WO2012055284A1

WO2012055284A1 - Method and system for coordinated multi-point processing

Info

Publication number: WO2012055284A1
Application number: PCT/CN2011/078756
Authority: WO
Inventors: 刘敏; 王文焕
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-10-29
Filing date: 2011-08-23
Publication date: 2012-05-03
Also published as: CN102457886A

Abstract

The present invention provides a method for coordinated multi-point processing, so as to implement multi-point coordination. The method comprises: when a multi-point coordinated transmission/reception (CoMP) set is transparent to a user equipment, a base station determining a measurement set of the user equipment, and sending the measurement set to the user equipment; the user equipment receiving information about the measurement set, performing channel measurement on cells in the measurement set, and feeding channel state information back to the base station; the base station deciding whether coordinated multi-point transmission is performed on the user equipment according to the channel state information fed back by the user equipment.

Description

Multi-point cooperative processing method and system

Technical field

The present invention relates to the field of mobile communications, and in particular to a multipoint cooperative processing method and system in a broadband wireless communication system.

Background technique

As communication services evolve and people's needs grow, future wireless communication systems need to provide higher speeds, higher spectral efficiency, and lower cost services.

LTE-A (LTE- Advanced, Advanced Long Term Evolution) as a ^{3 GPP (3 rd generation partnership project} , Third Generation Partnership Project) LTE (long term evolution, Long Term Evolution) is the evolution of technology, it has been accepted by 3GPP organization.

One of the goals of LTE-A is to improve the spectrum efficiency and throughput of the system, especially at the cell edge. The reason is that the LTE-A system is a frequency division system based on an OFDM (orthogonal frequency division multiplex) system. In order to obtain efficient use of spectrum resources, most of the systems are systems with frequency reuse of 1, that is, neighboring cells use the same frequency. In this configuration, there is almost no interference problem in the cell because the carriers are completely orthogonal, but the interference problem between cells at the cell edge becomes quite serious. Therefore, LTE-A proposes to use Coordinated multi-point transmission/reception (CoMP) technology as an improvement in high data rate coverage and cell edge throughput, and/or in high load and low load. A means of increasing system throughput.

CoMP means that when a UE (user equipment) is located at multiple cell edges, multiple cells jointly perform multipoint data transmission/reception on the UE, or coordinate and schedule between multiple cells, thereby eliminating inter-cell communication. Interference, the purpose of improving signal quality and data throughput. In the current 3GPP TR 36.814 framework description, CoMP is divided into the following two categories:

(1) Joint processing (JP): User data can be obtained at each site in the collaboration set.

(2) Cooperative Scheduling/Beamforming (CS/CB, Coordinated Scheduling/Coordinated) Beamforming): User data is only sent by the serving cell, but its scheduling/beamforming scheme is determined by multiple cooperating cells in the cooperating set. The following definitions are made for the CoMP set:

CoMP Cooperative Set: A group of geographically independent and directly or indirectly participating in a cell that transmits a PDSCH (hypnical downlink shared channel) to a UE. The CoMP collaboration set can be opaque to the UE.

CoMP transmission set: A group or group of cells that send a PDSCH to a UE, which is a subset of the CoMP cooperating set.

CoMP measurement set: The cell that measures the status and statistics of the relevant channel according to the network request period or aperiod. The CoMP measurement set can be the same as the CoMP collaboration set. The cell of the downlink control channel has only one serving cell in the communication process.

According to the characteristics of CoMP, a cell selected into a CoMP set should have such characteristics: the cells in the CoMP set use the same frequency band; the subframes and symbols of the cell air interface in the CoMP set are basically aligned; the cells in the CoMP set belong to different The base station can communicate through the X2 interface for message delivery.

In the prior art, only a few sets of CoMP are defined, and the related set information is not described to the UE. In addition, after the UE obtains the set information, how to perform the corresponding processing also needs to be determined. Summary of the invention

The technical problem to be solved by the present invention is to provide a multi-point cooperative processing method and system, and realize multi-point cooperation.

In order to solve the above problem, the present invention provides a multi-point cooperation processing method. When a coordinated multi-point transmission (CoMP) collaboration set is transparent to a user equipment, the method includes:

The base station determines the measurement set of the user equipment, and sends the measurement set to the user equipment; the user equipment receives the measurement set information, performs channel measurement on the cell in the measurement set, and feeds back channel status information to the Base station The base station determines, according to the channel state information fed back by the user equipment, whether to perform coordinated multi-point transmission on the user equipment.

Preferably, the foregoing method may further have the following feature: the base station sends the measurement set information in a unicast manner.

Preferably, the foregoing method may further have the following feature: the user equipment feeding back channel state information includes:

The user equipment selects channel state information of some or all cells according to a preset rule and then feeds back.

Preferably, the foregoing method may further have the following feature: the measurement set information includes a cell identifier, or includes a cell identifier and a measurement period.

Preferably, the foregoing method may further have the following feature: the base station periodically sends the measurement set information, or sends the measurement set information after satisfying a preset condition.

The present invention provides a multi-point cooperative processing method, when a coordinated multi-point transmission (CoMP) set is opaque to a user equipment, including:

The base station sends the collaboration set information to the user equipment;

Receiving, by the user equipment, the cooperation set information, performing measurement on all or a part of the cells in the cooperation set, and feeding back channel state information to the base station;

The base station determines whether to perform coordinated multi-point transmission on the user equipment according to channel state information fed back by the user equipment.

Preferably, the above method may further have the following features, the method further comprising:

And when the base station determines to perform coordinated multi-point transmission on the user equipment, sending measurement set information to the user equipment;

The user equipment receives the measurement set information, performs channel measurement on all cells in the measurement set, and feeds back channel state information to the base station.

Preferably, the foregoing method may further have the following feature: the user equipment performing measurement on all or a part of the cells in the collaboration set includes: the user equipment selecting the collaboration set to appear in a neighboring cell column The cell in the table performs measurement; or the user equipment directly measures all cells in the cooperation set.

Preferably, the foregoing method may further have the following feature: the base station sends the collaboration set information in a unicast or broadcast manner, and sends the measurement set information in a unicast manner.

Preferably, the foregoing method may further have the following feature: when the base station sends the measurement set information, the cell with the same measurement set and the same set in the cooperation set is represented by a sequence number of the occurrence in the cooperation set information.

Preferably, the foregoing method may further have the following feature: the base station periodically sends the collaboration set information.

The present invention also provides a multipoint coordinated processing system, where the system includes a base station and user equipment, where:

The base station is configured to determine a measurement set of the user equipment, and send the measurement set to the user equipment; and, according to channel state information fed back by the user equipment, determine whether to perform coordinated multi-point transmission on the user equipment;

The user equipment is configured to receive the measurement set information, perform channel measurement on a cell in the measurement set, and feed back channel state information to the base station.

The base station is configured to send the cooperation set information to the user equipment; and, according to the channel state information fed back by the user equipment, determine whether to perform coordinated multi-point transmission on the user equipment;

The user equipment is configured to receive the cooperation set information, perform measurement on all or a part of the cells in the cooperation set, and feed back channel state information to the base station.

Preferably, the foregoing system may further have the following feature, the base station is further configured to: when determining to perform coordinated multi-point transmission on the user equipment, send measurement set information to the user equipment;

The user equipment is further configured to receive the measurement set information, perform channel measurement on all cells in the measurement set, and feed back channel state information to the base station.

The present invention also provides a base station, where the base station includes a measurement set determining module and a determining module; The measurement set determining module is configured to: determine a coordinated multi-point transmission (CoMP) measurement set of the user equipment, and send the measurement set to the user equipment;

The determining module is configured to: determine, according to the channel state information of the measurement centralized cell that is fed back by the user equipment, whether to perform coordinated multi-point transmission on the user equipment.

The present invention further provides a user equipment, where the user equipment includes a channel measurement module and a feedback module, and the channel measurement module is configured to: according to a coordinated multi-point transmission (CoMP) measurement set sent by the base station, Cell for channel measurement;

The feedback module is configured to feed back channel state information to the base station.

The present invention also provides a base station, where the base station includes an information sending module and a determining module, where

The information sending module is configured to: send a coordinated multi-point transmission (CoMP) collaboration set information to the user equipment;

The determining module is configured to: determine whether to perform coordinated multi-point transmission on the user equipment according to the channel state information of the coordinated centralized cell that is fed back by the user equipment.

Preferably, in the above base station,

The information sending module is further configured to: when the determining module determines to perform coordinated multi-point transmission on the user equipment, send CoMP measurement set information to the user equipment.

The present invention also provides a user equipment, where the user equipment includes a channel measurement module and a feedback module.

The channel measurement module is configured to: receive multi-point coordinated transmission (CoMP) cooperation set information sent by the base station, and perform measurement on all or a part of the cells in the cooperation set;

The feedback module is configured to: feed back channel state information measured by the channel measurement module to the base station.

Preferably, in the foregoing user equipment, the channel measurement module is further configured to: receive CoMP measurement set information sent by the base station, and perform channel measurement on all cells in the measurement set.

According to the present invention, the base station can transmit related cooperative system information transparently or non-transparently; after obtaining the system information, the UE can perform corresponding measurement and feedback, and finally pass through the base station/inter-cell. Collaboration improves system throughput and enhances system coverage at the cell edge.

BRIEF abstract

1 is a flowchart of a method for multi-point cooperation processing when a collaboration set is transparent to a UE according to an embodiment of the present invention;

2 is a flowchart of a multi-point cooperative processing method when a collaboration set is opaque to a UE according to an embodiment of the present invention;

FIG. 3 is a flowchart of another multi-point cooperation processing method when the cooperation set provided by the embodiment of the present invention is opaque to the UE.

Preferred embodiment of the invention

The embodiment of the present invention proposes a scheme for transmitting the cooperation set information and the UE receiving processing based on the definition of the CoMP set.

Option One

For the CoMP cooperating set, if the set is transparent to the UE, the base station sends the CoMP measurement set to the UE, and the UE performs measurement according to the CoMP measurement set and feeds back relevant channel state information. The base station determines whether to perform multi-point coordinated transmission on the UE according to the channel state information fed back by the UE.

The configuration information of the CoMP measurement set may be sent to the UE in the form of unicast information. The transmission of the CoMP measurement set may be periodic, or may be specified by the eNB side, and the measurement set information is sent to the UE after the preset condition is met, for example, the eNB. According to the configuration of the cell load and the state of the corresponding UE, if it is determined that the corresponding UE meets the basic conditions for performing cooperative measurement, and if the corresponding UE is at the cell edge, the coordinated set measurement message is sent to the corresponding UE.

The measurement set configuration information includes: a Cell ID; and may also include a measurement period.

When the UE performs feedback, the measured channel state information of all the cells may be fed back, or may be selected according to a certain rule, and the measured value conforms to the coordinated cell channel state information of the rule to be fed back, thereby reducing the feedback amount. The rule can be:

Pre-setting a gate for RSRQ (Reference Signal Receiving Quality) or RSRP (Reference Signal Receiving Power) The limit value (which can be set by the UE or sent to the UE by the base station), and the measured value above the threshold is selected. The rule is mainly applicable to the JP mode;

Alternatively, the measured RSRQ or RSRP values are sorted, and the first n (n>=2) are selected for feedback;

The above rules are only examples, and other rules can be set to select.

Option II

If the CoMP cooperating set is opaque to the UE, the base station needs to send the CoMP cooperation set configuration information to the corresponding UE, and the information may be sent by using broadcast or unicast information, and the sending period is indicated by other system information. After receiving the channel state information fed back by the UE, it is determined whether to perform coordinated multi-point transmission on the UE. When it is decided to perform coordinated multi-point transmission on the UE, the measurement set information is also sent to the UE.

Wherein, when the measurement set is the same as the cell included in the cooperation set, the configuration information in the measurement set may omit the Cell lD information, and only use the corresponding sequence number in the cooperation set information to reduce the transmission load. When the measurement set is a subset of the cooperation set, the related configuration information of the CoMP measurement set may be notified to the UE by using the unicast information, or the corresponding cell in the measurement set is represented by only the sequence number that appears in the cooperation set, without using the corresponding Cell ID. Thereby saving the overhead of sending information.

The collaboration set configuration information includes: a Cell ID. The measurement set configuration information includes: a sequence number corresponding to the Cell ID or the Cell ID, a measurement period, and the like.

After receiving the cooperation set information, the UE may locally save a cooperation set cell information list, and update the cooperation set cell list in real time according to the cooperation set information sent by the base station, where the content may include a cell identifier.

The UE may select a cell belonging to the cooperation set to perform measurement and feed back channel state information according to the received neighbor cell list, and the base station performs coordinated transmission of the service data according to the channel state information fed back by the UE.

The base station may also adjust the measurement set according to the channel state information fed back by the UE and send the measurement set to the UE, and the UE performs the coordinated cell channel state measurement and feedback by using the configuration information of the reference measurement set. A method for transmitting and receiving multipoint cooperation information according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1

When the CoMP cooperating set is transparent to the UE, the processing procedure from the UE receiving the measurement set information to the measurement and feedback is as follows:

Step 101: The base station determines a CoMP measurement set of the UE according to the configuration of the cooperation set and the location of the UE.

Step 102: The base station sends measurement set information to the UE.

The base station sends the measurement set information in a unicast manner. Specifically, the RRC re-allocation message may be used, or the other measurement information may be carried by the other measurement message. The other message may be a new collaboration set measurement message.

Step 103: After receiving and decoding the measurement set information, the UE performs channel measurement on the corresponding cell, calculates channel information, and selects all or part of the cell channel state information according to a certain rule, and feeds back in an implicit or explicit manner;

Step 104: The base station receives the UE feedback information, determines whether to perform coordinated multi-point transmission on the UE according to the feedback information, and whether to adjust the content of the measurement set, and then repeats step 102 according to a certain period.

In step 102, the CoMP measurement set information may be in the form of a measConfigCoMP IE (information element) in an RRC Connection Reconfiguration message, and the content may include a cell identifier and a measurement period, and a CoMP measurement set If the information is not sent periodically, the measurement set information only needs to include the cell identifier. The specific format may be as follows. The italic part is used to carry the measurement set information:

- ASNl START

RRCConnectionReconfiguration ::= SEQUENCE {

measConfig MeasConfig OPTIONAL, - Need ON

mobilityControlInfo MobilityControlInfo OPTIONAL, - Cond HO

dedicatedlnfoNASList SEQUENCE (SIZE(l..maxDRB)) OF DedicatedlnfoNAS OPTIONAL, - Cond nonHO

radioResourceConfigDedicated RadioResourceConfigDedicatedOPTIONAL, -- Cond HO-toEUTRA securityConfigHO SecurityConfigHO OPTIONAL, - Cond HO

nonCriticalExtension-v9xO RRCConnectionReconfiguration-v9xO-IEs OPTIONAL— Need ON

measConfigCoMP MeasConfigCoMP OPTIONAL, - Need ON

}

MeasConfigCoMP:: = SEQUENCE {

physCellld PhysCellld OPTIONAL, - Need ON

measObjectPeriod MeasObjectPeriod OPTIONAL, - Need ON

}

- ASN1STOP

Embodiment 2

As shown in FIG. 2, for a base station in which a CoMP cooperative set uses a non-transparent transmission mode, a process for the UE to receive cooperation set information, measurement set information, measurement, and feedback is as follows:

Step 201: The base station sends the CoMP collaboration set information in a broadcast or unicast manner.

Step 202: After receiving the CoMP collaboration set information, the UE measures and calculates all cell channel state parameters included in the collaboration set.

Step 203: The UE feeds back the measured cell channel state information in an implicit or explicit manner. Step 204: The base station receives the cell channel state information fed back by the UE, and determines whether to perform coordinated multi-point transmission on the UE according to the feedback information. Determining that the UE does not perform multi-point coordinated transmission, when the set period arrives, return to step 201; if the base station decides to perform coordinated multi-point transmission to the UE, step 205 is performed;

Step 205: If the base station decides to perform coordinated multi-point transmission on the UE, further determining related information such as a collaboration mode and a measurement set and transmitting the information;

Step 206: The UE receives the measurement set information, and measures the channel state parameters of the corresponding cell. After the UE completes the measurement, it returns to step 203.

The CoMP cooperating set in step 201 may be sent as a system information by using a SystemlnformationBlockTypeX IE, where the cell identifier list is carried in the CoMPCooperationCellList, and the format may be as follows:

- ASN1 START

SystemlnformationBlockTypeX information element

SystemlnformationBlockTypeX:: = SEQUENCE {

CoMPCooperationCellList CoMPCooperationCellList OPTIONAL, - Need OR

}

CoMPCooperationCellList:: = SEQUENCE {

p ysCellld P ysCellld,

}

PhysCellld:: = INTEGER (0..127)

- ASN1STOP

The CoMP measurement set in step 205 may be in the form of a measConfigCoMP IE (information element) in the RRC Connection Reconfiguration message, and the content includes the cell sequence number and the measurement period. The specific format may be as follows:

- ASNl START

RRCConnectionReconfiguration ::= SEQUENCE {

measConfig MeasConfig OPTIONAL, - Need ON

mobilityControlInfo MobilityControlInfo OPTIONAL, - Cond HO

dedicatedlnfoNASList SEQUENCE (SIZE(l..maxDRB)) OF

DedicatedlnfoNAS OPTIONAL, - Cond nonHO

measConfigCoMP MeasConfigCoMP OPTIONAL, - Need ON }

MeasConfigCoMP:: = SEQUENCE {

physCellNoId PhysCellNoId OPTIONAL, - Need ON

measObjectPeriod MeasObjectPeriod OPTIONAL, - Need ON

}

- ASN1STOP

Embodiment 3

As shown in FIG. 3, for a base station in which a CoMP cooperative set uses a non-transparent transmission mode, a process for the UE to receive cooperation set information, measurement set information, measurement, and feedback is as follows:

Step 301: The base station sends the CoMP collaboration set information in a broadcast or unicast manner.

Step 302: After receiving the CoMP cooperation set information, the UE selects a channel state parameter corresponding to the cell that appears in the neighbor cell list to perform measurement and calculation.

Step 303: The UE feeds back channel state information to the base station in an implicit or explicit manner according to the obtained measurement parameters.

Step 304: The base station receives the cell channel state information fed back by the UE, and determines whether to perform coordinated multi-point transmission on the UE according to the feedback information. If the base station decides not to perform coordinated multi-point transmission on the UE, when the set period arrives, the process returns to step 301. If the base station decides to perform multi-point coordinated transmission to the UE, step 305 is performed;

Step 305: If the base station decides to perform coordinated multi-point transmission on the UE, further determining related information such as a collaboration mode and a measurement set and transmitting the information;

Step 306: The UE receives the measurement set information, and performs measurement and calculation on the corresponding cell channel state parameter. The UE completes the measurement and feeds back the obtained channel state information, and returns to step 304.

With the above implementation manner of the present invention, the base station may transparently or non-transparently transmit related cooperative system information; after obtaining the system information, the UE may perform corresponding measurement and feedback, and finally improve system throughput rate through base station/cell cooperation. Enhance the coverage of the system at the edge of the cell. Industrial Applicability The present invention provides a multipoint cooperative processing method and system for realizing multipoint cooperation. According to the present invention, the base station can transparently or non-transparently transmit related cooperative system information; after acquiring the system information, the UE can perform corresponding measurement and feedback, and finally improve system throughput rate through base station/cell cooperation, and enhance the system in the cell. Coverage of the edges.

Claims

Claim

1. A multi-point collaborative processing method, comprising:

When a coordinated multi-point transmission (CoMP) collaboration set is transparent to user equipment,

Determining, by the base station, a CoMP measurement set of the user equipment, and sending the measurement set to the user equipment;

Receiving, by the user equipment, the measurement set information, performing channel measurement on the cell in the measurement set, and feeding back channel state information to the base station;

The base station determines, according to the channel state information fed back by the user equipment, whether to perform coordinated multi-point transmission on the user equipment.

2. The method according to claim 1, wherein the base station transmits the measurement set information in a unicast manner.

The method of claim 2, wherein the step of the user equipment feeding back channel state information to the base station comprises:

The user equipment selects channel state information of some or all cells according to a preset rule and feeds back the selected channel state information to the base station.

The method according to claim 1, wherein the measurement set information includes a cell identifier, or includes a cell identifier and a measurement period.

The method according to claim 1, wherein, in the step of transmitting, by the base station, the measurement set to the user equipment, the base station periodically sends the measurement set information, or The measurement set information is transmitted when the condition is set.

6. A multi-point collaborative processing method, comprising:

When a coordinated multi-point transmission (CoMP) collaboration set is opaque to a user equipment,

The base station sends the CoMP collaboration set information to the user equipment;

Receiving, by the user equipment, the cooperation set information, performing measurement on all or a part of cells in the cooperation set, and feeding back channel state information to the base station;

7. The method of claim 6 further comprising:

After receiving the measurement set information, the user equipment performs channel measurement on all cells in the measurement set, and feeds back channel state information to the base station.

8. The method of claim 6, wherein

The step of the user equipment performing measurement on all or a part of the cells in the collaboration set includes: the user equipment selecting a cell that appears in the neighboring cell list in the collaboration set to perform measurement; or, the user equipment directly refers to the All cells in the collaborative set are measured.

9. The method of claim 7, wherein

The base station sends the collaboration set information in a unicast or broadcast manner, and sends the measurement set information in a unicast manner.

10. The method of claim 7, wherein

When the base station sends the measurement set information, the measurement set is the same as the cell in the cooperation set, and the sequence number of the appearance of the cell in the cooperation set information is used in the measurement set.

11. The method of claim 6, wherein

In the step of transmitting the cooperation set information to the user equipment, the base station periodically transmits the cooperation set information.

12. A multi-point collaborative processing system, comprising a base station and user equipment, wherein:

The base station is configured to: determine a coordinated multi-point transmission (CoMP) measurement set of the user equipment, and send the measurement set to the user equipment; and determine, according to channel state information fed back by the user equipment, whether the user is The device performs multi-point coordinated transmission;

The user equipment is configured to: receive the measurement set information, perform channel measurement on a cell in the measurement set, and feed back channel state information to the base station.

13. A multi-point collaborative processing system, comprising a base station and user equipment, wherein:

The base station is configured to: send a coordinated multi-point transmission (CoMP) cooperation set information to the user equipment; and determine, according to channel state information fed back by the user equipment, whether to perform the user equipment Multi-point collaborative launch;

The user equipment is configured to: receive the cooperation set information, perform measurement on all or a part of the cells in the cooperation set, and feed back channel state information to the base station.

14. The system of claim 13 wherein

The base station is further configured to: send when the multi-point coordinated transmission is performed on the user equipment,

CoMP measurement set information to the user equipment;

The user equipment is further configured to: receive the measurement set information, perform channel measurement on all cells in the measurement set, and feed back channel state information to the base station.

A base station, where the base station includes a measurement set determining module and a determining module, where the measurement set determining module is configured to: determine a coordinated multi-point transmission (CoMP) measurement set of the user equipment, and send the measurement set to The user equipment;

A user equipment, the user equipment includes a channel measurement module and a feedback module, and the channel measurement module is configured to: perform, according to a coordinated multi-point transmission (CoMP) measurement set sent by the base station, to the cell in the measurement set Channel measurement

A base station, where the base station includes an information sending module and a determining module, where the information sending module is configured to: send a coordinated multi-point transmission (CoMP) cooperative set information to a user equipment;

18. The base station according to claim 17, wherein

19. A user equipment, where the user equipment includes a channel measurement module and a feedback module, and the channel measurement module is configured to: receive a coordinated multi-point transmission (CoMP) protocol sent by the base station. Collecting information, measuring all or part of the cells in the collaboration set;

The user equipment of claim 19, wherein the channel measurement module is further configured to: receive CoMP measurement set information sent by the base station, and perform channel measurement on all cells in the measurement set.