CN104768134A - MBSFN multicast resource scheduling method based on D2D relaying - Google Patents

MBSFN multicast resource scheduling method based on D2D relaying Download PDF

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CN104768134A
CN104768134A CN201510212785.3A CN201510212785A CN104768134A CN 104768134 A CN104768134 A CN 104768134A CN 201510212785 A CN201510212785 A CN 201510212785A CN 104768134 A CN104768134 A CN 104768134A
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user
relaying
multicast
group
users
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CN104768134B (en
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冷甦鹏
周剑云
杨建军
韦云凯
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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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
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses an MBSFN multicast resource scheduling method based on D2D relaying. The method specifically comprises the following steps that users are divided into users with poor channel quality and users with good signal quality, the users with the poor signal quality are in D2D connection with the users with the good signal quality, relaying resources are distributed to the users in D2D connection, multicast data are sent, and multicast resource scheduling is completed according to the distributed relaying resources. According to the MBSFN multicast resource scheduling method based on D2D relaying, an MBSFN and D2D are combined, all the users in a multicast group are divided into two parts, data are transmitted to the users with the good signal quality with low transmitting power, the resource needs of the users with the poor channel quality are guaranteed through relaying users and low relaying power, and therefore multicast resources are fully utilized, and the total energy consumption of the MBSFN is lowered.

Description

Based on the MBSFN multicast resource scheduling method of D2D relaying
Technical field
The invention belongs to multicast transmission techniques field, particularly relate to a kind of MBSFN (Multicast and Broadcast Single Frequency Network) multicast resource scheduling method based on D2D (Device-to-Device) relaying.
Background technology
Along with the fast development of mobile Internet application and the universal of increasing large-size screen monitors terminal, user is more and more stronger to the demand of a large amount of high bandwidth multimedia service, as video broadcasting, television advertising, online education, mobile phone news etc.These multimedia services are large to taking of bandwidth, duration is long, insensitive to time delay, normally certain area (commercial circle, subway, business premises etc.) multiple user receives identical data content simultaneously, therefore how efficient, high-quality in mobile communication system realize multicast service, be the current and following important research focus.
3GPP (3rd Generation Partnership Project) proposes multicast broadcast multimedia service (Multicast/Broadcast Multimedia Services in R6 (Release 6), MBMS) concept, in standard formulation afterwards, 3GPP has introduced again evolution MBMS (Evolved-MBMS, i.e. E-MBMs) standard, this standard is at logical architecture, business model, significant improvement has been carried out to MBMS in the aspects such as transmission means, in transmission means, wherein introduce multicast broadcast single frequency network (Multicast andBroadcast Single Frequency Network, MBSFN) transmission means.MBSFN utilizes same frequency to transmit identical business and brings good diversity, solves blind area covering problem, strengthens the reliability of reception.But although the transmission means of MBSFN enhances the performance of multicast service transmission, the Resourse Distribute due to multicast is subject to the restriction of the poorest user of channel quality, and the user that channel quality is good cannot make full use of channel resource.And MBSFN also can be subject to this restriction as the one of multicast transmission mode.
In MBSFN, all MBSFN communities use identical resource simultaneously with transmission multicast service frequently.If the poorest user distributes multicast resource according to channel quality, then the most poor channel quality user of each community will have influence on the Resourse Distribute of whole single frequency network.Such as, under the condition of given bandwidth and speed, for meeting the poorest user of channel quality, then base station needs higher transmitting power, and MBSFN is as the transmission means of multiple cell, and multiple community adopts high transmitting power, very large energy consumption can be produced, simultaneously also the communication of external community can cause interference.
Summary of the invention
Goal of the invention of the present invention is: in order to solve user in prior art cannot make full use of channel resource and power consumption excessive and cause the problems such as interference, the present invention proposes a kind of MBSFN multicast resource scheduling method based on D2D relaying.
Technical scheme of the present invention is: a kind of MBSFN multicast resource scheduling method based on D2D relaying, comprises the following steps:
A, utilize lowest energy consumption than user differentiating method, users all in multicast group are divided into the user of bad channel quality and the good user of signal quality;
B, utilize relaying matching process, user good with signal quality for the user of the poor signal quality distinguished in steps A is set up D2D and is connected;
C, utilize resource allocation methods, the user connected for setting up D2D in step B distributes relay resource;
D, transmission multi-case data, complete multicast resource scheduling according to the relay resource of distributing in step C.
Further, in described steps A, lowest energy consumption specifically comprises step by step following than user differentiating method:
S11, calculate the base station transmitting power of all users required under the condition of certain bandwidth with speed in multicast group;
S12, successively using the base station transmitting power that calculates in the step S11 actual emission power as base station, and to calculate at actual emission power P inumber of users R (the P of the transmission rate of business need can be reached down i), wherein, i is user's sequence number;
S13, according to the R (P calculated in step S12 i) and the transmitting power P of correspondence icalculate observable index;
Minimum value in the observable index calculated in S14, selecting step S13, and judge user with least energy consumption than corresponding actual emission power under whether can reach the transmission rate of business need; If user can reach the transmission rate of business need, then this user is the user that signal quality is good, if user can not reach the transmission rate of business need, then this user is the user of poor signal quality.
Further, the formula of described observable index is specially:
RATIO ( P i ) = P i R ( P i )
Wherein, | Ω | represent the total number of users of all receiving multicast traffics, v irepresent at transmitting power P iunder transmission rate, I (v i>v) if represent under certain transmitting power, the speed v that user i can reach iwhether be greater than the transmission rate v of business actual requirement, if be greater than, I=1, otherwise I=0.
Further, in described step B, relaying matching process specifically comprises step by step following:
S21, set and correctly can not receive the user of base station multicast service as U buser, the user that correctly can receive base station multicast service is U guser;
S22, will apart from each U bthe U that user is nearest guser as alternative relaying, and sets up minimum range form;
S23, calculate the Connected degree of each alternative relaying, and choose the U with maximum Connected degree guser is as a D2D relaying;
D24, according to the U chosen in step S23 guser, and all U corresponding in ultimate range buser sets up relaying group;
D25, by step S24 set up relaying group in U guser and U buser deletes from minimum range form, upgrades minimum range form and judges whether minimum range form is empty; If minimum range form is empty, then operate end, if minimum range form is not empty, then return step S23.
Further, in described step C, Resources allocation method specifically comprises step by step following:
S31, from the relaying group set up, choose a relaying group, and according to this relaying group selected distance repeater span farthest and not by three connected state users that other relaying group is multiplexing;
The maximum gain that S32, the resource utilizing this trunk subscriber to test three connected state users can reach, and choose the maximum resource of gain as multiplexed resource;
S33, to judge in relaying group whether also have relaying not complete distribution; If also have relaying not complete distribution in relaying group, then return step S31, if do not have relaying not complete distribution in relaying group, then end operation.
Further, described step D sends multi-case data, completes multicast resource scheduling, specifically comprise step by step following according to the relay resource of distributing in step C:
D1, multicast resource is divided into N number of group;
D2, send one group of multi-case data when transmitting time reaches, and complete multi-case data scheduling according to the relay resource of distributing;
Whether the group number that D3, judgement have sent is less than N; If the group number sent is less than N, then return step D2, if the group number sent is more than or equal to N, then complete multicast resource scheduling.
The invention has the beneficial effects as follows: the MBSFN multicast resource scheduling method based on D2D relaying of the present invention is by the combination of MBSFN and D2D, all users in multicast group are divided into two parts, lower transmitting power transmission data are used for the user base station that channel quality is good, and with lower relay power, resource requirement is ensured by trunk subscriber for the user of bad channel quality, thus take full advantage of multicast resource, and decrease the overall energy consumption of MBSFN; The uplink channel resources of the multiplexing honeycomb of repeated link in the present invention in addition, decrease the interference between relaying and phone user, the multiplexing different ascending resource of different relaying, eliminates the interference between different relaying group, meets the demand of repeated link further simultaneously.
Accompanying drawing explanation
Fig. 1 is the MBSFN multicast resource scheduling method schematic flow sheet based on D2D relaying of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, for of the present invention based on the MBSFN multicast resource scheduling method schematic flow sheet of D2D relaying.Based on a MBSFN multicast resource scheduling method for D2D relaying, comprise the following steps:
A, utilize lowest energy consumption than user differentiating method, users all in multicast group are divided into the user of bad channel quality and the good user of signal quality;
B, utilize relaying matching process, user good with signal quality for the user of the poor signal quality distinguished in steps A is set up D2D and is connected;
C, utilize resource allocation methods, the user connected for setting up D2D in step B distributes relay resource;
D, transmission multi-case data, complete multicast resource scheduling according to the relay resource of distributing in step C.
The present invention is by combining MBSFN and D2D, make base station that lower transmitting power can be used to meet the good user's request of channel quality, and also can reach quality of service guarantee by trunk subscriber with less relay power for the user of bad channel quality, thus reducing the overall energy consumption of MBSFN, the service quality of multicast service there has also been better guarantee simultaneously.
When needing to carry out MBSFN transmission when there being multicast service, the multicast control entity (MCE) of this MBSFN can add up the base station needing to transmit this business, and reception user under each base station and channel quality status thereof.Before a multicast service session start, MCE can be configured the Radio Resource of base station and user, MCE is configured according to the multicast cooperation Radio Resource of overall procedure to base station and user based on D2D relaying, thus determine the choosing of the transmitting power of base station, D2D relaying, relaying mates and relay power with bad channel quality user's.
In step, the present invention utilizes lowest energy consumption users all in multicast group to be divided into the user of bad channel quality and the good user of signal quality than user differentiating method, realizes covering multicast users as much as possible with alap transmitting power under not by the condition of the restriction of bad channel quality user.
Base station or MCE can according to the channel quality information of user feedback calculate all-multicast user given bandwidth and rate conditions under required base station transmitting power, the formula that base station transmitting power meets here is specially:
v = B log 2 ( 1 + SINR i ) SINR i = P i * D N 2 u
Wherein, SINR ibe the signal strength signal intensity that i-th user receives base station signal, the transmission rate of v required for multicast service, B is given transmission bandwidth, D n2ufor base station is to the channel quality parameter of user, P ifor base station for meet user i rate requirement required for transmitting power.
In order to cover multicast users as much as possible with alap transmitting power, invention defines observable index, the base station transmitting power that its implication is shared out equally for each user that can reach multicast service rate requirement, for whole system, when given multicast users quantity, base station transmitting power apportioned by user is fewer, then the power consumption that system is total is fewer.The formula of observable index is specially:
RATIO ( P i ) = P i R ( P i )
Wherein, | Ω | represent the total number of users of all receiving multicast traffics, v irepresent at transmitting power P iunder transmission rate, I (v i>v) implication is: if at transmitting power P iunder, the transmission rate v that user can reach iwhether be greater than the transmission rate v required for multicast service, if transmission rate v ibe greater than transmission rate v then I=1, otherwise I=0.
The present invention chooses the transmitting power that observable index can the be made minimum actual emission power as base station, thus make base station with the more user of less Power coverage, the user that cannot cover for base station then covers the user of all bad channel quality with less total relay power consumption by D2D relaying, thus reach the minimizing of MBSFN overall system energy consumption.
In the present invention, lowest energy consumption specifically comprises step by step following than user differentiating method:
S11, calculate the base station transmitting power of all users required under the condition of certain bandwidth with speed in multicast group;
S12, successively using the base station transmitting power that calculates in the step S11 actual emission power as base station, and to calculate at actual emission power P inumber of users R (the P of actual transfer rate can be reached down i), wherein, i is user's sequence number;
S13, according to the R (P calculated in step S12 i) and the transmitting power P of correspondence icalculate observable index;
Minimum value in the observable index calculated in S14, selecting step S13, and judge user with least energy consumption than corresponding actual emission power under whether can reach the actual transfer rate of business need; If user can reach the actual transfer rate of business need, then this user is the user that signal quality is good, if user can not reach the actual transfer rate of business need, then this user is the user of poor signal quality.
In step s 11, according to the channel quality information of user feedback each in multicast group calculate all-multicast user given bandwidth and rate conditions under required base station transmitting power.
In step s 12, the base station transmitting power that the present invention just calculates in step S11 carries out ascending order arrangement, and setting arrangement sequence number is 1,2,3...m; Then according to order from small to large successively using the base station transmitting power that calculates in the step S11 actual emission power as base station, and to calculate at actual emission power P inumber of users R (the P of actual transfer rate can be reached down i), wherein, i is user's sequence number, i ∈ [1, m].
In step s 13, respectively according to the R (P calculated in step S12 i) and the transmitting power P of correspondence icalculate observable index RATIO (P i).
In step S14, setting initial base station actual emission power P is P 1, the observable index of its correspondence is RATIO (P), then judges observable index RATIO (P from small to large successively i) whether be less than RATIO (P); If RATIO is (P i) be less than RATIO (P), then by RATIO (P i) be RATIO (P) as the observable index that the actual emission power P of base station is corresponding, and judge whether i is greater than m, if i is less than m, then continue to judge RATIO (P i+1) whether be less than RATIO (P), if i equals m, then judge this observable index RATIO (P i) be minimum value; If RATIO is (P i) be more than or equal to RATIO (P), then directly judge whether i is greater than m, if i is less than m, then continue to judge RATIO (P i+1) whether be less than RATIO (P), if i equals m, then judge observable index as RATIO (P) as minimum value; Thus the minimum value obtained in the observable index calculated in step S13; The actual transfer rate of each user will be calculated than corresponding actual emission power and channel quality parameter according to least energy consumption again, and judge whether the actual transfer rate of user can reach the transmission rate of business need; If user can reach the transmission rate of business need, then this user is the user that signal quality is good, if user can not reach the transmission rate of business need, then this user is the user of poor signal quality.Here the transmission rate of business need requires to carry out setting for the difference of transmission quality when transmitting according to multicast service.
In stepb, in order to reduce the energy consumption of MBSFN whole system, needing the relay power summation making selected relaying minimum, namely covering the user of all bad channel quality with less relaying and lower relay power.In order to reduce the power consumption of trunk subscriber as far as possible, the present invention utilizes relaying matching process, and user good with signal quality for the user of the poor signal quality distinguished in step 1 is set up D2D and is connected, relaying matching process specifically comprises step by step following here:
S21, set and correctly can not receive the user of base station multicast service as U buser, the user that correctly can receive base station multicast service is U guser;
S22, will apart from each U bthe U that user is nearest guser as alternative relaying, and sets up minimum range form;
S23, calculate the Connected degree of each alternative relaying, and choose the U with maximum Connected degree guser is as a D2D relaying;
D24, according to the U chosen in step S23 guser, and all U corresponding in ultimate range buser sets up relaying group;
D25, by step S24 set up relaying group in U guser and U buser deletes from minimum range form, upgrades minimum range form and judges whether minimum range form is empty; If minimum range form is empty, then operate end, if minimum range form is not empty, then return step S23.
In the step s 21, set and correctly can not receive the user of base station multicast service as U buser, the user that correctly can receive base station multicast service is U guser.
In step S22, in order to reduce the power consumption of trunk subscriber, the basis for selecting of the present invention using the distance between user as coupling, chooses and U as far as possible buser is at a distance of nearest U guser, as relaying, makes each relaying cover more bad channel quality user simultaneously as far as possible, and the member needing coupling is all U buser, has mated rear all U buser has assigned to different relaying groups, all U guser can as alternative relaying.Here the positional information of Consumer's Experience can be obtained by GPS or smart antenna.Will apart from U bthe U that user is nearest guser as alternative relaying, and sets up minimum range form, as shown in table 1.
Table 1. minimum range form
Wherein, "-" represents that this alternative relaying is not this U bthe nearest U that user is corresponding guser, this U of numeral wherein buser is to this U guser is beeline, and its distance is this numerical value.
In step S23, calculate the Connected degree of each alternative relaying, and choose the U with maximum Connected degree guser is as a D2D relaying.The calculating of Connected degree is specially: choose U gthe ultimate range number that user is expert at as coverage, all U under this coverage bthe quantity of user is this U gthe Connected degree of alternative relaying.
In step s 24 which, with the U chosen in step S23 guser-center, with this U gthe ultimate range that user is expert at as its coverage, with all U under this coverage bthe U at user and center guser sets up relaying group.
In step s 25, the U in relaying group step S24 set up guser and U buser deletes from minimum range form, upgrades minimum range form and judges whether minimum range form is empty; If minimum range form is empty, then illustrated that relaying is set up vertical, operation terminates, if minimum range form is not empty, then returns step S23, starts to set up next relaying group.Here minimum range form can constantly upgrade.
Relaying matching process of the present invention decreases the energy that the quantity of relaying and relaying consume to a certain extent, thus decreases D2D to power consumption when the multiplexing amount of ascending resource and D2D transmission.And then reduce the overall consumption of system.
Utilize relaying matching process, user good with signal quality for the user of the poor signal quality distinguished in step 1 is set up D2D and is connected, then by control channel, the result that relaying mates is informed to all U by base station buser and the U being chosen as relaying guser.
In step C, the resource that the multiplexing Cellular Networks of D2D link selection is up, therefore each multicast group needs the problem considering interference.When the ascending resource of the multiplexing phone user of D2D user, phone user can produce interference to the receiving terminal of D2D; Meanwhile, if multiplexing identical resource between adjacent D2D group, also mutually interference can be produced.Therefore, in the interference for needing consideration to weaken between D2D and Cellular Networks during D2D Resources allocation and between D2D group.Resource allocation methods of the present invention chooses ascending resource from relaying group trunk subscriber user farthest as the multiplexed resource of this relaying group, the interference of such phone user to D2D receiving terminal is minimum, secondly, multiplexing different ascending resource is selected, to reduce interference each other between different multicast group.Resources allocation method of the present invention specifically comprises step by step following:
S31, from the relaying group set up, choose a relaying group, and according to this relaying group selected distance repeater span farthest and not by three connected state users that other relaying group is multiplexing;
The maximum gain that S32, the resource utilizing this trunk subscriber to test three connected state users can reach, and choose the maximum resource of gain as multiplexed resource;
S33, to judge in relaying group whether also have relaying not complete distribution; If also have relaying not complete distribution in relaying group, then return step S31, if do not have relaying not complete distribution in relaying group, then end operation.
In step S31, from the relaying group set up, choose a relaying group, and according to the geographical position of user in this relaying group, selected distance repeater span is farthest and not by three connected state users that other relaying group is multiplexing.
In step s 32, the maximum gain that the resource utilizing this trunk subscriber to test three connected state users can reach, and choose the maximum resource of gain as multiplexed resource.Preferably, if the resource of a user is inadequate, can the resource of multiplexing multiple user, number of users is less than 3.
In step S33, judge in relaying group, whether to also have relaying not complete distribution; If also have relaying not complete distribution in relaying group, then return step S31, if do not have relaying not complete distribution in relaying group, then end operation.
Utilize resource allocation methods, for set up in step B D2D connect user distribute relay resource, then by base station the most at last allocation result inform all U buser and the U being chosen as relaying guser.
In step D, base station sends multi-case data, the user that channel quality is good directly receives the cast service data of base station, and bad channel quality user meets multicast service demand by the user being chosen as relaying with the mode relaying multi-case data of multicast according to the relay resource of distributing in step C, complete multicast resource scheduling.Specifically comprise step by step following:
D1, multicast resource is divided into N number of group;
D2, send one group of multi-case data when transmitting time reaches, and complete multi-case data scheduling according to the relay resource of distributing;
Whether the group number that D3, judgement have sent is less than N; If the group number sent is less than N, then return step D2, if the group number sent is more than or equal to N, then complete multicast resource scheduling.
Preferably, set duration T the present invention can also send multicast resource during in base station, after sending one group of multi-case data, judge whether transmitting time is greater than duration T; If transmitting time is less than the duration, then continue to send multi-case data, if transmitting time is more than or equal to the duration, then complete multicast resource scheduling.
The present invention, after completing multicast resource scheduling, needs the differentiation re-starting user, and re-starts relaying coupling and resource multiplex.This is because community user has mobility, it is generally acknowledged that community user moves at a slow speed, after often having passed N group data, the distribution of community user can change, and therefore, needs packet, and often passes N group data, just re-starts Resourse Distribute adjustment.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.

Claims (6)

1., based on a MBSFN multicast resource scheduling method for D2D relaying, it is characterized in that, comprise the following steps:
A, utilize lowest energy consumption than user differentiating method, users all in multicast group are divided into the user of bad channel quality and the good user of signal quality;
B, utilize relaying matching process, user good with signal quality for the user of the poor signal quality distinguished in steps A is set up D2D and is connected;
C, utilize resource allocation methods, the user connected for setting up D2D in step B distributes relay resource;
D, transmission multi-case data, complete multicast resource scheduling according to the relay resource of distributing in step C.
2., as claimed in claim 1 based on the MBSFN multicast resource scheduling method of D2D relaying, it is characterized in that, in described steps A, lowest energy consumption specifically comprises step by step following than user differentiating method:
S11, calculate the base station transmitting power of all users required under the condition of certain bandwidth with speed in multicast group;
S12, successively using the base station transmitting power that calculates in the step S11 actual emission power as base station, and to calculate at actual emission power P inumber of users R (the P of the transmission rate of business need can be reached down i), wherein, i is user's sequence number;
S13, according to the R (P calculated in step S12 i) and the transmitting power P of correspondence icalculate observable index;
Minimum value in the observable index calculated in S14, selecting step S13, and judge user with least energy consumption than corresponding actual emission power under whether can reach the transmission rate of business need; If user can reach the transmission rate of business need, then this user is the user that signal quality is good, if user can not reach the transmission rate of business need, then this user is the user of poor signal quality.
3., as claimed in claim 2 based on the MBSFN multicast resource scheduling method of D2D relaying, it is characterized in that, the formula of described observable index is specially:
RATIO ( P i ) = P i R ( P i )
Wherein, | Ω | represent the total number of users of all receiving multicast traffics, v irepresent at transmitting power P iunder transmission rate, I (v i>v) if represent under certain transmitting power, the speed v that user i can reach iwhether be greater than the transmission rate v of business actual requirement, if be greater than, I=1, otherwise I=0.
4., as claimed in claim 1 based on the MBSFN multicast resource scheduling method of D2D relaying, it is characterized in that, in described step B, relaying matching process specifically comprises step by step following:
S21, set and correctly can not receive the user of base station multicast service as U buser, the user that correctly can receive base station multicast service is U guser;
S22, will apart from each U bthe U that user is nearest guser as alternative relaying, and sets up minimum range form;
S23, calculate the Connected degree of each alternative relaying, and choose the U with maximum Connected degree guser is as a D2D relaying;
D24, according to the U chosen in step S23 guser, and all U corresponding in ultimate range buser sets up relaying group;
D25, by step S24 set up relaying group in U guser and U buser deletes from minimum range form, upgrades minimum range form and judges whether minimum range form is empty; If minimum range form is empty, then operate end, if minimum range form is not empty, then return step S23.
5., as claimed in claim 4 based on the MBSFN multicast resource scheduling method of D2D relaying, it is characterized in that, in described step C, Resources allocation method specifically comprises step by step following:
S31, from the relaying group set up, choose a relaying group, and according to this relaying group selected distance repeater span farthest and not by three connected state users that other relaying group is multiplexing;
The maximum gain that S32, the resource utilizing this trunk subscriber to test three connected state users can reach, and choose the maximum resource of gain as multiplexed resource;
S33, to judge in relaying group whether also have relaying not complete distribution; If also have relaying not complete distribution in relaying group, then return step S31, if do not have relaying not complete distribution in relaying group, then end operation.
6. as claimed in claim 4 based on the MBSFN multicast resource scheduling method of D2D relaying, it is characterized in that, described step D sends multi-case data, completes multicast resource scheduling, specifically comprise step by step following according to the relay resource of distributing in step C:
D1, multicast resource is divided into N number of group;
D2, send one group of multi-case data when transmitting time reaches, and complete multi-case data scheduling according to the relay resource of distributing;
Whether the group number that D3, judgement have sent is less than N; If the group number sent is less than N, then return step D2, if the group number sent is more than or equal to N, then complete multicast resource scheduling.
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