CN104038266A - Multi-base-station cooperation communication method based on user pairing - Google Patents
Multi-base-station cooperation communication method based on user pairing Download PDFInfo
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Abstract
The invention provides a multi-base-station cooperation communication method based on user pairing and belongs to the technical field of wireless communication. The method includes that base stations obtain channel information between each base station and each user according to uplink pilot signals of the users to the base stations or channel information which is fed back to the base stations by the users; the base stations perform pairing on base station antennae and user antennae according to the obtained channel information, and an antenna set which performs allied signal processing is determined; the users in each base station set are grouped, and virtual multiple input multiple output (MIMO) is formed to perform information transmission. The communication method is based on multi-base-station cooperation, communication qualities of community edges can be effectively improved, the space freedom degree is improved through introduction of more antennae, flexible antennae configuration is supported, communication combination partition can be adjusted according to different channel conditions, meanwhile, by means of user pairing, a high order MIMO system can be formed with low costs, and communication qualities can be further improved.
Description
Technical field
The invention belongs to wireless communication technology field, relate in particular to the communication means under a kind of multi-base station cooperative based on user's pairing.
Background technology
In the LTE-A of identical networking system, the interference-limited between neighbor cell service quality and the throughput of Cell Edge User.For the availability of frequency spectrum of further raising system, improve service quality and the throughput of Cell Edge User, must adopt correlation technique effectively to reduce the interference of minizone.Coordinate multipoint in wireless communication field (CoMP) transmission technology is the technology that current LTE-A has bright prospects, and it,, on the basis of keeping system high spectrum utilization as far as possible, can avoid or reduce presence of intercell interference effectively.What CoMP model was the most frequently used is based on Base Band Unit, to add the networking model of wireless remote unit (BBU+RRU), be similar to the spaced antenna technology of knowing traditionally, 1 base station connects a plurality of antenna websites by radio frequency optical fiber (RoF), similar 1 the wireless remote unit of antenna website (RRU), and all Base-Band Processing still concentrate on base station, form concentrated Base Band Unit (BBU).
Multiple-input and multiple-output (MIMO) technology is the important transmission technology of future broadband wireless communication systems air interface, by configure a plurality of reception antennas at transmitting terminal and receiving terminal simultaneously, can improve significantly channel capacity.In CoMP system up-link, a kind of special MIMO technology will be adopted, it is up virtual MIMO (VMIMO) technology, user's pairing is an important and unique link in VMIMO system, and two or more single antenna users of base station selection form virtual multiple-input and multiple-output (VMIMO) transmission.Because signal is from different users, through different channels, the degree interfering with each other between user is different, therefore, only have by effective user and match process, could obtain better the multi-user diversity gain of VMIMO system, and the phase mutual interference that makes to match between user is minimum, guarantees reliability and the robustness of the rear transmission of radio links of 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.Conventional user's matching method 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 base station need to be known and allly will be paired user's channel information, and only considered the orthogonality of mimo channel matrix self, consider pairing user signal to noise ratio separately, do not consider owing to disturbing, the network planning is improper or the problem such as certain areas deep fading.
Random pair: pairing user's selection generates at random, this matching method is used 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 channel matrix characteristic, cannot reach maximum channel capacity, cannot obtain multi-user diversity gain.
Determinant pairing: by dispatching algorithm, select any user, calculate the determinant factor after every other user and this user pairing, selection determinant factor maximum, complete 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, and channel capacity is expressed and also do not put in place completely.
Based on signal noise ratio (SNR), match: propose a kind of by user according to its SNR grouping, do not taking the algorithm of corresponding pairing criterion on the same group.Meanwhile, very few for fear of number of users in a certain group, the situation that multi-user diversity gain is on the low side, introduces marginal utility function, and the user who allows part to meet the demands, carries out across assembly pair.
Pairing based on path loss and slow fading sequence: user's path loss is added to slow fading value and sort, user adjacent after sorting is matched.This matching method is simple, complexity is low, moves slowly, path loss and slow fading be slowly in situation user, and user's pair frequency again also can reduce, and due to pairing user path loss, to add slow fading value close, also reduced the possibility of user's generation " distance " effect.Shortcoming is that pairing subscriber channel correlation may be larger, and the interference ratio between pairing user is larger.
Summary of the invention
The object of the invention is for overcoming the weak point of prior art, proposed the communication means under a kind of multi-base station cooperative based on user's pairing, to improve the performance of multi-base station cooperative system, further improve communication quality.
Communication means under a kind of multi-base station cooperative based on user's pairing that the present invention proposes, is characterized in that, described method comprises:
Channel information according to user to the uplink pilot signal of base station or from user to base station feedback, base station obtains the channel information between each base station and each user;
Match to antenna for base station and user antenna according to resulting channel information base station, determines the antenna set of carrying out allied signal processing;
User in each collection of base stations is divided into groups, form virtual MIMO and carry out information transmission.
The concrete steps of said method comprise:
(1) determine base station number, the antenna for base station number of multi-base station cooperative, number of users, user antenna number;
(2) channel information to the uplink pilot signal of base station or user to base station feedback according to user, base station obtains each base station to the channel information between each user;
(3) match to antenna for base station and user antenna according to resulting channel information base station, determines the antenna set of carrying out allied signal processing;
(4) user in each collection of base stations is divided into groups, form virtual multiple-input and multiple-output MIMO and carry out information transmission.
Feature of the present invention and beneficial effect:
In the technical scheme that the present invention proposes, according to the channel information between user and each base station of cooperating, the antenna of user and many base stations is carried out to packet transaction, determine and carry out the antenna set of allied signal processing and the user who serves thereof; User in each antenna set is carried out to user's pairing, form virtual MIMO and carry out the transmission of information.The present invention is based on multi-base station cooperative, can effectively improve the communication quality of cell edge, and improve spatial degrees of freedom by introducing more antennas, support antenna configuration flexibly, can, according to the division of different channel condition adjustment communication combinations,, by user, match meanwhile, make system to form high level MIMO system with less expense, further improve communication quality.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the communication means under the multi-base station cooperative based on user pairing that proposes of the present invention.
Fig. 2 is the communication scenes schematic diagram of the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.
Communication means under a kind of multi-base station cooperative based on user's pairing that the present invention proposes, is characterized in that, described method comprises:
Channel information according to user to the uplink pilot signal of base station or from user to base station feedback, base station obtains the channel information between each base station and each user;
Match to antenna for base station and user antenna according to resulting channel information base station, determines the antenna set of carrying out allied signal processing;
User in each collection of base stations is divided into groups, form virtual MIMO and carry out information transmission.
The concrete steps of said method as shown in Figure 1, comprising:
(1) determine base station number, the antenna for base station number of multi-base station cooperative, number of users, user antenna number;
(2) channel information to the uplink pilot signal of base station or user to base station feedback according to user, base station obtains each base station to the channel information between each user;
(3) match to antenna for base station and user antenna according to resulting channel information base station, determines the antenna set of carrying out allied signal processing;
(4) user in each collection of base stations is divided into groups, form virtual multiple-input and multiple-output MIMO and carry out information transmission.
Base station obtains each base station and to the concrete mode of the channel information between each user is in described step (2):
Utilize user to carry out channel estimating to the uplink pilot signal of base station, base station obtains each base station to the channel information between each user; Or according to user the channel information to base station feedback, base station obtains each base station to the channel information between each user.
The method that match to antenna for base station and user antenna according to resulting channel information described step (3) base station specifically comprises:
Dividing into groups antenna for base station according to virtual multiple-input and multiple-output (VMIMO) antenna configuration and the user side antenna number stipulated in communication protocol in base station, forms the antenna set that several carry out allied signal processing each other; Base station matches each user and antenna for base station set according to channel information; Concrete steps are as follows:
A, establish considered communication system by M co-operating base station and N user, M, N are positive integer; Wherein, N user's set is { UE
1, UE
2..., UE
n, each user has L root antenna, and all users' antenna set is { AUE
1, AUE
2..., AUE
n * L, wherein subscript represents 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 all antenna for base station set are:
{ ABS
1, ABS
2..., ABS
m * K, wherein subscript represents antenna for base station numbering;
Channel information between b, note base station and each user is { Hi
j, Hi wherein
jrepresent that i user is to the channel information of j base station; According to channel information { Hi
j, match to antenna for base station and user antenna base station:
B1, according to virtual multiple-input and multiple-output MIMO antenna configuration and the user side number of antennas stipulated in communication protocol, the every a of a base station sets user and Q
jfoundation station antenna forms one group of virtual MIMO, divides antenna for base station be divided into S group by this, and the link number of every group of virtual MIMO is (a * L) * Q
j, Q wherein
jbe the number of antennas of base station end in j group virtual MIMO, meet Q
j>=a * L, the number of users corresponding with every group of antenna for base station is
The antenna set of carrying out allied signal processing between b2, base station sets base station is:
wherein subscript represents the antenna label in antenna set label and antenna set, has altogether S antenna set, 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 i the antenna set numbering that user is corresponding, according to channel information { Hi
jeach user and antenna for base station set are matched;
C, the user in each collection of base stations is divided into groups: according to the pairing result { a|Index of s collection of base stations in the user of step b and S antenna for base station set
l=s}, a the user to antenna for base station set s pairing, according to channel information { Hi
jcarry out user grouping.
D, transmission of information mode be, travels through the user in each user's group, carries out the communication that each user organizes virtual MIMO.
Embodiment: the communication scenes schematic diagram of the present embodiment as shown in Figure 2.The present embodiment is with two base stations (every base station two antennas), four users (every user's single antenna), and the virtual MIMO that one group of every two user and antenna for base station composition are two 2 * 2 is example
The concrete steps that the present embodiment is carried multi-user's matching method are as follows:
(1) four user's set is { UE
1, UE
2, UE
3, UE
4, antenna of each user, the antenna set of user side is { AUE
1, AUE
2, AUE
3, AUE
4, subscript represents user antenna numbering; The set of two base stations is { BS
1, BS
2, two of each base stations antenna, the set of many antenna for base station is { ABS
1, ABS
2, ABS
3, ABS
4, subscript represents antenna for base station numbering;
(2) channel information to the uplink pilot signal of base station or user to base station feedback according to user, base station obtains the channel information between each user.The present embodiment is chosen channel fading coefficient as required channel information, obtains
H wherein
ijrepresent that i user is to the channel fading coefficient of j antenna for base station.
(3) according to above-mentioned channel information { Hi
j, it is as follows that detailed process is matched to antenna for base station and user antenna in base station:
(3-1) according to virtual multiple-input and multiple-output MIMO antenna configuration and the user side number of antennas stipulated in communication protocol, every two users of base station sets and two foundation station antennas form one group of virtual MIMO, by this, divide antenna for base station and be divided into two groups, the number of antennas of every group of virtual MIMO is 2 * 2, so setting parameter a=2, Q
j=2, S=2;
(3-2) the antenna set of carrying out allied signal processing between base station sets base station is:
{ { ABS
1,1, ABS
1,2, { ABS
2,1, ABS
2,2, wherein subscript represents the antenna label in antenna set label and antenna set, has altogether two antenna set, 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
i≤ 2 represent the antenna set numbering that i user served.According to channel information { Hi
jeach user and antenna for base station set are matched.The present embodiment be take determinant criterion as example, supposes to adopt frequency division/time division way to carry out the information transmission between group multiplexing, by selecting
carry out user's pairing, wherein H
ij, mnby the capable j of i of H, capable and m is listed as the second order principal minor that n row form: m ≠ n ≠ o ≠ p in expression;
(4) according to the pairing result { a|Index of the user of step (3) and antenna for base station set s
l=s}, divides into groups to a user in antenna for base station set s, forms virtual MIMO and carries out information transmission, and detailed process is as follows:
(4-1) to the user with antenna for base station set s pairing, according to channel information { Hi
jcarry out user grouping, and take equally determinant criterion as example, the criterion of carrying out user grouping in this set is:
be divided into
individual user's group.
(4-2) travel through the user in each user's group, carry out the communication that each user organizes virtual MIMO.
Claims (5)
1. the communication means under the multi-base station cooperative based on user's pairing, is characterized in that, described method comprises:
Channel information according to user to the uplink pilot signal of base station or from user to base station feedback, base station obtains the channel information between each base station and each user;
Match to antenna for base station and user antenna according to resulting channel information base station, determines the antenna set of carrying out allied signal processing;
User in each collection of base stations is divided into groups, form virtual MIMO and carry out information transmission.
2. method according to claim 1, is characterized in that, described method specifically comprises the following steps:
(1) determine base station number, the antenna for base station number of multi-base station cooperative, number of users, user antenna number;
(2) channel information to the uplink pilot signal of base station or user to base station feedback according to user, base station obtains each base station to the channel information between each user;
(3) match to antenna for base station and user antenna according to resulting channel information base station, determines the antenna set of carrying out allied signal processing;
(4) user in each collection of base stations is divided into groups, form virtual multiple-input and multiple-output MIMO and carry out information transmission.
3. method as claimed in claim 2, is characterized in that, in described step (2), base station obtains each base station and to the concrete mode of the channel information between each user is:
Utilize user to carry out channel estimating to the uplink pilot signal of base station, base station obtains each base station to the channel information between each user; Or according to user the channel information to base station feedback, base station obtains each base station to the channel information between each user.
4. method as claimed in claim 2, is characterized in that, the method that match to antenna for base station and user antenna according to resulting channel information described step (3) base station specifically comprises:
A, establish considered communication system by M co-operating base station and N user, M, N are positive integer; Wherein, N user's set is { UE
1, UE
2..., UE
n, each user has L root antenna, and all users' antenna set is { AUE
1, AUE
2..., AUE
n * L, wherein subscript represents 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 all antenna for base station set are:
{ ABS
1, ABS
2..., ABS
m * K, wherein subscript represents antenna for base station numbering;
Channel information between b, note base station and each user is { Hi
j, Hi wherein
jrepresent that i user is to the channel information of j base station; According to channel information { Hi
j, match to antenna for base station and user antenna base station:
C, the user in each collection of base stations is divided into groups: according to the pairing result { a|Index of s collection of base stations in the user of step b and S antenna for base station set
l=s}, a the user to antenna for base station set s pairing, according to channel information { Hi
jcarry out user grouping.
D, transmission of information mode be, travels through the user in each user's group, carries out the communication that each user organizes virtual MIMO.
5. method as claimed in claim 4, is characterized in that, described step b specifically comprises:
B1, according to virtual multiple-input and multiple-output MIMO antenna configuration and the user side number of antennas stipulated in communication protocol, the every a of a base station sets user and Q
jfoundation station antenna forms one group of virtual MIMO, divides antenna for base station be divided into S group by this, and the link number of every group of virtual MIMO is (a * L) * Q
j, Q wherein
jbe the number of antennas of base station end in j group virtual MIMO, meet Q
j>=a * L, the number of users corresponding with every group of antenna for base station is
The antenna set of carrying out allied signal processing between b2, base station sets base station is:
wherein subscript represents the antenna label in antenna set label and antenna set, has altogether S antenna set, and the setting antenna for base station set corresponding with each user is numbered { Index
1, Indes
2..., Index
n, 1≤Index wherein
i≤ S represents to i the antenna set numbering that user is corresponding, according to channel information { Hi
jeach user and antenna for base station set are matched.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991168A (en) * | 2015-01-30 | 2016-10-05 | 中国移动通信集团公司 | Antenna selection method and antenna selection device |
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| CN101834702A (en) * | 2009-03-12 | 2010-09-15 | 夏普株式会社 | Channel reconstruction method, base station and user equipment |
| CN102025465A (en) * | 2010-12-24 | 2011-04-20 | 清华大学 | Communication method under cooperation of multiple base stations based on user pairing |
| CN103078714A (en) * | 2013-01-28 | 2013-05-01 | 复旦大学 | Downlink collaboration multipoint transmission method based on collaboration decision and adaptive power distribution |
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2014
- 2014-06-13 CN CN201410266052.3A patent/CN104038266A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834702A (en) * | 2009-03-12 | 2010-09-15 | 夏普株式会社 | Channel reconstruction method, base station and user equipment |
| CN102025465A (en) * | 2010-12-24 | 2011-04-20 | 清华大学 | Communication method under cooperation of multiple base stations based on user pairing |
| CN103078714A (en) * | 2013-01-28 | 2013-05-01 | 复旦大学 | Downlink collaboration multipoint transmission method based on collaboration decision and adaptive power distribution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105991168A (en) * | 2015-01-30 | 2016-10-05 | 中国移动通信集团公司 | Antenna selection method and antenna selection device |
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