CN105827286A - Game theory-based CoMP system and method - Google Patents
Game theory-based CoMP system and method Download PDFInfo
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- CN105827286A CN105827286A CN201610046210.3A CN201610046210A CN105827286A CN 105827286 A CN105827286 A CN 105827286A CN 201610046210 A CN201610046210 A CN 201610046210A CN 105827286 A CN105827286 A CN 105827286A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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Abstract
The invention discloses a game theory-based CoMP system and a method. The system comprises a user detection module and a collaboration set selection module. The user detection module is used for analyzing the position information of a user. The data of the information can be uploaded via a handset and other network equipment. After the position information of the user relative to a base station, the signal intensity at the position of the user, and the surrounding interference situation are obtained, the generated information is collected and simultaneously sent to the collaboration set selection module. The collaboration set selection module receives the information transmitted from the user detection module, calculates the signal-to-interference ratio of the user, the interruption probability and the throughput of an entire cell, dynamically considers whether the user needs to be collaborated or not and finally generates a cooperative scheme after comparing the distance between the user and the base station with the conditions of base stations in surrounding cells. Therefore, on the condition that the throughput reaches a certain value, the load loss of the system is reduced. Meanwhile, the spirit of the CoMP system is realized, and the performance of the CoMP system is improved.
Description
Technical field
The present invention relates to CoMP system based on theory of games and method, belong to communication technical field.
Background technology
In next generation mobile communication system, decline and disturb two key challenge being to face.In order to realize at a high speed, reliable data are transmitted, the spectrum efficiency of raising system, coordinate multipoint communication (is called for short CoMP, CoordinatedMultiplePointsTransmission/Reception) as multiple-input and multiple-output (MIMO, MultipleInputMultipleOutput) expansion technique of technology, it is one of technology solving forth generation mobile communication system high request, is considered simultaneously as improving high data rate coverage and improving a kind of instrument of cell edge throughput.The income brought due to CoMP system is with system load loss as cost, more cooperative base station can not only bring bigger power system capacity, also mean that the increase to system load loss, in order to the unilateral large-scale cooperation scale that adds that improves of capacity often loses more than gain.Therefore, it is necessary to collaboration set scale is carried out overall planning in the case of considering power system capacity and system loading at the same time.And the present invention can solve problem above well.
Summary of the invention
Present invention aim at solving above-mentioned the deficiencies in the prior art, propose a kind of CoMP system based on theory of games and method, the present invention is that the method for the Nash equilibrium from total linearization is started with, game has been carried out between power system capacity and system load are lost, decrease the load loss of system, improve CoMP system performance.
The technical solution adopted for the present invention to solve the technical problems is: a kind of CoMP system based on theory of games, and this system includes that user's detection module and collaboration set choose module.
User's detection module is used for analyzing user's location information, the data of this information can be uploaded by network equipments such as mobile phones, draw the positional information of user distance base station, the signal intensity of present position and around the information such as disturbed condition after, the information of generation is collected, and mails to collaboration set simultaneously and choose module.
Collaboration set chooses the information that module accepts to send from user's detection module, calculate the signal interference ratio of user, outage probability and the handling capacity in whole cell (i.e. community), after the distance of cell base station and the situation of base station, peripheral cell residing for contrast user distance, dynamically consider user's generation the need of the scheme that carries out cooperating and finally cooperate.
The function of choosing of present system collaboration set focuses on user's detection module and collaboration set chooses module, the position of user is drawn by user's detection module, signal intensity, information such as disturbed condition and be transferred to collaboration set and choose module, collaboration set generation module is by the information transmitted, decide whether to cooperate by algorithm, if carried out cooperation, choose which collaboration set effect best.
Present invention also offers the method for designing of a kind of CoMP system based on theory of games, the method comprises the steps:
Step 1: the ergodic capacity of community is divided into two parts, i.e. non-cooperating district and coordinated regions.Ergodic capacity is calculated according to Shannon momentary output.Non-cooperating district with the computational methods of coordinated regions is:
WhereinWithFor non-cooperating district and coordinated regions momentary output, r is the radius size in non-cooperating district, and R is whole cell size.F (ρ, θ) is the probability density function of service area.
Step 2: system load calculates
In the MIMO downlink transfer of FDD, the pilot frequency sequence that user is sent by base station estimates correlated channels, and by feedback of channel information to base station, base station must keep transmission until it is able to receive that the channel information of all users, thus can cause the delay that data are transmitted, and described method devises clean handling capacity for representing this loss, it may be assumed that
Definition modifying factor α is
Wherein, NfIt is the number of bits of feedback of all users, NIIt is the additional bit identifying user, TfIt it is bit transmission time.
Step 3: coupling system capacity and system load, the utility function of foundation, it may be assumed that
Step 4: design game theoretical model
By cooperative base station quantity McChanging as independent variable, the strategy in game theoretical model with cooperation radius r, game theoretical model includes:
1) participant is: power system capacity and system load loss, N={1,2}；
2) policy space is: ζiWhereinMcFor cooperative base station quantity, r is cooperation radius；
3) revenue function, it may be assumed that
The calculating of step 5:Nash equilibrium solution
If the Nash equilibrium of continuous strategy game, as long as revenue function uiC () is continuous print, just can by the method seeking extreme value obtain each participant i for other participant-i whole strategy most preferably reflect function. and participant reflection function focus must be just Nash equalize, therefore, for the calculating of the Nash equilibrium solution of this problem, can sum up in the point that for revenue function U (Mc) extreme value calculate.
The state traversals capacity of collaboration user is through being reduced to:
In non-cooperating region, the ergodic capacity of user is through being reduced to:
Use control variate method to McWith r derivation respectively, draw the utility function relation with both.
Beneficial effect:
1, the present invention is the CoMP system design of collaboration set scale selection based on theory of games, and this system in the case of reaching certain handling capacity, decreases the load loss of system, meets CoMP system objective, improves CoMP system performance.
2, the present invention can be applied not only to forth generation mobile communication, and can be applicable to five generation communication technologys, meets the requirement of green communications.
3, in the case of the present invention considers power system capacity and system loading at the same time, it is possible to collaboration set scale is planned as a whole well and designs.
Accompanying drawing explanation
Fig. 1 is the structural representation of present system.
Fig. 2 is user's detection module functional diagram of present system.
The collaboration set of Fig. 3 present system chooses the functional diagram of module
Fig. 4 is the betting model workflow diagram of the present invention.
Fig. 5 is the method flow diagram of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, the invention is described in further detail.
As it is shown in figure 1, the invention provides a kind of CoMP system based on theory of games, this system includes that user's detection module and collaboration set choose module.
User's detection module is used for analyzing user's location information, the data of this information can be uploaded by network equipments such as mobile phones, draw the positional information of user distance base station, the signal intensity of present position and around the information such as disturbed condition after, the information of generation is collected, and mails to collaboration set simultaneously and choose module.
Collaboration set chooses the information that module accepts to send from user's detection module, calculate the signal interference ratio of user, outage probability and in the handling capacity of whole cell, after the distance of cell base station and the situation of base station, peripheral cell residing for contrast user distance, dynamically consider user's generation the need of the scheme that carries out cooperating and finally cooperate.
The function chosen of present system collaboration set focuses on user's detection module and collaboration set chooses module, the position of user is drawn by user's detection module, signal intensity, information such as disturbed condition and be transferred to collaboration set and choose module, collaboration set generation module is by the information transmitted, decide whether to cooperate by algorithm, choose which collaboration set effect if carried out cooperation best.
As in figure 2 it is shown, user's detection module of the present invention is mainly used according to user distance current base station position, generate the signal interference ratio of active user, ambient signals intensity and disturbed condition, carry out collecting by the information of generation and mail to collaboration set simultaneously and choose module.
As shown in Figure 3, the collaboration set of the present invention is chosen module and mainly by attached, with disturbed condition, signal intensity in the data source of feedback is generated a threshold value, the signal interference ratio of user is compared with generating threshold value, such as less than give threshold value and then will carry out collaboration communication, consider handling capacity and the system load of system, by the utility function reasonable distribution collaboration set of system.
As shown in Figure 4, according to a upper module institute feedack, throughput of system is drawn by power system capacity formula, then system load loss is calculated according to the modifying factor provided, both are passed to betting model calculate, Nash Equilibrium will be found between capacity and load loss in time, finally send control centre to, in distribution collaboration set.
As it is shown in figure 5, present invention also offers the method for designing of a kind of CoMP system based on theory of games, the method comprises the steps:
Step 1: the ergodic capacity of community is divided into two parts, i.e. non-cooperating district and coordinated regions.Ergodic capacity is calculated according to Shannon momentary output.Non-cooperating district with the computational methods of coordinated regions is:
WhereinWithFor non-cooperating district and coordinated regions momentary output, r is the radius size in non-cooperating district, and R is whole cell size.F (ρ, θ) is the probability density function of service area.
Step 2: system load calculates
In the MIMO downlink transfer of FDD, the pilot frequency sequence that user is sent by base station estimates correlated channels, and by feedback of channel information to base station, base station must keep transmission until it is able to receive that the channel information of all users, thus can cause the delay that data are transmitted, and described method devises clean handling capacity for representing this loss, it may be assumed that
Definition modifying factor α is:
Wherein, NfIt is the number of bits of feedback of all users, NIIt is the additional bit identifying user, TfIt it is bit transmission time.
Step 3: coupling system capacity and system load, the utility function of foundation, it may be assumed that
Step 4: design game theoretical model
By cooperative base station quantity McChanging as independent variable, the strategy in game theoretical model with cooperation radius r, game theoretical model includes:
1) participant is: power system capacity and system load loss, N={1,2}；
2) policy space is: ζiWhereinMcFor cooperative base station quantity,
R is cooperation radius；
3) revenue function, it may be assumed that
The calculating of step 5:Nash equilibrium solution
If the Nash equilibrium of continuous strategy game, as long as revenue function uiC () is continuous print, just can by the method seeking extreme value obtain each participant i for other participant-i whole strategy most preferably reflect function. and participant reflection function focus must be just Nash equalize, therefore, for the calculating of the Nash equilibrium solution of this problem, can sum up in the point that for revenue function U (Mc) extreme value calculate.
The state traversals capacity of collaboration user is through being reduced to:
In non-cooperating region, the ergodic capacity of user is through being reduced to:
Use control variate method to McWith r derivation respectively, draw the utility function relation with both.
Claims (5)
1. a CoMP system based on theory of games, it is characterised in that described system includes that user's detection module and collaboration set choose module；
User's detection module is used for analyzing user's location information, the data of described information are uploaded by cell phone network equipment, draw the positional information of user distance base station, the signal intensity of present position and around the information such as disturbed condition after, the information of generation is collected, and mails to collaboration set simultaneously and choose module；
Collaboration set chooses the information that module accepts to send from user's detection module, calculate the signal interference ratio of user, outage probability and the handling capacity in whole cell (i.e. community), after the distance of cell base station and the situation of base station, peripheral cell residing for contrast user distance, dynamically consider user's generation the need of the scheme that carries out cooperating and finally cooperate.
A kind of CoMP system based on theory of games the most according to claim 1, it is characterized in that, the function of choosing of described cooperative system collection focuses on user's detection module and collaboration set chooses module, the position of user is drawn by user's detection module, signal intensity, information such as disturbed condition and be transferred to collaboration set and choose module, collaboration set generation module, by the information transmitted, decides whether to cooperate by algorithm.
3. the method for designing of a CoMP system based on theory of games, it is characterised in that described method comprises the steps:
Step 1: the ergodic capacity of community is divided into two parts, i.e. non-cooperating district and coordinated regions, calculate ergodic capacity according to Shannon momentary output；
Step 2: system load calculates；
In the MIMO downlink transfer of FDD, the pilot frequency sequence that user is sent by base station estimates correlated channels, and by feedback of channel information to base station, base station must keep transmission until it is able to receive that the channel information of all users, devise clean handling capacity for representing that this loss, i.e. feedback overhead are by system average throughputIt is reduced to
Definition modifying factor α is:
Wherein, NfIt is the number of bits of feedback of all users, NIIt is the additional bit identifying user, TfIt is bit transmission time:
Step 3: coupling system capacity and system load, the utility function of foundation, it may be assumed that
Step 4: design game theoretical model；
By cooperative base station quantity McChanging as independent variable, the strategy in game theoretical model with cooperation radius r, game theoretical model includes:
1) participant is: power system capacity and system load loss, N={1,2}；
2) policy space is: ζiWhereinMcFor cooperative base station quantity, r is cooperation radius；
3) revenue function, it may be assumed that
The calculating of step 5:Nash equilibrium solution；
If the Nash equilibrium of continuous strategy game, as long as revenue function uiC () is continuous print, just the method by seeking extreme value obtain each participant i for other participant-i whole strategy most preferably reflect function. and participant reflection function focus must be just Nash equilibrium, therefore, for the calculating of the Nash equilibrium solution of this problem, sum up in the point that for revenue function U (Mc) extreme value calculate, it may be assumed that
The state traversals capacity of collaboration user is through being reduced to:
In non-cooperating region, the ergodic capacity of user is through being reduced to:
Use control variate method to McWith r derivation respectively, draw the utility function relation with both.
The method for designing of a kind of CoMP system based on theory of games the most according to claim 3, it is characterised in that the non-cooperating district described in described step 1 with the computational methods of coordinated regions is:
WhereinWithFor non-cooperating district and coordinated regions momentary output, r is the radius size in non-cooperating district, and R is whole cell size, and f (ρ, θ) is the probability density function of service area.
The method for designing of a kind of CoMP system based on theory of games the most according to claim 3, it is characterised in that described method is applied to CoMP system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106788622A (en) * | 2017-01-13 | 2017-05-31 | 西安电子科技大学 | The descending coordinated multi-point transmission method of WLAN customer-centric |
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