CN101895940B - Method for distributing resources between main service cell and coordinate cells - Google Patents
Method for distributing resources between main service cell and coordinate cells Download PDFInfo
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Abstract
The invention relates to a technique for realizing coordinate multipoint communication, in particular to a method for coordinating resource distribution between a main service cell and coordinate cells in a wireless cellular network. The method comprises that: user equipment receives reference signals sent by a plurality of cell base stations and selects a main service cell base station and coordinate cell base stations; according to the service rate requirement of the user equipment and feedback channel parameters, the main service cell base station negotiates with the coordinate cell base stations to select a transmission channel; and the main service cell base station negotiates with the coordinate cells to distribute coordination power for performing multipoint coordinate transmission. In the invention, based on the conventional cellular network architecture, computing complexity and signaling interaction amount are lowered by a method for optimizing negotiation by the direct negotiation between the main service cell base station and the coordinate cell base stations. Thus, limited frequency spectrum resources and power resources are used fully, interference is avoided effectively and the service quality at cell edges is improved.
Description
Technical field
The present invention relates to a kind of realization coordinate multipoint communication technology, relate in particular to the method that resource is distributed between the main Serving cell that is applicable under the wireless cellular network and the cooperation cell.
Background technology
The commercial wireless carriers of the overwhelming majority all is to have adopted cellular network architecture now.Cellular network architecture has availability of frequency spectrum height, strong adaptability, the characteristics of favorable expandability.But because the design feature of cellular network itself, in cell edge, it is low to exist useful signal intensity, the shortcoming that interference power is large.Therefore, the network service quality that how to promote cell edge is a hot issue of current wireless Communication Development.
Coordinate multipoint communication (Coordinated Multi-point, CoMP) technology is that 3GPP is organized in the key technology point that LTE-A plan the inside proposes.The basic principle of the coordinate multipoint communication technology as shown in Figure 1, in a plurality of cell base station C1, C2, the C3, have central user equipment UE 3, UE4 and edge customer equipment UE 1, UE2, wherein edge customer equipment UE 1, UE2 disturb stronger, by the interference of combined dispatching reduction to Cell Edge User equipment, perhaps by the mode of joint transmission, improve further the received power of Cell Edge User equipment, thereby improve the impression of Cell Edge User equipment.This technology is by the mutual cooperation between the base station, between subscriber equipment, between base station and via node, between subscriber equipment and via node, solved the minimum antenna configuration problem of minizone co-channel interference and subscriber terminal equipment, can effectively improve performance and the sector throughput of Cell Edge User equipment, not bring larger complexity to promote to terminal equipment simultaneously.
But, although gathering around, the coordinate multipoint communication technology has broad application prospects, its technology itself still exists problems and needs to be resolved hurrily.At present, at the early-stage about the research of the coordinate multipoint communication technology both at home and abroad, do not form complete theoretical system, and more do not further investigate for many key technical problems of coordinate multipoint communication.
Because the introducing of the coordinate multipoint communication technology will change the network topology structure of traditional cellular communication system, originally single centralized network configuration will be to the centralized and distributed network configuration development that combines.Traditional coordinate multipoint communication is based on the center framework, need to there be a Centroid to collect simultaneously the relevant information of main base station in service sector and cooperation cell base station, such as channel condition, therefore minimum power vector etc., to transmit the Internet Transmission expense that these information bring to Centroid very heavy main base station in service sector and cooperation cell base station.
In addition, Centroid in traditional coordinate multipoint communication technology is at the channel condition that receives main base station in service sector and cooperation cell base station, after the relevant informations such as minimum power vector, what adopt is each collaboration power of selecting, the effectiveness of iterative computation master's Serving cell promotes and cooperation cell effectiveness reduces, choose the poor of the two, as only collaboration power.And do not consider to compensate effectiveness whether greater than the sacrifice effectiveness of cooperation cell.
Therefore, the solution of traditional collaboration communication based on the centralized network configuration, although feasible in theory, because its complexity can realize in practice hardly.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, provides feasible in a kind of practice, and the complexity of calculating is low, and the interactive quantity of signaling is few, and the result approaches the method that resource is distributed between optimum main Serving cell and the cooperation cell.
The present invention solves the technical scheme that its technical problem takes: the method that resource is distributed between a kind of main Serving cell and the cooperation cell, comprise the steps,
Subscriber equipment receives the reference signal that a plurality of cell base stations send, and selects main base station in service sector and cooperation cell base station;
Described main base station in service sector with described cooperation cell base station negotiate, is selected transmission channel according to the service rate needs of subscriber equipment and the channel parameter of feedback;
Described main base station in service sector and described cooperation cell base station negotiate distribute collaboration power to carry out coordinated multipoint transmission, further comprise,
For the described transmission channel of selecting distributes minimum power, the collaboration power scope that can provide is provided according to dump power main base station in service sector in described cooperation cell base station on the basis of satisfying the minimum power requirement;
The collaboration power of described cooperation cell base station increases progressively a power at every turn and estimates the sampling interval, and iterative computation cooperation cell base station is owing to the user utility and the patient factor that provide cooperation transmission power to reduce for main base station in service sector;
Described main base station in service sector adopts identical described power to estimate the sampling interval, utility function and the patient factor that the described main base station in service sector of iterative computation promotes;
Described main base station in service sector is after having obtained the patient factor that both sides obtain after each sampling interval, calculating the effectiveness of main Serving cell and cooperation cell divides proportional, calculate when main base station in service sector is got maximum utility the compensation effectiveness that the cooperation cell base station can access;
After described cooperation cell base station receives described compensation effectiveness, greater than the user utility of described reduction, then carry out coordinate multipoint communication according to current collaboration power if judge compensation effectiveness.
Described subscriber equipment receives the reference signal that a plurality of cell base stations send, and selects the step of main base station in service sector and cooperation cell base station, can further comprise,
The reference signal that subscriber equipment sends by receiving a plurality of cell base stations, obtain channel parameter and Signal to Interference plus Noise Ratio between different districts base station and the described subscriber equipment, selecting one is main base station in service sector, and the channel parameter of each cell base station that will collect again and letter are disturbed and made an uproar than feeding back to described main base station in service sector;
Described main base station in service sector is according to Signal to Interference plus Noise Ratio (the Signal to Interference plus Noise Ratio of subscriber equipment feedback, SINR), judge when subscriber equipment is edge customer equipment, select a cell base station in remaining cell base station as the cooperation cell base station.
The present invention is under based on existing cellular network architecture, directly hold consultation by main base station in service sector and cooperation cell base station, optimize the method for consulting, reduce the complexity of calculating and the interactive quantity of signaling, thereby take full advantage of limited frequency spectrum resource and power resource, effectively avoid interference, improve the service quality of cell edge.In addition, by taking into full account compensation effectiveness, when the effectiveness that described compensation effectiveness is sacrificed greater than cooperation cell, can realize the maximization of both sides' effectiveness, and the complexity of negotiation algorithm is low, need mutual signaling data few between main base station in service sector and the cooperation cell base station, realize the compromise of optimization and feasibility.
Description of drawings
Fig. 1 is the schematic diagram of the coordinate multipoint communication technology;
Fig. 2 is for adopting the inventive method to realize the flow chart of coordinate multipoint communication.
Embodiment
Below in conjunction with Fig. 1 content of the present invention is described in detail.As shown in Figure 2, be the method that resource between the main Serving cell among employing the present invention and the cooperation cell is distributed, realize the flow chart of coordinate multipoint communication.
Step 1: user equipment (UE) 1, UE2, UE3, UE4 are by receiving the reference signal of a plurality of cell base station C1, C2, C3 transmission, obtain channel parameter and signal and interference and noise ratio (Signal to Interference plus Noise Ratio between different districts base station and the described subscriber equipment, SINR, be called for short Signal to Interference plus Noise Ratio), selecting one is main base station in service sector.Take Fig. 1 as example, user equipment (UE) 1, UE4, channel performance by each cell base station of obtaining is compared, select the residential quarter at cell base station C2 place as main Serving cell, the channel parameter that each cell base station that will collect is again sent and SINR feed back to described main base station in service sector C2, in like manner, it is main Serving cell that user equipment (UE) 3 is selected the residential quarter at cell base station C1 places, and the channel parameter of each cell base station that will collect and SINR feed back to described main base station in service sector C1; It is main Serving cell that user equipment (UE) 2 is selected the residential quarter at cell base station C3 places, and the channel parameter of each cell base station that will collect and SINR feed back to described main base station in service sector C3.
Step 2: described main base station in service sector C2 judges according to the SINR of subscriber equipment feedback whether subscriber equipment belongs to edge customer equipment or central user equipment.If edge customer equipment just selects to adopt the coordinate multipoint communication mode.Among Fig. 1, user equipment (UE) 4 is the central user equipment of main base station in service sector C2, user equipment (UE) 3 is the central user equipment of main base station in service sector C1, user equipment (UE) 1 is the edge customer equipment of main base station in service sector C2, and user equipment (UE) 2 is the edge customer equipment of main base station in service sector C3.Channel parameter and SINR that main Serving cell C2 detects according to described edge customer equipment UE 1, a residential quarter in the residential quarter of selection except the described main Serving cell at place is as its cooperation cell, and namely selecting cell base station C1 is the cooperation cell base station; In like manner, described edge customer equipment UE 2 selects cell base station C2 as the cooperation cell base station.
Judge subscriber equipment whether belong to edge customer equipment can but be not limited to adopt following method.
Select a threshold value SINR_threshold, if the SINR of subscriber equipment greater than SINR_threshold, then it belongs to central user equipment, otherwise belongs to edge customer equipment.
Select cooperation cell method can but be not limited to be, in the residential quarter except the described main Serving cell at place, the best residential quarter of channel performance that subscriber equipment feeds back.
Step 3: main base station in service sector is according to the service rate needs of subscriber equipment and the channel parameter of feedback, for it selects suitable transmission channel.
The frequency band that described central user equipment UE 3 is used is determined separately by main base station in service sector C2.Because being that the edge customer equipment of a plurality of cooperation cell collection is common, uses by the frequency band that edge customer equipment UE 1 is used.So, for an edge customer equipment UE 1, the ID that supposes his main base station in service sector C2 is k, the ID of the cooperation cell base station C1 that selects is l, his main base station in service sector C2 need to consult be the channel frequency resource that user equipment (UE) 1 provides with cooperation cell base station C1, selects one all not have occupied channel at each cell base station.The below is described in detail the coordination approach that resource between main Serving cell and the cooperation cell is distributed only take edge customer equipment UE 1, main base station in service sector C2, cooperation cell base station C1 as example.
Step 4: according to the channel parameter of user equipment (UE) 1 feedback, main base station in service sector C2 obtains the minimum power requirement of 1 pair of signal transmission of described user equipment (UE), then giving on the basis of satisfying the minimum power requirement as user equipment (UE) 1 and consult the channel allocation minimum power that distributes, also is simultaneously every other edge customer equipment among the current main base station in service sector C2 and each channel allocation minimum power of central user hold facility.Meanwhile, after cooperation cell base station C1 gives this residential quarter all edge customer equipment and the complete minimum power of central user devices allocation as main Serving cell, obtain the collaboration power scope that can provide according to dump power.According to same method, cell base station C2 also obtains the scope of the collaboration power that it can provide.
The method of calculating the minimum power condition can adopt following formula to calculate
Give each channel allocation power method can but be not limited to adopt following water-filling algorithm.
Provide collaboration power feasible region computational methods can but be not limited to adopt, minimum value gets zero, maximum is got the poor of gross power and the power that distributes.
Step 5: after the frequency resource that provides to user equipment (UE) 1 has been provided for cooperation cell base station C1 and main base station in service sector C2, in the feasible collaboration power scope that in step 4, obtains, select a suitable collaboration power to estimate the sampling interval (hereinafter to be referred as the sampling interval).The selection of described collaboration power increases progressively a sampling interval since a minimum value at every turn, then, re-starts power division with remaining power.Wherein, the minimum value of described sampling interval and collaboration power can preset, and the minimum value of described collaboration power can be set as 0.Described power division adopts the method identical with step 4.Then, when increasing progressively a sampling interval, iterative computation cooperation cell base station C1 is because for main base station in service sector C2 provides cooperation transmission power at every turn, and the user utility function that reduces (be called and sacrifice effectiveness) and the patient factor.
Described cooperation cell base station C1 passes to main base station in service sector C2 with the patient factor calculated and feasible collaboration power scope after whole feasible collaboration power scope inner iteration has been calculated.
The user utility function
Refer to that subscriber equipment is used for that through-put power increases or reduces and lifting or the reduction of the QoS of customer that brings, computational methods can but be not limited to adopt following formula to calculate.
The patient factor delta of cooperation cell
Slaving(t) refer to that cooperation cell is to sacrificing the TL of effectiveness.Computational methods can but be not limited to adopt following formula to calculate.
Step 6: after main base station in service sector C2 receives feasible collaboration power scope, adopt the power identical with cooperation cell base station C1 to estimate the sampling interval.The collaboration power that iterative computation provides owing to cooperation cell base station C1, main base station in service sector C2 can be the transmitting power that edge customer equipment UE 1 reduces.This part corresponding power is reused in main base station in service sector C2, carries out power division, the lifting of the user utility function that can bring.Then, during corresponding to each sampling interval, calculate each user utility function and patient factor that promotes.
User's utility function
Adopt the computational methods identical with step 5.
The patient factor delta of main Serving cell
Serving(t) refer to main Serving cell to promoting the serious hope degree of effectiveness, computational methods can but be not limited to adopt following formula to calculate.
Step 7: main base station in service sector C2 divides proportional according to consulting to be divided into the effectiveness of calculating main Serving cell and cooperation cell obtained the patient factor that both sides obtain after each sampling interval after.Calculate the maximum of the effectiveness that main base station in service sector C2 can get according to minute proportional and user utility, then, calculate when main base station in service sector C2 divide during maximum utility, the compensation effectiveness that cooperation cell base station C1 can access.Main base station in service sector C2 sends to cooperation cell base station C1 with the compensation effectiveness information that cooperation cell base station C1 can access.
The effectiveness of calculating main base station in service sector C2 and cooperation cell base station C1 divide proportional can but be not limited to adopt following formula to calculate.
Then according to following formula, the effectiveness after each sampling interval is divided into, obtain described main base station in service sector C2 divide the maximum of effectiveness.
The compensation effectiveness of described cooperation cell base station C1 can but be not limited to adopt following formula to calculate
Step 8: after cooperation cell base station C1 receives described compensation effectiveness, judge that whether compensation effectiveness m is greater than the user utility that reduces, namely in step 5, corresponding to main base station in service sector C2 divide the maximum of effectiveness the time, the user utility that the collaboration power of cooperation cell base station reduces.If greater than, then this coordinate multipoint communication request success, cooperation is carried out coordinate multipoint according to the power of agreement with frequency band and is communicated by letter, otherwise just this time cooperation request of refusal.Cooperation cell base station C1 feeds back to main base station in service sector C2 with request results.
Step 9: main base station in service sector C2 receives the request results of feedback.If request results success, then with cooperation cell base station C1 on the frequency band that consults and power resource, for subscriber equipment provides the coordinate multipoint collaboration communication.If unsuccessful, it is constant then to keep original transmission means.
More than method that resource between main Serving cell provided by the present invention and the cooperation cell is distributed be described in detail, used specific case herein 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, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (2)
1. the method that resource is distributed between a main Serving cell and the cooperation cell is characterized in that: comprises the steps,
Subscriber equipment receives the reference signal that a plurality of cell base stations send, and selects main base station in service sector and cooperation cell base station;
Described main base station in service sector with described cooperation cell base station negotiate, is selected transmission channel according to the service rate needs of subscriber equipment and the channel parameter of feedback;
Described main base station in service sector and described cooperation cell base station negotiate distribute collaboration power to carry out coordinated multipoint transmission, further comprise,
For the described transmission channel of selecting distributes minimum power, the collaboration power scope that can provide is provided according to dump power main base station in service sector in described cooperation cell base station on the basis of satisfying the minimum power requirement;
The collaboration power of described cooperation cell base station increases progressively a power at every turn and estimates the sampling interval, and iterative computation cooperation cell base station is owing to the user utility and the patient factor that provide cooperation transmission power to reduce for main base station in service sector;
Described main base station in service sector adopts identical described power to estimate the sampling interval, utility function and the patient factor that the described main base station in service sector of iterative computation promotes;
Described main base station in service sector is after having obtained the patient factor that both sides obtain after each sampling interval, calculating the effectiveness of main Serving cell and cooperation cell divides proportional, calculate when main base station in service sector is got maximum utility the compensation effectiveness that the cooperation cell base station can access;
After described cooperation cell base station receives described compensation effectiveness, greater than the user utility of described reduction, then carry out coordinate multipoint communication according to current collaboration power if judge compensation effectiveness;
Wherein, described utility function represents that subscriber equipment is used for that through-put power increases or reduces and lifting or the reduction of the QoS of customer that brings, the TL that the patient factor representation cooperation cell of described cooperation cell reduces effectiveness, the serious hope degree that the patient factor representation master Serving cell of described main Serving cell promotes effectiveness; Minute proportional distribution for the expression user utility of the described patient factor further represents the distribution of power.
2. the method that resource is distributed between main Serving cell according to claim 1 and the cooperation cell, it is characterized in that: described subscriber equipment receives the reference signal that a plurality of cell base stations send, select the step of main base station in service sector and cooperation cell base station, further comprise
The reference signal that subscriber equipment sends by receiving a plurality of cell base stations, obtain channel parameter and Signal to Interference plus Noise Ratio between different districts base station and the described subscriber equipment, selecting one is main base station in service sector, and the channel parameter of each cell base station that will collect again and letter are disturbed and made an uproar than feeding back to described main base station in service sector;
Described main base station in service sector is disturbed the ratio of making an uproar according to the letter of subscriber equipment feedback, judges when subscriber equipment is edge customer equipment, selects a cell base station in remaining cell base station as the cooperation cell base station.
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| CN102026388B (en) * | 2011-01-07 | 2013-07-31 | 西安电子科技大学 | Method for allocating radio resources under coordinated multipoint transmission/reception (CoMP) in long term evolution-advanced (LTE-A) system |
| CN102625357A (en) * | 2011-02-01 | 2012-08-01 | 中兴通讯股份有限公司 | CoMP-based admission control method and base station |
| CN102625356B (en) * | 2011-02-01 | 2017-11-03 | 中兴通讯股份有限公司 | A kind of terminal based on CoMP accesses the method and system of multiple cell |
| CN102638898A (en) * | 2011-02-11 | 2012-08-15 | 中兴通讯股份有限公司 | Centralized-type wired port data transmission method and system based on coordinated multiple points |
| CN102761912B (en) * | 2011-04-27 | 2017-05-03 | 中兴通讯股份有限公司 | Method and system for selecting coordination district from CoMP |
| CN102802194B (en) * | 2011-05-23 | 2017-09-05 | 中兴通讯股份有限公司 | A kind of eat dishes without rice or wine jamming control method and system based on CoMP |
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| CN102932931B (en) * | 2011-08-11 | 2019-02-26 | 中兴通讯股份有限公司 | Base station coordination method and device |
| CN103312402B (en) * | 2012-03-16 | 2016-08-10 | 中国移动通信集团公司 | Data transmission method, user terminal and the community that dynamic cell selects |
| WO2014094276A1 (en) * | 2012-12-20 | 2014-06-26 | 华为技术有限公司 | Method and device for interacting data of user in the edge region of cloud radio access network |
| CN103905346B (en) * | 2012-12-28 | 2017-11-17 | 华为技术有限公司 | A kind of method and apparatus of interference signal processing |
| WO2014101243A1 (en) * | 2012-12-31 | 2014-07-03 | 华为技术有限公司 | Load balancing method and network control node |
| CN103828422A (en) * | 2012-12-31 | 2014-05-28 | 华为技术有限公司 | Method for balancing load and network control node |
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