CN103313205A - Optimization relay selection based adaptive collaborative multicast method and system - Google Patents

Optimization relay selection based adaptive collaborative multicast method and system Download PDF

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CN103313205A
CN103313205A CN2013102216735A CN201310221673A CN103313205A CN 103313205 A CN103313205 A CN 103313205A CN 2013102216735 A CN2013102216735 A CN 2013102216735A CN 201310221673 A CN201310221673 A CN 201310221673A CN 103313205 A CN103313205 A CN 103313205A
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multicast
mobile phone
base station
phone users
cooperation
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CN103313205B (en
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周一青
刘航
焦惠芳
田霖
黄伊
石晶林
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Institute of Computing Technology of CAS
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Abstract

The invention provides an optimization relay selection based adaptive collaborative multicast method and system. The method includes the steps of firstly, acquiring the number of cell users for counting statistics on mobile terminal users receiving corresponding multicast services in a cell, and secondly, judging the number of the mobile terminal users in the cell to decide to adopt corresponding multi-cast modes; the second step further includes: when the number N of the mobile terminal users in the cell is smaller than a set threshold value N*, a base station provides communication services in a traditional multicast mode; when the number of the mobile terminal users in the cell is larger than or equal to the threshold value N*, the base station provides communication services in a relay optimization selection based two-stage multicast transmission mode, wherein N* is the number of mobile terminal users of divisional two-stage collaborative multicast. The invention further provides the base station and a mobile terminal used for the adaptive collaborative multicast system.

Description

A kind of adaptive cooperation multicasting method and system based on optimizing relay selection
Technical field
The present invention relates to a kind of method and system of broadband wireless communications, especially relate to a kind of adaptive cooperation multicasting method, system and base station thereof and portable terminal based on optimizing relay selection of cooperation multi-casting communication in the broadband wireless communications.
Background technology
In radio communication, multicast service is a kind of efficient communications mode, and base station (BS) is with certain power P BSWith data rate R OneUser in the residential quarter sends data, and the mobile phone users in the residential quarter receives the signal from the base station, if its signal to noise ratio (snr) that receives is greater than (speed is R to these data of definite decoding OneData) needed signal to noise ratio snr One, R wherein One=Blog 2(1+SNR One), B is system bandwidth.Then this mobile phone users can successfully receive the data from the base station; If the signal to noise ratio that certain mobile phone users receives is less than SNR One, then mobile phone users is decoded unsuccessfully.Cell coverage is defined as the ratio that successfully receives in the residential quarter from mobile phone users number with total mobile phone users number of base station data.
In traditional multi-casting communication service, because the dtr signal from the base station that the edge mobile terminal user receives, so for the given cell coverage C of safeguards system Th, the base station is with a relatively large power P BS, less data rate R OneCould ensure given coverage rate.
Two stages cooperations multicast is that the time slot with traditional multicast is divided into two time slot T 1And T 2, in the phase I base station with power P BS, CWith speed R Two, 1Mobile phone users in the residential quarter sends data, if the signal to noise ratio that mobile phone users receives in the residential quarter is greater than SNR Two, 1, (R Two, 1=Blog 2(1+SNR Two, 1)), then this mobile phone users has successfully received the data from the base station, and these mobile phone users at phase I success receive data have formed successful mobile phone users set, the second time slot T of two stages cooperation multicast 2, from successful mobile phone users set, select part mobile phone users composition or all mobile phone users composition cooperation set, the successful mobile phone users in these set that cooperate is with power P MSWith speed R Two, 2Other mobile phone users in the residential quarter sends the data from the base station that it received in the phase I.Those do not have the successfully mobile phone users of reception in the phase I, receive the signal from all relayings, if its signal to noise ratio that receives is greater than SNR Two, 2, R Two, 2=Blog 2(1+SNR Two, 2) then it can successfully be decoded, and represents that it receives successfully, otherwise can not be successful.
Because the cooperation multicast of two stages need to provide the data rate identical with traditional multicast, owing to passed to respectively the part mobile phone users with same data in two stages of the multicast that cooperates, so satisfy R OneT=R Two, 1T 1=R Two, 2T 2
Ensureing identical coverage rate C ThCondition under, traditional multicast can be expressed as respectively P with system's gross power of the multicast that cooperates BSWith
Figure BDA00003307582700021
Wherein, BS is the base station, and MS is mobile phone users.
CN102378122A(201110336561.8 the applicant) in the patent application, the system of selection of a kind of self adaptation multicast transmission mechanism is disclosed, it comprises: step 1, the mobile phone users that receives corresponding multicast service in the residential quarter is carried out counting statistics, to obtain number of users of mobile terminal; Step 2, judge that whether number of users of mobile terminal is less than given minimum number of users of mobile terminal order threshold value; If so, adopt traditional multicast mode, if not, terminal cooperation multicast mode adopted.Described traditional multicast mode refers to: the base station is embodied as the one group of mobile phone users that receives identical multicast service by single transmission provides service, and transmission rate equals to ensure C in the residential quarter ThThe mobile phone users speed that can receive; Described terminal cooperation multicast mode refers to: can to serve as relaying be that the mobile phone users of bad channel conditions is transmitted the data that receive from the base station to the good terminal of channel condition in the same multicast group.According to the channel condition of number of users of mobile terminal amount and mobile phone users, the transmission means of adaptively selected employing tradition multicast or cooperation multicast, having improved throughput of system is the multicast transmission performance.Its goal of the invention of this patent application is the throughput for system, but not system power dissipation.Because its care is not energy consumption, but throughput, in order to improve to greatest extent throughput, this patent application case is elected to be the cooperation set with all successful mobile phone users, participates in the second stage cooperation, and lacks the optimization to the relaying number.In addition, the method coverage rate of the multicast service that ensures surely some fixed rates that also differs.
Summary of the invention
Technical problem to be solved by this invention provides a kind of adaptive cooperation multicasting method, system and base station thereof and portable terminal based on optimizing relay selection, can more effectively save system power dissipation in the situation of the coverage rate that ensures multicast service.
To achieve these goals, the invention provides a kind of adaptive cooperation multicasting method based on optimizing relay selection, comprise: obtain the step of cell mobile terminal number of users, be used for the mobile phone users that receives corresponding multicast service in the residential quarter is carried out counting statistics; Judge that cell mobile terminal user number is to determine to adopt the step of corresponding multicast mode; Wherein, in judging that cell mobile terminal user number is with the step that determines the corresponding multicast mode of employing, further comprise:
When mobile phone users number N was less than a setting threshold N* in the residential quarter, the base station adopted traditional multicast mode that communication service is provided; When the mobile phone users number in the residential quarter during more than or equal to this threshold value N*, the base station adopts the two stage multicast transmission modes of selecting based on relaying optimization that communication service is provided, and wherein N* is for distinguishing the mobile phone users number of two stages cooperation multicast.
The above-mentioned adaptive cooperation multicasting method based on the optimization relay selection, wherein, the described two stage multicast transmission modes of selecting based on relaying optimization provide communication service, comprise the steps: again
The base station is with power Carry out phase I cooperation multicast transmission, will be in certain radius more afterwards
Figure BDA00003307582700032
Outside all successful mobile phone users form the cooperation set, participate in the transmission of second stage and go, after the tradition multicast of two stages, the coverage rate of safeguards system is C Th, wherein:
Figure BDA00003307582700033
For satisfying the base station transmitting power of system's gross power minimum;
Equal C for satisfying cell coverage ThCell relays select radius;
C ThFor satisfying the corresponding cell coverage of base station transmitting power of system's gross power minimum.
The above-mentioned adaptive cooperation multicasting method based on the optimization relay selection, wherein, described base station power
Figure BDA00003307582700035
With the relay selection start position information
Figure BDA00003307582700036
Calculate in advance in the listing file that leaves described base station in.
The above-mentioned adaptive cooperation multicasting method based on the optimization relay selection, wherein, described N*,
Figure BDA00003307582700037
With
Figure BDA00003307582700038
Calculation procedure as follows:
Suppose that the mobile phone users number in the residential quarter is N, then in the multicast cooperation of two stages, when base station power is P BS, CThe time coverage rate:
Figure BDA00003307582700039
P (N wherein 1) be illustrated in interval [R BS, C(N), R] in have N 1The probability of individual successful mobile phone users, C Cond(N 1) be illustrated in this N 1After individual successful mobile phone users participates in and goes in the cooperation, the coverage rate of two stages cooperation multicast;
When the mobile phone users number being set being N, a given base station power P BS, C, corresponding covering radius R BS, C(N), suppose interval [R this moment BS, C(N), R] in average successful mobile phone users number be
Figure BDA00003307582700041
Select described successful mobile phone users to participate in the cooperation of second stage and go, the coverage rate of the multicast of two stages transmission equals given threshold value C just Th, this moment, systemic-function equaled
Figure BDA00003307582700042
The base station transmitting power that satisfies system's gross power minimum is set: The cell coverage that satisfies that then this power is corresponding equals C ThCell relays select radius to be defined as This moment is interval
Figure BDA00003307582700045
Between the relaying mobile phone users number that exists be defined as
Figure BDA00003307582700046
Be arranged on that to satisfy cell coverage in traditional multicast be C ThBase station power be P BS, by
Figure BDA00003307582700047
Calculate corresponding mobile phone users number N*.
Above-mentioned a kind of adaptive cooperation multicasting method based on optimizing relay selection, wherein, all are in the interval Interior described successful mobile phone users participates in second stage cooperation multicast with trunking scheme.
In order to realize better above-mentioned purpose, the present invention also provides a kind of adaptive cooperation multicast system based on optimizing relay selection, comprise a plurality of mobile phone users in base station, the residential quarter, wherein: described base station also is provided with a kind of adaptive cooperation multicast device based on optimizing relay selection, thereby obtains cell mobile terminal number of users N for the described mobile phone users that receives corresponding multicast service in the described residential quarter is added up; As described cell mobile terminal user number N during less than a setting threshold N*, described base station provides signal of communication in traditional multicast mode; As cell mobile terminal number of users N during more than or equal to this threshold value N*, adopt the two stage multicast transmission modes of selecting based on relaying optimization that signal of communication is provided; Wherein, N* is for distinguishing the mobile phone users number of two stages cooperation multicast.
Above-mentioned a kind of adaptive cooperation multicast system based on optimizing relay selection, wherein, described base station is first with power
Figure BDA00003307582700049
Carry out phase I cooperation multicast transmission, will be in certain radius more afterwards
Figure BDA000033075827000410
Outside all successful mobile phone users form the cooperation set, participate in the transmission of second stage and go, after the tradition multicast of two stages, the coverage rate of safeguards system is C Th, wherein:
For satisfying the base station transmitting power of system's gross power minimum;
Figure BDA00003307582700052
Equal C for satisfying cell coverage ThCell relays select radius;
C ThFor satisfying the corresponding cell coverage of base station transmitting power of system's gross power minimum.
The above-mentioned adaptive cooperation multicast system based on the optimization relay selection, wherein, described base station power
Figure BDA00003307582700053
With the relay selection start position information
Figure BDA00003307582700054
To leave in the described base station in the listing file mode.
The above-mentioned adaptive cooperation multicast system based on the optimization relay selection, wherein, described N*,
Figure BDA00003307582700055
With
Figure BDA00003307582700056
Calculated value:
Suppose that the mobile phone users number in the residential quarter is N, then in the multicast cooperation of two stages, when base station power is P BS, CThe time coverage rate: P (N wherein 1) be illustrated in interval [R BS, C(N), R] in have N 1The probability of individual successful mobile phone users, C Cond(N 1) be illustrated in this N 1After individual successful mobile phone users participates in and goes in the cooperation, the coverage rate of two stages cooperation multicast;
When the mobile phone users number being set being N, a given base station power P BS, C, corresponding covering radius R BS, C(N), suppose interval [R this moment BS, C(N), R] in average successful mobile phone users number be
Figure BDA00003307582700058
Select described successful mobile phone users to participate in the cooperation of second stage and go, the coverage rate of the multicast of two stages transmission equals given threshold value C just Th, this moment, systemic-function equaled
Figure BDA00003307582700059
The base station transmitting power that satisfies system's gross power minimum is set:
Figure BDA000033075827000510
The cell coverage that satisfies that then this power is corresponding equals C ThCell relays select radius to be defined as
Figure BDA000033075827000511
This moment is interval
Figure BDA000033075827000512
Between the relaying mobile phone users number that exists be defined as
Figure BDA000033075827000513
Be arranged on that to satisfy cell coverage in traditional multicast be C ThBase station power be P BS, by
Figure BDA00003307582700061
Calculate corresponding mobile phone users number N*.
The above-mentioned adaptive cooperation multicasting method based on the optimization relay selection, wherein, all are in the interval
Figure BDA00003307582700062
Interior described successful mobile phone users participates in second stage cooperation multicast with trunking scheme.
In order to realize better above-mentioned purpose, the present invention also provides a kind of base station for above-mentioned adaptive cooperation multicast system.
In order to realize better above-mentioned purpose, the present invention also provides a kind of portable terminal for above-mentioned adaptive cooperation multicast system.
Beneficial effect of the present invention is:
Adaptive multicast transmission method of the present invention and system can more effectively save system power dissipation in the situation of the coverage rate that ensures multicast service.When the mobile phone users number is less than N* in the residential quarter, adopt traditional multicast mode that service is provided; Mobile phone users number in the residential quarter is greater than N*, and is concrete when being N, adopts the two stage multicast transmission mechanisms of selecting based on relaying optimization.The base station is with power
Figure BDA00003307582700063
Carry out the phase I transmission, be in afterwards certain radius
Figure BDA00003307582700064
Outside all successful mobile phone users form the cooperation set, participate in the transmission of second stage and go.
Description of drawings
Fig. 1 is the method flow diagram of one embodiment of the invention base station side;
Fig. 2 is the method flow diagram of one embodiment of the invention mobile phone users side;
Fig. 3 is the adaptive cooperation multicast system block diagram of one embodiment of the invention;
Fig. 4 is optimum base station power and relaying number tendency chart;
Fig. 5 is cooperation multicast optimal power and traditional multicast power comparison diagram.
Wherein, Reference numeral
1 base station
2 mobile phone users
3 adaptive cooperation multicast devices
100-202,300-700 step
Embodiment
Referring to Fig. 1 and Fig. 2, Fig. 1 is the method flow diagram of one embodiment of the invention base station 1 side, and Fig. 2 is the method flow diagram of one embodiment of the invention mobile phone users 2 end side.Adaptive cooperation multicasting method based on optimizing relay selection of the present invention comprises:
Step 100 is obtained the step that cell mobile terminal user 2 counts, and is used for the mobile phone users 2 that receives corresponding multicast service in the residential quarter is carried out counting statistics;
Step 200 judges that cell mobile terminal user 2 numbers are to determine to adopt the step of corresponding multicast mode;
Wherein, in judging that cell mobile terminal user 2 numbers are with the step that determines the corresponding multicast mode of employing, further comprise:
Step 201, as 2 number N of mobile phone users in the residential quarter during less than a setting threshold N*, base station 1 adopts traditional multicast mode that communication service is provided;
Step 202, when mobile phone users 2 numbers in the residential quarter during more than or equal to this threshold value N*, base station 1 adopts the two stage multicast transmission modes of selecting based on relaying optimization that communication service is provided, and wherein N* is for distinguishing mobile phone users 2 numbers of two stages cooperation multicast.
Wherein, the described two stage multicast transmission modes of selecting based on relaying optimization provide communication service, comprise the steps: again
Base station 1 is with power
Figure BDA00003307582700071
Carry out phase I cooperation multicast transmission, will be in certain radius more afterwards Outside all successful mobile phone users 2 form the cooperation set, participate in the transmission of second stage and go, after the tradition multicast of two stages, the coverage rate of safeguards system is C Th, wherein:
Figure BDA00003307582700073
For satisfying base station 1 transmitting power of system's gross power minimum;
Figure BDA00003307582700074
Equal C for satisfying cell coverage ThCell relays select radius;
C ThFor satisfying the corresponding cell coverage of base station 1 transmitting power of system's gross power minimum.
Wherein, described base station 1 power
Figure BDA00003307582700075
With the relay selection start position information
Figure BDA00003307582700076
Calculate in advance in the listing file that leaves described base station 1 in.
Wherein, described N*,
Figure BDA00003307582700077
With Calculation procedure as follows:
Suppose that mobile phone users 2 numbers in the residential quarter are N, then in the multicast cooperation of two stages, when base station 1 power is P BS, CThe time coverage rate:
Figure BDA00003307582700079
P (N wherein 1) be illustrated in interval [R BS, C(N), R] in have N 1The probability of individual successful mobile phone users 2, C Cond(N 1) be illustrated in this N 1After individual successful mobile phone users 2 participates in and goes in the cooperation, the coverage rate of two stages cooperation multicast;
When mobile phone users 2 numbers being set being N, given base station 1 power P BS, C, corresponding covering radius R BS, C(N), suppose interval [R this moment BS, C(N), R] in average successful mobile phone users 2 numbers be
Figure BDA00003307582700081
Select described successful mobile phone users 2 to participate in the cooperation of second stage and go, the coverage rate of the multicast of two stages transmission equals given threshold value C just Th, this moment, systemic-function equaled P tot ( N ) = P BS , C T 1 T + P MS N P BS , C , R BS , C T 2 T ;
Base station 1 transmitting power that satisfies system's gross power minimum is set:
Figure BDA00003307582700083
The cell coverage that satisfies that then this power is corresponding equals C ThCell relays select radius to be defined as
Figure BDA00003307582700084
This moment is interval Between relaying mobile phone users 2 numbers that exist be defined as
Figure BDA00003307582700086
Be arranged on that to satisfy cell coverage in traditional multicast be C ThBase station 1 power be P BS, by
Figure BDA00003307582700087
Calculate corresponding mobile phone users 2 number N*.
Wherein, described all successful mobile phone users 2 participate in second stage cooperation multicast with trunking scheme.
Specifically comprise:
Step 300, decoding terminals is from the information of base station 1;
Step 400 judges whether decoding is successful, if success, then execution in step 401, and if not, then execution in step 500;
Step 401 is judged
Figure BDA00003307582700088
If then execution in step 700, if not, then execution in step 600;
Step 500 receives information in multicast cooperation second stage;
Step 600 does not participate in second stage cooperation multicast;
Step 700, relaying participate in the second stage cooperation multicast and go.
Referring to Fig. 3, Fig. 3 is the adaptive cooperation multicast system block diagram of one embodiment of the invention.Adaptive cooperation multicast system based on optimizing relay selection of the present invention, comprise a plurality of mobile phone users 2 in base station 1, the residential quarter, described base station 1 also is provided with a kind of adaptive cooperation multicast device 3 based on optimizing relay selection, thereby obtains cell mobile terminal user 2 number N for the described mobile phone users 2 that receives corresponding multicast service in the described residential quarter is added up; As described cell mobile terminal user 2 number N during less than a setting threshold N*, described base station 1 provides signal of communication in traditional multicast mode; When cell mobile terminal user 2 counts N more than or equal to this threshold value N*, adopt the two stage multicast transmission modes of selecting based on relaying optimization that signal of communication is provided; Wherein, N* is for distinguishing mobile phone users 2 numbers of two stages cooperation multicast.
Wherein, described base station 1 is first with power Carry out phase I cooperation multicast transmission, will be in certain radius more afterwards
Figure BDA00003307582700092
Outside all successful mobile phone users 2 form the cooperation set, participate in the transmission of second stage and go, after the tradition multicast of two stages, the coverage rate of safeguards system is C Th, wherein:
For satisfying base station 1 transmitting power of system's gross power minimum;
Figure BDA00003307582700094
Equal C for satisfying cell coverage ThCell relays select radius;
C ThFor satisfying the corresponding cell coverage of base station 1 transmitting power of system's gross power minimum.
In the present embodiment, described base station 1 power
Figure BDA00003307582700095
With the relay selection start position information
Figure BDA00003307582700096
To leave in the described base station 1 in the listing file mode.Described N*,
Figure BDA00003307582700097
With Calculated value:
Suppose that mobile phone users 2 numbers in the residential quarter are N, then in the multicast cooperation of two stages, when base station 1 power is P BS, CThe time coverage rate:
Figure BDA00003307582700099
P (N wherein 1) be illustrated in interval [R BS, C(N), R] in have N 1The probability of individual successful mobile phone users 2, C Cond(N 1) be illustrated in this N 1After individual successful mobile phone users 2 participates in and goes in the cooperation, the coverage rate of two stages cooperation multicast;
When mobile phone users 2 numbers being set being N, given base station 1 power P BS, C, corresponding covering radius R BS, C(N), suppose interval [R this moment BS, C(N), R] in average successful mobile phone users 2 numbers be
Figure BDA000033075827000910
Select described successful mobile phone users 2 to participate in the cooperation of second stage and go, the coverage rate of the multicast of two stages transmission equals given threshold value C just Th, this moment, systemic-function equaled P tot ( N ) = P BS , C T 1 T + P MS N P BS , C , R BS , C T 2 T ;
Base station 1 transmitting power that satisfies system's gross power minimum is set: The cell coverage that satisfies that then this power is corresponding equals C ThCell relays select radius to be defined as
Figure BDA00003307582700103
This moment is interval
Figure BDA00003307582700104
Between relaying mobile phone users 2 numbers that exist be defined as
Figure BDA00003307582700105
Be arranged on that to satisfy cell coverage in traditional multicast be C ThBase station 1 power be P BS, by Calculate corresponding mobile phone users 2 number N*.
In addition, the present invention includes base station 1 and portable terminal 2 for above-mentioned adaptive cooperation multicast system.
The below describes the course of work of the present invention in detail with a specific embodiment;
For base station 1 side, the parameter N of describing mobile phone users 2 numbers in the residential quarter is periodically gone to read in base station 1, if these mobile phone users 2 numbers greater than N*, then base station 1 adopts traditional multicast mode to provide service for mobile phone users 2, namely with power P BSWith speed R One Mobile phone users 2 in time slot T in the residential quarter transmits, and the mobile phone users 2 in this moment residential quarter does not participate in cooperation.
When mobile phone users 2 numbers in the residential quarter greater than N* the time, then this moment goes to table look-up and obtains corresponding base station 1 power in base station 1
Figure BDA00003307582700107
With the relay selection start position information
Figure BDA00003307582700108
The phase I T that then cooperates in multicast 1In, base station 1 is packaged in the relay selection start position information in the multi-case data, simultaneously with power Mobile phone users 2 in the residential quarter sends data.
End side, under cooperation multicast pattern, if certain mobile phone users 2 can successfully receive the phase I data from base station 1, the decoding terminals multi-case data obtains corresponding positional information
Figure BDA000033075827001010
And the average signal power from base station 1 that receives according to oneself is estimated its distance R between base station 1 EstimateIf this distance greater than
Figure BDA000033075827001011
Then this relaying participates in the second stage cooperation and goes, namely at time slot T 2Interior with power P MSWith speed R Two, 2The own data of receiving in the phase I repacked send, if this user successfully decoded in the phase I, but the distance of itself and base station 1 less than
Figure BDA00003307582700111
Then this mobile phone users 2 does not participate in the second stage cooperation and goes.
If certain mobile phone users 2 fails in the phase I and receives data from base station 1, then in the second stage of multicast cooperation, it accepts the signal from all relayings.And under traditional multicast pattern, the user is all the time in the information that receives from base station 1.
N* wherein, With
Figure BDA00003307582700113
Can calculate in advance and leave base station 1 end in, base station 1 only need to be gone to table look-up to get final product in certain data of needs.
The below provides N*,
Figure BDA00003307582700114
With
Figure BDA00003307582700115
Computational methods
Suppose that mobile phone users 2 numbers in the residential quarter are N, then in the multicast cooperation of two stages, when base station 1 power is P BS, CThe time,
If we select to be in [R BS, C(N), R] all mobile phone users 2 in interval participate in the cooperation and go, because at interval [R BS, C(N), R] in through mobile phone users 2 numbers after 1 transmission of phase I base station because the impact of the factors such as channel condition is a random number, equal so can obtain the coverage rate of this moment:
C = Σ N 1 = 0 N p ( N 1 ) · C cond ( N 1 )
P (N wherein 1) be illustrated in interval [R BS, C(N), R] in have N 1The probability of individual successful mobile phone users 2, C Cond(N 1) be illustrated in this N 1After individual successful mobile phone users 2 participates in and goes in the cooperation, the coverage rate of two stages cooperation multicast.
So when mobile phone users 2 numbers are N, when given base station 1 power P BS, CThe time, can find a corresponding covering radius R BS, C(N), suppose interval [R this moment BS, C(N), R] in average successful mobile phone users 2 numbers be
Figure BDA00003307582700117
Select these successful mobile phone users 2 to participate in the cooperation of second stage and go, the coverage rate of the multicast of two stages transmission equals given threshold value C just ThThis moment, system always equaled well P tot ( N ) = P BS , C T 1 T + P MS N P BS , C , R BS , C T 2 T ;
We can select base station 1 transmitting power that satisfies system's gross power minimum so, are defined as:
Figure BDA00003307582700122
The cell coverage that satisfies that then this power is corresponding equals C ThCell relays select radius to be defined as This moment is interval
Figure BDA00003307582700124
Between relaying mobile phone users 2 numbers that exist be defined as
Figure BDA00003307582700125
Satisfying cell coverage in traditional multicast is C ThBase station 1 power be P BS, it does not change with the variation of 2 numbers of mobile phone users in the residential quarter.Then order
Figure BDA00003307582700126
Solve corresponding mobile phone users 2 numbers, be N*, distinguish mobile phone users 2 numbers of two stages cooperation multicast.
Referring to Fig. 4, Fig. 4 is optimum base station 1 power and relaying number tendency chart.This figure is optimum base station 1 power under different mobile terminal user 2 numbers that emulation obtains
Figure BDA00003307582700127
With corresponding relaying number
Figure BDA00003307582700128
In emulation, traditional multicast time slot in the wireless transmission, is only considered the impact of large scale decline and small scale simultaneously by five equilibrium.In the emulation small scale is modeled as Rayleigh fading.In the second stage of multicast cooperation, certain not successful mobile phone users 2 can receive the signal from a plurality of relayings, as long as its maximum delay is less than the CP length of OFDM symbol; Simultaneously 1 channel gain (path loss gain) to mobile phone users 2 and mobile phone users 2 to mobile phone users 2 is respectively A to channel from the base station 1, A 2, other simulation parameters see the following form:
Carrier frequency 2.5G
System bandwidth B 10M
The 1 channel gain A to mobile phone users 2 from the base station 1 2.3568×10 -2
2 the channel gain A from mobile phone users 2 to mobile phone users 2 1.6672×10 -4
The path loss factor gamma 4
The tradition multicast ensures the corresponding base station of coverage rate 1 power P BS 43dBm
Single mobile terminal user 2 transmitting power P MS 21dBm
Noise spectral density N 0 -174dBm/Hz
System's coverage rate requires C th 95%
Radius of society R 1500m
The multicast service speed R of tradition multicast one 0.45bps/Hz
Referring to Fig. 5, Fig. 5 is cooperation multicast optimal power and traditional multicast power comparison diagram.As we can see from the figure, along with increasing of 2 numbers of mobile phone users in the residential quarter, base station 1 power descends gradually, and needed relaying number rises gradually.Can find out from top simulation result, when mobile phone users 2 numbers less than 28 the time, the energy consumption efficiency of tradition multicast is high, when mobile phone users 2 numbers greater than 28 the time, the tradition multicast is better, when mobile phone users 2 numbers were 100, the more traditional multicast of two stages cooperation multicast energy consumption descended and surpasses 25%.
Self-adaption multicast transmission method of the present invention and system to save system power dissipation as purpose, in the condition that ensures cell coverage, take full advantage of the advantage of cooperation multicast, reduce system's gross power.Mobile phone users 2 of the present invention participates in cooperation multicast second stage, does not need base station 1 signaling consumption, and mobile phone users 2 is judged distance voluntarily according to average signal strength, and is therefore more practical.And effectively carried out relay selection, and optimized covering, namely ensured coverage rate, reduced again system power dissipation.Under the condition of given multicast speed, the differ coverage rate that ensures surely mobile phone users 2 in the residential quarter and lack optimization to the relaying selection strategy of method of the prior art, and the present invention one safeguards system coverage rate surely.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (12)

1. the adaptive cooperation multicasting method based on the optimization relay selection comprises: obtain the step of cell mobile terminal number of users, be used for the mobile phone users that receives corresponding multicast service in the residential quarter is carried out counting statistics; Judge that cell mobile terminal user number is to determine to adopt the step of corresponding multicast mode; It is characterized in that, in judging that cell mobile terminal user number is with the step that determines the corresponding multicast mode of employing, further comprise:
When mobile phone users number N was less than a setting threshold N* in the residential quarter, the base station adopted traditional multicast mode that communication service is provided; When the mobile phone users number in the residential quarter during more than or equal to this threshold value N*, the base station adopts the two stage multicast transmission modes of selecting based on relaying optimization that communication service is provided, and wherein N* is for distinguishing the mobile phone users number of two stages cooperation multicast.
2. the adaptive cooperation multicasting method based on optimizing relay selection according to claim 1 is characterized in that, the described two stage multicast transmission modes of selecting based on relaying optimization provide communication service, comprise the steps: again
The base station is with power
Figure FDA00003307582600011
Carry out phase I cooperation multicast transmission, will be in certain radius more afterwards
Figure FDA00003307582600012
Outside all successful mobile phone users form the cooperation set, participate in the transmission of second stage and go, after the tradition multicast of two stages, the coverage rate of safeguards system is C Th, wherein:
Figure FDA00003307582600013
For satisfying the base station transmitting power of system's gross power minimum;
Figure FDA00003307582600014
Equal C for satisfying cell coverage ThCell relays select radius;
C ThFor satisfying the corresponding cell coverage of base station transmitting power of system's gross power minimum.
3. the adaptive cooperation multicasting method based on optimizing relay selection according to claim 1 is characterized in that described base station power
Figure FDA00003307582600015
With the relay selection start position information Calculate in advance in the listing file that leaves described base station in.
4. according to claim 1,2 or 3 described adaptive cooperation multicasting methods based on optimizing relay selection, it is characterized in that, described N*, With
Figure FDA00003307582600018
Calculation procedure as follows:
Suppose that the mobile phone users number in the residential quarter is N, then in the multicast cooperation of two stages, when base station power is P BS, CThe time coverage rate: P (N wherein 1) be illustrated in interval [R BS, C(N), R] in have N 1The probability of individual successful mobile phone users, C Cond(N 1) be illustrated in this N 1After individual successful mobile phone users participates in and goes in the cooperation, the coverage rate of two stages cooperation multicast;
When the mobile phone users number being set being N, a given base station power P BS, C, corresponding covering radius R BS, C(N), suppose interval [R this moment BS, C(N), R] in average successful mobile phone users number be Select described successful mobile phone users to participate in the cooperation of second stage and go, the coverage rate of the multicast of two stages transmission equals given threshold value C just Th, this moment, systemic-function equaled
Figure FDA00003307582600022
The base station transmitting power that satisfies system's gross power minimum is set: The cell coverage that satisfies that then this power is corresponding equals C ThCell relays select radius to be defined as
Figure FDA00003307582600024
This moment is interval Between the relaying mobile phone users number that exists be defined as
Figure FDA00003307582600026
Be arranged on that to satisfy cell coverage in traditional multicast be C ThBase station power be P BS, by
Figure FDA00003307582600027
Calculate corresponding mobile phone users number N*.
5. a kind of adaptive cooperation multicasting method based on optimizing relay selection according to claim 4 is characterized in that, all are in the interval Interior described successful mobile phone users participates in second stage cooperation multicast with trunking scheme.
6. one kind based on the adaptive cooperation multicast system of optimizing relay selection, comprise a plurality of mobile phone users in base station, the residential quarter, it is characterized in that, described base station also is provided with a kind of adaptive cooperation multicast device based on optimizing relay selection, thereby obtains cell mobile terminal number of users N for the described mobile phone users that receives corresponding multicast service in the described residential quarter is added up; As described cell mobile terminal user number N during less than a setting threshold N*, described base station provides signal of communication in traditional multicast mode; As cell mobile terminal number of users N during more than or equal to this threshold value N*, adopt the two stage multicast transmission modes of selecting based on relaying optimization that signal of communication is provided; Wherein, N* is for distinguishing the mobile phone users number of two stages cooperation multicast.
7. a kind of adaptive cooperation multicast system based on optimizing relay selection according to claim 6 is characterized in that, described base station is first with power
Figure FDA00003307582600029
Carry out phase I cooperation multicast transmission, will be in certain radius more afterwards
Figure FDA00003307582600031
Outside all successful mobile phone users form the cooperation set, participate in the transmission of second stage and go, after the tradition multicast of two stages, the coverage rate of safeguards system is C Th, wherein:
Figure FDA00003307582600032
For satisfying the base station transmitting power of system's gross power minimum;
Figure FDA00003307582600033
Equal C for satisfying cell coverage ThCell relays select radius;
C ThFor satisfying the corresponding cell coverage of base station transmitting power of system's gross power minimum.
8. the adaptive cooperation multicast system based on optimizing relay selection according to claim 6 is characterized in that described base station power With the relay selection start position information To leave in the described base station in the listing file mode.
9. according to claim 6,7 or 8 described adaptive cooperation multicast systems based on optimizing relay selection, it is characterized in that, described N*,
Figure FDA00003307582600036
With
Figure FDA00003307582600037
Calculated value:
Suppose that the mobile phone users number in the residential quarter is N, then in the multicast cooperation of two stages, when base station power is P BS, CThe time coverage rate:
Figure FDA00003307582600038
P (N wherein 1) be illustrated in interval [R BS, C(N), R] in have N 1The probability of individual successful mobile phone users, C Cond(N 1) be illustrated in this N 1After individual successful mobile phone users participates in and goes in the cooperation, the coverage rate of two stages cooperation multicast;
When the mobile phone users number being set being N, a given base station power P BS, C, corresponding covering radius R BS, C(N), suppose interval [R this moment BS, C(N), R] in average successful mobile phone users number be
Figure FDA00003307582600039
Select described successful mobile phone users to participate in the cooperation of second stage and go, the coverage rate of the multicast of two stages transmission equals given threshold value C just Th, this moment, systemic-function equaled
Figure FDA000033075826000310
The base station transmitting power that satisfies system's gross power minimum is set:
Figure FDA000033075826000311
The cell coverage that satisfies that then this power is corresponding equals C ThCell relays select radius to be defined as
Figure FDA00003307582600041
This moment is interval
Figure FDA00003307582600042
Between the relaying mobile phone users number that exists be defined as
Figure FDA00003307582600043
Be arranged on that to satisfy cell coverage in traditional multicast be C ThBase station power be P BS, by
Figure FDA00003307582600044
Calculate corresponding mobile phone users number N*.
10. the adaptive cooperation multicasting method based on optimizing relay selection according to claim 9 is characterized in that, all are in the interval
Figure FDA00003307582600045
Interior described successful mobile phone users participates in second stage cooperation multicast with trunking scheme.
11. base station that is used for any one described adaptive cooperation multicast system of claim 6 to 10.
12. portable terminal that is used for any one described adaptive cooperation multicast system of claim 6 to 10.
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