CN102281643B - Method for same base station to make multi-cell system distribute downlink resources - Google Patents
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Abstract
The invention provides a method for a same base station to make multi-cell system distribute downlink resources. The downlink resources of a service cell are divided into a priority scheduling resource and a residual scheduling resource which are distributed for a user in the service cell. For the priority scheduling resource, a zero forcing wave beam forming technology is adopted; precoding is performed to the user who need to be scheduled in the priority scheduling resource based on PMI and CQI reported by the user according to a proportional fair principle; the scheduling user and the priority scheduling resource distributed for the scheduling user are acquired. For the residual scheduling resource, a collaboration user is determined according to the CQI reported by the user and collaboration information; the zero forcing wave beam forming technology is adopted; the precoding is performed to the collaboration user and the user who are not being scheduled according to the proportional fair principle; the residual scheduling resource is distributed so as to prevent from interference of an adjacent cell. By using the method of the invention, a data volume of downlink channel detection information reported by the user can be reduced and a calculated amount is reduced too.
Description
Technical field
The present invention relates to mobile communication technology, particularly the method for multi-cell system allocation of downlink resource is controlled in a kind of same base station.
Background technology
In next generation mobile communication system, adopted orthogonal frequency (OFDM) as downlink multi-access access technology, improve the availability of frequency spectrum.In this mobile communication system, the scheduling downlink resource of a plurality of communities can be controlled in same base station, and the plurality of community is neighbor cell each other.Each cell configuration has many dual-mode antennas, and the user in each community also disposes many dual-mode antennas, when each community is user assignment downlink resource, adopts precoding technique.
In same base station, control in multi-cell system, each community that same base station is controlled is assigned identical frequency band, the different districts that same base station is controlled adopts sub-bands different under this frequency band as boss's frequency band, adopts remaining frequency band as auxiliary sub-band, carries out the distribution of downlink resource.
A plurality of communities of controlling with base station are respectively when carrying out the scheduling downlink resource of auxiliary sub-band, and boss's frequency band that can distribute its neighbor cell or auxiliary sub-band cause interference (both may be same sub-band, produce co-channel interference).As shown in Figure 1, Fig. 1 is that multi-cell system schematic diagram is controlled in same base station: You Sange community in figure, and the user UE administering to some extent in each community, user UE can be subject to neighbor cell interference.Particularly, as shown in Figure 2, the interference schematic diagram of neighbor cell when Fig. 2 is same base station control multi-cell system, the frequency band of wherein giving San Ge community is divided into three sub-frequency bands, in single cell scheduling Shi， community 0,1 and 2, adopt respectively different sub-bands as the boss's frequency band of self, while dispatching in cooperation cell, just using not as the sub-band of boss's frequency band as community 0,1 and 2 auxiliary sub-band dispatch, this can produce and disturb its neighbor cell.
The presence of intercell interference of controlling in order to solve same base station, has proposed coordinate multipoint (CoMP) technology.Coordinate multipoint technology can be eliminated the presence of intercell interference that same base station is controlled from spatial domain, improve the Cell Edge User transmission performance of controlling same base station.Specifically, coordinate multipoint technology can be divided into two classes: Combined Treatment and cooperative scheduling/cooperative beam figuration (CS/CB), wherein, the principle of cooperative scheduling/cooperative beam figuration is by Serving cell, be that current administration user's community adopts the downlink resource that distributes to send downlink data for user, a plurality of communities of being controlled by same base station are by shared channel transmission information, carry out cooperative scheduling and precoding processing, to reduce this user other neighbor cells interference problem to it while being positioned at edge, Serving cell.
User's downlink data receiving intensity of administering this community while carrying out cooperative scheduling/cooperative beam figuration, need to be optimized in each community of controlling for same base station simultaneously, reduces the user that neighbor cell is administered and disturbs.In order to reach this object, each community that same base station is controlled is when being administered user assignment downlink resource, employing is leaked and is made an uproar than the cooperation precoding technique of (SLNR) criterion based on letter, and the ratio of interference value is caused in the user received signal intensity that SLNR criterion is Serving cell and neighbor cell to this user.When adopting SLNR criterion, need to be subject to the reporting of user down channel correlation matrix of neighbor cell interference, just can make Serving cell according to SLNR criterion, carry out precoding, allocation of downlink resource.
Adopting said method is the user assignment downlink resource in each community of controlling, same base station, exist shortcoming: the user that 1) the method need to be subject to neighbor cell interference reports detailed down channel to detect information to Serving cell, be down channel correlation matrix, additionally take a large amount of ascending resources; 2) in the cooperation precoding process based on SLNR criterion, computation complexity is higher, and the non-ideal characteristic of the down channel that downlink resource is adopted is comparatively responsive.
Summary of the invention
In view of this, the invention provides a kind of same base station and control the method for multi-cell system allocation of downlink resource, the method is in the situation that reducing the data volume of reporting of user down channel detection information and reduce amount of calculation in precoding process, for user assignment downlink resource, and eliminate the interference of neighbor cell to user.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
The method of multi-cell system allocation of downlink resource is controlled in a kind of same base station, the different districts that same base station is controlled adopts sub-bands different under same frequency band as boss's frequency band, adopt remaining frequency band as auxiliary sub-band, carry out respectively the distribution of priority scheduling resource and the distribution of residue scheduling resource, the method comprises:
For priority scheduling resource, each community is precoding matrix indicators PMI and the channel quality indicator (CQI) according to reporting of user according to proportional fairness principle, adopt zero-forcing beamforming technology, in priority scheduling resource, the user that will dispatch is carried out to precoding, obtain dispatched users and be the priority scheduling resource of dispatched users distribution;
For residue scheduling resource, collaboration user is determined according to the CQI of reporting of user and cooperative information in each community, and adopting zero-forcing beamforming technology is that collaboration user and the user that will dispatch carry out precoding according to proportional fairness principle, distributes residue scheduling resource.
Described each community is PMI and the CQI according to reporting of user according to proportional fairness principle, adopt zero-forcing beamforming technology, in priority scheduling resource, the user that will dispatch is carried out to precoding, obtain dispatched users and for the process of the priority scheduling resource of dispatched users distribution be:
Each community is according to a user of proportional fairness principle scheduling, determine whether as user to be saved, if, according to the PMI of this reporting of user to be saved, the code book that inquiry arranges in priority scheduling resource carries out precoding, as this user's to be saved downlink resource, described in user to be saved for can not get the user of community service within the time period of setting; Otherwise, adopt zero-forcing beamforming technology that priority scheduling resource is distributed to remaining users.
Described definite user's to be saved process is:
Within the time period of setting, according to determining each user in the CQI of reporting of user, in down channel, transmit the average throughput of data, the average throughput that transmits data according to each user in down channel sorts from small to large, using the user of front setting number as user to be saved.
The process that described employing zero-forcing beamforming technology is distributed to remaining users by priority scheduling resource is:
During k+1 remaining users of each cell scheduling, k is natural number, according to corresponding relation, the PMI that the PMI that k+1 remaining users reported and dispatched users report is converted to after corresponding precoding vector matrix, adopt zero-forcing beamforming principle to obtain each user's precoding vector, according to the CQI of k+1 remaining users and modulated degree reporting of user, calculate k+1 remaining users and the overall transmission rate of dispatched users, if any overall transmission rate is lower than the overall transmission rate of dispatched users, adopt this precoding vector as the resource of distributing in priority scheduling resource, otherwise, select the candidate user of overall transmission rate maximum as k+1 remaining users, determine whether as user to be saved, if so, adopt this corresponding precoding vector obtaining as the resource of distributing in priority scheduling resource, if not, continue scheduling remaining users, until select total transmitting data stream number, equal the maximum transmission data stream that this priority scheduling resource can be supported, precoding vector corresponding during using this remaining users of scheduling is as the resource of distributing in priority scheduling resource.
Describedly according to the CQI of reporting of user and cooperative information, determine that the process of collaboration user is:
According to the cooperative information that needs of reporting of user, determine, when the difference of measuring the pilot signal received power RSRP of Serving cell and interfered cell as user is less than predefined threshold value, to Serving cell, reports and need cooperative information.
Described employing zero-forcing beamforming technology is that collaboration user and the user that is not scheduled carry out precoding according to proportional fairness principle, distributes the process of residue scheduling resource to be:
Each community, according to proportional fairness principle, adopts close-to zero beam principle, according to the PMI of collaboration user transmission, PMI and the residue scheduling resource that remaining users sends, determines remaining users and the remaining users distribution surplus resources for dispatching that will dispatch.
The method further comprises:
When first remaining users of scheduling, the PMI that the PMI reporting according to first remaining users and collaboration user report, obtains corresponding precoding vector matrix, according to zero-forcing beamforming principle, try to achieve after the pseudoinverse of this matrix, get first row vector, normalization obtains candidate's precoding vector;
The instantaneous transmission speed of remaining users is calculated in each community, according to proportional fairness principle, select one of them as the 1st candidate user, if this candidate user is user to be saved, finish to select, use this candidate's precoding vector obtaining as the surplus resources distributing for remaining users;
When k+1 remaining users of scheduling, according to the PMI of k+1 reporting of user and the PMI that dispatched users has reported be converted to corresponding precoding vector matrix, according to zero-forcing beamforming principle, try to achieve after the pseudoinverse of this matrix, get k+1 column vector, normalization obtains candidate's precoding vector;
Each community is according to the CQI of k+1 user and modulated degree reporting of user, calculate k+1 remaining users and the overall transmission rate of dispatched users, if any overall transmission rate is all lower than the overall transmission rate of dispatched users, the candidate's precoding vector obtaining while adopting k user of scheduling is as the surplus resources distributing for remaining users; Otherwise, select the candidate user of overall transmission rate maximum as k+1 remaining users, determine whether as user to be saved, if so, adopt this candidate's precoding vector obtaining as the surplus resources distributing for remaining users; If not, continue scheduling remaining users, until select total transmitting data stream number, equal this priority scheduling resource and carve the maximum transmission data fluxion of supporting and equal until select total transmitting data stream number the maximum transmission data stream that this priority scheduling resource can be supported, during using this remaining users of scheduling, corresponding candidate's precoding vector is the surplus resources that remaining users is distributed as distributed resource.
When not defining collaboration user, the method also comprises:
The PMI that each community reports according to remaining users according to proportional fairness principle and CQI, adopt zero-forcing beamforming technology, in residue scheduling resource, the user that will dispatch is carried out to precoding, obtains dispatched users and be the residue scheduling resource of dispatched users distribution.
Before remaining scheduling resource, the method also comprises:
Base station judges whether that the priority scheduling resource of each controlled community is assigned to dispatched users, if so, carries out the distribution of residue scheduling resource, otherwise, return to the allocation step of carrying out priority scheduling resource.
From such scheme, can find out, the downlink resource of Serving cell is divided into priority scheduling resource in the present invention and residue scheduling resource is the user assignment in Serving cell: for priority scheduling resource, it is boss's frequency band of Serving cell, adopt zero-forcing beamforming technology, precoding matrix indicators (PMI) and channel quality indication (CQI) according to proportional fairness principle according to reporting of user, in priority scheduling resource, the user that will dispatch is carried out to precoding, the priority scheduling resource that obtains dispatched users and distribute for dispatched users; For residue scheduling resource, it is the auxiliary sub-band of Serving cell, can be subject to the interference of neighbor cell, according to the CQI of reporting of user and cooperative information, determine collaboration user, adopt zero-forcing beamforming technology, according to proportional fairness principle, be that collaboration user and the user that is not scheduled carry out precoding, distribute residue scheduling resource, prevent from being subject to the interference of neighbor cell.In this scheme, the user of Serving cell only reports the descending channel informations such as PMI and CQI, is subject to the user of neighbor cell interference without report down channel correlation matrix to Serving cell, so reduced the data volume of reporting of user down channel detection information; Serving cell, when being user assignment priority scheduling resource and residue scheduling resource, obtains corresponding precoding vector matrix computations according to code book, and amount of calculation is fewer.
Accompanying drawing explanation
Fig. 1 is that multi-cell system schematic diagram is controlled in same base station;
The interference schematic diagram of neighbor cell when Fig. 2 is same base station control multi-cell system;
Fig. 3 is the method flow diagram that multi-cell system allocation of downlink resource is controlled in same base station provided by the invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
From prior art, can find out, for each community of same base station control, carry out downlink resource and divide timing, realize coordinate multipoint, so this each community has adopted the cooperation precoding technique of SLNR criterion, and adopt this Technology Need to be subject to the reporting of user down channel correlation matrix of neighbor cell interference, and the amount of calculation of precoding process is larger.In order to overcome the problems referred to above, the present invention adopted by the downlink resource of Serving cell be divided into priority scheduling resource and residue scheduling resource be the user assignment in Serving cell: for priority scheduling resource, it is boss's frequency band of Serving cell, PMI and CQI according to proportional fairness principle according to reporting of user, in priority scheduling resource, carry out precoding, the priority scheduling resource that obtains dispatched users and distribute for dispatched users; For residue scheduling resource, it is the auxiliary sub-band of Serving cell, can be subject to the interference of neighbor cell, according to the CQI of reporting of user and cooperative information, determine collaboration user, adopt zero-forcing beamforming technology, according to proportional fairness principle, be that collaboration user and the user that is not scheduled carry out precoding, distribute residue scheduling resource, prevent from being subject to the interference of neighbor cell.
In the present invention, each community that same base station is controlled is assigned identical frequency band, the different districts that same base station is controlled adopts sub-bands different under this frequency band as boss's frequency band, adopts remaining frequency band as auxiliary sub-band, carries out the scheduling of downlink resource.Therefore, for each community, be all divided into two processes and carry out the distribution of downlink resource, one is the downlink resource distribution of boss's frequency band, is called the distribution of priority scheduling resource, and another is the distribution of auxiliary sub-band downlink resource, is called the distribution of surplus resources.
In the present invention, related to a plurality of technical name, for better understanding, first these technical name have been explained.
Serving cell, the i.e. community at the current place of user;
Adjacent community, ，Ji Yu Serving cell, neighbor cell;
Dispatched users, has distributed the user of downlink resource;
Candidate user, just the user of allocation of downlink resource;
Remaining users, the i.e. user of unallocated downlink resource also;
In user ，Ji to be saved community in setting-up time section the poor user of channel quality;
Collaboration user, is subject to neighbor cell interference and is user's to be saved user.
Fig. 3 is the method flow diagram that multi-cell system allocation of downlink resource is controlled in same base station provided by the invention, take one of them Serving cell allocation of downlink resource is elaborated as example, be divided into preferential resource allocation process in Serving cell and the surplus resources assigning process of Serving cell, its concrete steps are:
The preferential resource allocation process of Serving cell:
Step 301, community receives CQI and the PMI of the user that administers of institute transmission;
In this step ，CQIShi user that community is administered after measuring downstream signal, obtain and send to community;
In this step, PMIWei Zhe community is to the designator corresponding to right Singular Pseudo inverse vector of user's down channel correlation matrix, this corresponding relation obtains according to predefined code book, this code book all arranges user and community, PMI is that user obtains by measuring the downlink channel condition information pilot tone (CSI-RS) of community, obtaining and calculating of PMI is all prior art, repeats no more here;
Step 302, Serving cell, according to a user of proportional fairness principle scheduling, determine that whether this user is user to be saved, and if so, performs step 303; Otherwise, perform step 304;
In this step, user to be saved is exactly within a period of time, can not get the user of Serving cell service because down channel quality is poor, and Serving cell determines that user's to be saved method is:
Within the time period of setting, according to determining each user in the CQI of reporting of user, in down channel, transmit the average throughput of data, the average throughput that transmits data according to user that Serving cell is administered in down channel sorts from small to large, using the user of front setting number as user to be saved;
In this step, user to be saved is mainly Serving cell edge customer or center, Serving cell but is subject to the user of strong shadow influence of fading, these users' down channel quality itself is poor, if other users that administer with Serving cell carry out transfer of data simultaneously on down channel, by further degrade performance;
Step 303, Serving cell are according to the PMI of this reporting of user to be saved, and the code book that inquiry arranges in priority scheduling resource carries out precoding, as this user's to be saved downlink resource;
Step 304, Serving cell scheduling remaining users, distribute to remaining users by priority scheduling resource;
In this step, concrete distribution method is: during k+1 remaining users of cell scheduling, according to corresponding relation, the PMI that the PMI that k+1 remaining users reported and dispatched users report is converted to after corresponding precoding vector matrix, adopt zero-forcing beamforming principle to obtain each user's precoding vector, according to the CQI of k+1 remaining users and modulated degree reporting of user, calculate k+1 remaining users and the overall transmission rate of dispatched users, if any overall transmission rate is lower than the overall transmission rate of dispatched users, adopt this precoding vector as the resource of distributing in priority scheduling resource, otherwise, select the candidate user of overall transmission rate maximum as k+1 remaining users, determine whether as user to be saved, if so, adopt this corresponding precoding vector obtaining as the resource of distributing in priority scheduling resource, if not, continue scheduling remaining users, until select total transmitting data stream number, equal the maximum transmission data stream that this priority scheduling resource can be supported, precoding vector corresponding during using this remaining users of scheduling is as the resource of distributing in priority scheduling resource,
Step 305, Serving cell determine whether priority scheduling resource has all been assigned with, and if so, perform step 306; Otherwise, return to step 302 and carry out;
Step 306, Serving cell determine whether priority scheduling resource has distributed to the collaboration user of community, if so, perform step 307; If not, perform step 308;
In this step, the collaboration user process of determining Serving cell is: according to the cooperative information that needs of reporting of user, determine, when the difference of measuring the pilot signal received power (RSRP) of Serving cell and interfered cell as user is less than predefined threshold value, will reports and need cooperative information to Serving cell;
Step 307, Serving cell, according to proportional fairness principle, adopt close-to zero beam principle, and the PMI that the PMI sending according to collaboration user, remaining users send and surplus resources are determined the remaining users that will dispatch and be that the remaining users that will dispatch is distributed surplus resources;
The detailed process of this step is: when first remaining users of scheduling, the PMI that the PMI reporting according to first remaining users and collaboration user report, obtain corresponding precoding vector matrix, according to zero-forcing beamforming principle, try to achieve after the pseudoinverse of this matrix, get first row vector, normalization obtains candidate's precoding vector.The instantaneous transmission speed of remaining users is calculated in Serving cell, according to proportional fairness principle, select one of them as the 1st candidate user, if this candidate user is user to be saved, finish to select, use this candidate's precoding vector obtaining as the surplus resources distributing for remaining users;
When k+1 remaining users of scheduling, according to the PMI of k+1 reporting of user and the PMI that dispatched users has reported be converted to corresponding precoding vector matrix, according to zero-forcing beamforming principle, try to achieve after the pseudoinverse of this matrix, get k+1 column vector, normalization obtains candidate's precoding vector.Serving cell is according to the CQI of k+1 user and modulated degree reporting of user, calculate k+1 remaining users and the overall transmission rate of dispatched users, if any overall transmission rate is all lower than the overall transmission rate of dispatched users, the candidate's precoding vector obtaining while adopting k user of scheduling is as the surplus resources distributing for remaining users; Otherwise, select the candidate user of overall transmission rate maximum as k+1 remaining users, determine whether as user to be saved, if so, adopt this candidate's precoding vector obtaining as the surplus resources distributing for remaining users; If not, continue scheduling remaining users, until select total transmitting data stream number, equal this priority scheduling resource and carve the maximum transmission data fluxion of supporting and equal until select total transmitting data stream number the maximum transmission data stream that this priority scheduling resource can be supported, during using this remaining users of scheduling, corresponding candidate's precoding vector is the surplus resources that remaining users is distributed as distributed resource;
Step 308, Serving cell be according to the proportional fairness principle of administered remaining users and residual resource information, determines the remaining users that will dispatch and to the surplus resources of this user assignment that will dispatch;
In this step, detailed process is identical with the assigning process that carries out priority scheduling resource, only in surplus resources, distributes, and repeats no more here;
Step 309, community determines whether that all resources have all been assigned with, if so, and process ends, otherwise, return to step 306 and continue to carry out.
In the present invention, each community that same base station is administered adopts the process of Fig. 3 to carry out the distribution of downlink resource, before the distribution of descending residue scheduling resource is carried out in each community, base station can judge whether that the descending priority scheduling resource of all communities all distributes, and the user in each community has been given in indication, if so, carry out again the distribution of the descending surplus resources of each community of administering.
The present invention will be described for object lesson of tool.
First, suppose that a base station controls a plurality of communities simultaneously, the downlink resource that this base station can be distributed is divided into N group, has priority scheduling resource group in every group of resource, and different resource group has different priority scheduling resource groups.In like manner, different districts is also corresponding to different priority scheduling resource groups.When coordinated scheduling is carried out to downlink resource in a plurality of communities of controlling in same base station, assignment information and the transformat of priority scheduling resource group are determined in each community first, and then the resource allocation conditions based on this priority scheduling resource group, remain the distribution of downlink resource.
Cell i, (i=0,1 ..N-1), corresponding priority scheduling group is expressed as:
Wherein, N
rBthe number of the total Physical Resource Block that can use for downlink transfer;
under expression, round;
Secondly, within dispatching cycle, the downlink resource of each community is assigned as:
1) determine assignment information and the transformat of this community priority scheduling resource.
1.1Zhe community arranges resource count device T0.The resource count device T0 of cell i is initialized as
1.2Zhe community is according to the downlink channel condition information of user's proportional fairness principle and reception, determines dispatched users and distributes to the downlink resource transport format information of this dispatched users, namely pre-coding matrix.
Here, downlink channel condition information comprises CQI and the PMI that in this community, user feeds back, and PMI has represented the right singular vector of cell i to mobile terminal j channel matrix, is calculated as follows:
Wherein, H
ij(f) be the channel of cell i to user j; The right singular vector that rsv (A) is matrix; S is the subcarrier set of this channel.Obtain v
ijafter, user selects the vector of quantization error minimum from the code book arranging
by vector
designator feed back to cell i.Code book wherein should be the enhancing code book of 3GPP LTE, can be identical with the code book of supporting user to transmit in rel 10.
When cell i is user assignment downlink resource, according to equity criterion, dispatch an arbitrary user UE
1if, user UE
1for the user to be saved of this cell i, cell i is inquired about code book, by user UE
1the precoding vector corresponding to PMI of feedback, as this user's transmission precoding vector, then proceeds to step 1.2 and continues to carry out, otherwise, dispatch remaining users;
The process of scheduling remaining users is: when k+1 user of scheduling, and the code book that first inquiry arranges, the transmitting antenna after being quantized respectively arrives the right singular vector of channel between dispatched users
and to candidate user UE
k+1, mm=1 ... the right singular vector of channel between M (the candidate user number that M is cell i)
form equivalent channel matrix
according to zero-forcing beamforming method, obtain the precoding vector of remaining users.
Calculate the overall transmission rate of dispatched users and candidate user, if this overall transmission rate lower than the overall transmission rate of dispatched users, end user scheduling, and use precoding vector that the k time scheduling obtain as transmission pre-coding matrix, enters 2.1.3; Otherwise, select the candidate user of overall transmission rate maximum as k+1 dispatched users, if k+1 the user Wei Zhe community user to be saved who selects finishes mobile terminal scheduling, use the precoding vector of this scheduling generation as sending precoding vector, enter 2.1.3; Otherwise, continue dispatched users, until the total transmitting data stream number of the user who selects equals supported maximum transmission data fluxion on unit resource piece.
2.1.3 upgrade the resource count device T0=T0+1 of Serving cell; I community judges whether to meet:
If satisfied represent that the preferential resource of this community is assigned; Otherwise, enter 2.1.2 and continue to carry out;
Whether other communities that 2.2 base stations are detected under controlling with base station complete the distribution of corresponding priority scheduling resource, if complete, enter 2.3; Otherwise other communities continue to carry out according to the process from 2.1.1～2.1.3.
2.3 determine assignment information and the transformat of Serving cell surplus resources.
2.3.1 Serving cell initialization resource count device T0.The resource count device T0 of cell i is initialized as
2.3.2 which user the priority scheduling community that Serving cell query resource piece T0 is corresponding has distributed to by Resource Block T0.If comprised in these users, need the user of this cell cooperative UE
c, from the register of priority scheduling community, read the PMI of this user feedback Gei Zhe community, and inquire about the corresponding code book in priority scheduling community, obtain this community transmitting antenna to UE
cbetween the right singular vector of channel
enter 2.3.3; Otherwise, enter 2.3.4;
2.3.3 the channel information for the treatment of collaboration user of Serving cell scheduler based on priority scheduling community, this community user fairness, and available channel state information is determined dispatched users and is sent pre-coding matrix.Concrete, the scheduling process based on cooperation is:
When first user of scheduling, first inquire about code book, obtain quantizing Hou Zhe community transmitting antenna to candidate user UE
1, m, m=1 ... M, the right singular vector of channel between (the candidate user number that M is cell i)
with
form equivalent channel matrix
according to zero-forcing beamforming principle, ask equivalent channel matrix H
effectpseudoinverse, get first row vector, normalization obtains candidate's precoding vector.Calculated candidate user's instantaneous transmission speed, according to ratio proportional fairness principle, selects the 1st user.If the user Wei Zhe community user to be saved who selects, end user is selected, and uses the pre-coding matrix of this scheduling generation as sending pre-coding matrix, enters 2.3.5;
When k+1 user of scheduling, first inquire about code book, obtain quantizing Hou Zhe community transmitting antenna and arrive the right singular vector of channel between dispatched users
to candidate user UE
k+1, mbetween the right singular vector of channel
with
form equivalent channel matrix
according to zero-forcing beamforming principle, ask equivalent channel matrix H
effectpseudoinverse, get front k+1 column vector, after normalization, obtain candidate's pre-coding matrix.Calculate the overall transmission rate of dispatched users and candidate user, if the overall transmission rate of dispatched users and any candidate user is all lower than the overall transmission rate of dispatched users, end user is selected, and uses pre-coding matrix that the k time scheduling obtain as transmission pre-coding matrix.Otherwise, select the candidate user of overall transmission rate maximum as k+1 dispatched users, if k+1 the user Wei Zhe community user to be saved who selects, end user is selected, and use the pre-coding matrix of this scheduling generation as sending pre-coding matrix, enter 2.3.5; Otherwise, continue dispatched users, until selecting total transmission data number for the treatment of collaboration user of user and priority scheduling community, this community equals supported maximum transmission data fluxion on unit resource piece;
2.3.4 scheduler, according to this community user equitable proportion and available channel state information, is determined dispatched users and is sent pre-coding matrix; (detailed process and 2.1.2 are similar)
2.3.5 upgrade resource count device T0=(T0+1) %N
rB, wherein % represents modulo operation; I community judges whether to meet:
If satisfied represent that this community completes resource and distributes; Otherwise, enter 2.3.2.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (7)
1. the method for multi-cell system allocation of downlink resource is controlled in a same base station, it is characterized in that, the different districts that same base station is controlled adopts sub-bands different under same frequency band as boss's frequency band, adopt remaining frequency band as auxiliary sub-band, carry out respectively the distribution of priority scheduling resource and the distribution of residue scheduling resource, the method comprises:
For priority scheduling resource, each community is precoding matrix indicators PMI and the channel quality indicator (CQI) according to reporting of user according to proportional fairness principle, adopt zero-forcing beamforming technology, in priority scheduling resource, the user that will dispatch is carried out to precoding, obtain dispatched users and be the priority scheduling resource of dispatched users distribution;
For residue scheduling resource, collaboration user is determined according to the CQI of reporting of user and cooperative information in each community, and adopting zero-forcing beamforming technology is that collaboration user and the user that will dispatch carry out precoding according to proportional fairness principle, distributes residue scheduling resource;
Described each community is PMI and the CQI according to reporting of user according to proportional fairness principle, adopt zero-forcing beamforming technology, in priority scheduling resource, the user that will dispatch is carried out to precoding, obtain dispatched users and for the process of the priority scheduling resource of dispatched users distribution be:
Each community is according to a user of proportional fairness principle scheduling, determine whether as user to be saved, if, according to the PMI of this reporting of user to be saved, the code book that inquiry arranges in priority scheduling resource carries out precoding, as this user's to be saved downlink resource, described in user to be saved for can not get the user of community service within the time period of setting; Otherwise, adopt zero-forcing beamforming technology that priority scheduling resource is distributed to remaining users;
The process that described employing zero-forcing beamforming technology is distributed to remaining users by priority scheduling resource is:
During k+1 remaining users of each cell scheduling, k is natural number, according to corresponding relation, the PMI that the PMI that k+1 remaining users reported and dispatched users report is converted to after corresponding precoding vector matrix, adopt zero-forcing beamforming principle to obtain each user's precoding vector, according to the CQI of k+1 remaining users and modulated degree reporting of user, calculate k+1 remaining users and the overall transmission rate of dispatched users, if any overall transmission rate is lower than the overall transmission rate of dispatched users, adopt this precoding vector as the resource of distributing in priority scheduling resource, otherwise, select the candidate user of overall transmission rate maximum as k+1 remaining users, determine whether as user to be saved, if so, adopt this corresponding precoding vector obtaining as the resource of distributing in priority scheduling resource, if not, continue scheduling remaining users, until select total transmitting data stream number, equal the maximum transmission data stream that this priority scheduling resource can be supported, precoding vector corresponding during using this remaining users of scheduling is as the resource of distributing in priority scheduling resource.
2. the method for claim 1, is characterized in that, described definite user's to be saved process is:
Within the time period of setting, according to determining each user in the CQI of reporting of user, in down channel, transmit the average throughput of data, the average throughput that transmits data according to each user in down channel sorts from small to large, using the user of front setting number as user to be saved.
3. the method for claim 1, is characterized in that, describedly according to the CQI of reporting of user and cooperative information, determines that the process of collaboration user is:
According to the cooperative information that needs of reporting of user, determine, when the difference of measuring the pilot signal received power RSRP of Serving cell and interfered cell as user is less than predefined threshold value, to Serving cell, reports and need cooperative information.
4. method as claimed in claim 3, is characterized in that, described employing zero-forcing beamforming technology is that collaboration user and the user that is not scheduled carry out precoding according to proportional fairness principle, distributes the process of residue scheduling resource to be:
Each community, according to proportional fairness principle, adopts close-to zero beam principle, according to the PMI of collaboration user transmission, PMI and the residue scheduling resource that remaining users sends, determines remaining users and the remaining users distribution surplus resources for dispatching that will dispatch.
5. method as claimed in claim 4, is characterized in that, the method further comprises:
When first remaining users of scheduling, the PMI that the PMI reporting according to first remaining users and collaboration user report, obtains corresponding precoding vector matrix, according to zero-forcing beamforming principle, try to achieve after the pseudoinverse of this matrix, get first row vector, normalization obtains candidate's precoding vector;
The instantaneous transmission speed of remaining users is calculated in each community, according to proportional fairness principle, select one of them as the 1st candidate user, if this candidate user is user to be saved, finish to select, use this candidate's precoding vector obtaining as the surplus resources distributing for remaining users;
When k+1 remaining users of scheduling, according to the PMI of k+1 reporting of user and the PMI that dispatched users has reported be converted to corresponding precoding vector matrix, according to zero-forcing beamforming principle, try to achieve after the pseudoinverse of this matrix, get k+1 column vector, normalization obtains candidate's precoding vector;
Each community is according to the CQI of k+1 user and modulated degree reporting of user, calculate k+1 remaining users and the overall transmission rate of dispatched users, if any overall transmission rate is all lower than the overall transmission rate of dispatched users, the candidate's precoding vector obtaining while adopting k user of scheduling is as the surplus resources distributing for remaining users; Otherwise, select the candidate user of overall transmission rate maximum as k+1 remaining users, determine whether as user to be saved, if so, adopt this candidate's precoding vector obtaining as the surplus resources distributing for remaining users; If not, continue scheduling remaining users, until select total transmitting data stream number, equal this priority scheduling resource and carve the maximum transmission data fluxion of supporting and equal until select total transmitting data stream number the maximum transmission data stream that this priority scheduling resource can be supported, during using this remaining users of scheduling, corresponding candidate's precoding vector is the surplus resources that remaining users is distributed as distributed resource.
6. the method for claim 1, is characterized in that, when not defining collaboration user, the method also comprises:
The PMI that each community reports according to remaining users according to proportional fairness principle and CQI, adopt zero-forcing beamforming technology, in residue scheduling resource, the user that will dispatch is carried out to precoding, obtains dispatched users and be the residue scheduling resource of dispatched users distribution.
7. the method for claim 1, is characterized in that, before remaining scheduling resource, the method also comprises:
Base station judges whether that the priority scheduling resource of each controlled community is assigned to dispatched users, if so, carries out the distribution of residue scheduling resource, otherwise, return to the allocation step of carrying out priority scheduling resource.
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| CN103236878B (en) * | 2013-04-19 | 2015-08-26 | 西安交通大学 | A kind of coordinates beam shaping method receiving vector estimation based on maximum-ratio combing |
| CN103687040B (en) * | 2013-11-29 | 2017-12-29 | 华为技术有限公司 | dispatching method, device and base station |
| CN104796988B (en) * | 2014-01-17 | 2018-10-12 | 中国移动通信集团公司 | A kind of resource allocation methods and device |
| CN105611640B (en) * | 2015-10-30 | 2019-01-15 | 哈尔滨工程大学 | A kind of adjustable CoMP downlink user dispatching method of equitable degree |
| CN107666711B (en) * | 2016-07-27 | 2020-10-02 | 成都鼎桥通信技术有限公司 | Downlink resource configuration method and device |
| CN107896123B (en) * | 2016-09-30 | 2021-03-02 | 电信科学技术研究院 | Large-scale antenna beam transmission method, base station and terminal |
| WO2019028924A1 (en) * | 2017-08-11 | 2019-02-14 | 华为技术有限公司 | Communication method and related device |
| CN108934030B (en) * | 2018-07-19 | 2021-08-03 | 中信科移动通信技术股份有限公司 | Method for avoiding cross interference of IAB base station |
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| CN1889402A (en) * | 2005-06-28 | 2007-01-03 | 华为技术有限公司 | Multiplexing realizing method for radio communication system time frequency resource |
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