CN103747421A - Two-stage cooperative multicast method and system - Google Patents
Two-stage cooperative multicast method and system Download PDFInfo
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- CN103747421A CN103747421A CN201410014273.1A CN201410014273A CN103747421A CN 103747421 A CN103747421 A CN 103747421A CN 201410014273 A CN201410014273 A CN 201410014273A CN 103747421 A CN103747421 A CN 103747421A
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Abstract
The invention provides a two-stage cooperative multicast method and a two-stage cooperative multicast system. The method comprises the steps of performing first-stage cooperative multicast by a base station on cell users; selecting users serving as relays from receiving successful users to send data in a second stage according to distances between receiving failed users and the receiving successful users in the first stage. According to the method and the system, under a condition of guaranteeing the coverage rate of the system, the total power consumed by multicast can be reduced.
Description
Technical field
The present invention relates to radio resource management techniques, relate in particular to a kind of two stage cooperation multicasting method and systems.
Background technology
In radio communication, multicast service is a kind of efficient transmission means, and base station is with certain power P
bSwith data rate R
oneuser in community sends data.User in community receives the signal from base station, if its signal to noise ratio (snr) receiving is greater than these data of decoding, (speed is R
onedata) needed signal to noise ratio snr
one, R wherein
one=Blog
2(1+SNR
one), B is system bandwidth, this user can successfully receive the data from base station; If the signal to noise ratio that user receives is less than required SNR
one, this user failure of decoding.Cell coverage is defined as the ratio successfully receiving in community from user's number with total user's number of base station data.
In traditional multicast, the dtr signal from base station receiving due to edge customer, so for the given cell coverage C of safeguards system
th, base station can be with a relatively large power P
bSless data rate R
oneensure given coverage rate.Two stages cooperation multicasting technology is that the time slot of traditional multicast is divided into two time slot T
1and T
2, in first stage base station with power P
bS, Cwith speed R
two, 1user in community sends data, if the signal to noise ratio that in community, user receives is greater than SNR
two, 1, R wherein
two, 1=Blog
2(1+SNR
two, 1), this user successfully receives the data from base station, and these users that successfully receive data in the first stage form successful user's set.The second time slot T in the cooperation multicast of two stages
2(second stage) selects certain customers from successful user's set or whole user forms cooperation set, and the successful users (or title relaying) in these cooperation set are with power P
mSwith speed R
two, 2other user in community sends the data from base station that it received in the first stage.Those users that success does not receive in the first stage, receive the signal from all relayings.If its signal to noise ratio receiving is greater than SNR
two, 2, R
two, 2=Blog
2(1+SNR
two, 2), it can successfully be decoded, and represents that it receives successfully; Otherwise receive unsuccessful.Fig. 1 shows the schematic diagram of two stages cooperation multicast.
The cooperation multicast of two stages need to provide the data rate identical with traditional multicast, meets
ensureing identical coverage rate C
thcondition under, cooperate with the two stages system gross power of multicast of traditional multicast can be expressed as P
bSwith
for saving system power dissipation, prior art adopts adaptive multicast transmission method to save system power dissipation conventionally: in community, user's number is less than certain threshold value N
*time, adopt traditional multicast mode that service is provided; N when the user's number in community is greater than certain threshold value
*, adopt two stages cooperation multicast transmission mechanism.Base station is with power
carry out first stage transmission, be in afterwards certain radius
outside all successful user form cooperation set, participate in the transmission of second stage and go.
Yet after base station completes first stage cooperation multicast, the successful user in community and failed user's distribution are random, are not completely fixed.If there is not failed user around certain successful user, there is no need to elect this success user as relaying so completely.Therefore the cooperation of selecting all successful user outside certain radius to participate in second stage is inappropriate, and this may cause the excessive problem of system power dissipation.
Summary of the invention
For the problems referred to above, according to one embodiment of present invention, provide a kind of two stages cooperation multicasting method, described method comprises:
Step 1), by base station, to community user, carry out first stage cooperation multicast;
Step 2) user and receive the distance between successful user of taking defeat, based on the first stage selects user as relaying to send data in second stage in the successful user of described reception.
In one embodiment, step 2) comprising:
By the nearest reception success user of user that takes defeat described in the definite distance in described base station, select this to receive successful user; And
Transmitted signal notifies the successful user of selected reception to participate in second stage cooperation multicast.
In one embodiment, step 1) also comprises: by the positional information of all users under collection community, described base station.
In one embodiment, step 1) also comprises: the reception success user by the described first stage sends the successful signal of indication reception to described base station.
In one embodiment, described method also comprises:
Step 0), determine the transmitting power of described base station in the first stage.
In one embodiment, step 0) comprising:
Step 01), transmitting power is set;
Step 02), described base station completes first stage cooperation multicast with this transmitting power, the distance taking defeat between user and the successful user of reception based on the first stage, in the successful user of described reception, select to send data in second stage, calculate the cell coverage after the cooperation multicast of two stages;
Step 03), repeating step 02), according to the cell coverage of each calculating, obtain community average coverage rate;
Step 04), change transmitting power and return to step 02) calculate community average coverage rate corresponding to this transmitting power, until resulting community average coverage rate is given coverage rate threshold value C
th, transmitting power corresponding to Jiang Gai community average coverage rate be the transmitting power in the first stage as described base station.
When user's number is N under community, determine the base station transmitting power P of two stages cooperation multicast
bS, C(N) under can be online, carry out, and be stored in afterwards base station end.In actual motion, thereby can avoid double counting process by tabling look-up to obtain this power, reduce complexity simultaneously.
According to one embodiment of present invention, also provide a kind of two stages cooperations multicasting methods, comprising: whether the number that judges community user is greater than threshold value M, if be greater than threshold value M, carry out as the method as described in any one in claim 1-6; Otherwise carry out traditional multicast.
In one embodiment, described method is also included in before whether the number that judges community user be greater than threshold value M, according to following steps definite threshold M:
Step a), calculating are at given coverage rate threshold value C
thunder the gross power of traditional multicast;
Step b), community user number is set;
Step c), described base station is set at the transmitting power of the first stage of two stages cooperations multicasts, the base station transmitting power that its initial value is traditional multicast;
Step d), by described base station, complete first stage cooperation multicast, take defeat user and the distance receiving between successful user based on the first stage are selected, with in second stage transmission data, to obtain relaying number in the successful user of described reception;
Step e), repeating step d), according to the relaying number of each calculating, obtain average relaying number, according to average relaying number, obtain the gross power of two stages cooperation multicast, and add up community average coverage rate;
Step f), increase described base station in the transmitting power of the first stage of two stages cooperations multicasts and return to step d), until resulting community average coverage rate is given coverage rate threshold value C
th, the gross power of record two stages cooperation multicast is now the gross power of two stages cooperation multicast corresponding to this community user number;
Step g), change community user number and return to the gross power that step c) is calculated two stages cooperation multicast corresponding to this community user number, until the gross power that the gross power of resulting two stages cooperations multicasts is described traditional multicast, using community user number corresponding to the gross power of this two stages cooperation multicast as threshold value M.
In one embodiment, in step e), according to following formula, calculate the gross power of two stages cooperation multicast:
Wherein, P
bS, C(N) be described base station in the transmitting power of first stage of two stages cooperation multicast, the community user number of N for arranging, T
1for the time slot of first stage, T
2for the time slot of second stage, T is total time slot, N
zjfor average relaying number, P
mSfor the successful user of selected reception sends the power of data in second stage.
According to one embodiment of present invention, also provide a kind of two stages cooperation multicast system, comprising:
Multicast device, for carrying out first stage cooperation multicast by base station to community user; With
Trunking for the user and receive the distance between successful user of taking defeat based on the first stage, selects user as relaying to send data in second stage in the successful user of described reception.
Adopt the present invention can reach following beneficial effect:
The present invention adopts the relay selection strategy based on distance and a kind of method of definite base station transmitting power is provided, compared with prior art, the present invention can, in safeguards system coverage rate, use relaying still less, thereby greatly save system power dissipation in the cooperation multicast of two stages.
Accompanying drawing explanation
Fig. 1 is existing two stages cooperation multicasting method schematic diagram;
Fig. 2 is the flow chart of two stages cooperations multicasting methods according to an embodiment of the invention;
Fig. 3 is used according to an embodiment of the invention two stages cooperation multicasting method, traditional multicasting method and existing two stages cooperation multicasting method to carry out the schematic diagram of the gross power of multicast transmission; And
Fig. 4 is used according to an embodiment of the invention two stages cooperation multicasting methods and existing two stages cooperation multicasting method to carry out the schematic diagram of the relaying number of multicast transmission.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
According to one embodiment of present invention, provide a kind of two stages cooperation multicasting method.Generally, the method completes after first stage cooperation multicast in base station, adds up the user who successfully receives and therefrom selects user to carry out second stage cooperation multicast as relaying.As shown in Figure 2, the method comprises the following steps:
User's number under the first step, statistics community, base station, judges and carries out traditional multicast or the cooperation multicast of two stages according to this user's number.
The present invention is intended to save the system power dissipation of multicast transmission, and research shows, when user's number under community is especially little, the gross power that the cooperation multicast of two stages consumes may be greater than the gross power that traditional multicast consumes.Therefore, before carrying out multicast, can first judge whether the number of users under community is greater than a certain threshold value M, if be greater than M, carry out next step; Otherwise carry out traditional multicast, because carry out in this case traditional multicast, can save total power consumption.This threshold value M can rule of thumb arrange, and also can be determined by experiment, and can also determine by other means.
Second step, in two stages cooperations multicasts, base station is with transmitting power P
bS, C(N) carry out first stage cooperation multicast, the user under community receives from the signal of base station and decodes.
In this step, a part of user successfully receives base station signal, thereby becomes successfully user's (or claiming to receive successful user), and other users become unsuccessfully user's (or claiming to take defeat user) owing to could not successfully receiving base station signal.Wherein, the transmitting power P of base station
bS, C(N) can artificially set based on empirical value, or determine in the mode of experiment based on cell coverage, or determine by other means.
Successful user under the 3rd step, community is to base station transmitted signal, and it receives informing base station successfully.
Base station is after receiving signal, can determine that in community user, which is successfully user, thereby can in successful user, select certain customers to carry out second stage cooperation multicast, and all successful users need not be joined to the cooperation multicast of second stage, to save system power dissipation.
The 4th step, base station are selected trunk subscriber according to the distance between user for each failed user, and transmitted signal notify these users to participate in second stage cooperation multicast in go.
In one embodiment, base station can be its nearest successful user of each failed user's chosen distance.Therefore, before this step, the positional information of all users under community need to be collected in base station, is used for calculating the distance between user.And in other embodiments, base station can be for the nearer one or more successful user of each failed user's chosen distance be as relaying.
The 5th step, the successful user who receives signal outwards send data as relaying in the second stage of two stages cooperation multicast.
In this step, the failed user in the first stage receives the signal from all relayings, if its signal to noise ratio receiving is greater than the required signal to noise ratio of decoding, the failed user of this first stage receives successfully in second stage; Otherwise take defeat.
In one embodiment, before traditional multicast or the cooperation multicast of two stages are carried out in judgement, can take following methods to carry out the value of definite threshold M, its step comprises:
I, calculate the gross power of traditional multicast
Ensure cell coverage, the base station transmitting power of traditional multicast is a definite value, and the number of users under Gai Zhiyu community is irrelevant.And because having relaying, traditional multicast do not participate in, so this base station power just equals the gross power of traditional multicast.
User's number of II, supposition community is N.
III, the transmitting power P of base station in the first stage of two stages cooperations multicasts is set
bS, C, P wherein
bS, Cinitial value can be set to the base station transmitting power of traditional multicast,
1V, base station complete the base station multicast of first stage by this transmitting power.Then, for each the failed user in community, select a successful user to serve this failure user in second stage, this step can access the relaying number (being collaboration user number) of second stage.
As described above, user chosen successfully can select according to distance as collaboration user, for example a nearest successful user of chosen distance failure user provides service for it in second stage, can reduce relaying number like this, thereby saves the power consumption of second stage.
The process of V, repeating step IV, obtains an average relaying number N after calculating repeatedly relaying number
zj, the while can obtain the average coverage rate of community.The in the situation that in community, user's number being N, the two stages gross power of cooperation multicast can be expressed as:
Wherein, P
bS, C(N) be base station in the transmitting power of first stage, T
1for the time slot of first stage, T
2for the time slot of second stage, T is total time slot, P
mSfor successful user, in second stage, to failed user, send the power of data.
VI, increase base station transmitting power P
bS, Cand repeating IV, V, until the average coverage rate of community equals given coverage rate threshold value.Record base station transmitting power, average relaying number now, and the gross power of two stages cooperation multicast.
VII, variation community user number N, repeating step III-VI, thus obtain the corresponding different gross powers of different user number.If the gross power of the two stages cooperations multicasts that obtain is the gross power of traditional multicast of calculating in step I, the corresponding community user number of gross power of this two stages cooperation multicast is for judging whether to carry out the threshold value M of traditional multicast.
In judgement, enter after the cooperation multicast of two stages, guarantee system coverage rate, before carrying out first stage cooperation multicast, also will determine the transmitting power of base station in the first stage.In one embodiment, according to the number of users N under community and coverage rate threshold value C
th(the system coverage rate that will reach), determines the transmitting power P of base station in the first stage
bS, C(N) comprise the following steps:
A, first suppose that base station is P in the transmitting power of first stage.
B, base station complete the base station multicast of first stage by power P.Then, owing to may there being certain customers successfully to receive in community, certain customers' failure, now for each failed user, selects one apart from its nearest successful user, to be that it is in second stage service.Then, after the two stage transmission of process, in calculation plot, successful user accounts for total user's ratio, i.e. cell coverage.
The process of C, repeating step B, averages the cell coverage obtaining in these repetitive processes, thus the situation Xia community average coverage rate that to obtain at base station transmitting power be P.
D, change base station in the transmitting power of first stage, transmitting power repeating step B and C after changing based on this, thus obtain in the situation that community user number is N the corresponding community of different transmission power average coverage rate.If resulting community average coverage rate is given coverage rate threshold value C
th, its corresponding base station transmitting power is the transmitting power P that will calculate
bS, C(N).
In one embodiment, computational process is above carried out under can shifting to an earlier date online, and by the base station transmitting power P under the condition that is N in user's number
bS, C(N) store.Like this in practical operation, can be by tabling look-up to find corresponding base station transmitting power.
According to one embodiment of present invention, also provide a kind of two stages cooperation multicast system, comprise multicast device and trunking.
Wherein, multicast device is for being carried out the cooperation multicast of first stage to community user by base station.And trunking is for according to selecting successful user in failed user and the distance between successful user of first stage, and by selected successful user as relaying in the second stage multicast that cooperates.
For verifying the validity of two stage cooperation multicasting methods provided by the invention and system, inventor adopts respectively method provided by the invention, traditional multicasting method and existing two stages cooperation multicasting method to carry out emulation experiment, simulation parameter is as shown in table 1, wherein time slot T
1=T
2.
Table 1
| Main carrier | 2.5G |
| Bandwidth B | 10M |
| Path loss gain A from base station to user 1 | 2.3568×10 -2 |
| Path loss gain A from user to user 2 | 1.6672×10 -4 |
| Path loss factor gamma | 4 |
| Tradition multicast base station transmitting power P BS | 43dBm |
| User's transmitting power P MS | 21dBm |
| Noise spectrum density N 0 | -174dBm/Hz |
| Coverage rate threshold value C th | 95% |
| Radius of society R | 1500m |
| Multicast speed R one | 0.45bps/Hz |
Fig. 3 shows for different user's numbers, is ensureing that cell coverage reaches at 0.95 o'clock, cooperate with traditional multicast and the existing two stages comparison of system gross power of multicasting method of method provided herein.As can be seen from Figure 3, the multicasting method that cooperates with existing two stages is compared, and the gross power that adopts two stages cooperation multicasting method provided by the invention to consume has larger decline.And, in user's number, being greater than after some, two stages cooperation multicasting method provided by the invention is compared with traditional multicasting method, and gross power also has larger decline.
Fig. 4 shows for different user's numbers, is ensureing that cell coverage reaches at 0.95 o'clock, adopts the method provided by the invention relaying number of multicasting method in the second stage of multicast transmission that cooperate with existing two stages.As can be seen from Figure 4, compared with the conventional method, adopt two stages cooperation multicasting method provided by the invention can make relaying number decline to a great extent.
Should be noted that and understand, in the situation that not departing from the desired the spirit and scope of the present invention of accompanying claim, can make various modifications and improvement to the present invention of foregoing detailed description.Therefore, the scope of claimed technical scheme is not subject to the restriction of given any specific exemplary teachings.
Claims (10)
1. two stages cooperations multicasting methods, comprising:
Step 1), by base station, to community user, carry out first stage cooperation multicast;
Step 2) user and receive the distance between successful user of taking defeat, based on the first stage selects user as relaying to send data in second stage in the successful user of described reception.
2. method according to claim 1, wherein, step 2) comprising:
By the nearest reception success user of user that takes defeat described in the definite distance in described base station, select this to receive successful user; And
Transmitted signal notifies the successful user of selected reception to participate in second stage cooperation multicast.
3. method according to claim 1 and 2, wherein, step 1) also comprises:
Positional information by all users under collection community, described base station.
4. method according to claim 1 and 2, wherein, step 1) also comprises:
Reception success user by the described first stage sends the successful signal of indication reception to described base station.
5. method according to claim 1 and 2, also comprises:
Step 0), determine the transmitting power of described base station in the first stage.
6. method according to claim 5, wherein, step 0) comprising:
Step 01), transmitting power is set;
Step 02), described base station completes first stage cooperation multicast with this transmitting power, the distance taking defeat between user and the successful user of reception based on the first stage, in the successful user of described reception, select to send data in second stage, calculate the cell coverage after the cooperation multicast of two stages;
Step 03), repeating step 02), according to the cell coverage of each calculating, obtain community average coverage rate;
Step 04), change transmitting power and return to step 02) calculate community average coverage rate corresponding to this transmitting power, until resulting community average coverage rate is given coverage rate threshold value C
th, transmitting power corresponding to Jiang Gai community average coverage rate be the transmitting power in the first stage as described base station.
7. two stages cooperations multicasting methods, comprising:
Whether the number that judges community user is greater than threshold value M,
If be greater than threshold value M, carry out as the method as described in any one in claim 1-6;
Otherwise carry out traditional multicast.
8. method according to claim 7, is also included in before whether the number that judges community user be greater than threshold value M, according to following steps definite threshold M:
Step a), calculating are at given coverage rate threshold value C
thunder the gross power of traditional multicast;
Step b), community user number is set;
Step c), described base station is set at the transmitting power of the first stage of two stages cooperations multicasts, the base station transmitting power that its initial value is traditional multicast;
Step d), by described base station, complete first stage cooperation multicast, take defeat user and the distance receiving between successful user based on the first stage are selected, with in second stage transmission data, to obtain relaying number in the successful user of described reception;
Step e), repeating step d), according to the relaying number of each calculating, obtain average relaying number, according to average relaying number, obtain the gross power of two stages cooperation multicast, and add up community average coverage rate;
Step f), increase described base station in the transmitting power of the first stage of two stages cooperations multicasts and return to step d), until resulting community average coverage rate is given coverage rate threshold value C
th, the gross power of record two stages cooperation multicast is now the gross power of two stages cooperation multicast corresponding to this community user number;
Step g), change community user number and return to the gross power that step c) is calculated two stages cooperation multicast corresponding to this community user number, until the gross power that the gross power of resulting two stages cooperations multicasts is described traditional multicast, using community user number corresponding to the gross power of this two stages cooperation multicast as threshold value M.
9. method according to claim 8, in step e), according to following formula, calculate the gross power of two stages cooperation multicast:
Wherein, P
bS, C(N) be described base station in the transmitting power of first stage of two stages cooperation multicast, the community user number of N for arranging, T
1for the time slot of first stage, T
2for the time slot of second stage, T is total time slot, N
zjfor average relaying number, P
mSfor the successful user of selected reception sends the power of data in second stage.
10. two stages cooperations multicast systems, comprising:
Multicast device, for carrying out first stage cooperation multicast by base station to community user; With
Trunking for the user and receive the distance between successful user of taking defeat based on the first stage, selects user as relaying to send data in second stage in the successful user of described reception.
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