CN102651888B - Determining method and system for base station aggregation - Google Patents
Determining method and system for base station aggregation Download PDFInfo
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- CN102651888B CN102651888B CN201110044959.1A CN201110044959A CN102651888B CN 102651888 B CN102651888 B CN 102651888B CN 201110044959 A CN201110044959 A CN 201110044959A CN 102651888 B CN102651888 B CN 102651888B
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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, particularly relate to a kind of determination method and system of collection of base stations.
Background technology
Cooperative multipoint transmission (CoMP) technology is one of technology of key in lte-a system, effectively can be improved the frequency efficiency of system by the mutual cooperation of minizone.And relative 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).Position residing for UE is different, and the signal to noise ratio difference that UE reaches each base station is very large.When base station distance UE is far, the efficiency of cooperative base station reduces.B. the selection of cooperative base station bunch.In CoMP system, first system determines a large cooperative base station bunch for UE, and the utilization ratio of system effectively can be improved in the base station how being chosen as UE cooperation transmission from large cooperative base station bunch.Therefore, under a certain specific feedback scheme, consider the impact of large scale decline factor, the channel information measured based on UE end dynamically determines that cooperative base station bunch has very important realistic meaning.
In traditional single cell system, the cell base station at UE place is UE is transmission data, and UE feeds back the corresponding channel condition information in this community.And under CoMP scene, main plot and cooperation cell are UE service jointly, UE now needs to feed back the channel condition information comprising main plot and cooperation cell.Wherein the feedback content of cooperation transmission mainly contains two kinds: channel quality instruction (CQI) of quantification and pre-coding matrix instruction (PMI) of quantification.The size of the bit number of feedback information and cooperative base station bunch is closely related, and the cooperative base station number in cooperative base station bunch is more, needs the bit number of feedback more; Otherwise the bit number of feedback is fewer, when being equivalent to single cell system without CoMP system during cooperative base station.
The determination scheme of current CoMP system cooperative base station bunch mainly exists two kinds, 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, determine cooperative base station bunch; Another is UE end group in the selectable feeding back channel state information of user profile measured, and then base station end is based on feeding back the information obtained, determine cooperative base station bunch.Determination scheme Patents about cooperative base station bunch comprises: application number be 200910108074.6 Chinese patent " a kind of data transmission method based on cooperative multipoint transmission and device " and the patent No. be 7574179B2 United States Patent (USP) " Cluster-based network provisioning " (based on bunch network configuration).
Wherein application number be 200910108074.6 Chinese patent UE need to measure the channel quality of each base station to UE, when cooperative base station meets certain requirements to UE channel quality and set it to cooperative base station, and carry out information feed back.It has the following disadvantages: it only simply considers whether base station reaches limit value to the signal to noise ratio of UE, based on base station to the independent channel quality of UE as criterion, do not consider concrete joint transmission scheme and the demand of UE itself, reduce the efficiency of cooperative base station.7577091B2 United States Patent (USP) has the following disadvantages: cooperative base station bunch be determine cooperative base station bunch by base station end completely based on desirable channel information, do not consider the impact of the feedback information that UE holds and channel quantitative error.
Summary of the invention
The technical problem to be solved in the present invention overcomes above-mentioned the deficiencies in the prior art exactly, proposes a kind of determination method and system of collection of base stations, to solve the problem how determining cooperative base station bunch or channel status information reports bunch.
In order to solve the problem, the invention provides a kind of defining method of collection of base stations, comprising:
Obtain the channel information of each base station to subscriber equipment (UE);
According to described channel information, select the base station meeting the minimum number of the transmission rate request of described UE, form described collection of base stations; Or, according to described channel information, select capacity gain to be greater than the base station of designated capabilities difference, form described collection of base stations;
Described collection of base stations is cooperative base station bunch or channel status information reports bunch.
Preferentially, said method has following characteristics:
The each base station of described acquisition comprises to the step of the channel information of UE:
Send the pilot frequency information of described UE according to each base station, estimate that each base station is to the channel matrix of described UE and energy and noise.
Preferentially, said method has following characteristics:
Described according to described channel information, select the base station meeting the minimum number of the transmission rate request of described UE, the step forming described collection of base stations comprises:
According to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations;
Calculate the channel capacity of current base station set to described UE, if described channel capacity meets the transmission rate request of described UE, then retain current base station set; Otherwise, according to signal to noise ratio order from big to small, base station is added described collection of base stations, until current base station set meets the transmission rate request of described UE to the channel capacity of described UE, retains current base station set.
Preferentially, said method has following characteristics:
Described according to described channel information, select capacity gain to be greater than the base station of designated capabilities difference, the step forming described collection of base stations comprises:
According to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations;
Calculate the channel capacity of current base station set to described UE, in current base station set, add base station successively, if the base station added makes capacity gain be greater than designated capabilities difference, then added base station is retained in current base station set, otherwise, remove added base station.
Preferentially, said method has following characteristics:
In the set of calculating current base station in the step of the channel capacity of described UE,
What build current base station set according to channel matrix and signal to noise ratio collects channel matrix, collects channel matrix according to described, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, selects precoding vector; According to precoding vector and collect channel matrix, calculate the channel capacity of current base station set to described UE.
In order to solve the problem, the invention provides a kind of certainty annuity of collection of base stations, comprise acquisition device and choice device, wherein,
Described acquisition device is used for, and obtains the channel information of each base station to UE;
Described choice device is used for, and according to the described channel information that described acquisition device gets, selects the base station meeting the minimum number of the transmission rate request of described UE, forms described collection of base stations; Or, according to the described channel information that described acquisition device gets, select capacity gain to be greater than the base station of designated capabilities difference, form described collection of base stations;
Described collection of base stations is cooperative base station bunch or channel status information reports bunch.
Preferentially, said system has following characteristics:
Described acquisition device is further used for, and sends the pilot frequency information of described UE according to each base station, estimates that each base station is to the channel matrix of described UE and energy and noise.
Preferentially, said system has following characteristics:
Described choice device is further used for, when according to described channel information, select the base station meeting the minimum number of the transmission rate request of described UE, when forming described collection of base stations, according to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations; Calculate the channel capacity of current base station set to described UE, if described channel capacity meets the transmission rate request of described UE, then retain current base station set; Otherwise, according to signal to noise ratio order from big to small, base station is added described collection of base stations, until current base station set meets the transmission rate request of described UE to the channel capacity of described UE, retains current base station set.
Preferentially, said system has following characteristics:
Described choice device is further used for, when according to described channel information, capacity gain is selected to be greater than the base station of designated capabilities difference, when forming described collection of base stations, according to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations; Calculate the channel capacity of current base station set to described UE, in current base station set, add base station successively, if the base station added makes capacity gain be greater than designated capabilities difference, then added base station is retained in current base station set, otherwise, remove added base station.
Preferentially, said system has following characteristics:
Described choice device is further used for, and what build current base station set according to channel matrix and signal to noise ratio collects channel matrix, collects channel matrix according to described, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, selects precoding vector; According to precoding vector and collect channel matrix, calculate the channel capacity of current base station set to described UE.
In the present invention, select base station be whether cooperative base station bunch or channel condition information (CSI) report bunch time, be not only simply consider whether base station reaches limit value to the signal to noise ratio of UE, but the capacity of UE under corresponding joint transmission scheme is calculated based on feedback scheme, and judge whether base station belongs to corresponding collection of base stations based on two kinds of criterions, finally determine cooperative base station or CSI report bunch.According to the cooperative base station determined bunch or channel status information reports bunch, UE can feed back corresponding quantitative information.
The present invention can be applied to each scene in CoMP multi-user multi-aerial system of future generation, the determination of such as CoMP system joint transmission scheme cooperative base station number and comprise the selection of cooperative cluster of via node.The present invention also can be combined 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.
Accompanying drawing explanation
Fig. 1 is the scene schematic diagram of CoMP joint transmission in application example of the present invention;
Fig. 2 is the cooperative base station bunch defining method flow chart held based on UE according to the first performance criteria of application example of the present invention;
Fig. 3 is the cooperative base station bunch defining method flow chart held based on UE according to the first performance criteria of application example of the present invention;
Fig. 4 is the feedback scheme schematic diagram in application example of the present invention.
Embodiment
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
In order to improve the utilance of cooperative base station, in the present invention, according to channel information, when to meet UE transmission rate, the number of cooperative base station is minimum, or capacity gain satisfies specified requirement as foundation, select collection of base stations, as cooperative base station bunch or channel status information reports bunch.
Wherein, channel status information reports bunch refers to the collection of base stations of reporting status information of channel.
Particularly, the channel information of each base station to UE is obtained; According to described channel information, select the base station meeting the minimum number of the transmission rate request of described UE, form described collection of base stations; Or, according to described channel information, select capacity gain to be greater than the base station of designated capabilities difference, form described collection of base stations; Described collection of base stations is cooperative base station bunch or channel status information reports bunch.
Wherein, for cooperative base station bunch or channel status information reports bunch, above-mentioned designated capabilities difference can be different.
By sending the pilot frequency information of described UE according to each base station, estimate that each base station is to the channel matrix of described UE and energy and noise, obtain the channel information (channel information comprise each base station to the channel matrix of described UE and energy and noise) of each base station to UE.
1, the first performance criteria: according to described channel information, selects the base station meeting the minimum number of the transmission rate request of described UE, forms described collection of base stations.
In one embodiment, comprise according to the implementation step of the first selection criterion:
According to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations;
Calculate the channel capacity of current base station set to described UE, if described channel capacity meets the transmission rate request of described UE, then retain current base station set; Otherwise, according to signal to noise ratio order from big to small, base station is added described collection of base stations, until current base station set meets the transmission rate request of described UE to the channel capacity of described UE, retains current base station set.
2, the second performance criteria: according to described channel information, selects capacity gain to be greater than the base station of designated capabilities difference, forms described collection of base stations.
In one embodiment, comprise according to the implementation step of the first selection criterion:
According to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations;
Calculate the channel capacity of current base station set to described UE, in current base station set, add base station successively, if the base station added makes capacity gain be greater than designated capabilities difference, then added base station is retained in current base station set, otherwise, remove added base station.
In above-mentioned implementation step, calculating the current base station set channel capacity to described UE in the following way: collect channel matrix according to channel matrix and the set of signal to noise ratio structure current base station, channel matrix is collected according to described, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, select precoding vector; According to precoding vector and collect channel matrix, calculate the channel capacity of current base station set to described UE.
Correspondingly, the certainty annuity of the collection of base stations of the embodiment of the present invention, comprises acquisition device and choice device, wherein,
Described acquisition device is used for, and obtains the channel information of each base station to UE;
Described choice device is used for, and according to the described channel information that described acquisition device gets, selects the base station meeting the minimum number of the transmission rate request of described UE, forms described collection of base stations; Or, according to the described channel information that described acquisition device gets, select capacity gain to be greater than the base station of designated capabilities difference, form described collection of base stations;
Described collection of base stations is cooperative base station bunch or channel status information reports bunch.
Said system can be applicable to UE, is also applied to base station.
Described acquisition device can be further used for, and sends the pilot frequency information of described UE according to each base station, estimates that each base station is to the channel matrix of described UE and energy and noise.
Described choice device can be further used for, when according to described channel information, select the base station meeting the minimum number of the transmission rate request of described UE, when forming described collection of base stations, according to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations; Calculate the channel capacity of current base station set to described UE, if described channel capacity meets the transmission rate request of described UE, then retain current base station set; Otherwise, according to signal to noise ratio order from big to small, base station is added described collection of base stations, until current base station set meets the transmission rate request of described UE to the channel capacity of described UE, retains current base station set.
Described choice device can be further used for, when according to described channel information, capacity gain is selected to be greater than the base station of designated capabilities difference, when forming described collection of base stations, according to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations; Calculate the channel capacity of current base station set to described UE, in current base station set, add base station successively, if the base station added makes capacity gain be greater than designated capabilities difference, then added base station is retained in current base station set, otherwise, remove added base station.
Described choice device can be further used for, and what build current base station set according to channel matrix and signal to noise ratio collects channel matrix, collects channel matrix according to described, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, selects precoding vector; According to precoding vector and collect channel matrix, calculate the channel capacity of current base station set to described UE.
The present invention is further illustrated below with concrete application example.In application example below, adopt a CoMP joint transmission system, as shown in Figure 1.Three communities are connected by a base station controller (BSC), can equivalence regard a Ge great community as, it can by dominant base and arbitrary cooperative base station jointly for UE carries out joint transmission.When dominant base is separately for being equivalent to single cell system when UE transmits.Each base station configuration N root antenna; The antenna configuration of each UE is M root.UE can estimate to obtain the channel condition information of each base station to UE by measuring reference signals.The cooperative base station bunch that UE selects based on known channel condition information, and feed back corresponding quantized channel information.
As shown in Figure 2, according to the first performance criteria in application example of the present invention, the cooperative base station bunch constant current journey really based on UE end comprises:
Step 200: Received signal strength.UE obtains the signal of each base station to UE by reception antenna.
Step 201: measure channel information.UE can estimate to obtain the channel information of each base station to UE by pilot frequency information.Here channel information both comprised channel matrix H
k, also comprise base station and decline 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 base station, here ρ
krepresent, k ∈ { 1,2,3} in example of the present invention.
Step 202: ranking base stations.Position residing for UE is different, and its each base station is also different to the signal to noise ratio of UE.Here sorted in each base station from big to small according to signal to noise ratio, H
1be the channel matrix of dominant base to UE, H
2and H
3be the channel matrix of alternative cooperative base station to UE.
Step 203: build and converge channel matrix
.When for single cell transmission
increase a cooperative base station, namely converge channel matrix during two community associated transmission
in this example, maximum three base stations are UE joint transmission, now converge channel matrix
initial convergence channel matrix is the channel matrix of main plot to UE, namely
Step 204: codeword selection.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 be expressed as follows:
the same with the number of cooperative base station, such as, when 2 base stations are UE cooperation transmission
Step 205: calculation of capacity.Based on convergence channel and corresponding precoding vector, calculate the channel capacity that current cooperative base station bunch arrives UE, the equivalent channel capacity also referred to as UE:
C
N＝log
2(1+γ) (2)
Wherein N is the number of base station in CoMP system, corresponding cooperative base station bunch.
Step 206: criterion is adjudicated.The equivalent channel capacity C of the UE more obtained
nwith the minimum speed limit requirement of UE.If the equivalent channel capacity of UE is less than the minimum speed limit requirement of UE, then do not meet performance criteria, perform step 207.If the equivalent channel capacity of UE is more than or equal to the minimum speed limit requirement of UE, then meet performance criteria, perform step 208.
Step 207: for adding the adjacent new cooperative base station of sequence number with the cooperative base station had bunch, and return execution step 203.
Step 208, using collection of base stations now 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 the second performance criteria in application example of the present invention, the cooperative base station bunch constant current journey really based on UE end comprises:
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 now UE
n+1.
Step 307: the gain delta C=C calculating UE equivalent capacity when this alternative cooperative base station increases
n+1-C
n.
Step 308: compare equivalent capacity gain and designated capabilities difference.If the equivalent channel gain of UE is greater than designated capabilities difference, then this alternative cooperative base station is added current cooperative base station bunch, now, current cooperative base station bunch is arrived the equivalent channel capacity C of UE
nbe set to equal C
n+1, return and perform step 306.If the channel gain of UE is less than or equal to designated capabilities difference, then perform step 309.
Step 309, the alternative cooperative base station added the last time is removed from collection of base stations, using collection of base stations now 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 4, be the UE feedback scheme schematic diagram in application example of the present invention.
UE feeds back to the channel condition information of base station, main plot quantification by control channel, and it comprises CQI and multiple PMI.Wherein CQI is by quantizing to obtain to equivalent signal-to-noise ratio.PMI is code word corresponding to 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 application example, implement above-mentioned steps at UE end, in other embodiments, UE can send to base station by measuring the channel information obtained, then carries out performance criteria judgement by base station.In addition, above-mentioned application example is the determination for cooperative base station bunch, and the defining method of channel status information reports bunch is similar, repeats no more herein.
Above the defining method of the cooperative base station bunch based on UE end provided by the present invention is described in detail.Calculate corresponding channel capacity based on feedback scheme in this invention, and based on two kinds of criterion determination cooperative base station bunch.Apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize, and correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (4)
1. a defining method for collection of base stations, comprising:
Obtain the channel information of each base station to subscriber equipment (UE);
According to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations;
Calculate the channel capacity of current base station set to described UE, if described channel capacity meets the transmission rate request of described UE, then retain current base station set; Otherwise, according to signal to noise ratio order from big to small, base station is added described collection of base stations, until current base station set meets the transmission rate request of described UE to the channel capacity of described UE, retains current base station set; Or, calculate current base station set to the channel capacity of described UE, in current base station set, add base station successively, if the base station added makes capacity gain be greater than designated capabilities difference, then added base station is retained in current base station set, otherwise, remove added base station;
Wherein, in calculating current base station set in the step of the channel capacity of described UE, what build current base station set according to channel matrix and signal to noise ratio collects channel matrix, collects channel matrix according to described, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, select precoding vector; According to precoding vector and collect channel matrix, calculate the channel capacity of current base station set to described UE;
Described 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,
The each base station of described acquisition comprises to the step of the channel information of UE:
Send the pilot frequency information of described UE according to each base station, estimate that each base station is to the channel matrix of described UE and energy and noise.
3. a certainty annuity for collection of base stations, is characterized in that, comprises acquisition device and choice device, wherein,
Described acquisition device is used for, and obtains the channel information of each base station to UE;
Described choice device is used for, and according to each base station in described channel information to the energy of described UE and noise, calculates the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, adds described collection of base stations; Calculate the channel capacity of current base station set to described UE, if described channel capacity meets the transmission rate request of described UE, then retain current base station set; Otherwise, according to signal to noise ratio order from big to small, base station is added described collection of base stations, until current base station set meets the transmission rate request of described UE to the channel capacity of described UE, retains current base station set; Or, according to each base station in described channel information to the energy of described UE and noise, calculate the signal to noise ratio of each base station to described UE, using base station maximum for signal to noise ratio as base station, main plot, add described collection of base stations; Calculate the channel capacity of current base station set to described UE, in current base station set, add base station successively, if the base station added makes capacity gain be greater than designated capabilities difference, then added base station is retained in current base station set, otherwise, remove added base station;
Described choice device is further used for, and what build current base station set according to channel matrix and signal to noise ratio collects channel matrix, collects channel matrix according to described, and based on the maximum principle of equivalent signal-to-noise ratio, from code book, selects precoding vector; According to precoding vector and collect channel matrix, calculate the channel capacity of current base station set to described UE;
Described collection of base stations is cooperative base station bunch or channel status information reports bunch.
4. system as claimed in claim 3, is characterized in that,
Described acquisition device is further used for, and sends the pilot frequency information of described UE according to each base station, estimates that each base station is to the channel matrix of described UE and energy and noise.
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| CN104301968B (en) * | 2014-10-16 | 2017-07-04 | 电子科技大学 | A kind of method that access base station cluster is chosen for mobile station |
| CN104869610B (en) * | 2015-05-12 | 2018-02-06 | 电子科技大学 | A kind of method that same group of access base station cluster is chosen for multiple mobile stations |
| 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 |
| CN106993322B (en) | 2016-01-21 | 2022-07-01 | 索尼公司 | Electronic device and communication method |
| CN107046703B (en) * | 2016-02-05 | 2021-01-29 | 华为技术有限公司 | Access control method and base station |
| CN107734462A (en) * | 2016-08-10 | 2018-02-23 | 索尼公司 | Electronic equipment and method in radio communication |
| 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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