CN104768134B - MBSFN multicast resource scheduling methods based on D2D relayings - Google Patents
MBSFN multicast resource scheduling methods based on D2D relayings Download PDFInfo
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- CN104768134B CN104768134B CN201510212785.3A CN201510212785A CN104768134B CN 104768134 B CN104768134 B CN 104768134B CN 201510212785 A CN201510212785 A CN 201510212785A CN 104768134 B CN104768134 B CN 104768134B
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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
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- 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
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- 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
Abstract
The invention discloses a kind of MBSFN multicast resource scheduling methods based on D2D relayings；It specifically includes following steps：User is divided into the good user of user and signal quality of bad channel quality, the user of the poor signal quality user good with signal quality is established D2D to be connected, relay resource is distributed to establish the user of D2D connections, send multi-case data and multicast resource scheduling is completed according to the relay resource of distribution.The combination that the MBSFN multicast resource scheduling methods based on D2D relayings of the present invention pass through MBSFN and D2D, all users in multicast group are divided into two parts, for the user base station that channel quality is good data are transmitted using relatively low transmission power, and resource requirement is ensured with relatively low relay power by trunk subscriber for the user of bad channel quality, so as to take full advantage of multicast resource, and reduce the overall energy consumption of MBSFN.
Description
Technical field
The invention belongs to multicast transmission techniques fields more particularly to a kind of D2D (Device-to-Device) that is based on to relay
MBSFN (Multicast and Broadcast Single Frequency Network) multicast resource scheduling method.
Background technology
With the fast development of mobile Internet application and the popularization of more and more large-size screen monitors terminals, user is to a large amount of high
The demand of bandwidth multimedia services is more and more stronger, such as video broadcasting, television advertising, online education, mobile phone news.These are more
Media business is big to the occupancy of bandwidth, and the duration is long, insensitive to time delay, is typically some regional (commercial circle, subway, business
Building etc.) how in mobile communication system multiple users receive identical data content simultaneously, therefore efficient, high-quality realization
Multicast service is a current and following important research hot spot.
It is wide that 3GPP (3rd Generation Partnership Project) proposes multicast in R6 (Release 6)
The concept of playing multimedia service (Multicast/Broadcast Multimedia Services, MBMS), in standard afterwards
In formulation, 3GPP has introduced evolution MBMS (Evolved-MBMS, i.e. E-MBMs) standard again, and the standard is in logical architecture, business
Pattern, transmission mode etc. have carried out significant improvement to MBMS, wherein introducing multicast broadcast single frequency network in transmission mode
(Multicast and Broadcast Single Frequency Network, MBSFN) transmission mode.MBSFN utilizes phase
Same frequency transmits identical business and brings preferable diversity, solves blind area covering problem, strengthens the reliable of reception
Property.However, although the transmission mode of MBSFN enhances the performance of multicast service transmission, since the resource allocation of multicast is subject to
The limitation of the worst user of channel quality, the user that channel quality is good can not make full use of channel resource.And MBSFN is passed as multicast
The a kind of of defeated mode also can be limited.
In MBSFN, all MBSFN cells are using identical resource simultaneously with the transmission multicast service of frequency.If root
Multicast resource is distributed according to the worst user of channel quality, then the worst channel quality user of each cell will influence whether entire list
The resource allocation of frequency net.For example, under conditions of given bandwidth and rate, to meet the worst user of channel quality, then base station needs
Higher transmission power, transmission modes of the MBSFN as multiple cell are wanted, multiple cells use high transmission power, can generate very
Big energy consumption, at the same also can the communication of external cell interfere.
The content of the invention
The present invention goal of the invention be：Channel resource and power consumption mistake can not be made full use of in order to solve user in the prior art
The problems such as greatly and interfering, the present invention propose a kind of MBSFN multicast resource scheduling methods based on D2D relayings.
The technical scheme is that：A kind of MBSFN multicast resource scheduling methods based on D2D relayings, including following step
Suddenly：
A, using lowest energy consumption than user differentiating method, by all users in multicast group be divided into bad channel quality user and
The good user of signal quality；
B, using matching process is relayed, by the user for the poor signal quality distinguished in step A and the good user of signal quality
Establish D2D connections；
C, using resource allocation methods, relay resource is distributed to establish the user of D2D connections in step B；
D, multi-case data is sent, multicast resource scheduling is completed according to the relay resource distributed in step C.
Further, in the step A lowest energy consumption than user differentiating method specifically include it is following step by step：
S11, all users required base station transmitting power under conditions of certain bandwidth and rate in multicast group is calculated；
S12, successively using the base station transmitting power being calculated in step S11 as the actual emission power of base station, and count
It calculates in actual emission power PiNumber of users R (the P of the transmission rate of business need can be reached downi), wherein, i is user's sequence
Number；
S13, according to the R (P being calculated in step S12i) and its corresponding transmission power PiCalculate energy consumption ratio；
Minimum value of the energy consumption being calculated in S14, selecting step S13 than in, and judge user with least energy consumption ratio
Whether the transmission rate of business need can be reached under corresponding actual emission power；If user can reach the biography of business need
Defeated rate, then the user is the good user of signal quality, if user cannot reach the transmission rate of business need, the user
For the user of poor signal quality.
Further, the energy consumption than formula be specially：
Wherein,| Ω | represent the total number of users of all receiving multicast traffics, viExpression is emitting
Power PiUnder transmission rate, I (vi>If v) representing under certain transmission power, the rate v that user i can reachiWhether it is more than
The transmission rate v of business actual requirement, if more than then I=1, otherwise I=0.
Further, in the step B relay matching process specifically include it is following step by step：
S21, the user that cannot be properly received base station multicast service is set as UbUser can be properly received base station multicast service
User be UgUser；
S22, will be apart from each UbThe nearest U of usergUser alternately relays, and establishes minimum range form；
S23, each Connected degree alternatively relayed is calculated, and chooses the U with maximum Connected degreegUser is as a D2D
Relaying；
D24, according to the U chosen in step S23gCorresponding all U in user and its maximum rangebUser establishes relaying
Group；
U in D25, the relaying group for establishing step S24gUser and UbUser deletes from minimum range form, and update is most
Small distance form simultaneously judges whether minimum range form is empty；If minimum range form is sky, operation terminates, if minimum range
Form is not sky, then return to step S23.
Further, in the step C distribute resource allocation method specifically include it is following step by step：
S31, a relaying group is chosen from the relaying group of foundation, and it is farthest according to the relaying group selected distance repeater span
And three connected state users not being multiplexed by other relaying groups；
S32, the attainable maximum gain of resource institute that three connected state users are tested using the trunk subscriber, and choose increasing
Beneficial maximum resource is as multiplexed resource；
S33, judge whether to also have to relay in relaying group not completing distribution；If also having to relay in relaying group and not completing distribution,
Then return to step S31, if not completing distribution, end operation without relaying in relaying group.
Further, the step D sends multi-case data, and multicast resource is completed according to the relay resource distributed in step C
Scheduling, specifically include it is following step by step：
D1, multicast resource is divided into N number of group；
D2, one group of multi-case data is sent when sending time reaches, and multi-case data is completed according to the relay resource of distribution
Scheduling；
Whether the group number that D3, judgement have been sent is less than N；If the group number sent is less than N, return to step D2, if having sent out
The group number sent is greater than or equal to N, then completes multicast resource scheduling.
The beneficial effects of the invention are as follows：The MBSFN multicast resource scheduling methods based on D2D relayings of the present invention pass through
All users in multicast group are divided into two parts, made for the user base station that channel quality is good by the combination of MBSFN and D2D
Data are transmitted with relatively low transmission power, and are protected for the user of bad channel quality by trunk subscriber with relatively low relay power
Resource requirement is demonstrate,proved, so as to take full advantage of multicast resource, and reduces the overall energy consumption of MBSFN；In addition chain is relayed in the present invention
Road is multiplexed cellular uplink channel resources, reduces the interference between relaying and phone user, while different relaying multiplexings are different
Ascending resource, eliminate the interference between different relaying groups, further meet the demand of repeated link.
Description of the drawings
Fig. 1 is the MBSFN multicast resource scheduling method flow diagrams based on D2D relayings of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, the MBSFN multicast resource scheduling method flow diagrams based on D2D relayings for the present invention.It is a kind of
Based on the MBSFN multicast resource scheduling methods of D2D relayings, comprise the following steps：
A, using lowest energy consumption than user differentiating method, by all users in multicast group be divided into bad channel quality user and
The good user of signal quality；
B, using matching process is relayed, by the user for the poor signal quality distinguished in step A and the good user of signal quality
Establish D2D connections；
C, using resource allocation methods, relay resource is distributed to establish the user of D2D connections in step B；
D, multi-case data is sent, multicast resource scheduling is completed according to the relay resource distributed in step C.
The present invention is by the way that MBSFN and D2D are combined so that base station can meet channel using relatively low transmission power
The measured user demand of matter, and can also be reached for the user of bad channel quality by trunk subscriber with less relay power
Quality of service guarantee, so as to reduce the overall energy consumption of MBSFN, while the service quality of multicast service is protected there has also been better
Barrier.
When there is multicast service to need to carry out MBSFN transmission, the multicast control entity (MCE) of the MBSFN can count needs
Transmit the base station of the business and the reception user under each base station and its channel quality status.In a multicast service session
Before beginning, MCE can configure the radio resource of base station and user, and MCE cooperates overall according to the multicast relayed based on D2D
Flow configures the radio resource of base station and user, so that it is determined that the transmission power of base station, D2D relaying selection, in
After the matching with bad channel quality user and relay power.
In step, all users in multicast group are divided into channel by the present invention using lowest energy consumption than user differentiating method
Ropy user and the good user of signal quality, realize under conditions of the limitation from bad channel quality user with as far as possible
Low transmission power covers multicast users as much as possible.
Base station or MCE can according to the channel quality information of user feedback come calculate all-multicast user given bandwidth with
Required base station transmitting power under rate conditions institute, the formula that base station transmitting power meets here are specially：
Wherein, SINRiThe signal strength of base station signal is received for i-th of user, v is the required transmission speed of multicast service
Rate, B are to give transmission bandwidth, DN2uFor the channel quality parameter of base station to user, PiFor base station be meet user i rate will
Seek required transmission power.
In order to cover multicast users as much as possible with alap transmission power, invention defines energy consumption ratio,
Meaning is can each reach the base station transmitting power that the user of multicast service rate requirement is shared out equally, for whole system
For, in the case of given multicast users quantity, the base station transmitting power apportioned by user is fewer, then the total power of system disappears
Consumption is fewer.Energy consumption than formula be specially：
Wherein,| Ω | represent the total number of users of all receiving multicast traffics, viExpression is emitting
Power PiUnder transmission rate, I (vi>V) it is meant that：If in transmission power PiUnder, transmission rate v that user can reachiIt is
It is no to be more than the required transmission rate v of multicast service, if transmission rate viMore than transmission rate v then I=1, otherwise I=0.
The present invention chooses and enables to energy consumption than actual emission power of the minimum transmission power as base station, so that
Base station is with the more user of less Power coverage, and the user that can not be covered for base station is then relayed by D2D with less
Total relay power consumption covers the user of all bad channel qualities, so as to reach the reduction of MBSFN system overall energy consumptions.
In the present invention lowest energy consumption than user differentiating method specifically include it is following step by step：
S11, all users required base station transmitting power under conditions of certain bandwidth and rate in multicast group is calculated；
S12, successively using the base station transmitting power being calculated in step S11 as the actual emission power of base station, and count
It calculates in actual emission power PiNumber of users R (the P of actual transfer rate can be reached downi), wherein, i is user's sequence number；
S13, according to the R (P being calculated in step S12i) and its corresponding transmission power PiCalculate energy consumption ratio；
Minimum value of the energy consumption being calculated in S14, selecting step S13 than in, and judge user with least energy consumption ratio
Whether the actual transfer rate of business need can be reached under corresponding actual emission power；If user can reach business need
Actual transfer rate, then the user is the good user of signal quality, if user cannot reach the actual transmissions of business need
Rate, then the user is the user of poor signal quality.
In step s 11, all-multicast user is calculated according to the channel quality information of each user feedback in multicast group
The required base station transmitting power under given bandwidth and rate conditions.
In step s 12, the base station transmitting power that will be calculated in step S11 is carried out ascending order arrangement by the present invention, and
Setting arrangement serial number 1,2,3...m；Then according to the Base Transmitter that order will be calculated in step S11 successively from small to large
Actual emission power of the power as base station, and calculate in actual emission power PiThe user of actual transfer rate can be reached down
Amount R (Pi), wherein, i be user's sequence number, i ∈ [1, m].
In step s 13, respectively according to the R (P being calculated in step S12i) and its corresponding transmission power PiCalculate energy
Loss-rate RATIO (Pi)。
In step S14, initial base station actual emission power P is set as P1, corresponding energy consumption ratio is RATIO (P), so
Judge energy consumption than RATIO (P successively from small to large afterwardsi) whether it is less than RATIO (P)；If RATIO (Pi) be less than RATIO (P), then will
RATIO(Pi) as base station the corresponding energy consumption ratios of actual emission power P for RATIO (P), and judge whether i is more than m, if i is small
In m, then continue to judge RATIO (Pi+1) whether it is less than RATIO (P), if i is equal to m, judge the energy consumption than RATIO (Pi) for most
Small value；If RATIO (Pi) be greater than or equal to RATIO (P), then directly judge whether i is more than m, if i is less than m, continue to judge
RATIO(Pi+1) whether it is less than RATIO (P), if i is equal to m, judge that energy consumption ratio for RATIO (P) is minimum value；So as to be walked
Minimum value of the energy consumption being calculated in rapid S13 than in；It again will be according to least energy consumption than corresponding actual emission power and channel
Mass parameter calculates the actual transfer rate of each user, and judges whether the actual transfer rate of user can reach business and want
The transmission rate asked；If user can reach the transmission rate of business need, the user is the good user of signal quality, if with
Family cannot reach the transmission rate of business need, then the user is the user of poor signal quality.Here the transmission of business need
Rate is set according to different requirements of the multicast service when being transmitted for transmission quality.
In stepb, in order to reduce the energy consumption of MBSFN whole systems, it is necessary to so that the relay power summation of selected relaying
At least, i.e., the user of all bad channel qualities is covered with less relaying and relatively low relay power.In order to reduce relaying to the greatest extent
The power consumption of user, the present invention is using matching process is relayed, by the user for the poor signal quality distinguished in step 1 and signal matter
Measured user establishes D2D connections, here relay matching process specifically include it is following step by step：
S21, the user that cannot be properly received base station multicast service is set as UbUser can be properly received base station multicast service
User be UgUser；
S22, will be apart from each UbThe nearest U of usergUser alternately relays, and establishes minimum range form；
S23, each Connected degree alternatively relayed is calculated, and chooses the U with maximum Connected degreegUser is as a D2D
Relaying；
D24, according to the U chosen in step S23gCorresponding all U in user and its maximum rangebUser establishes relaying
Group；
U in D25, the relaying group for establishing step S24gUser and UbUser deletes from minimum range form, and update is most
Small distance form simultaneously judges whether minimum range form is empty；If minimum range form is sky, operation terminates, if minimum range
Form is not sky, then return to step S23.
In the step s 21, the user that cannot be properly received base station multicast service is set as UbUser can be properly received base station
The user of multicast service is UgUser.
In step S22, in order to reduce the power consumption of trunk subscriber, the present invention is using the distance between user as matching
Basis for selecting, as far as possible choose and UbUser is at a distance of nearest UgUser makes each relaying covering more as far as possible as relaying
Bad channel quality user, it is necessary to matched member be all UbUser, all U after the completion of matchingbUser assigned to it is different in
After group, all UgUser can serve as alternatively relaying.Here the location information of user experience can pass through GPS or intelligence
Antenna obtains.It will distance UbThe nearest U of usergUser alternately relays, and establishes minimum range form, as shown in table 1.
1. minimum range form of table
Wherein, "-" represents that the alternative relaying is not the UbThe corresponding nearest U of usergUser, the digital representation therein Ub
User is to the UgUser is beeline, and distance is the numerical value.
In step S23, each Connected degree alternatively relayed is calculated, and chooses the U with maximum Connected degreegUser's conduct
One D2D relaying.The calculating of Connected degree is specially：Choose UgThe maximum range number that user is expert at is as coverage, at this
All U under coveragebThe quantity of user is the UgThe Connected degree alternatively relayed.
In step s 24, the U to be chosen in step S23gUser-center, with the UgThe maximum range that user is expert at is made
For its coverage, with all U under the coveragebUser and the U at centergUser establishes relaying group.
In step s 25, the U in relaying group step S24 establishedgUser and UbUser deletes from minimum range form
It removes, update minimum range form and judges whether minimum range form is empty；If minimum range form is sky, illustrate in completion
Vertical after setting up, operation terminates, if minimum range form is not sky, return to step S23 begins setting up next relaying group.This
In minimum range form can constantly be updated.
The energy that the relaying matching process of the present invention reduces the quantity of relaying to a certain extent and relaying is consumed,
So as to reduce power consumption when D2D transmits the multiplexing amount and D2D of ascending resource.And then the totality for reducing system disappears
Consumption.
Using matching process is relayed, the user for the poor signal quality distinguished in step 1 user good with signal quality is built
Vertical D2D connections, then matched result will be relayed by control channel by base station and notified to all UbUser and the U for being chosen as relayingg
User.
In step C, D2D link selections are multiplexed the resource that honeycomb is surfed the net, therefore each multicast group is required for considering
The problem of interference.When D2D user is multiplexed the ascending resource of phone user, phone user can generate interference to the receiving terminal of D2D；
Meanwhile if being multiplexed identical resource between adjacent D2D groups, it also can mutually generate interference.Therefore, needed when distributing resource for D2D
Consider to weaken the interference between D2D and Cellular Networks and between D2D groups.The resource allocation methods of the present invention are chosen from relaying group
Multiplexed resource of the ascending resource of the farthest user of trunk subscriber as the relaying group, such phone user is to D2D receiving terminals
Interference is minimum, secondly, the different ascending resource of selection multiplexing between different multicast groups, to reduce mutual interference.This hair
Bright distribution resource allocation method specifically include it is following step by step：
S31, a relaying group is chosen from the relaying group of foundation, and it is farthest according to the relaying group selected distance repeater span
And three connected state users not being multiplexed by other relaying groups；
S32, the attainable maximum gain of resource institute that three connected state users are tested using the trunk subscriber, and choose increasing
Beneficial maximum resource is as multiplexed resource；
S33, judge whether to also have to relay in relaying group not completing distribution；If also having to relay in relaying group and not completing distribution,
Then return to step S31, if not completing distribution, end operation without relaying in relaying group.
In step S31, a relaying group is chosen from the relaying group of foundation, and according to the geography of user in the relaying group
Position, selected distance repeater span are farthest and not by three connected state users of other relaying groups multiplexing.
In step s 32, the attainable maximum gain of resource institute of three connected state users is tested using the trunk subscriber,
And the resource of gain maximum is chosen as multiplexed resource.Preferably, if the resource of a user is inadequate, multiple users can be multiplexed
Resource, number of users be less than 3.
In step S33, judge whether to also have to relay in relaying group not completing distribution；If also relaying is not complete in relaying group
Ingredient is matched somebody with somebody, then return to step S31, if not completing distribution, end operation without relaying in relaying group.
Using resource allocation methods, relay resource is distributed to establish the user of D2D connections in step B, then it is final by base station
Allocation result is notified to all UbUser and the U for being chosen as relayinggUser.
In step D, base station sends multi-case data, and the user that channel quality is good directly receives the multicast service number of base station
According to, and bad channel quality user according to the relay resource distributed in step C be chosen as relaying user in a manner of multicast
Multi-case data is relayed to meet multicast service demand, completes multicast resource scheduling.Specifically include it is following step by step：
D1, multicast resource is divided into N number of group；
D2, one group of multi-case data is sent when sending time reaches, and multi-case data is completed according to the relay resource of distribution
Scheduling；
Whether the group number that D3, judgement have been sent is less than N；If the group number sent is less than N, return to step D2, if having sent out
The group number sent is greater than or equal to N, then completes multicast resource scheduling.
Preferably, the present invention can also set duration T when base station sends multicast resource, send one group of multi-case data
After judge sending time whether be more than duration T；If sending time is less than the duration, continue to send multicast number
According to if sending time completes multicast resource scheduling more than or equal to the duration.
The present invention is after multicast resource scheduling is completed, it is necessary to re-start the differentiation of user and re-start relaying
Match somebody with somebody and resource multiplex.This is because community user has mobility, it is considered that community user moves slowly at, and has been passed every
After N group data, the distribution of community user can change, and therefore, it is necessary to by packet, and often pass N group data, just again into
Row resource allocation adjusts.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.This field
Those of ordinary skill these disclosed technical inspirations can make according to the present invention and various not depart from the other each of essence of the invention
The specific deformation of kind and combination, these deform and combine still within the scope of the present invention.
Claims (5)
1. a kind of MBSFN multicast resource scheduling methods based on D2D relayings, which is characterized in that comprise the following steps：
A, using lowest energy consumption than user differentiating method, all users in multicast group are divided into user and the signal of bad channel quality
The measured user of matter；Lowest energy consumption than user differentiating method specifically include it is following step by step：
S11, all users required base station transmitting power under conditions of certain bandwidth and rate in multicast group is calculated；
S12, successively using the base station transmitting power being calculated in step S11 as the actual emission power of base station, and calculate and exist
Actual emission power PiNumber of users R (the P of the transmission rate of business need can be reached downi), wherein, i is user's sequence number；
S13, according to the R (P being calculated in step S12i) and its corresponding transmission power PiCalculate energy consumption ratio；
Minimum value of the energy consumption being calculated in S14, selecting step S13 than in, 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 speed of business need
Rate, then the user is the good user of signal quality, if user cannot reach the transmission rate of business need, the user is letter
Number ropy user；
B, using matching process is relayed, the good user of the user for the poor signal quality distinguished in step A and signal quality is established
D2D connections；
C, using resource allocation methods, relay resource is distributed to establish the user of D2D connections in step B；
D, multi-case data is sent, multicast resource scheduling is completed according to the relay resource distributed in step C.
2. the MBSFN multicast resource scheduling methods as described in claim 1 based on D2D relayings, which is characterized in that the energy consumption
The formula of ratio is specially：
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Wherein,| Ω | represent the total number of users of all receiving multicast traffics, viIt represents in transmission power PiUnder
Transmission rate, I (vi＞ v) if representing under certain transmission power, the rate v that user i can reachiWhether business is more than real
The transmission rate v of border requirement, if more than then I=1, otherwise I=0.
3. the MBSFN multicast resource scheduling methods as described in claim 1 based on D2D relayings, which is characterized in that the step
In B relay matching process specifically include it is following step by step：
S21, the user that cannot be properly received base station multicast service is set as UbUser can be properly received the use of base station multicast service
Family is UgUser；
S22, will be apart from each UbThe nearest U of usergUser alternately relays, and establishes minimum range form；
S23, each Connected degree alternatively relayed is calculated, and chooses the U with maximum Connected degreegUser relays as a D2D；
S24, according to the U chosen in step S23gCorresponding all U in user and its maximum rangebUser establishes relaying group；
U in S25, the relaying group for establishing step S24gUser and UbUser deletes from minimum range form, updates most narrow spacing
From form and judge whether minimum range form is empty；If minimum range form is sky, operation terminates, if minimum range form
It is not sky, then return to step S23.
4. the MBSFN multicast resource scheduling methods as claimed in claim 3 based on D2D relayings, which is characterized in that the step
In C distribute resource allocation method specifically include it is following step by step：
S31, a relaying group is chosen from the relaying group of foundation, and farthest and is not had according to the relaying group selected distance repeater span
There are three connected state users being multiplexed by other relaying groups；
S32, the attainable maximum gain of resource institute that three connected state users are tested using the trunk subscriber, and choose gain most
Big resource is as multiplexed resource；
S33, judge whether to also have to relay in relaying group not completing distribution；If also having to relay in relaying group and not completing distribution, return
Step S31 is returned, if not completing distribution, end operation without relaying in relaying group.
5. the MBSFN multicast resource scheduling methods as claimed in claim 3 based on D2D relayings, which is characterized in that the step
D sends multi-case data, and multicast resource scheduling is completed according to the relay resource distributed in step C, specifically include it is following step by step：
D1, multicast resource is divided into N number of group；
D2, one group of multi-case data is sent when sending time reaches, and multi-case data scheduling is completed according to the relay resource of distribution；
Whether the group number that D3, judgement have been sent is less than N；If the group number sent is less than N, return to step D2, if sent
Group number is greater than or equal to N, then completes multicast resource scheduling.
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| CN108770034B (en) * | 2018-05-17 | 2020-06-02 | 浙江工业大学 | Low-energy-consumption multicast method for device-to-device multicast cluster in wireless cellular network |
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