial LTE release to work. The base station can configure a plurality of CCs for one UE, and selects part or all of the configured CCs to activate for the UE, and the activated CCs can provide data transmission for the UE.
In the current stage of research, on the basis of a multi-carrier aggregation technology, the LTE R11 stage puts new demands on spectrum resource utilization, network energy saving, and inter-cell interference suppression. To achieve this, a New Carrier (New Carrier Type) technology is proposed, which is applied by means of a Carrier aggregation technology, and a clear feature of adopting the New Carrier Type technology is that backward compatibility is not required to be considered in designing, and more New technologies can be applied in the New Carrier Type technology. For example, the current definition for New Carrier Type in LTE R12 is: the Cell-specific Reference Signals (CRS) of LTE R8 need not be configured in the New Carrier Type to avoid the serious CRS interference of neighboring cells at the Cell edge, especially the CRS interference between macro Cell and micro Cell in Heterogeneous Network (HetNet) scenario. However, the CRS without LTE R8 configured in the New Carrier Type faces a problem that no reference signal capable of being used for synchronization tracking can be used in the New Carrier Type.
Disclosure of Invention
In view of this, the present invention provides a method, a device, and a system for transmitting a downlink reference signal, which can implement transmission of the downlink reference signal in a New Carrier Type.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for sending a downlink reference signal, which comprises the following steps:
the network side determines a subframe pattern transmitted by a downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier;
and the network side transmits the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
In the above scheme, the determining, by the network side, the subframe pattern transmitted by the downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier includes:
when the system bandwidth of a carrier is greater than M Physical Resource Block (PRB) pairs, the network side determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is M PRB pairs; or,
when the system bandwidth of the carrier is greater than N PRB pairs and less than or equal to M PRB pairs, the network side determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs, the network side determines that the subframe pattern is subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs and when the system bandwidth is in a Frequency Division Duplex (FDD) mode, the network side determines subframe patterns as subframes #0, #4, #5, and #9 in a radio frame; when the system bandwidth of the carrier is equal to N PRB pairs and in a Time Division Duplex (TDD) mode, the network side determines subframe patterns as subframes #0, #1, #5, and #6 in a radio frame and determines that a transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or,
and when the system bandwidth of the carrier is equal to the N PRB pairs, the network side determines that the subframe patterns are distributed according to the 2ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier.
In the above scheme, the value of M is 25, and the value of N is 6.
In the above scheme, when the subframe pattern is determined to be subframes #0, #1, #5 and #6 in a radio frame, or subframes #1, #2, #6 and #7 in a radio frame, or subframes #2, #3, #7 and #8 in a radio frame, or subframes #3, #4, #8 and #9 in a radio frame, the network side preferentially selects a subframe pattern in which all subframes in the subframe pattern are downlink subframes as the determined subframe pattern.
In the foregoing scheme, the downlink subframe includes a special subframe in a TDD mode.
In the above scheme, when the network side determines that the subframe patterns are subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and when the network side needs to select only one subframe pattern for use, the preferred subframe pattern of the network side is: subframes #0, #1, #5, and #6 in the radio frame.
In the above scheme, the determining that the transmission bandwidth is M PRB pairs includes:
and determining M PRB pairs with continuous transmission bandwidth in the middle of the system bandwidth of the carrier.
In the above scheme, the determining subframe patterns are distributed according to a 5ms period, and the determining subframe patterns are:
the subframe pattern is determined to be subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame.
In the above scheme, when determining that the subframe patterns are subframes #0 and #5 in a radio frame, or subframes #1 and #6 in a radio frame, or subframes #2 and #7 in a radio frame, or subframes #3 and #8 in a radio frame, or subframes #4 and #9 in a radio frame, and when the network side needs to select only one subframe pattern for use, the preferred subframe pattern of the network side is: subframes #0 and # 5.
In the above scheme, when the network side selects multiple subframe patterns for use, the method further includes:
and the network side configures and sends indication information used for indicating a subframe pattern sent by the downlink reference signal in a receiving end carrier in system information block (MIB) information or other high-level signaling except the MIB information.
In the above scheme, the downlink reference signal is a synchronization tracking reference signal or a synchronization reference signal used for a receiving end to perform synchronization tracking with a carrier, or a cell-specific reference signal (CRS) of a port 0 specified by the LTE R8 standard, or a channel state indication reference signal (CSI-RS) or a common demodulation reference signal (DMRS) mapped and transmitted on a common port in an LTE system, or the downlink reference signal is used for Radio Resource Management (RRM) measurement.
In the foregoing solution, before sending the downlink reference signal, the method further includes:
the network side generates a sequence of the downlink reference signal according to the maximum system bandwidth supported by the LTE system;
intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal, and taking the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth as the sequence of the downlink reference signal; or,
the network side generates a sequence of the downlink reference signal according to the system bandwidth of the current carrier supported by the LTE system, and the sequence is used as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth; or,
and the network side generates a sequence of the downlink reference signal according to the determined transmission bandwidth, and the sequence is used as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth.
In the foregoing solution, when the downlink reference signal is sent, the method further includes:
and the network side sends a subframe offset parameter used for indicating the position of the initial subframe of the sent downlink reference signal in a wireless frame.
In the above scheme, when the determined subframe patterns are distributed according to a 5ms period, the value ranges of the subframe offset parameters are 0, 1, 2, 3 and 4;
and when the determined subframe patterns are distributed according to the 2ms period, the value range of the subframe offset parameter is 0 and 1.
When the determined subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, the subframe offset parameter value range is 0, 1, 2, 3.
The invention also provides a method for receiving the downlink reference signal, which comprises the following steps:
the receiving end determines a subframe pattern transmitted by a downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier;
and the receiving end receives the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
In the above scheme, the determining, by the receiving end, the subframe pattern transmitted by the downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier includes:
when the system bandwidth of the carrier is greater than M PRB pairs, the receiving end determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is M PRB pairs; or,
when the system bandwidth of the carrier is greater than N PRB pairs and less than or equal to M PRB pairs, the receiving end determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs, the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs and in FDD mode, the receiving end determines subframe patterns as subframes #0, #4, #5, and #9 in a radio frame; when the system bandwidth of the carrier is equal to the N PRB pairs and in a TDD mode, the receiving end determines subframe patterns as subframes #0, #1, #5 and #6 in a wireless frame and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to the N PRB pairs, the receiving end determines that the subframe patterns are distributed according to the 2ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier.
In the above scheme, when the subframe pattern is determined to be subframes #0, #1, #5 and #6 in a radio frame, or subframes #1, #2, #6 and #7 in a radio frame, or subframes #2, #3, #7 and #8 in a radio frame, or subframes #3, #4, #8 and #9 in a radio frame, the receiving end and the network side agree in advance to preferentially select a subframe pattern in which all subframes in the subframe pattern are downlink subframes as the determined subframe pattern.
In the above scheme, when the receiving end determines that the subframe patterns are subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and when the receiving end and the network side have a predetermined requirement for selecting only one subframe pattern for use, the receiving end preferably selects the subframe pattern as follows: subframes #0, #1, #5, and # 6.
In the above scheme, the subframe patterns are determined to be subframes #0 and #5 in a radio frame, or subframes #1 and #6 in a radio frame, or subframes #2 and #7 in a radio frame, or subframes #3 and #8 in a radio frame, or subframes #4 and #9 in a radio frame, and when the receiving end and the network side agree in advance that only one subframe pattern needs to be selected for use, the subframe pattern preferred by the receiving end is: subframes #0 and # 5.
In the above scheme, when the network side selects multiple subframe patterns for use, the method further includes:
and the receiving end determines the subframe pattern used for transmitting the downlink reference signal according to the received MIB information or indication information which is configured in other high-level signaling except the MIB information and used for indicating the subframe pattern transmitted by the downlink reference signal in the carrier wave of the receiving end.
In the above scheme, the sequence of the received downlink reference signal is: generating a sequence of the downlink reference signal according to the maximum bandwidth supported by an LTE system, and intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal; or a sequence of the downlink reference signal generated according to the system bandwidth of the current carrier supported by the LTE system; or a sequence of the downlink reference signal generated according to the determined transmission bandwidth.
In the above scheme, the method further comprises:
and the receiving end determines the initial subframe position of the received downlink reference signal in a wireless frame according to the received subframe offset parameter.
The present invention further provides a device for transmitting downlink reference signals, including: the device comprises a first determining module and a sending module; wherein,
a first determining module, configured to determine, according to a system bandwidth of a carrier, a subframe pattern sent by a downlink reference signal and a sending bandwidth of the downlink reference signal, and send the determined subframe pattern and the determined sending bandwidth to the sending module 32;
and the sending module is used for sending the downlink reference signal in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the first determining module.
In the foregoing solution, the sending module is further configured to generate a sequence of the downlink reference signal according to a maximum system bandwidth supported by an LTE system before sending the downlink reference signal; intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal, and taking the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth as the sequence of the downlink reference signal; or generating a sequence of the downlink reference signal according to a system bandwidth of a current carrier supported by an LTE system, as the sequence of the downlink reference signal transmitted in a PRB pair corresponding to the determined transmission bandwidth; or generating a sequence of the downlink reference signal according to the determined transmission bandwidth, as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth; and/or the subframe offset parameter is used for indicating the starting subframe position of the transmitted downlink reference signal in a radio frame.
The invention also provides a receiving device of the downlink reference signal, which comprises: a second determining module and a receiving module; wherein,
the second determining module is used for determining a subframe pattern sent by the downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the receiving module;
and the receiving module is used for receiving the downlink reference signal in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the second determining module.
In the foregoing solution, the receiving module is further configured to determine, according to the subframe offset parameter of the received subframe, a starting subframe position of the received downlink reference signal in a radio frame.
The invention also provides a transmission system for transmitting the downlink reference signal, which comprises: a transmitting device and a receiving device; the transmitting apparatus further includes: the device comprises a first determining module and a sending module; the receiving apparatus further includes: a second determining module and a receiving module; wherein,
the first determining module is used for determining a subframe pattern sent by a downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the sending module;
a sending module, configured to send the downlink reference signal to the receiving device in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the first determining module;
the second determining module is used for determining a subframe pattern sent by the downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the receiving module;
and the receiving module is configured to receive the downlink reference signal sent by the sending device in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the second determining module.
According to the transmission method, the transmission equipment and the transmission system of the downlink reference signal, a network side determines a subframe pattern sent by the downlink reference signal and the sending bandwidth of the downlink reference signal according to the system bandwidth of a carrier; the network side sends the downlink reference signal in the determined sending bandwidth according to the determined subframe pattern; correspondingly, the receiving end determines the subframe pattern sent by the downlink reference signal and the sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier; and the receiving end receives the downlink reference signal in the determined sending bandwidth according to the determined subframe pattern, so that the transmission of the downlink reference signal can be realized in the New Carrier Type.
In addition, the scheme provided by the invention is suitable for the transmission of the synchronous tracking reference signal, and is particularly suitable for the transmission of the synchronous tracking reference signal of a communication system with a system bandwidth with various carriers. That is to say, the downlink reference signal transmitted by the method of the present invention can be used for synchronous tracking, and the performance can be ensured.
In addition, the scheme provided by the invention can weaken the interference of the existing LTE R8CRS in the HetNet scene to a certain extent, and can also enable the UE to use the downlink reference signal.
Drawings
Fig. 1 is a flowchart illustrating a method for transmitting a downlink reference signal according to the present invention;
fig. 2 is a schematic flow chart of a method for receiving a downlink reference signal according to the present invention;
fig. 3a-3d are performance graphs of synchronous tracking simulation of downlink reference signals transmitted by the method of the present invention when the system bandwidth of the carrier is 6 PRB pairs;
fig. 4 is a schematic structural diagram of a device for transmitting downlink reference signals according to the present invention;
fig. 5 is a schematic structural diagram of a receiving device of a downlink reference signal according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the method for transmitting a downlink reference signal of the present invention includes the following steps:
step 101: the network side determines a subframe pattern transmitted by a downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier;
here, the network side refers to a network side device, and is preferably a base station.
The concrete realization of this step includes:
when the system bandwidth of the carrier is greater than M PRB pairs, the network side determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is M PRB pairs; or,
when the system bandwidth of the carrier is greater than N PRB pairs and less than or equal to M PRB pairs, the network side determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs, the network side determines that the subframe pattern is subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs and in an FDD mode, the network side determines subframe patterns as subframes #0, #4, #5 and #9 in a radio frame; when the system bandwidth of the carrier is equal to the N PRB pairs and in a TDD mode, the network side determines subframe patterns as subframes #0, #1, #5 and #6 in a radio frame and determines a transmission bandwidth as the PRB pair corresponding to the system bandwidth of the carrier; or,
and when the system bandwidth of the carrier is equal to the N PRB pairs, the network side determines that the subframe patterns are distributed according to the 2ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier.
Through a large number of simulation experiments, preferably, for the LTE system, the values of M and N are 25 and 6, respectively. When the subframe pattern is determined to be subframes #0, #1, #5 and #6 in a radio frame, or subframes #1, #2, #6 and #7 in a radio frame, or subframes #2, #3, #7 and #8 in a radio frame, or subframes #3, #4, #8 and #9 in a radio frame, the subframe pattern in which all subframes are downlink subframes is preferentially selected as the determined subframe pattern.
When the system bandwidth of the carrier is equal to N PRB pairs, the network side determines the subframe pattern to be subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame according to:
firstly, a determined subframe pattern adopts two continuous subframes which are equally spaced, and the two continuous subframes are beneficial to synchronous tracking, specifically, in the two continuous subframes, the time deviation and the frequency deviation which can be generated by signals are very limited, so that the average can be carried out when the downlink reference signals in the two continuous subframes are used for synchronous tracking, the synchronous tracking performance is improved, and the method is particularly suitable for synchronous tracking under high-speed movement of a receiving end;
secondly, in the LTE system, when the LTE system is in TDD mode, four subframes in the subframe pattern may be configured as paging subframes, and regardless of whether the LTE system is in TDD mode or FDD mode, subframes #0 and #5 are used to carry system information and PSS/SSS, and these subframes do not carry multicast physical channel (PMCH), so the subframe carrying the downlink reference signal does not collide with the subframe carrying the PMCH.
When the system bandwidth of the carrier is equal to N PRB pairs, the network determines subframe patterns as subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, when the network needs to select only one subframe pattern for use, the preferred subframe pattern is: subframes #0, #1, #5, and # 6.
When the system bandwidth of the carrier is equal to N PRB pairs and in an FDD mode, the network side determines subframe patterns as subframes #0, #4, #5 and #9 in a radio frame; when in TDD mode, the basis for the network side to determine the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame is:
the subframes in the determined subframe pattern are all potential paging subframes and do not bear the PMCH, so the subframe bearing the downlink reference signal does not collide with the subframe bearing the PMCH, thereby ensuring that the downlink reference signal is normally sent in a mixed carrier wave of Multimedia Broadcast Multicast Service (MBMS) and unicast service in subframe time division multiplexing, and the subframe bearing the downlink reference signal does not collide with a multicast single frequency network (MBSFN) subframe.
The PRB pair refers to a PRB pair conforming to the definition of a PRB pair in LTE 36.211; further, the PRB pair includes a PRB pair composed of all downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols in a special subframe of the TDD mode.
The determining that the transmission bandwidth is M PRB pairs specifically includes:
and determining M PRB pairs with continuous transmission bandwidth in the middle of the system bandwidth of the carrier.
The determining subframe patterns are distributed according to a 5ms period, and specifically include:
the subframe pattern is determined to be subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame.
Here, when determining that the subframe patterns are subframes #0 and #5 in a radio frame, or subframes #1 and #6 in a radio frame, or subframes #2 and #7 in a radio frame, or subframes #3 and #8 in a radio frame, or subframes #4 and #9 in a radio frame, when the network side needs to select only one subframe pattern for use, the preferred subframe patterns are: subframes #0 and # 5.
The subframes #1, #2, #3, #4, #5, #6, #7, #8, and #9 are numbers of subframes in a radio frame, and specifically, the subframe #1 is a subframe number 1 in the radio frame, the subframe #2 is a subframe number 2 in the radio frame, and so on.
And for the LTE system, when the network side selects multiple subframe patterns for use, the method may further include:
and the network side configures indication information for indicating the subframe pattern transmitted by the downlink reference signal in the carrier of the receiving end in MIB information or other high-level signaling except the MIB information and transmits the indication information so that the receiving end can determine the specific subframe pattern to use according to the subframe pattern information. Here, the other higher layer signaling may be a system information block (SIBx).
The downlink reference signal may be a synchronization tracking reference signal or a synchronization reference signal used for a receiving end to perform synchronization tracking with a carrier. Here, fig. 3a to 3d are tracking performance curves of synchronization tracking reference signals transmitted by a simulation carrier with a system bandwidth equal to 6 PRB pairs in a subframe pattern of 1ms period distribution, 5ms period distribution, and subframes #0, #1, #5, and #6, and subframes #0, #4, #5, and #9, respectively; as can be seen from fig. 3a to 3d, the tracking performance of the downlink reference signal transmitted by the method of the present invention can be ensured. The tracking performance curve of the synchronous tracking reference signal which is distributed and sent according to the period of 1ms by adopting the subframe pattern is the technical scheme adopted in the prior art; when simulation is carried out, the signal-to-noise ratio (SNR) of an Enhanced Typical Urban (ETU) channel (channel) is-8 db, and a receiving end is UE; in fig. 3a to 3d, a thick solid line represents a tracking performance curve corresponding to the subframe pattern distributed according to the 1ms period, and a thick two-dot chain line represents a tracking performance curve corresponding to the subframe pattern distributed according to the 5ms period; the thin solid line represents the tracking performance curves corresponding to the subframe patterns of the subframes #0, #1, #5, and #6, and the thin dotted line represents the tracking performance curves corresponding to the subframe patterns of the subframes #0, #4, #5, and # 9; in fig. 3a, 3b, the speed of the UE is 3 km/h, and in fig. 3c, 3d, the speed of the UE is 120 km/h.
The downlink reference signal may also be a CRS of port 0 specified by the LTE R8 standard.
The downlink reference signal can also be a CSI-RS or a common DMRS which is mapped and transmitted at a common port in an LTE system; here, the present invention also performs a simulation experiment on the performance of the existing CSI-RS and DMRS for synchronization tracking, and obtains a certain gain, so that the downlink reference signal is the CSI-RS mapped and transmitted at the common port in the LTE system. The common port refers to a port that can be received by all receiving terminals in a cell, in other words, the CSI-RS mapped and sent at the common port in the LTE system is a CSI-RS specific to the cell, that is, a CSI-RS specific to a UE in the current LTE system. Correspondingly, the downlink reference signal may also be a DMRS sent in an LTE system according to common precoding mapping, that is, the downlink reference signal is a common DMRS. The common precoding refers to precoding that can be known by all receiving terminals in a cell, that is, a DMRS specific to a UE in an LTE system at present.
The downlink reference signals may also be used for RRM measurements.
Step 102: and the network side transmits the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
Here, before transmitting the downlink reference signal, the method may further include:
the network side generates a sequence of the downlink reference signal according to the maximum system bandwidth supported by the LTE system;
intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal, and taking the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth as the sequence of the downlink reference signal; or,
the network side generates a sequence of the downlink reference signal according to the system bandwidth of the current carrier supported by the LTE system, and the sequence is used as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth; or,
and the network side generates a sequence of the downlink reference signal according to the determined transmission bandwidth, and the sequence is used as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth.
When generating the sequence of the downlink reference signal, the sequence of the downlink reference signal is calculated as follows: first, c is calculated using formula (1)initValue of (a), in the formula at the time of calculationThe parameters all use the parameters of the new carrier; here, if the new carrier does not have its own independent virtual cell Identification (ID), the physical cell ID of the compatible carrier paired with the new carrier is used.
<math> <mrow> <msub> <mi>c</mi> <mi>init</mi> </msub> <mo>=</mo> <msup> <mn>2</mn> <mn>10</mn> </msup> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <mn>7</mn> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>+</mo> <mi>l</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>&CenterDot;</mo> <msubsup> <mi>N</mi> <mi>ID</mi> <mi>cell</mi> </msubsup> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>+</mo> <mn>2</mn> <mo>&CenterDot;</mo> <msubsup> <mi>N</mi> <mi>ID</mi> <mi>cell</mi> </msubsup> <mo>+</mo> <msub> <mi>N</mi> <mi>CP</mi> </msub> <mo>,</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </math>
Wherein n issDenotes a slot index, l denotes a symbol index,indicating physical cell ID, NCPRepresents a constant associated with a Cyclic Prefix (CP) type, N CP = 1 fornormalCP 0 forextendedCP .
then, according to the mode specified by LTE, use cinitThe sequence c (i) is further calculated by the method specified in section 36.211a107.2 of LTE, and then calculated by the formula (2)And (4) sequencing.
<math> <mrow> <msub> <mi>r</mi> <mrow> <mi>l</mi> <mo>,</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> </mrow> </msub> <mrow> <mo>(</mo> <mi>m</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mn>1</mn> <msqrt> <mn>2</mn> </msqrt> </mfrac> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>2</mn> <mo>&CenterDot;</mo> <mi>c</mi> <mrow> <mo>(</mo> <mn>2</mn> <mi>m</mi> <mo>)</mo> </mrow> <mo>)</mo> </mrow> <mo>+</mo> <mi>j</mi> <mfrac> <mn>1</mn> <msqrt> <mn>2</mn> </msqrt> </mfrac> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>2</mn> <mo>&CenterDot;</mo> <mi>c</mi> <mrow> <mo>(</mo> <mn>2</mn> <mi>m</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math> m = 0,1 , . . . , 2 N RB max , DL - 1 - - - ( 2 )
Wherein,and taking the value as the determined transmission bandwidth.
After determining the sequence r (m) of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth, the network side maps the transmission bandwidth in the subframe determined by the determined subframe pattern according to a mapping pattern specified by LTE.
When the downlink reference signal is transmitted, the method may further include:
the network side sends a subframe offset parameter used for indicating the initial subframe position of the sent downlink reference signal in a wireless frame; the subframe offset parameter is used for describing a starting subframe position of the downlink reference signal in a radio frame.
Here, when the determined subframe patterns are distributed according to a 5ms period, the subframe offset parameter value ranges are 0, 1, 2, 3, and 4;
and when the determined subframe patterns are distributed according to the 2ms period, the value range of the subframe offset parameter is 0 and 1.
When the determined subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, the subframe offset parameter value range is 0, 1, 2, 3.
In an actual application process, a specific value of the subframe offset parameter is a conventional technical means of a person skilled in the art, and is not described herein again.
The present invention also provides a method for receiving downlink reference signals, as shown in fig. 2, the method includes the following steps:
step 201: the receiving end determines a subframe pattern transmitted by a downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier;
here, the receiving end may be a UE or a small cell (small cell).
The concrete realization of this step includes:
when the system bandwidth of the carrier is greater than M PRB pairs, the receiving end determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is M PRB pairs; or,
when the system bandwidth of the carrier is greater than N PRB pairs and less than or equal to M PRB pairs, the receiving end determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs, the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs and in FDD mode, the receiving end determines subframe patterns as subframes #0, #4, #5, and #9 in a radio frame; when the system bandwidth of the carrier is equal to the N PRB pairs and in a TDD mode, the receiving end determines subframe patterns as subframes #0, #1, #5 and #6 in a wireless frame and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to the N PRB pairs, the receiving end determines that the subframe patterns are distributed according to the 2ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier.
Through a large number of simulation experiments, preferably, for the LTE system, the values of M and N are 25 and 6, respectively.
When the subframe pattern is determined to be subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, the receiving end and the network side agree in advance to preferentially select a subframe pattern in which all subframes in the subframe pattern are downlink subframes as the determined subframe pattern.
When the system bandwidth of the carrier is equal to N PRB pairs, the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame according to the following:
firstly, a determined subframe pattern adopts two continuous subframes which are equally spaced, and the two continuous subframes are beneficial to synchronous tracking, specifically, in the two continuous subframes, the time deviation and the frequency deviation which can be generated by signals are very limited, so that the average can be carried out when the downlink reference signals in the two continuous subframes are used for synchronous tracking, the synchronous tracking performance is improved, and the method is particularly suitable for synchronous tracking under high-speed movement of a receiving end;
secondly, in the LTE system, when the LTE system is in TDD mode, four subframes in the subframe pattern may be configured as paging subframes, and regardless of whether the LTE system is in TDD mode or FDD mode, subframes #0 and #5 are used to carry system information and PSS/SSS, and these subframes do not carry PMCH, so the subframe carrying the downlink reference signal does not collide with the subframe carrying PMCH.
When the system bandwidth of the carrier is equal to N PRB pairs, the receiving end determines that the subframe pattern is subframe #0, #1, #5, and #6 in a radio frame, or subframe #1, #2, #6, and #7 in a radio frame, or subframe #2, #3, #7, and #8 in a radio frame, or subframe #3, #4, #8, and #9 in a radio frame, and when the receiving end and the network side agree in advance that only one subframe pattern needs to be selected for use, the preferred subframe pattern is: subframes #0, #1, #5, and # 6.
When the system bandwidth of the carrier is equal to N PRB pairs and in FDD mode, the receiving end determines subframe patterns as subframes #0, #4, #5, and #9 in a radio frame; when the TDD mode is used, the basis for the receiving end to determine that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame is as follows:
the subframes in the determined subframe pattern are all potential paging subframes, and are not capable of bearing the PMCH, so that the subframe bearing the downlink reference signal is not collided with the subframe bearing the PMCH, normal transmission of the downlink reference signal in a mixed carrier wave of MBMS and unicast service in subframe time division multiplexing is ensured, and the subframe bearing the downlink reference signal is not collided with the MBSFN subframe.
The PRB pair refers to a PRB pair conforming to the definition of a PRB pair in LTE 36.211; further, the PRB pair includes a PRB pair composed of all downlink OFDM symbols in a special subframe of the TDD mode.
The determining that the transmission bandwidth is M PRB pairs specifically includes:
and determining M PRB pairs with continuous transmission bandwidth in the middle of the system bandwidth of the carrier.
The determining subframe patterns are distributed according to a 5ms period, and specifically include:
the subframe pattern is determined to be subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame.
Here, when the receiving end and the network side have predetermined that only one subframe pattern needs to be selected for use when determining that the subframe patterns are subframes #0 and #5 in a radio frame, or subframes #1 and #6 in a radio frame, or subframes #2 and #7 in a radio frame, or subframes #3 and #8 in a radio frame, or subframes #4 and #9 in a radio frame, the preferred subframe patterns are: subframes #0 and # 5.
The subframes #1, #2, #3, #4, #5, #6, #7, #8, and #9 are numbers of subframes in a radio frame, and specifically, the subframe #1 is a subframe number 1 in the radio frame, the subframe #2 is a subframe number 2 in the radio frame, and so on.
And for the LTE system, when the network side selects multiple subframe patterns for use, the method may further include:
and the receiving end determines the subframe pattern used for transmitting the downlink reference signal according to the received MIB information or indication information which is configured in other high-level signaling except the MIB information and used for indicating the subframe pattern transmitted by the downlink reference signal in the carrier wave of the receiving end. Here, the other higher layer signaling may be SIBx.
The downlink reference signal may be a synchronization tracking reference signal or a synchronization reference signal used for a receiving end to perform synchronization tracking with a carrier.
The downlink reference signal may also be a CRS of port 0 specified by the LTE R8 standard.
The downlink reference signal can also be a common DMRS; here, the present invention also performs a simulation experiment on the performance of the existing CSI-RS and DMRS for synchronization tracking, and obtains a certain gain, so that the downlink reference signal is the CSI-RS mapped and transmitted at the common port in the LTE system. The common port refers to a port that can be received by all receiving terminals in a cell, in other words, the CSI-RS mapped and sent at the common port in the LTE system is a CSI-RS specific to the cell, that is, a CSI-RS specific to a UE in the current LTE system. Correspondingly, the downlink reference signal is a DMRS sent according to common precoding mapping in the LTE system, that is, the downlink reference signal is a common DMRS. The common precoding refers to precoding that can be known by all receiving terminals in a cell, that is, a DMRS specific to a UE in an LTE system at present.
The downlink reference signals may also be used for RRM measurements.
The receiving end can use the prior art to know the system bandwidth of the carrier.
Step 202: and the receiving end receives the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
Here, the sequence of the received downlink reference signal is: generating a sequence of the downlink reference signal according to the maximum bandwidth supported by an LTE system, and intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal; or a sequence of the downlink reference signal generated according to the system bandwidth of the current carrier supported by the LTE system; or a sequence of the downlink reference signal generated according to the determined transmission bandwidth.
The method may further comprise:
the receiving end determines the initial subframe position of the received downlink reference signal in a wireless frame according to the received subframe offset parameter; the subframe offset parameter is used for describing a starting subframe position of the downlink reference signal in a radio frame.
Here, when the determined subframe patterns are distributed according to a 5ms period, the subframe offset parameter value ranges are 0, 1, 2, 3, and 4;
and when the determined subframe patterns are distributed according to the 2ms period, the value range of the subframe offset parameter is 0 and 1.
When the determined subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, the subframe offset parameter value range is 0, 1, 2, 3.
In an actual application process, a specific value of the subframe offset parameter is a conventional technical means of a person skilled in the art, and is not described herein again.
Further, when the method for transmitting the downlink reference signal provided by the present invention is used to perform neighbor cell measurement, the receiving end needs to acquire system bandwidth information of a carrier of a neighbor cell to determine a subframe pattern of the downlink reference signal of the neighbor cell. The invention provides the following two implementation modes:
in the first mode, the system bandwidth information of the carrier of the adjacent cell is added in the high-level signaling such as a switching command or a measurement command, and the receiving end can acquire the system bandwidth information of the carrier of the adjacent cell through the high-level signaling;
in the second mode, after the receiving end is synchronized with the neighboring cell, that is, after the PSS/SSS is received, the MIB information of the neighboring cell is further received, so as to obtain the system bandwidth information of the carrier of the neighboring cell. Wherein the MIB information includes system bandwidth information of a carrier of a neighboring cell.
The present invention will be described in further detail with reference to examples.
In the first to fifth embodiments, the receiving ends are all UEs, and the downlink reference signals are all synchronization tracking reference signals.
Example one
In this embodiment, the system bandwidth of the carrier is 10MHz, and for an LTE system, 50 PRB pairs are provided correspondingly; the values of M and N are 25 and 6 respectively. The network side and the UE have agreed in advance how to determine the subframe pattern for sending the synchronization tracking reference signal according to the system bandwidth of the carrier, and agree to use a single subframe pattern, with preferred subframe patterns being subframes #0 and # 5.
For the network side, the number of PRB pairs corresponding to the system bandwidth of the carrier is more than 25, so that the network side determines that subframe patterns sent by the synchronous tracking reference signal are distributed according to a 5ms period; since the subframe patterns adopted by the UE in advance are subframe patterns, preferably subframe patterns are subframe #0 and subframe #5, the network side determines the subframe patterns transmitted by the synchronization tracking reference signal to be subframe #0 and subframe # 5; the network side determines 25 continuous PRB pairs among 50 PRB pairs having a transmission bandwidth of the carrier system bandwidth. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in the middle continuous 25 PRB pairs of the subframes #0 and #5 in the wireless frame.
Before sending the synchronization tracking reference signal, the network side firstly generates a sequence of the synchronization tracking reference signal according to the maximum system bandwidth of 20MHz supported by the LTE system, then intercepts the sequence to obtain a sequence of the synchronization tracking reference signal corresponding to 25 continuous PRB pairs in the middle of 50 PRB pairs of the system bandwidth of the carrier, and then sends the obtained sequence of the synchronization tracking reference signal in 25 continuous PRB pairs in the middle of corresponding subframes #0 and #5 in a radio frame. The 20MHz corresponds to 100 PRB pairs, and correspondingly, the continuous 25 PRB pairs for transmitting the synchronization tracking reference signal are also 25 PRB pairs continuous in the middle of the 100 PRB pairs corresponding to the 20 MHz.
For the UE, it is known that the system bandwidth of the carrier is 50 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is greater than 25, so that the UE determines that the transmission cycle of the synchronization tracking reference signal is 5 ms; since the subframe patterns adopted by the network side in advance are subframe patterns, and the preferable subframe patterns are subframe #0 and subframe #5, the UE determines that the subframe patterns transmitted by the synchronization tracking reference signal are subframe #0 and subframe # 5; and, the UE determines that the transmission bandwidth is 25 consecutive PRB pairs among 50 PRB pairs of the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in the middle continuous 25 PRB pairs of subframes #0 and #5 in the radio frame.
When the synchronous tracking reference signal is transmitted and received, the network side and the UE appoint the synchronous tracking reference signal to be mapped and transmitted and received in the determined PRB pair according to the CRS port 0 of the LTE R8 in advance; in other words, the network side transmits the synchronization tracking reference signal in the determined PRB through port 0 of the CRS specified by LTE R8 in the subframe corresponding to the determined subframe pattern; correspondingly, the UE receives the synchronization tracking reference signal in the certain PRB pair through port 0 of the CRS specified by port 0LTE R8 in the subframe corresponding to the certain subframe pattern. Meanwhile, the UE considers that the received sequence of the synchronization tracking reference signal generates a sequence of the synchronization tracking reference signal according to a system bandwidth of maximum 20MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signal of 25 PRB pairs of the transmission bandwidth is a sequence of the synchronization tracking reference signal of 25 PRB pairs correspondingly truncated from the generated sequence of the synchronization tracking reference signal.
Example two
In this embodiment, the system bandwidth of the carrier is 1.4MHz, and for the LTE system, there are 6 PRB pairs correspondingly; m and N take the values 25 and 6, respectively. The network side and the UE have previously determined the subframe pattern of synchronization tracking reference signal transmission according to the system bandwidth of the carrier, and agree to use a unique subframe pattern, and the preferred subframe patterns are subframes #0, #1, #5, and # 6.
For the network side, the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6, so the network side determines the subframe patterns transmitted by the synchronization tracking reference signal to be subframes #0, #1, #5, and # 6; and, the network side determines that the transmission bandwidth is the system bandwidth of the carrier, i.e. 6 PRB pairs. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in all 6 PRB pairs of subframes #0, #1, #5, and #6 in the radio frame.
Before sending the synchronization tracking reference signal, the network side first generates a sequence of the synchronization tracking reference signal according to the maximum system bandwidth of 20MHz supported by the LTE system, then performs interception to obtain sequences of synchronization tracking reference signals corresponding to consecutive 6 PRB pairs, and then sends the obtained sequences of synchronization tracking reference signals in corresponding 6 PRB pairs of #0, #1, #5, and #6 in a radio frame. The 20MHz corresponds to 100 PRB pairs, and correspondingly, the 6 PRB pairs for transmitting the synchronization tracking reference signal are also 6 PRB pairs which are continuous in the middle of the 100 PRB pairs corresponding to the 20 MHz.
For the UE, it knows that the system bandwidth of the carrier is 6 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6, so the UE determines that the subframe patterns transmitted by the synchronization tracking reference signal are subframes #0, #1, #5, and # 6; and, the UE determines that the transmission bandwidth is 6 PRB pairs of the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all the consecutive 6 PRB pairs of subframes #0, #1, #5, and #6 in the radio frame.
When the synchronous tracking reference signal is transmitted and received, the network side and the UE appoint the synchronous tracking reference signal to be mapped and transmitted and received in the determined PRB pair according to the CRS port 0 of the LTE R8 in advance; in other words, the network side transmits the synchronization tracking reference signal in the determined PRB through port 0 of the CRS specified by LTE R8 in the subframe corresponding to the determined subframe pattern; correspondingly, the UE receives the synchronization tracking reference signal in the certain PRB pair through port 0 of the CRS specified by port 0LTE R8 in the subframe corresponding to the certain subframe pattern. Meanwhile, the UE considers that the received sequence of the synchronization tracking reference signal generates a sequence of the synchronization tracking reference signal according to a system bandwidth of maximum 20MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signal of 6 PRB pairs of a transmission bandwidth is a sequence of the synchronization tracking reference signal of 6 PRB pairs correspondingly truncated from the generated sequence of the synchronization tracking reference signal.
EXAMPLE III
In this embodiment, the system bandwidth of the carrier is 1.4MHz, and is in FDD mode, and for the LTE system, there are correspondingly 6 PRB pairs; m and N take the values 25 and 6, respectively.
For the network side, the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6, plus the FDD mode, so the network side determines the subframe patterns transmitted by the synchronization tracking reference signal as subframes #0, #4, #5 and # 9; and, the network side determines that the transmission bandwidth is the system bandwidth of the carrier, i.e. 6 PRB pairs. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in all 6 PRB pairs of subframes #0, #4, #5 and #9 in the radio frame.
Before sending the synchronization tracking reference signal, the network side first generates a sequence of the synchronization tracking reference signal according to the maximum system bandwidth of 20MHz supported by the LTE system, then performs interception to obtain sequences of synchronization tracking reference signals corresponding to consecutive 6 PRB pairs, and then sends the obtained sequences of synchronization tracking reference signals in corresponding 6 PRB pairs of #0, #1, #5, and #6 in a radio frame. The 20MHz corresponds to 100 PRB pairs, and correspondingly, the 6 PRB pairs for transmitting the synchronization tracking reference signal are also 6 PRB pairs which are continuous in the middle of the 100 PRB pairs corresponding to the 20 MHz.
For the UE, it is known that the system bandwidth of the carrier is 6 PRB pairs and in FDD mode, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6, so the UE determines subframe patterns transmitted by the synchronization tracking reference signal to be #0, #4, #5, and # 9; and, the UE determines that the transmission bandwidth is 6 PRB pairs of the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all the consecutive 6 PRB pairs of subframes #0, #4, #5, and #9 in the radio frame.
When the synchronous tracking reference signal is transmitted and received, the network side and the UE appoint the synchronous tracking reference signal to be mapped and transmitted and received in the determined PRB pair according to the CRS port 0 of the LTE R8 in advance; in other words, the network side transmits the synchronization tracking reference signal in the determined PRB through port 0 of the CRS specified by LTE R8 in the subframe corresponding to the determined subframe pattern; correspondingly, the UE receives the synchronization tracking reference signal in the certain PRB pair through port 0 of the CRS specified by port 0LTE R8 in the subframe corresponding to the certain subframe pattern. Meanwhile, the UE considers that the received sequence of the synchronization tracking reference signal generates a sequence of the synchronization tracking reference signal according to a system bandwidth of maximum 20MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signal of 6 PRB pairs of a transmission bandwidth is a sequence of the synchronization tracking reference signal of 6 PRB pairs correspondingly truncated from the generated sequence of the synchronization tracking reference signal.
Example four
In this embodiment, the system bandwidth of the carrier is 1.4MHz, and for the LTE system, there are 6 PRB pairs correspondingly; m and N take the values 25 and 6, respectively.
For the network side, the number of PRB pairs corresponding to the system bandwidth of a carrier is equal to 6, so the network side selects a reasonable subframe pattern sent by a synchronization tracking reference signal according to the scheduling requirements of unicast service and/or multicast service in the carrier, and assumes that it is determined as subframes #1, #2, #6, and # 7; and, the network side determines that the transmission bandwidth is the system bandwidth of the carrier, i.e. 6 PRB pairs. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in all 6 PRB pairs of subframes #1, #2, #6, and #7 in the radio frame. Meanwhile, the network side configures indication information for indicating subframe patterns transmitted by the synchronous tracking reference signals in the UE carrier as subframes #1, #2, #6 and #7 in the MIB information; here, in the actual application process, the configured indication information may adopt a mode of numbering agreed by the network side and the UE; for example, the subframe patterns transmitted by the synchronization tracking reference signal may be designated as subframes #0, #1, #5 and #6 and numbered 1, the subframe patterns transmitted by the synchronization tracking reference signal may be designated as subframes #1, #2, #6 and #7 and numbered 2, the subframe patterns transmitted by the synchronization tracking reference signal may be designated as subframes #2, #3, #7 and #8 and numbered 3, the subframe patterns transmitted by the synchronization tracking reference signal may be designated as subframes #3, #4, #8 and #9 and numbered 4, when the subframe patterns transmitted by the synchronization tracking reference signal are determined as subframes #1, #2, #6 and #7, the subframe patterns transmitted by the synchronization tracking reference signal may be designated as subframes #2 corresponding to subframes #1, #2, #6 and #7, and accordingly, after the UE receives the subframe patterns transmitted by the synchronization tracking reference signal, the subframe patterns transmitted by the synchronization tracking reference signal may be designated as subframes #1, #2, #6 and #7 #2, #6, and # 7.
Before sending the synchronization tracking reference signal, the network side first generates a sequence of the synchronization tracking reference signal according to the maximum system bandwidth of 20MHz supported by the LTE system, then performs interception to obtain sequences of synchronization tracking reference signals corresponding to consecutive 6 PRB pairs, and then sends the obtained sequences of synchronization tracking reference signals in corresponding 6 PRB pairs of #1, #2, #6, and #7 in a radio frame. The 20MHz corresponds to 100 PRB pairs, and correspondingly, the 6 PRB pairs for transmitting the synchronization tracking reference signal are also 6 PRB pairs which are continuous in the middle of the 100 PRB pairs corresponding to the 20 MHz.
For the UE, it knows that the system bandwidth of the carrier is 6 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6, so that the UE receives MIB information, and determines subframe patterns sent by a synchronization tracking reference signal from the MIB information as subframes #1, #2, #6, and # 7; and, the UE determines that the transmission bandwidth is 6 PRB pairs of the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all the consecutive 6 PRB pairs of subframes #1, #2, #6, and #7 in the radio frame.
When the synchronous tracking reference signal is transmitted and received, the network side and the UE appoint the synchronous tracking reference signal to be mapped and transmitted and received in the determined PRB pair according to the CRS port 0 of the LTE R8 in advance; in other words, the network side transmits the synchronization tracking reference signal in the determined PRB through port 0 of the CRS specified by LTE R8 in the subframe corresponding to the determined subframe pattern; correspondingly, the UE receives the synchronization tracking reference signal in the certain PRB pair through port 0 of the CRS specified by port 0LTE R8 in the subframe corresponding to the certain subframe pattern. Meanwhile, the UE considers that the received sequence of the synchronization tracking reference signal generates a sequence of the synchronization tracking reference signal according to a system bandwidth of maximum 20MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signal of 6 PRB pairs of a transmission bandwidth is a sequence of the synchronization tracking reference signal of 6 PRB pairs correspondingly truncated from the generated sequence of the synchronization tracking reference signal.
EXAMPLE five
In this embodiment, the system bandwidth of the carrier is 1.4MHz, and for the LTE system, there are 6 PRB pairs correspondingly; m and N take the values 25 and 6, respectively. The network side adopts the subframe offset parameter to indicate the starting subframe position of the synchronous tracking reference signal in the wireless frame. Setting the value ranges of the subframe offset parameters as 0, 1, 2 and 3, setting the starting subframes of the subframe patterns corresponding to the values as #0, #1, #2 and #3, setting the subframe patterns in the radio frame to determine the subframes for bearing the synchronous tracking reference signals in the radio frame according to the mode of 2 continuous subframes, then spacing 3 subframes and then 2 continuous subframes. According to the subframe pattern mode and the subframe offset parameter value set above, possible subframe patterns are subframes #0, #1, #5 and #6 in the radio frame, or subframes #1, #2, #6 and #7 in the radio frame, or subframes #2, #3, #7 and #8 in the radio frame, or subframes #3, #4, #8 and #9 in the radio frame.
For the network side, the number of PRB pairs corresponding to the system bandwidth of a carrier is equal to 6, so the network side selects a reasonable subframe pattern sent by a synchronization tracking reference signal according to the scheduling requirements of unicast service and/or multicast service in the carrier, and assumes that it is determined as subframes #1, #2, #6, and # 7; and the network side determines that the transmission bandwidth is the system bandwidth of the carrier, namely 6 PRB pairs, and further determines that the subframe offset parameter value 1 corresponding to the subframe pattern. After determining the subframe pattern, the transmission bandwidth and the subframe offset parameters, the network side finally transmits the synchronization tracking reference signals in all 6 PRB pairs of the subframes #1, #2, #6 and #7 in the radio frame. Meanwhile, a network side configures a subframe offset parameter in MIB information, and the initial subframe used for indicating the synchronous tracking reference signal transmission in the carrier wave for the UE is # 1; correspondingly, after receiving the subframe offset parameter, the UE can know that the subframe patterns transmitted by the synchronization tracking reference signal are subframes #1, #2, #6, and #7, and the starting subframe transmitted by the synchronization tracking reference signal is # 1.
Before transmitting the synchronization tracking reference signal, the network side generates a sequence of the synchronization tracking reference signal according to the determined transmission bandwidth to obtain a sequence of the synchronization tracking reference signal corresponding to the consecutive 6 PRB pairs, and then transmits the obtained sequence of the synchronization tracking reference signal in the 6 PRB pairs corresponding to the subframes #1, #2, #6, and #7 in the radio frame.
For the UE, it knows that the system bandwidth of the carrier is 6 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6, so that the UE receives MIB information, knows that the subframe offset parameter value is 1 from the MIB information, and thus determines that subframe patterns sent by the synchronization tracking reference signal are subframes #1, #2, #6, and # 7; and, the UE determines that the transmission bandwidth is 6 PRB pairs of the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all the consecutive 6 PRB pairs of subframes #1, #2, #6, and #7 in the radio frame according to the subframe offset parameter.
When the synchronous tracking reference signal is transmitted and received, the network side and the UE appoint the synchronous tracking reference signal to be mapped and transmitted and received in the determined PRB pair according to the CRS port 0 of the LTE R8 in advance; in other words, the network side transmits the synchronization tracking reference signal in the determined PRB through port 0 of the CRS specified by LTE R8 in the subframe corresponding to the determined subframe pattern; correspondingly, the UE receives the synchronization tracking reference signal in the certain PRB pair through port 0 of the CRS specified by port 0LTE R8 in the subframe corresponding to the certain subframe pattern. Meanwhile, the UE considers the received sequence of the synchronous tracking reference signal to generate the sequence of the synchronous tracking reference signal according to the determined transmission bandwidth.
In order to implement the method shown in fig. 1, the present invention further provides a device for sending downlink reference signals, as shown in fig. 4, where the device for sending downlink reference signals includes: a first determining module 41 and a sending module 42; wherein,
a first determining module 41, configured to determine, according to a system bandwidth of a carrier, a subframe pattern sent by a downlink reference signal and a sending bandwidth of the downlink reference signal, and send the determined subframe pattern and the determined sending bandwidth to the sending module 42;
a sending module 42, configured to send the downlink reference signal in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the first determining module 41.
The sending device is located on a network side, and is preferably a base station.
The sending module 42 is further configured to generate a sequence of the downlink reference signal according to a maximum system bandwidth supported by an LTE system before sending the downlink reference signal; intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal, and taking the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth as the sequence of the downlink reference signal; or generating a sequence of the downlink reference signal according to a system bandwidth of a current carrier supported by an LTE system, as the sequence of the downlink reference signal transmitted in a PRB pair corresponding to the determined transmission bandwidth; or generating the sequence of the downlink reference signal according to the determined transmission bandwidth, as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth.
The sending module 42 is further configured to send a subframe offset parameter for indicating a starting subframe position of the sent downlink reference signal in a radio frame.
Here, the specific processing procedure of the first determining module in the sending device according to the present invention has been described in detail above, and is not described again.
In order to implement the method shown in fig. 2, the present invention further provides a receiving device for a downlink reference signal, as shown in fig. 5, where the receiving device includes: a second determining module 51 and a receiving module 52; wherein,
a second determining module 51, configured to determine, according to the system bandwidth of the carrier, a subframe pattern sent by the downlink reference signal and a sending bandwidth of the downlink reference signal, and send the determined subframe pattern and the determined sending bandwidth to the receiving module 52;
a receiving module 52, configured to receive the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined transmission bandwidth sent by the second determining module 51.
The receiving device may be a UE or a small cell.
The receiving module 52 is further configured to determine a starting subframe position of the received downlink reference signal in a radio frame according to the received subframe offset parameter.
Here, the specific processing procedure of the second determining module in the receiving device according to the present invention has been described in detail above, and is not described again.
Based on the sending device shown in fig. 3 and the receiving device shown in fig. 4, the present invention further provides a transmission system for transmitting downlink reference signals, where the transmission system includes: a transmitting device and a receiving device; the transmitting apparatus further includes: the device comprises a first determining module and a sending module; the receiving apparatus further includes: a second determining module and a receiving module; wherein,
the first determining module is used for determining a subframe pattern sent by a downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the sending module;
a sending module, configured to send the downlink reference signal to the receiving device in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the first determining module;
the second determining module is used for determining a subframe pattern sent by the downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the receiving module;
and the receiving module is configured to receive the downlink reference signal sent by the sending device in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the second determining module.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (33)

1. A method for transmitting a downlink reference signal, the method comprising:
the network side determines a subframe pattern transmitted by a downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier;
and the network side transmits the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
2. The method of claim 1, wherein the network side determines the subframe pattern of downlink reference signal transmission and the transmission bandwidth of downlink reference signal according to the system bandwidth of the carrier, and comprises:
when the system bandwidth of the carrier is greater than M Physical Resource Block (PRB) pairs, the network side determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is M PRB pairs; or,
when the system bandwidth of the carrier is greater than N PRB pairs and less than or equal to M PRB pairs, the network side determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs, the network side determines that the subframe pattern is subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs and in a Frequency Division Duplex (FDD) mode, the network side determines subframe patterns as subframes #0, #4, #5 and #9 in a radio frame; when the system bandwidth of the carrier is equal to N PRB pairs and in a Time Division Duplex (TDD) mode, the network side determines subframe patterns as subframes #0, #1, #5 and #6 in a wireless frame and determines a PRB pair corresponding to the system bandwidth of the carrier as a transmission bandwidth; or,
and when the system bandwidth of the carrier is equal to the N PRB pairs, the network side determines that the subframe patterns are distributed according to the 2ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier.
3. The method of claim 2, wherein M has a value of 25 and N has a value of 6.
4. The method of claim 2, wherein when determining the subframe pattern as subframes #0, #1, #5, and #6 in a radio frame, or as subframes #1, #2, #6, and #7 in a radio frame, or as subframes #2, #3, #7, and #8 in a radio frame, or as subframes #3, #4, #8, and #9 in a radio frame, the network side preferentially selects the subframe pattern in which all subframes in the subframe pattern are downlink subframes as the determined subframe pattern.
5. The method of claim 4, wherein the downlink subframe comprises a special subframe in TDD mode.
6. The method of claim 2, wherein when the network side determines that the subframe patterns are subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and when the network side needs to select only one subframe pattern for use, the preferred subframe pattern of the network side is: subframes #0, #1, #5, and #6 in the radio frame.
7. The method of claim 2, wherein the determining the transmission bandwidth is M PRB pairs, and wherein the determining the transmission bandwidth is:
and determining M PRB pairs with continuous transmission bandwidth in the middle of the system bandwidth of the carrier.
8. The method of claim 2, wherein the determined subframe patterns are distributed according to a 5ms periodicity as:
the subframe pattern is determined to be subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame.
9. The method of claim 8, wherein when determining subframe patterns as subframes #0 and #5 in a radio frame, or subframes #1 and #6 in a radio frame, or subframes #2 and #7 in a radio frame, or subframes #3 and #8 in a radio frame, or subframes #4 and #9 in a radio frame, and when the network side needs to select only one subframe pattern for use, the network side prefers subframe patterns as follows: subframes #0 and # 5.
10. The method of claim 2, wherein when the network side selects a plurality of subframe patterns for use, the method further comprises:
and the network side configures and sends indication information used for indicating a subframe pattern sent by the downlink reference signal in a receiving end carrier in system information block (MIB) information or other high-level signaling except the MIB information.
11. The method according to any one of claims 1 to 10, wherein the downlink reference signal is a synchronization tracking reference signal or a synchronization reference signal for synchronization tracking of a receiving end and a carrier, or a cell-specific reference signal (CRS) of port 0 specified by LTE R8 standard, or a channel state indication reference signal (CSI-RS) or a common demodulation reference signal (DMRS) mapped and transmitted on a common port in an LTE system, or the downlink reference signal is used for Radio Resource Management (RRM) measurement.
12. The method according to any of claims 1 to 10, wherein before transmitting the downlink reference signal, the method further comprises:
the network side generates a sequence of the downlink reference signal according to the maximum system bandwidth supported by the LTE system;
intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal, and taking the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth as the sequence of the downlink reference signal; or,
the network side generates a sequence of the downlink reference signal according to the system bandwidth of the current carrier supported by the LTE system, and the sequence is used as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth; or,
and the network side generates a sequence of the downlink reference signal according to the determined transmission bandwidth, and the sequence is used as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth.
13. The method according to any one of claims 1 to 10, wherein when transmitting the downlink reference signal, the method further comprises:
and the network side sends a subframe offset parameter used for indicating the position of the initial subframe of the sent downlink reference signal in a wireless frame.
14. The method of claim 13,
when the determined subframe patterns are distributed according to a 5ms period, the value range of the subframe offset parameter is 0, 1, 2, 3 and 4;
when the determined subframe patterns are distributed according to the 2ms period, the value range of the subframe offset parameter is 0 and 1;
when the determined subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, the subframe offset parameter value range is 0, 1, 2, 3.
15. A method for receiving a downlink reference signal, the method comprising:
the receiving end determines a subframe pattern transmitted by a downlink reference signal and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier;
and the receiving end receives the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
16. The method of claim 15, wherein the determining, by the receiving end, the subframe pattern of downlink reference signal transmission and the transmission bandwidth of the downlink reference signal according to the system bandwidth of the carrier comprises:
when the system bandwidth of the carrier is greater than M PRB pairs, the receiving end determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is M PRB pairs; or,
when the system bandwidth of the carrier is greater than N PRB pairs and less than or equal to M PRB pairs, the receiving end determines that subframe patterns are distributed according to a 5ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs, the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to N PRB pairs and in FDD mode, the receiving end determines subframe patterns as subframes #0, #4, #5, and #9 in a radio frame; when the system bandwidth of the carrier is equal to the N PRB pairs and in a TDD mode, the receiving end determines subframe patterns as subframes #0, #1, #5 and #6 in a wireless frame and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier; or,
when the system bandwidth of the carrier is equal to the N PRB pairs, the receiving end determines that the subframe patterns are distributed according to the 2ms period, and determines that the transmission bandwidth is the PRB pair corresponding to the system bandwidth of the carrier.
17. The method of claim 16, wherein M has a value of 25 and N has a value of 6.
18. The method of claim 16, wherein when the subframe pattern is determined to be subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, the receiving end and the network side pre-agree to preferentially select the subframe pattern in which all subframes in the subframe pattern are downlink subframes as the determined subframe pattern.
19. The method of claim 18, wherein the downlink subframe comprises a special subframe in TDD mode.
20. The method of claim 16, wherein when the receiving end determines subframe patterns as subframes #0, #1, #5, and #6 in a radio frame, or subframes #1, #2, #6, and #7 in a radio frame, or subframes #2, #3, #7, and #8 in a radio frame, or subframes #3, #4, #8, and #9 in a radio frame, and when the receiving end and the network side have a predetermined requirement for selecting only one subframe pattern, the receiving end prefers subframe patterns as follows: subframes #0, #1, #5, and # 6.
21. The method of claim 16, wherein the determining the transmission bandwidth is M PRB pairs:
and determining M PRB pairs with continuous transmission bandwidth in the middle of the system bandwidth of the carrier.
22. The method of claim 16, wherein the determined subframe patterns are distributed according to a 5ms periodicity as:
the subframe pattern is determined to be subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame.
23. The method of claim 22, wherein subframe patterns are determined as subframes #0 and #5 in a radio frame, or as subframes #1 and #6 in a radio frame, or as subframes #2 and #7 in a radio frame, or as subframes #3 and #8 in a radio frame, or as subframes #4 and #9 in a radio frame, and when the receiver and the network side have a predetermined requirement for selecting only one subframe pattern, the preferred subframe pattern of the receiver is: subframes #0 and # 5.
24. The method of claim 16, wherein when the network side selects a plurality of subframe patterns for use, the method further comprises:
and the receiving end determines the subframe pattern used for transmitting the downlink reference signal according to the received MIB information or indication information which is configured in other high-level signaling except the MIB information and used for indicating the subframe pattern transmitted by the downlink reference signal in the carrier wave of the receiving end.
25. The method according to any one of claims 15 to 24, wherein the downlink reference signal is a synchronization tracking reference signal or a synchronization reference signal for synchronization tracking of a receiving end and a carrier, or a CRS of port 0 specified by LTE R8 standard, or a CSI-RS or a common DMRS mapped and transmitted on a common port in an LTE system, or the downlink reference signal is used for RRM measurement.
26. The method according to any of claims 15 to 24, wherein the received sequence of the downlink reference signal is: generating a sequence of the downlink reference signal according to the maximum bandwidth supported by an LTE system, and intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal; or a sequence of the downlink reference signal generated according to the system bandwidth of the current carrier supported by the LTE system; or a sequence of the downlink reference signal generated according to the determined transmission bandwidth.
27. The method of any one of claims 15 to 24, further comprising:
and the receiving end determines the initial subframe position of the received downlink reference signal in a wireless frame according to the received subframe offset parameter.
28. The method of claim 27,
when the determined subframe patterns are distributed according to a 5ms period, the value range of the subframe offset parameter is 0, 1, 2, 3 and 4;
when the determined subframe patterns are distributed according to the 2ms period, the value range of the subframe offset parameter is 0 and 1;
when the determined subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, the subframe offset parameter value range is 0, 1, 2, 3.
29. A device for transmitting a downlink reference signal, the device comprising: the device comprises a first determining module and a sending module; wherein,
a first determining module, configured to determine, according to a system bandwidth of a carrier, a subframe pattern sent by a downlink reference signal and a sending bandwidth of the downlink reference signal, and send the determined subframe pattern and the determined sending bandwidth to the sending module 32;
and the sending module is used for sending the downlink reference signal in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the first determining module.
30. The transmitting device of claim 29,
the sending module is further configured to generate a sequence of the downlink reference signal according to a maximum system bandwidth supported by an LTE system before sending the downlink reference signal; intercepting the sequence of the downlink reference signal corresponding to the PRB pair corresponding to the determined transmission bandwidth from the generated sequence of the downlink reference signal, and taking the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth as the sequence of the downlink reference signal; or generating a sequence of the downlink reference signal according to a system bandwidth of a current carrier supported by an LTE system, as the sequence of the downlink reference signal transmitted in a PRB pair corresponding to the determined transmission bandwidth; or generating a sequence of the downlink reference signal according to the determined transmission bandwidth, as the sequence of the downlink reference signal transmitted in the PRB pair corresponding to the determined transmission bandwidth; and/or the subframe offset parameter is used for indicating the starting subframe position of the transmitted downlink reference signal in a radio frame.
31. A receiving device of downlink reference signals, the receiving device comprising: a second determining module and a receiving module; wherein,
the second determining module is used for determining a subframe pattern sent by the downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the receiving module;
and the receiving module is used for receiving the downlink reference signal in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the second determining module.
32. The receiving device of claim 31, wherein the receiving module is further configured to determine a starting subframe position of the received downlink reference signal in a radio frame according to the received subframe offset parameter.
33. A transmission system for transmitting a downlink reference signal, the system comprising: a transmitting device and a receiving device; the transmitting apparatus further includes: the device comprises a first determining module and a sending module; the receiving apparatus further includes: a second determining module and a receiving module; wherein,
the first determining module is used for determining a subframe pattern sent by a downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the sending module;
a sending module, configured to send the downlink reference signal to the receiving device in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the first determining module;
the second determining module is used for determining a subframe pattern sent by the downlink reference signal and a sending bandwidth of the downlink reference signal according to the system bandwidth of the carrier, and sending the determined subframe pattern and the determined sending bandwidth to the receiving module;
and the receiving module is configured to receive the downlink reference signal sent by the sending device in the determined sending bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined sending bandwidth sent by the second determining module.
CN201310172578.0A 2013-05-10 2013-05-10 Transmission method, device and system for downlink reference signal Pending CN104144504A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201310172578.0A CN104144504A (en) 2013-05-10 2013-05-10 Transmission method, device and system for downlink reference signal
PCT/CN2014/076366 WO2014180265A1 (en) 2013-05-10 2014-04-28 Method, device, system, and computer storage medium for transmitting downlink reference signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310172578.0A CN104144504A (en) 2013-05-10 2013-05-10 Transmission method, device and system for downlink reference signal

Publications (1)

Publication Number Publication Date
CN104144504A true CN104144504A (en) 2014-11-12

Family

ID=51853550

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310172578.0A Pending CN104144504A (en) 2013-05-10 2013-05-10 Transmission method, device and system for downlink reference signal

Country Status (2)

Country Link
CN (1) CN104144504A (en)
WO (1) WO2014180265A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017101607A1 (en) * 2015-12-16 2017-06-22 中兴通讯股份有限公司 Method and device for transmitting data
WO2019029536A1 (en) * 2017-08-11 2019-02-14 华为技术有限公司 Method for sending and receiving reference signal, network device, terminal device and system
CN109565425A (en) * 2017-04-27 2019-04-02 Oppo广东移动通信有限公司 Transmission method, terminal and the network equipment of reference signal
WO2019128879A1 (en) * 2017-12-29 2019-07-04 华为技术有限公司 Trs segment transmission method and device
WO2020020322A1 (en) * 2018-07-27 2020-01-30 华为技术有限公司 Communication method and apparatus
WO2020098439A1 (en) * 2018-11-12 2020-05-22 维沃移动通信有限公司 Measurement method, indication method, apparatus, terminal, network device, and medium
CN115085892A (en) * 2017-10-18 2022-09-20 高通股份有限公司 Aperiodic tracking reference signal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016119131A1 (en) * 2015-01-27 2016-08-04 华为技术有限公司 Method and apparatus for transmitting public information
CN111654356B (en) * 2019-03-04 2022-11-11 中国信息通信研究院 Downlink control information transmission method and device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101771444A (en) * 2009-01-06 2010-07-07 大唐移动通信设备有限公司 Method for setting reference signals in multi-antenna system and base station
CN103095631A (en) * 2011-11-03 2013-05-08 中兴通讯股份有限公司 Transmission method, allocation method and device of downlink reference signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101771444A (en) * 2009-01-06 2010-07-07 大唐移动通信设备有限公司 Method for setting reference signals in multi-antenna system and base station
CN103095631A (en) * 2011-11-03 2013-05-08 中兴通讯股份有限公司 Transmission method, allocation method and device of downlink reference signal

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017101607A1 (en) * 2015-12-16 2017-06-22 中兴通讯股份有限公司 Method and device for transmitting data
CN109565425A (en) * 2017-04-27 2019-04-02 Oppo广东移动通信有限公司 Transmission method, terminal and the network equipment of reference signal
CN109565425B (en) * 2017-04-27 2020-12-01 Oppo广东移动通信有限公司 Transmission method of reference signal, terminal and network equipment
US11171763B2 (en) 2017-04-27 2021-11-09 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for transmitting reference signal, terminal and network device
WO2019029536A1 (en) * 2017-08-11 2019-02-14 华为技术有限公司 Method for sending and receiving reference signal, network device, terminal device and system
US11818077B2 (en) 2017-08-11 2023-11-14 Huawei Technologies Co., Ltd. Reference signal sending and receiving method, network device, terminal device, and system
CN115085892A (en) * 2017-10-18 2022-09-20 高通股份有限公司 Aperiodic tracking reference signal
US11997043B2 (en) 2017-10-18 2024-05-28 Qualcomm Incorporated Aperiodic tracking reference signal
WO2019128879A1 (en) * 2017-12-29 2019-07-04 华为技术有限公司 Trs segment transmission method and device
US11464047B2 (en) 2017-12-29 2022-10-04 Huawei Technologies Co., Ltd. TRS burst transmission method and apparatus
CN110768769B (en) * 2018-07-27 2022-03-29 华为技术有限公司 Time synchronization method and device based on downlink reference signal
CN110768769A (en) * 2018-07-27 2020-02-07 华为技术有限公司 Time synchronization method and device based on downlink reference signal
WO2020020322A1 (en) * 2018-07-27 2020-01-30 华为技术有限公司 Communication method and apparatus
WO2020098439A1 (en) * 2018-11-12 2020-05-22 维沃移动通信有限公司 Measurement method, indication method, apparatus, terminal, network device, and medium
US12003996B2 (en) 2018-11-12 2024-06-04 Vivo Mobile Communication Co., Ltd. Measurement method, indication method, apparatus, terminal, network device, and medium

Also Published As

Publication number Publication date
WO2014180265A1 (en) 2014-11-13

Similar Documents

Publication Publication Date Title
CN113287346B (en) Method and apparatus for transmitting synchronization signal in wireless communication system
JP6674589B1 (en) Narrowband Time Division Duplex Frame Structure for Narrowband Communication
CN110301112B (en) Method and apparatus for wireless communication
CN109565406B (en) Method and apparatus for vehicle-to-vehicle communication
CN110945821B (en) Techniques for extended cell discovery
CN104144504A (en) Transmission method, device and system for downlink reference signal
CN104160766B (en) It is used for transmission method, base station and the user equipment of reference signal
KR101710204B1 (en) Method and apparatus of transmitting reference signal for channel measurement in multiple input multiple output communication system
CN109417529B (en) Method and apparatus for configuring and detecting cyclic prefix length in a cell supporting multiple subcarrier spacings
CN108683474B (en) Method and apparatus for transmitting common signal
WO2019096312A1 (en) Communication method and apparatuses
CN111837353B (en) Method and apparatus for transmitting and receiving positioning reference signal in wireless communication system
CN101714897A (en) Method for configuring sounding reference signals
KR102027352B1 (en) Mbsfn configuration method and device
KR20150028772A (en) Method for controlling handover in wireless communication system, and device therefor
CN105656597A (en) Data transmission method and device
CN111034331A (en) NPRACH with improved reliability performance
CN103220249A (en) Information transmission and configuration method and device
CN107734561A (en) Method and apparatus for allocation radio resource in a wireless communication system
CN118451754A (en) Improving reliability of side-link transmission reception
CN118451760A (en) Technology for promoting LTE CV2X autonomous synchronization

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20141112