WO2012000252A1 - 一种协作发送点的选择方法及选择装置 - Google Patents

一种协作发送点的选择方法及选择装置 Download PDF

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Publication number
WO2012000252A1
WO2012000252A1 PCT/CN2010/077885 CN2010077885W WO2012000252A1 WO 2012000252 A1 WO2012000252 A1 WO 2012000252A1 CN 2010077885 W CN2010077885 W CN 2010077885W WO 2012000252 A1 WO2012000252 A1 WO 2012000252A1
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WO
WIPO (PCT)
Prior art keywords
coordinated
cell
base station
coordinated cell
transmission point
Prior art date
Application number
PCT/CN2010/077885
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English (en)
French (fr)
Inventor
王文焕
刘敏
姚珂
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to JP2013516960A priority Critical patent/JP5560372B2/ja
Priority to EP10853955.2A priority patent/EP2590450A4/en
Publication of WO2012000252A1 publication Critical patent/WO2012000252A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • 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
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • 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

Definitions

  • the present invention relates to the field of digital communications, and more particularly to a method and apparatus for selecting a coordinated transmission point in an evolved system of a broadband wireless communication system. Background technique
  • IMT-Advanced International Mobile Telecommunications Advanced
  • IMT-Advanced International Mobile Telecommunications Advanced
  • the target peak rate is: low-speed mobile, hot-cover coverage scenario lGbit/ Above s, 100Mbit/s in high-speed mobile and wide-area coverage scenarios.
  • CoMP Coordinated Multi-Point
  • OFDM Orthogonal Frequency Division Multiplexing
  • eNB The Evolved Node Base
  • ICI Inter-Carrier Interference
  • 3GPP has accepted CoMP as one of the IMT-Advanced technologies.
  • QoS Quality of Service
  • CoMP means that when a UE is at multiple cell edges, multiple UEs jointly perform multiple UEs. Point data transmission/reception, or coordination and scheduling between multiple cells, thereby eliminating inter-cell interference and improving signal quality and data throughput.
  • CoMP is divided into the following two categories:
  • JP Joint processing
  • CoMP Cooperative Cell Set A set of transmission points set by the network according to the geographical distribution of the cell directly or indirectly participates in a Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • CoMP measurement cell set A cell that periodically or non-periodically measures the relevant channel state and statistical information according to the network requirements.
  • Serving cell A cell that transmits a Physical Downlink Control Channel (PDCCH) to a mobile station. There is only one serving cell in the communication process.
  • PDCCH Physical Downlink Control Channel
  • the cell selected into the CoMP set should have such characteristics: the CoMP cell uses the same frequency band; the subframes and symbols of the CoMP cell air interface are basically aligned; when the cells in the CoMP set belong to different base stations, the X2 can pass X2. Interface interconnection for message delivery.
  • the base station is divided into the JP and CS/CB modes only according to the user sharing situation, and most of the cooperative sets are set to the static or semi-static mode, and the specific process of determining the downlink coordinated transmission point is not provided.
  • the present invention provides a method for selecting a coordinated transmission point, which is used for Select a coordinated sending point in the downlink coordinated multi-point communication, where the following steps are included:
  • Step A The serving base station receives measurement information of the coordinated cell reported by the mobile station, where the measurement information is: information obtained by the mobile station after performing measurement on a predetermined coordinated cell in the first coordinated cell list of the serving cell, and Establishing, according to the reported measurement information, a second coordinated cell list of the serving cell, where the coordinated cell in the second coordinated cell list is: in the first coordinated cell list, the signal strength is greater than a predetermined first threshold value.
  • Step B The serving base station determines, as the serving cell coordinated transmission point, the coordinated cell that meets the preset cooperation condition in the second coordinated cell list.
  • the mobile station performs measurement on the coordinated cell in the first coordinated cell list: the mobile station moves to the edge of the serving cell or The measurement triggered by the serving base station or by the mobile station itself when the quality of service of the serving cell fails to meet the predetermined user demand.
  • the first coordinated cell Determining to be a collaborative transmission point, and determining that the working mode of the first coordinated cell is a joint processing mode.
  • the selecting method wherein, in the step B, when the second coordinated cell list has a second coordinated cell that is different from the serving base station, the method further includes: The base station to which the second coordinated cell belongs performs information exchange, and when the information of the interaction indicates that the second coordinated cell meets a preset cooperation condition, the second coordinated cell is determined as a coordinated sending point.
  • the selecting method wherein, when the information of the interaction indicates that the second cooperative cell satisfies at least one of the following cooperation conditions, determining the second coordinated cell as a collaborative sending point:
  • the load of the second coordinated cell is less than a predetermined second threshold; b.
  • the resources occupied by the second coordinated cell do not conflict with the resources allocated by the serving base station to the mobile station;
  • the load of the second coordinated cell is greater than a predetermined third threshold and less than a predetermined fourth threshold
  • the measured power of the second coordinated cell is greater than a predetermined power threshold
  • the measured power of the second coordinated cell is a coordinated cell with the strongest or second strongest measured power in the second coordinated cell list.
  • the coordinated sending point different from the serving base station and the serving base station further includes at least one of the following steps:
  • a working mode of the coordinated transmission point where the occupied resource conflicts with the serving cell allocation resource is a cooperative scheduling or a beamforming mode
  • the working mode of the cooperative transmission point is determined as a joint processing mode
  • the working mode of the cooperative sending point of the serving base station that is unable to satisfy the user throughput rate is determined as the joint processing mode
  • the operational mode of the cooperative transmission point whose load is greater than the predetermined third threshold and less than the predetermined fourth threshold is determined as the cooperative scheduling or beamforming mode.
  • the selecting method after the step B, further comprising: the serving base station notifying the mobile station to measure channel information of the coordinated transmission point; and the serving base station transmitting a point according to the collaboration
  • the channel measurement information determines an initial operating parameter of the coordinated transmission point, and sends the initial working parameter to the cooperative transmission point.
  • the selection method wherein the channel information of the cooperative transmission point is measured by the cooperative transmission point according to the detection signal sent by the mobile station by the coordinated transmission point.
  • a selection device for cooperative transmission points is provided for cooperation in downlink multi-point Select a collaborative sending point in the letter, including: a serving base station,
  • the serving base station includes:
  • a first processing module configured to receive measurement information of a coordinated cell reported by the mobile station, where the measurement information is: information obtained by the mobile station after performing measurement on a predetermined coordinated cell in the first coordinated cell list of the serving cell And establishing, according to the reported measurement information, a second coordinated cell list of the serving cell, where the coordinated cell in the second coordinated cell list is: the first coordinated cell list, the signal strength is greater than a predetermined first threshold Cooperative cell of value;
  • a determining module configured to determine, as the coordinated sending point, the coordinated cell that meets the preset cooperation condition in the second coordinated cell list.
  • the selecting device wherein the determining module comprises:
  • a first determining module configured to determine, when the second coordinated cell list, a first coordinated cell that is the same base station as the serving base station, and determines the first coordinated cell as a coordinated sending point, and determines the The working mode of the first coordinated cell is a joint processing mode.
  • the selecting device wherein the determining module comprises:
  • an interaction module configured to perform information interaction with a base station to which the second coordinated cell belongs when the second coordinated cell list has a second coordinated cell that is different from the serving base station;
  • a second determining module configured to determine, when the information of the interaction indicates that the second coordinated cell meets a preset cooperation condition, the associated second coordinated cell as a coordinated sending point.
  • the selecting device wherein the second determining module is further configured to: when the information of the interaction indicates that the second coordinated cell meets at least one of the following cooperation conditions, the second The coordinated cell is determined to be a collaborative sending point:
  • the load of the second coordinated cell is less than a predetermined second threshold
  • the resources occupied by the second coordinated cell do not conflict with the resources allocated by the serving base station to the mobile station;
  • the load of the second coordinated cell is greater than a predetermined third threshold and less than a predetermined fourth threshold;
  • the measured power of the second coordinated cell is greater than a predetermined power threshold
  • the measured power of the second coordinated cell is a coordinated cell with the strongest or second strongest measured power in the first coordinated cell list.
  • the selecting device wherein the second determining module is further configured to determine an operating mode of the cooperative sending point according to at least one of the following manners:
  • a working mode of the coordinated transmission point where the occupied resource conflicts with the serving cell allocation resource is a cooperative scheduling or a beamforming mode
  • Determining, by the working mode of the coordinated transmission point that the occupied resource does not conflict with the allocated resource of the serving cell, is a joint processing mode
  • the working mode of the cooperative transmission point is determined as a joint processing mode
  • the working mode of the cooperative sending point of the serving base station that cannot meet the user throughput requirement is determined as the joint processing mode
  • the operational mode of the cooperative transmission point whose load is greater than the predetermined third threshold and less than the predetermined fourth threshold is determined as the cooperative scheduling or beamforming mode.
  • the selecting device where the serving base station further includes:
  • a second processing module configured to notify the mobile station to measure channel information of the coordinated transmission point
  • a parameter determining module configured to determine initial working parameters of the coordinated transmission point according to channel measurement information of the coordinated transmission point And transmitting the initial working parameters to the collaborative sending point.
  • the serving base station receives measurement information of the coordinated cell reported by the mobile station, where the measurement information is: the mobile station performs measurement on the coordinated cell in the first coordinated cell list of the serving cell.
  • the information obtained after the quantity is determined, and the second coordinated cell list of the serving cell is established according to the reported measurement information, and the coordinated cell that meets the preset cooperation condition in the second coordinated cell list is determined as the coordinated sending point, and the provided A multi-point cooperation implementation that enters the downlink multi-point cooperation mode from the normal working mode, so that the mobile station located at the edge of the cell can obtain better service quality and user throughput.
  • FIG. 1 is a schematic flowchart of a method for selecting a coordinated transmission point according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for selecting a coordinated transmission point according to another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of base station cooperation in an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of interaction between a downlink multi-point cooperative base station and an implementation process according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a device for selecting a coordinated transmission point according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings and specific embodiments.
  • FIG. 1 is a schematic flowchart diagram of a method for selecting a coordinated transmission point according to an embodiment of the present invention. As shown in FIG. 1, the method for implementing multi-point cooperative communication in this embodiment includes the following steps:
  • Step 101 The serving base station establishes a second coordinated cell list according to the measurement information of the coordinated cell reported by the mobile station.
  • the serving base station receives measurement information of the coordinated cell reported by the mobile station, where the measurement information is: information obtained by the mobile station after performing measurement on a predetermined coordinated cell in the first coordinated cell list of the serving cell, according to the The reported measurement information establishes a second coordinated cell list of the serving cell, where the coordinated cell in the second coordinated cell list is: the coordinated cell in the first coordinated cell list whose signal strength is greater than a predetermined first threshold.
  • the coordinated cell measurement information on the mobile station is: signal strength measurement information of the coordinated cell in the first coordinated cell list whose signal strength is greater than a predetermined first threshold, or The measurement information of all the coordinated cells in the first coordinated cell list.
  • the coordinated cell whose signal strength is greater than the predetermined first threshold is selected by the mobile station, and the measurement information of the coordinated cell is reported to the serving base station; for the second case, the signal strength is greater than the predetermined first
  • the coordinated cell of the threshold is selected by the serving base station according to the measurement information reported by the mobile station.
  • the foregoing first coordinated cell list may be preset by a system, such as a serving base station, according to a geographical location of a surrounding area. Further, the foregoing first coordinated cell list may be static or semi-static, and may be notified by the serving base station to the mobile station UE of the serving cell by using a broadcast message or a control message.
  • the mobile station performs measurement on the coordinated cell in the predetermined first coordinated cell list, where: the mobile station moves to the edge of the serving cell or the quality of service of the serving cell cannot satisfy the predetermined
  • the measurement triggered by the serving base station or by the mobile station itself exemplarily, whether the foregoing quality of service satisfies a predetermined user requirement may be corresponding to a value of a QoS value or a bit error rate
  • the comparison of the threshold values is determined.
  • the serving base station determines, as the coordinated sending point of the serving cell, the coordinated cell that meets the preset cooperation condition in the second coordinated cell list.
  • the first coordinated cell is determined as a coordinated sending point, and the first The working mode of a coordinated cell is a joint processing mode.
  • the method further includes: the serving base station and the base station to which the second coordinated cell belongs
  • the serving base station and the base station to which the coordinated cell belongs exchange information through the X2 interface.
  • the information exchanged between the serving base station and the base station to which the coordinated cell belongs, that is, the cooperative base station may include station load information, resource occupation information, and/or power allocation information.
  • the second coordinated cell when the information of the interaction indicates that the load, occupied resources, and/or measurement power of the base station to which the second coordinated cell belongs meets a predetermined cooperation condition, determining the second coordinated cell as a cooperative transmission point.
  • the second coordinated cell when the information of the interaction indicates that the second coordinated cell meets at least one of the following cooperation conditions, the second coordinated cell is determined as a cooperative sending point: a, the second coordinated cell The load is less than a predetermined second threshold;
  • the resources occupied by the second coordinated cell do not conflict with the resources allocated by the serving base station to the mobile station;
  • the measured power of the second coordinated cell is greater than a predetermined power threshold
  • the measured power of the second coordinated cell is a coordinated cell with the strongest or second strongest measured power in the first coordinated cell list.
  • the first collaboration is required.
  • the base station to which the coordinated cell of the cell list belongs operates in the same frequency band as the serving base station, and is synchronized.
  • step 101 of the embodiment of the present invention when at least one of the following conditions is satisfied, it is determined that the mobile station moves to the edge of the serving cell:
  • the at least one of the following parameters of the serving cell is lower than a corresponding fifth threshold: reference signal received power RSRP, reference signal received quality RSRQ, signal to noise power ratio SNR, signal to interference noise power ratio SINR;
  • Condition 2 in the following parameters of the at least one coordinated cell in the first coordinated cell list At least one is higher than the corresponding sixth threshold: reference signal received power, reference signal received quality, signal to noise power ratio, and signal to noise power ratio.
  • the triggering mechanism of the coordinated cell measurement may be: when the UE periodically measures the RSRP, the RSRQ, the SINR, and the SNR of the local cell to be less than a predetermined threshold, triggering the coordinated cell measurement.
  • the RRC measurement configuration IE may require the user moving to the cell edge to perform coordinated cell measurement, and the required measured signal strength information may be RSRP, RSRQ, RSSI, SINR, SNR, etc.; or may be measured according to the neighbor cell list. As a result, the cell that meets the requirements of the coordinated cell list is selected, and the coordinated cell measurement information is updated.
  • the mobile station performs coordinated cell measurement according to the radio resource controller RRC (Radio Resource Control) measurement configuration information unit (IE, Information Element), and the measurement result is selected by the mobile station to report or report all.
  • RRC Radio Resource Control
  • the condition for selecting the reporting may be the coordinated cell having the strongest received power, the second strongest received power, or the measured neighboring area exceeding the predetermined threshold among all the coordinated neighboring cell information arranged by the power size.
  • the mobile station may automatically initiate coordinated cell measurement when the periodic measurement serving cell channel quality is close to the cell edge according to the system configuration message.
  • the serving cell establishes a second coordination d, a cell list, i.e., a mobile station candidate cooperating cell transmission point list, based on measurement information of the mobile station moving to the cell edge or the mobile station whose quality of service does not satisfy the predetermined user demand.
  • the mobile station that reports the measurement information of the coordinated cell may be a group of mobile stations with almost the same geographical location.
  • the coordinated sending point different from the serving base station and the serving base station further includes at least one of the following steps:
  • a working mode of the coordinated transmission point where the occupied resource conflicts with the serving cell allocation resource is a cooperative scheduling or a beamforming mode
  • the cooperative transmission point and the serving cell are both single antennas or virtual single antennas, determining a working mode of the coordinated transmission point as a joint processing mode;
  • the working mode of the collaborative sending point that fails to meet the user throughput requirement is determined as the joint processing mode
  • the operational mode of the cooperative transmission point whose load is greater than the predetermined third threshold and less than the predetermined fourth threshold is determined as the cooperative scheduling or beamforming mode.
  • auxiliary measurement is usually performed according to different requirements of the working mode.
  • the measurement pilot configuration, the transmission mode, the transmission period, and/or the base station sent by the mobile station or used to notify the coordinated cell are determined.
  • the embodiment of the present invention provides a multi-point cooperation implementation manner that enters the multi-point cooperation mode from the normal working mode.
  • the technical solution of the embodiment of the present invention enables the mobile station located at the edge of the cell to obtain better quality of service (QoS, Quality of Service and user throughput.
  • QoS quality of service
  • the working mode of the cell and the coordinated transmission point of the coordinated transmission point is not fixed, but may be changed according to the actual wireless channel environment, so that the cell can be in a better manner. Working together, it helps to improve the user rate and reliability at the edge of the cell.
  • the method of the embodiment of the present invention after determining the cooperative sending point, preferably, after determining the working mode of the collaborative sending point and the collaborative working point, further includes:
  • Step 103 The serving base station notifies the mobile station to measure channel information of the coordinated transmission point, where the channel measurement is an auxiliary measurement; exemplarily, the measured channel information includes at least one of the following measurement parameters: a coordinated cell Channel matrix, channel covariance, interference strength, interference beam pointing, etc.
  • the channel information of the coordinated transmission point is sent by the coordinated transmission point according to the mobile station.
  • the detection signal is obtained by the cooperative transmission point measurement.
  • Step 104 The serving base station determines an initial working parameter of the coordinated sending point according to channel measurement information of the coordinated sending point, and sends the initial working parameter to the coordinated sending point.
  • the serving base station may further configure a measurement pilot of the coordinated cell, and the mobile station performs channel measurement of the coordinated transmission point.
  • the measurement pilots are orthogonal to the cell of the serving base station and the cell of the cooperative base station, and the channel information is measured by the mobile station and fed back to the serving base station for adjusting the downlink cooperation weight.
  • the serving base station may further request the mobile station to send a specific detection signal (Sounding) to perform channel measurement of the coordinated transmission point by the base station to which the coordinated cell belongs.
  • the detection signal may be pre-configured by the serving base station to notify the mobile station to be transmitted by the mobile station.
  • the channel information of the coordinated transmission point is obtained by the cooperative transmission point according to the sounding of the mobile station of the coordinated cell according to the detection signal sent by the mobile station.
  • the mobile station sends the predetermined detection signal to the base station to which the coordinated transmission point belongs, and the cooperative base station to which the coordinated cell belongs, performs cooperative transmission point channel measurement according to the Sounding signal sent by the mobile station, and obtains uplink of the coordinated cell.
  • the channel parameters such as the channel matrix, and the obtained channel parameters such as the uplink channel matrix can be used to adjust the downlink cooperative weight.
  • the cooperative base station sends the channel information of the coordinated transmission point to the serving base station; the serving base station determines an initial working parameter of the coordinated transmission point according to channel information of the coordinated transmission point, and the initial working parameter Send to the collaborative sending point.
  • the initial operating parameters described above illustratively include the transmission weights of the cooperative base stations.
  • the serving base station selects the cooperative base station according to the result of the foregoing auxiliary measurement, performs information interaction with the cooperative base station, determines initial working parameters of the coordinated transmission point, and transmits according to the cooperation requirement, and then cooperatively transmits the determined initial working parameters according to the point. Can start working together.
  • the determined initial working parameters include: resource scheduling, the base station of the coordinated cell, that is, the transmission weight of the cooperative base station, and/or the data of the coordinated mobile station;
  • the cooperative transmission point of the /CB mode the determined initial working parameters include: resource scheduling, and/or transmission weight of the cooperative base station.
  • multi-cell optimization is performed, and the multi-selection working mode not only reduces system-level interference, but also further improves user rate and reliability at the cell edge.
  • the mobile station is required to work in the connection state of the radio resource controller RRC, and moves to the cell edge, and the coordinated cell works in the same frequency band, and the small interval is kept synchronized.
  • the CoMP working mode of the embodiment of the present invention is exemplified below.
  • the method for configuring the working mode of the coordinated cell in the cooperation area is as shown in FIG. 2, and mainly includes four steps:
  • Step 201 The mobile station performs the coordinated cell measurement and reports the measurement information according to the configuration manner and the measurement content of the system-as-a-service base station configuration;
  • Step 202 Perform information interaction between the base stations to determine a coordinated sending point.
  • Step 203 Notify the cooperative base station to perform further auxiliary measurement.
  • Step 204 Determine a cooperation mode and a working parameter of the collaborative sending point.
  • the base station to which the coordinated cell belongs is the same eNB as the serving base station, there is no need to perform information interaction between the base stations.
  • the connection state measurement process in LTE includes: E-UTRAN sends an RRC reconfiguration IE, the reconfiguration IE includes: measurement ID and type, measurement object, measurement quantity, measurement The number of reports, the reporting criteria, and the like; the UE performs measurement according to the measurement configuration IE request sent by the RRC, and determines whether it needs to be reported according to the measurement reporting standard.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • RSSI Receiver Signal Strength Indicator
  • RSRQ N x RSRP/(E-UTRA RSSI)
  • E-UTRA Evolved Universal Terrestrial Radio Access Network carrier
  • An example of the coordinated cell measurement procedure triggered in the LTE in the embodiment of the present invention includes the following steps.
  • the measurement RSRP is taken as an example:
  • Step 1 Detecting RSRP ⁇ 1 of the serving cell triggers coordinated cell measurement, where I is a pre-configured threshold of the serving cell;
  • Step 2 The E-UTRAN sends an RRC reconfiguration message, and configures a measurement information element (IE).
  • Step 3 The mobile station initiates measurement of the neighboring cell according to the configuration of the measurement configuration IE by measuring the time slot to notify the downlink physical layer (DLPHY) according to the configuration of the measurement configuration IE.
  • DLPHY downlink physical layer
  • Step 4 The mobile station performs the measurement result discrimination and the RRC message of the mobile station.
  • Step 5 The mobile station RRC encapsulates the measurement result into an RRC message and reports it to the serving base station eNB.
  • the difference from the R8 version is that the selected cell list is not the cell list but the coordinated cell list.
  • the R8 cycle of the prior art measures information such as RSRP for triggering the coordinated cell measurement. If it is an intra-frequency synchronization network, the neighbor cell list and the coordinated cell list may be the same, and the coordinated cell list may partially overlap with the neighbor cell list. When there is a coincidence, the measurement result may be updated according to the neighbor cell measurement result, and the coordinated cell measurement quantity is reduced. By configuring the RRC IE to indicate that there is no coordinated cell measurement that coincides with the neighboring cell.
  • the condition for triggering the coordinated cell measurement may be that the RSRP of the serving cell and/or the RSRQ is lower than the configured threshold or the RSRP and/or RSRQ of the neighboring cell as the coordinated cell are higher than a certain threshold.
  • the information exchanged between the base stations through the X2 interface includes the existing letter of the R8 version.
  • New exchanged IEs for interest and collaboration base stations includes: a Relative Narrowband Tx Power (RTN) IE, which is used to indicate whether the transmit power of each physical resource block (PRB) is lower than a threshold of the RNTP; (Load Indicator Information Element ), used to indicate the load status; Radio Resource Status IE, used to indicate the usage of the uplink and downlink PRBs; Capacity Value IE, used to indicate E - The number of resources that can be used in all UTRAN resources.
  • RTN Relative Narrowband Tx Power
  • PRB physical resource block
  • Capacity Value IE used to indicate E - The number of resources that can be used in all UTRAN resources.
  • the newly added interaction information of the cooperative base station includes:
  • UE data IE mobile station data information unit
  • the UE resource IE is used to indicate the resource occupancy of the coordinated UE by the serving base station, so that the cooperative base station determines whether to use the JP mode or the CS/CB mode according to the load condition of the mobile station;
  • the mobile station channel state information (UE CSI IE) is used to indicate channel measurement data of the cooperative base station interaction for calculating the transmission weight of the cooperative base station.
  • the serving base station may further assist the measurement according to the measurement result of the cooperative base station and the interaction result of the X2 interface.
  • the base station with strong cell signal strength in the coordinated transmission point list may be selected, and the next measurement may be performed according to the initially determined cooperation mode.
  • each coordinated base station performs auxiliary measurement by configuring the measurement pilot of the coordinated cell.
  • the measurement may be performed by the coordinated cell by the specific sounding of the configuration UE, and the measurement content may be a channel matrix, a covariance of the channel, an interference strength, and/or an interference beam direction; wherein the measured content may be according to the cooperative base station working mode, cooperation
  • the configuration mode is different.
  • the serving base station when performing the working mode configuration of the cooperative sending point and the initial working parameter configuration of the coordinated sending point, preferentially selects the cooperation with the serving base station according to the result of the foregoing auxiliary measurement and the result of the cooperative scheduling.
  • Base station performs JP collaboration, other non-same sites
  • the cooperative base station is scheduled as CS/CB, which can reduce the amount of interaction of the X2 interface between the base stations.
  • the serving base station preferentially selects a cooperative base station with light load to cooperate according to the interaction result of the X2 interface; preferentially selects a base station with strong interference to cooperate; according to the data buffer (buffer) and quality of service (Qos) scheduled by the user Selecting the cooperation mode; according to the further channel measurement result, the cooperative base station is selected as the JP cooperative base station, and the cooperation data, the cooperative working parameters, and the cooperative scheduling are performed through the inter-base station interface. According to the result of the further channel measurement, the cooperative base station is selected as the CS/CB cooperative base station, and the cooperative scheduling is performed through the interface between the base stations, and the working parameters are interactively coordinated.
  • the base station (eNB) to which the target serving cell belongs sends a test command to the mobile station through the downlink control channel, and requires the mobile station to perform measurement on the configured cell as required.
  • the configured cell is in the pre-configured first coordinated cell list. Community.
  • the measurement includes: RSRP, RSRQ, etc.
  • RSRP radio resource identifier
  • RSRQ Radio Service Set
  • the RSRP range for triggering coordinated cell measurement may be varied, and the range selection depends on the application scenario of the cell, such as a macro cell, a cell, a micro cell, and the like.
  • the signal strength of the neighboring cell measured as the coordinated cell is as shown in Table 1 below.
  • the mobile station selects the result of the qualified cell according to the measurement result of the first step and reports it.
  • the reporting criterion may be: the pilot signal strength condition of the neighboring cell satisfies the threshold of the serving cell pilot signal being greater than the set threshold.
  • the threshold value may be set as: (coordinated cell reference symbol Receive power - received power of the serving cell reference symbol)
  • the threshold value can be set by the serving base station according to the service requirements of the mobile station and the system load, or directly according to the RSRP value of the neighboring cell. In this example, the measurement results of cell 4 and cell 5 are not reported. Conditions, not reported, the measured results of cell 1 (cell 1 ), cell 2 (cell 2 ), and cell 3 (cell 3) reported are as follows:
  • the process proceeds to the fourth step. Otherwise, the X2 interface is started to exchange information between the measurement cell, that is, the base station to which the coordinated cell belongs, and the serving base station. For details of the interaction, refer to Table 3 below. In this example, cell l and cell O are set to belong to the same eNB. Serving cell interaction information neighboring cell
  • Capacity Value IE Capacity Value IE, measurement pilot configuration, etc.
  • Capacity Value IE Capacity Value IE, measurement pilot configuration, etc.
  • the criterion for determining the coordinated cell selection may be: If the serving cell and the measurement cell belong to the same eNB, the measurement cell in this example is the coordinated cell that selects the measurement, and the measurement cell can avoid the same resource allocated by the serving cell.
  • the JP candidate set is preferentially selected, that is, the cooperative transmission point is preferentially selected, and the working mode is determined to be the JP mode; according to the cell antenna configuration, if the serving cell and the measurement cell are both single antenna or virtual single antenna, the JP candidate set is selected; If the serving cell and the measurement cell, that is, the mobile station adjacent to the edge of the coordinated cell, and the resources allocated to the mobile station are the same, and according to the maximum allocation space characteristics of various spatial features, the measurement cell is selected into the CB candidate set, that is, CB Mode operation, the remaining base stations enter the CS candidate set, that is, work in CS mode, and perform interference coordination processing according to R8 mode.
  • Table 4 below shows three cooperative transmission points and their set operation modes determined in the embodiment of the present invention.
  • the cell pilot configuration manner of notifying the entering the coordinated cell may be a channel quality measurement pilot, Then, the pilots of each coordinated cell remain orthogonal or quasi-orthogonal to facilitate measurement, and can be further measured according to system requirements.
  • the further measured information illustratively includes: the UE measures channel information to each coordinated eNB, where the extension is to i users, j base stations, ie
  • N i is the user ID
  • j is the base station identifier
  • the serving base station (eNB1) has one user UE1
  • the coordinated cell with the base station (eNB2) has one interfering user UE2 as an example, and two cells of the serving cell and the coordinated cell cooperate with each other
  • FIG. 4 shows the A schematic diagram of base station cooperation in an example.
  • the serving base station after the channel information is fed back to the serving base station, the serving base station only receives the channel from the serving UE, that is, the eNB1 obtains H11 H21, and the eNB1 obtains the H22 H12, and after the base station interacts to obtain the channel matrix H, the serving base station calculates
  • the coding vector is the cooperative transmission weight W.
  • the zero-forcing method is used according to the following formula, that is, the received interference is forced to zero:
  • W1 is used as the transmission weight of the base station 1 user 1, to achieve cooperation between the base stations.
  • the further measured information illustratively includes: channel information of the UE to each coordinated base station eNB, that is, the UE measures channel information of each coordinated eNB.
  • Hij indicating the channel matrix of the UE-to-cell in the ''cell, ie
  • the serving base station (eNB1) has one user UE1
  • the coordinated cell with the base station (eNB2) has one interfering user UE2 as an example, and two cells of the serving cell and the coordinated cell cooperate with each other, and the mobile station measures
  • the channel is:
  • the cooperative transmission point cell 1 works in JP.
  • the mode, the initialization parameter is the determined cooperative transmission weight W; the cooperative transmission point cell 2 works in the CB mode, and the initialization parameter is the determined cooperative transmission weight W; the cooperative transmission point cell 3 works in the CS mode, and the determination is performed.
  • the coordinated action is to reduce the same power as the serving base station resources and avoid resources.
  • Cell3 CS reduces power, avoids resources
  • the steps from the first step to the fourth step are the same as the first step to the fourth step of the above-described embodiment 1, and the difference is the fifth step.
  • the further measurements of the fifth step include:
  • the serving base station notifies the cooperative base station of the Sounding configured by the cooperative UE through the interaction between the base stations.
  • the cooperative base station initiates interactive channel state information, and calculates and transmits Weight.
  • the weights and the negotiated resources are transmitted according to the measurements shown in Table 5 above.
  • the method for implementing the coordinated multi-point communication provides a method for configuring a cooperative base station cooperation mode according to user measurement, which can implement the working parameters of the coordinated base station and the cooperative base station.
  • FIG. 5 is a schematic diagram of a downlink multipoint cooperative communication process according to an embodiment of the present invention.
  • the serving base station of UE1 is base station 1 (eNB1)
  • the serving base station of UE2 is base station 2 (eNB2)
  • base station 2 is the base station to which the neighboring cell of UE1 belongs
  • base station 1 is the base station to which the neighboring cell of UE2 belongs.
  • the foregoing neighboring cell is a coordinated cell.
  • the process of implementing cooperative communication between the base station 1 and the base station 2 by using the method of the embodiment of the present invention includes:
  • the signal strength measurement of the coordinated cell is triggered, and the measurement is performed.
  • the signal strength of the base station 2 in this example, the measurement of the RSRP of the coordinated cell, further includes measuring the signal strength of the other coordinated cells.
  • the UE1 feeds back the RSRP list of the neighboring cell in the coordinated cell in this example to the base station 1;
  • the base station 1 and the base station 2 perform information exchange, and determine a cooperative relationship and a channel state information pilot (CSI-RS) configuration of the base station; after the cooperative relationship is determined, the base station 1 requests the UE1 to measure the channel quality of the base station 2, where the measurement is performed in this example.
  • CSI-RS channel state information pilot
  • the parameter CSI of the base station 2 after measuring the CSI value of the base station 2, the UE1 feeds back the value to the base station 1.
  • the base station 1 determines the working parameters of the cooperative base station, including: user parameters, and performs cooperative transmission to the UE1 according to the cooperation mode of the base station, CB Mode Base station 1 transmits data to UE1 such that base station 1 has minimal interference to User 2.
  • the signal strength measurement of the coordinated cell is triggered, and the signal strength of the base station 1 is measured.
  • the RSRP of the coordinated cell is measured, and the signal strength of the other coordinated cells is also measured. After the measurement, the UE2 is measured.
  • the measured coordinated cell is fed back to the base station 2 in the RSRP list of the neighboring cell in this example; the base station 1 and the base station 2 perform information exchange, and establish a cooperative relationship and a channel state information pilot (CSI-RS) configuration of the base station; After the relationship is determined, the base station 2 requests the UE2 to measure the channel quality of the base station 1, in this example, the parameter CSI of the base station 1 is measured; after measuring the CSI value of the base station 1, the UE2 feeds back the value to the base station 2, and the base station 2 determines the operating parameters of the cooperative base station. And including: user parameters, and cooperatively transmitting to the UE2 according to the base station cooperation mode, and the CB mode base station 2 transmits data to the UE2, so that the interference of the base station 2 to the user 1 is minimized.
  • CSI-RS channel state information pilot
  • the coordinated cell of the UE1 has only the cell of the base station 2, and the coordinated cell of the UE2 is only the cell of the base station 1.
  • the UE1 and the UE2 may also have other coordinated cells. For other coordinated cells, the measurement process is similar. This will not be repeated here.
  • the embodiment of the present invention further provides a device for selecting a coordinated transmission point, which is used to select a coordinated transmission point in the downlink multi-point cooperative communication.
  • the selection device includes: a serving base station, where the service base station includes:
  • a first processing module configured to receive measurement information of a coordinated cell reported by the mobile station, where the measurement
  • the quantity information is: the information obtained by the mobile station after the measurement of the coordinated cell in the first coordinated cell list of the serving cell, and the second coordinated cell list of the serving cell is established according to the reported measurement information.
  • the coordinated cell in the second coordinated cell list is: a coordinated cell in the first coordinated cell list that has a signal strength greater than a predetermined first threshold;
  • a determining module configured to determine, as the collaborative sending point, the cooperative cell in the second coordinated cell list that meets the preset cooperation condition.
  • the determining module includes:
  • a first determining module configured to determine, when the second coordinated cell list, a first coordinated cell that is the same base station as the serving base station, and determines the first coordinated cell as a coordinated sending point, and determines the The working mode of the first coordinated cell is a joint processing mode.
  • the selecting device wherein the determining module comprises:
  • an interaction module configured to perform information interaction with a base station to which the second coordinated cell belongs when the second coordinated cell list has a second coordinated cell that is different from the serving base station;
  • a second determining module configured to determine, when the information of the interaction indicates that the second coordinated cell meets a preset cooperation condition, the associated second coordinated cell as a coordinated sending point.
  • the selecting device wherein the second determining module is further configured to: when the information of the interaction indicates that the second coordinated cell meets at least one of the following cooperation conditions, the second The coordinated cell is determined to be a collaborative sending point:
  • the load of the second coordinated cell is less than a predetermined second threshold
  • the resources occupied by the second coordinated cell do not conflict with the resources allocated by the serving base station to the mobile station;
  • the measured power of the second coordinated cell is greater than a predetermined power threshold; e.
  • the measured power of the second coordinated cell is a coordinated cell with the strongest or second strongest measured power in the first coordinated cell list.
  • the selecting device wherein the second determining module is further configured to determine an operating mode of the cooperative sending point according to at least one of the following manners:
  • a working mode of the coordinated transmission point where the occupied resource conflicts with the serving cell allocation resource is a cooperative scheduling or a beamforming mode
  • Determining, by the working mode of the coordinated transmission point that the occupied resource does not conflict with the allocated resource of the serving cell, is a joint processing mode
  • the working mode of the cooperative transmission point is determined as a joint processing mode
  • the working mode of the collaborative sending point that fails to meet the user throughput requirement is determined as the joint processing mode
  • the operational mode of the cooperative transmission point whose load is greater than the predetermined third threshold and less than the predetermined fourth threshold is determined as the cooperative scheduling or beamforming mode.
  • the selecting device where the serving base station further includes:
  • a second processing module configured to notify the mobile station to measure channel information of the coordinated transmission point
  • a parameter determining module configured to determine initial working parameters of the coordinated transmission point according to channel measurement information of the coordinated transmission point And transmitting the initial working parameters to the collaborative sending point.
  • the technical solution of the embodiment of the present invention relates to a process of cooperative transmission point selection, a working mode determination, and a parameter initialization method.
  • the measurement result of the coordinated cell in the case of interacting with the base station information, in the second coordinated cell list, selecting a base station transmitting point participating in the cooperation; configuring a cooperation mode of participating the cooperative base station, so that the base station in the second cooperation list can work In the JP mode, it is also possible to work in the CS/CB mode, or not to participate in the collaboration but to maintain the original scheduling mode.
  • the working mode of the cell and the coordinated sending point of the coordinated sending point is not fixed. The invariant, but can be changed according to the actual wireless channel environment, so that the cells work together in a better manner, which is beneficial to improve the user rate and reliability of the cell edge.

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Abstract

本发明公开了一种协作发送点的选择方法和选择装置，包括：步骤A，服务基站接收移动台上报的协作小区的测量信息，测量信息为：移动台对预定的、服务小区的第一协作小区列表中的协作小区进行测量后获得的信息，并根据上报的测量信息建立服务小区的第二协作小区列表，第二协作小区列表中的协作小区为：第一协作小区列表中信号强度大于预定的第一门限值的协作小区；步骤B，服务基站将第二协作小区列表中满足预设协作条件的协作小区确定为服务小区协作发送点。通过本发明，能够解决现有技术未提供协作发送点的具体选择流程的技术问题。

Description

一种协作发送点的选择方法及选择装置 技术领域
本发明涉及数字通信领域， 特别是涉及宽带无线通信系统的演进系统 中的一种协作发送点的选择方法及选择装置。 背景技术
高 级 国 际 移 动 通信 （ IMT-Advanced , International Mobile Telecommunications Advanced )关键技术和概念的研究从 20世纪末 3G技术 完成标准化之时就开始进行， 下一代宽带无线通信代表了信息技术的主要 发展方向， 未来 10到 15年， 无线移动通信市场需求将持续快速增长。 根 据 IMT-Advanced制定的技术需要和目标， IMT-Advanced与现有的系统相 比， 将实现更高的数据率和更大的系统容量， 目标峰值速率为： 低速移动、 热点覆盖场景下 lGbit/s以上， 高速移动、 广域覆盖场景下 100Mbit/s。
引入多点协作（ CoMP, Coordinated Multi-Point )传输的初衷是为了解 决正交频分复用 ( OFDM, Orthogonal Frequency Division Multiplexing ) 系 统中小区间干扰问题， 提高小区边缘移动用户的吞吐量， 如多个演进型基 站（eNB, Evolved Node Base )协作消除子载波间干扰（ICI, InterCarrier Interference ), 甚至将干扰信号变成期望信号。 随着研究的深入， 发现在宽 带无线通讯系统中应用 CoMP,可以提高数据传输速率、小区边缘移动用户 吞吐量、 和系统吞吐量， 成为提高系统频谱利用率的重要技术。 3GPP已经 接受 CoMP为 IMT-Advanced技术之一。
对于小区边缘移动用户， 由于信道衰落， 邻小区干扰等会导致服务质 量（QoS , Quality of Service ), 相比中心用户吞吐率下降。
CoMP是指当 UE处于多个小区边缘时， 由多个小区联合对 UE进行多 点数据传送 /接收， 或通过多个小区间的协调、 调度， 从而达到消除小区间 干扰，提高信号质量和数据吞吐率的目的。在目前 36.814框架描述中， CoMP 分为以下两类：
( 1 )联合处理（JP, Joint processing): 用户数据在每个协作集中的基 站都可以被使用。
( 2 )协作调度 /波束赋形 （CS/CB, Coordinated Scheduling/Coordinated Beamforming): 用户数据仅在服务基站可用。
对协作集进行了以下定义：
CoMP协作小区集： 是网络根据小区的地理分布，设定的一组发送点直 接或间接参与对 UE发生物理下行共享信道（PDSCH, Physical Downlink Shared Channel )。
CoMP测量小区集：用户根据网络要求进行周期或非周期进行测量上才艮 相关的信道状态和统计信息的小区。
服务小区： 向移动台发送物理下行控制信道 （ PDCCH , Physical Downlink Control Channel ) 的小区， 在通讯过程中只有一个服务小区。
根据 CoMP的特点，选入 CoMP集合的小区应具有这样几个特点： CoMP 小区使用相同频带； CoMP小区空中接口的子帧、 符号基本对齐； CoMP集 合内的小区隶属于不同的基站时可以通过 X2接口互联进行消息传递。
现有技术中， 仅仅是根据用户共享情况将基站分为 JP、 CS/CB模式， 大部分将协作集设定为静态或半静态模式， 并没有提供确定下行协作发送 点的具体流程。 发明内容
本发明的目的是提供一种协作发送点的选择方法及选择装置， 以解决 现有技术未提供协作发送点的具体选择流程的技术问题。
为了实现上述目的， 本发明提供了一种协作发送点的选择方法， 用于 在下行多点协作通信中选择协作发送点， 其中， 包括如下步骤：
步骤 A, 服务基站接收移动台上报的协作小区的测量信息， 所述测量 信息为： 所述移动台对预定的、 服务小区的第一协作小区列表中的协作小 区进行测量后获得的信息， 并根据所述上报的测量信息建立服务小区的第 二协作小区列表， 所述第二协作小区列表中的协作小区为： 所述第一协作 小区列表中、 信号强度大于预定的第一门限值的协作小区；
步骤 B, 所述服务基站将所述第二协作小区列表中满足预设协作条件 的协作小区确定为所述服务小区协作发送点。
优选地， 所述的选择方法， 其中， 所述步骤 A中， 所述移动台对所述 第一协作小区列表中的协作小区进行的测量是： 在所述移动台移动至服务 小区的边缘或服务小区的服务质量不能满足预定的用户需求时， 由所述服 务基站或由所述移动台自身触发的测量。
优选地， 所述的选择方法， 其中， 所述步骤 B中， 当所述第二协作小 区列表存在所属基站与所述服务基站是同一基站的第一协作小区时， 将所 述第一协作小区确定为协作发送点， 并确定所述第一协作小区的工作模式 为联合处理模式。
优选地， 所述的选择方法， 其中， 所述步骤 B中， 当所述第二协作小 区列表存在所属基站与所述服务基站不相同的第二协作小区时， 还包括： 所述服务基站与所述第二协作小区所属的基站进行信息交互， 并当所 述交互的信息表明所述第二协作小区满足预设的协作条件时， 将所述第二 协作小区确定为协作发送点。
优选地， 所述的选择方法， 其中， 当所述交互的信息表明所述第二协 作小区满足如下协作条件中的至少一项时， 将所述第二协作小区确定为协 作发送点：
a, 所述第二协作小区的负载小于预定的第二门限值； b , 所述第二协作小区占用的资源与所述服务基站分配给所述移动台的 资源不冲突；
C , 所述第二协作小区的负载大于预定的第三门限值并小于预定的第四 门限值；
d, 所述第二协作小区的测量功率大于预定的功率阔值；
e, 所述第二协作小区的测量功率为所述第二协作小区列表中测量功率 最强或次强的协作小区。
优选地， 所述的选择方法， 其中， 所述步骤 B中， 对于所属基站与所 述服务基站不同的协作发送点， 还包括如下步骤中的至少一项：
将占用的资源与所述服务小区分配资源冲突的协作发送点的工作模式 确定为协作调度或波束赋形模式；
当协作发送点和服务小区都是单天线或虚拟单天线时， 将所述协作发 送点的工作模式确定为联合处理模式；
将无法满足用户吞吐率的需求服务基站的协作发送点的工作模式确定 为联合处理模式；
将负载大于预定的第三门限值并小于预定的第四门限值的协作发送点 的工作模式确定为协作调度或波束赋形模式。
优选地， 所述的选择方法， 其中， 在所述步骤 B之后， 还包括： 所述服务基站通知所述移动台测量所述协作发送点的信道信息； 所述服务基站根据所述协作发送点的信道测量信息， 确定出所述协作 发送点的初始工作参数， 并将所述初始工作参数发送至所述协作发送点。
优选地， 所述的选择方法， 其中， 所述协作发送点的信道信息由所述 协作发送点根据所述移动台发送的侦测信号， 通过所述协作发送点测量得 到。
另一方面， 提供一种协作发送点的选择装置， 用于在下行多点协作通 信中选择协作发送点， 其中， 包括： 服务基站，
所述服务基站包括：
第一处理模块， 用于接收移动台上报的协作小区的测量信息， 所述测 量信息为： 所述移动台对预定的、 服务小区的第一协作小区列表中的协作 小区进行测量后获得的信息， 并根据所述上报的测量信息建立服务小区的 第二协作小区列表， 所述第二协作小区列表中的协作小区为： 所述第一协 作小区列表中、 信号强度大于预定的第一门限值的协作小区；
确定模块， 用于将所述第二协作小区列表中满足预设协作条件的协作 小区确定为协作发送点。
优选地， 所述的选择装置， 其中， 所述确定模块包括：
第一确定模块， 用于当所述第二协作小区列表存在所属基站与所述服 务基站是同一基站的第一协作小区时， 将所述第一协作小区确定为协作发 送点， 并确定所述第一协作小区的工作模式为联合处理模式。
优选地， 所述的选择装置， 其中， 所述确定模块包括：
交互模块， 用于当所述第二协作小区列表存在所属基站与所述服务基 站不相同的第二协作小区时， 与所述第二协作小区所属的基站进行信息交 互；
第二确定模块， 用于当所述交互的信息表明所述第二协作小区满足预 设的协作条件时， 将所属第二协作小区确定为协作发送点。
优选地， 所述的选择装置， 其中， 所述第二确定模块， 进一步用于当 所述交互的信息表明所述第二协作小区满足如下协作条件中的至少一项 时， 将所述第二协作小区确定为协作发送点：
a, 所述第二协作小区的负载小于预定的第二门限值；
b , 所述第二协作小区占用的资源与所述服务基站分配给所述移动台的 资源不冲突； C , 所述第二协作小区的负载大于预定的第三门限值并小于预定的第四 门限值；
d, 所述第二协作小区的测量功率大于预定的功率阔值；
e , 所述第二协作小区的测量功率为所述第一协作小区列表中测量功率 最强或次强的协作小区。
优选地， 所述的选择装置， 其中， 所述第二确定模块， 进一步用于按 照如下方式中的至少一种确定协作发送点的工作模式：
将占用的资源与所述服务小区分配资源冲突的协作发送点的工作模式 确定为协作调度或波束赋形模式；
将占用的资源与所述服务小区分配资源不冲突的协作发送点的工作模 式确定为联合处理模式；
当协作发送点和服务小区都是单天线或虚拟单天线时， 将所述协作发 送点的工作模式确定为联合处理模式；
将无法满足用户吞吐率的需求的服务基站的协作发送点的工作模式确 定为联合处理模式；
将负载大于预定的第三门限值并小于预定的第四门限值的协作发送点 的工作模式确定为协作调度或波束赋形模式。
优选地， 所述的选择装置， 其中， 所述服务基站还包括：
第二处理模块， 用于通知所述移动台测量所述协作发送点的信道信息； 参数确定模块， 用于根据所述协作发送点的信道测量信息， 确定出所 述协作发送点的初始工作参数， 并将所述初始工作参数发送至所述协作发 送点。
本发明的技术效果在于：
服务基站接收移动台上报的协作小区的测量信息， 所述测量信息为： 所述移动台对预定的、 服务小区的第一协作小区列表中的协作小区进行测 量后获得的信息， 并根据所述上报的测量信息建立服务小区的第二协作小 区列表， 并将所述第二协作小区列表中、 满足预设协作条件的协作小区确 定为协作发送点， 提供了一种由正常工作模式进入下行多点协作模式的多 点协作实现方式， 使得位于小区边缘的移动台能获得更好的服务质量和用 户吞吐率。 附图说明 图 1为本发明一实施例的协作发送点的选择方法的流程示意图； 图 2为本发明另一实施例的协作发送点的选择方法的流程示意图； 图 3为本发明一实施例中， 触发协作测量选择的功率范围示意图； 图 4为本发明一实施例中基站协作的示意图；
图 5为本发明一实施例的下行多点协作基站间交互及实施过程示意图； 图 6为本发明一实施例的协作发送点的选择装置的结构示意图。 具体实施方式 为使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图及具 体实施例对本发明进行详细描述。
图 1为本发明实施例的协作发送点的选择方法的流程示意图。 如图 1 , 该实施例的实现多点协作通信的方法包括如下步骤：
步骤 101 ,服务基站根据移动台上报的协作小区的测量信息， 建立第二 协作小区列表。
服务基站接收移动台上报的协作小区的测量信息， 所述测量信息为： 所述移动台对预定的、 服务小区的第一协作小区列表中的协作小区进行测 量后获得的信息， 并根据所述上报的测量信息建立服务小区的第二协作小 区列表， 所述第二协作小区列表中的协作小区为： 所述第一协作小区列表 中信号强度大于预定的第一门限值的协作小区。 示例性地， 该步骤 101 中， 所述移动台上 的协作小区测量信息为： 所述第一协作小区列表中信号强度大于预定的第一门限值的协作小区的信 号强度测量信息， 或所述第一协作小区列表中所有协作小区的测量信息。 对于前一种情况， 信号强度大于预定的第一门限值的协作小区由移动台选 出， 并将协作小区的测量信息上报给服务基站； 对于第二种情况， 信号强 度大于预定的第一门限值的协作小区由服务基站根据移动台上报的测量信 息进行选择。
示例性地， 上述第一协作小区列表可由系统、 如服务基站根据周围小 区的地理位置预先设置。 进一步地， 上述第一协作小区列表可为静态或半 静态的， 并可以由服务基站通过广播消息或控制消息通知服务小区的移动 台 UE。
示例性地， 上述步骤 101 中， 所述移动台对预定的第一协作小区列表 中的协作小区进行的测量是： 在所述移动台移动至服务小区的边缘或服务 小区的服务质量不能满足预定的用户需求时， 由所述服务基站或由所述移 动台自身触发的测量； 示例性地， 上述服务质量是否满足预定的用户需求 可通过服务质量值即 QoS值或误码率的值与对应门限值的比对来确定； 步骤 102,所述服务基站将所述第二协作小区列表中满足预设协作条件 的协作小区确定为服务小区的协作发送点。
所述步骤 102 中， 当所述第二协作小区列表存在所属基站与所述服务 基站是同一基站的第一协作小区时， 将所述第一协作小区确定为协作发送 点， 并确定所述第一协作小区的工作模式为联合处理模式。
优选地， 步骤 102 中， 当所述第二协作小区列表存在所属基站与所述 服务基站不相同的第二协作小区时， 还包括： 所述服务基站与所述第二协 作小区所属的基站进行信息交互， 并当所述交互的信息表明所述第二协作 小区满足预设的协作条件时， 将所属第二协作小区确定为协作发送点。 该 步骤中， 示例性地， 服务基站和协作小区所属的基站之间通过 X2接口交互 信息。 示例性地， 上述服务基站和协作小区所属的基站即协作基站之间交 互的信息可以^^站负载信息、 资源占用信息、 和 /或功率分配信息等。 示 例性地， 当所述交互的信息表明所述第二协作小区所属的基站的负载、 所 占用的资源、 和 /或测量功率满足预定协作条件时， 将所述第二协作小区确 定为协作发送点。 示例性地， 当所述交互的信息表明所述第二协作小区满 足如下协作条件中的至少一项时， 将所述第二协作小区确定为协作发送点： a, 所述第二协作小区的负载小于预定的第二门限值；
b , 所述第二协作小区占用的资源与所述服务基站分配给所述移动台的 资源不冲突；
c 所述第二协作小区的负载大于预定的第三门限值并小于预定的第四 门限值；
d, 所述第二协作小区的测量功率大于预定的功率阔值；
e, 所述第二协作小区的测量功率为所述第一协作小区列表中测量功率 最强或次强的协作小区。
在本发明实施例的下行多点协作通信中选择协作发送点方法的实现 中， 第一协作小区列表中的协作小区所属基站的地理位置与服务基站的地 理位置不同的情况下， 要求第一协作小区列表的协作小区所属的基站工作 在与服务基站相同的频带、 且同步。
示例性地， 本发明的实施例的上述步骤 101 中， 当满足如下条件的至 少一个时， 确定出所述移动台移动至服务小区的边缘：
条件 1 , 所述服务小区的如下参数中的至少一项低于对应的第五门限 值：参考信号接收功率 RSRP、参考信号接收质量 RSRQ、信噪功率比 SNR、 信干噪声功率比 SINR;
条件 2 ,所述第一协作小区列表中的至少一个协作小区的如下参数中的 至少一项高于对应的第六门限值： 参考信号接收功率、 参考信号接收质量、 信噪功率比、 信干噪声功率比。
具体实现中，协作小区测量的触发机制可以是在 UE周期测量本小区的 RSRP、 RSRQ、 SINR、 SNR小于预定的门限时， 触发协作小区测量。
示例性地， 可以通过 RRC测量配置 IE要求移动至小区边缘的用户进 行协作小区测量，要求的测量的信号强度信息可以是 RSRP、 RSRQ、 RSSI, SINR,SNR等； 也可以根据邻小区列表的测量结果， 选择符合协作小区列表 要求的小区， 更新协作小区测量信息。
优选地， 移动台根据无线资源控制器 RRC ( Radio Resource Control ) 测量配置信息单元（IE, Information element )要求进行协作小区测量， 测 量结果由移动台选择上报或全部上报。 选择上报的条件可以是按功率大小 排列的所有协作邻区信息中具有最强接收功率、 次强接收功率的协作小区， 或超过预定门限的协作邻区的测量值。
示例性地， 移动台可以根据系统配置消息， 在周期测量服务小区信道 质量接近小区边缘时， 自动发起协作小区测量。
示例性地， 服务小区根据移动至小区边缘的移动台或服务质量未满足 预定用户需求的移动台的测量信息建立第二协作 d、区列表即移动台候选协 作小区发送点列表。 其中， 上报协作小区测量信息的移动台可以是一个或 地理位置几乎相同的一组移动台。
优选地， 本发明实施例方法的步骤 102 中， 对于所属基站与所述服务 基站不同的协作发送点， 还包括如下步骤中的至少一项：
将占用的资源与所述服务小区分配资源冲突的协作发送点的工作模式 确定为协作调度或波束赋形模式；
将占用的资源与所述服务小区分配资源不冲突的协作发送点的工作模 式确定为联合处理模式； 当协作发送点和服务小区都是单天线或虚拟单天线时， 将所述协作发 送点的工作模式确定为联合处理模式；
将无法满足用户吞吐率的需求的协作发送点的工作模式确定为联合处 理模式；
将负载大于预定的第三门限值并小于预定的第四门限值的协作发送点 的工作模式确定为协作调度或波束赋形模式。
优选地， 协作发送点和协作发送点的工作模式确定后， 通常根据工作 模式的不同要求进行进一步辅助测量。
进一步地， 服务基站和协作小区所属的基站进行信息交互后， 还可确 定协作发送点的测量导频配置及发送模式、发送周期， 和 /或移动台发送的、 或用于通知协作小区所属基站进行辅助测量的特定的侦测（ Sounding M言号， 这些信息可用于对协作发送点的信道进行进一步辅助测量。
本发明实施例提供了一种由正常工作模式进入多点协作模式的多点协 作实现方式； 利用本发明实施例的技术方案， 使得位于小区边缘的移动台 可以获得更好的服务质量（QoS, Quality of Service )和用户吞吐率。 进一 步地， 由于本发明的实施例中， 协作发送点的小区及协作发送点的工作模 式不是固定不变的， 而是可根据实际的无线信道环境变化的， 从而可使小 区以较优的方式协同工作， 有利于提高小区边缘的用户速率和可靠性。
本发明实施例的方法， 在确定出协作发送点之后， 优选地， 在确定出 协作发送点及协作工作点的工作模式之后， 还包括：
步骤 103 ,所述服务基站通知所述移动台测量所述协作发送点的信道信 息， 该信道测量为辅助的测量； 示例性地， 测量的信道信息包括如下测量 参数中的至少一项： 协作小区的信道矩阵、 信道的协方差、 干扰强度、 干 扰波束指向等。
其中， 协作发送点的信道信息由所述协作发送点根据所述移动台发送 的侦测信号， 通过所述协作发送点测量得到。
步骤 104, 所述服务基站根据所述协作发送点的信道测量信息， 确定出 所述协作发送点的初始工作参数， 并将所述初始工作参数发送至所述协作 发送点。
利用上述辅助测量的测量结果， 可以根据协作小区的工作模式反馈不 同的信道状态。
优选地， 服务基站还可以配置协作小区的测量导频， 由移动台进行协 作发送点的信道测量。 示例性地， 测量导频在服务基站的小区和协作基站 的小区保持正交， 由移动台测量信道信息， 并反馈到服务基站， 用于对下 行协作权值进行调整。
优选地，服务基站还可以要求移动台发送特定的侦测信号（ Sounding ), 以由协作小区所属的基站进行协作发送点的信道测量。 示例性地， 该侦测 信号可由服务基站预先配置好后， 通知移动台， 由移动台发送。 示例性地， 协作发送点的信道信息由所述协作发送点根据所述移动台发送的侦测信号 后， 通过协作小区的测量移动台的 Sounding得到。 其中， 移动台发送所述 预定的侦测信号至所述协作发送点所属的基站， 协作小区所属的基站即协 作基站根据移动台发送的 Sounding信号进行协作发送点信道测量， 可获得 协作小区的上行信道矩阵等信道参数， 该获得的上行信道矩阵等信道参数 可用于对下行协作权值进行调整。 协作基站将所述协作发送点的信道信息 发送至所述服务基站； 所述服务基站根据所述协作发送点的信道信息确定 出所述协作发送点的初始工作参数， 并将所述初始工作参数发送至所述协 作发送点。 上述初始工作参数示例性地， 包括协作基站的发送权值。
服务基站根据上述辅助测量的结果， 选择协作基站， 进行与协作基站 之间的信息交互， 确定协作发送点的初始工作参数， 并按照协作要求进行 发送， 然后协作发送点间按照确定的初始工作参数可开始协同工作。 示例 性的， 对于工作模式为 JP模式的协作发送点， 确定的初始工作参数包括： 资源调度、 协作小区所属基站即协作基站的发送权值、 和 /或协作移动台的 数据； 对于工作模式为 CS/CB模式的协作发送点， 确定的初始工作参数包 括： 资源调度、 和 /或协作基站的发送权值。
本发明实施例的技术方案， 进行了多小区优化， 通过多选工作模式不 仅降低了系统级干扰， 还可进一步提高小区边缘的用户速率和可靠性。
本发明实施例的具体实现中， 要求移动台工作在无线资源控制器 RRC 的连接状态， 并移动到小区边缘， 协作小区工作在相同频带， 小区间保持 同步。
下面对本发明实施例的 CoMP工作方式进行举例说明。
本发明实施例的 CoMP 系统中， 在协作区域内配置协作小区工作模式 的方法如图 2所示， 主要包括四个步骤：
步骤 201 ,移动台根据系统即服务基站配置测量方式及测量内容进行协 作小区测量并上报测量信息；
步骤 202, 基站间的信息交互， 确定协作发送点；
步骤 203 , 通知协作基站进行进一步辅助测量；
步骤 204, 确定协作发送点的协作模式和工作参数。
其中， 当协作小区所属的基站与服务基站是同一个 eNB时， 无需在基 站间进行信息交互。
其中， 对于测量过程， 现有 R8版本的测量中， LTE中连接状态测量过 程包括： E-UTRAN发送 RRC的重配置 IE, 该重配置 IE包括： 测量 ID和 类型、 测量对象、 测量数量、 测量上报数量、 上报判据等； UE根据收到 RRC发送的测量配置 IE要求进行测量，根据测量上报标准判断是否需要上 报。
本发明实施例的 LTE中的协作小区测量过程中，主要测量的内容包括： 参考信号接收功率（RSRP, Reference Signal Received Power ), 参考信号 接收质量（RSRQ, Reference Signal Received Quality), 接收信号强度指示 ( RSSI, Receiver Signal Strength Indicator),其中 RSRQ=N x RSRP/(E-UTRA RSSI) , 其中 E-UTRA ( Evolved Universal Terrestrial Radio Access Network carrier ) 为载波。
本发明实施例的 LTE中触发的协作小区测量过程的一个示例包括如下 步骤 , 该例中 , 以测量 RSRP为例：
步骤一， 检测服务小区的 RSRP< I触发协作小区测量， I为服务小区 预先配置的门限；
步骤二， E-UTRAN发送 RRC重配消息， 配置测量信息单元（ IE ); 步骤三， 移动台在测量时隙到通知下行物理层（ DLPHY )根据测量配 置 IE的配置发起对相邻小区的测量；
步骤四， 移动台进行测量结果判别及上 ^艮移动台的 RRC消息； 步骤五， 移动台 RRC 将测量结果封装成 RRC 消息上报给服务基站 eNB。
该例中， 与 R8版本不同的地方在于： 选择测量的不是部小区列表而是 协作小区列表； 该例中， 通过现有技术的 R8周期测量的是 RSRP等用于触 发协作小区测量的信息。 如果是同频同步网络， 可以认为邻小区列表和协 作小区列表相同， 协作小区列表可以和邻小区列表有部分重合， 当有重合 时， 可以根据邻小区测量结果更新测量结果， 减少协作小区测量数量,通过 配置 RRC IE指出没有与邻小区重合的协作小区测量。
该例中的， 触发协作小区测量的条件， 可以是服务小区的 RSRP和 /或 RSRQ低于配置门限或作为协作小区的邻小区的 RSRP和 /或 RSRQ高于一 定门限。
对于 CoMP , 基站之间通过 X2接口交互的信息包括 R8版本现有的信 息和协作基站新增的交换 IE。 其中， R8版本现有的信息包括： 相对窄带发 送功率指示 （ Relative Narrowband Tx Power, RNTP) IE , 用于指示每个物 理资源块（PRB ) 的发射功率是否低于 RNTP 的门限； 负载指示信息单元 ( Load Indicator Information Element ), 用于指示负载状态； 无线资源状态 信息单元（ Radio Resource Status IE ), 用于指示上行和下行 PRB的使用情 况； 容量值信息单元（ Capacity Value IE ), 用于指示 E-UTRAN所有资源中 可以使用资源的数目。
本发明实施例中， 协作基站新增加的交互信息包括：
移动台数据信息单元（UE data IE ), 用于指示协作基站交互协作 UE 的数据， 以共同调度提高 UE的吞吐率， 可靠性， 在 JP模式下使用；
移动台资源信息单元（ UE Resource IE ), 用于指示服务基站对协作 UE 的资源占用情况， 使协作基站根据自身负载情况决定釆用 JP 方式还是 CS/CB方式；
移动台信道状态信息（UE CSI IE ),用于指示协作基站交互的信道测量 数据， 以用于计算协作基站的发送权值。
本发明实施例中，服务基站可以根据协作基站测量结果和 X2接口的交 互结果进一步辅助测量。 在具体实现中， 可选择进入协作发送点列表中的 小区信号强度大的基站， 根据初步确定的协作模式进行下一步测量； 示例 性的， 各协作基站通过配置协作小区的测量导频进行辅助测量， 也可以由 配置 UE的特定 sounding由协作小区进行测量， 测量内容可以是信道矩阵、 信道的协方差、 干扰强度、 和 /或干扰波束指向； 其中， 测量的内容可根据 协作基站工作模式、 协作的配置模式而不同。
本发明的实施例中， 在进行协作发送点的工作模式配置和协作发送点 的初始工作参数配置时， 服务基站根据上述辅助测量的结果和协作调度的 结果， 优先选择与服务基站同站点的协作基站进行 JP协作， 其它非同站点 的协作基站作为 CS/CB调度， 这样可减少基站间的 X2接口的交互量。 具 体实现中， 示例性地， 服务基站根据 X2接口的交互结果优先选择负载轻的 协作基站进行协作； 优先选择干扰强的基站进行协作； 根据用户调度的数 据緩存（buffer )和服务质量（Qos )选择协作模式； 根据进一步信道测量 结果， 选择协作基站作为 JP协作基站， 并通过基站间接口交互协作数据、 协作工作参数及进行协作调度。 根据进一步信道测量结果， 选择协作基站 作为 CS/CB协作基站， 通过基站间的接口进行协作调度， 交互协作工作参 数。
个具体的例子对本发 W
实施例 1
第一步
目标服务小区所属的基站 ( eNB )通过下行控制信道向移动台发送测试 命令， 要求移动台按要求对配置的小区进行测量， 示例性地， 该配置的小 区为预先配置的第一协作小区列表中的小区。 测量的内容包括： RSRP、 RSRQ等。 如图 3 , 该例中， 当服务小区 cellO的 RSRP位于 10dB到 -10dB 之间时， 确定出 cellO移动至小区边缘， 并启动协作小区的周期测量。 以服 务小区 cellO的 RSRP=10dB为例， cellO移动至小区边缘， 启动协作小区的 周期测量。 图 3所示起到协作小区 RSRP测量的功率范围时示例性地， 并 不用于作为对本发明的限制。 触发协作小区测量的 RSRP 范围可有多种变 化， 其范围选取依赖于小区的应用场景， 如宏小区、 小区、 微小区等。 该例中， 测得作为协作小区的邻小区的信号强度如下表 1所示。
小区标识 RSRP
Celll -3dB
Cell2 -5dB
Cell3 -7dB
Cell4 -15dB Cel -20dB
Cell6 -25dB
表 1
第二步
移动台根据第一步的测量结果选择符合条件的小区结果进行上报。 该 步骤中， 上报判决准则可以是： 邻小区的导频信号强度条件满足小于服务 小区导频信号强度大于设定的门限， 示例性地， 可设定门限值为： （协作小 区参考符号的接收功率 -服务小区参考符号的接收功率） |dB <参考符号的 接收功率的门限阔值、 (协作小区参考符号的接收质量 -服务小区参考符 号的接收质量） |(©<参考符号的接收质量的门限阔值， 设定的门限可以根据 移动台的业务需求和系统负载情况由服务基站配置， 或根据测量邻小区的 RSRP值直接选择。 该例中， cell 4和 cell5的测量结果不符号上报条件， 不 上报， 上报的小区 1 ( cell 1 )、 小区 2 ( cell 2 )、 小区 3 ( cell 3 )的测量结果 具体如下表 2所示：
Figure imgf000019_0001
表 2
第三步
如果测量小区和服务小区属于同一个 eNB , 则转向第四步； 否则， 启 动 X2接口在测量小区即协作小区所属的基站与服务基站之间交换信息，具 体交互的信息参见下表 3所示。该例中，设置 celll和 cellO属于同一个 eNB。 服务小区 交互信息 邻小区
CellO Celll
RNTP、 Load Indicator IE、 Radio Resource Status IE、
CellO Cell2
Capacity Value IE, 测量导频配置等
RNTP、 Load Indicator IE、 Radio Resource Status IE、
CellO Cell3
Capacity Value IE, 测量导频配置等
表 3
第四步
协作小区选择
该例中， 协作小区选择的判别准则可以是： 如果服务小区和测量小区 属于同一个 eNB, 该例中测量小区即为选择测量的协作小区， 测量小区可 以避开与服务小区分配的相同的资源则优先选入 JP候选集， 即优先选为协 作发送点， 并确定其工作模式为 JP模式； 根据小区天线配置， 如果服务小 区和测量小区都是单天线或虚拟单天线选入 JP候选集； 如果服务小区和测 量小区即协作小区临近边缘的移动台， 且对移动台分配的资源相同， 并按 各种的空间特征最大的分配空间特性， 则该测量小区选入 CB候选集， 即以 CB模式工作， 其余基站入 CS候选集， 即以 CS模式工作， 按 R8模式进行 干扰协调处理。 下表 4, 示出了本发明实施例中确定出的三个协作发送点及 其设定的工作模式。
Figure imgf000020_0001
表 4
第五步 进一步测量
通知进入协作小区的小区导频配置方式可以为信道质量测量导频， 原 则上各个协作小区导频保持正交或准正交， 以方便测量， 可以按系统要求 进一步测量。
对于 JP方式的协作发送点， 进一步测量的信息示例性地包括： UE测 量到各个协作 eNB的信道信息 ¾j, 这里表示扩展到 i个用户， j个基站， 即
Η..,/=1,2,···, _/ = l2 -" N i为用户标识， j为基站标识， 写成信道矩 阵 H为：
Figure imgf000021_0001
该例中 以服务基站（ eNBl )有一个用户 UE1 , 所属基站为 （ eNB2 ) 的协作小区有一个干扰用户 UE2为例， 相互协作的有服务小区和协作小区 两个小区， 图 4示出了该例中基站协作的示意图。
该例中， 该信道信息反馈到服务基站后， 由于服务基站仅由其服务 UE 反馈信道， 即 eNBl得到 Hll H21, eNBl得到 H22 H12, 通过基站交互， 得到信道矩阵 H后， 由服务基站计算予编码矢量即协作发送权值 W, 示例 性地， 按如下公式釆用迫零法计算， 即让接收的干扰强制为零：
W = HFF (HHFF +σ2Ι) ,
则 W _7· = l2 N即为第 ·个eNB的预编码矩阵。 将 W _/ = 12 N交互 到邻小区， 其中 σ2是噪声方差， ί"表示共轭转置， I是单位阵。 这里仅有 两个小区 cellO 的权值为 Wl, celll的权值为 W2, 将 W2交互给基站 2, 作为基站 2用户 2的发送权值， W1作为基站 1用户 1的发送权值， 实现基 站间的协作。
对于 CB方式的协作发送点， 进一步测量的信息示例性地包括： UE到 各个协作基站 eNB的信道信息， 即： UE测量到各个协作 eNB的信道信息 Hij, 表示第' '小区中的 UE对 小区的信道矩阵， 即
H ,/=1,2,···, j = \,2,''、N、 i为用户标识， j为基站标识，写成矩阵为
Figure imgf000022_0001
示例性地， 以服务基站（ eNBl )有一个用户 UE1 , 所属基站为（ eNB2 ) 的协作小区有一个干扰用户 UE2为例， 相互协作的有服务小区和协作小区 两个小区， 这时移动台测量的信道为：
Η.., = 1,2,···, j = l,2, ,Ν
表示第 i小区中的 UE对第」小区的信道矩阵。
计算第' '小区中的 UE对 · 小区的信道相关矩阵，
Figure imgf000022_0002
移动台反 馈 = 到服务基站， 在基站间交互 = H 。
对于 CB按照最大 SLR (信漏比） 准则， 即使接收的有用信号功率和 泄漏给其它配对 UE的功率比值最大， 第 _ = l,2,...,N小区的预编码矩阵为：
W; = eig 其中 eg{R}表示求 R的前 m大个特征值所对应的特征矢量， m】表示第 j 个小区中的 UE所使用的层数。 a是噪声方差， H"表示共轭转置， I是单位 阵， 根据表 5中所示的测量得到的权值和协商后的资源进行发送。 该例中， 协作发送点 cell 1工作在 JP模式， 其初始化参数为确定出的协作发送权值 W; 协作发送点 cell 2工作在 CB模式， 其初始化参数为确定出的协作发送 权值 W; 协作发送点 cell 3工作在 CS模式， 其确定的协调动作是降低与服 务基站资源相同的功率， 避让资源。
工作模式 初始化参数 Celll JP Wl
Cell2 CB W2
Cell3 CS 降低功率， 避让资源
表 5
实施例 2
该实施例 2中， 第一步至第四步的步骤与上述实施例 1的第一步至第 四步相同， 不同的是第五步。
该例中， 第五步的进一步测量包括：
服务基站将协作 UE所配置的 Sounding通过基站间的交互通知协作基 站。
各个协作基站测量 UE 的 Sounding,得到各个协作基站的信道信息 Η.., = 1,2,···, j = \, 2, · · · , Ν . 协作基站启动交互信道状态信息， 计算发送权值。
根据上表 5中所示的测量得到的权值和协商后的资源进行发送。
本发明实施例的实现多点协作通信的方法， 提供了一种根据用户测量 配置协作集中基站协作模式的方法， 可以实现合理配置协作集的协作基站、 及协作基站的工作参数。
本发明的技术方案在协作小区数目越多的情况下优势越明显。
图 5给出了本发明一实施例的下行多点协作通信过程示意图。 如图 5 , 该例中， 假定 UE1的服务基站为基站 1 ( eNBl ), UE2的服务基站为基站 2 ( eNB2 ), 基站 2作为 UE1的邻小区所属基站， 基站 1作为 UE2的邻小区 所属基站， 该例中上述邻小区为协作小区。 利用本发明实施例的方法实现 基站 1与基站 2协作通信的过程包括：
对于 UE1 :
当 UE1移动到基站 1的边缘时， 触发协作小区的信号强度测量， 测量 基站 2的信号强度， 该例中为测量协作小区的 RSRP, 则还包括测量其它协 作小区的信号强度， 测量后， UE1 将测量的协作小区该例中为邻小区的 RSRP列表反馈至基站 1 ; 基站 1与基站 2之间进行信息交互， 并确定协作 关系及基站的信道状态信息导频（CSI-RS )配置； 协作关系确定后， 基站 1 要求 UE1测量基站 2的信道质量， 该例中测量基站 2的参数 CSI; UE1测 量基站 2的 CSI值后，将该值反馈至基站 1 ,基站 1确定协作基站的工作参 数， 包括： 用户参数， 并根据基站的协作模式向 UE1进行协作发送， CB 方 式基站 1向 UE1发送数据， 使得基站 1对用户 2的干扰最小。
对于 UE2:
当 UE2移动到基站 2的边缘时， 触发协作小区的信号强度测量， 测量 基站 1的信号强度， 该例中为测量协作小区的 RSRP, 则还包括测量其它协 作小区的信号强度， 测量后， UE2 将测量的协作小区该例中为邻小区的 RSRP列表反馈至基站 2; 基站 1与基站 2之间进行信息交互， 并确立协作 关系及基站的信道状态信息导频（CSI-RS )配置； 协作关系确定后， 基站 2 要求 UE2测量基站 1的信道质量， 该例中测量基站 1的参数 CSI; UE2测 量基站 1的 CSI值后，将该值反馈至基站 2,基站 2确定协作基站的工作参 数， 包括： 用户参数， 并根据基站协作模式向 UE2进行协作发送， CB 方 式基站 2向 UE2发送数据， 使得基站 2对用户 1的干扰最小。
该例中， 以 UE1的协作小区只有基站 2的小区、 UE2的协作小区只有 基站 1的小区为例， UE1和 UE2还可以具有其它的协作小区， 对于其它的 协作小区， 测量的过程类似， 在此不再赘述。
本发明实施例还提供了一种协作发送点的选择装置， 用于在下行多点 协作通信中选择协作发送点， 如图 6该选择装置包括： 服务基站， 所述服 务基站包括：
第一处理模块， 用于接收移动台上报的协作小区的测量信息， 所述测 量信息为： 所述移动台对预定的、 服务小区的第一协作小区列表中的协作 小区进行测量后获得的信息， 并根据所述上报的测量信息建立服务小区的 第二协作小区列表， 所述第二协作小区列表中的协作小区为： 所述第一协 作小区列表中、 信号强度大于预定的第一门限值的协作小区；
确定模块， 用于将所述第二协作小区列表中、 满足预设协作条件的协 作小区确定为协作发送点。
优选地， 所述的选择装置中， 所述确定模块包括：
第一确定模块， 用于当所述第二协作小区列表存在所属基站与所述服 务基站是同一基站的第一协作小区时， 将所述第一协作小区确定为协作发 送点， 并确定所述第一协作小区的工作模式为联合处理模式。
优选地， 所述的选择装置， 其中， 所述确定模块包括：
交互模块， 用于当所述第二协作小区列表存在所属基站与所述服务基 站不相同的第二协作小区时， 与所述第二协作小区所属的基站进行信息交 互；
第二确定模块， 用于当所述交互的信息表明所述第二协作小区满足预 设的协作条件时， 将所属第二协作小区确定为协作发送点。
优选地， 所述的选择装置， 其中， 所述第二确定模块， 进一步用于当 所述交互的信息表明所述第二协作小区满足如下协作条件中的至少一项 时， 将所述第二协作小区确定为协作发送点：
a, 所述第二协作小区的负载小于预定的第二门限值；
b , 所述第二协作小区占用的资源与所述服务基站分配给所述移动台的 资源不冲突；
c 所述第二协作小区的负载大于预定的第三门限值并小于预定的第四 门限值；
d, 所述第二协作小区的测量功率大于预定的功率阔值； e, 所述第二协作小区的测量功率为所述第一协作小区列表中测量功率 最强或次强的协作小区。
优选地， 所述的选择装置， 其中， 所述第二确定模块， 进一步用于按 照如下方式中的至少一种确定协作发送点的工作模式：
将占用的资源与所述服务小区分配资源冲突的协作发送点的工作模式 确定为协作调度或波束赋形模式；
将占用的资源与所述服务小区分配资源不冲突的协作发送点的工作模 式确定为联合处理模式；
当协作发送点和服务小区都是单天线或虚拟单天线时， 将所述协作发 送点的工作模式确定为联合处理模式；
将无法满足用户吞吐率的需求的协作发送点的工作模式确定为联合处 理模式；
将负载大于预定的第三门限值并小于预定的第四门限值的协作发送点 的工作模式确定为协作调度或波束赋形模式。
优选地， 所述的选择装置， 其中， 所述服务基站还包括：
第二处理模块， 用于通知所述移动台测量所述协作发送点的信道信息； 参数确定模块， 用于根据所述协作发送点的信道测量信息， 确定出所 述协作发送点的初始工作参数， 并将所述初始工作参数发送至所述协作发 送点。
本发明实施例的技术方案涉及协作发送点选择的过程、 工作模式确定 及参数初始化的方法。 根据协作小区的测量结果， 和基站信息交互的情况， 在第二协作小区列表中， 选择参与协作的基站发送点； 配置参与协作基站 的协作方式， 使第二协作列表的中的基站即可以工作在 JP方式， 也可以工 作在 CS/CB方式， 或者不参与协作而是保持原来的调度方式。 利用本发明 实施例的技术方案， 协作发送点的小区及协作发送点的工作模式不是固定 不变的， 而是可根据实际的无线信道环境变化的， 从而可使小区以较优的 方式协同工作， 有利于提高小区边缘的用户速率和可靠性。
以上所述仅是本发明的优选实施方式， 应当指出， 对于本技术领域的 普通技术人员来说， 在不脱离本发明原理的前提下， 还可以作出若干改进 和润饰， 这些改进和润饰也应视为本发明的保护范围。

Claims

权利要求书
1. 一种协作发送点的选择方法， 用于在下行多点协作通信中选择协作 发送点， 其特征在于， 包括：
步骤 A, 服务基站接收移动台上报的协作小区的测量信息， 所述测量 信息为： 所述移动台对预定的、 服务小区的第一协作小区列表中的协作小 区进行测量后获得的信息， 并根据所述上报的测量信息建立服务小区的第 二协作小区列表， 所述第二协作小区列表中的协作小区为： 所述第一协作 小区列表中信号强度大于预定的第一门限值的协作小区；
步骤 B, 所述服务基站将所述第二协作小区列表中满足预设协作条件 的协作小区确定为所述服务小区协作发送点。
2. 根据权利要求 1所述的选择方法， 其特征在于， 所述步骤 A中， 所 述移动台对所述第一协作小区列表中的协作小区进行的测量是： 在所述移 动台移动至服务小区的边缘或服务小区的服务质量不能满足预定的用户需 求时， 由所述服务基站或由所述移动台自身触发的测量。
3. 根据权利要求 1所述的选择方法， 其特征在于， 所述步骤 B中， 当 所述第二协作小区列表存在所属基站与所述服务基站是同一基站的第一协 作小区时， 将所述第一协作小区确定为协作发送点， 并确定所述第一协作 小区的工作模式为联合处理模式。
4. 根据权利要求 1所述的选择方法， 其特征在于， 所述步骤 B中， 当 所述第二协作小区列表存在所属基站与所述服务基站不相同的第二协作小 区时， 还包括：
所述服务基站与所述第二协作小区所属的基站进行信息交互， 并当所 述交互的信息表明所述第二协作小区满足预设的协作条件时， 将所述第二 协作小区确定为协作发送点。
5. 根据权利要求 4所述的选择方法， 其特征在于， 当所述交互的信息 表明所述第二协作小区满足如下协作条件中的至少一项时， 将所述第二协 作小区确定为协作发送点：
a, 所述第二协作小区的负载小于预定的第二门限值；
b , 所述第二协作小区占用的资源与所述服务基站分配给所述移动台的 资源不冲突；
c 所述第二协作小区的负载大于预定的第三门限值并小于预定的第四 门限值；
d, 所述第二协作小区的测量功率大于预定的功率阔值；
e, 所述第二协作小区的测量功率为所述第二协作小区列表中测量功率 最强或次强的协作小区。
6.根据权利要求 4或 5所述的选择方法，其特征在于，所述步骤 B中， 对于所属基站与所述服务基站不同的协作发送点， 还包括如下步骤中的至 少一项：
将占用的资源与所述服务小区分配资源冲突的协作发送点的工作模式 确定为协作调度或波束赋形模式；
当协作发送点和服务小区都是单天线或虚拟单天线时， 将所述协作发 送点的工作模式确定为联合处理模式；
将无法满足用户吞吐率的需求服务基站的协作发送点的工作模式确定 为联合处理模式；
将负载大于预定的第三门限值并小于预定的第四门限值的协作发送点 的工作模式确定为协作调度或波束赋形模式。
7. 根据权利要求 1至 5中任一项所述的选择方法， 其特征在于， 在所 述步骤 B之后， 还包括：
所述服务基站通知所述移动台测量所述协作发送点的信道信息； 所述服务基站根据所述协作发送点的信道测量信息， 确定出所述协作 发送点的初始工作参数， 并将所述初始工作参数发送至所述协作发送点。
8. 根据权利要求 7所述的选择方法， 其特征在于， 所述协作发送点的 信道信息由所述协作发送点根据所述移动台发送的侦测信号， 通过所述协 作发送点测量得到。
9.一种协作发送点的选择装置，用于在下行多点协作通信中选择协作发 送点， 其特征在于， 包括： 服务基站，
所述服务基站包括：
第一处理模块， 用于接收移动台上报的协作小区的测量信息， 所述测 量信息为： 所述移动台对预定的、 服务小区的第一协作小区列表中的协作 小区进行测量后获得的信息， 并根据所述上报的测量信息建立服务小区的 第二协作小区列表， 所述第二协作小区列表中的协作小区为： 所述第一协 作小区列表中、 信号强度大于预定的第一门限值的协作小区；
确定模块， 用于将所述第二协作小区列表中满足预设协作条件的协作 小区确定为协作发送点。
10. 根据权利要求 9所述的选择装置， 其特征在于， 所述确定模块包 括：
第一确定模块， 用于当所述第二协作小区列表存在所属基站与所述服 务基站是同一基站的第一协作小区时， 将所述第一协作小区确定为协作发 送点， 并确定所述第一协作小区的工作模式为联合处理模式。
11. 根据权利要求 9 所述的选择装置， 其特征在于， 所述确定模块包 括：
交互模块， 用于当所述第二协作小区列表存在所属基站与所述服务基 站不相同的第二协作小区时， 与所述第二协作小区所属的基站进行信息交 互；
第二确定模块， 用于当所述交互的信息表明所述第二协作小区满足预 设的协作条件时， 将所属第二协作小区确定为协作发送点。
12. 根据权利要求 11所述的选择装置， 其特征在于， 所述第二确定模 块， 进一步用于当所述交互的信息表明所述第二协作小区满足如下协作条 件中的至少一项时， 将所述第二协作小区确定为协作发送点：
a, 所述第二协作小区的负载小于预定的第二门限值；
b , 所述第二协作小区占用的资源与所述服务基站分配给所述移动台的 资源不冲突；
c 所述第二协作小区的负载大于预定的第三门限值并小于预定的第四 门限值；
d, 所述第二协作小区的测量功率大于预定的功率阔值；
e, 所述第二协作小区的测量功率为所述第一协作小区列表中测量功率 最强或次强的协作小区。
13. 根据权利要求 11或 12所述的选择装置， 其特征在于， 所述第二 确定模块， 进一步用于按照如下方式中的至少一种确定协作发送点的工作 模式：
将占用的资源与所述服务小区分配资源冲突的协作发送点的工作模式 确定为协作调度或波束赋形模式；
将占用的资源与所述服务小区分配资源不冲突的协作发送点的工作模 式确定为联合处理模式；
当协作发送点和服务小区都是单天线或虚拟单天线时， 将所述协作发 送点的工作模式确定为联合处理模式；
将无法满足用户吞吐率的需求的服务基站的协作发送点的工作模式确 定为联合处理模式；
将负载大于预定的第三门限值并小于预定的第四门限值的协作发送点 的工作模式确定为协作调度或波束赋形模式。
14. 根据权利要求 9至 12中任一项所述的选择装置， 其特征在于， 所 述服务基站还包括：
第二处理模块， 用于通知所述移动台测量所述协作发送点的信道信息； 参数确定模块， 用于根据所述协作发送点的信道测量信息， 确定出所 述协作发送点的初始工作参数， 并将所述初始工作参数发送至所述协作发 送点。
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