CN102045778A - Multiple base station adaptive cooperative transmission method based on QoS - Google Patents

Multiple base station adaptive cooperative transmission method based on QoS Download PDF

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CN102045778A
CN102045778A CN2011100309079A CN201110030907A CN102045778A CN 102045778 A CN102045778 A CN 102045778A CN 2011100309079 A CN2011100309079 A CN 2011100309079A CN 201110030907 A CN201110030907 A CN 201110030907A CN 102045778 A CN102045778 A CN 102045778A
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signal
base station
user terminal
noise ratio
plus noise
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康桂华
张鹏
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Changzhou Campus of Hohai University
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Changzhou Campus of Hohai University
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Abstract

A multiple base station adaptive cooperative transmission method based on QoS, comprising the following steps: A, a user terminal periodically monitors a signal-to-noise ratio SINR of a received service signal, wherein the received service signal comes from each serving base station; B, when the SINR of the service signal received by a receiving end of the user terminal cannot meet requirements on the service QoS, the user terminal makes a cooperation request to the serving base station through a own emitting end; C, the serving base station selects a cooperation mode, and transmits cooperation indication to a cooperative base station; and D, the cooperative base station transmits the service signal to the user terminal with the serving base station according to the received cooperation indication. The multiple base station adaptive cooperative transmission method based on QoS can greatly eliminate or reduce cell interference, simultaneously, also can effectively reduce feedback cost generated by multiple base station cooperation, and improve integral performance of the system, so that the method is a simple and practical method for solving a service problem of correctly and effectively transmitting various QoS demands.

Description

A kind of many base stations adaptive cooperation transmission method based on QoS
Technical field
The invention belongs to the wireless mobile telecommunication technology field, relate in particular to multi-base station cooperative communication situation in the cellular mobile network.Be applied in the mobile radio networks, can satisfy the qos requirement of user's different business.
Background technology
In cellular mobile communication networks, in order to guarantee spectrum efficiency, the identical networking pattern is often adopted in the minizone, and this causes presence of intercell interference to strengthen greatly, the performance rapid deterioration of Cell Edge User, and the capacity of network and throughput are subjected to very big restriction.Based on the user fairness principle, the method of various inhibition presence of intercell interference is suggested and uses, as be applied in IDMA technology among the LTE, FFR technology etc., but its obtained performance improvement is often by improving system complexity or sacrificing that spectrum efficiency brings, against the original intention of system design.
Multi-base station cooperative technological break-through the constraint of single base station coordinates interference principle among the legacy cellular mobile network, introduce the thought that joint coordination disturbs, by the effective cooperation between the base station, can be one or more users and transmit information simultaneously, the interference of minizone be can reduce effectively, power system capacity and spectrum efficiency improved.But the huge cooperation feedback overhead that produces in the cooperating process also becomes the principal element that the restriction cooperative gain further improves.
On the other hand, following wireless communication system will be faced with the transformation task of bearing multiple new business, as multimedia service, mobile message business, Internet access service etc., exist very big difference between the qos requirement of these different business, how correctly and effectively to transmit the business datum of various qos requirements, become a problem demanding prompt solution.
In wireless communications environment, exist important dependence between the QoS of miscellaneous service and the Signal to Interference plus Noise Ratio of received signal.For existing cellular mobile network, presence of intercell interference is big, therefore concerning the cellular mobile network in future, eliminating or reduce presence of intercell interference will be Signal to Interference plus Noise Ratio and the sub-district overall performance that promotes received signal, a kind of important means that satisfies various qos requirements.Meanwhile, under the low-power situation, the demand of transmitting data fast and effectively also shows more and more urgently at present.
Summary of the invention
The purpose of this invention is to provide a kind of many base stations adaptive cooperation transmission method based on QoS, presence of intercell interference can greatly be eliminated or reduce to this method, can also reduce simultaneously the feedback overhead that multi-base station cooperative produces effectively, the overall performance of elevator system is a kind of simple and practical method that solves the traffic issues of correctly and effectively transmitting various qos requirements.
The present invention realizes that the technical scheme of above-mentioned purpose is, a kind of many base stations adaptive cooperation transmission data method based on QoS, and its innovative point is: this method may further comprise the steps:
A, user terminal are periodically monitored the Signal to Interference plus Noise Ratio of the service signal that receives, and the described service signal that receives is from each serving BS;
When the Signal to Interference plus Noise Ratio of B, the service signal that receives when the receiving terminal of user terminal can not satisfy this QoS of survice demand, user terminal proposed the cooperation request by the transmitting terminal of self to serving BS;
C, serving BS are selected collaboration mode, and send the cooperation indication to cooperative base station;
D, cooperative base station send service signal with serving BS for user terminal according to the cooperation indication that receives.
In steps A, for
Figure 2011100309079100002DEST_PATH_IMAGE001
The service signal that individual base station, user terminal receive can be expressed as:
Figure 280841DEST_PATH_IMAGE002
Wherein,
Figure 2011100309079100002DEST_PATH_IMAGE003
The expression base station To the channel matrix between user terminal, dimension is
Figure 478473DEST_PATH_IMAGE006
,
Figure 2011100309079100002DEST_PATH_IMAGE007
, Represent the number of antennas of the receiving terminal and the transmitting terminal of channel respectively, under TDD mode, utilize the reciprocity of channel, estimate by the detection reference signal of up channel
Figure 916462DEST_PATH_IMAGE003
Value, under mode of frequency division duplexing, the feedback by user terminal obtains
Figure 752700DEST_PATH_IMAGE003
Value;
Figure 2011100309079100002DEST_PATH_IMAGE009
For
Figure 195052DEST_PATH_IMAGE010
The dimension pre-coding matrix, wherein
Figure 2011100309079100002DEST_PATH_IMAGE011
Be the number of plies,
Figure 396226DEST_PATH_IMAGE009
By
Figure 838708DEST_PATH_IMAGE012
Singular value decomposition obtain;
Figure 2011100309079100002DEST_PATH_IMAGE013
Be the base station
Figure 603271DEST_PATH_IMAGE005
Transmitting power;
Figure 713178DEST_PATH_IMAGE014
Be the base station
Figure 147571DEST_PATH_IMAGE005
Figure 2011100309079100002DEST_PATH_IMAGE015
The data that the moment sends;
Figure 264300DEST_PATH_IMAGE016
For user terminal exists
Figure 442341DEST_PATH_IMAGE015
The additive white Gaussian noise that constantly receives;
Be serving BS
Figure 344438DEST_PATH_IMAGE018
The useful signal that transmits;
Figure 2011100309079100002DEST_PATH_IMAGE019
For removing the service base station
Figure 74365DEST_PATH_IMAGE018
Outside the interference signal of other base station;
Therefore, the Signal to Interference plus Noise Ratio of user terminal calculates by following formula:
Figure 757019DEST_PATH_IMAGE020
，
Wherein i represents i base station.
In described step B, user terminal presets and satisfies the pairing Signal to Interference plus Noise Ratio threshold value tabulation of different business QoS demand, the Signal to Interference plus Noise Ratio of periodically monitoring the service signal that receives is compared with the Signal to Interference plus Noise Ratio threshold value tabulation of presetting, determine whether to need to propose the cooperation request.
It is to preset by the type of service classification at user terminal before transfer of data that described user terminal presets the Signal to Interference plus Noise Ratio threshold value tabulation of satisfying different business QoS demand.
The Signal to Interference plus Noise Ratio that described user terminal will periodically be monitored the service signal that receives with the step that the Signal to Interference plus Noise Ratio threshold value tabulation of presetting compares is, user terminal periodically calculates the Signal to Interference plus Noise Ratio of received signal, and from received signal, parse the type of service of this signal, select the Signal to Interference plus Noise Ratio threshold value of the corresponding business of institute to compare in the Signal to Interference plus Noise Ratio threshold value that from user terminal, the presets tabulation.
Described user terminal determines whether that the step that needs to propose the cooperation request is, when the Signal to Interference plus Noise Ratio of the service signal that receives when user terminal is detected is less than or equal to the Signal to Interference plus Noise Ratio threshold value of the corresponding business of institute in the Signal to Interference plus Noise Ratio threshold value tabulation of presetting, then need cooperation, send the cooperation request, otherwise user terminal does not send the cooperation request, continues the Signal to Interference plus Noise Ratio of monitoring received signal.
In step C, described collaboration mode comprises partial cooperative pattern and full collaboration mode.
For described partial cooperative pattern, select the pre-coding matrix of serving BS and cooperative base station should follow following criterion:
Figure 2011100309079100002DEST_PATH_IMAGE021
，
Wherein i represents i serving BS, and j represents j cooperative base station,
Figure 660122DEST_PATH_IMAGE022
Be the code book set.
For described full collaboration mode, then select the pre-coding matrix of serving BS and cooperative base station should follow following criterion:
Figure 2011100309079100002DEST_PATH_IMAGE023
，
Wherein i represents i serving BS, and j represents j cooperative base station, Be the code book set.
Described serving BS and cooperative base station refer to the base station that the geographical position is adjacent.
The present invention presets the tabulation of Signal to Interference plus Noise Ratio threshold value at the user terminal place, serving BS is according to the user's
Figure 481937DEST_PATH_IMAGE024
Requirement, partial cooperative with entirely cooperate between carry out Dynamic Selection, method is simple, can greatly eliminate or reduce presence of intercell interference, can also reduce the feedback overhead that multi-base station cooperative produces simultaneously effectively, reach the purpose of correctly transmitting the business datum of various qos requirements effectively, and less to the existing network infrastructure change, good with LTE R8 capacitive, also can be applicable to LTE-A or IEEE 802.16m system, applied range, practical.
Description of drawings
Fig. 1 is two base station collaboration transaction module figure;
Fig. 2 is up multi-base station cooperative process chart;
Fig. 3 is multi-base station cooperative transfer process figure among the present invention;
Fig. 4 is the performance comparison figure of the present invention and other transmission plans.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail.
A kind of many base stations adaptive cooperation transmission data method based on QoS, this method may further comprise the steps:
A, user terminal are periodically monitored the Signal to Interference plus Noise Ratio SINR of the service signal that receives, and the described service signal that receives is from each serving BS;
When the Signal to Interference plus Noise Ratio SINR of B, the service signal that receives when the receiving terminal of user terminal can not satisfy this QoS of survice demand, user terminal proposed the cooperation request by the transmitting terminal of self to serving BS;
C, serving BS are selected collaboration mode, and send the cooperation indication to cooperative base station;
D, cooperative base station send service signal with serving BS for user terminal according to the cooperation indication that receives.
In steps A, for
Figure 386308DEST_PATH_IMAGE001
The service signal that individual base station, user terminal receive can be expressed as:
Figure 906151DEST_PATH_IMAGE002
Wherein,
Figure 845157DEST_PATH_IMAGE003
The expression base station
Figure 854570DEST_PATH_IMAGE005
To the channel matrix between user terminal, dimension is
Figure 246237DEST_PATH_IMAGE006
,
Figure 2011100309079100002DEST_PATH_IMAGE025
,
Figure 694405DEST_PATH_IMAGE008
Represent the number of antennas of the receiving terminal and the transmitting terminal of channel respectively, under TDD mode, utilize the reciprocity of channel, estimate by the detection reference signal of up channel
Figure 300967DEST_PATH_IMAGE003
Value, under mode of frequency division duplexing, the feedback by user terminal obtains Value;
Figure 297928DEST_PATH_IMAGE009
For
Figure 425153DEST_PATH_IMAGE010
The dimension pre-coding matrix, wherein
Figure 73172DEST_PATH_IMAGE011
Be the number of plies, By
Figure 728330DEST_PATH_IMAGE012
Singular value decomposition
Figure 393666DEST_PATH_IMAGE026
Obtain;
Figure 958509DEST_PATH_IMAGE013
Be the base station Transmitting power;
Be the base station
Figure 740892DEST_PATH_IMAGE005
Figure 97924DEST_PATH_IMAGE015
The data that the moment sends;
Figure 994204DEST_PATH_IMAGE016
For user terminal exists
Figure 69477DEST_PATH_IMAGE015
The additive white Gaussian noise that constantly receives;
Figure 76616DEST_PATH_IMAGE017
Be serving BS
Figure 553734DEST_PATH_IMAGE018
The useful signal that transmits;
Figure 620916DEST_PATH_IMAGE019
For removing the service base station
Figure 183484DEST_PATH_IMAGE018
Outside the interference signal of other base station;
Therefore, the Signal to Interference plus Noise Ratio SINR of user terminal calculates by following formula:
Figure 994314DEST_PATH_IMAGE020
，
Wherein i represents i base station.
In described step B, user terminal presets and satisfies the pairing Signal to Interference plus Noise Ratio threshold value tabulation of different business QoS demand, the Signal to Interference plus Noise Ratio SINR that periodically monitors the service signal that receives is compared with the Signal to Interference plus Noise Ratio threshold value tabulation of presetting, determine whether to need to propose the cooperation request.The relevant information that user terminal sends to serving BS comprise user terminal (
Figure 2011100309079100002DEST_PATH_IMAGE027
) calculate channel condition information (
Figure 450572DEST_PATH_IMAGE028
), pre-coding matrix indication (
Figure 2011100309079100002DEST_PATH_IMAGE029
) and the order information of channel matrix etc.
It is to preset by the type of service classification at user terminal before transfer of data that described user terminal presets the Signal to Interference plus Noise Ratio threshold value tabulation of satisfying different business QoS demand.
The Signal to Interference plus Noise Ratio SINR that described user terminal will periodically be monitored the service signal that receives with the step that the Signal to Interference plus Noise Ratio threshold value tabulation of presetting compares is, user terminal periodically calculates the Signal to Interference plus Noise Ratio SINR of received signal, and from received signal, parse the type of service of this signal, select the Signal to Interference plus Noise Ratio threshold value of the corresponding business of institute to compare in the Signal to Interference plus Noise Ratio threshold value that from user terminal, the presets tabulation.Modulation system during the transmission of the Signal to Interference plus Noise Ratio threshold value that presets and signal and professional required minimum
Figure 626338DEST_PATH_IMAGE024
Requirements etc. are relevant, and increase with the raising of order of modulation.
Described user terminal determines whether that the step that needs to propose the cooperation request is, when the Signal to Interference plus Noise Ratio SINR of the service signal that receives when user terminal is detected is less than or equal to the Signal to Interference plus Noise Ratio threshold value of the corresponding business of institute in the Signal to Interference plus Noise Ratio threshold value tabulation of presetting, then need cooperation, send the cooperation request, otherwise user terminal does not send the cooperation request, continues the Signal to Interference plus Noise Ratio SINR of monitor signal.
In step C, described collaboration mode comprises partial cooperative pattern and full collaboration mode.Partial cooperative refers to only exchange between the base station
Figure 676203DEST_PATH_IMAGE030
Information and relevant control information; Full cooperation refers to share each other between the base station
Figure 25145DEST_PATH_IMAGE030
Information, control information and data message, data are transmitted for one or more users jointly in a plurality of base stations; Wherein, the indication information that sends to cooperative base station of serving BS comprises collaboration mode and relevant
Figure 687243DEST_PATH_IMAGE030
Information etc.
For described partial cooperative pattern, select the pre-coding matrix of serving BS and cooperative base station should follow following criterion:
Figure 830648DEST_PATH_IMAGE021
，
Wherein i represents i serving BS, and j represents j cooperative base station,
Figure 367809DEST_PATH_IMAGE022
Be the code book set.
For described full collaboration mode, then select the pre-coding matrix of serving BS and cooperative base station should follow following criterion:
，
Wherein i represents i serving BS, and j represents j cooperative base station,
Figure 764341DEST_PATH_IMAGE022
Be the code book set.
Described serving BS and cooperative base station are meant the base station that the geographical position is adjacent.
In step D, cooperative base station is one or more user terminal transmission data in identical time according to the indication of serving BS;
Wherein, the data content that cooperative base station sends relies on serving BS to distribute, and serving BS carries out flexible dispatching according to the feedback information of user terminal;
Wherein, the data of cooperative base station transmission can be the data identical with serving BS, thereby produce diversity gain; Also can be different data, at this moment can produce multiplexed gain.
It is 1 radio communication scene that the present invention is applied to frequency duplex factor as one, is that user's service is embodiment with two base station collaborations only, can be generalized to the multi-base station cooperative model at an easy rate.
As shown in Figure 1, user terminal
Figure 2011100309079100002DEST_PATH_IMAGE031
Be positioned at the base station
Figure 531177DEST_PATH_IMAGE032
,
Figure 2011100309079100002DEST_PATH_IMAGE033
The overlay area in, two base stations can be simultaneously to
Figure 414689DEST_PATH_IMAGE031
The transmission data. ,
Figure 2011100309079100002DEST_PATH_IMAGE035
Be respectively
Figure 469418DEST_PATH_IMAGE032
,
Figure 220205DEST_PATH_IMAGE033
Arrive
Figure 466379DEST_PATH_IMAGE031
Channel matrix,
Figure 960814DEST_PATH_IMAGE036
,
Figure 2011100309079100002DEST_PATH_IMAGE037
Be respectively the data message of two base station transmitting terminals.
In this system,
Figure 366257DEST_PATH_IMAGE015
Constantly
Figure 350262DEST_PATH_IMAGE031
The signal that receives is
Figure 83732DEST_PATH_IMAGE038
Wherein
Figure 2011100309079100002DEST_PATH_IMAGE039
,
Figure 240912DEST_PATH_IMAGE040
Be respectively What receive comes from the base station
Figure 468817DEST_PATH_IMAGE032
,
Figure 689583DEST_PATH_IMAGE033
Signal,
Figure 525821DEST_PATH_IMAGE016
Be white Gaussian noise.
Fig. 2 shows up multi-base station cooperative handling process, the zero hour
Figure 515643DEST_PATH_IMAGE027
The feedback information that produces comprises
Figure 2011100309079100002DEST_PATH_IMAGE041
,
Figure 716817DEST_PATH_IMAGE029
And (steps 201) such as order information of channel matrix; Initial condition only sends feedback information to serving BS (step 202); Serving BS is adjusted feedback information according to feedback information in conjunction with the state of base station end, calculates and select new precoding vector (step 203,205).
When single base station transmits can not satisfy systematic function and requires, serving BS can be asked adjacent base station collaboration, by between the base station
Figure 424879DEST_PATH_IMAGE042
The interface exchange
Figure 64807DEST_PATH_IMAGE041
, the sub-district
Figure 2011100309079100002DEST_PATH_IMAGE043
Etc. information (step 207), after the cooperation request is got permission,
Figure 33769DEST_PATH_IMAGE027
Just send feedback information to cooperative base station, cooperative base station is finished successively and is adjusted feedback information and select precoding vector process (step 204,206).
Fig. 3 shows the flow process of multi-base station cooperative transmission of the present invention.The zero hour
Figure 530479DEST_PATH_IMAGE027
Be in the state of cooperation, monitoring transport service type and calculating reception data
Figure 749274DEST_PATH_IMAGE044
(step 301); Search the pairing threshold value of this business
Figure 2011100309079100002DEST_PATH_IMAGE045
And compare with it, when
Figure 51948DEST_PATH_IMAGE027
Received signal
Figure 16362DEST_PATH_IMAGE046
The time (step 302),
Figure 621656DEST_PATH_IMAGE027
Send cooperation request (step 304) to serving BS, otherwise continue monitoring (step 303); When
Figure 117359DEST_PATH_IMAGE027
When first request was cooperated, system adopted partial cooperative pattern (step 304).
Described partial cooperative is meant only exchange between the base station
Figure 833511DEST_PATH_IMAGE041
Information and relevant control information.The serving BS basis
Figure 652432DEST_PATH_IMAGE027
The cooperation request, relevant information and instruction are passed through
Figure 694206DEST_PATH_IMAGE042
Interface is transferred to cooperative base station, and serving BS with cooperative base station on identical time is
Figure 598577DEST_PATH_IMAGE027
Service.
In conjunction with the embodiments, following criterion is followed in the selection of base station pre-coding matrix respectively
Figure 2011100309079100002DEST_PATH_IMAGE047
Wherein,
Figure 243054DEST_PATH_IMAGE048
,
Figure 2011100309079100002DEST_PATH_IMAGE049
Represent respectively when it is minimum and maximum making the bracket intermediate value
Figure 306693DEST_PATH_IMAGE009
Value,
Figure 253790DEST_PATH_IMAGE050
For 2 norms of matrix square,
Figure 645457DEST_PATH_IMAGE022
Be the code book set.
At this moment Upper and lower boundary satisfies following inequality:
Figure 2011100309079100002DEST_PATH_IMAGE051
Continuation monitoring transport service type and calculating receive data
Figure 67452DEST_PATH_IMAGE044
(step 306), and with corresponding
Figure 946415DEST_PATH_IMAGE045
Make comparisons, when
Figure 808060DEST_PATH_IMAGE027
Received signal
Figure 456079DEST_PATH_IMAGE052
Still do not reach the user
Figure 10558DEST_PATH_IMAGE024
Require
Figure 376817DEST_PATH_IMAGE045
The time (step 307),
Figure 776574DEST_PATH_IMAGE027
Just send cooperation request (step 309) for the second time to serving BS, otherwise continue monitoring (step 308), serving BS sends full cooperation indication (step 310) in conjunction with the partial cooperative information first time to cooperative base station.
Described full cooperation is meant that serving BS exchanges to cooperative base station Information, control information and data message.Information is shared fully between serving BS and cooperative base station, and serving BS with cooperative base station on identical time is jointly
Figure 4479DEST_PATH_IMAGE027
Service.
In conjunction with the embodiments, following criterion is followed in the selection of base station pre-coding matrix respectively
Figure 2011100309079100002DEST_PATH_IMAGE053
At this moment
Figure 795718DEST_PATH_IMAGE027
Figure 999166DEST_PATH_IMAGE044
For:
Figure 621777DEST_PATH_IMAGE054
Wherein,
Figure 518058DEST_PATH_IMAGE036
,
Figure 655647DEST_PATH_IMAGE037
Can be the different data messages or the different copies of identical data message.This shows, in the partial cooperative stage, user's received signal Improve, and the stage of cooperating entirely, the interfere information of adjacent base station has become Useful information,
Figure 543023DEST_PATH_IMAGE027
Received signal Improved further.
Below to different business
Figure 650842DEST_PATH_IMAGE045
Describe.
Different business
Figure 248046DEST_PATH_IMAGE045
Selection, with the user to this business
Figure 299178DEST_PATH_IMAGE024
Requirement relevant.Below with the error rate of system (
Figure 2011100309079100002DEST_PATH_IMAGE055
) index is that example illustrates, because different communication system in the practical application, for different business
Figure 473677DEST_PATH_IMAGE055
Require also to be not quite similar.With the 3-G (Generation Three mobile communication system) is example, for mobile voice and video image business, requires wireless access system
Figure 9569DEST_PATH_IMAGE056
For data service, requirement
Especially, if use
Figure 320334DEST_PATH_IMAGE058
The data-modulated mode,
Figure 2011100309079100002DEST_PATH_IMAGE059
Under the channel, minimum when business regulation Requirement is
Figure 204162DEST_PATH_IMAGE060
The time, required is minimum
Figure 356795DEST_PATH_IMAGE044
Requirement can be expressed as
With
Figure 849962DEST_PATH_IMAGE062
Be example, when the data service requirement of transmission
Figure 164268DEST_PATH_IMAGE057
The time, be not difficult to calculate
Figure 2011100309079100002DEST_PATH_IMAGE063
Fig. 4 shows the present invention program and the service of single sub-district, partial cooperative, the full contrast of collaboration mode aspect data transmission rate, and the performance curve that provides from Fig. 4 can find out, when
Figure 313359DEST_PATH_IMAGE044
Value less than
Figure 817153DEST_PATH_IMAGE064
The time, system has experienced partial cooperative, two different phases of cooperating entirely.When
Figure 243455DEST_PATH_IMAGE044
Value greater than
Figure 728663DEST_PATH_IMAGE064
The time, single sub-district service mode of getting back to non-cooperation again.This shows that transmission plan that the present invention proposes can automatically adapt to the user to different business
Figure 240415DEST_PATH_IMAGE024
Requirement.

Claims (10)

1. the many base stations adaptive cooperation based on QoS transmits data method, and it is characterized in that: this method may further comprise the steps:
A, user terminal are periodically monitored the Signal to Interference plus Noise Ratio (SINR) of the service signal that receives, and the described service signal that receives is from each serving BS;
When the Signal to Interference plus Noise Ratio (SINR) of B, the service signal that receives when the receiving terminal of user terminal can not satisfy this QoS of survice demand, user terminal proposed the cooperation request by the transmitting terminal of self to serving BS;
C, serving BS are selected collaboration mode, and send the cooperation indication to cooperative base station;
D, cooperative base station send service signal with serving BS for user terminal according to the cooperation indication that receives.
2. the many base stations adaptive cooperation transmission data method based on QoS according to claim 1 is characterized in that: in steps A, for
Figure 2011100309079100001DEST_PATH_IMAGE001
The service signal that individual base station, user terminal receive can be expressed as:
Figure 244513DEST_PATH_IMAGE002
Wherein,
Figure 2011100309079100001DEST_PATH_IMAGE003
The expression base station
Figure 2011100309079100001DEST_PATH_IMAGE005
To the channel matrix between user terminal, dimension is
Figure 611778DEST_PATH_IMAGE006
, ,
Figure 428425DEST_PATH_IMAGE008
Represent the number of antennas of the receiving terminal and the transmitting terminal of channel respectively, under TDD mode, utilize the reciprocity of channel, estimate by the detection reference signal of up channel
Figure 290070DEST_PATH_IMAGE003
Value, under mode of frequency division duplexing, the feedback by user terminal obtains
Figure 406DEST_PATH_IMAGE003
Value;
Figure 2011100309079100001DEST_PATH_IMAGE009
For
Figure 679518DEST_PATH_IMAGE010
The dimension pre-coding matrix, wherein Be the number of plies, By Singular value decomposition (
Figure 2011100309079100001DEST_PATH_IMAGE013
) obtain;
Figure 338273DEST_PATH_IMAGE014
Be the base station
Figure 611123DEST_PATH_IMAGE005
Transmitting power;
Figure 2011100309079100001DEST_PATH_IMAGE015
Be the base station
Figure 792760DEST_PATH_IMAGE016
The data that the moment sends;
For user terminal exists
Figure 540005DEST_PATH_IMAGE016
The additive white Gaussian noise that constantly receives;
Figure 498603DEST_PATH_IMAGE018
Be serving BS
Figure 2011100309079100001DEST_PATH_IMAGE019
The useful signal that transmits;
Figure 698509DEST_PATH_IMAGE020
For removing the service base station
Figure 705648DEST_PATH_IMAGE019
Outside the interference signal of other base station;
Therefore, the Signal to Interference plus Noise Ratio of user terminal (SINR) calculates by following formula:
，
Wherein i represents i base station.
3. the many base stations adaptive cooperation transmission data method based on QoS according to claim 1, it is characterized in that: in described step B, user terminal presets and satisfies the pairing Signal to Interference plus Noise Ratio threshold value tabulation of different business QoS demand, the Signal to Interference plus Noise Ratio (SINR) of periodically monitoring the service signal that receives is compared with the Signal to Interference plus Noise Ratio threshold value tabulation of presetting, determine whether to need to propose the cooperation request.
4. the many base stations adaptive cooperation transmission data method based on QoS according to claim 3, it is characterized in that: it is to preset by the type of service classification at user terminal before transfer of data that described user terminal presets the Signal to Interference plus Noise Ratio threshold value tabulation of satisfying different business QoS demand.
5. a kind of many base stations adaptive cooperation transmission data method according to claim 3 based on QoS,
It is characterized in that: the Signal to Interference plus Noise Ratio (SINR) that described user terminal will periodically be monitored the service signal that receives with the step that the Signal to Interference plus Noise Ratio threshold value tabulation of presetting compares is, user terminal periodically calculates the Signal to Interference plus Noise Ratio (SINR) of received signal, and from received signal, parse the type of service of this signal, select the Signal to Interference plus Noise Ratio threshold value of the corresponding business of institute to compare in the Signal to Interference plus Noise Ratio threshold value that from user terminal, the presets tabulation.
6. the many base stations adaptive cooperation transmission data method based on QoS according to claim 3, it is characterized in that: described user terminal determines whether that the step of needs proposition cooperation request is, when the Signal to Interference plus Noise Ratio of the service signal that receives when user terminal is detected (SINR) is less than or equal to the Signal to Interference plus Noise Ratio threshold value of the corresponding business of institute in the Signal to Interference plus Noise Ratio threshold value tabulation of presetting, then need cooperation, send the cooperation request, otherwise user terminal does not send the cooperation request, continues the Signal to Interference plus Noise Ratio (SINR) of monitoring received signal.
7. the many base stations adaptive cooperation transmission data method based on QoS according to claim 1 is characterized in that in step C, described collaboration mode comprises partial cooperative pattern and full collaboration mode.
8. the many base stations adaptive cooperation transmission data method based on QoS according to claim 7 is characterized in that: for described partial cooperative pattern, select the pre-coding matrix of serving BS and cooperative base station should follow following criterion:
Figure 120449DEST_PATH_IMAGE022
，
Wherein i represents i serving BS, and j represents j cooperative base station, Be the code book set.
9. the many base stations adaptive cooperation of stating according to claim 7 based on QoS transmits data method, it is characterized in that: for described full collaboration mode, then select the pre-coding matrix of serving BS and cooperative base station should follow following criterion:
Figure 312265DEST_PATH_IMAGE024
，
Wherein i represents i serving BS, and j represents j cooperative base station,
Figure 937150DEST_PATH_IMAGE023
Be the code book set.
10. the many base stations adaptive cooperation transmission data method based on QoS according to claim 1, it is characterized in that: described serving BS and cooperative base station are meant the base station that the geographical position is adjacent.
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