CN103428642B - Based on relaying bunch in D2D multicasting method - Google Patents
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Abstract
The present invention relates to a kind of based on relaying bunch in D2D multicasting method, comprising: S1: base station will have data sharing demand and the user that link loss is little is each other divided in one bunch; S2: base station by multicast will bunch in Data distribution8 inform each user, and control end-probing link information in each bunch; S3: in bunch, terminal node selects information multicast order based on the demand of each packet, and the packet occupation rate based on each user selects corresponding transmitting terminal, exchanges shared data by the mode of distributed multicast; S4: to be retransmitted by relaying with the user of transmitting terminal link-quality difference and obtain shared data.The invention provides the mode that a kind of relaying assists bunch internal information of multi-casting communication to share, overcome the large decline link of minority in multicast process to the impact of transmission rate, realize the optimization of network performance.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of based on relaying bunch in D2D multicasting method.
Background technology
Along with the development of 3GPP technology and multimedia service, emerge in large numbers a large amount of low energy consumption in network, possess the mobile terminal of calculating, memory function, data service presents the features such as variation, multimedization, mobility and position relevantization day by day.The development of business is had higher requirement to aspects such as the network optimization and managerial ability, network running quality, partner management ability, customer-oriented QOE and QOS.
Long Term Evolution (LTE, LongTermEvolution) system is a communication system based on scheduling.Under cellular communication modes, user to be obtained the authorization resource carry out transfer of data by control channel access base station (RNC/eNB).Because the information interchange between user needs by base station transfer, when great amount of terminals needs access network, request of data can be caused crowded, make base station face larger business challenge and pressure.Especially when data sharing and interaction demand, adopt and repeat a little to the communication mode of base station between a large number of users among a small circle, understand the serious waste network bandwidth.Multicast can improve efficiency of transmission and network performance.Under this pattern, base station utilizes to cluster the user in network with similar communication demand to gather in same bunch and serves.Such as when a large amount of sharing users terminal needs information exchanging data with one another time, base station is that each user distributes independently up channel (UL, UpLink) carry out data summarization, and then each user is given in multicast.But use traditional base station multicasting mode, can not alleviate the conflict of ascending resource under data sharing scene between user, serviced number of users can be restricted because of base station processing speed, ability.
D2D(Device-to-Device) information transmission communicated is without base station, and user can carry out direct communication by multiplexing up-downgoing authorization resources.The introducing of D2D technology can increase the availability of frequency spectrum, reduces load of base station, increases network throughput and coverage.But only utilize man-to-man D2D to communicate under data sharing service, not only can bring the redundant transmission of data, also can introduce D2D between interference.
For saving Internet resources, improving throughput, improving Consumer's Experience, when user has a data sharing demand among a small circle, the solution that main employing is following at present:
Buffer memory merges (cacheintergration): based on the visit capacity of terminal log certificate, cache node (cachepeer) stores the larger packet of interest-degree.If the packet that user needs is in memory range, user terminal is directly downloaded from buffer memory Nodes, otherwise still asks for base station.
D2D(Device-to-Device) multicast: base station assisting building bunch, each user serves as a bunch head in turn, realizes the information sharing between user by the mode of D2D multicast.Bunch head selects transmission rate according to the link-quality of multicast users.
The communication that above scheme takes full advantage of between terminal node improves network performance.Do not need base station (BS) to get involved due to the transmission between multi-user or assist signaling information only by BS transmission, the program can discharge downstream spectrum, reduce load of base station, makes more user access network.But above-mentioned data-sharing scheme exists user fairness sex chromosome mosaicism on the one hand: individual user's reception server function, pressure is large, and fairness is poor; On the other hand, multicast rate limits by the poorest link-quality, and the link of individual mass difference can affect overall efficiency of transmission.Based on this, relay transmission is incorporated in D2D multicast process, and method is as follows:
Mobile ad-hoc network (MANET): the mobile terminal in network has route and packet forwarding, the network information exchanges the packet switching mechanism that have employed in computer network, both can work alone as independent network, also can with the form of end subnet access existing network.
Traversal queries: according to node state, poll each node in base station, as the effect of relaying, under ensureing that user correctly receives the prerequisite of multicast information, selects suitable relaying to minimize total transmitting power.
Analyze such scheme, the introducing of route relaying increases efficiency of transmission, but brings extra route maintenance cost, adds consumption and the complexity of transmission.When service range is large, expense can be found for cost with above-mentioned relaying, solve the problems such as Transmission, and to increase within the scope of D2D bunch that efficiency of transmission is target, the relay selection algorithm that complexity is low is first-selection.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: provide a kind of relaying to assist the information sharing mode of multi-casting communication, in making bunch, each user having an independent information is mutual by data multicast, obtain bunch in exist whole resources, and overcome the large decline link of minority in multicast process to the impact of transmission rate, realize the optimization of network performance.
(2) technical scheme
The invention provides a kind of based on relaying bunch in D2D multicasting method, comprising: S1: base station will have data sharing demand and the user that link loss is little is each other divided in one bunch; S2: base station by multicast will bunch in Data distribution8 inform each user, and control end-probing link information in each bunch; S3: in bunch, terminal node selects information multicast order based on the demand of each packet, and the packet occupation rate based on each user selects corresponding transmitting terminal, exchanges shared data by the mode of distributed multicast; S4: to be retransmitted by relaying with the user of transmitting terminal link-quality difference and obtain shared data.
Preferably, by the situation signals base of bag that holds data while user sends data sharing request, and carry out link detection under base station controls, during the user that can carry out D2D communication joins bunch.
Preferably, user, under the auxiliary control in base station, obtains information of neighbor nodes and network packet distribution, builds small-world network model accordingly.
Preferably, described user is under the auxiliary control in base station, obtain information of neighbor nodes and network packet distribution, build small-world network model accordingly and comprise step: base station controls a bunch member and sends detectable signal, and new user monitors sounding channel, when received signal to noise ratio exceedes setting threshold thresholding, assert that sending user is self neighbour, data transmit-receive is realized by the directly transmission of point-to-point, otherwise, think that link-quality is poor, the relay forwarding that is conveyed through of information realizes.
Preferably, after each user access bunch, send detectable signal, in making bunch, user knows the renewal of neighbor information.
Preferably, base station completes after bunch user collects, will bunch in packet distribution inform each terminal, user can realize distributed transmission terminal and relaying is found accordingly.
Preferably, by the analysis of the distribution to data in network, the multicast order of the packet of distributed selection the best and transmission user.
Preferably, described by the analysis to Data distribution8 in network, the multicast order of the packet that distributed selection is best and transmission user comprise step: each user obtains consistent data sending order according to the distribution of packet and sends user: by packet according to demand descending, demand is larger, transmits priority higher; The selection of transmitting terminal based on the analysis data of holding bag user being enjoyed to rate, hold bag user to occupy data fewer, send priority higher.
Preferably, in bunch, the control of multicast is distributed, depends on the computing capability of each user.
Preferably, when not ensureing the link-quality of sending node and all users, the user of link-quality difference is retransmitted by relaying and obtains information, and the successively forwarding being conveyed through neighbor node of multi-hop realizes.
Preferably, it is described when the link-quality of sending node and all users can not be ensured, the user of link-quality difference is retransmitted by relaying and obtains information, the successively forwarding being conveyed through neighbor node of multi-hop realizes comprising step: the user not receiving information sends request of data to neighbor node, the neighbor node holding this packet adds up the number of requests self received, and feeds back to each request of data user; The terminal not receiving information accordingly selects the neighbor node can serving maximum user as relaying, namely again request of data is sent to the neighbor user receiving maximum request of data, each neighbor node is according to secondary request of data retransmission information: receive a request of data, just realizes D2D communication with mode of unicast; If receive multiple request of data, just provide packet with D2D multicast; If still have user to fail to obtain data, then repeat above-mentioned steps, served through multi-hop, the user being obtained by relaying serving is fed back to the multicast transmitting terminal of current data packet and successfully receives signaling.
Preferably, when multiple relay forwarding is simultaneous time, the transfer resource of multiplexed quadrature.
(3) beneficial effect
The invention provides the mode that a kind of relaying assists multi-casting communication bunch internal information to share, in making bunch, each user having an independent information is mutual by data multicast, obtain bunch in exist whole resources, and overcome the large decline link of minority in multicast process to the impact of transmission rate, realize the optimization of network performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to introduce simply apparently the accompanying drawing that uses required in embodiment or description of the prior art below, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the user bunch embodying small-world property.Wherein, bunch each user in contains independently information;
Fig. 2 is the scene schematic diagram that multiple relaying retransmits simultaneously;
Fig. 3 is the signalling schematic diagram that user accesses to base station requests;
Fig. 4 is the method flow diagram of the embodiment of the present invention.
Embodiment
In order to make the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1 to 4, the invention provides a kind of user's sub-clustering, and bunch in relaying assist the mode of multicast.Introduce small-world network model in this programme, in small-world network, user enjoys high polymerization degree and low linkage length, and each node has neighbor information and destination node information.When running into direct-connected unreachable link, the neighbor node be conveyed through successively of information forwards and realizes.This programme comprises the following steps:
S1: base station will have data sharing demand and the user that link loss is little is each other divided in one bunch, makes user in same cluster can realize stable D2D communication;
S2: base station by multicast will bunch in Data distribution8 inform each user, and control end-probing link information in each bunch, assist to build small-world network model;
S3: in bunch, terminal node selects information multicast order based on the demand of each packet, and the packet occupation rate based on each user selects corresponding transmitting terminal, exchanges shared data by the mode of distributed multicast;
S4: to be retransmitted by relaying with the user of transmitting terminal link-quality difference and obtain shared data.The selection of relaying is with under ensureing signal to noise ratio prerequisite, and maximization number of service subscribers is target.
Wherein, by the situation signals base of bag that holds data while user sends data sharing request, under base station controls, carry out link detection, during the user that can carry out D2D communication joins bunch.
Wherein, user, under the auxiliary control in base station, obtains information of neighbor nodes and network packet distribution, builds small-world network model accordingly.
Wherein, each user obtains the Data distribution8 in network by the broadcast of base station, and then learns the destination node of asking for data.
Wherein, by the analysis of the distribution to data in network, the multicast order of the packet of distributed selection the best and transmission user.Multicast process is controlled by Signalling exchange.
Wherein, in bunch, the control of multicast is distributed, depends on the computing capability of each user.
Wherein, when not ensureing the link-quality of sending node and all users, the user of link-quality difference is retransmitted by relaying and obtains information.The successively forwarding being conveyed through neighbor node of multi-hop realizes.
Wherein, when multiple relay forwarding is simultaneous time, the transfer resource of multiplexed quadrature.
The implementation of the embodiment of the present invention: the user with data sharing demand to build bunch according to network link status, by bunch in cooperate multicast transmission based on the D2D of relaying, ensureing the covering realizing multi-user's combined data under user fairness prerequisite.Comprise the steps:
S1: base station will have data sharing demand and the user that link loss is little is each other divided in one bunch, makes user in same cluster can realize stable D2D communication.
Data sharing user sends access request to base station, and self holds bag situation pack with signaling method informing base station
i, controlling terminal in lower bunch in base station and send detectable signal, after new user receives detection information, being uploaded to base station by accepting signal to noise ratio, accordingly, base station judges whether it can add current cluster:
If there be n user in current cluster, if the signal to noise ratio of n user that new user receives all is greater than setting threshold H
l, namely meet SNR
i, new>H
l,
then it can add current cluster; The signal to noise ratio received is greater than the user of H, SNR
i, new>H, i ∈ 1,2 ..., n} belongs to its neighbor user.
S2: base station by multicast will bunch in Data distribution8 inform each user, and control end-probing link information in each bunch, assist to build small-world network model.
After user's access bunch, under base station controls, send detection information, notify the existence of neighbor user self accordingly, make neighbor user upgrade local information.Neigh
irepresent the neighbor information of user i,
After the user of fixed time period collects, the combined data bag that network contains is learnt in base station,
and the distribution S of bag, there are N number of user and the individual different packet of M in suppose bunch:
B
ij=1 represents that a jth user has i-th bag, b
ij=0 represents not this packet.Base station this information to be handed down to bunch in user.
The above information structure local information of small-world network interior joint.Small-world network model may be used for the searching of relaying: when direct connected link is unreachable time, progressively forwarded by neighbor node, realize information transmission.
S3: in bunch, terminal node selects information multicast order based on the demand of each packet, and the packet occupation rate based on each user selects corresponding transmitting terminal, exchanges shared data by the mode of distributed multicast.
In bunch, all users grasp the distributed intelligence of bag, and each terminal node calculates the transmission sequence of identical bag and corresponding transmitting terminal accordingly.As follows:
The occupancy volume of each packet is obtained: K={k by analyzing S
1, k
2... k
m, wherein
represent the user's number containing i-th packet, the arrangement of it ascending order is obtained K', contrast K and K' information obtains the transmission sequence Q wrapped: make r get r the element arriving r the corresponding Q in the position of element in K in M, K' all over 1.
For q in Q
iindividual packet, looks for the principle of corresponding transmission user: hold in the user of this packet and hold bag and measure data that minimum node needs obtain from network at most, to even things up, we make it carry out multicast service.Q in traversal S
ioK, the user obtaining this packet gathers W={i
1, i
2..., i
c, i
1, i
2..., i
c≤ n, for element in W, calculates
find and make s
jnamely a minimum jth user is the transmitting terminal of this packet.Packet delivery order and corresponding transmission user form basic packet delivery information.
Each user is by calculating identical packet delivery information, and thus multicast process can by the interactive controlling process of signaling.In the broadcasting process of a packet, the user of data is not needed to keep mourning in silence.Send user and first send information access request, recipient detects received signal to noise ratio, and the user's (i.e. neighbor user) being greater than threshold value H selects directly to receive, and feedback link situation.Remaining user (i.e. non-neighbor user) does not feed back.Transmit leg according to the link information of user feedback adjustment multicast transmission speed, and is given tacit consent to each neighbor user and accurately can be received information.The non-neighbor user of transmitting terminal asks for packet at next time slot to self neighbor node, is retransmitted and is served, be the correct reception of guarantee information simultaneously, feed back to transmit leg ACK signaling information after making it receive packet by relaying.After transmit leg collects the ACK feedback of all non-neighbor users, notify that next transmission user starts next multicast process in the mode of signaling.With this, by the Signalling exchange between user and local information, realize the distributed AC servo system of multicast process.
For ensureing the correct reception of all users in multicast process, transmission rate is based on the poorest link path loss situation, and note U needs the user of packet i to gather, and k is the transmitting terminal selected, and considers channel gain g, D2D user and phone user transmitting power P
d, P
c, the interference Inf that D2D user receives, noise N and channel width B, utilize Shannon's theorems transmission rate can be expressed as:
After introducing relaying, the multicast rate of network improves:
S4: to be retransmitted by relaying with the user of transmitting terminal link-quality difference and obtain shared data.The selection of relaying is with under ensureing signal to noise ratio prerequisite, and maximization number of service subscribers is target.
When user directly can not obtain information from multicast process, packet can be asked for self neighbor node, and the re-transmission of neighbor user by the bag that holds data, obtain information.Retransmission processes is as follows: the terminal not receiving information sends request of data to neighbor user; After all neighbor users holding this packet receive solicited message, calculate the number of users self can served, and quantity information is fed back to each terminal sending request of data to self.The information that the terminal contrast neighbor user not receiving data feeds back, can serve the neighbor request information of maximum user simultaneously, and submit link condition to one; Neighbor node is according to the link condition fed back, and adjustment retransmits clean culture or multicast rate, carries out relaying re-transmission: if via node receives a data request information, then provide D2D unicast services; If receive multiple data request information, then send multicast service.
Receive the user feedback of packet to transmitting terminal ACK information.If still have user not receive packet, then get back to and send request of data step to neighbor user, find forward relay further at next time slot; After 2 relay request, still can not get the user of current data information to transmitting terminal request increasing power transmitting data bag.
Introduce after relaying, use DF(decodeandforward) mode transmits, and considers the SINR(signalandinterferencenoiseratio that relaying and terminal receive) SINR
r, SINR
d, receiving velocity is
As shown in Figure 2, when multiple relaying retransmits simultaneous time, for it distributes orthogonal multiplexed resource, to avoid the interference between D2D user.
The invention provides a kind of mode of carrying out user's sub-clustering and bunch internal information transmission according to interest-degree and distance feature.The optimization of network performance is realized eventually through multiple-user communication.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-described embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising above-described embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Use most it is noted that above embodiment is only for illustration of technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art are to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or equivalent replacement is carried out to portion of techniques feature wherein; And these amendments or replacement, the essence of appropriate technical solution departs from the spirit and scope of various embodiments of the present invention technical scheme frequently.
Claims (10)
1. based on relaying bunch in a D2D multicasting method, it is characterized in that, comprising:
S1: base station will have data sharing demand and the user that link loss is little is each other divided in one bunch;
S2: base station by multicast will bunch in Data distribution8 inform each user, and control end-probing link information in each bunch;
S3: in bunch, terminal node selects information multicast order based on the demand of each packet, and the packet occupation rate based on each user selects corresponding transmitting terminal, exchanges shared data by the mode of distributed multicast;
S4: to be retransmitted by relaying with the user of transmitting terminal link-quality difference and obtain shared data;
User, under the auxiliary control in base station, obtains information of neighbor nodes and network packet distribution, builds small-world network model accordingly;
Described user, under the auxiliary control in base station, obtains information of neighbor nodes and network packet distribution, builds small-world network model accordingly and comprises step:
Base station controls a bunch member and sends detectable signal, new user monitors sounding channel, when received signal to noise ratio exceedes setting threshold thresholding, assert that sending user is self neighbour, data transmit-receive is realized by the directly transmission of point-to-point, otherwise think that link-quality is poor, the relay forwarding that is conveyed through of information realizes.
2. the method for claim 1, is characterized in that, by the situation signals base of bag that holds data while user sends data sharing request, and carries out link detection under base station controls, during the user that can carry out D2D communication joins bunch.
3. the method for claim 1, is characterized in that, after each user access bunch, sends detectable signal, and in making bunch, user knows the renewal of neighbor information.
4. the method as described in claim 1 or 3, is characterized in that, base station completes after bunch user collects, will bunch in packet distribution inform each terminal, user can realize distributed transmission terminal and relaying is found accordingly.
5. the method for claim 1, is characterized in that, by the analysis of the distribution to data in network, and the multicast order of the packet of distributed selection the best and transmission user.
6. method as claimed in claim 5, is characterized in that, described by the analysis to the distribution of data in network, and the multicast order of the packet of distributed selection the best and transmission user comprise step:
Each user obtains consistent data sending order according to the distribution of packet and sends user: by packet according to demand descending, demand is larger, transmits priority higher; The selection of transmitting terminal based on the analysis data of holding bag user being enjoyed to rate, hold bag user to occupy data fewer, send priority higher.
7. the method as described in claim 5 or 6, is characterized in that, in bunch, the control of multicast is distributed, depends on the computing capability of each user.
8. the method for claim 1, is characterized in that, when not ensureing the link-quality of sending node and all users, the user of link-quality difference is retransmitted by relaying and obtains information, and the successively forwarding being conveyed through neighbor node of multi-hop realizes.
9. method as claimed in claim 8, it is characterized in that, described when not ensureing the link-quality of sending node and all users, the user of link-quality difference is retransmitted by relaying and obtains information, and the successively forwarding being conveyed through neighbor node of multi-hop realizes comprising step:
The user not receiving information sends request of data to neighbor node, and the neighbor node holding this packet adds up the number of requests self received, and feeds back to each request of data user; The terminal not receiving information accordingly selects the neighbor node can serving maximum user as relaying, namely again request of data is sent to the neighbor user receiving maximum request of data, each neighbor node is according to secondary request of data retransmission information: receive a request of data, just realizes D2D communication with mode of unicast; If receive multiple request of data, just provide packet with D2D multicast; If still have user to fail to obtain data, then repeat above-mentioned steps, served through multi-hop, the user being obtained by relaying serving is fed back to the multicast transmitting terminal of current data packet and successfully receives signaling.
10. method as claimed in claim 8 or 9, is characterized in that, when multiple relay forwarding is simultaneous time, and the transfer resource of multiplexed quadrature.
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| CN201310297127.XA CN103428642B (en) | 2013-07-16 | 2013-07-16 | Based on relaying bunch in D2D multicasting method |
| PCT/CN2013/089877 WO2015007058A1 (en) | 2013-07-16 | 2013-12-18 | Method for allocating spectrum resources between cellular subscriber and d2d subscriber in same cell |
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| CN106507489B (en) * | 2016-12-30 | 2019-12-10 | 宇龙计算机通信科技(深圳)有限公司 | resource allocation method and access device |
| CN107911824B (en) * | 2017-11-07 | 2021-12-14 | 曙光信息产业(北京)有限公司 | Dynamic spectrum allocation method and device |
| CN107820256B (en) * | 2017-11-14 | 2021-05-07 | 上海电机学院 | Data transmission method based on D2D regional distribution technology |
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| WO2013075340A1 (en) * | 2011-11-25 | 2013-05-30 | Renesas Mobile Corporation | Radio resource sharing and contention scheme for device-to-device communication in white space spectrum bands |
| CN103619024B (en) * | 2013-11-27 | 2016-07-06 | 无锡北邮感知技术产业研究院有限公司 | With the method that in community, between phone user and D2D user, frequency spectrum resource distributes |
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