CN101888665B - Local scheduler-based multi-point cooperative transmission method - Google Patents
Local scheduler-based multi-point cooperative transmission method Download PDFInfo
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Abstract
The invention discloses a local scheduler-based multi-point cooperative transmission method, which comprises that: CoMP UE selects K cells from neighboring cells of a local cell as measurement cells and reports the channel state information (CSI) of the local cell and the measurement cells to the base station of the local cell according to MIMO modes and a CoMP types, which are supported by the local cell; the base station of the local cell performs UE scheduling and resource distribution according to the MIMO modes and CoMP types, which are supported by the local cell, and transmits the resources distributed to UE, the MIMO modes and CoMP types, which are supported by the local cell, as well as corresponding resources and CQI difference values, which are recommended to the corresponding measurement cells on the time-frequency resource occupied by the UE, to the cooperative cells; the measurement cells determine if to provide CoMP services and the CoMP types for the UE according to a cooperation message, wherein the measurement cells which provide CoMP services for the UE are cooperative cells; and the local cell and the cooperative cells transmit data for the UE according to the CoMP types.
Description
Technical field
The present invention relates to multi-point cooperative transmission (CoMP) technology, particularly a kind of multi-point cooperative transmission method based on local scheduler.
Background technology
In the LTE-A system, introduce the CoMP technology and realize the interference coordination of minizone, guarantee user's data transfer rate and performance, this transmission plan provides the mode of service jointly by a plurality of residential quarters to the user, improve user's communication quality.
MIMO is the general name of the many antennas transmissions of system configuration or many antenna receptions technology, existing 3 class MIMO technology, SU-MIMO (Single User MIMO), MU-MIMO (multiuser MIMO) and CoMP-MIMO (multi-point cooperative MIMO is also referred to as network MIMO) are used for improving user rate, throughput of system and Cell Edge User communication quality.When single subdistrict base station service unique user, be called SU-MIMO; When a plurality of user is served in the single subdistrict base station, be called MU-MIMO; When unique user is served simultaneously in the base station of a plurality of residential quarters, be called CoMP-SU-MIMO; When a plurality of user is served simultaneously in the base station of a plurality of residential quarters, be called CoMP-MU-MIMO.
3GPP defines two class multi-point cooperative transmission modes at present:
(1) inter-cell united scheduling/beam shaping
Combined dispatching is the upgrading of the dynamic interference coordination method of LTE system, the base station sends the employed running time-frequency resource of edge customer to neighbor cell, make neighbor cell avoid using these resources, when neighboring cell loading is overweight when having to use these resources, then reduce edge user's interference by power control; The united beam excipient is to utilize the intelligent antenna beam excipient, or the MIMO precoding technique disturbs with the processing mode reduction of " empty minute " the identical running time-frequency resource of neighbor cell, as shown in Figure 1, BS1 and BS2 be at the alone family of identical running time-frequency resource service, and BS1 utilizes the beam shaping technology to avoid co-channel interference to MS2 simultaneously.In the time of inter-cell united beam shaping, can provide MU-MIMO or the service of multi-flow beam excipient for this residential quarter by MIMO precoding technique or intelligent antenna technology, namely on same asset, serve simultaneously 2 above users in empty divisional processing mode, as shown in Figure 2, BS2 serves MS2 and MS3 simultaneously, and BS1 avoids co-channel interference to MS2 simultaneously at identical running time-frequency resource service MS1.Compare the wave beam situation that in addition schedule information that not only needs mutual edge customer between the residential quarter also has the edge customer use with combined dispatching.This cooperative mode remains a terminal and provides data transport service by a residential quarter, but since need to be between the residential quarter interactive space information, increased the burden of the wired carrying in minizone.
(2) inter-cell united transmission
Different from inter-cell united scheduling/beam shaping, inter-cell united transmission is that many residential quarters provide service to the user simultaneously on same asset, has therefore avoided the interference of neighbor cell to this Cell Edge User.Because send data to the user during multiple sectors at same, user's data need to be shared between the residential quarter.General, the CoMP-SU-MIMO mode is provided, namely a base station can only be served a user simultaneously, this base station can be and this user of other base stations united services that as shown in Figure 3, BS1 and BS2 only serve MS2, only to the MS1 service, BS1 and BS2 have realized the joint transmission to MS2 to BS; If introducing spatial reuse, system can also be under the CoMP-MU-MIMO mode service-user, be that the base station can be served a plurality of users simultaneously, this base station can with these users of other base stations united services, as shown in Figure 4, the MU-MIMO mode is all adopted in 3 base stations, and BS1 and BS2 provide joint transmission to MS2, BS2 and BS3 provide joint transmission to MS3, and BS1 and BS3 provide joint transmission to MS1.Under the CoMP-SU-MIMO mode, the base station sends the employed running time-frequency resource of edge customer to neighbor cell, makes neighbor cell avoid user with this resource service oneself, and for the federated service edge customer; Under the CoMP-MU-MIMO mode, also to send spatial information (si) except sending the running time-frequency resource information to neighbor cell, make neighbor cell with empty this user of running time-frequency resource federated service of edge customer, avoid producing with the own user who serves and conflict.Compare with inter-cell united scheduling/beam shaping, inter-cell united transmission also needs minizone carrying transmitting user data, and wired carrying expense is larger.
During the cooperative transmission of many residential quarters, need mutual bulk information between the base station.Particularly, in present CoMP transmission technology, adopt the combined dispatching mode to determine that each cooperation cell is the resource that UE distributes, before the resource that is defined as the UE distribution, need to regard to UE each running time-frequency resource recommend PMI or the wave beam numbering that cooperation cell uses and use the PMI that recommends or the CQI information after the wave beam numbering etc. carry out mutual, thereby so that between the base station mutual amount of information very large.To all have higher requirements to carrying between the base station and air interface capability and time-delay alternately of bulk information.
Summary of the invention
In view of this, the invention provides a kind of multi-point cooperative transmission method based on local scheduler, can greatly reduce the transinformation content between the base station.
For achieving the above object, the present invention adopts following technical scheme:
A kind of multi-point cooperative transmission method based on local scheduler comprises:
The UE of multi-point cooperative transmission CoMP selects K residential quarter as measuring the residential quarter from the neighbor cell of this residential quarter, and described UE reports the channel condition information CSI of this residential quarter and measurement residential quarter according to MIMO pattern and the CoMP type of this residential quarter support to the base station of this residential quarter; Wherein, described K is the constant of systemic presupposition;
The base station of described this residential quarter, MIMO pattern and CoMP type according to this residential quarter support, carry out the scheduling of described UE and resource and distribute, and take corresponding resource and the CQI difference that running time-frequency resource is recommended corresponding measurement residential quarter to each described measurement cell transmission is the described UE resource of distributing, this residential quarter is supported MIMO pattern and CoMP type and at described UE;
Each described measurement residential quarter determines whether to provide CoMP service and the CoMP type that provides for described UE according to cooperation message; This residential quarter and each provide the cooperation cell of CoMP service according to described CoMP type, are described UE the transmission of data.
Preferably, K the strongest residential quarter of selective reception pilot frequency intensity from the neighbor cell of described this residential quarter is as measuring the residential quarter.
Preferably, when described base station is only supported SU-MIMO and is only supported inter-cell united beam shaping,
The CSI of this residential quarter that described UE reports comprises: the average CQI of total bandwidth and the CQI of each sub-frequency bands when described PMI or wave beam numbering are adopted in the pre-coding matrix index PMI that use the recommendering folder residential quarter or wave beam numbering, this residential quarter;
The CSI of the measurement residential quarter that described UE reports comprises: PMI or the set of wave beam numbering of measuring the residential quarter forbidding; With, when the PMI that use this employing recommendering folder residential quarter, residential quarter or wave beam numbering, measure the residential quarter use described UE take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, during with the PMI that adopts described UE to take to forbid on the running time-frequency resource or wave beam numbering, UE receives the CQI difference DELTA CQI of signal
0
Preferably, when described base station is only supported SU-MIMO and is only supported inter-cell united transmission,
The CSI of this residential quarter that described UE reports comprises: the average CQI of total bandwidth and the CQI of each sub-frequency bands when described PMI or wave beam numbering are adopted in the PMI that use the recommendering folder residential quarter or wave beam numbering, this residential quarter;
The channel condition information of the measurement residential quarter that described UE reports comprises: recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out in the residential quarter; The reception signal CQI of UE when adopting PMI that recommendering folder residential quarter uses or wave beam numbering to carry out transfer of data separately with, this residential quarter, the difference DELTA CQI between the described UE reception signal CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission
1
Preferably, when described base station is supported MU-MIMO and is only supported inter-cell united beam shaping,
The channel condition information of this residential quarter that described UE reports comprises: the average CQI of total bandwidth and the CQI of each sub-frequency bands behind the PMI that adopted the recommendering folder residential quarter when UE monopolized this local resource, the described PMI of employing; The PMI that use other each pairing user the recommendering folder residential quarter when matching with, UE and other users and match rear described UE with other each pairing user and receive the CQI of signal and the CQI of each sub-frequency bands;
The channel condition information of the measurement residential quarter that described UE reports comprises: PMI or the set of wave beam numbering of measuring the residential quarter forbidding; With, this residential quarter adopts the PMI of recommendering folder residential quarter or wave beam to number when monopolizing this local resource, measure the residential quarter use described UE take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, during with the PMI that adopts described UE to take to forbid on the running time-frequency resource or wave beam numbering, UE receives the CQI difference DELTA CQI of signal
0
Preferably, when described base station is supported MU-MIMO and is only supported inter-cell united transmission,
The channel condition information of this residential quarter that described UE reports comprises: the PMI that adopted the recommendering folder residential quarter when UE monopolized this local resource and adopt described PMI after the average CQI of total bandwidth and the CQI of each sub-frequency bands; With, the PMI that used other each pairing user the recommendering folder residential quarter when UE and other users matched and match rear described UE with other each pairing user and receive the CQI of signal and the CQI of each sub-frequency bands;
The channel condition information of the cooperation cell that described UE reports comprises: recommend to measure the residential quarter and carry out PMI or the set of wave beam numbering that joint transmission adopts; The reception signal CQI of UE when adopting PMI that recommendering folder residential quarter uses or wave beam numbering to monopolize this local resource to carry out transfer of data separately with, this residential quarter, the difference DELTA CQI between the described UE reception signal CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission
1
Preferably, when described base station is supported MU-MIMO and is supported simultaneously minizone beam shaping and joint transmission,
The channel condition information of this residential quarter that described UE reports comprises: the PMI that adopted the recommendering folder residential quarter when UE monopolized this local resource and adopt described PMI after the average CQI of total bandwidth and the CQI of each sub-frequency bands; The PMI that use other each pairing user the recommendering folder residential quarter when matching with, UE and other users and match rear described UE with other each pairing user and receive the CQI of signal and the CQI of each sub-frequency bands;
The channel condition information of the measurement residential quarter that described UE reports comprises: PMI or the set of wave beam numbering of measuring the residential quarter forbidding; With, this residential quarter adopts the PMI of recommendering folder residential quarter or wave beam to number when monopolizing this local resource, measure the residential quarter use described UE take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, during with the PMI that adopts described UE to take to forbid on the running time-frequency resource or wave beam numbering, UE receives the CQI difference DELTA CQI of signal
0With, recommend to measure the residential quarter and carry out PMI or the set of wave beam numbering that joint transmission adopts; The reception signal CQI of UE when adopting PMI that recommendering folder residential quarter uses or wave beam numbering to monopolize this local resource to carry out transfer of data separately with, this residential quarter, the difference DELTA CQI between the UE reception signal CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission
1
Preferably, when described base station was only supported SU-MIMO and only supported inter-cell united beam shaping, described base station took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise to what described cooperation cell sent:
The PMI that other UE of running time-frequency resource service that recommend cooperation cell to take at described UE adopt or the set of wave beam numbering; With,
When this residential quarter adopts PMI that described UE recommends or wave beam numbering to monopolize this local resource, when measuring the residential quarter and using described UE to take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering described UE receive the CQI of signal, the difference DELTA CQI during with the PMI that uses described UE to take to forbid on the running time-frequency resource or wave beam numbering between the CQI of described UE reception signal
0
Preferably, when described base station was only supported SU-MIMO and only supported inter-cell united transmission, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise:
Recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out to described UE in the residential quarter on the running time-frequency resource that described UE takies; With,
The CQI of the reception signal of UE when this residential quarter adopts the PMI of recommendering folder residential quarter or wave beam numbering to monopolize this local resource to carry out the independent data transmission, the difference DELTA CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission between the CQI of described UE reception signal
1
Preferably, when described base station was supported MU-MIMO and only supported inter-cell united beam shaping, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding cooperation cell and comprise:
Take running time-frequency resource at described UE and measure PMI or the set of wave beam numbering of forbidding when other UE are served in the residential quarter; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or with other UE pairings after, when measuring the residential quarter and using described UE to take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering described UE receive the CQI of signal, the difference DELTA CQI during with the PMI that uses described UE to take to forbid on the running time-frequency resource or wave beam numbering between the CQI of described UE reception signal
0
Preferably, when described base station was only supported MU-MIMO and only supported inter-cell united transmission, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise:
Recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out to described UE in the residential quarter on the running time-frequency resource that described UE takies; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or and other UE pairings and when only this residential quarter is to described UE the transmission of data described UE receive the CQI of signal, the difference DELTA CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission between the CQI of described UE reception signal
1
Preferably, when described base station was supported MU-MIMO and supported simultaneously inter-cell united beam shaping and joint transmission, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise:
Take running time-frequency resource at described UE and measure PMI or the set of wave beam numbering of forbidding when other UE are served in the residential quarter; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or with other UE pairings after, when measuring the residential quarter and using described UE to take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering described UE receive the CQI of signal, the difference DELTA CQI during with the PMI that uses described UE to take to forbid on the running time-frequency resource or wave beam numbering between the CQI of described UE reception signal
0
With, recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out to described UE in the residential quarter on the running time-frequency resource that described UE takies; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or and other UE pairings and when only this residential quarter is to described UE the transmission of data described UE receive the CQI of signal, the difference DELTA CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission between the CQI of described UE reception signal
1
Preferably, under different MIMO patterns and CoMP type, described UE adopts the unified message format that arranges when reporting this residential quarter and measuring residential quarter CSI.
Preferably, described UE reports the CSI of this residential quarter and the CSI of measurement residential quarter respectively, and the report cycle of the channel condition information of this residential quarter is equal to or less than the report cycle of the channel condition information of measuring the residential quarter.
Preferably, under different MIMO patterns and CoMP type, the message format of the Resources allocation that described base station sends to the measurement residential quarter, the MIMO pattern of support and CoMP type, the unified setting of employing when measuring residential quarter CSI.
Preferably, if described base station sends the cycle of measurement message greater than the cycle of described UE reporting measurement residential quarter CSI to measuring the residential quarter, when then described base station sends cooperation message to the measurement residential quarter, with all Δ CQI that do not send
1Send after average, with all Δ CQI that do not send
0Send after average.
Preferably, when the CoMP type that is defined as described UE and provides when arbitrary described measurement residential quarter was inter-cell united transmission, the method further comprised: will the cooperate time frequency space resource used of this measurement residential quarter feeds back to the base station of described this residential quarter; Described cell base station sends to this cooperation cell with data, transformat and the antenna end slogan that this cooperation cell sends.
Preferably, during for the UE the transmission of data, if described CoMP type is the multi-plot joint beam shaping, the CQI in this residential quarter CSI information that this residential quarter reports according to described UE determines MCS; If described CoMP type is multi-plot joint transmission, the CQI in this residential quarter CSI information that this residential quarter reports according to described UE and the Δ CQI in the cooperation cell CSI information
1Determine MCS.
As seen from the above technical solution, among the present invention, the UE of multi-point cooperative transmission, from the neighbor cell of this residential quarter, select K residential quarter as measuring the residential quarter, this UE reports the channel condition information (CSI) of this residential quarter and measurement residential quarter according to MIMO pattern and the CoMP type of this residential quarter support to the base station of this residential quarter; The base station of this residential quarter, according to the MIMO pattern of this residential quarter support and the CSI of CoMP type and UE transmission, finish the scheduling of UE and resource and distribute, and measure MIMO pattern and the CoMP type of resource that cell transmission distributes for this UE, this residential quarter support and take running time-frequency resource at UE to each and recommend corresponding resource and the CQI difference of respectively measuring the residential quarter; Each is measured the residential quarter and determines whether to be cooperation cell for this UE provides CoMP service and CoMP type for UE provides the measurement residential quarter of CoMP service; This residential quarter and each cooperation cell are the UE the transmission of data according to the CoMP type of determining.By the way, finished the CoMP transmitting and scheduling resource of UE by the base station of residential quarter, UE place and distribute, namely carry out the CoMP transmission based on local scheduler.Like this, at first finished the resource distribution of UE by the base station, send to corresponding measurement residential quarter with recommending the respective resources of measuring the residential quarter on this Resources allocation again, with respect to the mode that the resource of recommending on each running time-frequency resource is transmitted, can greatly reduce amount of information mutual between the base station between the base station.
Description of drawings
Fig. 1 is the schematic diagram of inter-cell united beam shaping under the SU-MIMO; Wherein, the useful signal of 1:MS1; 2: to the interference of MS1; The useful signal of 3:MS2; 4: to the interference of MS2.
Fig. 2 is the schematic diagram of inter-cell united beam shaping under the MU-MIMO; Wherein, the useful signal of 1:MS1; 2: to the interference of MS1; The useful signal of 3:MS2; 4: to the interference of MS2; The useful signal of 5:MS3; 6: to the interference of MS3.
Fig. 3 is the schematic diagram of inter-cell united transmission under the SU-MIMO; Wherein, the useful signal of 1:MS1; The useful signal of 2:MS2.
Fig. 4 is the schematic diagram of inter-cell united transmission under the MU-MIMO; Wherein, the useful signal of 1:MS1; The useful signal of 2:MS2; The useful signal of 3:MS3.
Fig. 5 is the schematic diagram that multiple MIMO mode mixture is used; Wherein, the useful signal of 1:MS1; 2: to the interference of MS1; The useful signal of 3:MS2; 4: to the interference of MS2; The useful signal of 5:MS3; 6: to the interference of MS3.
Fig. 6 is the schematic diagram of various CQI differences.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.
Basic thought of the present invention is: after finishing the UE scheduling of resource by the residential quarter at CoMP UE place, only will recommend other resources of measuring the residential quarter at the shared running time-frequency resource of this UE transmits, and for the shared running time-frequency resource of non-UE, the resource information that no longer transmission is recommended between the base station.
Usually, lower for Cell Edge User SINR value, employing CoMP transmission means can effectively be eliminated the interference between neighbor cell, improves the data receiver performance; And for Cell Center User, SU-MIMO or MU-MIMO can provide higher performance gain, then do not adopt the CoMP transmission means, therefore, usually adopt the CoMP transmission means for Cell Edge User, described CoMP UE is Cell Edge User namely, and adopts SU-MIMO or MU-MIMO for Cell Center User.
In addition, the applicable scene of various MIMO patterns and the performance of generation depend on network topology and wireless transmission environment (multipath, antenna angle of arrival, channel relevancy) and QoS of survice requirement (alone family speed, average throughput, time delay etc.).SU-MIMO, MU-MIMO and CoMP-MIMO have advantage separately, and a certain MIMO pattern can not be applicable to all scenes, so only to dispose a kind of MIMO pattern in the IMT-A system be poor efficiency.For the business that requires for different QoS in various wireless environment provides service, system need to dispose multiple MIMO pattern, and switches between various patterns neatly according to the applied environment of complexity.Fig. 5 is the example that multiple MIMO mode mixture is used, and BS2 serves simultaneously MS2 and MS3 so it and is operated in the MU-MIMO pattern; And BS1 and BS3 only are MS1 and MS3 service so are operated in the SU-MIMO pattern.MS3 receives the transmission of BS2 and BS3 simultaneously, therefore is operated in CoMP joint transmission pattern; MS1 receives only the data of BS1, and BS3 avoids the interference to MS1 by " empty minute " simultaneously, so MS1 is operated in CoMP united beam excipient pattern; Similar with MS1, MS2 provides data transport service by BS2, and BS1 has avoided the interference to MS2 simultaneously, so MS2 is operated in CoMP united beam excipient pattern.In sum, seven kinds of combinations shown in the total table 1 of the MIMO pattern of base station support and CoMP type:
Table 1
Next introduce the CoMP transmission method basic procedure based on local scheduler of the present invention.Wherein, be transmitted as example so that a CoMP UE is carried out CoMP, suppose that this UE is UE A, the method comprises:
Step 101, UE A selects K residential quarter as measuring the residential quarter from the neighbor cell of this residential quarter, and according to MIMO pattern and the CoMP type that this residential quarter is supported, UE A reports the channel condition information CSI of this residential quarter and measurement residential quarter to the base station of this residential quarter; Wherein, described K is the constant of systemic presupposition.
Step 102, MIMO pattern and CoMP type that the base station of this residential quarter is supported according to this residential quarter, carrying out scheduling and the resource of UE A distributes, and determine to step 101 each measure cell transmission, the resource of distributing for described UE, the MIMO pattern that this residential quarter is supported and CoMP type and take running time-frequency resource at UE A and recommend the reference informations such as the corresponding resource of corresponding measurement residential quarter and CQI difference.
In this step, this cell base station distributes running time-frequency resource according to the information that UE A reports for this UE A, then, measure cell transmission to each and distribute to the running time-frequency resource of UE A, MIMO pattern and the CoMP type of this residential quarter support and resource and the CQI difference of recommending corresponding measurement residential quarter.Wherein, the MIMO pattern of this residential quarter support and CoMP type are one of five kinds of combinations corresponding to aforementioned table 1 small area edge customer (being CoMP UE).Sending to resource and the CQI difference of the recommendation of measuring the residential quarter, is to recommend the resource of measuring the residential quarter at the running time-frequency resource (being the running time-frequency resource that UE A takies) that this cell base station is distributed to UE A, comprises PMI or wave beam numbering, and the information such as CQI.
Step 103, each is measured the residential quarter and is defined as the CoMP type that UE A provides, and this residential quarter and each cooperation cell are UE A the transmission of data according to the CoMP type of determining.
Each measures the information that the residential quarter sends according to this cell base station in the step 102, and the MIMO pattern of self supporting and CoMP type, and determining whether provides CoMP service and CoMP type for UE A; The measurement residential quarter that provides CoMP to serve for UE A is the cooperation cell of UE A; Cooperation cell is carried out the synergistic data transmission of UE A with this residential quarter.
The above-mentioned describe, in general terms that is the inventive method has wherein provided among the present invention the CoMP transfer process based on local scheduler.In this flow process, the CoMP transmission with respect to the combined dispatching in the background technology has greatly reduced amount of information mutual between the base station.
Next, by a specific embodiment explanation specific implementation of the present invention.Particularly, still supposition treats that service-user is UE A, and the method flow in the present embodiment comprises:
Step 201 is judged user type, for CoMP UE, determines to measure the residential quarter.
In the present embodiment, can determine that at first service UE is edge customer or central user, if central user, then determine SU-MIMO or MU-MIMO mode according to the mode of prior art, for this UE provides data transport service, if edge customer then carries out the CoMP transmission according to the mode among the present invention.
Particularly, the co-channel interference that Cell Edge User is subject to is larger than Cell Center User, therefore this residential quarter that can report according to UE measurements, the base station (being this cell base station) of residential quarter, UE place and neighbor cell determine UE to the circuit loss value SINR of UE down direction SINR value whether above system's predefine thresholding, determine whether to be Cell Edge User.
The SINR computing formula is as follows:
P
i: the pilot tone transmitted power of i neighbor cell;
P
0: the pilot tone transmitted power of this residential quarter;
N: noise power;
L
i: cell i is to the path loss of UE.
When the SINR of UE value during greater than the thresholding α of systemic presupposition, judge that UE is Cell Edge User, otherwise, judge that UE is Cell Center User.After definite UE was Cell Edge User, this UE selected K the strongest residential quarter of reception pilot frequency intensity except this residential quarter, and as measuring the residential quarter, wherein, K is by default.
Step 202, UE A reports the CSI of this residential quarter and measurement residential quarter according to MIMO pattern and the CoMP type of this residential quarter support to the base station of this residential quarter.
For the back-up system side the time-frequently-scheduling decision on the null resource, UE needs the content of reporting status information of channel, there are 7 kinds in the system and mix the MIMO mode, the MIMO pattern of supporting according to UE position and this cell base station and CoMP type different, the CSI information content that UE need to report is also different.The below is introduced with regard to the CSI content that UE A in all kinds of situations reports respectively:
1. Cell Center User
Owing to do not need to consider the transmission with neighbor cell CoMP, only need to measure in real time the channel quality that reports in this residential quarter, to support time-frequency scheduling and the Adaptive Modulation and Coding (MCS) to UE.For the service of Cell Center User, be supported between SU-MIMO and the MU-MIMO and switch.
Zero cell base station is only supported the SU-MIMO pattern
The CSI that reports with UE among the LTE R8 is identical, and the information that UE A need to report comprises: the recommendering folder cell base station is used for the pre-coding matrix index (PMI) of this UE, and adopts the average CQI of total bandwidth behind this PMI and the CQI of each sub-frequency bands.
Zero cell base station is supported the MU-MIMO pattern
Different from SU-MIMO, the MU-MIMO support space is multiplexing, the PMI that UE A adopts when the recommendering folder cell base station is the UEA the transmission of data when reporting exclusive resource, and adopt outside the CQI of the average CQI of total bandwidth behind this PMI and each sub-frequency bands, UE A also needs to report the PMI that uses when the recommendering folder cell base station is for other user's the transmission of datas when matching with other users and matches rear UE A with other users and receives the CQI of signal and the CQI of each sub-frequency bands.Wherein, recommend other users' the PMI can be more than one, need to report corresponding CQI for each PMI that recommends other users.
2. Cell Edge User
This cell base station edge user's method of service is supported between 5 kinds of modes corresponding to the Cell Edge User shown in the table 1 to be switched.
The SU-MIMO pattern is only supported in zero this residential quarter
A, inter-cell united beam shaping (CB)
This cell channel status report is identical with LTE Rel 8:
PMI or wave beam numbering that ■ UEA reports the recommendering folder residential quarter to use.
The average CQI of the total bandwidth when ■ adopts this residential quarter UEA to recommend PMI or wave beam numbering and the CQI of each sub-frequency bands.
Each is measured the channel conditions report of residential quarter:
■ measures PMI or the wave beam numbering set (all the other are non-forbidding) of residential quarter forbidding.
When ■ adopted this residential quarter this recommendation PMI or wave beam numbering, UE received CQI difference (the Δ CQI of signal when measuring the residential quarter and using the PMI of non-forbidding on the identical running time-frequency resource or wave beam numbering with the PMI that adopts forbidding or wave beam numbering
0).
B, inter-cell united transmission (JP)
This cell information that UE need to report is identical with inter-cell united beam shaping.But inter-cell united transmission is cooperation cell, and to help this residential quarter be edge UE service, needs the channel conditions report of different measurement residential quarters, and the CSI that each that specifically reports measured the residential quarter comprises:
■ recommends to measure PMI or the set of wave beam numbering of adopting when joint transmission is carried out in the residential quarter.
The reception signal CQI of UE when ■ adopts this residential quarter this recommendation PMI or wave beam numbering, UE receives CQI difference (the Δ CQI of signal when carrying out joint transmission with the PMI that considers measurement residential quarter use UE recommendation or wave beam numbering
1).
Zero network side is supported the MU-MIMO pattern
A, inter-cell united beam shaping (CB)
Different from SU-MIMO, MU-MIMO supports spatial reuse in this residential quarter, and this cell channel situation that UE A reports comprises:
The PMI that the recommendering folder cell base station adopted when ■ UE A monopolized this local resource, and adopt the average CQI of total bandwidth behind this PMI and the CQI of each sub-frequency bands;
The PMI that the recommendering folder cell base station used for other users when ■ UEA and other users matched and match the CQI of rear UE A reception signal and the CQI of each sub-frequency bands with other users.Wherein, recommend other users' the PMI can be more than one, need to report corresponding CQI for each PMI that recommends other users.
The CSI that measures the residential quarter comprises:
■ measures PMI or the wave beam numbering set (other are non-forbidding) of residential quarter forbidding.
When this residential quarter of ■ adopts UEA to recommend the PMI of this cell base station or wave beam numbering to monopolize this local resource, measure the residential quarter use this cell allocation to the PMI of the upper non-forbidding of running time-frequency resource B of UE A or wave beam numbering during with the PMI that adopts the upper forbidding of running time-frequency resource B or wave beam numbering UE receive CQI difference (the Δ CQI of signal
0);
B, inter-cell united transmission (JP)
Different with inter-cell united beam shaping, inter-cell united transmission is that to help this residential quarter be edge UE service to cooperation cell.
This residential quarter CSI that UE need to report has:
The PMI that adopted the recommendering folder residential quarter when ■ UE A monopolized this local resource, and adopt the average CQI of total bandwidth behind this PMI and the CQI of each sub-frequency bands;
The PMI that the recommendering folder cell base station used other users when ■ UEA and other users matched and match rear UE A with other users and receive the CQI of signal and the CQI of each sub-frequency bands.Wherein, recommend other users' the PMI can be more than one, need to report corresponding CQI for each PMI that recommends other users.
The CSI that measures the residential quarter comprises:
■ recommends cooperation cell to carry out PMI or the set of wave beam numbering that joint transmission adopts;
This residential quarter of ■ adopts UE A to recommend that the PMI of this residential quarter or wave beam numbering monopolize that community associated transmission is not measured with other in this local resource and this residential quarter but the reception signal CQI of UE during the data of independent transmission UE A, and this residential quarter and measure the PMI that uses UE A to recommend to use separately in the residential quarter or the wave beam numbering when carrying out joint transmission UE receive difference (Δ CQI between the CQI of signal
1).
C, support united beam excipient and joint transmission (CB/JP) simultaneously
Under the MU-MIMO pattern, system can support united beam excipient and two kinds of cooperative modes of joint transmission simultaneously.
The information that UE reports in the time of need to measuring this residential quarter CSI of reporting with above united beam excipient and joint transmission is identical:
The PMI that the recommendation network side adopted when ■ UE A monopolized this local resource, and the average CQI that adopts total bandwidth behind this PMI, the CQI of sub-band;
The PMI that recommends other users to use when ■ UEA and other users match, and and other users match rear UE A and receive the CQI of signal and the CQI of each sub-frequency bands.Wherein, recommend other users' the PMI can be more than one, need to report corresponding CQI for each PMI that recommends other users.
The measurement residential quarter CSI that UE need report comprises:
■ measures PMI or the wave beam numbering set (other are non-forbidding) of residential quarter forbidding.
When this residential quarter of ■ adopts UE A to recommend PMI or wave beam numbering to monopolize this local resource, measure CQI difference (the Δ CQI that the PMI of the upper non-forbidding of running time-frequency resource (being the running time-frequency resource that UE A takies) of distributing to UE A or wave beam numbering are used in the residential quarter, UEA receives signal during with the PMI that adopts forbidding or wave beam numbering
0);
■ recommends to measure the residential quarter and carries out PMI or the set of wave beam numbering that joint transmission adopts;
The reception signal CQI of UE when this residential quarter of ■ adopts UE A to recommend the PMI of this residential quarter or wave beam numbering to monopolize this local resource, with this residential quarter and measure the residential quarter use UE A recommend separately PMI or the wave beam numbering when carrying out joint transmission UE receive CQI difference (the Δ CQI of signal
1).
Above-mentioned being in all cases, UE A feeds back to the CSI content of this cell base station.Specifically give the correct time carrying out above-mentioned CSI, for various situation, can adopt the unified message format that arranges.Particularly, in the message of feedback, UE type field, MIMO pattern field, CoMP type field and DCI field are set.Wherein, UE type field, MIMO pattern field and CoMP type field are respectively applied to carry the type (being edge customer or central user) of this UE, the MIMO pattern (being SU-MIMO or MU-MIMO) of this cell base station support and CoMP type (inter-cell united beam shaping or the inter-cell united transmission that this cell base station is supported, or, support simultaneously inter-cell united beam shaping and joint transmission); And determine the content of DCI field according to the concrete value of above-mentioned three fields.In more detail, under various UE types, MIMO pattern and the CoMP type, the theing contents are as follows of each field in the feedback message:
● Cell Center User, SU-MIMO
User-Type MIMO Mode DCI Info
| 0 | 0 | PMI | CQI/RI |
● Cell Center User, MU-MIMO
User-Type MIMO Mode DCI Info
| 0 | 1 | PMI 0 | CQI 0/RI | PMI 1 | CQI 1 |
● Cell Edge User, SU-MIMO, CB
[0143] User-Type MIMO Mode CoMP Mode DCI Info
[0144]
| 1 | 0 | 00 | PMI | CQI/RI | PMI (forbidding the adjacent cell use) | ΔCQI 0 |
● Cell Edge User, MU-MIMO, CB
[0146] User-Type MIMO Mode CoMP Mode DCI Info
[0147]
| 1 | 1 | 00 | PMI 0 | CQI 0/RI | PMI 1 | CQI 1 | PMI (forbidding the adjacent cell use) | ΔCQI 0 |
● Cell Edge User, SU-MIMO, JP
[0149] User-Type MIMO Mode CoMP Mode DCI Info
[0150]
| 1 | 0 | 10 | PMI | CQI/RI | PMI (recommending adjacent cell to use) | ΔCQI 1 |
● Cell Edge User, MU-MIMO, JP
[0152] User-Type MIMO Mode CoMP Mode DCI Info
[0153]
| 1 | 1 | 10 | PMI 0 | CQI 0/RI | PMI 1 | CQI 1 | PMI (recommending adjacent cell to use) | ΔCQI 1 |
● Cell Edge User, MU-MIMO, JP/CB
[0155] User-Type MIMO Mode CoMP Mode DCI Info
[0156]
| 1 | 1 | 11 | PMI | CQI/RI | PMI 1 | CQI 1 | PMI (forbidding the adjacent cell use) | ΔCQI 0 | PMI (recommending adjacent cell to use) | ΔCQI 1 |
Common feedback message format under above-mentioned various different MIMO patterns and the CoMP type (above-mentioned totally 7 kinds) has avoided the feedback message formats when the CoMP pattern is switched to change.
Want feedack as seen by above-mentioned UE A, under the CoMP pattern, UE need to feed back a large amount of CSI information, wherein not only comprises the CSI of this residential quarter, also comprises the CSI of other measurement residential quarters.Therefore, consider the numerous information that report, preferably, this residential quarter CSI information can be reported respectively with measurement residential quarter CSI.Particularly, this residential quarter reports simultaneously with measurement residential quarter CSI when PUCCH, PUSCH resource abundance; When resource-constrained, the report cycle of measuring residential quarter CSI can be larger, and CSI reports respectively with this residential quarter.
The above-mentioned mode that reports respectively is to the choice between CoMP performance and the up expense.CoMP is as the interference cancellation techniques that strengthens, and the poorest situation is to measure residential quarter CSI report cycle endless, and when the X2 interface ability was not limited, it was shorter to measure residential quarter CSI report cycle, and the CoMP performance is better, and up expense is larger.
Step 203, MIMO pattern and CoMP type that the base station of this residential quarter is supported according to this residential quarter are carried out scheduling and the resource of UE A and are distributed.
The control residential quarter is adopted identical dispatching method to central user with edge customer:
If this cell base station adopts the SU-MIMO mode, be that UE A selects suitable running time-frequency resource by the PMI of UE A recommendation and the buffer status of UE, UE monopolizes this running time-frequency resource.
If this cell base station adopts the MU-MIMO mode, at first seek the pairing user according to the PMI of UE A recommendation and the PMI (can be more than) that recommends other users to use for this UE, if find the pairing user, then distribute identical running time-frequency resource to them; If do not find the pairing user of UE A, then make this UE A monopolize a time-frequency resource.
For the center cell user, after carrying out the resource distribution, carry out transfer of data according to the mode of prior art, for the edge cell user, continue to carry out following steps and carry out the CoMP transmission.
Step 204, each that determine to step 201 measured cell transmission, the resource of distributing for UE A, the MIMO pattern that this residential quarter is supported and CoMP type and take the reference informations such as corresponding resource that running time-frequency resource is recommended corresponding measurement residential quarter at UE A.
With UE A feedback CSI info class in the abovementioned steps 202 seemingly, this cell base station also is with the different of CoMP type and to some extent difference of the MIMO pattern supported according to this residential quarter to the information of measuring cell transmission in this step.Next, in the various situations of classificating introduction, send to the information of measuring the residential quarter.
Zero network side is only supported the SU-MIMO pattern
1. inter-cell united beam shaping
For after UE A dispatched resource, this residential quarter will send cooperative information to measuring the residential quarter, comprise:
■ sends the running time-frequency resource that UE A takies in real time
■ sends in real time or periodically and recommends the measurement residential quarter to take PMI or the set of wave beam numbering that running time-frequency resource other UE of service (i.e. other UE except UE A) adopt at UE A;
When this residential quarter of ■ adopts PMI that UE A recommends or wave beam numbering to monopolize this local resource, measure the residential quarter and use CQI difference (the Δ CQI that UE A takies the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, UE A receives signal during with the PMI that adopts UE A to take to forbid on the running time-frequency resource or wave beam numbering
0); When the time-delay of X2 mouth is larger, send average CQI difference (Δ CQI with longer cycle
0);
2. inter-cell united transmission
This residential quarter is after edge UE has dispatched resource, and this residential quarter will send cooperative information to relevant adjacent cell, comprise:
■ sends the running time-frequency resource that UE A takies in real time;
■ sends in real time or periodically and recommends to measure PMI or the set of wave beam numbering of adopting when joint transmission is carried out to UE A in the residential quarter on this resource;
■ send in real time UEA when the PMI that recommends this residential quarter is adopted in this residential quarter or the wave beam numbering is monopolized this local resource and only this residential quarter sends data to UEA reception signal CQI, with this residential quarter and measure the residential quarter use UE A recommend separately PMI or the wave beam numbering when carrying out joint transmission UE A receive CQI difference (the Δ CQI of signal
1); When the time-delay of X2 mouth is larger, send average CQI difference (Δ CQI with longer cycle
1).
Zero network side is supported the MU-MIMO pattern
1. inter-cell united beam shaping
For after UEA dispatched resource, this residential quarter will send cooperative information to measuring the residential quarter, comprise:
■ sends the running time-frequency resource that UE A takies in real time;
■ sends in real time or periodically and forbids measuring PMI or the wave beam numbering set (all the other are non-forbidding) that other UE of running time-frequency resource service that the residential quarter takies at UEA adopt;
■ send in real time this residential quarter adopt PMI that UE A recommends or wave beam numbering monopolize this local resource or with other UE pairings after, measure the residential quarter use the PMI of non-forbidding on the running time-frequency resource that UE A takies or wave beam numbering, with the running time-frequency resource that adopts UE A to take on when the PMI forbidden or wave beam numbering UE receive CQI difference (the Δ CQI of signal
0); When the time-delay of X2 mouth is larger, send average CQI difference (Δ CQI with longer cycle
0);
2. inter-cell united transmission
This residential quarter is after UE A has dispatched resource, and this residential quarter will send cooperative information to measuring the residential quarter, comprise:
■ sends the running time-frequency resource that UE A takies in real time;
■ sends in real time or periodically and recommends to measure PMI or the set of wave beam numbering of adopting when joint transmission is carried out to UE in the residential quarter on the running time-frequency resource that UE A takies;
■ sends in real time that the PMI that recommends this residential quarter is adopted in this residential quarter or the wave beam numbering is monopolized this local resource or during with other UE pairings, with this residential quarter and measure the residential quarter use UE A recommend separately PMI or the wave beam numbering when carrying out joint transmission UE A receive CQI difference (the Δ CQI of signal
1); When the time-delay of X2 mouth is larger, send average CQI difference (Δ CQI with longer cycle
1).
3. support simultaneously inter-cell united beam shaping and joint transmission
For after UE A dispatched resource, this residential quarter will send cooperative information to measuring the residential quarter, comprise:
■ sends the running time-frequency resource that UE A takies in real time;
■ sends in real time or periodically and forbids measuring the residential quarter takies other UE employings of running time-frequency resource service at UE A PMI or wave beam numbering set (other are non-forbidding);
■ send in real time this residential quarter adopt UE A recommend the PMI of this residential quarter or wave beam numbering monopolize this local resource or with other UE pairings after, measure the residential quarter and use CQI difference (the Δ CQI that UE A takies the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, UE receives signal during with the PMI that adopts UEA to take to forbid on the running time-frequency resource or wave beam numbering
0); When the time-delay of X2 mouth is larger, send average CQI difference (Δ CQI with longer cycle
0);
■ sends in real time or periodically and recommends to measure the residential quarter and take on the running time-frequency resource PMI or the set of wave beam numbering of adopting when UEA carried out joint transmission at UE A;
■ send in real time this residential quarter adopt the PMI that recommends this residential quarter or wave beam numbering monopolize this local resource or and other UE pairings and when only this residential quarter is UE A signal transmission UE A receive the CQI of signal, difference (the Δ CQI with this residential quarter and when measuring the residential quarter and using PMI that UE recommends or wave beam numbering to carry out joint transmission between the CQI of UE A reception signal
1); When the time-delay of X2 mouth is larger, send average CQI difference (Δ CQI with longer cycle
1).
Above-mentioned being in all cases, this cell base station send to the information content of measuring the residential quarter.Wherein, the schematic diagram of various CQI differences as shown in Figure 6.Specifically when carrying out above-mentioned information transmission, for various situation, can adopt the unified message format that arranges.Particularly, CoMP type field and csi field are set in interference coordination message.Wherein, the CoMP type field is used for carrying the CoMP type that this cell base station supports (inter-cell united beam shaping or inter-cell united transmission, or, support simultaneously inter-cell united beam shaping and joint transmission); And determine the content of csi field according to the concrete value of this CoMP field.In more detail, under the various CoMP types, the theing contents are as follows of each field in the cooperation message:
[0197] ●MU-MIMO/SU-MIMO，CB
[0198] CoMP Mode CSI Info
| 00 | PMI (forbidding the adjacent cell use) | ΔCQI 0 orΔCQI 0 |
[0200] ●MU-MIMO/SU-MIMO，JP
[0201] CoMP Mode CSI Info
| 10 | PMI (recommending adjacent cell to use) | ΔCQI 1 orΔCQI 1 |
●MU-MIMO，JP/CB
CoMP Mode CSI Info
| 11 | PMI (forbidding the adjacent cell use) | ΔCQI 0 orΔCQI 0 | PMI (recommending adjacent cell to use) | ΔCQI 1 orΔCQI 1 |
Public message form under the above-mentioned various different CoMP types (above-mentioned totally 7 kinds) has been avoided the variation of the cooperation message format when the CoMP pattern is switched.
If this cell base station can be circulated a notice of disturbed condition to measuring the residential quarter in real time with the frequency of UE A feedback CSI, then measure the residential quarter and can in time make corresponding resource adjustment, the CoMP performance can guarantee so.But owing to be subject to X2 port transmission time delay (may because load is heavier or itself do not satisfy the CoMP delay requirement), the cooperation message sink is lagged behind, the variation of channel can not be in time followed in the interference control of minizone, probably makes systematic function obtain negative gain.
Therefore, preferably, system can be according to X2 mouth ability and load condition self adaptation adjustment cooperation transmission of messages cycle in the present embodiment.If the cooperation transmission of messages cycle, then will not send the CQI difference greater than the cycle of UE feedback CSI and will make average rear (Δ CQI
0→ Δ CQI
0Δ CQI
1→ Δ CQI
1) at the X2 port transmission.When X2 mouth limited ability, make presence of intercell interference control can follow the long-time quality of channel, X2 message is controlled in the performance loss that the hysteresis of reduction transmission of messages brings simultaneously makes expense.
Step 205 is measured the residential quarter according to up-to-date cooperation message, and determining whether provides CoMP service and the CoMP type that provides for UE A.
After the relevant information that sends in the above-mentioned steps 204 is received in the measurement residential quarter, determining whether provides the CoMP service for UE A, provide the CoMP service if be defined as UE A, then will be defined as UE A provides the measurement residential quarter of CoMP service to be called cooperation cell, and further determines the CoMP type that cooperation cell provides.Specifically determine whether to provide the mode of CoMP service and the CoMP type that provides can adopt various possible modes, present embodiment is not done regulation.But the cardinal principle principle of determining is as described below:
Only support that the CoMP type is inter-cell united beam shaping if measure the residential quarter, then measure the running time-frequency resource that the UE A use that comprises in this message will be avoided using in the residential quarter as far as possible, or PMI or wave beam numbering that UE A forbids are served other users; To use UE A to take available PMI or other users of wave beam numbering service that the UE A on the resource recommends as far as possible.
Only support that the CoMP type is inter-cell united transmission if measure the residential quarter, then measure the residential quarter receive the cooperation message after, the use of trying one's best is carried out joint transmission in PMI or wave beam numbering that UE A takies recommend adoption on the running time-frequency resource to UE A, or avoid using the running time-frequency resource identical with UE A.
Support simultaneously inter-cell united beam shaping and joint transmission if measure the residential quarter, after then measuring the residential quarter and receiving cooperation message, the running time-frequency resource that will avoid using the UE A that comprises in this information to use, or UE A PMI or other users of wave beam numbering service of forbidding; To use UE A to take available PMI or other users of wave beam numbering service that the UE A on the resource recommends, or PMI or the wave beam numbering of using UE A to recommend be carried out joint transmission to UE A as far as possible.
If cooperation cell is determined to provide the CoMP service take community associated transmission means as UE A, send in real time the cooperation response message to this cell base station.Message content comprises the running time-frequency resource position that joint transmission takies.This cell base station need to send to cooperation cell by wired carrying with data, transformat and the antenna end slogan that cooperation cell sends after receiving this interference cooperation response message.
Step 206, the CoMP type that this residential quarter and cooperation cell are determined according to step 205 is UE A the transmission of data.
During for the UE the transmission of data, if the CoMP type is the united beam excipient, the CQI in this residential quarter CSI information that this residential quarter reports according to described UE determines MCS; If the CoMP type is joint transmission, the CQI in this residential quarter CSI information that this residential quarter reports according to described UE and the Δ CQI in the cooperation cell CSI information
1Determine MCS.
So far, the method flow of present embodiment finishes.
By the specific implementation of the invention described above as seen, the present invention is based on the multi-point cooperative transmission scheme of local scheduler, compare with the transmission plan of combined dispatching device, local scheduling mode Signalling exchange amount is few, dispatching algorithm is simple, with the dynamic interference coordination scheme among the Rel-8 stronger compatibility is arranged, less on the standard impact, this patent has proposed specific implementation for local scheduling.
This scheme back-up system switches under different CoMP patterns flexibly, and unified UE feedback message formats and minizone cooperation message format under the various CoMP patterns avoided the variation of the message format when the CoMP pattern is switched.
The present invention proposes UE feedback message compression method and reduces the signaling consumption that UE measures reporting information; X2 mouth cooperation message compression methods has reduced X2 message makes expense, has reduced simultaneously the loss that systematic function is brought by the impact of X2 time delay.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. multi-point cooperative transmission method based on local scheduler is characterized in that the method comprises:
The UE of multi-point cooperative transmission CoMP selects K residential quarter as measuring the residential quarter from the neighbor cell of this residential quarter, and described UE reports the channel condition information CSI of this residential quarter and measurement residential quarter according to MIMO pattern and the CoMP type of this residential quarter support to the base station of this residential quarter; Wherein, described K is the constant of systemic presupposition;
The base station of described this residential quarter, MIMO pattern and CoMP type according to this residential quarter support, carry out the scheduling of described UE and resource and distribute, and take corresponding resource and the CQI difference that running time-frequency resource is recommended corresponding measurement residential quarter to each described measurement cell transmission is the described UE resource of distributing, this residential quarter is supported MIMO pattern and CoMP type and at described UE;
Each described measurement residential quarter takies corresponding resource and the CQI difference that running time-frequency resource is recommended corresponding measurement residential quarter according to described this residential quarter is the described UE resource of distributing, this residential quarter is supported MIMO pattern and CoMP type and at described UE, and determining whether provides CoMP service and the CoMP type that provides for described UE; This residential quarter and each provide the cooperation cell of CoMP service according to the described CoMP type that provides, and are described UE the transmission of data.
2. method according to claim 1 is characterized in that, K the strongest residential quarter of selective reception pilot frequency intensity from the neighbor cell of described this residential quarter is as measuring the residential quarter.
3. method according to claim 1 is characterized in that, when described base station is only supported SU-MIMO and is only supported inter-cell united beam shaping,
The CSI of this residential quarter that described UE reports comprises: the average CQI of total bandwidth and the CQI of each sub-frequency bands when described PMI or wave beam numbering are adopted in the pre-coding matrix index PMI that use the recommendering folder residential quarter or wave beam numbering, this residential quarter;
The CSI of the measurement residential quarter that described UE reports comprises: PMI or the set of wave beam numbering of measuring the residential quarter forbidding; With, when the PMI that use this employing recommendering folder residential quarter, residential quarter or wave beam numbering, measure the residential quarter use described UE take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, during with the PMI that adopts described UE to take to forbid on the running time-frequency resource or wave beam numbering, UE receives the CQI difference △ CQI of signal
0
4. method according to claim 1 is characterized in that, when described base station is only supported SU-MIMO and is only supported inter-cell united transmission,
The CSI of this residential quarter that described UE reports comprises: the average CQI of total bandwidth and the CQI of each sub-frequency bands when described PMI or wave beam numbering are adopted in the PMI that use the recommendering folder residential quarter or wave beam numbering, this residential quarter;
The channel condition information of the measurement residential quarter that described UE reports comprises: recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out in the residential quarter; The reception signal CQI of UE when adopting PMI that recommendering folder residential quarter uses or wave beam numbering to carry out transfer of data separately with, this residential quarter, the difference △ CQI between the described UE reception signal CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission
1
5. method according to claim 1 is characterized in that, when described base station is supported MU-MIMO and is only supported inter-cell united beam shaping,
The channel condition information of this residential quarter that described UE reports comprises: the average CQI of total bandwidth and the CQI of each sub-frequency bands behind the PMI that adopted the recommendering folder residential quarter when UE monopolized this local resource, the described PMI of employing; The PMI that use other each pairing user the recommendering folder residential quarter when matching with, UE and other users and match rear described UE with other each pairing user and receive the CQI of signal and the CQI of each sub-frequency bands;
The channel condition information of the measurement residential quarter that described UE reports comprises: PMI or the set of wave beam numbering of measuring the residential quarter forbidding; With, this residential quarter adopts the PMI of recommendering folder residential quarter or wave beam to number when monopolizing this local resource, measure the residential quarter use described UE take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, during with the PMI that adopts described UE to take to forbid on the running time-frequency resource or wave beam numbering, UE receives the CQI difference △ CQI of signal
0
6. method according to claim 1 is characterized in that, when described base station is supported MU-MIMO and is only supported inter-cell united transmission,
The channel condition information of this residential quarter that described UE reports comprises: the PMI that adopted the recommendering folder residential quarter when UE monopolized this local resource and adopt described PMI after the average CQI of total bandwidth and the CQI of each sub-frequency bands; With, the PMI that used other each pairing user the recommendering folder residential quarter when UE and other users matched and match rear described UE with other each pairing user and receive the CQI of signal and the CQI of each sub-frequency bands;
The channel condition information of the cooperation cell that described UE reports comprises: recommend to measure the residential quarter and carry out PMI or the set of wave beam numbering that joint transmission adopts; The reception signal CQI of UE when adopting PMI that recommendering folder residential quarter uses or wave beam numbering to monopolize this local resource to carry out transfer of data separately with, this residential quarter, the difference △ CQI between the described UE reception signal CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission
1
7. method according to claim 1 is characterized in that, when described base station is supported MU-MIMO and is supported simultaneously minizone beam shaping and joint transmission,
The channel condition information of this residential quarter that described UE reports comprises: the PMI that adopted the recommendering folder residential quarter when UE monopolized this local resource and adopt described PMI after the average CQI of total bandwidth and the CQI of each sub-frequency bands; The PMI that use other each pairing user the recommendering folder residential quarter when matching with, UE and other users and match rear described UE with other each pairing user and receive the CQI of signal and the CQI of each sub-frequency bands;
The channel condition information of the measurement residential quarter that described UE reports comprises: PMI or the set of wave beam numbering of measuring the residential quarter forbidding; With, this residential quarter adopts the PMI of recommendering folder residential quarter or wave beam to number when monopolizing this local resource, measure the residential quarter use described UE take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering, during with the PMI that adopts described UE to take to forbid on the running time-frequency resource or wave beam numbering, UE receives the CQI difference △ CQI of signal
0With, recommend to measure the residential quarter and carry out PMI or the set of wave beam numbering that joint transmission adopts; The reception signal CQI of UE when adopting PMI that recommendering folder residential quarter uses or wave beam numbering to monopolize this local resource to carry out transfer of data separately with, this residential quarter, the difference △ CQI between the UE reception signal CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission
1
8. method according to claim 1, it is characterized in that, when described base station was only supported SU-MIMO and only supported inter-cell united beam shaping, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise:
The PMI that other UE of running time-frequency resource service that recommend the measurement residential quarter to take at described UE adopt or the set of wave beam numbering; With,
When this residential quarter adopts PMI that described UE recommends or wave beam numbering to monopolize this local resource, when measuring the residential quarter and using described UE to take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering described UE receive the CQI of signal, the difference △ CQI during with the PMI that uses described UE to take to forbid on the running time-frequency resource or wave beam numbering between the CQI of described UE reception signal
0
9. method according to claim 1, it is characterized in that, when described base station was only supported SU-MIMO and only supported inter-cell united transmission, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise:
Recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out to described UE in the residential quarter on the running time-frequency resource that described UE takies; With,
The CQI of the reception signal of UE when this residential quarter adopts the PMI of recommendering folder residential quarter or wave beam numbering to monopolize this local resource to carry out the independent data transmission, the difference △ CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission between the CQI of described UE reception signal
1
10. method according to claim 1, it is characterized in that, when described base station was supported MU-MIMO and only supported inter-cell united beam shaping, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding cooperation cell and comprise:
Take running time-frequency resource at described UE and measure PMI or the set of wave beam numbering of forbidding when other UE are served in the residential quarter; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or with other UE pairings after, when measuring the residential quarter and using described UE to take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering described UE receive the CQI of signal, the difference △ CQI during with the PMI that uses described UE to take to forbid on the running time-frequency resource or wave beam numbering between the CQI of described UE reception signal
0
11. method according to claim 1, it is characterized in that, when described base station was only supported MU-MIMO and only supported inter-cell united transmission, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise:
Recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out to described UE in the residential quarter on the running time-frequency resource that described UE takies; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or and other UE pairings and when only this residential quarter is to described UE the transmission of data described UE receive the CQI of signal, the difference △ CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission between the CQI of described UE reception signal
1
12. method according to claim 1, it is characterized in that, when described base station was supported MU-MIMO and supported simultaneously inter-cell united beam shaping and joint transmission, described base station sends to described measurement residential quarter took running time-frequency resource at described UE and recommends corresponding resource and the CQI difference of corresponding measurement residential quarter and comprise:
Take running time-frequency resource at described UE and measure PMI or the set of wave beam numbering of forbidding when other UE are served in the residential quarter; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or with other UE pairings after, when measuring the residential quarter and using described UE to take the PMI of non-forbidding on the running time-frequency resource or wave beam numbering described UE receive the CQI of signal, the difference △ CQI during with the PMI that uses described UE to take to forbid on the running time-frequency resource or wave beam numbering between the CQI of described UE reception signal
0
With, recommend to measure PMI or the set of wave beam numbering adopted when joint transmission is carried out to described UE in the residential quarter on the running time-frequency resource that described UE takies; With,
This residential quarter adopt PMI that recommendering folder residential quarter uses or wave beam numbering monopolize this local resource or and other UE pairings and when only this residential quarter is to described UE the transmission of data described UE receive the CQI of signal, the difference △ CQI with this residential quarter and when measuring the residential quarter and using described UE to recommend the PMI that uses separately or wave beam numbering to carry out joint transmission between the CQI of described UE reception signal
1
13. arbitrary described method in 7 is characterized in that according to claim 3, under different MIMO patterns and CoMP type, described UE adopts the unified message format that arranges when reporting this residential quarter and measuring residential quarter CSI.
14. method according to claim 13 is characterized in that, described UE reports the CSI of this residential quarter and the CSI of measurement residential quarter respectively, and the report cycle of the channel condition information of this residential quarter is equal to or less than the report cycle of the channel condition information of measuring the residential quarter.
15. arbitrary described method in 12 according to claim 8, it is characterized in that, under different MIMO patterns and CoMP type, the message format of the Resources allocation that described base station sends to the measurement residential quarter, the MIMO pattern of support and CoMP type, the unified setting of employing when measuring residential quarter CSI.
16. method according to claim 15, it is characterized in that, if described base station sends the cycle of measurement message greater than the cycle of described UE reporting measurement residential quarter CSI to measuring the residential quarter, when then described base station sends cooperation message to the measurement residential quarter, with all △ CQI that do not send
1Send after average, with all △ CQI that do not send
0Send after average.
17. method according to claim 1, it is characterized in that, when the CoMP type that is defined as described UE and provides when arbitrary described measurement residential quarter was inter-cell united transmission, the method further comprised: will the cooperate time frequency space resource used of this measurement residential quarter feeds back to the base station of described this residential quarter; Described cell base station sends to this cooperation cell with data, transformat and the antenna end slogan that this cooperation cell sends.
18. according to claim 4,6,7,9,11 or 12 described methods, it is characterized in that, during for the UE the transmission of data, if the described CoMP type that provides is the multi-plot joint beam shaping, the CQI in this residential quarter CSI information that this residential quarter reports according to described UE determines MCS; If the described CoMP type that provides is multi-plot joint transmission, the CQI in this residential quarter CSI information that this residential quarter reports according to described UE and the △ CQI in the cooperation cell CSI information
1Determine MCS.
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