CN102025465A - Communication method under cooperation of multiple base stations based on user pairing - Google Patents
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Abstract
The invention relates to a communication method under cooperation of multiple base stations based on user pairing, belonging to the technical field of wireless communication. The method comprises the following steps: grouping users and antennae of multiple base stations according to information on users and channels among cooperating base stations, and determining the antenna sets for carrying out combined signal processing and determining which antenna set serves each user; and paring the users in each antenna set to constitute virtual MIMO, thereby carrying out information transfer. On the basis of cooperation of multiple base stations, the method introduces more antennae so as to bring more degree of freedom and supports flexible antenna configuration, so that the system can obtain better communication quality at lower cost through user pairing.
Description
Technical field
The present invention relates to a kind ofly, belong to wireless communication technology field based on the communication means under the multi-base station cooperative of user pairing.
Background technology
In the LTE-Advance of identical networking system, interference among adjacent cells has limited the service quality and the throughput of Cell Edge User.For the availability of frequency spectrum of further raising system, improve the service quality and the throughput of Cell Edge User, must adopt correlation technique to reduce the interference of minizone effectively.Coordinate multipoint in the wireless communication field (Coordinative Multiple Point, hereinafter to be referred as CoMP) transmission technology is the technology that present LTE-Advanced has bright prospects, it can avoid or reduce presence of intercell interference effectively on the basis that keeps system high-frequency spectrum utilance as far as possible.The networking model that is based on BBU+RRU that the CoMP model is the most frequently used, be similar to the spaced antenna technology of knowing traditionally, 1 base station connects a plurality of antenna websites by radio frequency optical fiber (hereinafter to be referred as RoF), similar 1 the wireless remote unit of antenna website (hereinafter to be referred as RRU), and all Base-Band Processing still concentrate on the base station, form the Base Band Unit of concentrating (hereinafter to be referred as BBU).
Multiple-input and multiple-output (hereinafter to be referred as MIMO) technology is the important transmission technology of future broadband wireless communication systems air interface, by disposing a plurality of reception antennas simultaneously at transmitting terminal and receiving terminal, can improve channel capacity significantly.In the CoMP system up-link, will adopt a kind of special MIMO technology, it is up virtual MIMO (hereinafter to be referred as V-MIMO) technology, user's pairing is an important and unique link in the V-MIMO system, and promptly two or more single antenna users of base station selection form the V-MIMO transmission.Because signal is from different users, through different channels, the degree difference that interferes with each other between the user, therefore, have only by effective user and match process, could obtain the multi-user diversity gain of V-MIMO system better, and make the phase mutual interference minimum between the pairing user, the reliability and the robustness of transmission of radio links after the assurance cooperation.
Very limited about the research of user's pairing both at home and abroad at present, major part belongs to random pair algorithm and quadrature pairing algorithm.User's matching method commonly used has following several:
Quadrature pairing: select the user of two channel orthogonality maximums to match.The advantage of this method is that computation complexity is lower; Shortcoming is that the base station need know that all will be by pairing user's channel condition information, and only considered the orthogonality of mimo channel matrix self, consider pairing user signal to noise ratio separately, promptly do not consider because disturb, the network planning is improper or problem such as certain areas deep fading.
Random pair: pairing user's selection generates at random, and this matching method uses commonplace at present.Advantage is that matching method is simple, and complexity is low, and amount of calculation is little; Shortcoming is rationally to utilize the channel matrix characteristic, can't reach maximum channel capacity, can't obtain multi-user diversity gain.
The determinant pairing: by dispatching algorithm, select any user, calculate the determinant factor after every other user and this user match, selection determinant factor maximum, finish pairing with this user.The advantage of this algorithm is to have considered channel capacity, and computation complexity is lower, and shortcoming is not strong to low adaptability, channel capacity is expressed also not putting in place fully.
Match based on signal noise ratio (hereinafter to be referred as SNR): propose a kind of with the user according to its SNR grouping, at the algorithm of not taking corresponding pairing criterion on the same group.Simultaneously, number of users is very few in a certain group, and the situation that multi-user diversity gain is on the low side is introduced the marginal utility function, the user who allows part to meet the demands, and it is right to stride assembly.
Pairing based on path loss and slow fading ordering: user's path loss is added the slow fading value and sort, the adjacent user in back matches to sorting.This matching method is simple, complexity is low, moves slowly the user, under the situation, user's pair frequency again also can reduce slowly for path loss and slow fading, and since pairing user path loss to add the slow fading value close, also reduced the possibility of user's generation " distance " effect.Shortcoming is that pairing subscriber channel correlation may be bigger, and the interference ratio between the pairing user is bigger.
Summary of the invention
The objective of the invention is to propose a kind of based on the communication means under the multi-base station cooperative of user's pairing, at first the antenna of user and many base stations is carried out packet transaction according to the channel information between user and each base station of cooperating, determine to carry out the antenna set that allied signal is handled, and each user by which antenna set is served, user in each antenna set carries out user's pairing, form virtual MIMO and carry out the transmission of information, to improve the performance of system.
The present invention propose based on the communication means under the multi-base station cooperative of user's pairing, may further comprise the steps:
(1) be located in the communication system, carry out multi-base station cooperative by M base station, N user arranged under the multi-base station cooperative, N user's set is { UE
1, UE
2..., UE
N, each user has L root antenna, and then the set of all users' antenna is { AUE
1, AUE
2..., AUE
N * L, wherein subscript is represented the user antenna numbering, the set of M base station is { BS
1, BS
2..., BS
M, there is K root antenna each base station, and then all antenna for base station set are { ASB
1, ASB
2..., ABS
M * K, wherein subscript is represented the antenna for base station numbering;
(2) according to the user to the uplink pilot signal of base station or user channel condition information to base station feedback, the base station obtains the channel information { H between each base station and each user
Ij, H wherein
IjRepresent the channel information of i user to j base station;
(3) according to above-mentioned channel information { H
Ij, match to antenna for base station and user antenna the base station, and detailed process is as follows:
(3-1) according to virtual multiple-input and multiple-output MIMO antenna configurations and the user side number of antennas stipulated in the communication protocol, the every a of a base station sets user and Q
jThe foundation station antenna forms one group of virtual MIMO, divides antenna for base station by this and is divided into the group into S, and then the number of antennas of every group of virtual MIMO is (a * L) * Q
j, Q wherein
jBe the number of antennas of base station end in the i group virtual MIMO, satisfy Q
j〉=a * L, the number of users corresponding with every group of antenna for base station is
Be designated as p;
(3-2) carrying out the antenna set that allied signal handles between the base station sets base station is
Wherein subscript is represented the antenna label in antenna set label and the antenna set, and S antenna set arranged altogether, and the setting antenna for base station set corresponding with each user is numbered { Index
1, Index
2..., Index
N, 1≤Index wherein
i≤ S represents to the antenna set numbering corresponding with i user, according to channel condition information { H
IjEach user and antenna for base station set are matched;
(4) the pairing result { l|Index that gathers according to s antenna for base station in the user of step (3) and S the antenna for base station set
l=s} divides into groups to l user in the antenna for base station set s, forms virtual MIMO and carries out the information transmission, and detailed process is as follows:
(4-1) to gathering the user of s pairing, according to channel condition information { H with antenna for base station
IjCarry out user grouping;
(4-2) travel through each user and organize interior user, carry out the communication that each user organizes virtual MIMO.
The multi-base station cooperative communication means down based on user's pairing that the present invention proposes is followed traditional user to match algorithm and is compared, and has the following advantages:
1,, can effectively improve the communication quality of cell edge based on multi-base station cooperative.
2, in the inventive method, multi-base station cooperative is introduced more antennas, brings more freedom, has further promoted the performance of virtual MIMO.
3, the inventive method is supported the flexible antenna configuration, adjusts the division that antenna is gathered according to different channel conditions, obtains better communication performance.
4, the inventive method is matched by the user, and the system that makes can form high level MIMO system with littler expense (reference signal etc.).
Description of drawings
Fig. 1 is the FB(flow block) of the inventive method.
Fig. 2 is the communication scenes schematic diagram of an embodiment of the inventive method.
Embodiment
The present invention propose based on the communication means under the multi-base station cooperative of user's pairing, its FB(flow block) may further comprise the steps as shown in Figure 1:
(1) be located in the communication system, carry out multi-base station cooperative by M base station, N user arranged under the multi-base station cooperative, N user's set is { UE
1, UE
2..., UE
N, each user has L root antenna, and then the set of all users' antenna is { AUE
1, AUE
2..., AUE
N * L, wherein subscript is represented the user antenna numbering, the set of M base station is { BS
1, BS
2..., BS
M, there is K root antenna each base station, and then all antenna for base station set are { ASB
1, ASB
2..., ABS
M * K, wherein subscript is represented the antenna for base station numbering;
(2) according to the user to the uplink pilot signal of base station or user channel condition information to base station feedback, the base station obtains the channel information { H between each base station and each user
Ij, H wherein
IjRepresent the channel information of i user to j base station;
(3) according to above-mentioned channel information { H
Ij, match to antenna for base station and user antenna the base station, and detailed process is as follows:
(3-1) according to virtual multiple-input and multiple-output MIMO antenna configurations and the user side number of antennas stipulated in the communication protocol, the every a of a base station sets user and Q
jThe foundation station antenna forms one group of virtual MIMO, divides antenna for base station by this and is divided into the group into S, and then the number of antennas of every group of virtual MIMO is (a * L) * Q
j, Q wherein
jBe the number of antennas of base station end in the j group virtual MIMO, satisfy Q
j〉=a * L, the number of users corresponding with every group of antenna for base station is
Be designated as p;
(3-2) carrying out the antenna set that allied signal handles between the base station sets base station is
Wherein subscript is represented the antenna label in antenna set label and the antenna set, and S antenna set arranged altogether, and the setting antenna for base station set corresponding with each user is numbered { Index
1, Index
2..., Index
N, 1≤Index wherein
i≤ S represents to the antenna set numbering corresponding with i user, according to channel condition information { H
IjEach user and antenna for base station set are matched;
(4) the pairing result { l|Index that gathers according to s antenna for base station in the user of step (3) and S the antenna for base station set
l=s} divides into groups to l user in the antenna for base station set s, forms virtual MIMO and carries out the information transmission, and detailed process is as follows:
(4-1) to gathering the user of s pairing, according to channel condition information { H with antenna for base station
IjCarry out user grouping;
(4-2) travel through each user and organize interior user, carry out the communication that each user organizes virtual MIMO.
Below introduce an embodiment of the inventive method: present embodiment is with two base stations (every base station two antennas), four users (every user's single antenna), the virtual MIMO that one group of per two user and antenna for base station composition are two 2 * 2 is combined as the specific operation process that example explanation patent is carried multi-user's matching method, and the present embodiment schematic diagram as shown in Figure 2.
(1) four user's set is { UE
1, UE
2, UE
3, UE
4, antenna of each user, then the set of the antenna of user side is { AUE
1, AUE
2, AUE
3, AUE
4, subscript is represented the user antenna numbering; The set of two base stations is { BS
1, BS
2, two antennas in each base station, then many antenna for base station set are { ABS
1, ABS
2, ABS
3, ABS
4, subscript is represented the antenna for base station numbering;
(2) according to the user to the uplink pilot signal of base station or user channel condition information to base station feedback, the base station obtains the channel information between each base station and each user.Present embodiment is chosen the channel fading coefficient as required channel condition information, obtains
H wherein
IjRepresent the channel fading coefficient of i user to j base station.
(3) according to above-mentioned channel information { H
Ij, it is as follows that detailed process is matched to antenna for base station and user antenna in the base station:
(3-1) according to virtual multiple-input and multiple-output MIMO antenna configurations and the user side number of antennas stipulated in the communication protocol, per two users of base station sets and two foundation station antennas form one group of virtual MIMO, being divided into by this division antenna for base station is two groups, and then the number of antennas of every group of virtual MIMO is 2 * 2.So parameter setting a=2, Q
j=2, S=2, p=2;
(3-2) carry out the antenna set that allied signal handles between the base station sets base station and be { { ABS
1,1, ABS
1,2, { ABS
2,1, ABS
2,2, wherein subscript is represented the antenna label in antenna set label and the antenna set, and two antenna set are arranged altogether, and the setting antenna for base station set corresponding with each user is numbered { Index
1, Index
2, Index
3, Index
4, 1≤Index wherein
iThe antenna set numbering that≤2 expressions are served i user.According to channel condition information { H
IjEach user and antenna for base station set are matched.Present embodiment is an example with the determinant criterion, and it is multiplexing to suppose to adopt frequency division/time division way to carry out for the information transmission between group, then by selecting
Carry out user's pairing, wherein H
Ij, mnCapable and m is listed as the second order principal minor that the n row constitute by the capable j of i of H in expression; M ≠ n ≠ o ≠ p.；
(4) according to the user of step (3) and the pairing result { l|Index of antenna for base station set s
l=s} divides into groups to l user in the antenna for base station set s, forms virtual MIMO and carries out the information transmission, and detailed process is as follows:
(4-1) to gathering the user of s pairing, according to channel condition information { H with antenna for base station
IjCarry out user grouping; Be example with the determinant criterion equally, the criterion of carrying out user grouping in this set is
Be divided into for
Individual user's group.
(4-2) travel through each user and organize interior user, carry out the communication that each user organizes virtual MIMO.
Claims (1)
1. one kind based on the communication means under the multi-base station cooperative of user pairing, it is characterized in that this method may further comprise the steps:
(1) be located in the communication system, carry out multi-base station cooperative by M base station, N user arranged under the multi-base station cooperative, N user's set is { UE
1, UE
2..., UE
N, each user has L root antenna, and then the set of all users' antenna is { AUE
1, AUE
2..., AUE
N * L, wherein subscript is represented the user antenna numbering, the set of M base station is { BS
1, BS
2..., BS
M, there is K root antenna each base station, and then all antenna for base station set are { ABS
1, ABS
2..., ABS
M * K, wherein subscript is represented the antenna for base station numbering;
(2) according to the user to the uplink pilot signal of base station or user channel condition information to base station feedback, the base station obtains the channel information { H between each base station and each user
Ij, H wherein
IjRepresent the channel information of i user to j base station;
(3) according to above-mentioned channel information { H
Ij, match to antenna for base station and user antenna the base station, and detailed process is as follows:
(3-1) according to virtual multiple-input and multiple-output MIMO antenna configurations and the user side number of antennas stipulated in the communication protocol, the every a of a base station sets user and Q
jThe foundation station antenna forms one group of virtual MIMO, divides antenna for base station by this and is divided into the group into S, and then the number of antennas of every group of virtual MIMO is (a * L) * Q
j, Q wherein
jBe the number of antennas of base station end in the j group virtual MIMO, satisfy Q
j〉=a * L, the number of users corresponding with every group of antenna for base station is
Be designated as p;
(3-2) carrying out the antenna set that allied signal handles between the base station sets base station is
Wherein subscript is represented the antenna label in antenna set label and the antenna set, and S antenna set arranged altogether, and the setting antenna for base station set corresponding with each user is numbered { Index
1, Index
2..., Index
N, 1≤Index wherein
i≤ S represents to the antenna set numbering corresponding with i user, according to channel condition information { H
IjEach user and antenna for base station set are matched;
(4) the pairing result { l|Index that gathers according to s antenna for base station in the user of step (3) and S the antenna for base station set
l=s} divides into groups to l user in the antenna for base station set s, forms virtual MIMO and carries out the information transmission, and detailed process is as follows:
(4-1) to gathering the user of s pairing, according to channel condition information { H with antenna for base station
IjCarry out user grouping;
(4-2) travel through each user and organize interior user, carry out the communication that each user organizes virtual MIMO.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647765A (en) * | 2011-04-21 | 2012-08-22 | 北京邮电大学 | Switching method for transmission mode of coordinated multi-point transmission system |
| CN102761353A (en) * | 2011-04-27 | 2012-10-31 | 中兴通讯股份有限公司 | Selection method and system of cooperative nodes and paired users |
| CN104038266A (en) * | 2014-06-13 | 2014-09-10 | 清华大学 | Multi-base-station cooperation communication method based on user pairing |
| WO2015161397A1 (en) * | 2014-04-24 | 2015-10-29 | 上海贝尔股份有限公司 | User equipment pairing method and apparatus in multi-user mimo |
| WO2016180187A1 (en) * | 2015-09-01 | 2016-11-17 | 中兴通讯股份有限公司 | Hybrid beam forming uplink multi-user pairing method and apparatus therefor |
| CN106257951A (en) * | 2015-06-19 | 2016-12-28 | 中兴通讯股份有限公司 | A kind of data transmission method and base station |
| CN109921835A (en) * | 2017-12-12 | 2019-06-21 | 华为技术有限公司 | A kind of user's matching method and access point |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647765A (en) * | 2011-04-21 | 2012-08-22 | 北京邮电大学 | Switching method for transmission mode of coordinated multi-point transmission system |
| CN102647765B (en) * | 2011-04-21 | 2014-07-09 | 北京邮电大学 | Switching method for transmission mode of coordinated multi-point transmission system |
| CN102761353A (en) * | 2011-04-27 | 2012-10-31 | 中兴通讯股份有限公司 | Selection method and system of cooperative nodes and paired users |
| CN102761353B (en) * | 2011-04-27 | 2017-09-26 | 中兴通讯股份有限公司 | The system of selection of a kind of cooperative node and pairing user and system |
| WO2015161397A1 (en) * | 2014-04-24 | 2015-10-29 | 上海贝尔股份有限公司 | User equipment pairing method and apparatus in multi-user mimo |
| CN104038266A (en) * | 2014-06-13 | 2014-09-10 | 清华大学 | Multi-base-station cooperation communication method based on user pairing |
| CN106257951A (en) * | 2015-06-19 | 2016-12-28 | 中兴通讯股份有限公司 | A kind of data transmission method and base station |
| CN106257951B (en) * | 2015-06-19 | 2021-04-30 | 中兴通讯股份有限公司 | Data transmission method and base station |
| WO2016180187A1 (en) * | 2015-09-01 | 2016-11-17 | 中兴通讯股份有限公司 | Hybrid beam forming uplink multi-user pairing method and apparatus therefor |
| CN109921835A (en) * | 2017-12-12 | 2019-06-21 | 华为技术有限公司 | A kind of user's matching method and access point |
| CN109921835B (en) * | 2017-12-12 | 2021-08-03 | 华为技术有限公司 | User pairing method and access point |
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Application publication date: 20110420 |