CN102281643A - Method for same base station to make multi-cell system distribute downlink resources - Google Patents
Method for same base station to make multi-cell system distribute downlink resources Download PDFInfo
- Publication number
- CN102281643A CN102281643A CN2010102064283A CN201010206428A CN102281643A CN 102281643 A CN102281643 A CN 102281643A CN 2010102064283 A CN2010102064283 A CN 2010102064283A CN 201010206428 A CN201010206428 A CN 201010206428A CN 102281643 A CN102281643 A CN 102281643A
- Authority
- CN
- China
- Prior art keywords
- user
- scheduling resource
- resource
- sub
- remaining users
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000005516 engineering process Methods 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims description 57
- 239000011159 matrix material Substances 0.000 claims description 42
- 238000013468 resource allocation Methods 0.000 claims description 10
- 238000010606 normalization Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
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 a kind of method of same base stations control multi-cell system allocation of downlink resource.
Background technology
In next generation mobile communication system, adopted orthogonal frequency (OFDM) as the downlink multi-access access technology, improve the availability of frequency spectrum.In this mobile communication system, the scheduling downlink resource of a plurality of sub-districts can be controlled in same base station, and these a plurality of sub-districts are neighbor cell each other.Each cell configuration has many dual-mode antennas, and the user in each sub-district also disposes many dual-mode antennas, when each sub-district is user's allocation of downlink resource, adopts precoding technique.
In same base stations control multi-cell system, each sub-district that same base station is controlled all 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 auxilliary sub-band, carries out the distribution of downlink resource.
Interference (both may be same sub-band, produce co-channel interference) when assisting the scheduling downlink resource of sub-band, can be caused to boss's frequency band or the auxilliary sub-band that its neighbor cell distributed respectively in a plurality of sub-districts of controlling with the base station.As shown in Figure 1, Fig. 1 is same base stations control multi-cell system schematic diagram: three sub-districts are arranged among the figure, and the user UE that administers to some extent in each sub-district, user UE can be subjected to neighbor cell interference.Particularly, as shown in Figure 2, the interference schematic diagram of neighbor cell when Fig. 2 is same base stations control multi-cell system, the frequency band of wherein giving three sub-districts is divided into three sub-frequency bands, when single cell scheduling, sub-district 0,1 and 2 is adopted the boss frequency band of different sub-bands as self respectively, when cooperation cell is dispatched, just will not dispatch as the auxilliary sub-band of sub-district 0,1 and 2 as the sub-band of boss's frequency band, this can produce its neighbor cell and disturb.
In order to solve the presence of intercell interference that same base station is controlled, coordinate multipoint (CoMP) technology has been proposed.The coordinate multipoint technology can be eliminated the presence of intercell interference that same base station is controlled from the spatial domain, improve the Cell Edge User transmission performance of controlling same base station.Specifically, the 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, the sub-district that is current administration user adopts the downlink resource that is distributed to send downlink data for the user, information is transmitted by shared channel in a plurality of sub-districts by same base stations control, carry out cooperative scheduling and precoding processing, with reduce this user when being positioned at the Serving cell edge other neighbor cells to its interference problem.
For each sub-district that same base station is controlled, when carrying out cooperative scheduling/cooperative beam figuration, need optimize user's downlink data receiving intensity of administering this sub-district simultaneously, reduce the user that neighbor cell is administered and disturb.In order to reach this purpose, each sub-district that same base station is controlled is when being user's allocation of downlink resource of being administered, employing is leaked based on letter and is made an uproar than the cooperation precoding technique of (SLNR) criterion, and the SLNR criterion is the user received signal intensity of Serving cell and neighbor cell causes interference value to this user ratio.When adopting the SLNR criterion, need be subjected to the reporting of user down channel correlation matrix of neighbor cell interference, could make Serving cell carry out precoding, the allocation of downlink resource according to the SLNR criterion.
Adopting said method is user's allocation of downlink resource in each sub-district of controlling, same base station, exist shortcoming: 1) this method user that need be subjected to neighbor cell interference reports detailed down channel to detect information to Serving cell, be the down channel correlation matrix, additionally take a large amount of ascending resources; 2) in the cooperation precoding process based on the 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 method of same base stations control multi-cell system allocation of downlink resource, this method reaches under the situation that reduces amount of calculation in precoding process in the data volume that reduces reporting of user down channel detection information, be user's allocation of downlink resource, and eliminate the interference of neighbor cell the user.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of method of same base stations control multi-cell system allocation of downlink resource, the different districts that same base station is controlled adopts sub-bands different under the same frequency band as boss's frequency band, adopt remaining frequency band as auxilliary sub-band, carry out the distribution of priority scheduling resource and the distribution of residue scheduling resource respectively, this method comprises:
For the priority scheduling resource, each sub-district is according to the precoding matrix indicators PMI and the channel quality indicator (CQI) of equitable proportion principle basis reporting of user, adopt the zero-forcing beamforming technology in the priority scheduling resource, the user that will dispatch to be carried out precoding, obtain dispatched users and reach the priority scheduling resource of distributing for dispatched users;
For the residue scheduling resource, collaboration user is determined according to the CQI and the cooperative information of reporting of user in each sub-district, and adopting the zero-forcing beamforming technology is that the collaboration user and the user that will dispatch carry out precoding according to the equitable proportion principle, distributes the residue scheduling resource.
Described each sub-district is according to the PMI and the CQI of equitable proportion principle basis reporting of user, adopt the zero-forcing beamforming technology in the priority scheduling resource, the user that will dispatch to be carried out precoding, obtain dispatched users and for the process of the priority scheduling resource of dispatched users distribution be:
Each sub-district is according to user of equitable proportion principle scheduling, determine whether to be user to be saved, if, then wait to save the PMI of reporting of user according to this, the code book that inquiry is provided with in the priority scheduling resource carries out precoding, wait to save user's downlink resource as this, describedly wait to save the user in the time period of setting, can not get the user of sub-district service; Otherwise, adopt the zero-forcing beamforming technology to give remaining users with the priority scheduling resource allocation.
Describedly determine to wait that the process of saving the user is:
In the time period of setting, in down channel, transmit the average throughput of data according to determining each user among the CQI of reporting of user, the average throughput that transmits data according to each user in down channel sorts from small to large, with the user of preceding setting number as user to be saved.
Described employing zero-forcing beamforming technology is to the process of remaining users the priority scheduling resource allocation:
During k+1 remaining users of each cell scheduling, k is a natural number, according to corresponding relation, the PMI that k+1 remaining users reported and after the PMI that reports of dispatched users has been converted to corresponding precoding vector matrix, adopt the zero-forcing beamforming principle to obtain each user's precoding vector, CQI according to k+1 remaining users and modulated degree reporting of user, calculate k+1 remaining users and modulated degree user's overall transmission rate, if any overall transmission rate is lower than modulated degree user's overall transmission rate, then adopt this precoding vector as the resource of in the priority scheduling resource, being distributed; Otherwise the candidate user of selecting the overall transmission rate maximum determines whether to be user to be saved as k+1 remaining users, if the precoding vector that then adopts this correspondence that obtains is as the resource of being distributed in the priority scheduling resource; If not, then continue the scheduling remaining users, equal the maximum transmission data stream that this priority scheduling resource can be supported up to selecting total transmitting data stream number, the precoding vector of correspondence is as the resource of being distributed in the priority scheduling resource during with this remaining users of scheduling.
The described process of determining collaboration user according to the CQI and the cooperative information of reporting of user is:
Determine that according to the needs cooperative information of reporting of user the difference of pilot signal received power RSRP of measuring Serving cell and interfered cell as the user is during less than pre-set threshold, reporting to Serving cell needs cooperative information.
Described employing zero-forcing beamforming technology is that collaboration user and the user that is not scheduled carry out precoding according to the equitable proportion principle, distributes the process of residue scheduling resource to be:
Each sub-district is according to the equitable proportion principle, and employing close-to zero beam principle determines that according to the PMI of collaboration user transmission, PMI and the residue scheduling resource that remaining users sends it is that the remaining users that will dispatch is distributed surplus resources that the remaining users that will dispatch reaches.
This method further comprises:
In scheduling during first remaining users, the PMI that PMI that reports according to first remaining users and collaboration user report obtains corresponding precoding vector matrix, according to the zero-forcing beamforming principle, after trying to achieve the pseudoinverse of this matrix, get first column vector, normalization obtains candidate's precoding vector;
The instantaneous transmission speed of remaining users is calculated in each sub-district, according to the equitable proportion principle, select one of them as the 1st candidate user, if this candidate user is user to be saved, then finish to select, use this candidate's precoding vector that obtains as the surplus resources that distributes as remaining users;
When k+1 remaining users of scheduling, according to the PMI of k+1 reporting of user and the PMI that reports of dispatched users be converted to corresponding precoding vector matrix, according to the zero-forcing beamforming principle, try to achieve the pseudoinverse of this matrix after, get the k+1 column vector, normalization obtains candidate's precoding vector;
Each sub-district is according to the CQI of k+1 user and modulated degree reporting of user, calculate k+1 remaining users and modulated degree user's overall transmission rate, if any overall transmission rate all is lower than modulated degree user's overall transmission rate, the candidate's precoding vector that obtains when then adopting k user of scheduling is as the surplus resources that distributes for remaining users; Otherwise the candidate user of selecting the overall transmission rate maximum determines whether to be user to be saved as k+1 remaining users, if adopt this candidate's precoding vector that obtains as the surplus resources that distributes for remaining users; If not, continue the scheduling remaining users, equal this priority scheduling resource and carve the maximum transmission data fluxion of supporting and equal the maximum transmission data stream that this priority scheduling resource can be supported up to selecting total transmitting data stream number up to selecting total transmitting data stream number, candidate's precoding vector of correspondence is the surplus resources that remaining users is distributed as the resource of being distributed during with this remaining users of scheduling.
When not defining collaboration user, this method also comprises:
PMI and CQI that each sub-district reports according to equitable proportion principle basis remaining users adopt the zero-forcing beamforming technology in the residue scheduling resource user that will dispatch to be carried out precoding, obtain dispatched users and reach the residue scheduling resource that distributes for dispatched users.
Before remaining scheduling resource, this method also comprises:
The base station judges whether that the priority scheduling resource of each sub-district of being controlled all is assigned to dispatched users, if, then carry out the distribution of residue scheduling resource, otherwise, the allocation step of carrying out the priority scheduling resource returned.
From such scheme as can be seen, it is that user in the Serving cell distributes that the present invention is divided into priority scheduling resource and residue scheduling resource with the downlink resource of Serving cell: for the priority scheduling resource, it is boss's frequency band of Serving cell, adopt the zero-forcing beamforming technology, precoding matrix indicators (PMI) and channel quality indication (CQI) according to equitable proportion principle basis reporting of user, in the priority scheduling resource, the user that will dispatch is carried out precoding, obtain dispatched users and reach the priority scheduling resource of distributing for dispatched users; For the residue scheduling resource, it is the auxilliary sub-band of Serving cell, can be subjected to the interference of neighbor cell, CQI and cooperative information according to reporting of user are determined collaboration user, adopt the zero-forcing beamforming technology, according to the equitable proportion principle is that collaboration user and the user that is not scheduled carry out precoding, distributes the residue scheduling resource, prevents to be subjected to the interference of neighbor cell.In this scheme, the user of Serving cell only reports descending channel informations such as PMI and CQI, and the user who is subjected to neighbor cell interference need not to report the down channel correlation matrix to Serving cell, so reduced the data volume of reporting of user down channel detection information; Serving cell obtains corresponding precoding vector matrix computations according to code book when distributing priority scheduling resource and residue scheduling resource for the user, amount of calculation is fewer.
Description of drawings
Fig. 1 is same base stations control multi-cell system schematic diagram;
The interference schematic diagram of neighbor cell when Fig. 2 is same base stations control multi-cell system;
Fig. 3 is the method flow diagram of same base stations control multi-cell system allocation of downlink resource provided by the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
From prior art as can be seen, carry out downlink resource for each sub-district of same base stations control and divide timing, realize coordinate multipoint, so the cooperation precoding technique of SLNR criterion has been adopted in this each sub-district, and adopt this Technology Need to be subjected to the reporting of user down channel correlation matrix of neighbor cell interference, and the amount of calculation of precoding process is bigger.In order to overcome the problems referred to above, it is that user in the Serving cell distributes that the present invention has adopted the downlink resource with Serving cell to be divided into priority scheduling resource and residue scheduling resource: for the priority scheduling resource, it is boss's frequency band of Serving cell, PMI and CQI according to equitable proportion principle basis reporting of user, in the priority scheduling resource, carry out precoding, obtain dispatched users and reach the priority scheduling resource of distributing for dispatched users; For the residue scheduling resource, it is the auxilliary sub-band of Serving cell, can be subjected to the interference of neighbor cell, then determine collaboration user according to the CQI and the cooperative information of reporting of user, adopt the zero-forcing beamforming technology, according to the equitable proportion principle is that collaboration user and the user that is not scheduled carry out precoding, distributes the residue scheduling resource, prevents to be subjected to the interference of neighbor cell.
In the present invention, each sub-district that same base station is controlled all 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 auxilliary sub-band, carries out the scheduling of downlink resource.Therefore, for each sub-district, all be 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 auxilliary sub-band downlink resource, is called the distribution of surplus resources.
In the present invention, a plurality of technical name have been related to, for better understanding, at first to the explanation that makes an explanation of these technical name.
Serving cell, the i.e. sub-district at the current place of user;
Neighbor cell is promptly with neighboring cell;
Modulated degree user has promptly distributed the user of downlink resource;
Candidate user is promptly just the user of allocation of downlink resource;
Remaining users, the i.e. user of unallocated downlink resource also;
User to be saved, promptly in the sub-district in the setting-up time section the relatively poor user of channel quality;
Collaboration user promptly is subjected to neighbor cell interference and for waiting to save user's user.
Fig. 3 is the method flow diagram of same base stations control multi-cell system allocation of downlink resource provided by the invention, with one of them Serving cell allocation of downlink resource is that example is elaborated, be divided into the preferential resource allocation process in the Serving cell and the surplus resources assigning process of Serving cell, its concrete steps are:
The preferential resource allocation process of Serving cell:
In this step, CQI is that user that the sub-district is administered obtains after measuring downstream signal and sends to the sub-district;
In this step, PMI is the designator of this sub-district to the right unusual pseudo-inverse vector correspondence of user's down channel correlation matrix, this corresponding relation obtains according to predefined code book, this code book all is provided with user and sub-district, PMI is that the user obtains by the downlink channel condition information pilot tone (CSI-RS) of measuring the sub-district, obtaining and calculating of PMI is prior art all, repeats no more here;
Step 302, Serving cell determine according to user of equitable proportion principle scheduling whether this user is user to be saved, if, execution in step 303; Otherwise, execution in step 304;
In this step, waiting to save the user is exactly in a period of time, can not get the user of Serving cell service because down channel quality is relatively poor, and Serving cell determines to wait that the method for saving the user is:
In the time period of setting, in down channel, transmit the average throughput of data according to determining each user among the CQI of reporting of user, the average throughput that transmits data according to user that Serving cell is administered in down channel sorts from small to large, with the user of preceding setting number as user to be saved;
In this step, user to be saved is mainly Serving cell edge customer or Serving cell center but is subjected to the user of strong shadow influence of fading, these users' down channel quality itself is relatively poor, if transmit at the enterprising line data of down channel simultaneously with other users that Serving cell is administered, then with further degrade performance;
In this step, concrete distribution method is: during k+1 remaining users of cell scheduling, according to corresponding relation, the PMI that k+1 remaining users reported and after the PMI that reports of dispatched users has been converted to corresponding precoding vector matrix, adopt the zero-forcing beamforming principle to obtain each user's precoding vector, CQI according to k+1 remaining users and modulated degree reporting of user, calculate k+1 remaining users and modulated degree user's overall transmission rate, if any overall transmission rate is lower than modulated degree user's overall transmission rate, then adopt this precoding vector as the resource of in the priority scheduling resource, being distributed; Otherwise the candidate user of selecting the overall transmission rate maximum determines whether to be user to be saved as k+1 remaining users, if the precoding vector that then adopts this correspondence that obtains is as the resource of being distributed in the priority scheduling resource; If not, then continue the scheduling remaining users, equal the maximum transmission data stream that this priority scheduling resource can be supported up to selecting total transmitting data stream number, the precoding vector of correspondence is as the resource of being distributed in the priority scheduling resource during with this remaining users of scheduling;
Step 306, Serving cell determine whether the priority scheduling resource has distributed to the collaboration user of sub-district, if then execution in step 307; If not, execution in step 308 then;
In this step, the collaboration user process of determining Serving cell is: the needs cooperative information according to reporting of user is determined, the difference of pilot signal received power (RSRP) of measuring Serving cell and interfered cell as the user is during less than pre-set threshold, and will report to Serving cell needs cooperative information;
The detailed process of this step is: when first remaining users of scheduling, the PMI that PMI that reports according to first remaining users and collaboration user report, obtain corresponding precoding vector matrix, according to the zero-forcing beamforming principle, after trying to achieve the pseudoinverse of this matrix, get first column vector, normalization obtains candidate's precoding vector.Serving cell calculates the instantaneous transmission speed of remaining users, according to the equitable proportion principle, select one of them as the 1st candidate user, if this candidate user is user to be saved, then finish to select, use this candidate's precoding vector that obtains as the surplus resources that distributes as remaining users;
When k+1 remaining users of scheduling, according to the PMI of k+1 reporting of user and the PMI that reports of dispatched users be converted to corresponding precoding vector matrix, according to the zero-forcing beamforming principle, try to achieve the pseudoinverse of this matrix after, get the 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 modulated degree user's overall transmission rate, if any overall transmission rate all is lower than modulated degree user's overall transmission rate, the candidate's precoding vector that obtains when then adopting k user of scheduling is as the surplus resources that distributes for remaining users; Otherwise the candidate user of selecting the overall transmission rate maximum determines whether to be user to be saved as k+1 remaining users, if adopt this candidate's precoding vector that obtains as the surplus resources that distributes for remaining users; If not, continue the scheduling remaining users, equal this priority scheduling resource and carve the maximum transmission data fluxion of supporting and equal the maximum transmission data stream that this priority scheduling resource can be supported up to selecting total transmitting data stream number up to selecting total transmitting data stream number, candidate's precoding vector of correspondence is the surplus resources that remaining users is distributed as the resource of being distributed during with this remaining users of scheduling;
In this step, detailed process is identical with the assigning process that carries out the priority scheduling resource, only distributes in surplus resources, repeats no more here;
Step 309, sub-district determine whether that all resources all have been assigned with, if, process ends then, otherwise, return step 306 and continue to carry out.
In the present invention, each sub-district that same base station is administered all 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 sub-district, the base station can judge whether that the descending priority scheduling resource of all sub-districts all distributes, and the user in each sub-district has been given in indication, if then carry out the distribution of the descending surplus resources of each sub-district of being administered again.
The present invention will be described for object lesson of tool.
At first, suppose that a base station controls a plurality of sub-districts simultaneously, then the downlink resource that this base station can be distributed is divided into the N group, has priority scheduling resource group in every group of resource, and the 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 sub-districts of same base stations control, the assignment information and the transformat of priority scheduling resource group at first determined in each sub-district, and then, remain the distribution of downlink resource based on the resource allocation conditions of this priority scheduling resource group.
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;
Round under the expression;
Secondly, in dispatching cycle, the downlink resource of each sub-district is assigned as:
1) determines the assignment information and the transformat of this sub-district priority scheduling resource.
1.1 this sub-district is provided with resource count device T0.The resource count device T0 of cell i is initialized as
1.2 this sub-district according to user's the equitable proportion principle and the downlink channel condition information of reception, is determined dispatched users and is distributed to the downlink resource transport format information of this dispatched users, just pre-coding matrix.
Here, downlink channel condition information comprises CQI and the PMI that the user fed back in this sub-district, and PMI has represented the right singular vector of cell i to portable terminal j channel matrix, is calculated as follows:
Wherein, H
Ij(f) be the channel of cell i to user j; Rsv (A) is the right singular vector of matrix; S is the subcarrier set of this channel.Obtain v
IjAfter, the user selects the vector of quantization error minimum from the code book that is provided with
With 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 support user transmission among the rel 10.
When cell i is user's allocation of downlink resource, dispatch an arbitrary user UE according to equity criterion
1If, user UE
1Be the user to be saved of this cell i, then cell i is inquired about code book, with user UE
1The precoding vector of the PMI correspondence of feedback changes step 1.2 then over to and continues to carry out as this user's transmission precoding vector, otherwise, then dispatch remaining users;
The process of scheduling remaining users is: when k+1 user of scheduling, and the code book that inquiry earlier is provided with, the transmitting antenna after obtaining respectively quantizing is to the right singular vector of channel between the modulated degree user
And to candidate user UE
K+1, mM=1 ... the right singular vector of channel between the M (M is the candidate user number of cell i)
Form equivalent channel matrix
Obtain the precoding vector of remaining users according to the zero-forcing beamforming method.
Calculate the overall transmission rate of modulated degree user and candidate user, if this overall transmission rate is lower than modulated degree user's overall transmission rate, then end user scheduling, and use precoding vector that the k time scheduling obtain as the transmission pre-coding matrix, enter 2.1.3; Otherwise, the candidate user of selecting the overall transmission rate maximum is as k+1 dispatched users, if k+1 the user who selects is this sub-district user to be saved, then finishes the portable terminal scheduling, the precoding vector that uses this scheduling generation enters 2.1.3 as sending precoding vector; Otherwise, continue dispatched users, equal supported maximum transmission data fluxion on the unit resource piece up to the total transmitting data stream number of the user who selects.
2.1.3 the resource count device T0=T0+1 of update service sub-district; I sub-district judges whether to satisfy:
If satisfy and represent that then the preferential resource allocation of this sub-district finishes; Otherwise, enter 2.1.2 and continue to carry out;
2.2 the distribution of whether finishing corresponding priority scheduling resource with other sub-districts under the base stations control is detected in the base station, then enters 2.3 if finish; Otherwise other sub-districts continue to carry out according to the process from 2.1.1～2.1.3.
2.3 determine the 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 sub-district of Serving cell query resource piece T0 correspondence has distributed to Resource Block T0.If comprised among these users and needed the user of this cell cooperative UE
C, then from the register of priority scheduling sub-district, read the PMI that this sub-district is given in this user feedback, and the corresponding code book in the inquiry priority scheduling sub-district, this sub-district transmitting antenna obtained to UE
CBetween the right singular vector of channel
Enter 2.3.3; Otherwise, enter 2.3.4;
2.3.3 the Serving cell scheduler is based on the channel information for the treatment of collaboration user of priority scheduling sub-district, this community user fairness, and the available channel state information is determined dispatched users and is sent pre-coding matrix.Concrete, based on the scheduling process of cooperating be:
When first user of scheduling, inquire about code book earlier, this sub-district transmitting antenna after obtaining quantizing is to candidate user UE
1, m, m=1 ... M, the right singular vector of channel between (M is the candidate user number of cell i)
With
Form equivalent channel matrix
According to the zero-forcing beamforming principle, ask equivalent channel matrix H
EffectPseudoinverse, get first column vector, normalization obtains candidate's precoding vector.Calculated candidate user's instantaneous transmission speed according to the ratio ratio fairness doctrine, is selected the 1st user.If the user who selects is this sub-district user to be saved, then end user is selected, and the pre-coding matrix that uses this scheduling generation enters 2.3.5 as sending pre-coding matrix;
When k+1 user of scheduling, inquire about code book earlier, this sub-district transmitting antenna after obtaining quantizing is to the right singular vector of channel between the modulated degree user
To candidate user UE
K+1, mBetween the right singular vector of channel
With
Form equivalent channel matrix
According to the zero-forcing beamforming principle, ask equivalent channel matrix H
EffectPseudoinverse, get before the k+1 column vector, obtain candidate's pre-coding matrix after the normalization.Calculate the overall transmission rate of modulated degree user and candidate user, if the overall transmission rate of modulated degree user and any candidate user all is lower than modulated degree user's overall transmission rate, then end user is selected, and uses pre-coding matrix that the k time scheduling obtain as the transmission pre-coding matrix.Otherwise, the candidate user of selecting the overall transmission rate maximum is as k+1 dispatched users, if k+1 the user who selects is this sub-district user to be saved, then end user is selected, and the pre-coding matrix that uses this scheduling generation enters 2.3.5 as sending pre-coding matrix; Otherwise, continuing dispatched users, total transmission data number for the treatment of collaboration user of selecting user and priority scheduling sub-district up to this sub-district equals supported maximum transmission data fluxion on the unit resource piece;
2.3.4 scheduler, is determined dispatched users according to this community user equitable proportion and available channel state information 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 sub-district judges whether to satisfy:
If resource allocation is finished in satisfied this sub-district of then representing; Otherwise, enter 2.3.2.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. the method for a same base stations control multi-cell system allocation of downlink resource, it is characterized in that, the different districts that same base station is controlled adopts sub-bands different under the same frequency band as boss's frequency band, adopt remaining frequency band as auxilliary sub-band, carry out the distribution of priority scheduling resource and the distribution of residue scheduling resource respectively, this method comprises:
For the priority scheduling resource, each sub-district is according to the precoding matrix indicators PMI and the channel quality indicator (CQI) of equitable proportion principle basis reporting of user, adopt the zero-forcing beamforming technology in the priority scheduling resource, the user that will dispatch to be carried out precoding, obtain dispatched users and reach the priority scheduling resource of distributing for dispatched users;
For the residue scheduling resource, collaboration user is determined according to the CQI and the cooperative information of reporting of user in each sub-district, and adopting the zero-forcing beamforming technology is that the collaboration user and the user that will dispatch carry out precoding according to the equitable proportion principle, distributes the residue scheduling resource.
2. the method for claim 1, it is characterized in that, described each sub-district is according to the PMI and the CQI of equitable proportion principle basis reporting of user, adopt the zero-forcing beamforming technology in the priority scheduling resource, the user that will dispatch to be carried out precoding, obtain dispatched users and for the process of the priority scheduling resource of dispatched users distribution be:
Each sub-district is according to user of equitable proportion principle scheduling, determine whether to be user to be saved, if, then wait to save the PMI of reporting of user according to this, the code book that inquiry is provided with in the priority scheduling resource carries out precoding, wait to save user's downlink resource as this, describedly wait to save the user in the time period of setting, can not get the user of sub-district service; Otherwise, adopt the zero-forcing beamforming technology to give remaining users with the priority scheduling resource allocation.
3. method as claimed in claim 2 is characterized in that, describedly determines to wait that the process of saving the user is:
In the time period of setting, in down channel, transmit the average throughput of data according to determining each user among the CQI of reporting of user, the average throughput that transmits data according to each user in down channel sorts from small to large, with the user of preceding setting number as user to be saved.
4. method as claimed in claim 2 is characterized in that, described employing zero-forcing beamforming technology is to the process of remaining users the priority scheduling resource allocation:
During k+1 remaining users of each cell scheduling, k is a natural number, according to corresponding relation, the PMI that k+1 remaining users reported and after the PMI that reports of dispatched users has been converted to corresponding precoding vector matrix, adopt the zero-forcing beamforming principle to obtain each user's precoding vector, CQI according to k+1 remaining users and modulated degree reporting of user, calculate k+1 remaining users and modulated degree user's overall transmission rate, if any overall transmission rate is lower than modulated degree user's overall transmission rate, then adopt this precoding vector as the resource of in the priority scheduling resource, being distributed; Otherwise the candidate user of selecting the overall transmission rate maximum determines whether to be user to be saved as k+1 remaining users, if the precoding vector that then adopts this correspondence that obtains is as the resource of being distributed in the priority scheduling resource; If not, then continue the scheduling remaining users, equal the maximum transmission data stream that this priority scheduling resource can be supported up to selecting total transmitting data stream number, the precoding vector of correspondence is as the resource of being distributed in the priority scheduling resource during with this remaining users of scheduling.
5. the method for claim 1 is characterized in that, the described process of determining collaboration user according to the CQI and the cooperative information of reporting of user is:
Determine that according to the needs cooperative information of reporting of user the difference of pilot signal received power RSRP of measuring Serving cell and interfered cell as the user is during less than pre-set threshold, reporting to Serving cell needs cooperative information.
6. method as claimed in claim 5 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 the equitable proportion principle, distributes the process of residue scheduling resource to be:
Each sub-district is according to the equitable proportion principle, and employing close-to zero beam principle determines that according to the PMI of collaboration user transmission, PMI and the residue scheduling resource that remaining users sends it is that the remaining users that will dispatch is distributed surplus resources that the remaining users that will dispatch reaches.
7. method as claimed in claim 6 is characterized in that, this method further comprises:
In scheduling during first remaining users, the PMI that PMI that reports according to first remaining users and collaboration user report obtains corresponding precoding vector matrix, according to the zero-forcing beamforming principle, after trying to achieve the pseudoinverse of this matrix, get first column vector, normalization obtains candidate's precoding vector;
The instantaneous transmission speed of remaining users is calculated in each sub-district, according to the equitable proportion principle, select one of them as the 1st candidate user, if this candidate user is user to be saved, then finish to select, use this candidate's precoding vector that obtains as the surplus resources that distributes as remaining users;
When k+1 remaining users of scheduling, according to the PMI of k+1 reporting of user and the PMI that reports of dispatched users be converted to corresponding precoding vector matrix, according to the zero-forcing beamforming principle, try to achieve the pseudoinverse of this matrix after, get the k+1 column vector, normalization obtains candidate's precoding vector;
Each sub-district is according to the CQI of k+1 user and modulated degree reporting of user, calculate k+1 remaining users and modulated degree user's overall transmission rate, if any overall transmission rate all is lower than modulated degree user's overall transmission rate, the candidate's precoding vector that obtains when then adopting k user of scheduling is as the surplus resources that distributes for remaining users; Otherwise the candidate user of selecting the overall transmission rate maximum determines whether to be user to be saved as k+1 remaining users, if adopt this candidate's precoding vector that obtains as the surplus resources that distributes for remaining users; If not, continue the scheduling remaining users, equal this priority scheduling resource and carve the maximum transmission data fluxion of supporting and equal the maximum transmission data stream that this priority scheduling resource can be supported up to selecting total transmitting data stream number up to selecting total transmitting data stream number, candidate's precoding vector of correspondence is the surplus resources that remaining users is distributed as the resource of being distributed during with this remaining users of scheduling.
8. the method for claim 1 is characterized in that, when not defining collaboration user, this method also comprises:
PMI and CQI that each sub-district reports according to equitable proportion principle basis remaining users adopt the zero-forcing beamforming technology in the residue scheduling resource user that will dispatch to be carried out precoding, obtain dispatched users and reach the residue scheduling resource that distributes for dispatched users.
9. the method for claim 1 is characterized in that, before remaining scheduling resource, this method also comprises:
The base station judges whether that the priority scheduling resource of each sub-district of being controlled all is assigned to dispatched users, if, then carry out the distribution of residue scheduling resource, otherwise, the allocation step of carrying out the priority scheduling resource returned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010206428.3A CN102281643B (en) | 2010-06-12 | 2010-06-12 | Method for same base station to make multi-cell system distribute downlink resources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010206428.3A CN102281643B (en) | 2010-06-12 | 2010-06-12 | Method for same base station to make multi-cell system distribute downlink resources |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102281643A true CN102281643A (en) | 2011-12-14 |
| CN102281643B CN102281643B (en) | 2014-02-12 |
Family
ID=45106740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010206428.3A Expired - Fee Related CN102281643B (en) | 2010-06-12 | 2010-06-12 | Method for same base station to make multi-cell system distribute downlink resources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102281643B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236878A (en) * | 2013-04-19 | 2013-08-07 | 西安交通大学 | Maximum ratio combining receiving vector estimation-based coordinated beamforming method |
| CN103687040A (en) * | 2013-11-29 | 2014-03-26 | 华为技术有限公司 | Scheduling method, device and base station |
| WO2014106336A1 (en) * | 2013-01-06 | 2014-07-10 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for adaptive resource allocation |
| CN104796988A (en) * | 2014-01-17 | 2015-07-22 | ***通信集团公司 | Resource allocation method and device |
| CN105611640A (en) * | 2015-10-30 | 2016-05-25 | 哈尔滨工程大学 | Fairness adjustable CoMP downlink user scheduling method |
| CN107666711A (en) * | 2016-07-27 | 2018-02-06 | 成都鼎桥通信技术有限公司 | A kind of downlink resource collocation method and device |
| WO2018059005A1 (en) * | 2016-09-30 | 2018-04-05 | 电信科学技术研究院 | Large-scale antenna beam transmission method, base station and terminal |
| CN108934030A (en) * | 2018-07-19 | 2018-12-04 | 武汉虹信通信技术有限责任公司 | A method of avoiding the base station IAB cross jamming |
| WO2019028924A1 (en) * | 2017-08-11 | 2019-02-14 | 华为技术有限公司 | Communication method and related device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768497A (en) * | 2003-04-04 | 2006-05-03 | 松下电器产业株式会社 | Base station device and communication method |
| 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 |
-
2010
- 2010-06-12 CN CN201010206428.3A patent/CN102281643B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768497A (en) * | 2003-04-04 | 2006-05-03 | 松下电器产业株式会社 | Base station device and communication method |
| 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 |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014106336A1 (en) * | 2013-01-06 | 2014-07-10 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for adaptive resource allocation |
| 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 |
| CN103236878A (en) * | 2013-04-19 | 2013-08-07 | 西安交通大学 | Maximum ratio combining receiving vector estimation-based coordinated beamforming method |
| CN103687040A (en) * | 2013-11-29 | 2014-03-26 | 华为技术有限公司 | Scheduling method, device and base station |
| CN103687040B (en) * | 2013-11-29 | 2017-12-29 | 华为技术有限公司 | dispatching method, device and base station |
| CN104796988A (en) * | 2014-01-17 | 2015-07-22 | ***通信集团公司 | Resource allocation method and device |
| CN104796988B (en) * | 2014-01-17 | 2018-10-12 | ***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 |
| CN105611640A (en) * | 2015-10-30 | 2016-05-25 | 哈尔滨工程大学 | Fairness adjustable CoMP downlink user scheduling method |
| CN107666711A (en) * | 2016-07-27 | 2018-02-06 | 成都鼎桥通信技术有限公司 | A kind of downlink resource collocation method and device |
| WO2018059005A1 (en) * | 2016-09-30 | 2018-04-05 | 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 |
| CN110999455A (en) * | 2017-08-11 | 2020-04-10 | 华为技术有限公司 | Communication method and related equipment |
| CN110999455B (en) * | 2017-08-11 | 2022-04-29 | 华为技术有限公司 | Communication method and related equipment |
| CN108934030A (en) * | 2018-07-19 | 2018-12-04 | 武汉虹信通信技术有限责任公司 | A method of avoiding the base station IAB cross jamming |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102281643B (en) | 2014-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102281643B (en) | Method for same base station to make multi-cell system distribute downlink resources | |
| CN101373998B (en) | Low information interactive multi-base station collaboration MIMO as well as scheduling method and apparatus thereof | |
| CN101877887B (en) | Downlink transmission control method and device of cooperative multicast system | |
| CN101888665B (en) | Local scheduler-based multi-point cooperative transmission method | |
| CN102595385B (en) | Downlink transmission method and device | |
| CN101466151B (en) | Scheduling method for multi-user mimo | |
| US9876539B2 (en) | Method and apparatus for scalable load balancing across wireless heterogeneous MIMO networks | |
| CN102013905B (en) | The method and apparatus of cooperative scheduling | |
| CN101997583A (en) | Method and device for pairing uplink multi-user multi-input multi-output (MIMO) users supporting cooperation multi-point transmission | |
| CN102684835A (en) | Method and equipment for reporting multi-point channel state information | |
| CN101651880A (en) | Multi-cell coordination sending method | |
| CN106992805A (en) | Multi-antenna transmission method, base station and user terminal | |
| US10123326B2 (en) | Method and apparatus for resource allocation and for scheduling cellular and coordinated multipoint transmissions in heterogeneous wireless networks | |
| CN101951307A (en) | Method for selecting cell cooperation set under CoMP | |
| KR101935782B1 (en) | Method and apparatus for transmitting and receiving signals in multiple cellular network | |
| CN102186212A (en) | Intercell cooperation scheduling method, system and user equipment | |
| CN103391181A (en) | Method for transmitting data to terminal from base station, base station device and central control server | |
| CN104836647B (en) | Channel state information measurement and device | |
| CN106357314A (en) | Downlink precoding method and base station | |
| CN106330272A (en) | Precoding matrix indicator (PMI) sending and receiving method, and devices | |
| CN101472298B (en) | User scheduling method and apparatus for TDD multi-input multi-output down emission system | |
| CN102695182A (en) | Communication processing method and base station | |
| CN103491639A (en) | Multipoint coordinated user scheduling method | |
| CN110445518B (en) | Pilot frequency distribution method based on micro cell clustering under large-scale MIMO heterogeneous network system | |
| CN103929225A (en) | Feedback control apparatus, feedback apparatus and multi-user MIMO (multiple input multiple output) feedback method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 |