WO2012088902A1

WO2012088902A1 - Method and system for sending sounding reference signal used for coordinated multipoint transmission system

Info

Publication number: WO2012088902A1
Application number: PCT/CN2011/078741
Authority: WO
Inventors: 王瑜新; 郝鹏; 陈艺戬
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-12-31
Filing date: 2011-08-23
Publication date: 2012-07-05
Also published as: CN102065557B; CN102065557A

Abstract

The present invention provides a method and a system for sending a sounding reference signal used for a coordinated multipoint transmission system. The method comprises: a base station setting configuration information for sending an SRS and delivering the configuration information to a user terminal, and the user terminal sending, according to the obtained configuration information, the SRS to the base station. Through the method of the present invention, the quality of SRS channel estimation by each base station in a coordinated set is improved, so that the base station may obtain downlink channel information by use of channel reciprocity, thereby greatly reducing the feedback quantity of a UE.

Description

用于协作多点传输***的测量参考信号发送方法及*** 技术领域 Measurement reference signal transmission method and system for cooperative multi-point transmission system

本发明涉及，尤指一种用于协作多点（CoMP, Coordinated Multi-point ) 传输***的测量参考信号（ SRS , Sounding Reference Signal )发送方法及系统。背景技术 The present invention relates to a method and system for transmitting a Sounding Reference Signal (SRS) for a CoMP (Coordinated Multi-point) transmission system. Background technique

长期演进（ LTE, Long Term Evolution ) ***的上行物理信道包含物理随机接入信道 ( PRACH, Physical Random Access Channel ) 、物理上行共享信道（PUSCH, Physical uplink shared channel ) 、物理上行控制信道 ( PUCCH, Physical uplink control channel ) 。其中， PUSCH有两种不同的循环前缀（CP, Cyclic Prefix )长度，分别是普通循环前缀（Normal CP, Normal Cyclic Prefix ) 和扩展循环前缀（Extended CP , Extended Cyclic Prefix ) 。 PUSCH的每个发送子帧（ Subframe ) 由两个时隙（Slot )组成，对于不同的循环前缀长度，解调参考信号（DMRS, Demodulation Reference Signal )在子帧中所处的位置会不一样。图 1是现有技术中解调参考信号的时域位置示意图，如图 1所示，每个子帧含有两个 DMRS符号，其中，图 la是釆用普通循环前缀时， DMRS 时域位置的示意图，每个子帧含有 14 个正交频分复用 ( OFDM, Orthogonal Frequency Division Multiplexing )符号，包括 DMRS符号， OFDM符号代表一个子帧的时域位置，图 lb为釆用扩展循环前缀时， DMRS时域位置的示意图，每个子帧含有 12个时域的数据 OFDM符号。 The uplink physical channel of the LTE (Long Term Evolution) system includes a physical random access channel (PRACH), a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH, Physical). Uplink control channel ). Among them, PUSCH has two different cyclic prefixes (CP, Cyclic Prefix) lengths, which are Normal Cyclic Prefix and Extended Cyclic Prefix. Each sub-frame of a PUSCH consists of two slots (Slots). For different cyclic prefix lengths, the Demodulation Reference Signal (DMRS) position is different in the subframe. 1 is a schematic diagram of a time domain position of a demodulation reference signal in the prior art. As shown in FIG. 1, each subframe contains two DMRS symbols, where FIG. 1a is a schematic diagram of a DMRS time domain position when a normal cyclic prefix is used. Each subframe contains 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols, including DMRS symbols, the OFDM symbol represents the time domain position of one subframe, and FIG. 1b is the DMRS time when the extended cyclic prefix is used. Schematic diagram of the location of the domain, each subframe containing 12 time domain data OFDM symbols.

多点协作传输技术，是利用多个小区的发射天线协作传输来实现小区边缘处无线链路的较高容量和可靠传输，可以有效解决小区边缘干扰问题。多点传输的基本原理和多小区联合处理的结构图如图 2所示。下行 CoMP 分为两类：联合处理 /联合传输（JP/JT, Joint Processing/Joint Transmission) 和协作调度 /波束赋形（CS/CB , Coordinated Scheduling/Beamforming )。在 JT中，数据从多个小区同时发送，而且发送数据、调度和信道状态信息仅在协作集中的多个发射点之间进行交互；而在 CS/CB中，只有服务小区向 UE发送数据，调度和波束 ( Beamforming )信息在 CoMP协作集中交互。参与传输或协作的不同的小区就组成一个协作集，协作集中有 1 个小区为服务小区，剩余的小区为协作小区。 The multi-point coordinated transmission technology utilizes the coordinated transmission of the transmit antennas of multiple cells to achieve higher capacity and reliable transmission of the wireless link at the cell edge, and can effectively solve the problem of cell edge interference. The basic principle of multipoint transmission and the structure diagram of multi-cell joint processing are shown in Fig. 2. Downlink CoMP is divided into two categories: Joint Processing/Joint Transmission (JP/JT, Joint Processing/Joint Transmission) and Coordinated Scheduling/Beamforming (CS/CB, Coordinated Scheduling/Beamforming). In JT, data is simultaneously transmitted from multiple cells, and the transmission data, scheduling, and channel state information are only exchanged between multiple transmission points in the cooperation set; in CS/CB, only the serving cell sends data to the UE, The scheduling and beamforming information interacts in the CoMP collaboration set. Different cells participating in transmission or cooperation form a cooperation set. In the cooperation set, one cell is a serving cell, and the remaining cells are coordinated cells.

SRS是一种 UE与基站间用来测量无线信道信息（CSI, Channel State Information ) 的信号。在 LTE***中， UE按照 eNB指示的带宽、频域位置、序列循环移位、周期和子帧偏置等参数，定时在发送子帧的最后一个数据符号上发送上行 SRS; eNB根据接收到的 SRS判断 UE上行的 CSI, 并根据得到的 CSI进行频域选择调度、闭环功率控制等操作。 SRS is a signal used between a UE and a base station to measure channel state information (CSI). In the LTE system, the UE sends an uplink SRS on the last data symbol of the transmitting subframe according to the bandwidth indicated by the eNB, the frequency domain location, the sequence cyclic shift, the period, and the subframe offset, and the eNB receives the uplink SRS according to the received SRS. The uplink CSI of the UE is determined, and operations such as frequency domain selection scheduling and closed loop power control are performed according to the obtained CSI.

在 LTE***中， UE发送的 SRS序列是通过对一条根序列 ^{7 (n)}在时域进行循环移位 "得到的。对同一条根序列进行不同的循环移位"，就能够得到不同的 SRS序列，并且得到的这些 SRS序列之间相互正交，因此，可以将这些 SRS序列分配给不同的 UE使用，以实现 UE间的码分多址。在 LTE ***中， SRS序列定义了 8个循环移位 α , 通过公式（1 )给出： = 2π-^-In the LTE system, the SRS sequence sent by the UE is obtained by cyclically shifting a root sequence ^{7 (n)} in the time domain. Different cyclic shifts are performed on the same root sequence, and different SRSs can be obtained. The sequence, and the obtained SRS sequences are mutually orthogonal, and therefore, these SRS sequences can be allocated to different UEs for use in implementing code division multiple access between UEs. In the LTE system, the SRS sequence defines eight cyclic shifts α, given by equation (1): = 2π-^-

8 (1) 公式 (1)中， s由 3bit的信令来指示，分别为 0、 1、 2、 3、 4、 5、 6和8 (1) In equation (1), s is indicated by 3-bit signaling, which are 0, 1, 2, 3, 4, 5, 6 and

7。也就是说，在同一时频资源下，小区内的 UE有 8个可用的码资源， eNB 最多可以配置 8个 UE在相同的时频资源上同时发送 SRS。公式 (1)可以看作将 SRS序列在时域等间隔分为 8份，但由于 SRS序列长度为 12的倍数，所以 SRS序列的最小长度为 24。在 LTE***中， SRS的频域带宽釆用树型结构进行配置。每一种 SRS 带宽配置（ SRS bandwidth configuration )对应一个树形结构，最高层（或称为第一层）的 SRS带宽（ SRS-Bandwidth )对应该 SRS带宽配置的最大 SRS 带宽，或称为 SRS带宽范围。 UE根据基站的信令指示，计算得到自身的 SRS带宽后，再根据 eNB发送的上层信令频域位置 "^c来确定自身发送 SRS 的频域初始位置。图 3为现有技术中分配不同^ c的 UE发送 SRS的频域初始位置的示意图，如图 3所示，分配了不同^ c的 _UE将在小区 SRS带宽的不同区域发送 SRS,其中， UE1根据^ c ₌₀确定发送 SRS的频率初始位置， UE2根据 ^ =3确定发送 SRS的频率初始位置， UE3根据 ^ ₌₄确定发送 SRS的频率初始位置， UE4根据^ c =6确定发送 SRS的频率初始位置。 7. That is to say, under the same time-frequency resource, the UE in the cell has 8 available code resources, and the eNB can configure up to 8 UEs to simultaneously send the SRS on the same time-frequency resource. Equation (1) can be regarded as dividing the SRS sequence into 8 parts at equal intervals in the time domain, but since the SRS sequence length is a multiple of 12, the minimum length of the SRS sequence is 24. In the LTE system, the frequency domain bandwidth of the SRS is configured in a tree structure. Each SRS bandwidth configuration corresponds to a tree structure. The SRS bandwidth of the highest layer (or the first layer) (SRS-Bandwidth) corresponds to the maximum SRS bandwidth of the SRS bandwidth configuration, or SRS bandwidth. range. The UE calculates its own SRS bandwidth according to the signaling indication of the base station, and then determines the initial frequency domain position of the SRS according to the upper layer signaling frequency domain position “^c transmitted by the eNB. FIG. 3 is different in the prior art. A schematic diagram of the frequency domain initial position of the UE transmitting the SRS, as shown in FIG. 3, the _UEs allocated with different _CCs will send SRS in different areas of the SRS bandwidth of the cell, where the UE1 determines to send the SRS according to ^c ₌₀ . The frequency initial position, UE2 determines the frequency initial position of transmitting the SRS according to ^=3, UE3 determines the frequency initial position of transmitting the SRS according to ^ ₌₄ , and UE4 determines the frequency initial position of transmitting the SRS according to ^c=6.

在 LTE 中，从时域上看， UE 只在子帧的最后一个单载波频分复用 ( SC-FDMA, Single Carrier Frequency Division Multiple Access )符号上发送 SRS。UE在时域发送 SRS的配置与四个参数有关：小区专有（ cell-specific ) 子帧周期（ ^TSFC )和专有子帧偏置（ ^Δ ) , 及 UE专有（ UE-specific ) 的周期（ )和子帧偏置（ ^τ )。表 1和表 2分别给出了频分双工（ FDD , Frequency Division Duplex ) 和时分双工（TDD , Time Division Duplex ) ***中 cell-specific的周期和子帧偏置。 cell-specific的周期和子帧偏置给出了小区内所有 UE可能发送 SRS 的时域子帧位置，而在其他子帧上，最后一个 SC-FDMA 符号的使用与 SRS 的发送无关。以表 1 中 srsSubframeConfiguration=7为例 , ^TsFC =⁵ , ^{SFC =} ^⁰'^ ,则小区内 cell-specific 的一个 SRS发送周期为 5个子帧，每个周期内的子帧 0和子帧 1位置将可以被 UE用来发送 SRS。 SRS 子帧配置周期（子帧数）子帧偏置二进制 In LTE, from the time domain, the UE transmits the SRS only on the last single carrier frequency division multiplexing (SC-FDMA) symbol of the subframe. When transmitting UE-domain SRS configuration parameters related to four: a cell-specific (cell-specific) sub-frame period ^(T SFC) and proprietary sub-frame offset ^(Δ), and the UE-specific (UE-specific) of Period ( ) and subframe offset ( ^τ ). Table 1 and Table 2 show the cell-specific period and subframe offset in the Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems, respectively. The cell-specific period and subframe offset give the time domain subframe position where all UEs in the cell may transmit SRS, while in other subframes, the use of the last SC-FDMA symbol is independent of the SRS transmission. Taking srsSubframeConfiguration=7 in Table 1 as an example, ^TsFC = ⁵ and ^{SFC =} ^ ⁰ '^ , the cell-specific one SRS transmission period in the cell is 5 subframes, and the subframe 0 and subframe 1 positions in each cycle will be Can be used by the UE to send SRS. SRS subframe configuration period (subframe number) Subframe offset binary

(SRS Subframe (Configuration Period (Transmission offset (SRS Subframe (Configuration Period (Transmission offset)

( Binary ) ( Binary )

Configuration) T^SFC (subframes)) △^SFC (subframes)) Configuration) T ^SFC (subframes)) △ ^SFC (subframes))

0 0000 1 {0} 0 0000 1 {0}

1 0001 2 {0} 1 0001 2 {0}

2 0010 2 {1} 2 0010 2 {1}

3 0011 5 {0} 3 0011 5 {0}

4 0100 5 {1} 4 0100 5 {1}

5 0101 5 {2} 5 0101 5 {2}

6 0110 5 {3} 6 0110 5 {3}

7 0111 5 {0,1} 7 0111 5 {0,1}

8 1000 5 {2,3} 8 1000 5 {2,3}

9 1001 10 {0} 9 1001 10 {0}

10 1010 10 {1} 10 1010 10 {1}

11 1011 10 {2} 11 1011 10 {2}

12 1100 10 {3} 12 1100 10 {3}

13 1101 10 {0,1,2,3,4,6,8} 13 1101 10 {0,1,2,3,4,6,8}

14 1110 10 {0,1,2,3,4,5,6,8}14 1110 10 {0,1,2,3,4,5,6,8}

15 1111 保留 (reserved) reserved 15 1111 reserved (reserved) reserved

表 1 Table 1

10 1010 10 { 1, 6, 7}

11 1011 10 { 1, 2, 6, 8}11 1011 10 { 1, 2, 6, 8}

12 1100 10 { 1, 3, 6, 9}12 1100 10 { 1, 3, 6, 9}

13 1101 10 { 1, 4, 6, 7}13 1101 10 { 1, 4, 6, 7}

14 1110 reserved reserved14 1110 reserved reserved

15 1111 reserved reserved 15 1111 reserved reserved

表 2 Table 2

SRS所使用的序列从解调导频序列组中选出，当 UE的 SRS带宽为 4 个资源块（ RB , Resource Block )时，使用长度为 2个 RB的计算机生成（ CG, Computer Generated ) 的序列；当 UE的 SRS带宽大于 4个 RB时，使用对应长度的 Zadoff-Chu ( ZC )序列。 The sequence used by the SRS is selected from the demodulation pilot sequence group. When the SRS bandwidth of the UE is 4 resource blocks (RB, Resource Block), the computer generated (CG, Computer Generated) with a length of 2 RBs is used. Sequence; When the SRS bandwidth of the UE is greater than 4 RBs, a corresponding length of Zadoff-Chu (ZC) sequence is used.

另外，在同一个 SRS带宽内， SRS的子载波（sub-carrier )是间隔放置的，也就是说， SRS的发送釆用梳状结构。 LTE***中的频率梳（frequency comb ) 的数量为 2, 也对应于时域的重复系数值 ( RPF, RePetition Factor ) 为 2。图 4为现有技术 SRS的梳状结构的示意图，图 4中，雪花点小方格表示 Comb=l的情况，斜方格小方格表示 Comb=0的情况。如图 4所示，每个 UE在发送 SRS时，只使用两个频率梳中的一个， comb=0或 comb=l。这样， UE根据 1比特的上层信令的频率梳 comb位置指示，只使用频域索引为偶数或奇数的子载波发送 SRS。这种梳状结构允许更多的 UE在同一 SRS带宽内发送 SRS。 In addition, within the same SRS bandwidth, the sub-carriers of the SRS are placed at intervals, that is, the SRS is transmitted using a comb structure. The number of frequency combs in the LTE system is 2, which also corresponds to a time domain repeat coefficient value (RPF, RePetition Factor) of 2. 4 is a schematic view of a comb structure of a prior art SRS. In FIG. 4, a small square of a snowflake point indicates a case of Comb=l, and a small square of a diagonal square indicates a case of Comb=0. As shown in Figure 4, each UE uses only one of the two frequency combs when sending the SRS, comb=0 or comb=l. Thus, the UE transmits the SRS for the even or odd subcarriers using only the frequency domain index based on the frequency comb comb position indication of the 1-bit upper layer signaling. This comb structure allows more UEs to send SRS within the same SRS bandwidth.

在同一 SRS带宽内，多个 UE可以在同一个频率梳上使用不同的循环移位，然后通过码分复用发送 SRS, 也可以两个 UE在不同的频率梳上，通过频分复用发送 SRS。举例来说，在 LTE***中，在某个 SRS带宽（4个 RB ) 内发送 SRS的 UE, 可以使用的循环移位有 8个，可以使用的频率梳为 2个，所以说 UE总共有 16个可用来发送 SRS的资源，也就是说，在这一 SRS带宽内，最多可以同时发送 16个 SRS。由于在 LTE***中不支持上行单用户多输入多输出（ SU-MIMO, Single User Multiple Input Multiple Output ) , UE在每一时刻只能有一根天线发送 SRS, 所以一个 UE只需要一个 SRS资源，因此，在上述 SRS带宽内， ***最多可以同时复用 16个 UE。 Within the same SRS bandwidth, multiple UEs may use different cyclic shifts on the same frequency comb, and then send SRS through code division multiplexing, or two UEs may be combed on different frequencies and transmitted by frequency division multiplexing. SRS. For example, in an LTE system, a UE that transmits an SRS within a certain SRS bandwidth (4 RBs) can use 8 cyclic shifts and 2 frequency combs that can be used, so the UE has a total of 16 A resource that can be used to send SRS, that is, up to 16 SRSs can be sent simultaneously within this SRS bandwidth. Uplink single-user multiple-input multiple-output (SU-MIMO, Single User Multiple Input Multiple) is not supported in LTE systems. Output ), the UE can only transmit one SRS at each moment, so one UE only needs one SRS resource. Therefore, within the above SRS bandwidth, the system can simultaneously multiplex up to 16 UEs.

高级 LTE ( LTE-A, LTE- Advanced ) ***是 LTE***的下一代演进系统，在上行支持 SU-MIM0,并且最多可以使用 4根天线作为上行发射天线。也就是说， UE在同一时刻可以在多根天线上同时发送 SRS , 而 eNB需要根据每根天线上收到的 SRS来估计每条信道上的状态。 The advanced LTE (LTE-A, LTE-Advanced) system is a next-generation evolution system of the LTE system. It supports SU-MIM0 on the uplink and can use up to 4 antennas as uplink transmit antennas. That is to say, the UE can simultaneously transmit SRS on multiple antennas at the same time, and the eNB needs to estimate the state on each channel according to the SRS received on each antenna.

在协作多点传输***中 ,协作集中的每个基站需要获得基站至 UE的下行链路信道信息，这就要求 UE向协作集中的每个基站反馈下行信道信息，而且反馈量会很大。在 FDD ***中，特别是 TDD ***中，为了降低 UE 的反馈量，基站可以通过测量 SRS , 然后利用信道互易性来获得下行链路信道信息。此时，对上行链路的接收端（基站）来说，如何对 SRS的发送进行合理配置，从而提高接收端（基站）对 SRS的信道估计质量，是一个待解决的问题，目前没有提供具体实现方案。发明内容 In a coordinated multipoint transmission system, each base station in the cooperation set needs to obtain downlink channel information of the base station to the UE, which requires the UE to feed back downlink channel information to each base station in the cooperation set, and the feedback amount is large. In the FDD system, especially in the TDD system, in order to reduce the feedback amount of the UE, the base station can obtain the downlink channel information by measuring the SRS and then using the channel reciprocity. At this time, for the receiving end (base station) of the uplink, how to properly configure the SRS transmission, thereby improving the channel estimation quality of the SRS by the receiving end (base station) is a problem to be solved, and no specific Implementation plan. Summary of the invention

有鉴于此，本发明的主要目的在于提供一种用于协作多点传输***的测量参考信号发送方法及***，能够提高基站对 SRS的信道估计质量，大大降低 UE的反馈量。 In view of this, the main object of the present invention is to provide a method and system for transmitting measurement reference signals for a coordinated multi-point transmission system, which can improve the channel estimation quality of the SRS by the base station and greatly reduce the feedback amount of the UE.

为达到上述目的，本发明的技术方案是这样实现的： In order to achieve the above object, the technical solution of the present invention is achieved as follows:

一种用于协作多点传输***的测量参考信号发送方法，包括：基站设置发送测量参考信号 SRS的配置信息并下发给用户终端； A method for transmitting a measurement reference signal for a coordinated multi-point transmission system, comprising: transmitting, by a base station, configuration information of a measurement reference signal SRS and transmitting the configuration information to a user terminal;

用户终端按照获得的配置信息向基站发送 SRS。 The user terminal transmits an SRS to the base station according to the obtained configuration information.

所述设置发送 SRS的配置信息包括： The setting configuration information for sending the SRS includes:

将配置信息中的协作多点传输***协作集各小区的小区专有子帧周期和小区专有子帧偏置 Δ _SFC设置成一致的。所述设置发送 SRS的配置信息包括： The cell-specific subframe period and the cell-specific subframe offset Δ _{SFC of} each cell of the coordinated multi-point transmission system cooperation set in the configuration information are set to be consistent. The setting configuration information for sending the SRS includes:

在协作小区的配置信息中，将与服务小区的 SRS发送信息所占的时频位置一致的时频资源位置的发射功率设置为 0; 或在协作小区的配置信息中，设置打掉或屏蔽掉协作小区内与服务小区的 SRS发送信息所在的时频资源位置重叠的数据或 SRS; 或根据所接收到的来自协作小区或相邻小区的基站的 SRS资源占用信息和 /或参数配置信息，选择与协作小区或相邻小区基站的 SRS频域位置不重叠的位置作为本小区的 SRS频域位置；或根据所接收到的来自协作小区或相邻小区基站的 SRS资源占用信息和 /或参数配置信息，尽量避免在所述 SRS资源占用信息和 /或参数配置信息所关注的物理资源块上调度本小区内的小区边缘用户。 In the configuration information of the coordinated cell, the transmit power of the time-frequency resource location that matches the time-frequency location occupied by the SRS transmission information of the serving cell is set to 0; or in the configuration information of the coordinated cell, the setting is cancelled or masked. Selecting data or SRS in the coordinated cell that overlaps with the time-frequency resource location where the SRS transmission information of the serving cell is located; or selecting according to the received SRS resource occupation information and/or parameter configuration information of the base station from the coordinated cell or the neighboring cell. The location of the SRS frequency domain that does not overlap with the SRS frequency domain location of the coordinated cell or the neighboring cell base station; or according to the received SRS resource occupation information and/or parameter configuration from the coordinated cell or the neighboring cell base station For information, the cell edge users in the cell are scheduled to be scheduled on the physical resource block concerned by the SRS resource occupation information and/or the parameter configuration information.

优选地，基站设置发送测量参考信号 SRS的配置信息并下发给用户终端的同时，该方法还包括：基站向相邻小区的基站发送消息，其中，该消息包括 SRS资源占用信息和 /或参数配置信息。 Preferably, the base station sets the configuration information of the measurement reference signal SRS and sends the configuration information to the user terminal, and the method further includes: the base station sending a message to the base station of the neighboring cell, where the message includes the SRS resource occupation information and/or the parameter. Configuration information.

优选地，基站通过 X2接口向相邻小区的基站发送消息。 Preferably, the base station sends a message to the base station of the neighboring cell through the X2 interface.

优选地， SRS资源占用信息和 /或参数配置信息包括：各物理资源块上的 SRS占用指示，和 /或 SRS的频率梳位置占用指示，和 /或 SRS的发送序歹 |J , 和 /或 SRS发送带宽，和 /或 SRS起始物理资源块位置，和 /或用户专有的 SRS周期和子帧偏置索引，和 /或 SRS的跳频带宽，和 /或 SRS的循环移位，和 /或 SRS的发射天线数量，和 /或 SRS的持续时间（ duration )。 Preferably, the SRS resource occupation information and/or parameter configuration information includes: an SRS occupation indication on each physical resource block, and/or a frequency comb position occupancy indication of the SRS, and/or a SRS transmission sequence J|J, and/or SRS transmission bandwidth, and/or SRS starting physical resource block location, and/or user-specific SRS period and subframe offset index, and/or SRS hopping bandwidth, and/or SRS cyclic shift, and / Or the number of transmit antennas of the SRS, and/or the duration of the SRS.

该方法还包括：在协作多点传输***中，将 SRS的频率梳数量增加至 The method further includes: increasing the number of frequency combs of the SRS to a coordinated multipoint transmission system to

3或 4; 3 or 4;

所述设置发送 SRS的配置信息包括：在配置信息中设置服务小区中使用协作多点传输的 UE与协作小区的 UE以频分复用 FDM的方式进行正交复用；或设置服务小区中使用协作多点传输的 UE与协作小区的 UE分别使用不同的频率梳。 The setting of the configuration information for sending the SRS includes: setting, in the configuration information, the UE that uses the coordinated multipoint transmission in the serving cell and the UE of the coordinated cell to perform orthogonal multiplexing by means of frequency division multiplexing FDM; or setting the use in the serving cell The coordinated multi-point transmission UE and the coordinated cell UE respectively use different frequency combs.

该方法还包括：在协作集间，通过 X2接口在基站之间，或通过基站内部的接***互协作集各小区的所述配置信息，和 /或协作集中各小区的所述The method further includes: between the cooperative sets, between the base stations through the X2 interface, or through the base station The interface of the part interacts with the configuration information of each cell, and/or the cells of the cooperation set

SRS资源占用信息和 /或参数配置信息；或者， SRS resource occupation information and/or parameter configuration information; or

通过 X2接口向相邻小区的基站发送所述 SRS资源占用信息和 /或参数配置信息。 The SRS resource occupation information and/or parameter configuration information is sent to a base station of a neighboring cell through an X2 interface.

所述交互包括：通过 X2接口在基站之间，或者为用于 CoMP相关信息交互的消息交互所述 SRS资源占用信息和 /或参数配置信息。 The interaction includes: interacting the SRS resource occupation information and/or parameter configuration information between the base stations through the X2 interface or for a message for CoMP related information interaction.

所述协作集中的各小区间相互同步。 The cells in the collaboration set are synchronized with each other.

一种用于协作多点传输***的测量参考信号发送***，包括基站和用户终，其中， A measurement reference signal transmission system for a coordinated multipoint transmission system, including a base station and a user terminal, wherein

基站，用于设置发送 SRS的配置信息并下发给用户终端； a base station, configured to send configuration information of the SRS and send the configuration information to the user terminal;

用户终端，用于按照获得的配置信息向基站发送 SRS。 The user terminal is configured to send an SRS to the base station according to the obtained configuration information.

所述基站具体用于： The base station is specifically configured to:

将配置信息中的、协作多点传输***协作集各小区的小区专有子帧周期⁷^和小区专有子帧偏置 Δ 设置成一致的；或者， Setting a cell-specific subframe period ⁷ ^ and a cell-specific subframe offset Δ of each cell of the coordinated multi-point transmission system cooperation set in the configuration information to be consistent; or

在协作小区的配置信息中，将与服务小区的 SRS发送信息所占的时频位置一致的时频资源位置的发射功率设置为 0; 或在协作小区的配置信息中，设置打掉或屏蔽掉协作小区内与服务小区的 SRS发送信息所在的时频资源位置重叠的数据或 SRS; 或者，根据所接收到的来自协作小区或相邻小区的基站的 SRS资源占用信息和 /或参数配置信息，选择与协作小区或相邻小区基站的 SRS频域位置不重叠的位置作为本小区的 SRS频域位置；或根据所接收到的来自协作小区或相邻小区基站的 SRS资源占用信息和 /或参数配置信息，尽量避免在所述 SRS资源占用信息和 /或参数配置信息所关注的物理资源块上调度本小区内的小区边缘用户。 In the configuration information of the coordinated cell, the transmit power of the time-frequency resource location that matches the time-frequency location occupied by the SRS transmission information of the serving cell is set to 0; or in the configuration information of the coordinated cell, the setting is cancelled or masked. Data or SRS that overlaps with the time-frequency resource location where the SRS transmission information of the serving cell is located in the coordinated cell; or, according to the received SRS resource occupation information and/or parameter configuration information of the base station from the coordinated cell or the neighboring cell, Selecting a location that does not overlap the SRS frequency domain location of the coordinated cell or the neighboring cell base station as the SRS frequency domain location of the current cell; or according to the received SRS resource occupation information and/or parameters from the coordinated cell or the neighboring cell base station The configuration information is used to avoid scheduling cell edge users in the cell on the physical resource block concerned by the SRS resource occupation information and/or parameter configuration information.

优选地，基站设置发送测量参考信号 SRS的配置信息并下发给用户终端的同时，还包括：基站向相邻小区的基站发送消息，其中，该消息包括 SRS资源占用信息和 /或参数配置信息。 Preferably, the base station sets the configuration information of the measurement reference signal SRS and sends the configuration information to the user terminal, and the method further includes: the base station sending a message to the base station of the neighboring cell, where the message includes SRS resource occupancy information and/or parameter configuration information.

优选地， SRS资源占用信息和 /或参数配置信息包括：各物理资源块上的 SRS占用指示，和 /或 SRS的频率梳位置占用指示，和 /或 SRS的发送序列，和 /或 SRS发送带宽，和 /或 SRS起始物理资源块位置，和 /或用户专有的 SRS周期和子帧偏置索引，和 /或 SRS的跳频带宽，和 /或 SRS的循环移位，和 /或 SRS的发射天线数量，和 /或 SRS的持续时间（duration ), 或者，在协作多点传输***中，将 SRS的频率梳数量增加至 3或 4, 并在配置信息中设置服务小区中使用协作多点传输的 UE与协作小区的 UE以频分复用的方式进行正交复用；或设置服务小区中使用协作多点传输的 UE与协作小区的 UE分别使用不同的频率梳。 Preferably, the SRS resource occupation information and/or parameter configuration information includes: an SRS occupation indication on each physical resource block, and/or a frequency comb location occupancy indication of the SRS, and/or a SRS transmission sequence, and/or an SRS transmission bandwidth. And/or SRS starting physical resource block location, and/or user-specific SRS period and subframe offset index, and/or SRS hopping bandwidth, and/or SRS cyclic shift, and/or SRS The number of transmit antennas, and/or the duration of the SRS, or, in a coordinated multipoint transmission system, increase the number of frequency combs of the SRS to 3 or 4, and set the coordinated multipoint in the serving cell in the configuration information. The transmitted UE and the UE of the coordinated cell perform orthogonal multiplexing in a frequency division multiplexing manner; or the UE in the serving cell that uses coordinated multipoint transmission and the UE in the coordinated cell respectively use different frequency combs.

从上述本发明提供的技术方案可以看出，包括基站设置发送 SRS的配置信息并下发给用户终端，用户终端按照获得的配置信息向基站发送 SRS。通过本发明方法，提高了协作集中的每个基站对 SRS的信道估计质量，从而基站可利用信道互易性来获得下行链路信道信息，大大降低了 UE的反馈量。附图说明 It can be seen from the technical solution provided by the present invention that the base station sets the configuration information of the SRS to be sent to the user terminal, and the user terminal sends the SRS to the base station according to the obtained configuration information. By the method of the invention, the channel estimation quality of the SRS is improved by each base station in the cooperation set, so that the base station can use the channel reciprocity to obtain the downlink channel information, which greatly reduces the feedback amount of the UE. DRAWINGS

图 la为现有技术中，釆用普通循环前缀时， DMRS时域位置的示意图；图 lb为现有技术中，釆用扩展循环前缀时， DMRS时域位置的示意图；图 2为现有多点传输的基本原理和多小区联合处理的结构图；图 3为现有技术中分配不同 "^c的 UE发送 SRS的频域初始位置的示意图； FIG. 1B is a schematic diagram of a DMRS time domain position when a normal cyclic prefix is used in the prior art; FIG. 1b is a schematic diagram of a DMRS time domain position when an extended cyclic prefix is used in the prior art; The basic principle of point transmission and the structure diagram of the multi-cell joint processing; FIG. 3 is a schematic diagram of the frequency domain initial position of the UE transmitting different SMSs in the prior art;

图 4为现有技术 SRS的梳状结构的示意图； 4 is a schematic view of a comb structure of a prior art SRS;

图 5为本发明用于协作多点传输***的 SRS配置方法的流程图。具体实施方式 FIG. 5 is a flowchart of an SRS configuration method for a coordinated multipoint transmission system according to the present invention. detailed description

图 5为本发明用于协作多点传输***的 SRS配置方法的流程图，如图 5所示，包括： FIG. 5 is a flowchart of a method for configuring an SRS for a coordinated multipoint transmission system according to the present invention. As shown in FIG. 5, the method includes:

步骤 500: 基站设置发送 SRS的配置信息并下发给用户终端。 Step 500: The base station sets the configuration information of the SRS to be sent to the user terminal.

本步骤中，设置发送 SRS的配置信息的方法为： In this step, the method for setting the configuration information for sending SRS is as follows:

将配置信息中的协作多点传输***协作集各小区的小区专有子帧周期 FC和小区专有子帧偏置 ^Δ 设置成一致的，这样协作集中的各小区在相同的时刻发送 SRS, 提高了信道估计的质量；或者， The cell-specific subframe period FC and the cell-specific subframe offset ^{Δ of} each cell of the coordinated multi-point transmission system cooperation set in the configuration information are set to be consistent, so that each cell in the cooperation group transmits the SRS at the same time, thereby improving The quality of the channel estimate; or,

在协作小区的配置信息中，将与服务小区的 SRS发送信息所占的时频位置一致的时频资源位置的发射功率设置为 0, 这里，协作多点传输***的协作小区基站可以通过高层信令将该配置信息指示给其小区内的 UE; 或在协作小区的配置信息中，设置打掉（drop )或屏蔽（muting )掉协作小区内与服务小区的 SRS发送信息所在的时频资源位置重叠的数据或 SRS;或者，根据所接收到的来自协作小区或相邻小区的基站的 SRS 资源占用信息和 / 或参数配置信息，选择与协作小区或相邻小区基站的 SRS频域位置不重叠的位置作为本小区的 SRS频域位置；或根据所接收到的来自协作小区或相邻小区基站的 SRS资源占用信息和 /或参数配置信息，尽量避免在所述 SRS 资源占用信息和 /或参数配置信息所关注的物理资源块上调度本小区内的小区边缘用户。 In the configuration information of the coordinated cell, the transmit power of the time-frequency resource location that matches the time-frequency location occupied by the SRS transmission information of the serving cell is set to 0, where the coordinated cell base station of the coordinated multi-point transmission system can pass the high-level letter. The configuration information is indicated to the UE in the cell; or in the configuration information of the coordinated cell, the time-frequency resource location where the SRS transmission information in the coordinated cell and the serving cell is located is set or dropped Overlapping data or SRS; or, according to the received SRS resource occupation information and/or parameter configuration information of the base station from the coordinated cell or the neighboring cell, selecting the SRS frequency domain position of the coordinated cell or the neighboring cell base station does not overlap The location is the SRS frequency domain location of the current cell; or the SRS resource occupation information and/or parameter configuration information from the coordinated cell or the neighboring cell base station is received, and the SRS resource occupation information and/or parameters are avoided as much as possible. The cell edge user in the cell is scheduled on the physical resource block concerned by the configuration information.

优选地，基站设置发送测量参考信号 SRS的配置信息并下发给用户终端的同时，还包括：基站向相邻小区的基站发送消息，其中，该消息包括 SRS资源占用信息和 /或参数配置信息。 Preferably, the base station sets the configuration information of the measurement reference signal SRS and sends the configuration information to the user terminal, and the method further includes: the base station sending a message to the base station of the neighboring cell, where the message includes the SRS resource occupation information and/or the parameter configuration information. .

优选地， SRS资源占用信息和 /或参数配置信息包括：各物理资源块上的 SRS占用指示，和 /或 SRS的频率梳位置占用指示，和 /或 SRS的发送序列，和 /或 SRS发送带宽，和 /或 SRS起始物理资源块位置，和 /或用户专有的 SRS周期和子帧偏置索引，和 /或 SRS的跳频带宽，和 /或 SRS的循环移位，和 /或 SRS的发射天线数量，和 /或 SRS的持续时间（duration )等。 Preferably, the SRS resource occupation information and/or parameter configuration information includes: an SRS occupation indication on each physical resource block, and/or a frequency comb position occupancy indication of the SRS, and/or a SRS transmission sequence. Column, and/or SRS transmission bandwidth, and/or SRS starting physical resource block location, and/or user-specific SRS period and subframe offset index, and/or SRS hopping bandwidth, and/or SRS loop Shift, and/or the number of transmit antennas of the SRS, and/or the duration of the SRS, etc.

在协作多点传输***中，将 SRS的频率梳数量增加至 3或 4, 并在配置信息中设置服务小区中使用协作多点传输的 UE与协作小区的 UE以频分复用（FDM ) 的方式进行正交复用，即分别使用不同的频率梳，或设置服务小区中使用协作多点传输的 UE与协作小区的 UE分别使用不同的频率梳。 In the coordinated multipoint transmission system, the number of frequency combs of the SRS is increased to 3 or 4, and the UE in the serving cell using the coordinated multipoint transmission and the UE in the coordinated cell are frequency division multiplexed (FDM) in the configuration information. The method performs orthogonal multiplexing, that is, respectively, using different frequency combs, or setting UEs that use coordinated multipoint transmission in the serving cell and UEs of the coordinated cell to use different frequency combs respectively.

进一步地，本步骤还包括：协作集各小区的配置信息和 /或协作集中各小区的 SRS资源占用信息和 /或参数配置信息在协作集之间进行交互，具体包括：通过 X2接口在基站之间（ inter cite/cell ), 或通过基站内部的接口在基站内部（ intra cite/cell )进行交互。其中，协作集中的各小区之间相互同步。 Further, the step further includes: performing, by using the X2 interface, the base station by using the configuration information of the cells of the cooperation set and/or the SRS resource occupation information and/or the parameter configuration information of the cells in the cooperation set. Inter cite/cell, or interact within the base station (intra cite/cell) through an interface inside the base station. Among them, the cells in the collaborative set are synchronized with each other.

步骤 501：用户终端按照获得的配置信息向基站发送 SRS。 Step 501: The user terminal sends an SRS to the base station according to the obtained configuration information.

这样，接收端（基站）就可以根据协作集中交互的配置信息，对接收到的 SRS使用线性最小均方误差（LMMSE )或最小均方误差（MMSE )或其他的信道估计方法来进行准确的信道估计，从而实现可靠的协作多点下行传输。需要说明的是，信道估计的具体实现方法不属于本发明的保护范围，其具体实现也不用于限定本发明的保护范围。 In this way, the receiving end (base station) can use the linear minimum mean square error (LMMSE) or the minimum mean square error (MMSE) or other channel estimation methods to perform accurate channel on the received SRS according to the configuration information of the cooperative centralized interaction. It is estimated to achieve reliable coordinated multi-point downlink transmission. It should be noted that the specific implementation method of the channel estimation does not belong to the protection scope of the present invention, and the specific implementation thereof is not limited to the scope of protection of the present invention.

针对本发明方法，还提供一种用于协作多点传输***的测量参考信号发送***，包括基站和用户终端，其中， A method for transmitting a reference signal transmission system for a coordinated multipoint transmission system, including a base station and a user terminal,

基站，用于设置发送 SRS的配置信息并下发给用户终端。具体用于：将配置信息中的协作多点传输***协作集各小区的小区专有子帧周期和小区专有子帧偏置 Δ 设置成一致的；或者， The base station is configured to send configuration information of the SRS and send the configuration information to the user terminal. The method is specifically configured to: set a cell-specific subframe period and a cell-specific subframe offset Δ of each cell of the coordinated multi-point transmission system cooperation set in the configuration information to be consistent; or

在协作小区的配置信息中，将与服务小区的 SRS发送信息所占的时频位置一致的时频资源位置的发射功率设置为 0, 这里，协作多点传输***的协作小区基站可以通过高层信令将该配置信息指示给其小区内的 UE; 或在协作小区的配置信息中，设置打掉（drop )或屏蔽（muting )掉协作小区内与服务小区的 SRS发送信息所在的时频资源位置重叠的数据或 SRS;或者，根据所接收到的来自协作小区或相邻小区的基站的 SRS 资源占用信息和 / 或参数配置信息，选择与协作小区或相邻小区基站的 SRS频域位置不重叠的位置作为本小区的 SRS频域位置；或根据所接收到的来自协作小区或相邻小区基站的 SRS资源占用信息和 /或参数配置信息，尽量避免在所述 SRS 资源占用信息和 /或参数配置信息所关注的物理资源块上调度本小区内的小区边缘用户。 In the configuration information of the coordinated cell, the time frequency occupied by the information transmitted by the SRS of the serving cell The transmit power of the location-consistent time-frequency resource location is set to 0. Here, the coordinated cell base station of the coordinated multi-point transmission system may indicate the configuration information to the UE in the cell by using the high layer signaling; or in the configuration information of the coordinated cell. And setting (drop) or muting off data or SRS overlapping in the time-frequency resource location of the SRS transmission information of the serving cell in the coordinated cell; or, according to the received from the coordinated cell or the neighboring cell The SRS resource occupation information and/or parameter configuration information of the base station is selected as a location of the SRS frequency domain of the current cell that does not overlap with the SRS frequency domain location of the coordinated cell or the neighboring cell base station; or according to the received coordinated cell or The SRS resource occupation information and/or parameter configuration information of the neighboring cell base station is used to avoid scheduling the cell edge users in the current cell on the physical resource block concerned by the SRS resource occupation information and/or the parameter configuration information.

优选地， SRS资源占用信息和 /或参数配置信息包括：各物理资源块上的 SRS占用指示，和 /或 SRS的频率梳位置占用指示，和 /或 SRS的发送序歹 |J , 和 /或 SRS发送带宽，和 /或 SRS起始物理资源块位置，和 /或用户专有的 SRS周期和子帧偏置索引，和 /或 SRS的跳频带宽，和 /或 SRS的循环移位，和 /或 SRS的发射天线数量，和 /或 SRS的持续时间（duration )等。。 Preferably, the SRS resource occupation information and/or parameter configuration information includes: an SRS occupation indication on each physical resource block, and/or a frequency comb position occupancy indication of the SRS, and/or a SRS transmission sequence J|J, and/or SRS transmission bandwidth, and/or SRS starting physical resource block location, and/or user-specific SRS period and subframe offset index, and/or SRS hopping bandwidth, and/or SRS cyclic shift, and / Or the number of transmit antennas of the SRS, and/or the duration of the SRS, etc. .

优选地，通过 X2接口发送的 UE-specific SRS参数信息，即所交互的信息内容包括以下一个或几个 UE-specific SRS参数： Preferably, the UE-specific SRS parameter information sent by the X2 interface, that is, the information content of the interaction includes one or several UE-specific SRS parameters:

SRS的带宽（ srs-Bandwidth/srs-BandwidthAp ),设置为： ENUMERATED {bwO, bwl , bw2, bw3 } ; The bandwidth of SRS ( srs-Bandwidth/srs-BandwidthAp ) is set to: ENUMERATED {bwO, bwl , bw2, bw3 } ;

频域 Hopping的带宽（ srs-HoppingBandwidth )，设置为： ENUMERATED {hbwO, hbwl , hbw2, hbw3 } ; The bandwidth of the frequency domain Hopping ( srs-HoppingBandwidth ) is set to: ENUMERATED {hbwO, hbwl , hbw2, hbw3 } ;

分配的物理资源块起始位置 ( freqDomainPosition/freqDomainPositionAp ), 设置为： NTEGER ( 0...23 );The starting position of the allocated physical resource block ( freqDomainPosition/freqDomainPositionAp ), set to: NTEGER ( 0...23 );

SRS传输周期（单次或直到不使能）（duration), 设置为 BOOLEAN;SRS transmission period (single or until not enabled) (duration), set to BOOLEAN;

SRS配置索引（ srs-Configlndex/srs-ConfiglndexAp )表示了周期和起始子帧，设置为 INTEGER (0..1023 ) /INTEGER (0..32 ); The SRS configuration index ( srs-Configlndex/srs-ConfiglndexAp ) represents the period and start subframe, set to INTEGER (0..1023 ) /INTEGER (0..32 );

传输结构 ( transmissionComb/transmissionCombAp ) , 设置为 INTEGER (0, 1, 2, 3 ); The transmission structure ( transmissionComb/transmissionCombAp ) is set to INTEGER (0, 1, 2, 3 );

序列的循环移位量（cyclicShift/cyclicShiftAp), 设置为 ENUMERATED {csO, csl, cs2, cs3, cs4, cs5, cs6, cs7}。 The cyclic shift amount of the sequence (cyclicShift/cyclicShiftAp) is set to ENUMERATED {csO, csl, cs2, cs3, cs4, cs5, cs6, cs7}.

SRS 发送天线数量 ( srs-AntennaPort/srs-AntennaPortAp ) , 设置为 INTEGER (0, 1, 2, 4); SRS transmit antenna number ( srs-AntennaPort/srs-AntennaPortAp ), set to INTEGER (0, 1, 2, 4);

IE格式如下表 3所示: The IE format is shown in Table 3 below:

表 3 在协作多点传输***中，将 SRS的频率梳数量增加至 3或 4, 并在配置信息中设置服务小区中使用协作多点传输的 UE与协作小区的 UE以频分复用（FDM ) 的方式进行正交复用，即分别使用不同的频率梳；或设置服务小区中使用协作多点传输的 UE与协作小区的 UE分别使用不同的频率梳。 table 3 In the coordinated multipoint transmission system, the number of frequency combs of the SRS is increased to 3 or 4, and the UE in the serving cell using the coordinated multipoint transmission and the UE in the coordinated cell are frequency division multiplexed (FDM) in the configuration information. The method performs orthogonal multiplexing, that is, respectively using different frequency combs; or setting UEs using coordinated multipoint transmission in the serving cell and UEs of the coordinated cell respectively using different frequency combs.

下面结合实施例对本发明方法进行详细描述。 The method of the present invention will be described in detail below with reference to the embodiments.

第一实施例， 4叚设在配置信息中，将协作多点传输***协作集各小区的小区专有子帧周期 ^Τ^和小区专有子帧偏置设置成一致的，协作集各小区的配置信息和 /或协作集中各小区的 SRS 资源占用信息和 /或参数配置信息在协作集之间进行交互。 The first embodiment is configured to set, in the configuration information, a cell-specific subframe period ^各 and a cell-specific subframe offset of each cell of the coordinated multi-point transmission system cooperation set to be consistent, The SRS resource occupation information and/or parameter configuration information of each cell in the configuration information and/or the cooperation set interacts between the collaboration sets.

协作集各小区的配置信息通过 X2接口在基站之间（ inter cite/cell )或通过基站内部的接口在基站内部（ intra cite/cell )进行交互。基站根据协作集中交互的配置信息，对接收到的 SRS使用线性最小均方误差（LMMSE ) 的信道估计方法来进行准确的信道估计。 LMMSE的信道估计方法如公式 (1) 所示，第 k个用户或第 k条发射接收天线链路的信道估计为： The configuration information of each cell of the cooperation set interacts between the base stations (inter cite/cell) or through the internal interface of the base station (intra cite/cell) through the X2 interface. The base station performs accurate channel estimation on the received SRS using a linear minimum mean square error (LMMSE) channel estimation method according to the configuration information of the cooperative centralized interaction. The channel estimation method of the LMMSE is as shown in the formula (1), and the channel estimation of the kth user or kth transmitting and receiving antenna link is:

H_k = ^E(h_kh_k ^H )S_k ^H (∑ P^EihA^S " + R_{I +} a²I_eyer^ly H _k = ^E(h _k h _k ^H )S _k ^H (∑ P^EihA^S " + R _{I +} a ² I _eye r ^l y

'=ι (1) 公式 (1)中， A为第 k个用户或第 k条发射接收天线链路的发射功率，表示第 k个用户或第 k条发射接收天线链路的频域相关值，为第 k个用户或第 k条发射接收天线链路发送的 SRS符号序列， ^Η为的共轭转置， ^{R = £}{ ^{x ff}}， /为其他小区的用户干扰，可从协作集小区间的信息交互中得到， ²为噪声功率，为单位阵， y为接收端接收到的信号。 '=ι (1) In equation (1), A is the transmit power of the kth user or kth transmit and receive antenna link, indicating the frequency domain correlation value of the kth user or kth transmit receive antenna link , the SRS symbol sequence to user k or k-th receive antenna transmission link transmission, ^[eta] is the conjugate ^{^{transpose, R = £ {x ff}}} , / other cell interference for a user, a cooperating set from the cells In the information interaction between the ^two , ² is the noise power, is the unit matrix, y is the signal received by the receiver.

估计出信道后，基站利用信道互易性来获得下行信道信息，以实现可靠的协作多点下行传输。 After estimating the channel, the base station uses channel reciprocity to obtain downlink channel information to implement Reliable collaborative multi-point downlink transmission.

第二实施例， 4叚设在协作小区的配置信息中，协作多点传输***的协作小区基站通过高层信令，指示其小区内的 UE设置相应的时频资源位置的发射功率为 0, 该时频资源位置与服务小区的 SRS发送信息所占的时频位置一致；或者，打掉（drop )或屏蔽（muting )掉协作小区内与服务小区的 SRS发送信息所在的时频资源位置重叠的数据或 SRS; 或者，根据所接收到的来自协作小区基站的 SRS占用指示信息，选择与协作小区基站的 SRS 频域位置不重叠的位置作为本小区的 SRS频域位置；或者，根据所接收到的来自协作小区基站的 SRS占用指示信息，尽量避免在所述 SRS占用指示信息所关注的物理资源块上调度本小区内的小区边缘用户。并且，协作集各小区的配置信息和 /或协作集中各小区的 SRS占用指示信息在协作集之间进行交互。 In a second embodiment, the coordinated cell base station of the coordinated multi-point transmission system indicates that the UE in the cell sets the transmit power of the corresponding time-frequency resource location to 0 through the high-layer signaling. The time-frequency resource location is consistent with the time-frequency location occupied by the SRS transmission information of the serving cell; or, the location of the time-frequency resource in which the SRS transmission information of the serving cell overlaps with the serving cell is overlapped or muted Data or SRS; or, according to the received SRS occupation indication information from the coordinated cell base station, selecting a location that does not overlap with the SRS frequency domain location of the coordinated cell base station as the SRS frequency domain location of the local cell; or, according to the received The SRS occupation indication information from the coordinated cell base station is used to avoid scheduling the cell edge users in the local cell on the physical resource block concerned by the SRS occupation indication information. And, the configuration information of each cell of the cooperation set and/or the SRS occupation indication information of each cell in the cooperation set are exchanged between the cooperation sets.

协作集各小区的配置信息通过 X2接口在基站之间（ inter cite/cell )或通过基站内部的接口在基站内部（ intra cite/cell )进行交互。基站根据协作集中交互的配置信息，对接收到的 SRS使用线性最小均方误差（LMMSE ) 的信道估计方法来进行准确的信道估计。本实施例中，接收端接收到的 SRS , 其邻区干 ·ί尤为 0。 LMMSE 的信道估计方法如公式（1)所示，其中 The configuration information of each cell of the cooperation set interacts between the base stations (inter cite/cell) or through the internal interface of the base station (intra cite/cell) through the X2 interface. The base station performs accurate channel estimation on the received SRS using a linear minimum mean square error (LMMSE) channel estimation method according to the configuration information of the cooperative centralized interaction. In this embodiment, the SRS received by the receiving end has a neighboring area of ί, especially 0. The channel estimation method of LMMSE is as shown in formula (1), wherein

^{R = jE}{ ^{x ff}}， /为其他小区的用户干扰，为 0。 ^{R = jE} { ^{x ff} }, / is the user interference of other cells, is 0.

估计出信道 ^后，基站利用信道互易性来获得下行信道信息，以实现可靠的协作多点下行传输。 After estimating the channel ^, the base station uses the channel reciprocity to obtain the downlink channel information to achieve reliable coordinated multi-point downlink transmission.

第三实施例， 4叚设在协作多点传输***中，将 SRS的频率梳数量增加至 3或 4,在配置信息中设置服务小区中使用协作多点传输的 UE与协作小区的 UE以频分复用的方式进行正交复用，即分别使用不同的频率梳；或设置服务小区中使用协作多点传输的 UE与协作小区的 UE分别使用不同的频率梳。协作集各小区的配置信息和 /或协作集中各小区的 SRS占用指示信息在协作集之间进行交互。 The third embodiment is configured to increase the number of frequency combs of the SRS to 3 or 4 in the coordinated multipoint transmission system, and set, in the configuration information, the UE in the serving cell that uses the coordinated multipoint transmission and the UE in the coordinated cell. The multiplexing multiplexing method performs orthogonal multiplexing, that is, different frequency combs are respectively used; or the UEs that use coordinated multipoint transmission in the serving cell and the UEs of the coordinated cell respectively use different frequency combs. Coordination set configuration information of each cell and/or SRS occupation indication information of each cell in the cooperation set Interact between collaboration sets.

第三实施例中，通过对相邻小区使用不同的频率梳 comb, 以 FDM的方式解决了服务小区 CoMP UE和协作小区非 CoMP UE的干扰问题。 In the third embodiment, the interference problem between the serving cell CoMP UE and the coordinated cell non-CoMP UE is solved in an FDM manner by using different frequency comb combs for neighboring cells.

协作集各小区的发送信息和 /或配置信息通过 X2接口在基站之间（ inter cite/cell )或通过基站内部的接口在基站内部 ( intra cite/cell )进行交互。基站根据协作集中交互的配置信息，对接收到的 SRS使用线性最小均方误差 ( LMMSE )的信道估计方法来进行准确的信道估计。本实施例中，接收端接收到的 SRS, 其邻区干扰为 0。 LMMSE的信道估计方法如公式 (1)所示，其中 ^{R = £}{ ^{x ff}}， /为其他小区的用户干扰，为 0。估计出信道后，基站利用信道互易性来获得下行信道信息，以实现可靠的协作多点下行传输。 The transmission information and/or configuration information of each cell of the cooperation set interacts between the base stations (inter cite/cell) or through the internal interface of the base station (intra cite/cell) through the X2 interface. The base station performs accurate channel estimation on the received SRS using a linear minimum mean square error (LMMSE) channel estimation method according to the configuration information of the cooperative centralized interaction. In this embodiment, the SRS received by the receiving end has a neighboring zone interference of zero. The channel estimation method of the LMMSE is as shown in the formula (1), where ^{R = £} { ^{x ff} }, / is the user interference of other cells, and is 0. After estimating the channel, the base station uses channel reciprocity to obtain downlink channel information to achieve reliable coordinated multi-point downlink transmission.

以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。 The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention.

Claims

权利要求书 Claim

1、一种用于协作多点传输***的测量参考信号发送方法，其特征在于，包括：基站设置发送测量参考信号 SRS的配置信息并下发给用户终端；用户终端按照获得的配置信息向基站发送 SRS。 A method for transmitting a measurement reference signal for a coordinated multi-point transmission system, comprising: a base station setting configuration information for transmitting a measurement reference signal SRS and transmitting the configuration information to a user terminal; and the user terminal according to the obtained configuration information to the base station Send SRS.

2、根据权利要求 1所述的测量参考信号发送方法，其特征在于，所述设置发送 SRS的配置信息包括： 2. The method for transmitting measurement reference signals according to claim 1, wherein the setting configuration information for transmitting the SRS comprises:

将配置信息中的协作多点传输***协作集各小区的小区专有子帧周期 F_C和小区专有子帧偏置 A _SFC设置成一致的。 The cell-specific subframe period F _C and the cell-specific subframe offset A _{SFC of} each cell of the coordinated multi-point transmission system cooperation set in the configuration information are set to be consistent.

3、根据权利要求 1所述的测量参考信号发送方法，其特征在于，所述设置发送 SRS的配置信息包括： The method for transmitting a measurement reference signal according to claim 1, wherein the setting the configuration information for transmitting the SRS comprises:

4、根据权利要求 1所述的测量参考信号发送方法，其特征在于，所述基站设置发送测量参考信号 SRS的配置信息并下发给用户终端的同时，该方法还包括：所述基站向相邻小区的基站发送消息，其中，所述消息包括 SRS资源占用信息和 /或参数配置信息。 The method for transmitting a measurement reference signal according to claim 1, wherein the base station sets the configuration information of the measurement reference signal SRS and sends the configuration information to the user terminal, the method further includes: The base station of the neighboring cell sends a message, where the message includes SRS resource occupation information and/or parameter configuration information.

5、根据权利要求 3或 4所述的测量参考信号发送方法，其特征在于，所述 SRS 资源占用信息和 /或参数配置信息包括：各物理资源块上的 SRS 占用指示，和 /或 SRS的频率梳位置占用指示，和 /或 SRS的发送序列，和 / 或 SRS发送带宽，和 /或 SRS起始物理资源块位置，和 /或用户专有的 SRS 周期和子帧偏置索引，和 /或 SRS的跳频带宽，和 /或 SRS的循环移位，和 / 或 SRS的发射天线数量，和 /或 SRS的持续时间。 The method for transmitting measurement reference signals according to claim 3 or 4, wherein the SRS resource occupation information and/or parameter configuration information comprises: SRS on each physical resource block. Occupancy indication, and/or frequency comb position occupancy indication of SRS, and/or SRS transmission sequence, and/or SRS transmission bandwidth, and/or SRS starting physical resource block location, and/or user-specific SRS period and sub- The frame offset index, and/or the hopping bandwidth of the SRS, and/or the cyclic shift of the SRS, and/or the number of transmit antennas of the SRS, and/or the duration of the SRS.

6、根据权利要求 1所述的测量参考信号发送方法，其特征在于，该方法还包括：在协作多点传输***中，将 SRS的频率 υ数量增加至 3或 4; 所述设置发送 SRS的配置信息包括：在配置信息中设置服务小区中使用协作多点传输的 UE与协作小区的 UE以频分复用 FDM的方式进行正交复用；或设置服务小区中使用协作多点传输的 UE与协作小区的 UE分别使用不同的频率梳。 The method for transmitting a measurement reference signal according to claim 1, further comprising: increasing a frequency υ of the SRS to 3 or 4 in the coordinated multipoint transmission system; The configuration information includes: setting, in the configuration information, a UE that uses coordinated multipoint transmission in a serving cell and a UE of a coordinated cell to perform orthogonal multiplexing by means of frequency division multiplexing FDM; or setting a UE that uses coordinated multipoint transmission in a serving cell Different frequency combs are used for the UEs of the coordinated cell.

7、根据权利要求 1~4、 6任一项所述的测量参考信号发送方法，其特征在于，该方法还包括：在协作集间，通过 Χ2接口在基站之间，或通过基站内部的接***互协作集各小区的所述配置信息，和 /或协作集中各小区的所述 SRS资源占用信息和 /或参数配置信息；或者， The method for transmitting a measurement reference signal according to any one of claims 1 to 4, wherein the method further comprises: between the cooperation sets, between the base stations through the Χ2 interface, or through an interface inside the base station. Interacting the set configuration information of each cell, and/or the SRS resource occupation information and/or parameter configuration information of each cell in the cooperation set; or

通过 Χ2接口向相邻小区的基站发送所述 SRS资源占用信息和 /或参数配置信息。 The SRS resource occupation information and/or parameter configuration information is sent to the base station of the neighboring cell through the Χ2 interface.

8、根据权利要求 7所述的测量参考信号发送方法，其特征在于，所述交互包括：通过 Χ2接口的负荷信息消息，或者为用于 CoMP相关信息交互的消息交互所述 SRS资源占用信息和 /或参数配置信息。 The method for transmitting measurement reference signals according to claim 7, wherein the interaction comprises: interacting with the SRS resource occupation information through a load information message of the Χ2 interface, or a message for CoMP related information interaction. / or parameter configuration information.

9、根据权利要求 7所述的测量参考信号发送方法，其特征在于，所述协作集中的各小区间相互同步。 The measurement reference signal transmission method according to claim 7, wherein each of the cells in the cooperation set is synchronized with each other.

10、一种用于协作多点传输***的测量参考信号发送***，其特征在于，包括基站和用户终，其中， 10. A measurement reference signal transmission system for a coordinated multi-point transmission system, characterized by comprising a base station and a user terminal, wherein

11、根据权利要求 10所述的测量参考信号发送***，其特征在于，所述基站具体用于： 11. The measurement reference signal transmission system according to claim 10, wherein The base station is specifically used for:

将配置信息中的、协作多点传输***协作集各小区的小区专有子帧周期⁷^和小区专有子帧偏置 A_SFC设置成一致的；或者， Setting the cell-specific subframe period ⁷ ^ and the cell-specific subframe offset A _{SFC of} each cell of the coordinated multi-point transmission system cooperation set in the configuration information to be consistent; or

在协作小区的配置信息中，将与服务小区的 SRS发送信息所占的时频位置一致的时频资源位置的发射功率设置为 0; 或在协作小区的配置信息中，设置打掉或屏蔽掉协作小区内与服务小区的 SRS发送信息所在的时频资源位置重叠的数据或 SRS; 或者， In the configuration information of the coordinated cell, the transmit power of the time-frequency resource location that matches the time-frequency location occupied by the SRS transmission information of the serving cell is set to 0; or in the configuration information of the coordinated cell, the setting is cancelled or masked. Data or SRS overlapping with the time-frequency resource location where the SRS transmission information of the serving cell is located in the coordinated cell; or

在协作多点传输***中，将 SRS的频率梳数量增加至 3或 4, 并在配置信息中设置服务小区中使用协作多点传输的 UE与协作小区的 UE以频分复用的方式进行正交复用；或设置服务小区中使用协作多点传输的 UE与协作小区的 UE分别使用不同的频率梳。 In the coordinated multi-point transmission system, the number of frequency combs of the SRS is increased to 3 or 4, and the UE in the serving cell using the coordinated multipoint transmission and the UE in the coordinated cell are set to perform frequency division multiplexing in the configuration information. Cross-multiplexing; or setting the UE in the serving cell using coordinated multi-point transmission and the UE in the coordinated cell to use different frequency combs respectively.