WO2012079407A1 - 用于分布式天线系统的通信方法、装置和系统 - Google Patents

用于分布式天线系统的通信方法、装置和系统 Download PDF

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Publication number
WO2012079407A1
WO2012079407A1 PCT/CN2011/080366 CN2011080366W WO2012079407A1 WO 2012079407 A1 WO2012079407 A1 WO 2012079407A1 CN 2011080366 W CN2011080366 W CN 2011080366W WO 2012079407 A1 WO2012079407 A1 WO 2012079407A1
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WIPO (PCT)
Prior art keywords
antenna
cluster
receiving device
channel information
measurement reference
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Ceased
Application number
PCT/CN2011/080366
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English (en)
French (fr)
Inventor
张佳胤
倪俊
王艺
马霓
卢建民
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP11849671.0A priority Critical patent/EP2642670A4/en
Publication of WO2012079407A1 publication Critical patent/WO2012079407A1/zh
Priority to US13/914,899 priority patent/US20130273854A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • 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
    • H04B7/06—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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a communication method, apparatus, and system for a distributed antenna system. Background technique
  • a distributed antenna system is a network system composed of multiple antenna units (AU, Antenna Unit) for providing wireless coverage.
  • Each AU is composed of one or more antennas, and each AU is placed at a certain interval, and a signal is transmitted between the transmitting end and the receiving end through the AU.
  • the existing DAS is usually implemented by a Single Frequency Network (SFN), hereinafter referred to as DAS SFN, that is, the same signal is transmitted on each AU, and the receiving end of the user equipment (UE, User Equipment) receives the signal. It is not necessary to distinguish which AU the signal comes from, and the signals from each AU can be regarded as multipath components arriving at different delays.
  • SFN Single Frequency Network
  • UE User Equipment
  • the AU in the DAS is generally located in a non-central area such as a cell edge, so that in the case of the same power, the signal attenuation of the DAS SFN at the cell edge is small, resulting in interference to neighboring cells. Big.
  • the same signal is transmitted on each AU, but if one UE is very close to an AU, the quality of service of the UE can be guaranteed without other AUs. In other words, at this time, other signals can be transmitted on other AUs, so the multiplexing gain of the DAS SFN is low, resulting in a decrease in system capacity.
  • Embodiments of the present invention provide a communication method, apparatus, and system for a DAS, which can effectively improve the performance of the system.
  • a communication method for DAS comprising:
  • each of the antenna clusters includes at least one antenna, and each of the antenna clusters Has a cluster identifier corresponding thereto;
  • a communication method for DAS comprising:
  • each antenna cluster includes at least one antenna, and each of the antennas
  • the antenna cluster has a cluster identifier corresponding thereto;
  • a receiving device for a DAS comprising:
  • a receiving unit configured to receive a measurement reference signal corresponding to each antenna cluster in the cell, where all antennas in the cell are divided into at least one antenna cluster, each of the antenna clusters includes at least one antenna, and each of the antennas
  • the antenna cluster has a cluster identifier corresponding thereto;
  • a measuring unit configured to obtain, according to the measurement reference signal, a channel corresponding to each of the antenna clusters Information
  • a central processing device for DAS comprising:
  • a sending unit configured to send, to the receiving device in the cell, a measurement reference signal corresponding to each antenna cluster, where all antennas in the cell are divided into at least one antenna cluster, and each of the antenna clusters includes at least one antenna. And each of the antenna clusters has a cluster identifier corresponding thereto;
  • a receiving unit configured to receive, by the receiving device, a cluster identifier of the antenna cluster and corresponding channel information
  • a DAS that includes:
  • each of the antenna clusters includes at least one antenna, and each of the antenna clusters has The cluster identifier corresponding to it;
  • the receiving device is configured to receive a measurement reference signal corresponding to each antenna cluster in the cell; obtain channel information corresponding to each antenna cluster according to the measurement reference signal; and feed back, to the central processing device, a specific cluster of the antenna cluster Identification and corresponding channel information;
  • the central processing device is configured to send, to the receiving device in the cell, a measurement reference signal corresponding to each antenna cluster; and receive, by the receiving device, a cluster identifier of the antenna cluster and corresponding channel information; according to the antenna cluster
  • the cluster identifier and its corresponding channel information are determined as the antenna clusters served by the receiving device.
  • each antenna cluster belongs to the same cell, the receiving device does not need to perform high-level signaling interaction by switching between the antenna clusters, thereby reducing the number of handovers and thus reducing the handover delay. Therefore, the communication method, the receiving device, the central processing device, and the DAS for the DAS provided by the embodiments of the present invention can effectively improve the performance of the entire system.
  • FIG. 1 is a flowchart of a communication method for a DAS according to an embodiment of the present invention
  • FIG. 2 is an antenna clustering method for a DAS communication method according to an embodiment of the present invention
  • FIG. 3 is an antenna clustering method for a DAS communication method according to an embodiment of the present invention
  • FIG. 5 is an antenna clustering method for the DAS communication method according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a communication method for a DAS according to an embodiment of the present invention
  • Antenna clustering mode
  • Figure ⁇ is another flow chart of a communication method for DAS according to an embodiment of the present invention
  • FIG. 8 is a structural block diagram of a receiving device for a DAS according to an embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a receiving device for a DAS according to an embodiment of the present invention
  • FIG. 10 is a structural block diagram of a central processing device for a DAS according to an embodiment of the present invention.
  • FIG. 11 is another structural block diagram of a central processing device for a DAS according to an embodiment of the present invention.
  • FIG. 12 is a structural block diagram of a DAS according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of a distributed architecture of a DAS according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of a centralized architecture of a DAS according to an embodiment of the present invention.
  • a communication method for a DAS provided by an embodiment of the present invention, includes the following steps.
  • Step 101 The receiving device receives a measurement reference signal corresponding to each antenna cluster in the cell, where all antennas in the cell are divided into at least one antenna cluster, and each of the antenna clusters includes at least one antenna, and each of the antennas
  • the antenna cluster has a cluster identifier corresponding thereto.
  • all antennas in one cell are divided into at least one antenna cluster, that is, the sum of the number of antennas in all antenna clusters is equal to the number of antennas in the cell, and only one antenna cluster in one cell
  • Antenna clustering allows a limited number of measurement reference signal resources to support more antennas.
  • the antenna unit for performing clustering may be one antenna, or may be a plurality of antennas logically regarded as one antenna, or may be an AU including at least one antenna.
  • FIG. 2 to FIG. 5 illustrate antenna clustering modes adopted by the communication methods of the embodiments of the present invention.
  • antennas are placed at four sites in the cell A, each site is an antenna cluster, and 1, 2, 3, and 4 are used as cluster identifiers of the antenna clusters, and the antenna clusters 1 and 2 And 3 are placed at the edge of the cell and are three relatively far apart from each other, and the antenna cluster 4 is placed at the center of the cell.
  • antenna clusters are placed at two sites in the cell A, and clusters of 1, 2, 3, and 4 are also used as antenna clusters. Identification, each site is divided into two antenna clusters.
  • the distribution of the receiving device, such as the UE or the relay station, in the cell A is limited to the gray straight line region in the figure, the antenna is deployed along the straight region, and eight antennas are placed in the cell A. , divided into four antenna clusters, with 1, 2, 3, 4 as the cluster identification of the antenna cluster, each antenna cluster includes two antennas of antenna 1 and antenna 2, such antenna deployment and clustering mode can ensure even UE Or the relay can ensure smooth switching speed when running at higher speeds.
  • the antenna clustering mode shown in FIG. 5 there are two AUs in the cell A, and each AU includes two antennas, an antenna 1 and an antenna 2, and each AU serves as one antenna cluster.
  • FIG. 2 to FIG. 5 are only exemplary illustrations of the antenna clustering manner in the communication method according to the embodiment of the present invention.
  • the present invention does not limit this.
  • the cell may be determined according to actual performance requirements of the system.
  • the antenna clustering method. Specifically, the division criterion of the antenna cluster may follow: After the clustering, each antenna in the antenna cluster experiences different large-scale fading channels as much as possible. For example, the antennas in the cluster are geographically separated as far as possible.
  • the invention is not limited to the above criteria.
  • the measurement reference signal and the data sent to the receiving device are simultaneously transmitted and received, and the receiving device can extract the measurement reference signal from the received information to perform the following operations.
  • this step may include:
  • the receiving device receives the measurement reference signal corresponding to each antenna cluster in the cell, where the measurement reference signal is in one-to-one correspondence with each of the antenna clusters;
  • the measurement reference signal received by the receiving device is corresponding to each antenna cluster, that is, the measurement reference signal is unique to each antenna cluster, and the measurement reference signals corresponding to the antenna clusters in the small area are different.
  • the receiving device can distinguish the antenna clusters by using the measurement reference signal, that is, the receiving device can determine the cluster identifier of the antenna cluster according to the measurement reference signal of each of the antenna clusters.
  • the measurement reference signal corresponding to each antenna cluster is a signal that is orthogonal or non-orthogonal between the antenna clusters.
  • the measurement reference signals When the measurement reference signals are orthogonal to each other, they may be any reference signals on the antenna cluster that do not occupy the same frequency and time at the same time, or may use different orthogonal code words. Any reference signal. When the measurement reference signal is non-orthogonal, the same reference signal may be scrambled on each antenna cluster by using different non-orthogonal scrambling codes as a measurement reference signal of each antenna cluster, that is, non-orthogonal between the antenna clusters but differently applied Scrambled signal. Of course, other signals can also be used as measurement reference signals, which are not limited in the present invention.
  • Step 102 Obtain channel information corresponding to each antenna cluster according to the measurement reference signal.
  • the receiving device measures the measurement reference signal of each antenna cluster, thereby obtaining channel information corresponding to each cluster.
  • the channel information includes a channel quality indicator CQI (Channel Quality Indicator), a channel correlation, a coefficient of the channel, and the like.
  • CQI Channel Quality Indicator
  • Step 103 Send, to the central processing device, the cluster identifier of the antenna cluster and its corresponding channel information, so that the central processing device determines to serve the receiving device according to the cluster identifier of the antenna cluster and its corresponding channel information.
  • the antenna cluster Send, to the central processing device, the cluster identifier of the antenna cluster and its corresponding channel information, so that the central processing device determines to serve the receiving device according to the cluster identifier of the antenna cluster and its corresponding channel information.
  • the central processing device can determine the antenna cluster served by the receiving device according to the cluster identifier of the antenna cluster and the corresponding channel information sent by the receiving device, where the antenna cluster determined by the central processing device is At least one of the generally determined antenna clusters is an optimal antenna cluster capable of serving the receiving device, for example, an antenna cluster located near the antenna of the receiving device, or an antenna cluster having the best channel quality, and the like
  • the determined antenna cluster serves the receiving device.
  • the antennas in other antenna clusters do not transmit signals or transmit other signals. Therefore, all antennas are not required to transmit the same signal, which effectively reduces interference to neighboring cells, and improves the system. Capacity.
  • the cluster identifier of the antenna cluster sent to the central processing device and the corresponding channel information may be the cluster identifier of all antenna clusters in the cell and corresponding channel information, or may be part of the antenna cluster in all antenna clusters in the cell.
  • the corresponding channel information for example, the pre-selection of the antenna cluster by the receiving device according to the obtained channel information, the cluster identifier of the selected antenna cluster and its corresponding channel information, specifically, after step 102, Before the step 103, the communication method in this embodiment further includes:
  • sending the cluster identifier of the antenna cluster and the corresponding channel information to the central processing device include:
  • the cluster identification of the preferably used antenna cluster and its corresponding channel information are transmitted to a central processing device.
  • the central processing device can determine the antenna cluster serving the receiving device according to the cluster identifier of the antenna cluster preferably used by the receiving device and its channel information.
  • the manner in which the receiving device sends the cluster identifier of the antenna cluster to the central processing device may be explicitly sent, or may be implicitly sent.
  • the transmission information of the receiving device directly includes the cluster identifier.
  • the sending information of the receiving device does not directly include the cluster identifier, and the cluster identifier is implicit in the information sent by the receiving device.
  • the correspondence between the antenna cluster and the measurement reference signal is preset between the central processing device and the receiving device, and the central processing device directly extracts the cluster identifier from the channel information sent by the receiving end according to the corresponding relationship, and There is no need to include the cluster identifier directly in the sent information. Specifically, as shown in FIG.
  • the frequency band occupied by the cell is divided, and the frequency band is divided into several sub-bands, and the sub-bands do not overlap each other, and the antenna cluster and the sub-band are bound, and each antenna is bound.
  • the cluster only sends data on its bound subbands.
  • the squares in Figure 6 represent different subbands, and the different subbands are bound to different antenna clusters, represented by different padding.
  • the measurement reference signal corresponding to each antenna cluster is a measurement reference signal transmitted by the sub-band corresponding to each antenna cluster, and the channel information corresponding to each antenna cluster is channel information of each sub-band; in this step, the receiving device is centered
  • the processing device sends the channel information of the sub-band, and the central processing device can determine the cluster identifier of the antenna cluster corresponding to the channel information according to the sub-band corresponding to the channel information.
  • the communication method for the DAS provided by the embodiment of the present invention can select an optimal antenna cluster for the receiving device to serve, and serve the receiving device by using the antenna in the selected antenna cluster, and at the same time, in the other antenna clusters of the cell
  • the antenna does not transmit signals or transmit other signals, thus effectively reducing interference to neighboring cells and increasing the system capacity of the DAS.
  • each antenna cluster belongs to the same cell, the receiving device does not need to perform high-level signaling interaction by switching between the antenna clusters, thereby reducing the number of handovers and thus reducing the handover delay. Therefore, it is possible to effectively reduce interference to neighboring cells, Increased system capacity of DAS. Therefore, the communication method for DAS provided by the embodiment of the present invention can effectively improve the performance of the entire system.
  • the embodiment of the present invention further provides a communication method for DAS, based on a central processing device that transmits downlink data, such as a base station or a central processing unit (CU), such as As shown in Figure 7, the following steps are included:
  • Step 201 The central processing device sends, to the receiving device in the cell, a measurement reference signal corresponding to each antenna cluster, where all antennas in the cell are divided into at least one antenna cluster, and each of the antenna clusters includes at least one antenna. And each of the antenna clusters has a cluster identifier corresponding thereto.
  • the receiving device can obtain channel information corresponding to each antenna cluster by measuring the measurement reference signal, and further, the receiving device can further determine, according to the channel information, an antenna cluster that the receiving device wishes to use, that is, the antenna cluster.
  • the antenna cluster that is preferably used by the receiving device.
  • the measurement reference signal sent by the central processing device is in one-to-one correspondence with each antenna cluster, that is, the measurement reference signal is unique to each antenna cluster, and the corresponding measurement of each antenna cluster in the small area
  • the reference signals are different, so that the receiving device can distinguish the antenna clusters by using the measurement reference signal, that is, the receiving device can determine the cluster identifier of the antenna cluster according to the measurement reference signal of each of the antenna clusters.
  • the measurement reference signals one-to-one corresponding to each antenna cluster are signals that are orthogonal or non-orthogonal between the antenna clusters.
  • the measurement reference signals When the measurement reference signals are orthogonal to each other, they may be any reference signals on the antenna cluster that do not occupy the same frequency and time at the same time, or may be any reference signals using different orthogonal code words.
  • the measurement reference signal When the measurement reference signal is non-orthogonal, the same reference signal may be scrambled on each antenna cluster by using different non-orthogonal scrambling codes as a measurement reference signal of each antenna cluster, that is, non-orthogonal between the antenna clusters but differently applied Scrambled signal.
  • other signals can also be used as measurement reference signals.
  • Step 202 Receive, by the receiving device, a cluster identifier of the antenna cluster and corresponding channel information.
  • the cluster identifier of the antenna cluster and its corresponding channel information may be all days in the cell.
  • the cluster identifier of the line cluster and its corresponding channel information may also be a cluster identifier of a part of the antenna clusters in all antenna clusters in the cell and corresponding channel information. Specifically, this step may include:
  • the receiving device And receiving, by the receiving device, a cluster identifier of the antenna cluster that is used by the receiving device, and corresponding channel information, where the receiving device preferably uses at least one antenna cluster.
  • the cluster identifier may be explicit, that is, the information directly includes the cluster identifier.
  • the cluster identifier can also be implicit, that is, the cluster identifier is not directly included in the information, and the cluster identifier is implicit in the information.
  • the correspondence between the antenna cluster and the measurement reference signal is preset between the central processing device and the receiving device, and the central processing device directly extracts the cluster identifier from the channel information sent by the receiving end according to the corresponding relationship. Without having to include the cluster identifier directly in the sent message.
  • the antenna cluster is bound to the sub-band. After binding, each antenna cluster transmits data only on its bound sub-band, and the sub-band and the antenna cluster are one by one.
  • this step specifically includes:
  • the central processing device only needs to receive the channel information sent by the receiving device, and can determine the cluster identifier of the antenna cluster corresponding to the channel information.
  • Step 203 Determine, according to the cluster identifier of the antenna cluster and its corresponding channel information, the antenna cluster served by the receiving device.
  • the central processing device can determine, according to the cluster identifier of the antenna cluster and its channel information, an antenna cluster serving the receiving device, which is usually an optimal antenna cluster capable of serving the receiving device, for example, close to the antenna cluster.
  • an antenna cluster serving the receiving device which is usually an optimal antenna cluster capable of serving the receiving device, for example, close to the antenna cluster.
  • Receiving an antenna cluster in which the antenna of the device is located, and serving the receiving device through the determined antenna cluster, and the antennas in other antenna clusters do not send signals or send other signals. Therefore, all antennas are not required to transmit the same signal, which effectively reduces interference to neighboring cells and increases the capacity of the system.
  • the communication method in this embodiment may further include:
  • the antennas in the determined antenna clusters serving the receiving device are determined to further reduce interference to adjacent cells and improve the system capacity of the DAS.
  • the central processing device may determine, by means of reciprocity of the uplink and downlink channels, an antenna and a transmission scheme serving the receiving device in the determined antenna cluster, and the data sent by each antenna in the antenna cluster may be the same. It may also be different. For example, each antenna in the antenna cluster adopts a transmission scheme such as spatial multiplexing or transmit diversity.
  • the communication method for the DAS provided by the embodiment of the present invention can select an optimal antenna cluster for the receiving device to serve, and use the selected antenna in the antenna cluster to serve the receiving device, and at the same time, in the other antenna clusters of the cell.
  • the antenna does not transmit signals or transmit other signals, thus effectively reducing interference to neighboring cells and increasing the system capacity of the DAS.
  • the receiving device since each antenna cluster belongs to the same cell, the receiving device does not need to perform high-level signaling interaction by switching between the antenna clusters, thereby reducing the number of handovers and thus reducing the handover delay. Therefore, the interference to adjacent cells can be effectively reduced, and the system capacity of the DAS is improved. Therefore, the communication method for the DAS provided by the embodiment of the present invention can effectively improve the performance of the entire system.
  • the LTE (Long Time Evolution) system is taken as an example to further describe the communication method for the DAS provided by the embodiment of the present invention.
  • each antenna cluster occupies 1 antenna port (called antenna port in LTE), and the antenna common pilot CRS (LTE-specific reference) in LTE version 8 is used on each antenna port.
  • Signal, cell reference signal as a reference signal for measurement
  • the orthogonal pilots in this way, the UE can distinguish and confirm the antenna cluster according to different antenna ports of the measurement reference signal.
  • This embodiment includes:
  • Step 301 The base station (Central Processing Device) sends an orthogonal pilot signal corresponding to each antenna cluster to a UE (receiving device) in the cell.
  • the base station Central Processing Device
  • Step 302 The UE receives orthogonal pilot signals corresponding to each antenna cluster.
  • Step 303 The UE obtains channel information corresponding to each antenna cluster according to the orthogonal pilot signals corresponding to the antenna clusters.
  • the channel information corresponding to each antenna cluster is CQI.
  • Step 304 The UE determines, according to channel information corresponding to each antenna cluster, an antenna cluster that is preferably used by the UE.
  • the UE preferably uses at least one antenna cluster.
  • Step 305 The UE sends the cluster identifier of the preferably used antenna cluster and its channel information to the base station. Specifically, if the UE selects only one antenna cluster at a time, in this embodiment, when one antenna cluster that is preferably used is selected from the four antenna clusters, the UE sends the pre-correspondence corresponding to the antenna cluster that is preferably used by the receiving device to the base station.
  • a coding matrix indicator PMI Precoding Matrix Indicator
  • channel information CQI corresponding to the antenna cluster
  • the base station can The cluster identity of the preferably used antenna cluster is obtained from the PMI and the precoding matrix.
  • the corresponding relationship between the PMI and the preset precoding matrix, that is, the antenna clustering codebook can be as shown in Table 1.
  • the UE may also send the antenna cluster corresponding to the preferred receiving antenna of the receiving device to the base station.
  • a precoding matrix indicator PMI Precoding Matrix Index
  • CQI channel information corresponding to the preferably used antenna cluster
  • the PMI corresponds to a preset precoding matrix, that is, an antenna clustering codebook
  • the base station receives the PMI.
  • the cluster identifier of the preferably used antenna cluster can be obtained according to the PMI and the precoding matrix.
  • the corresponding relationship between the PMI and the preset precoding matrix, that is, the antenna clustering codebook can be as shown in Table 2.
  • the CQI is a value that simultaneously characterizes the channel information of two antenna clusters.
  • the PMI value enables the base station to determine the antenna clusters preferably used by the UEs in the four antenna clusters, and further characterizes the channel information of the antenna clusters that are preferably used.
  • Step 306 The base station receives, by the UE, a cluster identifier of the antenna cluster that is used by the UE and its channel information.
  • Step 307 The base station determines, according to the received cluster identifier of the antenna cluster that the UE preferably uses and its channel information, an antenna cluster that is served by the UE.
  • the base station determines the antenna cluster served by the UE according to the CQI and the PMI sent by the UE.
  • the base station may use a channel sounding reference signal (Sounding Reference Signal) or a RACH channel (Randic Access Channel) that is sent when each antenna in the antenna cluster is uplinked.
  • Receive power select the antenna with the highest received power as the antenna serving the UE.
  • the AU is used as a clustering unit, and the antenna cluster is divided.
  • Each AU includes one or more antennas, and one antenna cluster may have one or more AUs, and the AUs included in each antenna cluster include antennas.
  • the number is the same; the frequency band occupied by the cell is divided, the frequency band is divided into several sub-bands, and the sub-bands do not overlap each other, and all frequency bands in the small area participate in the division, and a certain frequency band in the non-existent cell does not belong to any one of the divisions.
  • the total number of subbands after division is equal to the number of antenna clusters in the cell, and the antenna cluster is bound to the subband. After binding, each antenna cluster transmits data only on its bound subband, for example, FIG.
  • the antenna clustering method shown It should be noted that the size of the subband to which each antenna cluster is bound is not limited, and may be the same or different. Different antenna clusters use CSI-RS (Channel State Information Reference Signal) signals located on different sub-bands as measurement reference signals, that is, the measurement reference signals are CSI-RSs.
  • CSI-RS Channel State Information Reference Signal
  • Step 401 The base station (central processing device) sends a CSI-RS of each sub-band, that is, a CSI-RS corresponding to each antenna cluster, to a UE (receiving device) in the cell.
  • Step 402 The UE receives the CSI-RS corresponding to each subband.
  • Step 403 The UE obtains a CQI and a PMI (Precoding Matrix Indicator) of each subband according to the CSI-RS corresponding to each antenna cluster.
  • a CQI and a PMI Precoding Matrix Indicator
  • the CQI is the channel information of each subband.
  • Step 404 The UE sends the CQI and PMI of all subbands to the base station.
  • the UE may also determine, according to the CQI of each subband, a subband that is preferably used by the UE, where the UE preferably uses at least one subband, and sends the CQI and PMI of the preferably used subband to the base station.
  • the UE needs to send the CQI of all subbands when transmitting, and does not need to send the PMI of all subbands. If there are multiple antennas on the AU, the CQI and PMI of all subbands need to be sent when the UE transmits.
  • Step 406 The base station receives the CQI and PMI of all subbands sent by the UE.
  • Step 407 The base station performs resource scheduling according to the received CQI and PMI of all subbands, and determines a subband serving as the UE. Since one subband corresponds to only one antenna cluster, the process of selecting the subband is the process of selecting the antenna cluster served by the UE. Specifically, the base station selects an antenna cluster with the best channel quality and allocates it to the UE according to the channel quality of each subband. If there are multiple AUs in one antenna cluster, the base station may select according to the channel sounding reference signal (Sounding Reference Signal) or the RACH channel (Random Access Channel) received by each antenna in the AU. The AU with the highest received power is used as the AU serving the UE.
  • Sounding Reference Signal Sounding Reference Signal
  • RACH channel Random Access Channel
  • the binding of the antenna cluster to the subband may be static or dynamic.
  • the former can be specified after the antenna is deployed in the cell, and the latter can be adjusted by the base station according to requirements, such as changes in user load, etc., after a certain time.
  • the communication method of the present invention is not limited thereto, and can be applied to other types of wireless cellular systems, such as TD-SCDMA (Time Division-Synchronous Code Division Multiple Access). Multiple access), WCDMA (Wideband Code Division Multiple Access) system, and the like.
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access). Multiple access
  • WCDMA Wideband Code Division Multiple Access
  • the embodiment of the present invention further provides a receiving device 80 for the DAS. As shown in FIG. 8, the method includes:
  • the receiving unit 10 is configured to receive measurement reference signals corresponding to the antenna clusters in the cell, where all antennas in the cell are divided into at least one antenna cluster, and each of the antenna clusters includes at least one antenna, and each The antenna cluster has a cluster identifier corresponding thereto;
  • the measuring unit 11 is configured to obtain channel information corresponding to each of the antenna clusters according to the measurement reference signal;
  • the sending unit 12 is configured to send the cluster identifier of the antenna cluster and its corresponding channel information to the central processing device, so that the central processing device determines, according to the cluster identifier of the antenna cluster and its corresponding channel information, Receiving the antenna cluster served by the device.
  • the receiving device for the DAS provided by the embodiment of the present invention can select an antenna cluster served for the receiving device, and serve the receiving device by using the antenna cluster, which can effectively reduce the neighboring cell.
  • the interference increases the system capacity of the DAS.
  • the receiving device since each antenna cluster belongs to the same cell, the receiving device does not need to perform high-level signaling interaction by switching between the antenna clusters, thereby reducing the number of handovers and thus reducing the handover delay. Therefore, the receiving device for the DAS provided by the embodiment of the present invention can effectively improve the performance of the entire communication system.
  • the receiving unit 10 is specifically configured to receive a measurement reference signal corresponding to each antenna cluster, and determine a cluster identifier of the antenna cluster according to the measurement reference signal.
  • a measurement reference signal that is paired with each antenna cluster is a signal that is orthogonal to each other between the clusters of the antennas, or a signal that is non-orthogonal between the antenna clusters but that is applied with a different scrambling code.
  • the sending unit 12 may be specifically configured to send the cluster identifier of all the antenna clusters in the cell and the channel information thereof to the central processing device, or may be specifically used to send the cluster identifier of the partial antenna cluster in the cell to the central processing device. Its channel information.
  • the receiving device 90 of this embodiment may further include a determining unit 13 configured to determine, according to the channel information, an antenna cluster that is preferably used by the receiving device;
  • the sending unit 12 is specifically configured to send, to the central processing device, a precoding matrix indicator corresponding to the preferably used antenna cluster, the precoding matrix indicator and a preset precoding matrix.
  • the central processing device is capable of obtaining the cluster identifier of the preferably used antenna cluster according to the precoding indicator and the precoding matrix.
  • the cluster identifier sent by the sending unit 12 to the central processing device may be explicitly sent, that is, the cluster identifier is directly sent to the central processing device, or may be implicitly transmitted, by implicitly indicating the cluster identifier in the sending information.
  • the receiving unit 10 is specifically configured to receive a measurement reference signal that is sent by using a sub-band corresponding to each antenna cluster, where the antenna cluster is in one-to-one correspondence with the sub-band, and each The antenna unit transmits data only on its corresponding sub-band; the measuring unit 11 is specifically configured to determine channel information of each sub-band according to the measurement reference signal; and the sending unit 12 is specifically configured to send the information to the central processing device.
  • the channel information of the subband is specifically configured to receive a measurement reference signal that is sent by using a sub-band corresponding to each antenna cluster, where the antenna cluster is in one-to-one correspondence with the sub-band, and each The antenna unit transmits data only on its corresponding sub-band; the measuring unit 11 is specifically configured to determine channel information of each sub
  • the transmitting unit 12 Since the subbands are in one-to-one correspondence with the antenna clusters, at this time, the transmitting unit 12 is implicitly transmitted, and the central processing device can be based on the channel.
  • the subband corresponding to the information determines the cluster identifier of the antenna cluster transmitted by the receiving device.
  • the embodiment of the present invention further provides a receiving device 1000 for a DAS. As shown in FIG. 10, the method includes:
  • the sending unit 20 is configured to send, to the receiving device in the cell, a measurement reference signal corresponding to each antenna cluster, where all antennas in the cell are divided into at least one antenna cluster, and each of the antenna clusters includes at least one antenna And each of the antenna clusters has a cluster identifier corresponding thereto;
  • the receiving unit 21 is configured to receive, by the receiving device, a cluster identifier of the antenna cluster and channel information corresponding thereto;
  • the determining unit 22 is configured to determine, according to the cluster identifier of the antenna cluster and its corresponding channel information, the antenna cluster serving the receiving device.
  • the central processing device for the DAS provided by the embodiment of the present invention can select an antenna cluster for the receiving device to serve the receiving device, and can effectively reduce the interference to the neighboring cell by using the antenna cluster, thereby improving the DAS. System capacity. Moreover, since each antenna cluster belongs to the same cell, the receiving device does not need to perform high-level signaling interaction by switching between the antenna clusters, thereby reducing the number of handovers and thus reducing the handover delay. Therefore, the receiving device for the DAS provided by the embodiment of the present invention can effectively improve the performance of the entire communication system.
  • the sending unit 20 is specifically configured to send, to the receiving device in the cell, a measurement reference signal corresponding to each antenna cluster, where the measurement reference signal is in one-to-one correspondence with each antenna cluster, and the receiving device can be configured according to the measurement reference signal. And determining a cluster identifier of the antenna cluster corresponding to the measurement reference signal.
  • the measurement reference signals one-to-one corresponding to each antenna cluster are signals orthogonal to each other between clusters, or signals that are non-orthogonal between antenna clusters but with different scrambling codes applied thereto.
  • the receiving unit 21 is configured to receive, by the receiving device, a cluster identifier of all antenna clusters in the cell and corresponding channel information, or receive an antenna that is used by the receiving device and is used by the receiving device.
  • the receiving unit 21 Specifically, it is used to receive a precoding matrix indicator corresponding to an antenna cluster that is used by the receiving device, and the precoding matrix indicator corresponds to a preset precoding matrix.
  • the central processing device of this embodiment is capable of determining, according to the precoding matrix indicator and a preset precoding matrix, a cluster identifier corresponding to the preferably used antenna cluster of the receiving device.
  • the receiving unit 21 is specifically configured to receive a cluster identifier of all antenna clusters in the cell and corresponding channel information, or a cluster identifier of the antenna cluster that is preferably used by the receiving device, and corresponding channel information, where the receiving Preferably, the device uses at least one antenna cluster.
  • the receiving unit 21 is specifically configured to receive, by the receiving device, a precoding matrix indicator corresponding to the antenna cluster that is used by the receiving device, where the precoding matrix indicator is Corresponding to the preset precoding matrix, the central processing device of this embodiment can determine, according to the precoding matrix indicator and a preset precoding matrix, the antenna cluster corresponding to the preferred use of the receiving device. Cluster ID.
  • the cluster identifier may be explicit, that is, the information directly includes the cluster identifier.
  • the cluster identifier may also be implicit, that is, the cluster identifier is not directly included in the information, and the cluster identifier is implicit in the information.
  • the sending unit 20 is specifically configured to send, to the receiving device in the cell, a measurement reference signal that is sent by using a sub-band corresponding to each antenna cluster, where the antenna
  • the clusters are in one-to-one correspondence with the sub-bands, and each of the antenna clusters only transmits data on its corresponding sub-band;
  • the receiving unit 21 of the receiving device 1100 further includes:
  • the receiving module 210 is configured to receive channel information of the subband that is sent by the receiving device, where the determining module 211 is configured to determine, according to the subband corresponding to the channel information, a cluster identifier of an antenna cluster corresponding to the channel information.
  • the embodiment of the present invention further provides a DAS system 1200, as shown in FIG. 12, including:
  • each of the antenna clusters includes at least one antenna, and each of the antenna clusters has a cluster identifier corresponding thereto;
  • the receiving device 5 is configured to receive a measurement reference signal corresponding to each antenna cluster in the cell; obtain channel information corresponding to each antenna cluster according to the measurement reference signal; and determine, according to the channel information, an antenna cluster that is preferably used by the receiving device;
  • the processing device 7 sends the cluster identifier of the antenna cluster and its corresponding channel information;
  • the central processing device 7 is configured to send, to the receiving device 5, the measurement reference signal corresponding to each antenna cluster; the cluster identifier of the antenna cluster and the corresponding channel information sent by the receiving device 5; and the cluster identifier according to the antenna cluster and The corresponding channel information is determined as the antenna cluster served by the receiving device 5.
  • the DAS provided by the embodiment of the present invention can select an antenna cluster for the receiving device to serve the receiving device, and can effectively reduce the interference to the neighboring cell and improve the system capacity of the DAS. Moreover, since each antenna cluster belongs to the same cell, the receiving device does not need to perform high-level signaling interaction by switching between the antenna clusters, thereby reducing the number of handovers and thus reducing the handover delay. Therefore, the receiving device for the DAS provided by the embodiment of the present invention can effectively improve the performance of the entire communication system.
  • the receiving device 5 can use the receiving device provided by the embodiment of the present invention.
  • the central processing device 7 can use the central processing device provided by the embodiment of the present invention.
  • the DAS provided by the embodiment of the present invention may be a distributed architecture.
  • the central processing device 7 includes a CU 71 and a signal source 72, and each antenna 6 is connected to a corresponding independent signal source 72.
  • the CU 71 is connected to each of the signal sources 72.
  • Each of the signal sources 72 is responsible for converting the digital baseband signals from the CU into radio frequency signals, and converting the radio frequency signals received by the distributed antennas connected thereto into baseband signals and transmitting them to the CU.
  • the CU is responsible for distributing the digital baseband signals that need to be transmitted to different independent signal sources 72 in the downlink, and jointly processing the digital baseband signals from all connected signal sources 72 in the uplink.
  • the signal source 71 and the antenna 6 are located at the same site.
  • the dashed box in Figure 12 represents the same site.
  • the DAS provided by the embodiment of the present invention may also be a centralized architecture. Specifically, as shown in FIG. 14, the dotted line frame in FIG. 14 represents the same site, and the signal source 72 and the CU 71 may be located at the same site. The antennas 6 are at the same site.
  • the DAS of the embodiment of the present invention may also adopt other architectural manners, which are not limited by the present invention.

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Description

用于分布式天线系统的通信方法、 装置和系统 本申请要求了 2010年 12月 17日提交的、 申请号为 201010593602.4、 发 明名称为"用于分布式天线系统的通信方法、 装置和系统"的中国申请的优先 权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域， 尤其涉及一种用于分布式天线系统的通信方 法、 装置和系统。 背景技术
分布式天线系统（ DAS , Distributed Antenna System )是由多个天线单元 ( AU, Antenna Unit )组成的、 用于提供无线覆盖的网络系统。 其中， 每个 AU 由一根或多根天线组成， 各 AU之间相隔一定的间距放置， 发射端和接收端 之间通过 AU进行信号传输。
现有的 DAS通常采用单频网 （SFN, Single Frequency Network ) 的方式 实现，以下简称为 DAS SFN,即各 AU上发送完全相同的信号，用户设备（ UE, User Equipment )等接收端接收信号时无需区分信号来自哪个 AU, 可以将来 自各 AU 的信号视作不同时延到达的多径分量。 相对于将天线或基站位于小 区中央的传统集中式天线系统（CAS, Centralized Antenna System ) 来讲， 现 有的 DAS能够使小区的吞吐量和容量得到提升， 而且可以获得较高的空间复 用增益。
但是，现有的 DAS SFN, DAS中的 AU—般位于小区边缘等非中心区域， 这样在功率相同的情况下， DAS SFN在小区边缘的信号衰减就较小， 导致对 相邻小区的干扰较大。 而且， DAS SFN中， 各 AU上发送完全相同的信号， 但如果一个 UE非常靠近某个 AU, 则无需其它 AU即可保证为该 UE的服务 质量。 换言之， 此时其它 AU上原本可以发送其它信号， 所以 DAS SFN的复 用增益低， 导致系统容量下降。 发明内容
本发明的实施例提供一种用于 DAS的通信方法、 装置和系统， 能够有效 提升系统的性能。
本发明的实施例采用如下技术方案：
一种用于 DAS的通信方法， 包括：
接收设备接收小区内各天线簇对应的测量参考信号， 其中， 所述小区内 的所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根天线， 且每个所述天线簇具有与其对应的簇标识；
根据所述测量参考信号， 获得各所述天线簇对应的信道信息；
向中央处理设备发送所述天线簇的簇标识及其对应的信道信息， 以使所 述中央处理设备根据所述天线簇的簇标识及其对应的信道信息确定为所述接 收设备服务的所述天线簇。 一种用于 DAS的通信方法， 包括：
向小区内的接收设备发送各天线簇对应的测量参考信号， 其中， 所述小 区内的所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根天 线， 且每个所述天线簇具有与其对应的簇标识；
接收所述接收设备发送的、 所述天线簇的簇标识及其对应的信道信息； 根据所述天线簇的簇标识及其对应的信道信息， 确定为所述接收设备服 务的所述天线簇。 一种用于 DAS的接收设备， 包括：
接收单元， 用于接收小区内各天线簇对应的测量参考信号， 其中， 所述 小区内的所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根 天线， 且每个所述天线簇具有与其对应的簇标识；
测量单元， 用于根据所述测量参考信号， 获得各所述天线簇对应的信道 信息；
发送单元， 用于向中央处理设备发送所述天线簇的簇标识及其对应的信 道信息， 以使所述中央处理设备根据所述天线簇的簇标识及其对应的信道信 息确定为所述接收设备服务的所述天线簇。 一种用于 DAS的中央处理设备， 包括：
发送单元， 用于向小区内的接收设备发送各天线簇对应的测量参考信号， 其中， 所述小区内的所有天线被划分为至少一个天线簇， 每个所述天线簇包 括至少一根天线， 且每个所述天线簇具有与其对应的簇标识；
接收单元， 用于接收所述接收设备发送的、 所述天线簇的簇标识及其对 应的信道信息；
确定单元， 用于根据所述天线簇的簇标识及其对应的信道信息， 确定为 所述接收设备服务的所述天线簇。 一种 DAS, 包括：
处于同一小区的接收设备、 天线和中央处理设备， 其中， 所述小区内的 所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根天线， 且 每个所述天线簇具有与其对应的簇标识；
所述接收设备用于接收小区内各天线簇对应的测量参考信号； 根据所述 测量参考信号， 获得各所述天线簇对应的信道信息； 向中央处理设备反馈发 送特定的所述天线簇的簇标识及其对应的信道信息；
所述中央处理设备用于向小区内的接收设备发送各天线簇对应的测量参 考信号； 接收所述接收设备发送的、 所述天线簇的簇标识及其对应的信道信 息； 根据所述天线簇的簇标识及其对应的信道信息， 确定为所述接收设备服 务的所述天线簇。 采用上述技术方案后， 本发明实施例提供的用于 DAS的通信方法、 接收 设备、 中央处理设备和 DAS , 通过天线分簇， 能够为该接收设备选择为之服 务的天线簇， 并通过该天线簇为该接收设备服务， 因此， 能够有效降低对相 邻小区的干扰， 提高了 DAS的系统容量。 而且， 由于各天线簇都属于同一小 区， 接收设备在这些天线簇间进行切换不需要经过高层信令的交互， 减少了 切换次数， 从而降低了切换时延。 因此， 本发明实施例提供的用于 DAS的通 信方法、 接收设备、 中央处理设备和 DAS , 能够使整个系统的性能得到有效 提升。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例用于 DAS的通信方法的流程图；
图 2为本发明实施例用于 DAS的通信方法的一种天线分簇方式； 图 3为本发明实施例用于 DAS的通信方法的一种天线分簇方式； 图 4为本发明实施例用于 DAS的通信方法的一种天线分簇方式； 图 5为本发明实施例用于 DAS的通信方法的一种天线分簇方式； 图 6为本发明实施例用于 DAS的通信方法的一种天线分簇方式； 图 Ί为本发明实施例用于 DAS的通信方法的另一种流程图；
图 8为本发明实施例用于 DAS的接收设备的结构框图；
图 9为本发明实施例用于 DAS的接收设备的另一种结构框图； 图 10为本发明实施例用于 DAS的中央处理设备的结构框图；
图 11为本发明实施例用于 DAS的中央处理设备的另一种结构框图； 图 12为本发明实施例的 DAS的结构框图； 图 13为本发明实施例的 DAS的分布式架构示意图；
图 14为本发明实施例的 DAS的集中式架构示意图。
具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅是本发明一部分实施例， 而不 是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出 创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
如图 1所示， 本发明实施例提供的用于 DAS的通信方法， 基于下行数据 的接收设备， 例如 UE或中继站等， 包括下列步骤，
步骤 101 , 接收设备接收小区内各天线簇对应的测量参考信号； 其中， 所 述小区内的所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一 根天线， 且每个所述天线簇具有与其对应的簇标识。
本发明的全部实施例中， 将一个小区内的所有天线划分为至少一个天线 簇， 也就是说， 所有天线簇内的天线数之和等于小区内的天线数， 一个小区 内可以只有一个天线簇， 也可以有多个天线簇； 每个天线簇中包括至少一根 天线， 且每个所述天线簇具有与其对应的簇标识。 天线分簇可以使有限的测 量参考信号资源支持更多的天线。 需要说明的是， 本发明实施例中， 进行分 簇的天线单位可以是一根天线， 也可以是逻辑上视为一根天线的多根天线， 还可以是包括至少一根天线的 AU。
具体的， 图 2至图 5示意了几种本发明实施例的通信方法采用的天线分 簇方式。 图 2所示的天线分簇方式， 在小区 A内四个站址放置天线， 每个站 址为一个天线簇， 以 1、 2、 3、 4作为天线簇的簇标识， 天线簇 1、 2和 3放 在小区的边缘且为三个彼此相对较远的位置， 天线簇 4放置在小区中心， 这 样的部署方式可以保证在小区 A的信号比较均匀地分布。 图 3所示的天线分 簇方式， 在小区 A内两个站址放置天线， 同样以 1、 2、 3、 4作为天线簇的簇 标识， 每个站址分各自分为两个天线簇。 图 4所示的所示的天线分簇方式， 接收设备例如 UE或中继站在小区 A内的分布限定在图中的灰色直线区域， 沿着此直线区域部署天线， 小区 A中放置了八根天线， 分为四个天线簇， 以 1、 2、 3、 4作为天线簇的簇标识， 每个天线簇包括天线 1和天线 2两根天线， 这样的天线部署以及分簇方式，能保证即使 UE或中继站以较高速度运行时也 能保证平滑地切换速度。 图 5所示的天线分簇方式， 小区 A内的有两个 AU, 每个 AU上包括天线 1和天线 2两根天线， 每个 AU作为一个天线簇。
可以理解的是， 图 2至图 5仅是对本发明实施例的通信方法中天线分簇 方式的示例说明， 本发明对此不做限定， 实际上， 可根据系统的性能要求等 实际情况确定小区的天线分簇方式。 具体的， 天线簇的划分准则可遵循： 分 簇后， 天线簇内的各天线尽量经历不同的大尺度衰落信道， 例如， 簇内的各 天线在地理位置相隔尽量远。 当然， 本发明不限于上述准则。
需要说明的是， 通常情况下， 测量参考信号与发送给接收设备的数据是 同时发送同时接收的， 接收设备能够从接收到的信息中， 将测量参考信号提 取出来， 以进行以下步骤的操作。
进一步的， 本步骤可包括：
接收设备接收小区内各天线簇对应的测量参考信号， 其中， 所述测量参 考信号与各所述天线簇一一对应；
根据所述测量参考信号， 确定所述测量参考信号对应的天线簇的簇标识。 这里， 接收设备所接收的测量参考信号与各天线簇是——对应的， 也就 是说， 测量参考信号是各天线簇所特有的， 小区内的各天线簇对应的测量参 考信号各不相同， 使得接收设备可以以该测量参考信号区分出各天线簇， 即 所述接收设备能够根据每个所述天线簇的测量参考信号， 确定出该天线簇的 簇标识。 例如， 所述与各天线簇——对应的测量参考信号为在各天线簇间相 互正交或非正交的信号。 测量参考信号是相互正交时， 可以是天线簇上的不 同时占用相同的频率与时间的任意参考信号， 也可以是使用不同的正交码字 的任意参考信号。 测量参考信号非正交时， 可以是各天线簇上使用不同的非 正交扰码对同一信号加扰后作为各天线簇的测量参考信号， 即在各天线簇间 非正交但施加了不同扰码的信号。 当然， 还可以以其它信号作为测量参考信 号， 本发明对此不做限定。
步骤 102, 根据所述测量参考信号， 获得各所述天线簇对应的信道信息； 本步骤中， 接收设备对各天线簇的测量参考信号进行测量， 从而获得每 个分簇对应的信道信息。 具体的， 信道信息包括信道质量指示 CQI ( Channel Quality Indicator )、 信道相关性、 以及信道的系数等。
步骤 103 , 向中央处理设备发送所述天线簇的簇标识及其对应的信道信 息， 以使所述中央处理设备根据所述天线簇的簇标识及其对应的信道信息确 定为所述接收设备服务的所述天线簇。
这样， 中央处理设备能够根据接收设备发送的、 所述天线簇的簇标识及 其对应的信道信息， 确定为所述接收设备服务的所述天线簇， 其中， 中央处 理设备所确定的天线簇为至少一个， 通常所确定的天线簇为能够为接收设备 服务的最优的天线簇， 例如， 靠近该接收设备的天线所在的天线簇， 或者信 道质量最好天线所在的天线簇等， 并通过所确定的天线簇为该接收设备服务， 同时， 其他天线簇内的天线不发送信号或发送其它信号， 因此， 不需要所有 天线发送相同的信号， 有效降低了对相邻小区的干扰， 提升了系统的容量。
其中， 向中央处理设备发送的天线簇的簇标识及其对应的信道信息可以 是小区内所有的天线簇的簇标识及其对应的信道信息， 也可以是小区内所有 天线簇中的部分天线簇的簇标识及其对应的信道信息， 例如， 接收设备根据 获得的信道信息对天线簇进行预挑选后， 选定的天线簇的簇标识及其对应的 信道信息， 具体的， 在步骤 102之后， 步骤 103之前， 本实施例的通信方法 还包括：
根据所述信道信息， 确定所述接收设备优选使用的天线簇， 其中， 所述 优选使用的天线簇为至少一个； 则本步骤中， 向中央处理设备发送所述天线簇的簇标识及其对应的信道 信息包括：
向中央处理设备发送所述优选使用的天线簇的簇标识及其对应的信道信 息。 这样， 中央处理设备能够根据接收设备发送的、 该接收设备优选使用的 天线簇的所述簇标识及其信道信息， 确定为所述接收设备服务的天线簇。
其中， 接收设备向中央处理设备发送天线簇的簇标识的方式可以是显式 发送， 还可以是隐式发送。 对于显示发送， 接收设备的发送信息中直接包含 簇标识。 而对于隐式发送， 接收设备的发送信息未直接包含簇标识， 簇标识 隐含在接收设备发送的信息中。 例如， 中央处理设备和接收设备之间预先设 定好天线簇与测量参考信号之间的对应关系， 中央处理设备根据所述对应关 系， 从接收端发送的信道信息中直接提取出簇标识， 而无需在发送的信息中 直接包含簇标识。 具体的， 如图 6所示， 对小区占用的频带进行划分， 将所 述频带划分为若干子带， 各子带互不重叠， 将天线簇与子带做绑定， 绑定后 每个天线簇只在其绑定的子带上发送数据， 图 6 中的方格代表不同的子带， 不同子带与不同的天线簇所绑定， 以不同的填充表示。 这时， 各天线簇对应 的测量参考信号为通过与各天线簇对应的子带发送的测量参考信号， 各天线 簇对应的信道信息为各子带的信道信息； 本步骤中， 接收设备向中央处理设 备发送子带的信道信息， 而由于子带与天线簇一一对应， 所述中央处理设备 能够根据所述信道信息对应的子带， 确定所述信道信息对应的天线簇的簇标 识。
本发明实施例提供的用于 DAS的通信方法， 能够为接收设备选择为之服 务的最优的天线簇， 并通过选择的天线簇内天线为该接收设备服务， 同时， 小区其它天线簇内的天线不发送信号或发送其它信号， 因此， 有效降低了对 相邻小区的干扰， 提高了 DAS的系统容量。 而且， 由于各天线簇都属于同一 小区， 接收设备在这些天线簇间进行切换不需要经过高层信令的交互， 减少 了切换次数， 从而降低了切换时延。 因此， 能够有效降低对相邻小区的干扰， 提高了 DAS的系统容量。 因此， 本发明实施例提供的用于 DAS的通信方法， 能够使整个系统的性能得到有效提升。 和图 1所示的通信方法相对应， 本发明实施例又提供了一种用于 DAS的 通信方法，基于发送下行数据的中央处理设备，例如基站或中央处理单元（ CU, Central Unit ), 如图 7所示， 包括下列步骤：
步骤 201 ,中央处理设备向小区内的接收设备发送各天线簇对应的测量参 考信号， 其中， 所述小区内的所有天线被划分为至少一个天线簇， 每个所述 天线簇包括至少一根天线， 且每个所述天线簇具有与其对应的簇标识。
这样， 该接收设备能够通过对测量参考信号的测量而获得各天线簇所对 应的信道信息， 且， 进一步的， 该接收设备还可根据信道信息， 确定该接收 设备希望使用的天线簇， 即该接收设备优选使用的天线簇。
进一步的， 本步骤中， 中央处理设备所发送的测量参考信号与各天线簇 是一一对应的， 也就是说， 测量参考信号是各天线簇所特有的， 小区内的各 天线簇对应的测量参考信号各不相同， 这样， 使得接收设备可以以该测量参 考信号区分出各天线簇， 即所述接收设备能够根据每个所述天线簇的测量参 考信号， 确定出该天线簇的簇标识。 例如， 所述与各天线簇一一对应的测量 参考信号为在各天线簇间相互正交或非正交的信号。 测量参考信号是相互正 交时， 可以是天线簇上的不同时占用相同的频率与时间的任意参考信号， 也 可以是使用不同的正交码字的任意参考信号。 测量参考信号非正交时， 可以 是各天线簇上使用不同的非正交扰码对同一信号加扰后作为各天线簇的测量 参考信号， 即在各天线簇间非正交但施加了不同扰码的信号。 当然， 还可以 以其它信号作为测量参考信号。
步骤 202,接收所述接收设备发送的、 所述天线簇的簇标识及其对应的信 道信息；
其中， 所述天线簇的簇标识及其对应的信道信息可以是小区内所有的天 线簇的簇标识及其对应的信道信息， 也可以是小区内所有天线簇中的部分天 线簇的簇标识及其对应的信道信息。 即具体的， 本步骤可包括：
接收所述接收设备发送的、 所述小区内所有天线簇的簇标识及其对应的 信道信息； 或者
接收所述接收设备发送的、 所述接收设备优选使用的天线簇的簇标识及 其对应的信道信息， 其中， 所述接收设备优选使用的天线簇为至少一个。
本步骤中， 接收到的信息中， 簇标识可以为显式的， 即该信息中直接包 含有簇标识。 簇标识还可以为隐式的， 即该信息中未直接包含簇标识， 簇标 识隐含在该信息中。
这时， 需要中央处理设备和接收设备之间预先设定好天线簇与测量参考 信号之间的对应关系， 中央处理设备根据所述对应关系， 从接收端发送的信 道信息中直接提取出簇标识， 而无需在发送信息中直接包含簇标识。 同样以 图 6所示的分簇方式为例， 将天线簇与子带做绑定， 绑定后每个天线簇只在 其绑定的子带上发送数据， 子带与天线簇是一一对应的， 这时， 本步骤具体 包括：
接收所述接收设备发送的、 所述子带的信道信息；
根据所述信道信息对应的子带， 确定所述信道信息对应的天线簇的簇标 识。
也就是说， 这种情况下， 中央处理设备只需接收接收设备发送的信道信 息， 就可以确定所述信道信息对应的天线簇的簇标识。
步骤 203 ,根据所述天线簇的簇标识及其对应的信道信息， 确定为所述接 收设备服务的所述天线簇。
本步骤中， 中央处理设备能够根据所述天线簇的簇标识及其信道信息， 确定为所述接收设备服务的天线簇， 通常为能够为接收设备服务的最优的天 线簇， 例如， 靠近该接收设备的天线所在的天线簇， 并通过所确定的天线簇 为该接收设备服务， 同时， 其他天线簇内的天线不发送信号或发送其它信号， 因此， 不需要所有天线发送相同的信号， 有效降低了对相邻小区的干扰， 提 升了系统的容量。
进一步的， 当中央处理设备为接收设备确定的天线簇中包括多个天线时， 本实施例的通信方法， 还可包括：
确定所确定的天线簇中为接收设备服务的天线， 以进一步降低对相邻小 区的干扰， 提高 DAS的系统容量。
具体的， 中央处理设备可通过上下行信道的互易性等方式， 确定所确定 的天线簇中为接收设备服务的天线以及传输方案等， 该天线簇内的各天线上 发送的数据可以相同， 也可以不同， 例如， 该天线簇内各天线采用空间复用 或发送分集等传输方案。
本发明实施例提供的用于 DAS的通信方法， 能够为接收设备选择为之服 务的最优的天线簇， 且使用选择的天线簇内天线为该接收设备服务， 同时， 小区其它天线簇内的天线不发送信号或发送其它信号， 因此， 有效降低了对 相邻小区的干扰， 提高了 DAS的系统容量。 而且， 由于各天线簇都属于同一 小区， 接收设备在这些天线簇间进行切换不需要经过高层信令的交互， 减少 了切换次数， 从而降低了切换时延。 因此， 能够有效降低对相邻小区的干扰， 提高了 DAS的系统容量。 因此， 本发明实施例提供的用于 DAS的通信方法， 能够使整个系统的性能得到有效提升。 下面以 LTE(Long Time Evolution, 长期演进)系统为例 , 对本发明实施例 提供的用于 DAS的通信方法进行进一步的详细说明。
本实施例针对 LTE Release 8 (第 8版本 ) 的下行单用户的情况， 在小区 内的不同位置上放置多根天线， 小区中的所有天线被固定划分为 4个天线簇， 例如， 图 2至图 4所示的分簇方式， 每个天线分簇占用 1个天线端口 （LTE 中称之为 antenna port ), 每天线端口上采用 LTE第 8版本中的小区公共导频 CRS ( Cell-specific Reference Signal, 小区参考信号） 为作为测量参考信号的 正交导频， 这样， UE可以根据测量参考信号的不同天线端口区分并确认天线 簇。 本实施例包括：
步骤 301 , 基站（中央处理设备） 向小区内的 UE (接收设备）发送各天 线簇对应的正交导频信号。
步骤 302, UE接收各天线簇对应的正交导频信号。
步骤 303 , UE根据各天线簇对应的正交导频信号， 获得各天线簇对应的 信道信息。
本实施例中， 各天线簇对应的信道信息为 CQI。
步骤 304, UE根据各天线簇对应的信道信息， 确定 UE优选使用的天线 簇。
其中， UE优选使用的天线簇为至少一个。
步骤 305, UE向基站发送所述优选使用的天线簇的簇标识及其信道信息。 具体的，若 UE每次只选择一个天线簇时，本实施例即从 4个天线簇中选 择 1个优选使用的天线簇时， UE向基站发送所述接收设备优选使用的天线簇 对应的预编码矩阵指示器 PMI ( Precoding Matrix Indicator ) 和该天线簇对 应的信道信息 CQI, 其中， 所述 PMI与预先设定的预编码矩阵， 即天线分簇 码本相对应， 基站接收到 PMI后， 能够根据 PMI及所述预编码矩阵， 获得所 述优选使用的天线簇的所述簇标识。 其中， PMI 与预先设定的预编码矩阵的 对应关系， 即天线分簇码本可如表一所示。
而若 UE每次选择多个天线簇时，例如，本实施例从 4个天线簇中选择两 个优选使用的天线簇时， UE同样可向基站发送所述接收设备优选使用的天线 簇对应的预编码矩阵指示器 PMI ( Precoding Matrix Index )和优选使用的天 线簇对应的信道信息 CQI, 其中， 所述 PMI与预先设定的预编码矩阵， 即天 线分簇码本相对应， 基站接收到 PMI后， 能够根据 PMI及所述预编码矩阵， 获得所述优选使用的天线簇的所述簇标识。 其中， PMI 与预先设定的预编码 矩阵的对应关系， 即天线分簇码本可如表二所示。 此时， UE 向基站发送的 CQI是同时表征了两个天线簇信道信息的一个值， PMI值既能够使基站确定 4 个天线簇里面中 UE优选使用的天线簇，还进一步表征了优选使用的天线簇的 信道信息。
步骤 306, 基站接收 UE发送的、 所述 UE优选使用的天线簇的簇标识及 其信道信息。
步骤 307, 基站根据接收到的、 所述 UE优选使用的天线簇的簇标识及其 信道信息， 确定为 UE服务的天线簇。
具体的， 本实例中， 基站根据 UE发送的 CQI和 PMI, 确定为 UE服务 的天线簇。
进一步的， 若一个天线簇内有多个天线， 则基站可以根据天线簇内各天 线上行时发送的信道探测参考信号 （Sounding Reference Signal )或是 RACH 信道（ Random Access Channel, 随机接入信道） 的接收功率， 选择接收功率 最大的天线作为为 UE服务的天线。
4选 1的天线分簇码本
Figure imgf000015_0001
4选 2的天线分簇码本（其中， j是虚数单位）
Figure imgf000015_0002
本实施例针对 LTE Release 10 (第 10版本） 的下行单用户的情况。 本实 施例中， 以 AU作为分簇单位， 进行天线簇的划分， 每个 AU包括一根或多根 天线， 一个天线簇内可以有一个或多个 AU, 且各天线簇内的 AU包括的天线 数相同； 对小区占用的频带进行划分， 将所述频带划分为若干子带， 各子带 互不重叠， 小区内的所有频带都参与划分， 不存在小区内的某个频带不属于 任意一个划分的情况， 划分后子带的总数等于小区内天线簇的个数， 将天线 簇与子带做绑定， 绑定后每个天线簇只在其绑定的子带上发送数据， 例如图 6 所示的天线分簇方式。 需要说明的是， 每个天线分簇所绑定的子带大小是不 限定的，可以相同，也可以不同。不同的天线簇使用位于不同子带上的 CSI-RS ( Channel State Information Reference Signal, 信道状态信息参考信号 )信号作 为测量参考信号， 即测量参考信号为 CSI-RS。 本实施例包括：
步骤 401 , 基站（中央处理设备） 向小区内的 UE (接收设备）发送各子 带的 CSI-RS, 即各天线簇对应的 CSI-RS。
步骤 402, UE接收各子带对应的 CSI-RS。
步骤 403 , UE根据各天线簇对应的 CSI-RS, 获得各子带的 CQI和 PMI ( Precoding Matrix Indicator, 预编码矩阵指示器）。
其中， CQI即为各子带的信道信息。
步骤 404, UE将所有子带的 CQI和 PMI发送给基站。
本步骤中， UE也可根据各子带的 CQI, 确定 UE优选使用的子带， 其中， UE优选使用的子带为至少一个， 并向基站发送所述优选使用的子带的 CQI 和 PMI。
需要指出的是， 若 AU上只有一个天线， 则 UE发送时需要发送所有子带 的 CQI, 无需发送所有子带的 PMI。 若 AU上有多个天线， 则 UE发送时需要 发送所有子带的 CQI以及 PMI。
步骤 406, 基站接收 UE发送的、 所有子带的 CQI和 PMI。
步骤 407, 基站根据接收到的所有子带的 CQI和 PMI, 进行资源调度， 确定为 UE服务的子带。 由于一个子带只对应于一个天线簇，所以挑选子带的过程即选择为 UE服 务的天线簇的过程。 具体的， 基站根据各子带的信道质量， 选择信道质量最 好的天线簇分配给 UE。 若一个天线簇内存在多个 AU, 则基站可以根据 AU 内各天线上行时发送的信道探测参考信号 （Sounding Reference Signal )或是 RACH信道 ( Random Access Channel, 随机接入信道） 的接收功率， 选择接 收功率最大的 AU作为为 UE服务的 AU。
需要指出的是， 本实施例中， 天线簇与子带的绑定可以是静态的， 也可 以是动态的。 前者可以根据天线在小区内部署后指定， 后者可以由基站根据 需要， 例如用户负载的变化等， 相隔一定的时间后对绑定的方式做调整。
虽然上述两实施例针对 LTE系统而言， 但本发明的通信方法不限于此， 还可应用于其它制式的无线蜂窝系统， 比如 TD-SCDMA ( Time Division- Synchronous Code Division Multiple Access, 时分同步码分多址), WCDMA ( Wideband Code Division Multiple Access,宽带码分多址）系统等等。 与图 1所示的方法相对应， 本发明实施例还提供了用于 DAS的接收设备 80, 如图 8所示， 包括：
接收单元 10, 用于接收小区内各天线簇对应的测量参考信号， 其中， 所 述小区内的所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一 根天线， 且每个所述天线簇具有与其对应的簇标识；
测量单元 11 , 用于根据所述测量参考信号， 获得各所述天线簇对应的信 道信息；
发送单元 12, 用于向中央处理设备发送所述天线簇的簇标识及其对应的 信道信息， 以使所述中央处理设备根据所述天线簇的簇标识及其对应的信道 信息确定为所述接收设备服务的所述天线簇。
本发明实施例提供的用于 DAS的接收设备， 能够为该接收设备选择为之 服务的天线簇， 通过该天线簇为该接收设备服务， 能够有效降低对相邻小区 的干扰， 提高了 DAS的系统容量。 而且， 由于各天线簇都属于同一小区， 接 收设备在这些天线簇间进行切换不需要经过高层信令的交互， 减少了切换次 数，从而降低了切换时延。 因此， 本发明实施例提供的用于 DAS的接收设备， 能够使整个通信系统的性能得到有效提升。
其中， 接收单元 10具体用于接收与各天线簇——对应的测量参考信号， 根据所述测量参考信号， 确定该天线簇的簇标识。 例如， 与各天线簇一一对 应的测量参考信号为在各天线簇间相互正交的信号， 或者为在各天线簇间非 正交但施加了不同扰码的信号。
其中， 发送单元 12可具体用于向中央处理设备发送所述小区内所有天线 簇的簇标识及其信道信息， 也可以具体用于向中央处理设备发送所述小区内 部分天线簇的簇标识及其信道信息。
进一步的，如图 9所示， 本实施例的接收设备 90,还可包括确定单元 13 , 用于根据所述信道信息， 确定接收设备优选使用的天线簇； 此时， 发送单元 息。 在本发明的一个实施例中， 发送单元 12具体用于向中央处理设备发送所 述优选使用的天线簇对应的预编码矩阵指示器， 所述预编码矩阵指示器与预 先设定的预编码矩阵相对应， 所述中央处理设备能够根据所述预编码指示器 及所述预编码矩阵， 获得所述优选使用的天线簇的所述簇标识。
其中， 发送单元 12向中央处理设备发送的簇标识可以为显式发送， 即直 接将簇标识发送给中央处理设备， 也可以是隐式发送， 通过将簇标识隐含于 发送信息中。 例如， 在本发明的一个实施例中， 接收单元 10具体用于接收通 过与各天线簇对应的子带发送的测量参考信号， 其中， 所述天线簇与所述子 带一一对应， 每个所述天线簇只在其对应的子带上发送数据； 测量单元 11具 体用于根据所述测量参考信号， 确定各所述子带的信道信息； 发送单元 12具 体用于向中央处理设备发送所述子带的信道信息。 由于子带与天线簇是一一 对应的， 因此， 此时， 发送单元 12为隐式发送， 中央处理设备能够根据信道 信息对应的子带确定接收设备发送的天线簇的簇标识。 与图 7所示的方法相对应， 本发明实施例还提供了用于 DAS的接收设备 1000, 如图 10所示， 包括：
发送单元 20, 用于向小区内的接收设备发送各天线簇对应的测量参考信 号， 其中， 所述小区内的所有天线被划分为至少一个天线簇， 每个所述天线 簇包括至少一根天线， 且每个所述天线簇具有与其对应的簇标识；
接收单元 21 , 用于接收所述接收设备发送的、 所述天线簇的簇标识及其 对应的信道信息；
确定单元 22, 用于根据所述天线簇的簇标识及其对应的信道信息， 确定 为所述接收设备服务的所述天线簇。
本发明实施例提供的用于 DAS的中央处理设备， 能够为接收设备选择为 之服务的天线簇， 通过该天线簇为该接收设备服务， 能够有效降低对相邻小 区的干扰， 提高了 DAS的系统容量。 而且， 由于各天线簇都属于同一小区， 接收设备在这些天线簇间进行切换不需要经过高层信令的交互， 减少了切换 次数， 从而降低了切换时延。 因此， 本发明实施例提供的用于 DAS的接收设 备， 能够使整个通信系统的性能得到有效提升。
其中， 发送单元 20具体用于向小区内的接收设备发送各天线簇对应的测 量参考信号， 其中， 测量参考信号与各天线簇是一一对应的， 所述接收设备 能够根据所述测量参考信号， 确定所述测量参考信号对应的天线簇的簇标识。 例如， 与各天线簇一一对应的测量参考信号为在各天线簇间相互正交的信号， 或者为在各天线簇间非正交但施加了不同扰码的信号。
其中， 接收单元 21具体用于接收所述接收设备发送的、 所述小区内所有 天线簇的簇标识及其对应的信道信息， 或者接收所述接收设备发送的、 所述 接收设备优选使用的天线簇的簇标识及其对应的信道信息， 其中， 所述接收 设备优选使用的天线簇为至少一个。 在本发明的一个实施例中， 接收单元 21 具体用于接收所述接收设备发送的、 所述接收设备优选使用的天线簇对应的 预编码矩阵指示器， 所述预编码矩阵指示器与预先设定的预编码矩阵相对应。 本实施例的中央处理设备能够根据所述所述预编码矩阵指示器与预先设定的 预编码矩阵， 确定所述接收设备所述优选使用的天线簇对应的簇标识。
其中， 接收单元 21具体用于接收所述小区内所有天线簇的簇标识及其对 应的信道信息或者所述接收设备优选使用的天线簇的簇标识及其对应的信道 信息， 其中， 所述接收设备优选使用的天线簇为至少一个。 在本发明的一个 实施例中， 接收单元 21具体用于接收所述接收设备发送的、 所述接收设备所 述优选使用的天线簇对应的预编码矩阵指示器， 所述预编码矩阵指示器与预 先设定的预编码矩阵相对应， 本实施例的中央处理设备能够根据所述所述预 编码矩阵指示器与预先设定的预编码矩阵， 确定所述接收设备所述优选使用 的天线簇对应的簇标识。
其中， 接收单元 21所接收的信息中， 簇标识可以为显式的， 即该信息中 直接包含有簇标识。 簇标识还可以为隐式的， 即该信息中未直接包含簇标识， 簇标识隐含在该信息中。 当簇标识为隐式时， 在本发明的一个实施例中， 发 送单元 20具体用于向小区内的接收设备发送通过与各天线簇对应的子带发送 的测量参考信号， 其中， 所述天线簇与所述子带一一对应， 每个所述天线簇 只在其对应的子带上发送数据；
贝' J , 如图 11所示， 接收设备 1100的接收单元 21进一步包括：
接收模块 210, 用于接收所述接收设备发送的、 所述子带的信道信息； 确定模块 211 , 用于根据所述信道信息对应的子带， 确定所述信道信息对 应的天线簇的簇标识。 相应的， 本发明实施例还提供了一种 DAS系统 1200, 如图 12所示， 包 括：
处于同一小区的接收设备 5、 天线 6和中央处理设备 7, 其中， 所述小区 内的所有天线 6被固定划分为至少一个天线簇， 每个所述天线簇包括至少一 根天线， 且每个所述天线簇具有与其对应的簇标识；
接收设备 5 用于接收小区内各天线簇对应的测量参考信号； 根据所述测 量参考信号， 获得各天线簇对应的信道信息； 根据所述信道信息， 确定接收 设备优选使用的天线簇； 向中央处理设备 7发送所述天线簇的簇标识及其对 应的信道信息；
中央处理设备 7用于向接收设备 5发送各天线簇对应的测量参考信号； 接收接收设备 5发送的、 所述天线簇的簇标识及其对应的信道信息； 根据所 述天线簇的簇标识及其对应的信道信息， 确定为接收设备 5服务的所述天线 簇。
本发明实施例提供的 DAS , 能够为接收设备选择为之服务的天线簇， 通 过该天线簇为该接收设备服务，能够有效降低对相邻小区的干扰，提高了 DAS 的系统容量。 而且， 由于各天线簇都属于同一小区， 接收设备在这些天线簇 间进行切换不需要经过高层信令的交互， 减少了切换次数， 从而降低了切换 时延。 因此， 本发明实施例提供的用于 DAS的接收设备， 能够使整个通信系 统的性能得到有效提升。
其中，接收设备 5可采用本发明实施例提供的接收设备， 中央处理设备 7 可采用本发明实施例提供的中央处理设备， 前文已经进行了详细说明， 这里 不再赘述。
其中， 本发明实施例提供的 DAS可以为分布式架构， 具体的， 如图 13 所示， 中央处理设备 7包括 CU71和信号源 72, 每个天线 6与各自对应的独 立的信号源 72相连接， CU71与每个信号源 72相连， 每个信号源 72负责将 来自 CU的数字基带信号转换成射频信号，以及将与之相连的分布式天线接收 到的射频信号转换成基带信号并传输给 CU。 CU负责在下行中将需要发送的 数字基带信号分配到不同的独立信号源 72上， 在上行中对来自所有与之相连 信号源 72的数字基带信号进行联合处理。 信号源 71与天线 6位于相同站址， 图 12中的虚线框表示同一个站址。 另外， 本发明实施例提供的 DAS还可以 为集中式架构， 具体的， 如图 14所示， 图 14中的虚线框表示同一个站址， 信号源 72和 CU71可以位于相同的站址， 多个天线 6处于相同的站址。 当然， 本发明实施例的 DAS还可采用其他架构方式， 本发明对此不做限定。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分流程 可以通过计算机程序指令相关的硬件来完成， 前述的程序可以存储于一计算 机可读取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代 码的介质。

Claims

权 利 要 求 书
1、 一种用于分布式天线系统的通信方法， 其特征在于， 包括：
接收设备接收小区内各天线簇对应的测量参考信号， 其中， 所述小区内的 所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根天线， 且每 个所述天线簇具有与其对应的簇标识；
根据所述测量参考信号 , 获得各所述天线簇对应的信道信息；
向中央处理设备发送所述天线簇的簇标识及其对应的信道信息， 以使所述 中央处理设备根据所述天线簇的簇标识及其对应的信道信息确定为所述接收设 备服务的所述天线簇。
2、 根据权利要求 1所述的通信方法， 其特征在于， 所述向中央处理设备发 送所述天线簇的簇标识及其对应的信道信息包括：
向中央处理设备发送所述小区内所有天线簇的簇标识及其对应的信道信 息。
3、 根据权利要求 1所述的通信方法， 其特征在于， 所述根据所述测量参考 信号， 获得各所述天线簇对应的信道信息之后， 所述向中央处理设备发送所述 天线簇的簇标识及其对应的信道信息之前， 所述方法还包括：
所述接收设备根据所述信道信息， 确定所述接收设备优选使用的天线簇， 其中， 所述优选使用的天线簇为至少一个；
则所述向中央处理设备发送所述天线簇的簇标识及其对应的信道信息包 括：
向中央处理设备发送所述优选使用的天线簇的簇标识及其对应的信道信 息。
4、 根据权利要求 3所述的通信方法， 其特征在于， 所述向中央处理设备发 送所述优选使用的天线簇的簇标识包括：
向中央处理设备发送所述优选使用的天线簇对应的预编码矩阵指示器， 所 述预编码矩阵指示器与预先设定的预编码矩阵相对应， 所述中央处理设备能够 根据所述预编码指示器及所述预编码矩阵， 获得所述优选使用的天线簇的所述 簇标识。
5、 根据权利要求 1所述的通信方法， 其特征在于， 所述接收设备接收小区 内各天线簇对应的测量参考信号包括：
接收设备接收小区内各天线簇对应的测量参考信号， 其中， 所述测量参考 信号与各所述天线簇一一对应；
根据所述测量参考信号， 确定所述测量参考信号对应的天线簇的簇标识。
6、 根据权利要求 5所述的通信方法， 其特征在于， 所述与各天线簇一一对 应的测量参考信号为在各天线簇间相互正交的信号， 或者在各天线簇间非正交 但施加了不同扰码的信号。
7、 根据权利要求 1所述的通信方法， 其特征在于，
所述各天线簇对应的测量参考信号为通过与各天线簇对应的子带发送的测 量参考信号， 其中， 所述天线簇与所述子带一一对应， 每个所述天线簇只在其 对应的子带上发送数据；
所述各天线簇对应的信道信息为各所述子带的信道信息；
则所述向中央处理设备发送所述天线簇的簇标识及信道信息包括： 向中央处理设备发送所述子带的信道信息， 所述中央处理设备能够根据所 述信道信息对应的子带， 确定所述信道信息对应的天线簇的簇标识。
8、 一种用于分布式天线系统的通信方法， 其特征在于， 包括：
向小区内的接收设备发送各天线簇对应的测量参考信号， 其中， 所述小区 内的所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根天线， 且每个所述天线簇具有与其对应的簇标识；
接收所述接收设备发送的、 所述天线簇的簇标识及其对应的信道信息； 根据所述天线簇的簇标识及其对应的信道信息， 确定为所述接收设备服务 的所述天线簇。
9、 根据权利要求 8所述的通信方法， 其特征在于， 所述向小区内的接收设 备发送各天线簇对应的测量参考信号包括：
向小区内的接收设备发送各天线簇对应的测量参考信号， 其中， 测量参考 信号与各天线簇是一一对应的， 所述接收设备能够根据所述测量参考信号， 确 定所述测量参考信号对应的天线簇的簇标识。
10、 根据权利要求 9所述的通信方法， 其特征在于， 所述与各天线簇—— 对应的测量参考信号为在各天线簇间相互正交的信号， 或者在各天线簇间非正 交但施加了不同扰码的信号。
11、 根据权利要求 8 所述的通信方法， 其特征在于， 所述接收所述接收设 备发送的、 所述天线簇的簇标识及其对应的信道信息包括：
接收所述接收设备发送的、 所述小区内所有天线簇的簇标识及其对应的信 道信息； 或者
接收所述接收设备发送的、 所述接收设备优选使用的天线簇的簇标识及其 对应的信道信息， 其中， 所述接收设备优选使用的天线簇为至少一个。
12、 根据权利要求 11所述的通信方法， 其特征在于， 所述接收所述接收设 备发送的、 所述接收设备优选使用的天线簇的簇标识包括：
接收所述接收设备发送的、 所述接收设备优选使用的天线簇对应的预编码 矩阵指示器， 所述预编码矩阵指示器与预先设定的预编码矩阵相对应。
13、 根据权利要求 8所述的通信方法， 其特征在于，
所述各天线簇对应的测量参考信号为通过与各天线簇对应的子带发送的测 量参考信号， 其中， 所述天线簇与所述子带一一对应， 每个所述天线簇只在其 对应的子带上发送数据；
所述接收所述接收设备发送的、 所述天线簇的簇标识及其对应的信道信息 包括：
接收所述接收设备发送的、 所述子带的信道信息； 根据所述信道信息对应的子带， 确定所述信道信息对应的天线簇的簇标识 (
14、 一种用于分布式天线系统的接收设备， 其特征在于， 包括：
接收单元， 用于接收小区内各天线簇对应的测量参考信号， 其中， 所述小 区内的所有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根天线， 且每个所述天线簇具有与其对应的簇标识；
测量单元， 用于根据所述测量参考信号， 获得各所述天线簇对应的信道信 息；
发送单元， 用于向中央处理设备发送所述天线簇的簇标识及其对应的信道 信息， 以使所述中央处理设备根据所述天线簇的簇标识及其对应的信道信息确 定为所述接收设备服务的所述天线簇。
15、 根据权利要求 14所述的接收设备， 其特征在于， 识及其信道信息。
16、 根据权利要求 14所述的接收设备， 其特征在于， 所述接收设备还包括 确定单元， 用于根据所述信道信息， 确定所述接收设备优选使用的天线簇； 标识及其信道信息。
17、 根据权利要求 16所述的接收设备， 其特征在于， 所述发送单元具体用 于向中央处理设备发送所述优选使用的天线簇对应的预编码矩阵指示器， 所述 预编码矩阵指示器与预先设定的预编码矩阵相对应， 所述中央处理设备能够根 据所述预编码指示器及所述预编码矩阵， 获得所述优选使用的天线簇的所述簇 标识。
18、 根据权利要求 14所述的接收设备， 其特征在于， 所述接收单元具体用 于接收小区内各天线簇对应的测量参考信号， 其中， 所述测量参考信号与各所 述天线簇——对应， 根据所述测量参考信号， 确定所述测量参考信号对应的天 线簇的簇标识。
19、 根据权利要求 14所述的接收设备， 其特征在于，
所述接收单元具体用于接收通过与各天线簇对应的子带发送的测量参考信 号， 其中， 所述天线簇与所述子带——对应， 每个所述天线簇只在其对应的子 带上发送数据；
所述测量单元具体用于根据所述测量参考信号， 确定各所述子带的信道信
Figure imgf000027_0001
20、 一种用于分布式天线系统的中央处理设备， 其特征在于， 包括： 发送单元， 用于向小区内的接收设备发送各天线簇对应的测量参考信号， 其中， 所述小区内的所有天线被划分为至少一个天线簇， 每个所述天线簇包括 至少一根天线， 且每个所述天线簇具有与其对应的簇标识；
接收单元， 用于接收所述接收设备发送的、 所述天线簇的簇标识及其对应 的信道信息；
确定单元， 用于根据所述天线簇的簇标识及其对应的信道信息， 确定为所 述接收设备服务的所述天线簇。
21、 根据权利要求 20所述的中央处理设备， 其特征在于， 所述发送单元具 体用于向小区内的接收设备发送各天线簇对应的测量参考信号， 其中， 测量参 考信号与各天线簇是一一对应的， 所述接收设备能够根据所述测量参考信号， 确定所述测量参考信号对应的天线簇的簇标识。
22、 根据权利要求 20所述的中央处理设备， 其特征在于， 所述接收单元具 体用于接收所述接收设备发送的、 所述小区内所有天线簇的簇标识及其对应的 信道信息， 或者接收所述接收设备发送的、 所述接收设备优选使用的天线簇的 簇标识及其对应的信道信息， 其中， 所述接收设备优选使用的天线簇为至少一 个。
23、 根据权利要求 22所述的中央处理设备， 其特征在于， 所述接收单元具 体用于接收所述接收设备发送的、 所述接收设备优选使用的天线簇对应的预编 码矩阵指示器， 所述预编码矩阵指示器与预先设定的预编码矩阵相对应。
24、 根据权利要求 20所述的中央处理设备， 其特征在于，
所述发送单元具体用于向小区内的接收设备发送通过与各天线簇对应的子 带发送的测量参考信号， 其中， 所述天线簇与所述子带一一对应， 每个所述天 线簇只在其对应的子带上发送数据；
所述接收单元包括：
接收模块， 用于接收所述接收设备发送的、 所述子带的信道信息； 确定模块， 用于根据所述信道信息对应的子带， 确定所述信道信息对应的 天线簇的簇标识。
25、 一种分布式天线系统， 其特征在于， 包括：
处于同一小区的接收设备、 天线和中央处理设备， 其中， 所述小区内的所 有天线被划分为至少一个天线簇， 每个所述天线簇包括至少一根天线， 且每个 所述天线簇具有与其对应的簇标识；
所述接收设备用于接收小区内各天线簇对应的测量参考信号； 根据所述测 量参考信号， 获得各所述天线簇对应的信道信息； 向中央处理设备反馈发送所 述天线簇的簇标识及其对应的信道信息；
所述中央处理设备用于向小区内的接收设备发送各天线簇对应的测量参考 信号； 接收所述接收设备发送的、 所述天线簇的簇标识及其对应的信道信息； 根据所述天线簇的簇标识及其对应的信道信息， 确定为所述接收设备服务的所 述天线簇。
PCT/CN2011/080366 2010-12-17 2011-09-29 用于分布式天线系统的通信方法、装置和系统 Ceased WO2012079407A1 (zh)

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