CN101400139B - Data transmission method and base station in multiple base station collaboration system - Google Patents
Data transmission method and base station in multiple base station collaboration system Download PDFInfo
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Abstract
The invention discloses a data transmission method and a base station in a multi-base station coordinated system, comprising that: when performing user scheduling for a plurality of times, with respect to the terminal of a current transmission retransmission data package in the district, the base station selects the channel information which has large response relativity with the local district terminal channel, small response relativity with the adjacent district terminal channel, and causes the terminal to obtain highest scheduling priority as the channel information corresponding to the terminal; then the base station selects the terminal with the highest scheduling priority to perform data transmission according to the channel information of each terminal in the local district. In the invention, each base station independently performs user scheduling, and realizes partial avoiding of multi-base station interference through updating the channel information.
Description
Technical field
The present invention relates to the communications field, relate in particular to data transmission method and base station in a kind of multi-base station cooperative system.
Background technology
In the existing communication system, HSPA (High Speed Packet Access for example, high-speed packet inserts), 3GPP (3rd Generation Partnership Project, third generation partner program) LTE (Long Term Evolution, Long Term Evolution), multi-subscriber dispatching is independently carried out in each base station.Along with development of Communication Technique, in next generation mobile communication system, for example in 3GPP LTE-Advanced (the further evolution of the 3GPPLTE) system, the average throughput of system and peak rate all will significantly improve 2-3 doubly on the basis of existing speed.In order to realize such target, the method for the cooperation between many sub-districts (many base stations) is a kind of very effective method.Because 3GPP LTE/LTE-Advanced system is an interference limiting system, promptly power system capacity is subject to the interference signal from adjacent cell.And multi-cell cooperating can be alleviated or part is eliminated the interference signal of adjacent cell, thereby can improve the performance of system.
Document " 3GPP TSG RAN WG1 Meeting #54 R1-082886, " Inter-CellInterference Mitigation Through Limited Coordination ", Samsung " in mention way based on three kinds of presence of intercell interference management of LTE/LTE-Advanced system:
(A) presence of intercell interference randomization
When the independence scheduling is carried out in the base station, the interference signal of each unpredictable adjacent cell in base station, because the fading characteristic of channel, can on time domain, frequency domain, change from the interference signal of adjacent cell, thereby cause the Signal to Interference plus Noise Ratio of this community user to worsen.The interference randomization of minizone, by some method signal is handled exactly, for example scrambling, thereby make stack from the interference signal of a plurality of base stations, on time domain, frequency domain, change slowly (based on law of great number), can utilize prior information, improve the accuracy of multi-subscriber dispatching, improve systematic function about disturbing.
(B) inter-cell interference cancellation
By shared channel information between contiguous base station, data message to be sent, carry out preliminary treatment to sent data message, for example precoding (precoding) is partly eliminated the purpose that adjacent cell disturbs thereby reach at user side, to improve systematic function.But this method is bigger to the signaling consumption requirement of system, and how to realize that Real-time Channel information and sharing of data between the base station also do not have solution preferably.Therefore, this method limits bigger in actual applications.
(C) presence of intercell interference is cooperated/is avoided
This method is by part shared channel information between adjacent cell, utilize a central scheduler, perhaps carry out independent scheduling, thereby signal and interference between the adjacent cell are avoided to a certain extent mutually, reduce of the interference of the interference signal of adjacent cell, to improve performance to this sub-district.But shared data not each other between the adjacent cell, the therefore data preliminary treatment that can not unite (sharp as the multi-user pre-coding technology) only can be dispatched according to the user that the channel information that part is shared be adjusted this sub-district.
Multi-subscriber dispatching process in the document under the non-base station collaboration pattern comprises as shown in Figure 1:
101, descending pilot frequency information sends, and the terminal of base station under it covers sends the pseudo random sequence of knowing altogether.
102, channel estimating and feedback, each terminal utilizes pilot frequency information to carry out channel estimating respectively, and CQI (channel quality indicator, channel quality indication) and PMI (perferred matrix index, precedence matrix index) feedback information arrived serving BS.
103, multi-subscriber dispatching, each base station independently carry out user's scheduling, according to corresponding dispatching algorithm, the terminal that selection scheduling priority is the highest.
104, transmission of downlink data and signaling and reception, according to the result of multi-subscriber dispatching, the base station uses the CQI and the PMI of the terminal feedback that is scheduled for that data are carried out modulating-coding and preliminary treatment, then in corresponding downstream Channel Transmission signaling and data.Terminal is carried out operations such as Data Receiving, detection, demodulation, decoding according to the downlink signaling that receives.
In the document under the multi-base station cooperative pattern based on the multi-subscriber dispatching process of disturbing conflict to avoid as shown in Figure 2:
201, terminal UE 1 is measured the channel response of serving BS eNB1 and neighbor base station eNB2 based on pilot frequency information; UE2 measures the channel response of serving BS eNB2 and neighbor base station eNB1 based on pilot frequency information;
Each UE obtains the PMI feedback information of dominant interference sub-district respectively, comprising:
(1) the reference PMI of interfered cell (sub-district, neighbor base station place also can be described as adjacent cell);
(2) PMI of Serving cell (sub-district, serving BS place);
(3) information ξ, one group of PMI (based on the interference level that can tolerate) that indication is recommended;
Each UE is obtained performance improvement value respectively: Δ CQI represents the performance improvement that brings when interfered cell uses the interfered cell recommended with reference to PMI;
202, UE1 feeds back to serving BS eNB1 with above feedback information; UE2 feeds back to serving BS eNB2 with above feedback information;
203, carry out information exchange between eNB1 and eNB2;
204, eNB1 and eNB2 carry out multi-subscriber dispatching, select PMI and relevant terminal, make the throughput-maximized of this terminal;
ENB1 determines UE1 is carried out vector and the matrix that precoding is adopted; ENB2 determines UE2 is carried out vector and the matrix that precoding is adopted;
205, eNB1 sends data to UE1, and eNB2 sends data to UE2.
As seen, the adjacent cell of mentioning in above-mentioned document disturbs in the method for avoiding of conflicting, and needs feedack more, and is bigger with the standard difference of existing 3GPP LTE, if therefore use this method, also needs existing standard is carried out bigger modification.For the method for (C) above-mentioned, because the feedback information that requires in the above-mentioned document is more, therefore up expense is bigger.In addition,, then also need a master scheduling device, the terminal in the sub-district that responsible combined dispatching participates in cooperating if not carrying out independent scheduling.
Summary of the invention
The technical problem to be solved in the present invention provides data transmission method and the base station in a kind of multi-base station cooperative system, and multi-subscriber dispatching can independently be carried out in each base station, and realizes that by upgrading channel information the part of many base station interference avoids.
In order to address the above problem, the invention provides the data transmission method in a kind of multi-base station cooperative system, comprising:
When multi-subscriber dispatching is carried out in each time, for the terminal of current transmission retransmission data packet may in this sub-district, in base station selected and this cell terminal channel response PMI dependence on parameter big, respond with the adjacent cell terminal channel in the PMI dependence on parameter little and make this terminal can obtain the channel information of high dispatching priority upgrades the corresponding channel information of this terminal; Transfer of data is carried out according to the highest terminal of channel information selection scheduling priority of each terminal correspondence of this sub-district in the base station then.
Further, in base station selected and this cell terminal channel response PMI dependence on parameter big, respond with the adjacent cell terminal channel in the PMI dependence on parameter little and make this terminal can obtain the channel information of high dispatching priority to upgrade the corresponding channel information of this terminal and specifically comprise:
The correlation of the PMI1 of selection and this cell terminal feedback is formed S set 1 more than or equal to each PMI of predetermined threshold ρ 1; Each PMI that the correlation of the PMI2 of selection and adjacent cell terminal feedback is less than or equal to threshold value ρ 2 forms S set 2;
Obtain the common factor S of S1 and S2;
For the terminal of each current transmission retransmission data packet may, from S set, select this terminal can access the PMI of the PMI of the highest dispatching priority as this terminal.
Further, ρ 1 is 0.5.
Further, ρ 2 is 0.5.
Further, if S set is an empty set, then make S=S1 or S=S2.
The present invention also provides the base station in a kind of multi-base station cooperative system, comprise: be used for receiving and preserve the receiving element of the channel information that this cell terminal and adjacent cell terminal fed back, the channel information of each terminal correspondence of this sub-district of being used for preserving, the transmitting element of the scheduling unit that the highest terminal of dispatching priority is dispatched, the data after being used to use the channel information of the terminal correspondence that scheduling unit is dispatched to data to be carried out modulating-coding and pretreated data processing unit and be used to send processing according to receiving element; Also comprise: judging unit and scheduling unit;
Described judging unit is used for after receiving the channel information that each terminal is fed back at every turn, and whether what judge the current transmission of each terminal in this sub-district is retransmission data packet may, sends update instruction to updating block at the terminal of current transmission retransmission data packet may;
Described updating block is used for after receiving described update instruction, select with this cell terminal channel response in the PMI dependence on parameter big, with the response of adjacent cell terminal channel in the PMI dependence on parameter little and make the terminal of described current transmission retransmission data packet may can obtain the channel information of high dispatching priority, upgrade the channel information of this terminal correspondence in the receiving element.
Further, updating block select with this cell terminal channel response in the PMI dependence on parameter big, with the response of adjacent cell terminal channel in the PMI dependence on parameter little and make the terminal of described current transmission retransmission data packet may can obtain the channel information of high dispatching priority, the channel information that upgrades this terminal correspondence in the receiving element specifically is meant:
The correlation of the PMI1 of updating block selection and this cell terminal feedback is formed S set 1 more than or equal to each PMI of predetermined threshold ρ 1, and each PMI that the correlation of the PMI2 that selection and adjacent cell terminal are fed back is less than or equal to threshold value ρ 2 forms S set 2; Obtain the common factor S of S1 and S2;
For the terminal of each current transmission retransmission data packet may, updating block selects this terminal can access the PMI that the PMI of high dispatching priority upgrades this terminal in the receiving element from S set.
Further, ρ 1 is 0.5.
Further, ρ 2 is 0.5.
Further, if S set is an empty set, then updating block makes S=S1 or S=S2.
Technical scheme of the present invention is by judging whether HARQ is new data packets, judge under the multi-base station cooperative interference avoidance modes the base station whether the PMI by this cell terminal of change or other parameter to reduce interference to the adjacent cell terminal.The present invention changes very little to existing feedback mechanism, compared with prior art, do not need to feed back information such as extra CQI, threshold value.And each base station can independently judge whether to need to sacrifice the performance of this sub-district to reduce the interference to adjacent cell.Because the packet that HARQ retransmits will merge with former packet, therefore for the packet that retransmits, performance does not need strict assurance.This also is the basis that proposes the solution of the present invention, when this sub-district is the packet that retransmits, starts the PMI update mechanism, when guaranteeing that this estate performance deterioration Be Controlled within the specific limits, reduces the interference to adjacent cell as much as possible.For the terminal that is operated in the multi-base station cooperative pattern, the normally terminal of cell boarder, so Packet Error Ratio is higher usually, and based on the analysis of front, when Packet Error Ratio is higher, the performance gain that the present invention can bring will be more obvious.
Description of drawings
Fig. 1 is the multi-subscriber dispatching flow chart under the non-base station collaboration pattern;
Fig. 2 be under the multi-base station cooperative pattern based on the multi-subscriber dispatching flow chart that disturbs conflict to avoid;
Fig. 3 is the concrete enforcement block diagram of the base station in a kind of multi-base station cooperative provided by the invention system;
Fig. 4 is the schematic block diagram of the multi-base station cooperative modular system of the embodiment of the invention;
Fig. 5 is the multi-subscriber dispatching flow chart of the embodiment of the invention.
Embodiment
The scene that the present invention is primarily aimed at is in the 3GPP LTE-Advanced system, the situation that adopts multi-base station cooperative to disturb conflict to avoid, the channel information of part sharing users between a plurality of base stations of promptly passing through to cooperate, adjust user's scheduling of this sub-district according to the channel information that part is shared, thereby reach reduction facing the purpose of area interference.In addition, for the method that needs a master scheduling device in the existing method, though this master scheduling device can be and a plurality of base stations entity independently also can be in the base station of a plurality of participations cooperations; But how to determine this master scheduling device, this master scheduling device needs those extra resources, configuration etc., all is the problem that needs solution, and how to realize real-time communication between a plurality of base stations, remains insoluble realistic problem.Therefore, method provided by the invention is based in the multi-base station cooperative, participates in the base station portion shared channel information of cooperation, independently carries out the scene of multi-subscriber dispatching.Hereinafter the adjacent cell of indication is meant and participates in the sub-district at each place, base station of cooperation except this base station in many base stations (many sub-districts) cooperation.
Existing multi-base station cooperative method is not all considered HARQ (Hybrid Automatic RepeatreQuest mixes automatically retransmitting).HARQ is the method for error data packets being transmitted again in order to guarantee quality of service.Because always there are error data packets in the unpredictability and the fading characteristic of channel, therefore retransmit, thereby guarantee quality of service by HARQ mechanism.For simplifying the analysis, participate in cooperation with two base stations and analyze, suppose that the user's of two base station current service Packet Error Ratio is respectively P1, P2,0＜=P1, P2＜=1, then two of two base station current service user's while probability of errors are PA=P1*P2, and the user of two base station current service only has a probability of errors to be positioned at interval PB ∈ [max (P1, P2), P1+P2], [a wherein, b] interval of expression scope from a to b, max (c, d) maximum among expression parameter c and the d.Because 0＜=P1, P2＜=1, so PB〉PA, for example when P1=P2=0.1, PA=0.01, PB ∈ [0.1,0.2], PB at this moment 〉=10*PA.Therefore, in most of the cases, compare with two users' while probability of errors of two base station current service, the user of two base station current service only has a probability of errors to want big.Especially under the multi-base station cooperative pattern, participate in users in collaboration and all be positioned at cell boarder, because Packet Error Ratio is bigger, so PB/PA is just bigger.By that analogy, the user of many base stations current service only has a probability of errors bigger than a plurality of user's probability of errors.
Whether the core concept of technical scheme of the present invention is: when multi-subscriber dispatching is carried out in the base station that participates in cooperation, be retransmission data packet may by judging current packet, determine whether initiatively to reduce the interference to adjacent cell.If retransmission data packet may, the scheduling thought of this moment is the interference that reduces as much as possible adjacent cell; Because for the packet that retransmits, terminal merges the packet of re-transmission and the packet of initial transmission, reduces Packet Error Ratio by diversity gain is provided.Therefore,, do not need its performance of point-device assurance, select to carry out the scheduling of HARQ bag greatly and with adjacent cell correlation PMI little, that priority is the highest with this sub-district correlation for retransmission data packet may.
The invention provides the data transmission method in a kind of multi-base station cooperative system, be applicable to the base station portion shared channel information that participates in cooperation, independently carry out the situation of multi-subscriber dispatching, comprising:
When multi-subscriber dispatching is carried out in each time, for the terminal of current transmission retransmission data packet may in this sub-district, base station selected and this cell terminal channel response correlation be big, with the adjacent cell terminal channel respond correlation little and make this terminal can obtain the channel information of high dispatching priority upgrades the corresponding channel information of this terminal; Transfer of data is carried out according to the highest terminal of channel information selection scheduling priority of each terminal correspondence of this sub-district in the base station then.
Optionally, base station selected and this cell terminal channel response correlation are big, to respond correlation little and make this terminal can obtain the channel information of high dispatching priority to upgrade the corresponding channel information of this terminal and specifically can comprise with the adjacent cell terminal channel:
The base station selected PMI that feeds back with this cell terminal
1Correlation form S set 1 more than or equal to each PMI of predetermined threshold ρ 1; Select PMI with adjacent cell terminal feedback
2Correlation each PMI of being less than or equal to threshold value ρ 2 form S set 2;
Obtain the common factor S of S1 and S2;
For the terminal of each current transmission retransmission data packet may, from S set, select this terminal can access the PMI of the PMI of the highest dispatching priority respectively as this terminal.
Certainly, during practical application, upgrade channel information and be not limited to only refer to upgrade PMI,, adjust pre-coding matrix according to the CQI after upgrading then such as also upgrading CQI; Or directly upgrade pre-coding matrix.
For ρ 1, be used to select the PMI stronger, therefore when ρ 1 is big with the PMI correlation of current cell terminal, for example 0.8,0.9 the PMI correlation of then selecteed PMI and current cell terminal is stronger, this moment is because the mis-behave that change PMI brings is less; For ρ 2, be used to select the PMI more weak with the PMI correlation of current adjacent cell terminal, therefore when ρ 2 hour, for example 0.4,0.5, the PMI correlation of then selecteed PMI and current adjacent cell terminal a little less than, at this moment less to the interference of adjacent cell.The selection of ρ 1, ρ 2 can rule of thumb be worth or simulation value obtains, can be identical or different.
Optionally, ρ 1 can but be not limited to 0.5.
Optionally, ρ 2 can but be not limited to 0.5.
Optionally, if S set is an empty set, then can simply make S=S1 or S=S2.
Optionally, the base station according to the highest terminal of channel information selection scheduling priority of this each terminal of sub-district carry out transfer of data can but be not limited to handle by prior art, such as handling according to top step 103,104; The channel response that it should be noted that the terminal of current transmission retransmission data packet may this moment no longer is the channel information that this terminal is fed back, but the channel information after the renewal of base station.
Optionally, be not the terminal of retransmission data packet may for current data packets for transmission, then can but be not limited to handle by prior art, directly utilize the channel information of its feedback to dispatch.
Optionally, when multi-subscriber dispatching is carried out in each time, also comprise judging before whether current data packets for transmission is retransmission data packet may:
The base station sends pilot frequency sequence to the terminal of this sub-district and the terminal of adjacent cell; Here can but be not limited to be undertaken by prior art;
Receive that respectively the terminal of pilot frequency sequence estimates the channel response of this terminal according to this pilot frequency sequence, and give the base station as feedback of channel information the estimated result of channel response; Here can but be not limited to be undertaken by prior art.
The present invention also provides the base station in a kind of multi-base station cooperative system, comprising: the receiving element that is used to receive and preserve the channel information that this cell terminal and adjacent cell terminal fed back; The channel information of each the terminal correspondence of this sub-district that is used for preserving according to receiving element, the scheduling unit that the highest terminal of dispatching priority is dispatched; Be used for using receiving element, the transmitting element of the data after the channel information of the terminal correspondence that scheduling unit was dispatched to carries out modulating-coding and pretreated data processing unit to data and is used to send processing; The realization of said units can but be not limited to same as the prior art.
Also comprise: judging unit and updating block;
Described judging unit is used for after receiving the channel information that each terminal is fed back at every turn, and whether what judge the current transmission of each terminal in this sub-district is retransmission data packet may, sends update instruction to updating block at the terminal of current transmission retransmission data packet may;
Described updating block is used for after receiving described update instruction, select greatly with this cell terminal channel response correlation, little and make the terminal of described current transmission retransmission data packet may can obtain the channel information of high dispatching priority, upgrade the channel information of this terminal correspondence in the receiving element with adjacent cell terminal channel response correlation.
Optionally, that described updating block is selected is big with this cell terminal channel response correlation, little and make the terminal of described current transmission retransmission data packet may can obtain the channel information of high dispatching priority with adjacent cell terminal channel response correlation, the channel information that upgrades this terminal correspondence in the receiving element specifically can be meant:
Updating block is selected the PMI with this cell terminal feedback
1Correlation form S set 1 more than or equal to each PMI of predetermined threshold ρ 1, select PMI with adjacent cell terminal feedback
2Correlation each PMI of being less than or equal to threshold value ρ 2 form S set 2; Obtain the common factor S of S1 and S2;
For the terminal of current transmission retransmission data packet may, updating block selects this terminal can access the PMI that the PMI of high dispatching priority upgrades this terminal in the receiving element from S set.
Optionally, ρ 1 can but be not limited to 0.5.
Optionally, ρ 2 can but be not limited to 0.5.
Optionally, if S set is an empty set, then updating block can make S=S1 or S=S2.
Optionally, described transmitting element also is used to send pilot frequency sequence to the terminal of this sub-district and the terminal of adjacent cell.
Other realizes that details can be with described in the method.
Further be illustrated with one embodiment of the present of invention below.
The application scenarios of embodiment 1 as shown in Figure 4; Suppose that current base station A and base station B are operated in the pattern that multi-base station cooperative disturbs conflict to avoid, sub-district, terminal A access base station A place, sub-district, terminal B access base station B place.Terminal A and terminal B are in multi-base station cooperative pattern, H
AABe the channel response of base station A to terminal A, H
ABBe the channel response of base station A to terminal B, H
BABe the channel response of base station B to terminal A, H
BBBe the channel response of base station B to terminal B.Suppose the retransmission data packet may that is of the current transmission of terminal A.
Under the restriction that partial channel knowledge is shared, base station A can obtain H
AAAnd H
AB, base station B can obtain H
BAAnd H
BBHow to obtain corresponding channel information for base station A and base station B, can but be not limited to use existing correlation method, irrelevant with key point of the present invention.
This embodiment comprises as shown in Figure 5:
501, descending pilot frequency information sends, and the terminal of base station under it covers sends the pseudo random sequence of knowing altogether.
502, channel estimating and feedback, each terminal utilize pilot frequency information to carry out channel estimating, and CQI and PMI feedback information are arrived serving BS.Wherein, for channel H
AA, be by terminal A feedback CQI
AAAnd PMI
AAGive base station A, other channel is analogized.
503, each base station judges one by one whether the current transfer of data of each terminal is new data packets, so to the terminal of new data packets, forward 504 to and handle; So the terminal to retransmission data packet may forwards 505 to.
504, do not need to consider interference this moment, based on the thought of protecting new data packets as far as possible, directly with the channel information of terminal feedback channel information as this terminal correspondence to adjacent sub-district; Carry out 506.
505, serving BS according to current transmission to the interference of adjacent sub-district (according to the PMI of adjacent cell terminal feedback
AB), based on predefined threshold value ρ 1, ρ 2, and dispatch terminal is that corresponding PMI makes the dispatching priority of the terminal that needs retransmission data packet may the highest; Wherein this user's PMI should select in following scope;
S＝S1∩S2
S1={PMI
k, PMI
kAnd PMI
AACorrelation more than or equal to ρ 1}
S2={PMI
k, PMIk and PMI
ABCorrelation be less than or equal to ρ 2}
Wherein corresponding PMI represents PMI with user A feedback in the S set 1
AAThe PMI that correlation is bigger, thus the deterioration that guarantees the performance of user A is limited within certain scope; The set of S set 2 correspondences represent wherein PMI with to the interference PMI of adjacent sub-district
ABBetween correlation less than thresholding ρ 2, i.e. interference to adjacent cell is limited within certain scope.Therefore, the present invention guarantees to reduce as far as possible the interference to adjacent sub-district when the deterioration of this cell signal is little.
Suppose that terminal A and user B are current user's combinations of attempting; Number of transmit antennas is 2, and pre-coding matrix is W=[1 1; 1 (1-j)/sqrt (2); 1-j; 1 (1-j)/sqrt (2); 1-1; 1 (1+j)/sqrt (2); 1 j; 1 (1+j)/sqrt (2); ] ./sqrt (2), this precoding code book comprises the vector of 8 2*1.The PMI=1 of terminal A feedback is promptly corresponding to vector [1 1] ./sqrt (2); The PMI=4 of terminal B feedback is promptly corresponding to vector [1 (1-j)/sqrt (2)] ./sqrt (2).ρ1＝ρ2＝0.5。The correlation matrix of pre-coding matrix W is as follows:
Correlation(W，W)＝
1.0000 0.9239 0.7071 0.3827 0 0.3827 0.7071 0.9239
0.9239 1.0000 0.9239 0.7071 0.3827 0.0000 0.3827 0.7071
0.7071 0.9239 1.0000 0.9239 0.7071 0.3827 0.0000 0.3827
0.3827 0.7071 0.9239 1.0000 0.9239 0.7071 0.3827 0.0000
0 0.3827 0.7071 0.9239 1.0000 0.9239 0.7071 0.3827
0.3827 0.0000 0.3827 0.7071 0.9239 1.0000 0.9239 0.7071
0.7071 0.3827 0.0000 0.3827 0.7071 0.9239 1.0000 0.9239
0.9239 0.7071 0.3827 0.0000 0.3827 0.7071 0.9239 1.0000
In the A scheduling process of base station, calculate and attempt in the terminal A, S1={PMI=1,2,3,7,8} is (as first, second and third row in top correlation matrix first row, and last, two row shown in), S2={PMI=1,7,8} is (as first row in the top correlation matrix fourth line, and shown in last, the secondary series), so S={PMI=1,7,8}, at this moment, for terminal A, from S, select to make terminal A can access the PMI of high dispatching priority, and with the dispatching priority of the selected PMI correspondence scheduling result as terminal A; Base station A attempts the terminal of other current transmission retransmission data packet may among the A of sub-district again with identical method then.
Base station B also operates with identical method; Execution in step 506 then.
506, the scheduling result of the relatively more all terminal in base station, the therefrom the highest terminal of selection scheduling priority; Promptly carry out:
{ UE (being dispatched to), PMI}=arg
{ all user k, the PMI S set (k) of each user's correspondence }Max R (user k, S (k))
Wherein R (user k, S (k)) expression user K is corresponding to the priority of the PMI in the S set (k);
The definition of concrete dispatching priority depends on corresponding dispatching algorithm; This step can but be not limited to carry out according to existing mode (such as the step 103 of preamble).
507, transmission of downlink data and signaling and reception, base station use the CQI and the PMI of the terminal that is scheduled for that the data of current transmission are carried out modulating-coding and preliminary treatment, then in corresponding downstream Channel Transmission signaling and data according to the result of multi-subscriber dispatching.Terminal is carried out operations such as Data Receiving, detection, demodulation, decoding according to the downlink signaling that receives.This step can but be not limited to carry out according to existing mode (such as the step 104 of preamble).
It is pointed out that if the current transmission of terminal that is scheduled for for new data packets, then can adopt the CQI and the PMI of this terminal feedback carry out modulating-coding and preliminary treatment by prior art; And if the current transmission of terminal that is scheduled for for retransmission data packet may because that consider during scheduling is PMI after the base station is upgraded, therefore also be to adopt the PMI after the base station is upgraded to carry out modulating-coding and preliminary treatment this moment.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of claim of the present invention.
Claims (10)
1. the data transmission method in the multi-base station cooperative system comprises:
When multi-subscriber dispatching is carried out in each time, for the terminal of current transmission retransmission data packet may in this sub-district, in base station selected and this cell terminal channel response PMI dependence on parameter big, respond with the adjacent cell terminal channel in the PMI dependence on parameter little and make this terminal can obtain the channel information of high dispatching priority upgrades the corresponding channel information of this terminal; Transfer of data is carried out according to the highest terminal of channel information selection scheduling priority of each terminal correspondence of this sub-district in the base station then.
2. data transmission method as claimed in claim 1, it is characterized in that, in base station selected and this cell terminal channel response PMI dependence on parameter big, respond with the adjacent cell terminal channel in the PMI dependence on parameter little and make this terminal can obtain the channel information of high dispatching priority to upgrade the corresponding channel information of this terminal and specifically comprise:
Select PMI with this cell terminal feedback
1Correlation form S set 1 more than or equal to each PMI of predetermined threshold ρ 1; Select PMI with adjacent cell terminal feedback
2Correlation each PMI of being less than or equal to threshold value ρ 2 form S set 2;
Obtain the common factor S of S1 and S2;
For the terminal of each current transmission retransmission data packet may, from S set, select this terminal can access the PMI of the PMI of the highest dispatching priority as this terminal.
3. data transmission method as claimed in claim 2 is characterized in that: ρ 1 is 0.5.
4. data transmission method as claimed in claim 2 is characterized in that: ρ 2 is 0.5.
5. data transmission method as claimed in claim 2 is characterized in that:
If S set is an empty set, then make S=S1 or S=S2.
6. the base station in the multi-base station cooperative system, comprise: be used for receiving and preserve the receiving element of the channel information that this cell terminal and adjacent cell terminal fed back, the channel information of each terminal correspondence of this sub-district of being used for preserving, the transmitting element of the scheduling unit that the highest terminal of dispatching priority is dispatched, the data after being used to use the channel information of the terminal correspondence that scheduling unit is dispatched to data to be carried out modulating-coding and pretreated data processing unit and be used to send processing according to receiving element; It is characterized in that, also comprise:
Judging unit and scheduling unit;
Described judging unit is used for after receiving the channel information that each terminal is fed back at every turn, and whether what judge the current transmission of each terminal in this sub-district is retransmission data packet may, sends update instruction to updating block at the terminal of current transmission retransmission data packet may;
Described updating block is used for after receiving described update instruction, select with this cell terminal channel response in the PMI dependence on parameter big, with the response of adjacent cell terminal channel in the PMI dependence on parameter little and make the terminal of described current transmission retransmission data packet may can obtain the channel information of high dispatching priority, upgrade the channel information of this terminal correspondence in the receiving element.
7. base station as claimed in claim 6, it is characterized in that, updating block select with this cell terminal channel response in the PMI dependence on parameter big, with the response of adjacent cell terminal channel in the PMI dependence on parameter little and make the terminal of described current transmission retransmission data packet may can obtain the channel information of high dispatching priority, the channel information that upgrades this terminal correspondence in the receiving element specifically is meant:
Updating block is selected the PMI with this cell terminal feedback
1Correlation form S set 1 more than or equal to each PMI of predetermined threshold ρ 1, select PMI with adjacent cell terminal feedback
2Correlation each PMI of being less than or equal to threshold value ρ 2 form S set 2; Obtain the common factor S of S1 and S2;
For the terminal of each current transmission retransmission data packet may, updating block selects this terminal can access the PMI that the PMI of high dispatching priority upgrades this terminal in the receiving element from S set.
8. base station as claimed in claim 7 is characterized in that: ρ 1 is 0.5.
9. base station as claimed in claim 7 is characterized in that: ρ 2 is 0.5.
10. base station as claimed in claim 7 is characterized in that:
If S set is an empty set, then updating block makes S=S1 or S=S2.
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Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101868035B (en) * | 2009-04-14 | 2015-04-01 | 中兴通讯股份有限公司 | Multipoint cooperative transmission system and method thereof |
| CN101909334B (en) * | 2009-06-02 | 2013-03-27 | 晨星软件研发(深圳)有限公司 | Wireless communication method and system thereof for updating reference channel information |
| US8670432B2 (en) * | 2009-06-22 | 2014-03-11 | Qualcomm Incorporated | Methods and apparatus for coordination of sending reference signals from multiple cells |
| US8666318B2 (en) * | 2009-06-24 | 2014-03-04 | Motorola Mobility Llc | Method and apparatus for managing cellular uplink transmissions |
| CN101989894B (en) * | 2009-07-31 | 2013-10-09 | 华为技术有限公司 | Cooperative communication method, equipment and system |
| US8386876B2 (en) * | 2009-08-14 | 2013-02-26 | Sharp Laboratories Of America, Inc. | Transmission of different redundancy versions on different degrees of freedom |
| CN102013903B (en) * | 2009-09-29 | 2013-11-06 | 电信科学技术研究院 | Method and equipment for space coordination among cells |
| CN101795496B (en) * | 2009-10-27 | 2012-10-10 | 清华大学 | Dispatching method and system of multi-BS (base station) multi-user network |
| CN102104963B (en) * | 2009-12-17 | 2014-03-12 | 中兴通讯股份有限公司 | Method and system for coordinately scheduling in multi-point coordinated transmission |
| CN102122977B (en) * | 2010-01-11 | 2013-12-04 | 电信科学技术研究院 | Method for feeding back CQI (Channel Quality Indicator) information and channel quality estimation, user terminal and base station |
| CN101801039B (en) * | 2010-03-29 | 2012-07-04 | 华中科技大学 | Method for reducing delay in multiple base station cooperation |
| CN102025464B (en) * | 2010-12-21 | 2017-03-15 | 中兴通讯股份有限公司 | The method and system that a kind of downlink multi-base-station multiple-input, multiple-output precoding is coordinated |
| CN102065434B (en) * | 2011-01-06 | 2015-10-21 | 中兴通讯股份有限公司 | A kind of coordination approach of downlink multi-base-station multiple-input and multiple-output precoding and device |
| CN102196587B (en) * | 2011-03-10 | 2015-04-15 | 东南大学 | Wireless-resource-dispatching method during multi-cell cooperation in relay-aided communication system |
| CN103975638A (en) * | 2011-11-07 | 2014-08-06 | 瑞典爱立信有限公司 | Downlink transmission coordinated scheduling |
| US9386594B2 (en) | 2011-11-07 | 2016-07-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Downlink transmission coordinated scheduling |
| KR102008331B1 (en) | 2012-05-31 | 2019-08-07 | 삼성전자주식회사 | Apparatus and method of cooperating with multiple base stations in wireless communication system |
| US10044487B2 (en) | 2012-11-30 | 2018-08-07 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Interference management in wireless multi-access communication networks |
| CN104066193A (en) * | 2014-06-06 | 2014-09-24 | 电信科学技术研究院 | Scheduling method and device |
| CN108322242A (en) * | 2017-12-29 | 2018-07-24 | 上海华为技术有限公司 | A kind of interference control method, device, user equipment, base station and system |
| CN111464234B (en) * | 2020-06-10 | 2021-08-24 | 网络通信与安全紫金山实验室 | Low-orbit satellite communication performance enhancement method and system based on multi-satellite cooperation |
| CN112636877B (en) * | 2020-12-18 | 2021-07-06 | 深圳市微网力合信息技术有限公司 | Data transmission method, system and terminal based on wifi6 |
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