CN101888637B - Multi-slot cooperative communication method for multiple base stations - Google Patents

Multi-slot cooperative communication method for multiple base stations Download PDF

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CN101888637B
CN101888637B CN 200910051074 CN200910051074A CN101888637B CN 101888637 B CN101888637 B CN 101888637B CN 200910051074 CN200910051074 CN 200910051074 CN 200910051074 A CN200910051074 A CN 200910051074A CN 101888637 B CN101888637 B CN 101888637B
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base station
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communication
edge
cooperation cell
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CN101888637A (en
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赵巍
杨秀梅
熊勇
朱磊
贾国庆
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Shanghai Research Center for Wireless Communications
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Shanghai Research Center for Wireless Communications
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Abstract

The invention discloses a multi-slot cooperative communication method for multiple base stations. The method comprises the following steps of: pre-setting the network topology structures of communication systems with different slot types; selecting a corresponding cooperative cell and the slot type of the cooperative cell for a user needing cooperative communication by using a cooperative slot type selecting device; and coordinating a base station connected with the cooperative cell through a central cooperator corresponding to the cooperative cell to serve the user. The method has the advantages of solving the problem that some cell edge users cannot acquire the services of three optimal base stations at the same time in the conventional method and effectively improving the communication quality of the edge users.

Description

A kind of multi-slot cooperative communication method for multiple base stations
Technical field
The present invention relates to a kind of multi-base station cooperative communication system and communication means thereof, particularly a kind of multi-slot multi-base station cooperative communication system and communication means thereof.
Background technology
Along with the growth at full speed of mobile data services, the customer requirements mobile communication system higher service speed and better service quality be provided.So next generation mobile communication system need support higher spectrum efficiency and more perfect QoS to ensure.See also Fig. 1, in many sub-districts unicast modular system of prior art, the user in this sub-district is only served in each base station.The frequency band that Inter-Cell Interference Coordination Technology Need adjacent base station is distributed to Cell Edge User does not overlap mutually, makes the co-channel interference minimum.In the frequency band, the multiplexing factor for the Cell Center User use of grid mark is 1 frequency band shown in the figure, and black is that the multiplexing factor of Cell Edge User use is 3 frequency band, and white is the obsolete frequency band of current area.Yet although the Inter-Cell Interference Coordination technology is ripe relatively, the cochannel that the channeling of neighbor cell brings disturbs still stronger, and this sub-district mobile subscriber will receive two class signals: the useful signal of this sub-district and the interference signal of neighbor cell.Because the portable terminal complexity is limited, interference signal usually is modeled as additive noise, and portable terminal adopts single user's detection mode to recover to send signal.Therefore, many sub-districts multi-user system of the unicast pattern of prior art is an interference-limited system, and network capacity is significantly less than disturbs not constrained system.
Therefore, prior art has developed the multi-base station cooperative communication system.Because base station location maintains static in the multi-cell system, thereby the high speed between the base station reliably is connected to become possibility.In a single day reliable communication links between the base station is set up, and communication mode can be different from the unicast pattern of prior art fully.At this moment, a plurality of base stations can share and the mobile subscriber between channel condition information and user data information, the central synergist that connects a plurality of base stations is according to one group of channel status optimized distribution customer traffic between many base stations, send jointly via a plurality of base stations then, thereby form a kind of transmission mode of multipoint cooperative.This transmission mode changes the interference signal in traditional unicast into to the mobile subscriber useful signal, has broken through the interference-limited capacity of the non-cooperative system of single-point theoretically.A plurality of base stations need a plurality of base stations to coordinate a shared frequency band to collaboration user for the user serves simultaneously.If whole network only disposes a central synergist, come the dynamic assignment band resource can reach optimum performance certainly by it according to the real-time network data amount, but this dynamic scheme complexity is very high, and the scale exponentially level of complexity calcaneus rete network relation.So consider the technology realizability, static distributed frequency planning is effective means.See also Fig. 2, among the 3GPP LTE-A, a kind of fixed frequency programme has been proposed, the frequency band for the Cell Center User use of grid mark, black is the frequency band that collaboration user uses, and adjacent base station need distribute identical frequency band for Cell Edge User in the multi-base station cooperative communication system.The central area of three base stations that set to participate in certain or a plurality of users' collaboration communication is a cooperation cell, and cooperation cell is illustrated with justifying in the drawings.Base station one, two, three is for needing collaboration user three optimum cooperative base station in the judgement of geographical position.But prior art is not considered the co-channel interference between the cooperation cell.And because hexagonal six fixed positions all are cooperation cell, the coordination between the cooperation cell also will produce contradiction.After a certain frequency band was used by a cooperation cell, adjacent cooperation cell just can not be used, and causes the waste of resource.
Therefore, prior art has proposed another kind of scheme, see also Fig. 3, the base station that participates in collaboration communication is 2 or 3, cooperation cell is by three kinds of different identifications, the numeral Customs Assigned Number on Cell 1 to Cell 7 expression base station 1-7, hexagon summit, different cooperation cell is used different frequency bands, and each cooperation cell is equipped with a central synergist.This scheme is divided into three parts to the frequency band of user collaboration, and adjacent cooperation cell is used different cooperation frequency bands, has effectively solved the coordination problem between the cooperation cell.The weak point of this scheme is, user near position between two cooperation cell can't obtain optimal service, for example, the user 6 of arrow indication can only participate in the service of cooperation cell 1, and its communication quality by base station 1,3,4 collaboration services is better certainly.Have, this scheme is also unfair to the processing of Cell Edge User again.Among the figure, be analytic target with sub-district 1, near the users its summit 1,3,5 can obtain better service, and the service relative mistake that near the users the summit 2,4,6 obtain some.
Therefore, provide a kind of multi-base station cooperative communication system and communication means thereof, can make each edge customer can both obtain the collaboration services of three base stations of fair optimum, become the problem that present technique field personnel need solve.
Summary of the invention
Technical scheme to be solved of the present invention provides a kind of multi-slot cooperative communication method for multiple base stations, to solve the deficiencies in the prior art.
For solving technique scheme, the invention provides a kind of multi-slot cooperative communication method for multiple base stations, it is characterized in that, may further comprise the steps:
Steps A, set in advance a different time-gap types of communication systems network topology structure that comprises several base stations, in the network topology structure of variant time slot type, the communication zone of each base station is divided into center and several sectors, edge, center separately, each base station has different communication bands respectively with each sector, edge, and the person is combined into different cooperation cell and the neighboring edge sector of different base station has the same frequency band in the different time-gap type;
Step B, each base station in many base station communications system is that the corresponding communication frequency band is distributed in separately center and each sector, edge according to set different time-gap types of communication systems network topology structure, to form different cooperation cell at different time-gap, make the user side that is in cooperation cell can obtain the multi-base station cooperative communication service, in the pairing communication zone in each base station, be provided with simultaneously one and be connected with base station in the communication zone of place, has described different time-gap types of communication systems network topology structure, and the user side that is used to pending multi-base station cooperative communication is selected the cooperation time slot type selecting device of communication time slot, with some central synergists that collaboration services are provided and are connected with associated each base station of the cooperation cell of providing service for the cooperation cell that forms in the different time-gap type are provided;
Step C, the user side of pending communication is set up communication linkage with single base station communication mode and corresponding access base station, to obtain the information of access base station, insert the channel condition information that comprises signal strength signal intensity of sector, it judges whether the communication service of needs multi-base station cooperative according to the signal strength signal intensity in the channel condition information of described access sector again, if, then it further receives the channel condition information that comprises signal strength signal intensity of each sector, edge of all base stations transmissions that can receive, and therefrom select the strongest M of signal strength signal intensity, and the request signal that request is carried out collaboration communication is together with described M peak signal edge sector number separately, and channel condition information is sent to the pairing cooperation time slot of described access base station type selecting device;
Step D, described cooperation time slot type selecting device are according to described different time-gap types of communication systems network topology structure and a described M channel condition information and corresponding edge sector number thereof, in the network topology structure of variant time slot type, select a cooperation cell respectively, calculate the signal to noise ratio of selected each cooperation cell that goes out again, and then select the pairing cooperation cell of signal to noise ratio the maximum as the best cooperation cell that communication service is provided for the user of described pending communication;
Step e, described cooperation time slot type selecting device with described best cooperation cell, and the residing communication time slot type information of described best cooperation cell send described access base station to, described access base station with described best cooperation cell, and the residing communication time slot type information of described best cooperation cell, and the user side information of described pending communication send the central synergist that most described best cooperation cell provides service;
Step F, described central synergist are distributed to the communication band of described best cooperation cell in the residing communication time slot type of described best cooperation cell according to described access base station, the user side of the described pending communication of cooperative scheduling, and scheduling result informed each coupled base station, each base station collaboration is dispatched the user side communication of described pending communication.
Preferable, among the step C, when the signal strength signal intensity in the channel condition information of described access sector needs the multi-base station cooperative communication service during less than β dBm, wherein, the β value preestablishes according to the disposal ability and the required quality of service requirement of user side of the load capacity of network, the central synergist that is equipped with.
Preferable, the M value preestablishes according to the disposal ability of the user side of described pending communication, the load capacity of based on feedback link.
Preferable, among the step D, in the network topology structure of variant time slot type, select the method for a cooperation cell to be respectively: to select the cooperation cell of described access sector under variant time slot type.
Preferable, among the step D, in the network topology structure of variant time slot type, select a cooperation cell method to be respectively: to select the cooperation cell of the user side of described pending communication at the place, the pairing sector of strong waveguide frequency signal that variant time slot type receives.
Preferable, among the step D, in the network topology structure of variant time slot type, select the method for a cooperation cell to be respectively: to select pairing each cooperation cell of the maximum in the signal to noise ratio of each sector, edge of described access base station when each cooperation cell at different time-gap type place is being communicated by letter.
Preferable, among the step D, in the network topology structure of variant time slot type, select the method for a cooperation cell to be respectively: pairing each cooperation cell of the maximum from the signal to noise ratio of sector, the pairing edge of a described M peak signal when formed all cooperation cell of variant time slot type are chosen in communication respectively.
Preferable, described time slot type comprises time slot type one and time slot type two.
Preferable, the computing formula of described signal to noise ratio is:
SINR comp ( x , y , z ) = ( G x + G y + G z ) P N 0 Δf + P · Σ j ∈ Ω G j ,
Wherein, x, y, z are the numbering of each sector, edge in the cooperation cell, and Ω is that (x, y z) have the intersection of numbering of the sector, edge of co-channel interference, N to described cooperation cell 0Be the power spectral density of Gauss's additive white noise, Δ f is a subcarrier spacing, and j is a sector number, and Gj is numbered the channel gain of the sector, edge of j to the user side of described pending communication, G x, G y, G zBe respectively cooperation cell (x, y, z) in each sector, edge to the channel gain of the user side of described pending communication, P is the transmitted power of each base station.
Beneficial effect of the present invention is: solved in the existing method some Cell Edge User and can not get optimum three problems that the base station is served simultaneously, effectively improved the communication quality of edge customer.
Description of drawings
Fig. 1 a is the single base station communication system communication of a prior art schematic diagram.
Fig. 2 is a prior art multi-base station cooperative communication system communication scheme.
Fig. 3 is that another prior art multi-base station cooperative communication system cooperation cell is divided schematic diagram.
Fig. 4 is that time slot type one cooperation cell and time slot type two cooperation cell of an embodiment are divided schematic diagram.
Fig. 5 is the time slot central authorities synergist placement location schematic diagram of the foregoing description.
Fig. 6 is the cumulative distribution function curve synoptic diagram of user's received signal Signal to Interference plus Noise Ratio among the embodiment.
Fig. 7 be in the foregoing description Capacity Ratio than curve synoptic diagram.
Embodiment
Multi-slot cooperative communication method for multiple base stations of the present invention may further comprise the steps at least:
Step 1, set in advance a different time-gap types of communication systems network topology structure that comprises several base stations, in the network topology structure of variant time slot type, the communication zone of each base station is divided into center and several sectors, edge, center separately, each base station has different communication bands respectively with each sector, edge, and the person is combined into different cooperation cell and the neighboring edge sector of different base station has the same frequency band in the different time-gap type.Usually, each base station is divided into two parts to whole available band, and wherein the cooperation frequency band of each sector, edge is divided into three equal parts, distributes to three sectors respectively.For example the bandwidth of α B (0≤α≤1) as the cooperation bandwidth, B is the bandwidth of whole network, if three parts the cooperation bandwidth be labeled as C 1, C 2, C 3, C then 1=C 2=C 3=(α B)/3.α is the parameter default according to network load condition, and the user side ratio that participates in collaboration communication in the high more network of α is many more, and the center uses the frequency band of (1-α) B to carry out single base station communication.As shown in Figure 4, in time slot type one communication system network topological structure, base station one to 19 is divided into center (promptly round inner region) and sector, 3 edges respectively, for example the communication zone of base station one is divided into round inner region and sector, edge 1,2, reaches 3, the communication zone of base station two is divided into round inner region and sector, edge 4,5, reaches 6, and the communication zone of base station three is divided into round inner region and sector, edge 7,8, reaches 9; The edge sector number of other base stations illustrates no longer one by one at this that as shown in Figure 4 wherein, base station one is placed on the center, and base station two to seven is by one arrangement around the base station of counterclockwise mode, and base station eight to base station 19 is by two to seven arrangements around the base station of counterclockwise mode; Wherein, in time slot type one, the sector, edge 1 of base station one, the sector, edge 6 of base station two, and the sector, edge 20 of base station seven be combined into a cooperation cell (1,6,20), the sector, edge 9 of the sector, edge 2 of base station one, base station three, and the sector, edge 10 of base station four be combined into a cooperation cell (2,9,10), other cooperation cell as shown in the figure, in this explanation no longer one by one; In time slot type two, the sector, edge 1 of base station one, the sector, edge 21 of base station seven, and the sector, edge 17 of base station six be combined into a cooperation cell (1,17,21), the sector, edge 2 of base station one, the sector, edge 7 of base station three, and the sector, edge 6 of base station two be combined into a cooperation cell (2,6,7), other cooperation cell as shown in the figure, in this explanation no longer one by one.Be noted that, base station one, eight, ten, 12,14,16, and the communication band of 18 these each centers, seven base stations and sector, edge in two time slot types, be identical, base station three, five, seven, nine, 13, and each sector, edge of 17 these six base stations are counterclockwise commentaries on classics 60 degree of time slot type one in the communication band of time slot type two, base station two, four, six, 11,15,19 these six base stations are clockwise commentaries on classics 60 degree of time slot type one in the communication band of time slot type two.
Step 2, each base station in many base station communications system is that the corresponding communication frequency band is distributed in separately center and each sector, edge according to set different time-gap types of communication systems network topology structure, to form different cooperation cell at different time-gap, make the user side that is in cooperation cell can obtain the multi-base station cooperative communication service, being provided with simultaneously one in the pairing communication zone in each base station is connected with base station in the communication zone of place, has described different time-gap types of communication systems network topology structure, and the user side that is used to pending multi-base station cooperative communication is selected the cooperation time slot type selecting device of communication time slot, with some central synergists that are respectively applied for to a cooperation cell provides collaboration services and each base station of being associated with the cooperation cell that coordination service is provided is connected, wherein, described cooperation time slot type selecting device can be integrated in the central synergist, also can be placed in the base station.See also Fig. 5 and (be simplicity of illustration, whole base stations are not drawn), the first central synergist that is provided with in base station one is a cooperation cell (1,6,20) service, corresponding, itself and base station one, base station two and base station seven connect by optical cable, and the second central synergist that is provided with in base station one is that cooperation cell (1,17,21) is corresponding, itself and base station one, base station six and base station seven connect by optical cable, two central synergists also are set respectively in other base stations, and each central synergist is a cooperation cell service, so in the present embodiment, have 19 base stations, be correspondingly provided with 38 central synergists, each central synergist is connected with three base stations by optical cable, controls the collaboration communication of user side in the corresponding cooperation cell.
Step 3, the user side of pending communication is set up communication linkage with single base station communication mode and corresponding access base station, to obtain the information of access base station, insert the channel condition information that comprises signal strength signal intensity of sector, it judges whether the communication service of needs multi-base station cooperative according to the signal strength signal intensity in the channel condition information of described access sector again, if, then it further receives the channel condition information that comprises signal strength signal intensity of each sector, edge of all base stations transmissions that can receive, and therefrom select the strongest M of signal strength signal intensity (generally comprise insert sector), and the request signal that request is carried out collaboration communication is together with separately edge sector number of a described M peak signal (sector, edge 1 of base station one for example, the sector, edge 6 of base station two, the sector, edge 20 of base station seven), and channel condition information is sent to the pairing cooperation time slot of described access base station type selecting device, by access base station described M the peak signal that the user side of pending communication is sent to is sent to the time slot type selecting device of cooperating usually.For example, if the user side of pending communication receives the frequency signal of center, show that then it is in the center, does not need the multi-base station cooperative communication service; If receive the frequency signal of the sector, edge 1 of base station one, and the intensity of this frequency signal is less than β dBm, show that then it is in the sector, edge, need the multi-base station cooperative communication service, wherein, the β value preestablishes according to the disposal ability and the required quality of service requirement of user side of the load capacity of network, the central synergist that is equipped with, and dBm is the unit of dBm.And the M value can preestablish according to the disposal ability of the user side of described pending communication, the load capacity of based on feedback link.
Step 4, described cooperation time slot type selecting device are according to described different time-gap types of communication systems network topology structure and a described M channel condition information and corresponding edge sector number thereof, in the network topology structure of variant time slot type, select a cooperation cell respectively, calculate the signal to noise ratio of selected each cooperation cell that goes out again, and then select the pairing cooperation cell of signal to noise ratio the maximum as the best cooperation cell that communication service is provided for the user side of described pending communication.In the network topology structure of variant time slot type, select the method for a cooperation cell to comprise following several respectively:
A. select the cooperation cell of described access sector under variant time slot type, for example, the access sector of the user side of described pending communication is the sector, edge 1 of base station one, then for the moment in the time slot type, sector, edge 1, sector, edge 6, sector, edge 20 form cooperation cell, then select cooperation cell (1,6,20); And when time slot type two, sector, edge 1, sector, edge 17, sector, edge 21 form cooperation cell, then select cooperation cell (1,17,21).From cooperation cell (1,6,20) and (1,17,21), select signal to noise ratio the maximum as optimum cooperation cell then.
B. select the cooperation cell of the user side of described pending communication at the place, the pairing sector of strong waveguide frequency signal that variant time slot type receives.
C. select pairing each cooperation cell of the maximum in the signal to noise ratio of each sector, edge of described access base station when each cooperation cell at different time-gap type place is being communicated by letter.For example, access base station one three cooperation cell (1,6,20) that time slot type one forms, (2,9,10), and (3,13,17) in select signal to noise ratio SINR CompThe maximum, again time slot type two formed three cooperation cell (1,17,21), (2,6,7), and (3,10,14) in select signal to noise ratio SINR CompThe maximum.
D. formed all cooperation cell of variant time slot type, be chosen in pairing each cooperation cell of the maximum in the signal to noise ratio in when communication respectively from sector, the pairing edge of a described M peak signal.For example, M is 54, and in the time slot type for the moment, traversal is calculated the signal to noise ratio SINR of all time slot type one cooperation cell that are made of sector, 57 edges Comp, the cooperation cell (1,6,20) of selecting the signal to noise ratio maximum is as the cooperation cell of selecting for the moment in the time slot type; When time slot type two, traversal is calculated the signal to noise ratio SINR of all time slot type two cooperation cell that are made of sector, 57 edges Comp, the cooperation cell (2,6,7) of selecting the signal to noise ratio maximum is as the cooperation cell of selecting when time slot type two.
The computational methods of aforementioned each signal to noise ratio of mentioning are:
SINR comp ( x , y , z ) = ( G x + G y + G z ) P N 0 Δf + P · Σ j ∈ Ω G j ,
Wherein, x, y, z are the numbering of each sector, edge in the cooperation cell, and Ω is that (x, y z) have the intersection of numbering of the sector, edge of co-channel interference, N to described cooperation cell 0Be the power spectral density of Gauss's additive white noise, Δ f is a subcarrier spacing, and j is a sector number, and Gj is numbered the channel gain of the sector, edge of j to the user side of described pending communication, G x, G y, G zBe respectively cooperation cell (x, y, z) in each sector, edge to the channel gain of the user side of described pending communication, P is the transmitted power of each base station.The communication of the cooperation cell (1,6,20) that forms with time slot type one is example:
SINR comp ( 1 , 6 , 20 ) = ( G 1 + G 6 + G 20 ) P N 0 Δf + P · Σ j ∈ Ω G j ,
Wherein, Ω={ 8,12,14,18,22,26,28,33,34,38,40,45,46,50,52,57} is the sector that cooperation cell (1,6,20) is had co-channel interference.
Step 5, described cooperation time slot type selecting device with described best cooperation cell, and the residing communication time slot type information of described best cooperation cell send described access base station to, described access base station with described best cooperation cell, and the residing communication time slot type information of described best cooperation cell, and the user side information of described pending communication transmit the central synergist that most described best cooperation cell provides service.For example described best cooperation cell is that corresponding its residing communication time slot information of cooperation cell (1,6,20) is time slot type one, and then each information is sent to the first central synergist of base station one.
The first central synergist of step 6, base station one according to base station one in described best cooperation cell (1,6,20) residing time slot type one is distributed to described cooperation cell (1,6,20) communication band, the user side of the described pending communication of cooperative scheduling, and scheduling result informed coupled base station one, two and seven, the user side communication of base station one, two and the described pending communication of seven cooperative schedulings.Concrete scheduling result is relevant with concrete cooperation scheme.
Time slot type one described in the present embodiment and time slot type two can be strange time slot and even time slot, also whole time slot can be divided into several time slot sections, be numbered 1,2,3...m ... n, selecting to be numbered 1 to m time slot is time slot type one, the time slot that is numbered m+1 to n is a time slot type two.
The simulation parameter of employing table one carries out emulation to multi-slot base station collaboration communication system of the present invention, and its simulation result such as Fig. 6 are to shown in Figure 7.
Table one:
Figure GSB00000996648900091
As Fig. 6 and Fig. 7, the Signal to Interference plus Noise Ratio among Fig. 6 is signal to noise ratio, capacity C=log2 (1+SINR among Fig. 7 Comp).Can see, of the present invention to the collaboration communication scheme of multi-base station cooperative communication plan than non-collaboration communication scheme and prior art, have better communication efficiency.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only.Any modification or partial replacement that does not break away from spirit and scope of the invention all should be encompassed in the middle of the claim scope of the present invention.

Claims (4)

1. a multi-slot cooperative communication method for multiple base stations is characterized in that, may further comprise the steps:
Steps A, set in advance a different time-gap types of communication systems network topology structure that comprises several base stations, in the network topology structure of variant time slot type, the communication zone of each base station is divided into center and several sectors, edge, center separately, each base station has different communication bands respectively with each sector, edge, and the person is combined into different cooperation cell and the neighboring edge sector of different base station has the same frequency band in the different time-gap type;
Step B, each base station in many base station communications system is that the corresponding communication frequency band is distributed in separately center and each sector, edge according to set different time-gap types of communication systems network topology structure, to form different cooperation cell at different time-gap, make the user side that is in cooperation cell can obtain the multi-base station cooperative communication service, in the pairing communication zone in each base station, be provided with simultaneously one and be connected with base station in the communication zone of place, has described different time-gap types of communication systems network topology structure, and the user side that is used to pending multi-base station cooperative communication is selected the cooperation time slot type selecting device of communication time slot, with some central synergists that collaboration services are provided and are connected with associated each base station of the cooperation cell of providing service for the cooperation cell that forms in the different time-gap type are provided;
Step C, the user side of pending communication is set up communication linkage with single base station communication mode and corresponding access base station, to obtain the information of access base station, insert the channel condition information that comprises signal strength signal intensity of sector, it judges whether the communication service of needs multi-base station cooperative according to the signal strength signal intensity in the channel condition information of described access sector again, if, then it further receives the channel condition information that comprises signal strength signal intensity of all base stations transmissions that can receive, and therefrom select the strongest M of signal strength signal intensity, and the request signal that request is carried out collaboration communication is together with described M peak signal edge sector number separately, and channel condition information is sent to the pairing cooperation time slot of described access base station type selecting device, wherein, the M value is according to the disposal ability of the user side of described pending communication, the load capacity of based on feedback link preestablishes;
Step D, described cooperation time slot type selecting device are according to described different time-gap types of communication systems network topology structure and a described M channel condition information and corresponding edge sector number thereof, in the network topology structure of variant time slot type, select a cooperation cell respectively, calculate the signal to noise ratio of selected each cooperation cell that goes out again, and then select the pairing cooperation cell of signal to noise ratio the maximum as the best cooperation cell that communication service is provided for the user of described pending communication; Wherein, in the network topology structure of variant time slot type, select the method for a cooperation cell to comprise respectively:
A. select the cooperation cell of described access sector under variant time slot type;
B. select the cooperation cell of the user side of described pending communication at the place, the pairing sector of strong waveguide frequency signal that variant time slot type receives;
C. select pairing each cooperation cell of the maximum in the signal to noise ratio of each sector, edge of described access base station when each cooperation cell at different time-gap type place is being communicated by letter;
D. formed all cooperation cell of variant time slot type, be chosen in pairing each cooperation cell of the maximum in the signal to noise ratio in when communication respectively from sector, the pairing edge of a described M peak signal;
Step e, described cooperation time slot type selecting device with described best cooperation cell, and the residing communication time slot type information of described best cooperation cell send described access base station to, described access base station with described best cooperation cell, and the residing communication time slot type information of described best cooperation cell, and the user side information of described pending communication send the central synergist that most described best cooperation cell provides service;
Step F, described central synergist are distributed to the communication band of described best cooperation cell in the residing communication time slot type of described best cooperation cell according to described access base station, the user side of the described pending communication of cooperative scheduling, and scheduling result informed each coupled base station, each base station collaboration is dispatched the user side communication of described pending communication.
2. multi-slot cooperative communication method for multiple base stations as claimed in claim 1, it is characterized in that: among the step C, when the signal strength signal intensity in the channel condition information of described access sector needs the multi-base station cooperative communication service during less than β dBm, wherein, the β value preestablishes according to the disposal ability and the required quality of service requirement of user side of the load capacity of network, the central synergist that is equipped with.
3. multi-slot cooperative communication method for multiple base stations as claimed in claim 1, it is characterized in that: described time slot type comprises time slot type one and time slot type two, wherein, base station one to base station 19 is divided into center and sector, 3 edges respectively in the different time-gap type, base station one is divided into center and sector, edge 1,2, reaches 3, base station two is divided into center and sector, edge 4,5, and 6 and analogize, and base station 19 is divided into center and sector, edge 55,56, and 57; Wherein, base station one is placed on the center, and base station two to seven is by one arrangement around the base station of counterclockwise mode, and base station eight to base station 19 is by two to seven arrangements around the base station of counterclockwise mode; In time slot type one, the sector, edge 1 of base station one, the sector, edge 6 of base station two, and the sector, edge 20 of base station seven be combined into a cooperation cell, the sector, edge 2 of base station one, the sector, edge 9 of base station three, and the sector, edge 10 of base station four be combined into a cooperation cell; In time slot type two, the sector, edge 1 of base station one, the sector, edge 21 of base station seven, and the sector, edge 17 of base station six be combined into a cooperation cell, the sector, edge 2 of base station one, the sector, edge 7 of base station three, and the sector, edge 6 of base station two be combined into a cooperation cell, the neighboring edge sector of analogizing different base station has the same frequency band in the different time-gap type, and the person is combined into different cooperation cell; Wherein, base station one, eight, ten, 12,14,16, and 18 center and the communication band of sector, edge in two time slot types, be identical, base station three, five, seven, nine, each sector, edge of 13 and 17 are counterclockwise commentaries on classics 60 degree of time slot type one in the communication band of time slot type two, and base station 24, six, 11,15,19 communication bands in time slot type two are clockwise commentaries on classics 60 degree of time slot type one.
4. multi-slot cooperative communication method for multiple base stations as claimed in claim 1 is characterized in that, the computing formula of described signal to noise ratio is:
SINR comp ( x , y , z ) = ( G x + G y + G z ) P N 0 Δf + P · Σ j ∈ Ω G j ,
Wherein, x, y, z are the numbering of each sector, edge in the cooperation cell, and Ω is that (x, y z) have the intersection of numbering of the sector, edge of co-channel interference, N to described cooperation cell 0Be the power spectral density of Gauss's additive white noise, Δ f is a subcarrier spacing, and j is a sector number, and Gj is numbered the channel gain of the sector, edge of j to the user side of described pending communication, G x, G y, G zBe respectively cooperation cell (x, y, z) in each sector, edge to the channel gain of the user side of described pending communication, P is the transmitted power of each base station.
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