CN102651888A - Determining method and system for base station aggregation - Google Patents
Determining method and system for base station aggregation Download PDFInfo
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Abstract
The invention discloses a determining method and system for a base station aggregation. The method comprises the steps as follows: acquiring information on a channel from each base station to user equipment (UE); and according to the information on the channel, selecting base stations requiring minimum transmission rate of the UE to form a base station aggregation, and possibly, selecting base stations with capacity gain larger than a specific capacity difference value to form a base station aggregation according to the information on the channel. The base station aggregation is a cooperative base station cluster or a channel state information reporting cluster. The method and the system disclosed by the invention can be applied on various application occasions of a next generation CoMP multi-user multi-antenna system, and can improve the utilization rate of the base stations.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of definite method and system of collection of base stations.
Background technology
Cooperative multipoint transmission (CoMP) technology is one of technology crucial in the LTE-A system, can effectively improve the frequency efficiency of system through the mutual cooperation of minizone.And with respect to single cell system, cooperative transmission system mainly contains two importances and is worthy of consideration: each base station of a. is different to the large scale decline of subscriber equipment (UE).Because the residing position of UE is different, the signal to noise ratio difference that UE reaches each base station is very big.When base station distance UE was far, the efficient of cooperative base station reduced.B. the selection of cooperative base station bunch.In the CoMP system, system at first confirms a big cooperative base station bunch for UE, and the utilization ratio of system can effectively be improved in the base station that how from big cooperative base station bunch, is chosen as the UE cooperation transmission.Therefore, under a certain specific feedback scheme, consider the influence of large scale decline factor, confirm dynamically that based on UE end measured channel information cooperative base station bunch has very important practical sense.
In traditional single cell system, the cell base station at UE place is that UE is the transmission data, the corresponding channel condition information in UE this sub-district of feedback.And under the CoMP scene, main plot and cooperation cell are the UE service jointly, and UE need feed back the channel condition information that comprises main plot and cooperation cell at this moment.Wherein the feedback content of cooperation transmission mainly contains two kinds: the channel quality indication (CQI) of quantification and the pre-coding matrix indication (PMI) that quantizes.Cooperative base station number in the bit number of feedback information and cooperative base station bunch big or small closely related, cooperative base station bunch is many more, needs the bit number of feedback many more; Otherwise the bit number of feedback is few more, and the equivalence of CoMP system is single cell system when no cooperative base station.
At present mainly there are two kinds in definite scheme of CoMP cooperative system base station bunch, and a kind of is the channel condition information of UE end feedback dominant base and all cooperative base station, and base station end is dispatched based on system resource, confirm cooperative base station bunch; A kind of in addition is the UE end group in the selectable feeding back channel state information of measuring of user profile, and base station end is based on the information that feedback obtains then, confirm cooperative base station bunch.Definite scheme related patent U.S. Patent No. about cooperative base station bunch comprises: application number be 200910108074.6 the Chinese patent " a kind of data transmission method and device " and the patent No. United States Patent (USP) " Cluster-based network provisioning " that is 7574179B2 based on cooperative multipoint transmission (based on bunch network configuration).
Wherein application number is that 200910108074.6 Chinese patent UE need measure the channel quality of each base station to UE, when cooperative base station when the UE channel quality meets certain requirements and be set and be cooperative base station, and carry out feedback information.Not enough below it exists: it only considers simply whether the base station reaches limit value to the signal to noise ratio of UE; Based on the base station to the independent channel quality of UE as criterion; Do not consider concrete joint transmission scheme and the demand of UE itself, reduced the efficient of cooperative base station.Not enough below the 7577091B2 United States Patent (USP) exists: cooperative base station bunch be to confirm cooperative base station bunch fully based on desirable channel information by base station end, do not consider the feedback information of UE end and the influence of channel quantitative error.
Summary of the invention
The technical problem that the present invention will solve is exactly the deficiency that overcomes above-mentioned prior art, proposes a kind of definite method and system of collection of base stations, to solve the problem how to confirm cooperative base station bunch or channel status information reports bunch.
In order to address the above problem, the present invention provides a kind of definite method of collection of base stations, comprising:
Obtain the channel information of each base station to subscriber equipment (UE);
According to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, form said collection of base stations; Perhaps,, select the base station of capacity gain, form said collection of base stations greater than the designated capabilities difference according to said channel information;
Said collection of base stations is cooperative base station bunch or channel status information reports bunch.
Preferentially, said method has following characteristics:
Said each base station that obtains comprises to the step of the channel information of UE:
Send the pilot frequency information of said UE according to each base station, estimate channel matrix and energy and the noise of each base station to said UE.
Preferentially, said method has following characteristics:
Said according to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, the step of forming said collection of base stations comprises:
According to energy and the noise of each base station in the said channel information to said UE, calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot;
Calculate current base station and gather the channel capacity of said UE,, then keep the current base station set if said channel capacity satisfies the transmission rate request of said UE; Otherwise, according to signal to noise ratio order from big to small, the base station being added said collection of base stations, the channel capacity of gathering said UE up to current base station satisfies the transmission rate request of said UE, keeps the current base station set.
Preferentially, said method has following characteristics:
Said according to said channel information, select the base station of capacity gain greater than the designated capabilities difference, the step of forming said collection of base stations comprises:
According to energy and the noise of each base station in the said channel information to said UE, calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot;
Calculate current base station and gather the channel capacity of said UE; In the current base station set, add the base station successively,, then the base station that is added is retained in the current base station set if the base station that is added makes capacity gain greater than the designated capabilities difference; Otherwise, remove the base station that is added.
Preferentially, said method has following characteristics:
Gather in the step of channel capacity of said UE calculating current base station,
According to the channel matrix that compiles of channel matrix and the set of signal to noise ratio structure current base station,, and, from code book, select precoding vector based on the maximum principle of equivalent signal-to-noise ratio according to the said channel matrix that compiles; According to precoding vector with compile channel matrix, calculate the channel capacity that current base station is gathered said UE.
In order to address the above problem, the present invention provides a kind of collection of base stations fixed system really, comprises deriving means and choice device, wherein,
Said deriving means is used for, and obtains the channel information of each base station to UE;
Said choice device is used for, and the said channel information that gets access to according to said deriving means selects to satisfy the base station of minimum number of the transmission rate request of said UE, forms said collection of base stations; Perhaps,, select the base station of capacity gain, form said collection of base stations greater than the designated capabilities difference according to the said channel information that said deriving means gets access to;
Said collection of base stations is cooperative base station bunch or channel status information reports bunch.
Preferentially, said system has following characteristics:
Said deriving means is further used for, and sends the pilot frequency information of said UE according to each base station, estimates channel matrix and energy and the noise of each base station to said UE.
Preferentially, said system has following characteristics:
Said choice device is further used for; When according to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, when forming said collection of base stations; According to energy and the noise of each base station in the said channel information to said UE; Calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot; Calculate current base station and gather the channel capacity of said UE,, then keep the current base station set if said channel capacity satisfies the transmission rate request of said UE; Otherwise, according to signal to noise ratio order from big to small, the base station being added said collection of base stations, the channel capacity of gathering said UE up to current base station satisfies the transmission rate request of said UE, keeps the current base station set.
Preferentially, said system has following characteristics:
Said choice device is further used for; When according to said channel information, select the base station of capacity gain, when forming said collection of base stations greater than the designated capabilities difference; According to energy and the noise of each base station in the said channel information to said UE; Calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot; Calculate current base station and gather the channel capacity of said UE; In the current base station set, add the base station successively,, then the base station that is added is retained in the current base station set if the base station that is added makes capacity gain greater than the designated capabilities difference; Otherwise, remove the base station that is added.
Preferentially, said system has following characteristics:
Said choice device is further used for, and according to the channel matrix that compiles of channel matrix and the set of signal to noise ratio structure current base station, according to the said channel matrix that compiles, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, selects precoding vector; According to precoding vector with compile channel matrix, calculate the channel capacity that current base station is gathered said UE.
In the present invention; When whether select the base station be cooperative base station bunch or channel condition information (CSI) report bunch; Whether is not only simple consideration base station reaches limit value to the signal to noise ratio of UE; And be based on the capacity that feedback scheme calculates UE under the corresponding joint transmission scheme, and judge based on two kinds of criterions whether the base station belongs to the relevant base station set, finally confirm cooperative base station or CSI report bunch.According to the cooperative base station of confirming bunch or channel status information reports bunch, UE can feed back corresponding quantization information.
The present invention can be applied to each scene in the CoMP multi-user multi-aerial system of future generation, for example the selection of confirming and comprise the cooperative cluster of via node of the system combined transmission plan cooperative base station of CoMP number.The present invention also can combine with the cooperative base station bunch selection scheme based on base station end, considers base station and UE two ends information asymmetry situation, improves the utilization ratio of base station.
Description of drawings
Fig. 1 is the scene sketch map of CoMP joint transmission in the applying examples of the present invention;
Fig. 2 be applying examples of the present invention according to the cooperative base station bunch definite method flow diagram of first performance criteria based on UE end;
Fig. 3 be applying examples of the present invention according to the cooperative base station bunch definite method flow diagram of first performance criteria based on UE end;
Fig. 4 is the feedback scheme sketch map in the applying examples of the present invention.
Embodiment
Hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.
In order to improve the utilance of cooperative base station, in the present invention, according to channel information; Number with cooperative base station under the situation that satisfies the UE transmission rate is minimum, and perhaps, capacity gain satisfies specified requirement and is foundation; Select collection of base stations, as cooperative base station bunch or channel status information reports bunch.
Wherein, the collection of base stations of channel status information reports bunch finger reporting status information of channel.
Particularly, obtain the channel information of each base station to UE; According to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, form said collection of base stations; Perhaps,, select the base station of capacity gain, form said collection of base stations greater than the designated capabilities difference according to said channel information; Said collection of base stations is cooperative base station bunch or channel status information reports bunch.
Wherein, to cooperative base station bunch or channel status information reports bunch, above-mentioned designated capabilities difference can be different.
Through send the pilot frequency information of said UE according to each base station; Estimate channel matrix and energy and the noise of each base station, obtain the channel information (channel information comprise each base station channel matrix and energy and noise to said UE) of each base station to UE to said UE.
1, first performance criteria: according to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, form said collection of base stations.
In one embodiment, the implementation step according to first selection criterion comprises:
According to energy and the noise of each base station in the said channel information to said UE, calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot;
Calculate current base station and gather the channel capacity of said UE,, then keep the current base station set if said channel capacity satisfies the transmission rate request of said UE; Otherwise, according to signal to noise ratio order from big to small, the base station being added said collection of base stations, the channel capacity of gathering said UE up to current base station satisfies the transmission rate request of said UE, keeps the current base station set.
2, second performance criteria: according to said channel information, select the base station of capacity gain, form said collection of base stations greater than the designated capabilities difference.
In one embodiment, the implementation step according to first selection criterion comprises:
According to energy and the noise of each base station in the said channel information to said UE, calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot;
Calculate current base station and gather the channel capacity of said UE; In the current base station set, add the base station successively,, then the base station that is added is retained in the current base station set if the base station that is added makes capacity gain greater than the designated capabilities difference; Otherwise, remove the base station that is added.
In the above-mentioned implementation step; The channel capacity of gathering said UE through following mode in the calculating current base station: according to the channel matrix that compiles of channel matrix and the set of signal to noise ratio structure current base station; According to the said channel matrix that compiles; And, from code book, select precoding vector based on the maximum principle of equivalent signal-to-noise ratio; According to precoding vector with compile channel matrix, calculate the channel capacity that current base station is gathered said UE.
Correspondingly, the collection of base stations of the embodiment of the invention is fixed system really, comprises deriving means and choice device, wherein,
Said deriving means is used for, and obtains the channel information of each base station to UE;
Said choice device is used for, and the said channel information that gets access to according to said deriving means selects to satisfy the base station of minimum number of the transmission rate request of said UE, forms said collection of base stations; Perhaps,, select the base station of capacity gain, form said collection of base stations greater than the designated capabilities difference according to the said channel information that said deriving means gets access to;
Said collection of base stations is cooperative base station bunch or channel status information reports bunch.
Said system can be applicable to UE, also is applied to the base station.
Said deriving means can be further used for, and sends the pilot frequency information of said UE according to each base station, estimates channel matrix and energy and the noise of each base station to said UE.
Said choice device can be further used for; When according to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, when forming said collection of base stations; According to energy and the noise of each base station in the said channel information to said UE; Calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot; Calculate current base station and gather the channel capacity of said UE,, then keep the current base station set if said channel capacity satisfies the transmission rate request of said UE; Otherwise, according to signal to noise ratio order from big to small, the base station being added said collection of base stations, the channel capacity of gathering said UE up to current base station satisfies the transmission rate request of said UE, keeps the current base station set.
Said choice device can be further used for; When according to said channel information, select the base station of capacity gain, when forming said collection of base stations greater than the designated capabilities difference; According to energy and the noise of each base station in the said channel information to said UE; Calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot; Calculate current base station and gather the channel capacity of said UE; In the current base station set, add the base station successively,, then the base station that is added is retained in the current base station set if the base station that is added makes capacity gain greater than the designated capabilities difference; Otherwise, remove the base station that is added.
Said choice device can be further used for, and according to the channel matrix that compiles of channel matrix and the set of signal to noise ratio structure current base station, according to the said channel matrix that compiles, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, selects precoding vector; According to precoding vector with compile channel matrix, calculate the channel capacity that current base station is gathered said UE.
Further specify the present invention with concrete applying examples below.In the applying examples below, adopt a CoMP joint transmission system, as shown in Figure 1.Three sub-districts are connected by a base station controller (BSC), can equivalence regard a big sub-district as, its can by dominant base and arbitrarily cooperative base station carry out joint transmission for UE jointly.Equivalence is single cell system when dominant base transmits for UE separately.Each base station configuration N root antenna; The antenna configurations of each UE is the M root.UE can estimate to obtain the channel condition information of each base station to UE through measuring reference signals.The cooperative base station that UE selects based on known channel condition information bunch, and feedback corresponding quantization channel information.
As shown in Figure 2, according to first performance criteria, the cooperative base station bunch constant current journey really of holding based on UE comprises in the applying examples of the present invention:
Step 200: receive signal.UE obtains the signal of each base station to UE through reception antenna.
Step 201: measured channel information.UE can estimate to obtain the channel information of each base station to UE by pilot frequency information.Here channel information had both comprised channel matrix H
k, comprising that also the base station declines to the energy of UE and the noise of UE end through large scale, the ratio of energy and noise is the signal to noise ratio that UE is arrived in the base station, ρ here
kExpression, k ∈ in the example of the present invention 1,2,3}.
Step 202: base station ordering.Different according to the residing position of UE, its each base station also is different to the signal to noise ratio of UE.Here sorted in each base station from big to small H according to signal to noise ratio
1Be the channel matrix of dominant base, H to UE
2And H
3Be the channel matrix of alternative cooperative base station to UE.
Step 203: make up and converge channel matrix
.
increases a cooperative base station when being single cell transmission; Converge during i.e. two community associated transmission that maximum three base stations are the UE joint transmission in this example of channel matrix
; Converge the initial channel matrix that converges of channel matrix
this moment and be the channel matrix of main plot to UE, i.e.
Step 204: code word is selected.Based on the maximum principle of equivalent signal-to-noise ratio, from code book ψ, select the codeword vector that prelists
of coupling.Its equivalent signal-to-noise ratio γ, can represent as follows:
Step 205: calculation of capacity.Based on converging channel and corresponding precoding vector, calculate current cooperative base station bunch channel capacity to UE, be also referred to as the equivalent channel capacity of UE:
C
N＝log
2(1+γ) (2)
Wherein N is the number of base station in the CoMP system, corresponding cooperative base station bunch.
Step 206: criterion judgement.The equivalent channel capacity C of the UE that has obtained more
NMinimum speed limit requirement with UE.If the equivalent channel capacity of UE does not then meet performance criteria less than the minimum speed limit requirement of UE, execution in step 207.If the equivalent channel capacity of UE then meets performance criteria more than or equal to the minimum speed limit requirement of UE, execution in step 208.
Step 207: be the cooperative base station bunch adjacent new cooperative base station of interpolation sequence number, and return execution in step 203 to have.
Step 208, with the collection of base stations of this moment as cooperative base station bunch, and with the channel quality information of this cooperative base station bunch feedback quantization and each base station pre-encoding codeword.
As shown in Figure 3, according to second performance criteria, the cooperative base station bunch constant current journey really of holding based on UE comprises in the applying examples of the present invention:
Step 300～305, identical with step 200～step 205.
Step 306 based on current cooperative base station bunch, increases the adjacent alternative cooperative base station of sequence number to create one new bunch, calculates the equivalent capacity C of UE this moment
N+1
Step 307: the gain delta C=C of UE equivalent capacity when calculating this alternative cooperative base station and increasing
N+1-C
N
Step 308: relatively equivalent capacity gain and designated capabilities difference.If the equivalent channel gain of UE is greater than the designated capabilities difference, then should alternative cooperative base station add current cooperative base station bunch, at this moment, with current cooperative base station bunch equivalent channel capacity C to UE
NBe set to equal C
N+1, return execution in step 306.If the channel gain of UE is smaller or equal to the designated capabilities difference, then execution in step 309.
Step 309 is removed the alternative cooperative base station that the last time adds from collection of base stations, with the collection of base stations of this moment as cooperative base station bunch, and with the channel quality information and each base station pre-encoding codeword of this cooperative base station bunch feedback quantization.
As shown in Figure 4, be the UE feedback scheme sketch map in the applying examples of the present invention.
UE feeds back to the channel condition information that the base station, main plot quantizes through control channel, and it comprises CQI and a plurality of PMI.Wherein CQI quantizes to obtain through the equivalent signal to noise ratio.PMI is the corresponding code word in each base station, and number is identical with the number of cooperative base station, can converge the precoding vector into multi-cell system.
In above-mentioned applying examples, implement above-mentioned steps at the UE end, in other embodiments, UE can send to the base station with the channel information that measures, and carries out performance criteria by the base station again and judges.In addition, above-mentioned applying examples is to the confirming of cooperative base station bunch, definite method of channel status information reports bunch is similar, repeats no more here.
More than definite method of the cooperative base station based on UE end provided by the present invention bunch has been carried out detailed introduction.This invention in calculate corresponding channel capacity based on feedback scheme, and based on two kinds of criterions confirm cooperative base station bunch.Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part all can change on embodiment and range of application.In sum, this description should not be construed as limitation of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize, correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (10)
1. definite method of a collection of base stations comprises:
Obtain the channel information of each base station to subscriber equipment (UE);
According to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, form said collection of base stations; Perhaps,, select the base station of capacity gain, form said collection of base stations greater than the designated capabilities difference according to said channel information;
Said collection of base stations is cooperative base station bunch or channel status information reports bunch.
2. the method for claim 1 is characterized in that,
Said each base station that obtains comprises to the step of the channel information of UE:
Send the pilot frequency information of said UE according to each base station, estimate channel matrix and energy and the noise of each base station to said UE.
3. the method for claim 1 is characterized in that,
Said according to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, the step of forming said collection of base stations comprises:
According to energy and the noise of each base station in the said channel information to said UE, calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot;
Calculate current base station and gather the channel capacity of said UE,, then keep the current base station set if said channel capacity satisfies the transmission rate request of said UE; Otherwise, according to signal to noise ratio order from big to small, the base station being added said collection of base stations, the channel capacity of gathering said UE up to current base station satisfies the transmission rate request of said UE, keeps the current base station set.
4. the method for claim 1 is characterized in that,
Said according to said channel information, select the base station of capacity gain greater than the designated capabilities difference, the step of forming said collection of base stations comprises:
According to energy and the noise of each base station in the said channel information to said UE, calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot;
Calculate current base station and gather the channel capacity of said UE; In the current base station set, add the base station successively,, then the base station that is added is retained in the current base station set if the base station that is added makes capacity gain greater than the designated capabilities difference; Otherwise, remove the base station that is added.
5. like claim 3 or 4 described methods, it is characterized in that,
Gather in the step of channel capacity of said UE calculating current base station,
According to the channel matrix that compiles of channel matrix and the set of signal to noise ratio structure current base station,, and, from code book, select precoding vector based on the maximum principle of equivalent signal-to-noise ratio according to the said channel matrix that compiles; According to precoding vector with compile channel matrix, calculate the channel capacity that current base station is gathered said UE.
6. collection of base stations fixed system really is characterized in that, comprises deriving means and choice device, wherein,
Said deriving means is used for, and obtains the channel information of each base station to UE;
Said choice device is used for, and the said channel information that gets access to according to said deriving means selects to satisfy the base station of minimum number of the transmission rate request of said UE, forms said collection of base stations; Perhaps,, select the base station of capacity gain, form said collection of base stations greater than the designated capabilities difference according to the said channel information that said deriving means gets access to;
Said collection of base stations is cooperative base station bunch or channel status information reports bunch.
7. system as claimed in claim 6 is characterized in that,
Said deriving means is further used for, and sends the pilot frequency information of said UE according to each base station, estimates channel matrix and energy and the noise of each base station to said UE.
8. system as claimed in claim 6 is characterized in that,
Said choice device is further used for; When according to said channel information, select to satisfy the base station of minimum number of the transmission rate request of said UE, when forming said collection of base stations; According to energy and the noise of each base station in the said channel information to said UE; Calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot; Calculate current base station and gather the channel capacity of said UE,, then keep the current base station set if said channel capacity satisfies the transmission rate request of said UE; Otherwise, according to signal to noise ratio order from big to small, the base station being added said collection of base stations, the channel capacity of gathering said UE up to current base station satisfies the transmission rate request of said UE, keeps the current base station set.
9. system as claimed in claim 6 is characterized in that,
Said choice device is further used for; When according to said channel information, select the base station of capacity gain, when forming said collection of base stations greater than the designated capabilities difference; According to energy and the noise of each base station in the said channel information to said UE; Calculate the signal to noise ratio of each base station to said UE, the base station that signal to noise ratio is maximum adds said collection of base stations as the base station, main plot; Calculate current base station and gather the channel capacity of said UE; In the current base station set, add the base station successively,, then the base station that is added is retained in the current base station set if the base station that is added makes capacity gain greater than the designated capabilities difference; Otherwise, remove the base station that is added.
10. like claim 8 or 9 described systems, it is characterized in that,
Said choice device is further used for, and according to the channel matrix that compiles of channel matrix and the set of signal to noise ratio structure current base station, according to the said channel matrix that compiles, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, selects precoding vector; According to precoding vector with compile channel matrix, calculate the channel capacity that current base station is gathered said UE.
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| CN107046703A (en) * | 2016-02-05 | 2017-08-15 | 华为技术有限公司 | Connection control method and base station |
| CN108292939A (en) * | 2015-11-25 | 2018-07-17 | 华为技术有限公司 | Method for precoding and device under a kind of MIMO transmission pattern |
| CN108933617A (en) * | 2017-05-22 | 2018-12-04 | 中兴通讯股份有限公司 | Control method, control device and the computer-readable medium that cooperation cell joint is sent |
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| CN108292939A (en) * | 2015-11-25 | 2018-07-17 | 华为技术有限公司 | Method for precoding and device under a kind of MIMO transmission pattern |
| WO2017124900A1 (en) * | 2016-01-21 | 2017-07-27 | 索尼公司 | Electronic device and communication method |
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| CN108933617B (en) * | 2017-05-22 | 2023-05-26 | 中兴通讯股份有限公司 | Control method, control device and computer readable medium for cooperative cell joint transmission |
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