CN101834701B - A kind of method, system and mobile terminal realizing coordinated multipoint transmission - Google Patents

A kind of method, system and mobile terminal realizing coordinated multipoint transmission Download PDF

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CN101834701B
CN101834701B CN201010172626.2A CN201010172626A CN101834701B CN 101834701 B CN101834701 B CN 101834701B CN 201010172626 A CN201010172626 A CN 201010172626A CN 101834701 B CN101834701 B CN 101834701B
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CN101834701A (en
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张峻峰
魏宁
张忠培
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Jiangsu Shengwei Industrial Technology Co.,Ltd.
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ZTE Corp
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Abstract

The invention discloses the method that one realizes coordinated multipoint transmission (CoMP), adjacent cell evolved base station (eNB) transmits the downlink precoding reference signal (RQI-RS) of the beam shaping matrix providing self to adopt; The beam shaping matrix that the adjacent cell eNB that mobile terminal (UE) provides according to RQI-RS adopts, obtains optimum pre-coding matrix index (PMI); UE obtains the channel quality identification (CQI) in spatial domain Inter-Cell Interference Coordination (ICIC), and by the optimum PMI that obtains and CQI feedback to service cell eNB; Service cell eNB is dispatched with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE; The present invention also discloses a kind of system and the mobile terminal that realize coordinated multipoint transmission; By the solution of the present invention, the CoMP of UE spatial domain ICIC can be realized.

Description

A kind of method, system and mobile terminal realizing coordinated multipoint transmission
Technical field
The present invention relates to wireless communication technology, particularly relate to a kind of method, system and the mobile terminal that realize coordinated multipoint transmission.
Background technology
In wireless communications, it is exactly coordinated multipoint transmission (CoMP) that communication for coordination is the most successfully applied, it is enhanced long-period evolution system (LTE-A, LTE Advance) most important enhancement mode transmission technology, be the effective ways solving Cell Edge User and average throughput.In mobile communication system, because the mobile terminal (UE) of cell edge is in interference-limited environment, the modes such as fractional frequency reuse (FFR) generally can be adopted to suppress presence of intercell interference (ICI, Inter-Cell Interference), the average throughput in this region can be reduced like this.In order to satisfied advanced international mobile telecommunication system (IMT-A, International MobileTelecommunication-Advanced) covers and the requirement of capacity for cell edge, the technology such as CoMP must be adopted.
In the standardized process of LTE-A, the progress of current CoMP is relatively slower, although have many optional transmission and feedback scheme, is difficult to build consensus.Under these circumstances, the simple extension for the Inter-Cell Interference Coordination existed in Rel.9 (ICIC, Inter-Cell Interference Coordination) scheme is easy to promote CoMP progress in a standard more.
In LTE+ version 9 (Rel.9), ICIC is by relative narrow band transmission power (RNTP, RNTP, Relative Narrowband Tx Power), UL disturbs excessive instruction (IOI, Interference OverloadIndication) and UL high interference instruction (HII, High Interference Indication) message realizing alternately at X2 interface.The ICIC of Rel.9 mainly realizes at frequency domain, in order to avoid adjacent cell interference, some or several evolved base station (eNB) must be reduced transmitting power or not transmit on fractional bandwidth, such bandwidth that will make is vacant, the availability of frequency spectrum is caused to be lost, if ICIC is expanded to spatial domain, this situation just can be avoided to a great extent to occur.
In prior art, ICIC is expanded to spatial domain to be realized by mode that is optimum or the poorest paired pre-coding matrix index (Best or worst Companion PMIs) mutual between eNB, such as: eNB1 notifies that eNB2 wishes or do not wish its paired pre-coding matrix index adopted; Also can by wishing between eNB that the mode of the signal covariance matrix that adjacent cell adopts realizes alternately.But these methods all require the basis of the feedback content that UE defines at Rel.9 increases new feedback content, and between eNB, need special link to realize the CoMP of spatial domain ICIC, consumption systems is multiple resource comparatively, its validity of transmission delay guarantee that various feedback method needs X2 interface to provide little as far as possible simultaneously, causes still there is dispute to the validity of various feedback method at present.
Summary of the invention
In view of this, main purpose of the present invention is to provide one to realize coordinated multi-point transmission method, system and mobile terminal, make UE under the condition of feedback content substantially not changing Rel.9 definition, realize the CoMP of UE spatial domain ICIC, in performance, save system resource, elevator system average frequency spectrum utilance.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method realizing coordinated multipoint transmission provided by the invention, the method comprises:
Adjacent cell eNB transmits the downlink precoding reference signal (RQI-RS) of the beam shaping matrix providing self to adopt;
The beam shaping matrix that the adjacent cell eNB that UE provides according to RQI-RS adopts, obtains optimum pre-coding matrix index (PMI);
UE obtains the channel quality identification (CQI) of spatial domain ICIC, and by the optimum PMI that obtains and CQI feedback to service cell eNB;
Service cell eNB is dispatched with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE.
In such scheme, the RQI-RS that described adjacent cell eNB transmits the beam shaping matrix providing self to adopt is specially: adjacent cell eNB is on the frequency band that transmitting downlink data is identical, adopt identical spatial domain wave beam, identical power and the identical parameter relevant to downlink data, transmission RQI-RS.
In such scheme, the CQI that described UE obtains spatial domain ICIC is specially: UE determines that the beam shaping method that service cell eNB adopts optimum PMI, adjacent cell eNB to adopt is constant, and the different PRB adopted for service cell eNB or frequency range, UE obtains different CQI.
In such scheme, the beam shaping matrix that the adjacent cell eNB that described UE provides according to RQI-RS adopts, obtains optimum PMI, is specially: the beam shaping matrix setting RQI-RS to provide adjacent cell eNB to adopt is as w i, the channel of adjacent cell eNB to UE is H 2,1, service cell eNB is H to the channel of UE 1,1, σ 2for the noise variance that the every bar reception antenna of UE receives, the optional pre-coding matrix f of UE self nthe code book F formed is F={f 1, f 2..., f n, N is natural number; According to formula below:
w 1 = arg max f ∈ F | | H 1,1 f | | 2 | | f * | | 2 σ 2 + | | f * H 1,1 H 2,1 w I | | 2
Wherein, with w 1the numbering of corresponding matrix in F is as optimum PMI.
A kind of system realizing coordinated multipoint transmission provided by the invention, this system comprises: eNB, UE; Wherein,
Described eNB is divided into adjacent cell eNB and service cell eNB relative to UE;
Adjacent cell eNB, for transmitting the RQI-RS of the beam shaping matrix providing self to adopt;
Service cell eNB, for dispatching with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE;
UE, the beam shaping matrix that the adjacent cell eNB for providing according to RQI-RS adopts, obtains optimum PMI; Obtain the CQI of spatial domain ICIC, and by the optimum PMI that obtains and CQI feedback to service cell eNB.
In such scheme, described UE is specially for the CQI obtaining spatial domain ICIC: UE determines that the beam shaping matrix that service cell eNB adopts optimum PMI, adjacent cell eNB to adopt is constant, the different PRB adopted for service cell eNB or frequency range, UE obtains different CQI.
A kind of UE realizing coordinated multipoint transmission provided by the invention, this UE comprises: PMI module, CQI module, feedback module; Wherein,
PMI module, the beam shaping matrix that the adjacent cell eNB for providing according to RQI-RS adopts, obtains optimum PMI;
CQI module, for obtaining the CQI of spatial domain ICIC;
Feedback module, for the optimum PMI that will obtain and CQI feedback to service cell eNB.
A kind of method, system and mobile terminal realizing coordinated multipoint transmission provided by the invention, adjacent cell eNB transmits the RQI-RS of the beam shaping matrix providing self to adopt; The beam shaping matrix that the adjacent cell eNB that UE provides according to RQI-RS adopts, obtains optimum PMI; UE obtains the CQI of spatial domain ICIC, and by the optimum PMI that obtains and CQI feedback to service cell eNB; Service cell eNB is dispatched with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE; So, can make UE under the condition of feedback content substantially not changing Rel.9 definition, realize the CoMP of UE spatial domain ICIC, compared with prior art, the dedicated link realizing spatial domain ICIC between eNB is saved, in performance, save system resource, elevator system average frequency spectrum utilance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention realizes the method flow of coordinated multipoint transmission;
Fig. 2 is the schematic diagram that the present invention realizes the system configuration of coordinated multipoint transmission;
Fig. 3 is the structural representation that the present invention realizes the mobile terminal of coordinated multipoint transmission.
Embodiment
Basic thought of the present invention is: adjacent cell eNB transmits the RQI-RS of the beam shaping matrix providing self to adopt; The beam shaping matrix that the adjacent cell eNB that UE provides according to RQI-RS adopts, obtains optimum PMI; UE obtains the CQI of spatial domain ICIC, and by the optimum PMI that obtains and CQI feedback to service cell eNB; Service cell eNB is dispatched with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE.
Below by drawings and the specific embodiments, the present invention is described in further detail.
The present invention realizes the method for coordinated multipoint transmission, and as shown in Figure 1, the method comprises following step;
Step 101: adjacent cell eNB transmits the RQI-RS of the beam shaping matrix providing self to adopt;
Concrete, adjacent cell eNB, on the frequency band that transmitting downlink data is identical, adopts identical spatial domain wave beam, identical power and the identical parameter relevant to downlink data, transmission RQI-RS;
Described RQI-RS is designed to low expense precoding reference signal (LPRS, Low-overheadPrecoded Reference Signals), the information such as spatial domain wave beam and signal madulation mode of either own cell signal can be indicated, be used to estimate the upper interference characteristic being in short-term about to transmission data of corresponding time/frequency source block (PRB), the beam shaping matrix providing adjacent cell eNB to adopt and other features of signal;
The beam shaping matrix that the adjacent cell eNB that step 102:UE provides according to RQI-RS adopts, obtains optimum PMI;
Concrete, when UE is in the edge of Serving cell and adjacent cell, be subject to the interference of adjacent cell signal, now, Maximal ratio combiner (MRC is adopted with UE, Maximum Ratio Combining) technology receive RQI-RS be example, if the beam shaping matrix that RQI-RS provides adjacent cell eNB to adopt is w i, UE, by channel estimating, obtains: the channel of adjacent cell eNB to UE is H 2,1, service cell eNB is H to the channel of UE 1,1, σ 2for the noise variance that the every bar reception antenna of UE receives, the optional pre-coding matrix f of UE self nthe code book F formed is F={f 1, f 2..., f n, N is natural number; According to formula (1):
w 1 = arg max f ∈ F | | H 1,1 f | | 2 | | f * | | 2 σ 2 + | | f * H 1,1 H 2,1 w I | | 2 - - - ( 1 )
Wherein, w is selected 1the numbering of corresponding matrix in F is as optimum PMI.
Step 103:UE obtains the CQI of spatial domain ICIC;
Concrete, UE supposes that the beam shaping method that service cell eNB adopts optimum PMI, adjacent cell eNB to adopt is constant, and namely beam shaping matrix is constant, the different PRB that service cell eNB is adopted or frequency range, UE obtains different CQI, and wherein the algorithm of CQI is prior art, does not repeat at this.
Step 104:UE by the optimum PMI that obtains and CQI feedback to service cell eNB;
Step 105: service cell eNB is dispatched with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE;
Scheduling described in this step adopts the scheduling mode in Rel.9.
Based on said method, present invention also offers a kind of system realizing coordinated multipoint transmission, as shown in Figure 2, this system comprises: eNB, UE 21; Wherein,
Described eNB can be divided into adjacent cell eNB 22 and service cell eNB 23 relative to UE 21;
Adjacent cell eNB 22, for transmitting the RQI-RS of the beam shaping matrix providing self to adopt;
Service cell eNB 23, for dispatching with reference to the CQI value of UE 21 spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE 21;
UE 21, the beam shaping matrix that the adjacent cell eNB 22 for providing according to RQI-RS adopts, obtains optimum PMI; Obtain the CQI of spatial domain ICIC, and by the optimum PMI that obtains and CQI feedback to service cell eNB 23;
The CQI that described UE 21 obtains spatial domain ICIC is specially: UE 21 supposes that the beam shaping matrix that service cell eNB 23 adopts optimum PMI, adjacent cell eNB 21 to adopt is constant, the different PRB that service cell eNB 23 is adopted or frequency range, UE 21 obtains different CQI;
Further, described UE 21 as shown in Figure 3, comprising: PMI module 211, CQI module 212, feedback module 213; Wherein,
PMI module 211, the beam shaping matrix that the adjacent cell eNB for providing according to RQI-RS adopts, obtains optimum PMI;
CQI module 212, for obtaining the CQI of spatial domain ICIC;
Feedback module 213, for the optimum PMI that will obtain and CQI feedback to service cell eNB.
Based on said system, the present invention also provides a kind of UE realizing coordinated multipoint transmission, and UE21 as shown in Figure 3, comprising: PMI module 211, CQI module 212, feedback module 213; Wherein,
PMI module 211, the beam shaping matrix that the adjacent cell eNB for providing according to RQI-RS adopts, obtains optimum PMI;
CQI module 212, for obtaining the CQI of spatial domain ICIC;
Feedback module 213, for the optimum PMI that will obtain and CQI feedback to service cell eNB.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. realize a method for coordinated multipoint transmission, it is characterized in that, the method comprises:
Adjacent cell evolved base station (eNB) transmits the downlink precoding reference signal (RQI-RS) of the beam shaping matrix providing self to adopt;
The beam shaping matrix that the adjacent cell eNB that mobile terminal (UE) provides according to RQI-RS adopts, obtains optimum pre-coding matrix index (PMI);
UE obtains the channel quality identification (CQI) in spatial domain Inter-Cell Interference Coordination (ICIC), and by the optimum PMI that obtains and CQI feedback to service cell eNB;
Service cell eNB is dispatched with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE.
2. method according to claim 1, it is characterized in that, the RQI-RS that described adjacent cell eNB transmits the beam shaping matrix providing self to adopt is specially: adjacent cell eNB is on the frequency band that transmitting downlink data is identical, adopt identical spatial domain wave beam, identical power and the identical parameter relevant to downlink data, transmission RQI-RS.
3. method according to claim 1, it is characterized in that, the CQI that described UE obtains spatial domain ICIC is specially: UE determines that the beam shaping method that service cell eNB adopts optimum PMI, adjacent cell eNB to adopt is constant, the different PRB adopted for service cell eNB or frequency range, UE obtains different CQI.
4. method according to claim 1, is characterized in that, the beam shaping matrix that the adjacent cell eNB that described UE provides according to RQI-RS adopts, and obtains optimum PMI, is specially: the beam shaping matrix setting RQI-RS to provide adjacent cell eNB to adopt is as w i, the channel of adjacent cell eNB to UE is H 2,1, service cell eNB is H to the channel of UE 1,1, σ 2for the noise variance that the every bar reception antenna of UE receives, the optional pre-coding matrix f of UE self nthe code book F formed is F={f 1, f 2..., f n, N is natural number; According to formula below:
w 1 = arg max f ∈ F || H 1 , 1 f || 2 || f * || 2 σ 2 + || f * H 1 , 1 H 2 , 1 w I || 2
Wherein, with w 1the numbering of corresponding matrix in F is as optimum PMI.
5. realize a system for coordinated multipoint transmission, it is characterized in that, this system comprises: eNB, UE; Wherein,
Described eNB is divided into adjacent cell eNB and service cell eNB relative to UE;
Adjacent cell eNB, for transmitting the RQI-RS of the beam shaping matrix providing self to adopt;
Service cell eNB, for dispatching with reference to the CQI value of UE spatial domain ICIC, utilizes optimum PMI transmission through the signal of optimum precoding to UE;
UE, the beam shaping matrix that the adjacent cell eNB for providing according to RQI-RS adopts, obtains optimum PMI; Obtain the CQI of spatial domain ICIC, and by the optimum PMI that obtains and CQI feedback to service cell eNB.
6. system according to claim 5, it is characterized in that, described UE is specially for the CQI obtaining spatial domain ICIC: UE determines that the beam shaping matrix that service cell eNB adopts optimum PMI, adjacent cell eNB to adopt is constant, the different PRB adopted for service cell eNB or frequency range, UE obtains different CQI.
7. the system according to claim 5 or 6, is characterized in that, described UE comprises: PMI module, CQI module, feedback module; Wherein,
PMI module, the beam shaping matrix that the adjacent cell eNB for providing according to RQI-RS adopts, obtains optimum PMI;
CQI module, for obtaining the CQI of spatial domain ICIC;
Feedback module, for the optimum PMI that will obtain and CQI feedback to service cell eNB.
8. realize a UE for coordinated multipoint transmission, it is characterized in that, this UE comprises: PMI module, CQI module, feedback module; Wherein,
PMI module, the beam shaping matrix providing adjacent cell eNB to adopt for setting RQI-RS is as w i, the channel of adjacent cell eNB to UE is H 2,1, service cell eNB is H to the channel of UE 1,1, σ 2for the noise variance that the every bar reception antenna of UE receives, the optional pre-coding matrix f of UE self nthe code book F formed is F={f 1, f 2..., f n, N is natural number; According to formula below:
w 1 = arg max f ∈ F || H 1 , 1 f || 2 || f * || 2 σ 2 + || f * H 1 , 1 H 2 , 1 w I || 2
Wherein, with w 1the numbering of corresponding matrix in F is as optimum PMI;
CQI module, for obtaining the CQI of spatial domain ICIC;
Feedback module, for the optimum PMI that will obtain and CQI feedback to service cell eNB.
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