WO2016004884A1 - 一种基站、ue中的大尺度mimo通信方法和设备 - Google Patents

一种基站、ue中的大尺度mimo通信方法和设备 Download PDF

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WO2016004884A1
WO2016004884A1 PCT/CN2015/083668 CN2015083668W WO2016004884A1 WO 2016004884 A1 WO2016004884 A1 WO 2016004884A1 CN 2015083668 W CN2015083668 W CN 2015083668W WO 2016004884 A1 WO2016004884 A1 WO 2016004884A1
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signaling
ports
positive integer
base station
port
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French (fr)
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张晓博
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Shanghai Langbo Communication Technology Co Ltd
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Shanghai Langbo Communication Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a channel state measurement and feedback scheme in the field of mobile communication technologies, and in particular, to a downlink channel state measurement and a feedback scheme in a mobile communication system using Massive MIMO (Massive Multiple Input Multiple Output) technology. .
  • Massive MIMO Massive Multiple Input Multiple Output
  • the UE User Equipment
  • the implicit CSI includes PTI (Precoding Type Indicator), RI (Rank Indicator), CQI (Channel Quality Indicator), PMI (Precoding Matrix) Indicator, precoding matrix indication) and other information.
  • CSI-RS pattern based on Normal CP Normal Cyclic Prefix
  • CRS CRS
  • DMRS Demodulation Reference Signal
  • the grid is the smallest resource unit of LTE - RE (Resource Element).
  • the digitally filled RE is a pattern of the CSI-RS port in the subframe (the digital representation port index), the RE identified by the cross line can be used to transmit the DMRS, and the RE identified by the bold line can be used to transmit the CRS.
  • the LTE system uses the concept of a port to define an RS (Reference Signal) resource: an RS port may be mapped to a physical antenna, or a plurality of physical antennas may be combined to form a virtual antenna.
  • LTE defines the number of four CSI-RS ports: 1, 2, 4, 8.
  • the REs marked with numbers in Figure 1 illustrate a pattern of patterns for a set of 8 CSI-RS ports. The number indicates the port index.
  • the UE sends the uplink SRS, and the system side obtains the uplink channel CSI by demodulating the SRS, and then obtains the downlink CSI according to the link symmetry.
  • This method is mainly applicable to the TDD (Time Duplex Division) system.
  • Massive MIMO has recently become a research hotspot.
  • a typical feature of a Massive MIMO system is to obtain a series of gains by increasing the number of antenna array elements to a larger value.
  • the system capacity theoretically increases with the number of antennas; the coherent superposition of the transmit antenna signals reduces the transmit power. and many more.
  • the precoding vector used by the serving cell is parallel (or nearly parallel) to the channel between the UE (User Equipment) of the neighboring cell of the serving cell
  • one challenge faced by Massive MIMO is: downlink precoding Operation may cause significant interference to neighboring cells.
  • the above challenges are particularly acute during SRS contamination.
  • the column vectors v 1 , v 2 are parallel, ie (v 1 ) H ⁇ v 2 /
  • 1, where x H ,
  • the present invention proposes an inter-cell interference cancellation scheme suitable for Massive MIMO transmission.
  • the invention discloses a large-scale MIMO communication method in a base station, which comprises the following steps:
  • Step A Sending first signaling, the first signaling indicating configuration information of the first RS, and the first RS includes M RS ports
  • Step B Receive second signaling, the second signaling indicating M1 RS ports in the first RS
  • the M is a positive integer greater than 1, and the M1 is a positive integer less than or equal to the M.
  • the transmitting cell of the first RS is a cell other than the transmitting cell of the first signaling.
  • the first signaling is RRC (Radio Resource Control) layer signaling.
  • the second signaling is RRC layer signaling.
  • the configuration information includes an RS resource and an RS sequence occupied by the first RS.
  • the M1 RS ports are the second signaling sending UEs in the M Among the RS ports, there are M1 RS ports with the best reception quality.
  • the reception quality includes one or two of ⁇ RSRP (Reference Signal Reception Power), RSRQ (Reference Signal Reception Quality).
  • the first signaling is a bitmap of M bits indicating whether the M RS ports are selected, respectively.
  • the M1 is configurable.
  • the method further includes the following steps:
  • Step C Sending backhaul signaling to the maintenance base station of the transmitting cell of the first RS, the backhaul signaling indicating M2 RS ports in the first RS
  • the M2 is a positive integer smaller than the M.
  • the base station notifies the interfering cell that the M2 RS ports generate severe interference, in order to assist the interfering cell to avoid using the precoding vector corresponding to the M2 RS ports when transmitting the downlink signal. How to determine the M2 RS ports is implementation dependent.
  • the transmitting base station of the first signaling and the maintaining base station are different base stations, and the backhaul signaling is transmitted through the X2 interface.
  • the transmitting base station of the first signaling and the maintaining base station are the same base station (that is, the transmitting cell of the first signaling and the transmitting cell of the first RS are maintained by the same base station), the backhaul signaling Transmitted inside the base station.
  • the M2 RS ports are the M1 RS ports.
  • the M1 RS ports are a subset of the M2 RS ports, and the M2 RS ports further include an RS port reported by a UE other than the transmitting UE of the second signaling.
  • the pattern of the RS port in the subframe reuses a pattern of the CSI-RS port in the subframe.
  • the RS port is sent by a P physical antenna configured by a transmitting cell of the first RS in a precoding manner, and the P is a positive integer greater than 1.
  • the M RS ports correspond to M orthogonal precoding vectors.
  • the P is a positive integer greater than 8.
  • the invention discloses a large-scale MIMO communication method in a base station, which comprises the following steps:
  • the first RS includes M RS ports
  • Step B Receive backhaul signaling, the backhaul signaling indicating M2 RS ports in the first RS
  • M is a positive integer greater than 1, and the M2 is a positive integer less than the M.
  • the method further includes the following steps:
  • Step C Determining a precoding matrix based on the backhaul signaling
  • Step D The precoding matrix is used in a given resource to transmit the downlink signal in a precoded manner.
  • the base station reduces interference to neighboring cells by selecting an appropriate precoding matrix.
  • the base station determines the precoding matrix according to at least one of ⁇ CSI, SRS ⁇ fed back by the target UE, and the backhaul signaling, where the CSI includes ⁇ PTI, RI, One or more of PMI, CQI ⁇ .
  • the precoding matrix and the precoding vectors corresponding to the M2 RS ports are orthogonal.
  • the given resource includes one or both of ⁇ time domain, frequency domain ⁇ .
  • the given resource is determined by the base station itself.
  • the given resource is indicated by the backhaul signaling.
  • the pattern of the RS port in the subframe reuses a pattern of the CSI-RS port in the subframe.
  • the RS port is sent by a P physical antenna configured by a transmitting cell of the first RS in a precoding manner, and the P is a positive integer greater than 1.
  • the invention discloses a large-scale MIMO communication method in a UE, which comprises the following steps:
  • Step A Receive first signaling, the first signaling indicating configuration information of the first RS, and the first RS includes M RS ports
  • Step C Sending second signaling, the second signaling indicating M1 RS ports in the first RS
  • the M is a positive integer greater than 1, and the M1 is a positive integer less than or equal to the M.
  • the transmitting cell of the first RS is a cell other than the transmitting cell of the first signaling.
  • the M1 RS ports are M1 RS ports of the second signaling sending UE having the best receiving quality among the M RS ports.
  • the reception quality includes one or two of ⁇ RSRP, RSRQ ⁇ .
  • the pattern of the RS port in the subframe reuses a pattern of the CSI-RS port in the subframe.
  • the RS port is sent by a P physical antenna configured by a transmitting cell of the first RS in a precoding manner, and the P is a positive integer greater than 1.
  • the present invention discloses a base station device, where the base station device includes:
  • a first module configured to send first signaling, where the first signaling indicates configuration information of the first RS, where the first RS includes M RS ports
  • the second module is configured to receive the second signaling, where the second signaling indicates the M1 RS ports in the first RS
  • a third module a maintenance base station for transmitting a backhaul signaling to a transmitting cell of the first RS, where the backhaul signaling indicates an M2 RS ports in the first RS
  • the M is a positive integer greater than 1, and the M1 is a positive integer less than or equal to the M.
  • the transmitting cell of the first RS is a cell other than the transmitting cell of the first signaling, and the M2 is smaller than A positive integer of the M.
  • the pattern of the RS port in the subframe reuses a pattern of CSI-RS ports within the subframe.
  • the RS port is sent in a pre-coded manner by a P-physical antenna configured by a transmitting cell of the first RS, where P is a positive integer greater than one.
  • the present invention discloses a base station device, where the base station device includes:
  • the first module is configured to send the first RS, where the first RS includes M RS ports
  • a second module configured to receive backhaul signaling, where the backhaul signaling indicates M2 RS ports in the first RS
  • a third module configured to determine a precoding matrix according to the backhaul signaling
  • the fourth module is configured to send the downlink signal in a precoding manner by using the precoding matrix in a given resource.
  • M is a positive integer greater than 1, and the M2 is a positive integer less than the M.
  • the pattern of the RS port in the subframe reuses a pattern of CSI-RS ports within the subframe.
  • the RS port is sent in a pre-coded manner by a P-physical antenna configured by a transmitting cell of the first RS, where P is a positive integer greater than one.
  • the invention discloses a user equipment, and the user equipment comprises:
  • a first module configured to receive first signaling, where the first signaling indicates configuration information of the first RS, where the first RS includes M RS ports
  • the second module is configured to receive the first RS
  • the third module is configured to send the second signaling, where the second signaling indicates the M1 RS ports in the first RS
  • the M is a positive integer greater than 1, and the M1 is a positive integer less than or equal to the M.
  • the transmitting cell of the first RS is a cell other than the transmitting cell of the first signaling.
  • the pattern of the RS port in the subframe reuses a pattern of CSI-RS ports within the subframe.
  • the RS port is sent in a pre-coded manner by a P-physical antenna configured by a transmitting cell of the first RS, where P is a positive integer greater than one.
  • the UE measures and feeds back the RS port of the interfering cell, and then the serving cell notifies the interfering cell by using the backhaul signaling.
  • the interfering cell determines a precoding vector used in the precoding operation according to the RS port indicated by the backhaul signaling to minimize interference to neighboring cells.
  • the RS port is transmitted by a pre-coding manner by multiple antennas configured by the transmitting cell. The invention effectively reduces interference to adjacent cells in Massive MIMO transmission and solves the SRS pollution problem. At the same time, the invention is as compatible as possible with the existing LTE system and has good compatibility.
  • FIG. 1 is a schematic diagram showing a downlink RS pattern of an existing LTE system
  • FIG. 2 shows a flow chart of inter-cell interference cancellation in accordance with one embodiment of the present invention
  • FIG. 3 is a block diagram showing the structure of a processing device used in an interfered base station according to an embodiment of the present invention
  • FIG. 4 illustrates a processing device for use in an interference source base station in accordance with yet another embodiment of the present invention.
  • FIG. 5 shows a block diagram of a structure for a processing device in a UE, in accordance with one embodiment of the present invention.
  • Embodiment 1 is a flow chart of inter-cell interference cancellation, as shown in FIG.
  • the base station N1 UE U3 maintains the base station of the serving cell
  • the base station N2 is the maintenance base station of the serving cell of the UE U4.
  • step S11 the first signaling is transmitted, in step S12, the second signaling is received; in step S13, the backhaul signaling is transmitted to the base station N2.
  • step S21 the first RS is transmitted, in step S22, the backhaul signaling is received; in step S23, the precoding matrix is determined according to the backhaul signaling; in step S24, given The precoding matrix is used in the resource to transmit the downlink signal in a precoding manner.
  • step S31 the first signaling is received; in step S32, the first RS is received; in step S33, the second signaling is transmitted.
  • the first signaling indicates configuration information of the first RS
  • the first RS includes M RS ports
  • the second signaling indicates M1 RS ports in the first RS
  • the back signaling indicates the first M2 RS ports in the RS
  • the M is a positive integer greater than 1
  • the M1 is a positive integer less than or equal to the M
  • the M2 is a positive integer smaller than the M.
  • the M1 RS ports are M1 RS ports of the second signaling transmitting UE having the best reception quality among the M RS ports.
  • the pattern of the RS port in the subframe reuses the pattern of the CSI-RS port in the subframe.
  • the RS port is transmitted in a pre-coded manner by a P-physical antenna configured by a transmitting cell of the first RS, and the P is a positive integer greater than 1.
  • the first signaling is RRC layer signaling
  • the second signaling is RRC.
  • the backhaul signaling is X2 interface signaling.
  • the M2 RS ports include the M1 RS ports and the interfering RS ports in the first RS reported by other UEs (the serving cell is maintained by the base station N1) received by the base station N1.
  • the backhaul signaling specifies the given resource, and the given resource is a frequency domain resource.
  • the M1 is configured by the base station N1 through downlink signaling.
  • Embodiment 2 is a structural block diagram of a processing device used in an interfered base station, as shown in FIG.
  • the first processing device 300 is mainly composed of a first sending module 301, a first receiving module 302, and a second sending module 303.
  • the first sending module 301 is configured to send the first signaling, where the first signaling indicates configuration information of the first RS, the first RS includes M RS ports, and the first receiving module 302 is configured to receive the second signaling, the second signaling
  • the command indicates the M1 RS ports in the first RS;
  • the second sending module 303 is configured to send the backhaul signaling to the maintenance base station of the sending cell of the first RS, where the backhaul signaling indicates the M2 in the first RS.
  • the M is a positive integer greater than 1
  • the M1 is a positive integer smaller than or equal to the M
  • the transmitting cell of the first RS is a cell other than the transmitting cell of the first signaling
  • M2 is a positive integer smaller than the M.
  • the RS port is transmitted in a pre-coded manner by a P-physical antenna configured by a transmitting cell of the first RS, and the P is a positive integer greater than 8.
  • the M1 RS ports are M1 RS ports of the second signaling transmitting UE having the best receiving quality among the M RS ports, and the receiving quality includes ⁇ RSRP , one or two of RSRQ ⁇ .
  • the pattern of the RS port in the subframe reuses a pattern of the CSI-RS port in the subframe
  • the configuration information includes a CSI-RS-Config IE (Information Element) Some or all of the information in it.
  • Embodiment 3 is a structural block diagram of a processing device in an interference source base station, as shown in FIG.
  • the second processing device 400 is mainly composed of a third sending module 401, a second receiving module 402, a determining module 403, and a fourth sending module 404, wherein the determining module 403 and the fourth sending Module 404 is an optional module.
  • the third sending module 401 is configured to send the first RS, where the first RS includes M RS ports, and the second receiving module 402 is configured to receive the backhaul signaling, where the backhaul signaling indicates the M2 RS ports in the first RS.
  • the determining module 403 is configured to determine a precoding matrix according to the backhaul signaling, and the fourth sending module 404 is configured to use the precoding matrix to transmit a downlink signal in a precoding manner in a given resource.
  • the M is a positive integer greater than 1, and the M2 is a positive integer smaller than the M.
  • the RS port is sent by a P-physical antenna configured by the transmitting cell of the first RS in a pre-coding manner, the pre-coding matrix includes a positive integer precoding vector, and the pre-coding corresponding to the M2 RS ports (
  • the column) vectors are v 1 , v 2 , . . . , v M2 , respectively, and the precoding matrix and v 1 , v 2 , . . . , v M2 are orthogonal.
  • the P is a positive integer greater than 8.
  • the backhaul signaling is transmitted through the X2 interface.
  • Embodiment 4 is a structural block diagram of a processing device in a UE, as shown in FIG.
  • the third processing device 500 is mainly composed of a third receiving module 501, a fourth receiving module 502, and a fifth transmitting module 503.
  • the third receiving module 501 is configured to receive the first signaling, where the first signaling indicates configuration information of the first RS, the first RS includes M RS ports, the fourth receiving module 502 is configured to receive the first RS, and the fifth sending module 503 is configured to send second signaling, where the second signaling indicates M1 RS ports in the first RS.
  • the M is a positive integer greater than 1
  • the M1 is a positive integer smaller than or equal to the M
  • the transmitting cell of the first RS is a cell other than the transmitting cell of the first signaling.
  • the M1 RS ports are M1 RS ports of the second signaling sending UE having the best receiving quality among the M RS ports.
  • the RS port is sent in a pre-coded manner by a P-physical antenna configured by the transmitting cell of the first RS, where P is a positive integer greater than one.
  • the M1 is configurable.

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Abstract

本发明提出了一种基站、UE中的大尺度MIMO通信方法和设备。在一个实施例中，基站首先发送第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口。然后接收第二信令，第二信令指示第一RS中的M1个RS端口。其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。本发明有效的降低了Massive MIMO传输中对相邻小区的干扰，解决了SRS污染问题。同时本发明尽可能的兼容现有的LTE系统，具有良好的兼容性。

Description

一种基站、UE中的大尺度MIMO通信方法和设备 技术领域
本发明涉及移动通信技术领域中信道状态测量以及反馈的方案，特别是涉及采用了Massive MIMO(Massive Multiple Input Multiple Output，大规模多输入输出)技术的移动通信系统中的下行信道状态测量以及反馈方案。
背景技术
传统的3GPP(3rd Generation Partner Project，第三代合作伙伴项目)LTE(Long Term Evolution，长期演进)系统中，下行MIMO信道的CSI(Channel Status Indicator，信道状态指示)反馈主要有两种方式
●反馈隐式CSI
UE(User Equipment，用户设备)通过检测CRS(Cell specific Reference Signal，小区特定的参考信号)或者是CSI-RS(CSI Reference Signal，信道状态指示参考信号)得到CIR(Channel Impulse Response，信道冲激响应)并映射为隐式CSI，所述隐式CSI包括PTI(Precoding Type Indicator，预编码类型指示)，RI(Rank Indicator，秩指示)，CQI(Channel Quality Indicator，信道质量指示)，PMI(Precoding Matrix Indicator，预编码矩阵指示)等信息。
附图1是一个现有LTE系统中基于Normal CP(Normal Cyclic Prefix，正常循环前缀)的CSI-RS图案-同时标示出了CRS和DMRS(Demodulation Reference Signal，解调参考信号)，其中一个小方格是LTE的最小资源单位-RE(Resource Element，资源粒子)。数字填充的RE是CSI-RS端口在子帧内的一种图案(数字表示端口索引)，交叉线标识的RE能用于发送DMRS，加粗线标识的RE能用于发送CRS。LTE系统采用端口的概念定义RS(Reference Signal，参考信号)资源：一个RS端口可能映射到一根物理天线，也有可能是多根物理天线通过合并叠加形成一根虚拟的天线。LTE定义了4种CSI-RS端口数量：1，2，4，8，附图1中标有数字的RE示例了一组8CSI-RS端口的图案示例， 数字表示端口索引。
●反馈SRS(Sounding Reference Signal，上行侦听参考信号)
UE发送上行SRS，系统侧通过解调SRS获得上行信道CSI，再根据链路对称性获得下行CSI。该方法主要适用于TDD(Time Duplex Division，时分双工)系统。
作为一种新的蜂窝网天线架构，Massive MIMO近来成为一个研究热点。Massive MIMO系统的典型特点是通过增加天线阵列单元的数量到较大的值从而获得一系列增益，例如，系统容量理论上随着天线数量的增加而持续增加；发射天线信号的相干叠加降低发射功率等等。当服务小区采用的预编码向量和所述服务小区的相邻小区的UE(User Equipment，用户设备)之间的信道平行(或者接近平行)时，Massive MIMO所面临的一个挑战是：下行预编码操作可能会给邻近小区带来较大干扰。上述挑战在SRS污染(Contamination)时尤其严重。列向量v1，v2是平行的，即(v1)H·v2/|v1||v2|＝1，其中xH，|x|分别表示x的共轭转置和x的模。
针对上述问题，本发明提出了一种适用于Massive MIMO传输的小区间干扰消除方案。
发明内容
本发明公开了一种基站中的大尺度MIMO通信方法，其中,包括如下步骤：
-步骤A.发送第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
-步骤B.接收第二信令，第二信令指示第一RS中的M1个RS端口
其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。
作为一个实施例，第一信令是RRC(Radio Resource Control，无线资源管理)层信令。作为一个实施例，第二信令是RRC层信令。
作为一个实施例，所述配置信息包括第一RS占用的RS资源和RS序列(Sequence)。
作为一个实施例，所述M1个RS端口是第二信令的发送UE在所述M 个RS端口中具有最好接收质量的M1个RS端口。
作为所述接收质量的一个实施例，所述接收质量包括{RSRP(Reference Signal Reception Power，参考信号接收功率)，RSRQ(Reference Signal Reception Quality，参考信号接收质量)}中的一个或者两个。
作为一个实施例，第一信令是M个比特的比特图，所述M个比特分别指示所述M个RS端口是否被选择。
作为一个实施例，所述M1是可配置的。
具体的，根据本发明的一个方面，还包括如下步骤：
-步骤C.发送回传信令到所述第一RS的发送小区的维持基站，所述回传信令指示第一RS中的M2个RS端口
其中，所述M2是小于所述M的正整数。
所述基站通过步骤C通知干扰小区其所述M2个RS端口产生了严重干扰，以辅助所述干扰小区能够在下行信号发送时避免采用所述M2个RS端口对应的预编码向量。如何确定所述M2个RS端口是实现相关。
作为一个实施例，第一信令的发送基站和所述维持基站是不同的基站，所述回传信令通过X2接口传输。作为一个实施例，第一信令的发送基站和所述维持基站是相同的基站(即第一信令的发送小区和第一RS的发送小区由同一个基站维持)，所述回传信令在基站内部传输。
作为一个实施例，所述M2个RS端口是所述M1个RS端口。作为一个实施例，所述M1个RS端口是所述M2个RS端口的子集，所述M2个RS端口还包括第二信令的发送UE之外的UE上报的RS端口。
具体的，根据本发明的一个方面，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
具体的，根据本发明的一个方面，所述RS端口由所述第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
作为一个实施例，所述M个RS端口对应M个正交的预编码向量。作为一个实施例，所述P是大于8的正整数。
本发明公开了一种基站中的大尺度MIMO通信方法，其中,包括如下步骤：
-步骤A.发送第一RS，第一RS包括M个RS端口
-步骤B.接收回传信令，所述回传信令指示第一RS中的M2个RS端口
其中，所述M是大于1的正整数，所述M2是小于所述M的正整数。
具体的，根据本发明的一个方面，还包括如下步骤：
-步骤C.根据所述回传信令确定预编码矩阵
-步骤D.在给定资源中采用所述预编码矩阵以预编码的方式发送下行信号。
所述基站通过选择合适的所述预编码矩阵以降低对邻近小区的干扰。作为所述步骤C的一个实施例，所述基站根据目标UE反馈的{CSI，SRS}中的至少一个以及所述回传信令确定所述预编码矩阵，所述CSI包括{PTI，RI，PMI，CQI}中的一个或者多个。
作为所述步骤C的一个实施例，所述预编码矩阵和所述M2个RS端口对应的预编码向量都正交。矩阵T和列向量v是正交的即TH·v＝0。
所述给定资源包括{时域，频域}中的一种或者两种。作为一个实施例，所述给定资源由所述基站自行确定。作为又一个实施例，所述给定资源是由所述回传信令指示。
具体的，根据本发明的一个方面，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
具体的，根据本发明的一个方面，所述RS端口由第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
本发明公开了一种UE中的大尺度MIMO通信方法，其中,包括如下步骤：
-步骤A.接收第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
-步骤B.接收第一RS
-步骤C.发送第二信令，第二信令指示第一RS中的M1个RS端口
其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。
作为一个实施例，所述M1个RS端口是第二信令的发送UE在所述M个RS端口中具有最好接收质量的M1个RS端口。
作为一个实施例，所述接收质量包括{RSRP，RSRQ}中的一个或者两个。
具体的，根据本发明的一个方面，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
具体的，根据本发明的一个方面，所述RS端口由所述第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
本发明公开了一种基站设备，所述基站设备包括：
第一模块：用于发送第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
第二模块：用于接收第二信令，第二信令指示第一RS中的M1个RS端口
第三模块：用于发送回传信令到所述第一RS的发送小区的维持基站，所述回传信令指示第一RS中的M2个RS端口
其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区，所述M2是小于所述M的正整数。
作为一个实施例，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
作为一个实施例，所述RS端口由第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
本发明公开了一种基站设备，所述基站设备包括：
第一模块：用于发送第一RS，第一RS包括M个RS端口
第二模块：用于接收回传信令，所述回传信令指示第一RS中的M2个RS端口
第三模块：用于根据所述回传信令确定预编码矩阵
第四模块：用于在给定资源中采用所述预编码矩阵以预编码的方式发送下行信号。
其中，所述M是大于1的正整数，所述M2是小于所述M的正整数。
作为一个实施例，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
作为一个实施例，所述RS端口由第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
本发明公开了一种用户设备，所述用户设备包括：
第一模块：用于接收第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
第二模块：用于接收第一RS
第三模块：用于发送第二信令，第二信令指示第一RS中的M1个RS端口
其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。
作为一个实施例，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
作为一个实施例，所述RS端口由第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
针对Massive MIMO系统中下行预编码操作可能会给邻近小区带来较大干扰这一问题，UE测量并反馈干扰小区的RS端口，再由其服务小区通过回传信令通知干扰小区。干扰小区根据所述回传信令指示的RS端口确定预编码操作时采用的预编码向量以尽可能减少对相邻小区的干扰。所述RS端口由发送小区配置的多天线采用预编码方式发送。本发明有效的降低了Massive MIMO传输中对相邻小区的干扰，解决了SRS污染问题。同时本发明尽可能的兼容现有的LTE系统，具有良好的兼容性。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更加明显：
图1示出了现有LTE系统的下行RS图案的示意图；
图2示出了根据本发明的一个实施例的小区间干扰消除的流程图；
图3示出了根据本发明的一个实施例的用于被干扰基站中的处理装置的结构框图；
图4示出了根据本发明的又一个实施例的用于干扰源基站中的处理装 置的结构框图；
图5示出了根据本发明的一个实施例的用于UE中的处理装置的结构框图。
具体实施方式
下文将结合附图对本发明的技术方案作进一步详细说明，需要说明的是，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
实施例1
实施例1是小区间干扰消除的流程图，如附图2所示。附图2中，基站N1UE U3的服务小区的维持基站，基站N2是UE U4的服务小区的维持基站。
对于基站N1，在步骤S11中，发送第一信令，在步骤S12中，接收第二信令；在步骤S13中，发送回传信令到基站N2。
对于基站N2，在步骤S21中，发送第一RS，在步骤S22中，接收回传信令；在步骤S23中，根据所述回传信令确定预编码矩阵；在步骤S24中，在给定资源中采用所述预编码矩阵以预编码的方式发送下行信号。
对于UE U3，在步骤S31中，接收第一信令；在步骤S32中，接收第一RS；在步骤S33中，发送第二信令。
实施例1中，第一信令指示第一RS的配置信息，第一RS包括M个RS端口，第二信令指示第一RS中的M1个RS端口，所述回传信令指示第一RS中的M2个RS端口，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，所述M2是小于所述M的正整数。
作为实施例1的子实施例1，所述M1个RS端口是第二信令的发送UE在所述M个RS端口中具有最好接收质量的M1个RS端口。
作为实施例1的子实施例2，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
作为实施例1的子实施例3，所述RS端口由所述第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
作为实施例1的子实施例4，第一信令是RRC层信令，第二信令是RRC 层信令，所述回传信令是X2接口信令。
作为实施例1的子实施例5，所述M2个RS端口包括所述M1个RS端口以及基站N1接收到的其他UE(服务小区由基站N1维持)上报的第一RS中的干扰RS端口。
作为实施例1的子实施例6，所述回传信令指定所述给定资源，所述给定资源是频域资源。
作为实施例1的子实施例7，所述M1是由基站N1通过下行信令配置的。
实施例2
实施例2是用于被干扰基站中的处理装置的结构框图，如附图3所示。附图3中，第一处理装置300主要由第一发送模块301、第一接收模块302和第二发送模块303组成。
第一发送模块301用于发送第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口；第一接收模块302用于接收第二信令，第二信令指示第一RS中的M1个RS端口；第二发送模块303用于发送回传信令到所述第一RS的发送小区的维持基站，所述回传信令指示第一RS中的M2个RS端口
实施例2中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区，所述M2是小于所述M的正整数。所述RS端口由第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于8的正整数。
作为实施例2的子实施例1，所述M1个RS端口是第二信令的发送UE在所述M个RS端口中具有最好接收质量的M1个RS端口，所述接收质量包括{RSRP，RSRQ}中的一种或者两种。
作为实施例2的子实施例2，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案，所述配置信息包括CSI-RS-Config IE(Information Element，信息单元)中的部分或者全部信息。
实施例3
实施例3是干扰源基站中的处理装置的结构框图，如附图4所示。附图4中，第二处理装置400主要由第三发送模块401、第二接收模块402、确定模块403和第四发送模块404组成，其中确定模块403和第四发送 模块404是可选模块。
第三发送模块401用于发送第一RS，第一RS包括M个RS端口；第二接收模块402用于接收回传信令，所述回传信令指示第一RS中的M2个RS端口；确定模块403用于根据所述回传信令确定预编码矩阵；第四发送模块404用于在给定资源中采用所述预编码矩阵以预编码的方式发送下行信号。
实施例3中，所述M是大于1的正整数，所述M2是小于所述M的正整数。所述RS端口由所述第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述预编码矩阵包括正整数个预编码向量，所述M2个RS端口对应的预编码(列)向量分别是v1，v2，...，vM2，所述预编码矩阵和v1，v2，...，vM2均正交。所述P是大于8的正整数。所述回传信令通过X2接口传输。
实施例4
实施例4是UE中的处理装置的结构框图，如附图5所示。附图5中，第三处理装置500主要由第三接收模块501、第四接收模块502和第五发送模块503组成。
第三接收模块501用于接收第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口；第四接收模块502用于接收第一RS；第五发送模块503用于发送第二信令，第二信令指示第一RS中的M1个RS端口
实施例4中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。所述M1个RS端口是第二信令的发送UE在所述M个RS端口中具有最好接收质量的M1个RS端口。所述RS端口由所述第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
作为实施例4的一个子实施例，所述M1是可配置的。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可以通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器，硬盘或者光盘等。可选的，上述实施例的全部或部分步骤也可以使用一个或者多个集成电路来实现。相应的，上述实施例中的各模块单元，可以采用硬件形式实现，也可以由软件功能模块的 形式实现，本申请不限于任何特定形式的软件和硬件的结合。
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，所做的任何修改，等同替换，改进等，均应包含在本发明的保护范围之内。

Claims (16)

  1. 一种基站中的大尺度MIMO通信方法，其中,包括如下步骤：
    -步骤A.发送第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
    -步骤B.接收第二信令，第二信令指示第一RS中的M1个RS端口
    其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。
  2. 根据权利要求1所述的基站中的大尺度MIMO通信方法，其特征在于，还包括如下步骤：
    -步骤C.发送回传信令到所述第一RS的发送小区的维持基站，所述回传信令指示第一RS中的M2个RS端口
    其中，所述M2是小于所述M的正整数。
  3. 根据权利要求1所述的基站中的大尺度MIMO通信方法，其特征在于，所述M1个RS端口是第二信令的发送UE在所述M个RS端口中具有最好接收质量的M1个RS端口。
  4. 根据权利要求1-3中任一项所述的基站中的大尺度MIMO通信方法，其特征在于，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
  5. 根据权利要求1-3中任一项所述的基站中的大尺度MIMO通信方法，其特征在于，所述RS端口由所述第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
  6. 一种基站中的大尺度MIMO通信方法，其中,包括如下步骤：
    -步骤A.发送第一RS，第一RS包括M个RS端口
    -步骤B.接收回传信令，所述回传信令指示第一RS中的M2个RS端口
    其中，所述M是大于1的正整数，所述M2是小于所述M的正整数。
  7. 根据权利要求6所述的基站中的大尺度MIMO通信方法，其特征在于，还包括如下步骤：
    -步骤C.根据所述回传信令确定预编码矩阵
    -步骤D.在给定资源中采用所述预编码矩阵以预编码的方式发送下行信号。
  8. 根据权利要求6或7所述的基站中的大尺度MIMO通信方法，其 特征在于，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
  9. 根据权利要求6或7所述的基站中的大尺度MIMO通信方法，其特征在于，所述RS端口由第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
  10. 一种UE中的大尺度MIMO通信方法，其中,包括如下步骤：
    -步骤A.接收第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
    -步骤B.接收第一RS
    -步骤C.发送第二信令，第二信令指示第一RS中的M1个RS端口
    其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。
  11. 根据权利要求10所述的UE中的大尺度MIMO通信方法，其特征在于，所述M1个RS端口是第二信令的发送UE在所述M个RS端口中具有最好接收质量的M1个RS端口。
  12. 根据权利要求10或11所述的UE中的大尺度MIMO通信方法，其特征在于，所述RS端口在子帧内的图案重用CSI-RS端口在子帧内的图案。
  13. 根据权利要求10或11所述的UE中的大尺度MIMO通信方法，其特征在于，所述RS端口由所述第一RS的发送小区配置的P根物理天线以预编码的方式发送，所述P是大于1的正整数。
  14. 一种基站设备，其特征在于，所述基站设备包括：
    第一模块：用于发送第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
    第二模块：用于接收第二信令，第二信令指示第一RS中的M1个RS端口
    第三模块：用于发送回传信令到所述第一RS的发送小区的维持基站，所述回传信令指示第一RS中的M2个RS端口
    其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区，所述M2是小于所述M的正整数。
  15. 一种基站设备，其特征在于，所述基站设备包括：
    第一模块：用于发送第一RS，第一RS包括M个RS端口
    第二模块：用于接收回传信令，所述回传信令指示第一RS中的M2个RS端口
    第三模块：用于根据所述回传信令确定预编码矩阵
    第四模块：用于在给定资源中采用所述预编码矩阵以预编码的方式发送下行信号；
    其中，所述M是大于1的正整数，所述M2是小于所述M的正整数。
  16. 一种用户设备，其特征在于，所述用户设备包括：
    第一模块：用于接收第一信令，第一信令指示第一RS的配置信息，第一RS包括M个RS端口
    第二模块：用于接收第一RS
    第三模块：用于发送第二信令，第二信令指示第一RS中的M1个RS端口
    其中，所述M是大于1的正整数，所述M1是小于或者等于所述M的正整数，第一RS的发送小区是第一信令的发送小区之外的小区。
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