CN104105072A - Hybrid multicast method and hybrid multicast system - Google Patents
Hybrid multicast method and hybrid multicast system Download PDFInfo
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Abstract
The invention provides a hybrid multicast method and a hybrid multicast system. The hybrid multicast method comprises the following steps: dividing a plurality of terminals with the same business requirement in a cell into a plurality of initial clusters according to a preset clustering rule; selecting a target terminal serving as a cluster head in a corresponding initial cluster from the terminals in each initial cluster according to a cluster head selecting rule; receiving position information or channel quality information about each terminal in a corresponding initial cluster reported by the cluster head in each initial cluster; partitioning the cell into a first area and a second area according to the received position information or channel quality information; transmitting data to the terminals belonging to the first area in a multicast transmission way, and transmitting data to the terminals belonging to the second area in a straight-through transmission way according to the initial clusters. Through the technical scheme, the overhead is reduced during reporting of information, the multicast transmission efficiency is increased, and the robustness of a network is enhanced.
Description
Technical field
The present invention relates to terminal technology field, mix multicasting method and a kind of multicast system that mixes in particular to one.
Background technology
Increasing application need to send identical content to one group of user, traditional honeycomb Multicast Scheme is if MBMS is in order to meet covering demand, need to make the user of cell edge also can receive, thereby often need to adopt strong but lower MCS (the Modulation and Coding Scheme of efficiency of robustness, modulation coding mode), make the utilance of Internet resources lower, user's overall experience is not good enough.
The introducing of D2D (Device-to-device, the direct-connected communication of terminal) technology can be expanded the coverage area, and improves power system capacity, and D2D is combined with honeycomb multicast, has the potential ability that overcomes traditional multicast and be limited to the defect of edge customer.All report after relevant information all users, user is carried out sub-clustering by base station, and in bunch, the correct user who receives can provide relaying for other user.There is the user of all correct reception cellular datas of scheme hypothesis all to want (in same asset) relaying, there is scheme to suppose that only bunch head (but determines in advance, the best user of channel quality in being generally bunch) relaying, also have the relaying of the fixing or dynamic number of scheme hypothesis.
But there is following defect in existing scheme:
Honeycomb only scheme: performance is limited to the poorest user in community (or default multicast covers demand), does not utilize multi-user diversity gain, and adaptivity is poor.
Existing honeycomb+D2D hybrid plan:
1) require all reporting position information or channel measurement informations of all users, when sub-clustering simultaneously, send sub-clustering information need to all users, in the time that number of users is more, expense is larger.
2) base station how to confirm multicast transmission form is not described.And arranging of base station multicast transmission form has a significant impact the performance tool of whole scheme.
3) bunch, adopt orthogonal resource, evaded interference, but do not considered the spatial reuse of resource.
4) have the user of all correct reception cellular datas of scheme hypothesis all to want (in same asset) relaying, signaling consumption is little, and complexity is low, but device resource waste.There is only bunch head (but determine in advance, be generally bunch in the best user of channel quality) relaying of scheme hypothesis, existing problems: i) a bunch head differs and correctly receives surely, poor robustness.Ii) if bunch larger, performance or limited.And the situation of multiple relayings often needs iteration, complexity is high.
Therefore, need a kind of new technical scheme, in solving the problems of the technologies described above one of at least.
Summary of the invention
The present invention is just based on the problems referred to above, propose a kind of new technical scheme, can make the user of the direct-connected communication of terminal in being subject to network control, reduce expense, overcome traditional multicast and be limited to the defect of Cell Edge User, can dynamically determine bunch and bunch head the robustness of enhancing network simultaneously.
In view of this, the present invention proposes a kind of multicasting method that mixes, comprising: multiple terminals in community with identical services demand are divided into multiple initial cluster according to default sub-clustering rule; From multiple terminals of described each initial cluster, select target terminal according to a bunch selective rule, and using described target terminal bunch head in corresponding initial cluster; Receive positional information or the channel quality information of each terminal in the corresponding initial cluster that bunch head in described each initial cluster reports; According to the described positional information receiving or described channel quality information, described microzonation is divided into first area and second area; By multicast transmission mode to the terminal transmission data that belong in described first area, according to described initial cluster by direct-connected transmission means to the terminal transmission data that belong in described second area.
In this technical scheme, the terminal of concrete identical services demand in community is divided into multiple initial cluster according to default sub-clustering rule, the terminal room that ensures each initial cluster can direct communication, wherein, default sub-clustering rule includes, but are not limited to make the path loss of any two links in initial cluster to be not more than default loss value or signal to noise ratio is not less than default signal to noise ratio, thereby ensures suitable multicast speed.
From initial cluster, select a bunch head according to a bunch selective rule, by bunch a reporting position information and a channel quality information, like this, do not need the time scale cycle that each terminal reports and this process can be larger to carry out, do not need each Transmission Time Interval (TTI) to carry out, thereby can reduce greatly expense.
And microzonation is divided into two regions, and one is the region that can carry out multicast transmission, one is to carry out the direct-connected region of terminal, thereby adopts respectively multicast and direct-connected transmission means transmission data, has improved the efficiency of transmission of multicast.
In technique scheme, preferably, a described bunch of selective rule comprises: in the multiple terminals from described each initial cluster, select the terminal nearest from the center of described each initial cluster as described target terminal; Or in the multiple terminals from described each initial cluster, select the best terminal of channel quality as described target terminal; Or in the multiple terminals from described each initial cluster, select the nearest terminal in base station of the described community of distance as described target terminal.
In this technical scheme, a bunch selective rule can be in the terminal from each initial cluster, to select the terminal nearest from the center of initial cluster, can also be channel quality preferably or the terminal nearest apart from base station, thereby meet different transmission demands in ensureing data transmission quality, and according to a bunch selective rule Dynamic Selection bunch head, also strengthen the robustness of network.
In technique scheme, preferably, in described first area, at least comprise bunch head in described each initial cluster.
In this technical scheme, in order to ensure that the terminal in each initial cluster can receive transmission data, in the time carrying out region division, make at least to comprise in first area bunch head in initial cluster, like this, terminal in first area is directly served by base station, and the terminal in second area provides terminal direct-connected transmission by bunch head in initial cluster, in the efficiency that ensures to have improved in transmission data can arrive each terminal transfer of data.
In technique scheme, preferably, also comprise: judge whether each terminal correctly receives described transmission data; Be that arbitrary terminal is not while correctly receiving described transmission data in judged result, determine the target initial cluster that described arbitrary terminal is affiliated, and send data transfer request to the other-end that correctly receives described transmission data in described target initial cluster, send bunch information of described target initial cluster according to described data transfer request for described other-end to described base station; Resource and the transformat that described target initial cluster is used determined according to described bunch of information in described base station, and the resource of described use and described transformat is sent to bunch head of described target initial cluster; Described bunch of head is that described arbitrary terminal is carried out multitransmission according to the resource of described use and described transformat.
In this technical scheme, due to reasons such as wireless channel shade, decline time variations, the small part terminal of second area also can correctly receive transmission data with probability, and second area also has small part terminal (as 5%) can not correctly receive transmission data.The incorrect user who receives can select the user who correctly receives to provide D2D for it according to certain criterion (as distance, channel quality etc.).The terminal correctly receiving, according to the request of other terminal, forms D2D bunch.The user who receives request by bunch information (as bunch in the channel quality of poor link) reporting base station, by resource, the transformat etc. of each bunch of use of base station to determine.
In technique scheme, preferably, also comprise: rejudge described arbitrary terminal and whether receive described transmission data; Be that described arbitrary terminal is not while receiving described transmission data in judged result, judge whether to retransmit described transmission data by mode of unicast according to the current state information of described arbitrary terminal, wherein, described current state information comprises significance level information and current network state information.
In this technical scheme, for the terminal that does not receive yet transmission data by the direct-connected transmission of terminal, base station can determine whether be that it carries out unicast retransmission according to the information such as current network state and significance level of terminal.
According to a further aspect in the invention, also provide a kind of mixing multicast system, having comprised: sub-clustering unit, has been divided into multiple initial cluster by multiple terminals in community with identical services demand according to default sub-clustering rule; Selected cell is selected target terminal according to a bunch selective rule from multiple terminals of described each initial cluster, and using described target terminal bunch head in corresponding initial cluster; Receiving element, receives positional information or the channel quality information of each terminal in the corresponding initial cluster that bunch head in described each initial cluster reports; Region division unit, is divided into first area and second area according to the described positional information receiving or described channel quality information by described microzonation; Processing unit, the base station of controlling described community by multicast transmission mode to the terminal transmission data that belong in described first area, according to described initial cluster by direct-connected transmission means to the terminal transmission data that belong in described second area.
In this technical scheme, the terminal of concrete identical services demand in community is divided into multiple initial cluster according to default sub-clustering rule, the terminal room that ensures each initial cluster can direct communication, wherein, default sub-clustering rule includes, but are not limited to make the path loss of any two links in initial cluster to be not more than default loss value or signal to noise ratio is not less than default signal to noise ratio, thereby ensures suitable multicast speed.
From initial cluster, select a bunch head according to a bunch selective rule, by bunch a reporting position information and a channel quality information, like this, do not need the time scale cycle that each terminal reports and this process can be larger to carry out, do not need each TTI to carry out, thereby can reduce greatly expense.
And microzonation is divided into two regions, and one is the region that can carry out multicast transmission, one is to carry out the direct-connected region of terminal, thereby adopts respectively multicast and direct-connected transmission means transmission data, has improved the efficiency of transmission of multicast.
In technique scheme, preferably, a described bunch of selective rule comprises: in the multiple terminals from described each initial cluster, select the terminal nearest from the center of described each initial cluster as described target terminal; Or in the multiple terminals from described each initial cluster, select the best terminal of channel quality as described target terminal; Or in the multiple terminals from described each initial cluster, select the nearest terminal in base station of the described community of distance as described target terminal.
In this technical scheme, a bunch selective rule can be in the terminal from each initial cluster, to select the terminal nearest from the center of initial cluster, can also be channel quality preferably or the terminal nearest apart from base station, thereby in ensureing data transmission quality, meet different transmission demands.
In technique scheme, preferably, in described first area, at least comprise bunch head in described each initial cluster.
In this technical scheme, in order to ensure that the terminal in each initial cluster can receive transmission data, in the time carrying out region division, make at least to comprise in first area bunch head in initial cluster, like this, terminal in first area is directly served by base station, and the terminal in second area provides terminal direct-connected transmission by bunch head in initial cluster, in the efficiency that ensures to have improved in transmission data can arrive each terminal transfer of data.
In technique scheme, preferably, also comprise: the first judging unit, judges whether each terminal correctly receives described transmission data; Transmitting element, be that arbitrary terminal is not while correctly receiving described transmission data in judged result, determine the target initial cluster that described arbitrary terminal is affiliated, and send data transfer request to the other-end that correctly receives described transmission data in described target initial cluster, send bunch information of described target initial cluster according to described data transfer request for described other-end to described base station; Control unit, controls described base station and determines according to described bunch of information resource and the transformat that described target initial cluster is used; Described transmitting element also for: the resource of described use and described transformat being sent to bunch head of described target initial cluster, is that described arbitrary terminal is carried out multitransmission for described bunch of head according to the resource of described use and described transformat.
In this technical scheme, due to reasons such as wireless channel shade, decline time variations, the small part terminal of second area also can correctly receive transmission data with probability, and second area also has small part terminal (as 5%) can not correctly receive transmission data.The incorrect user who receives can select the user who correctly receives to provide D2D for it according to certain criterion (as distance, channel quality etc.).The terminal correctly receiving, according to the request of other terminal, forms D2D bunch.The user who receives request by bunch information (as bunch in the channel quality of poor link) reporting base station, by resource, the transformat etc. of each bunch of use of base station to determine.
In technique scheme, preferably, also comprise: the second judging unit, rejudges described arbitrary terminal and whether receive described transmission data; Determining unit, be that described arbitrary terminal is not while receiving described transmission data in judged result, determine whether to retransmit described transmission data by mode of unicast according to the current state information of described arbitrary terminal, wherein, described current state information comprises significance level information and current network state information.
In this technical scheme, for the terminal that does not receive yet transmission data by the direct-connected transmission of terminal, base station can determine whether be that it carries out unicast retransmission according to the information such as current network state and significance level of terminal.
By above technical scheme, by the initial cluster of the direct-connected communication of terminal and bunch head feedback, assistant base station arranges suitable multicast transmission form, then carry out the direct-connected multitransmission of terminal by cluster as required, can utilize multicast gain, multi-user's gain and the direct-connected gain of terminal simultaneously, can reduce feedback overhead, improved the efficiency of transmission of honeycomb multicast simultaneously.
Brief description of the drawings
Fig. 1 shows the flow chart that mixes according to an embodiment of the invention multicasting method;
Fig. 2 shows the block diagram that mixes according to an embodiment of the invention multicast system;
Fig. 3 shows the schematic diagram of initial network according to an embodiment of the invention;
Fig. 4 shows the schematic diagram of initial cluster according to an embodiment of the invention;
Fig. 5 shows the schematic diagram that region is divided according to an embodiment of the invention;
Fig. 6 shows according to an embodiment of the invention the schematic diagram of cluster as required.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Fig. 1 shows the flow chart that mixes according to an embodiment of the invention multicasting method.
As shown in Figure 1, mix according to an embodiment of the invention multicasting method, comprising: step 102, is divided into multiple initial cluster by multiple terminals in community with identical services demand according to default sub-clustering rule; Step 104 is selected target terminal according to a bunch selective rule from multiple terminals of described each initial cluster, and using described target terminal bunch head in corresponding initial cluster; Step 106, receives positional information or the channel quality information of each terminal in the corresponding initial cluster that bunch head in described each initial cluster reports; Step 108, is divided into first area and second area according to the described positional information receiving or described channel quality information by described microzonation; Step 110, by multicast transmission mode to the terminal transmission data that belong in described first area, according to described initial cluster by direct-connected transmission means to the terminal transmission data that belong in described second area.
In this technical scheme, the terminal of concrete identical services demand in community is divided into multiple initial cluster according to default sub-clustering rule, the terminal room that ensures each initial cluster can direct communication, wherein, default sub-clustering rule includes, but are not limited to make the path loss of any two links in initial cluster to be not more than default loss value or signal to noise ratio is not less than default signal to noise ratio, thereby ensures suitable multicast speed.
From initial cluster, select a bunch head according to a bunch selective rule, by bunch a reporting position information and a channel quality information, like this, do not need the time scale cycle that each terminal reports and this process can be larger to carry out, do not need each TTI to carry out, thereby can reduce greatly expense.
And microzonation is divided into two regions, and one is the region that can carry out multicast transmission, one is to carry out the direct-connected region of terminal, thereby adopts respectively multicast and direct-connected transmission means transmission data, has improved the efficiency of transmission of multicast.
In technique scheme, preferably, a described bunch of selective rule comprises: in the multiple terminals from described each initial cluster, select the terminal nearest from the center of described each initial cluster as described target terminal; Or in the multiple terminals from described each initial cluster, select the best terminal of channel quality as described target terminal; Or in the multiple terminals from described each initial cluster, select the nearest terminal in base station of the described community of distance as described target terminal.
In this technical scheme, a bunch selective rule can be in the terminal from each initial cluster, to select the terminal nearest from the center of initial cluster, can also be channel quality preferably or the terminal nearest apart from base station, thereby in ensureing data transmission quality, meet different transmission demands.
In technique scheme, preferably, in described first area, at least comprise bunch head in described each initial cluster.
In this technical scheme, in order to ensure that the terminal in each initial cluster can receive transmission data, in the time carrying out region division, make at least to comprise in first area bunch head in initial cluster, like this, terminal in first area is directly served by base station, and the terminal in second area provides terminal direct-connected transmission by bunch head in initial cluster, in the efficiency that ensures to have improved in transmission data can arrive each terminal transfer of data.
In technique scheme, preferably, also comprise: judge whether each terminal correctly receives described transmission data; Be that arbitrary terminal is not while correctly receiving described transmission data in judged result, determine the target initial cluster that described arbitrary terminal is affiliated, and send data transfer request to the other-end that correctly receives described transmission data in described target initial cluster, send bunch information of described target initial cluster according to described data transfer request for described other-end to described base station; Resource and the transformat that described target initial cluster is used determined according to described bunch of information in described base station, and the resource of described use and described transformat is sent to bunch head of described target initial cluster; Described bunch of head is that described arbitrary terminal is carried out multitransmission according to the resource of described use and described transformat.
In this technical scheme, due to reasons such as wireless channel shade, decline time variations, the small part terminal of second area also can correctly receive transmission data with probability, and second area also has small part terminal (as 5%) can not correctly receive transmission data.The incorrect user who receives can select the user who correctly receives to provide D2D for it according to certain criterion (as distance, channel quality etc.).The terminal correctly receiving, according to the request of other terminal, forms D2D bunch.The user who receives request by bunch information (as bunch in the channel quality of poor link) reporting base station, by resource, the transformat etc. of each bunch of use of base station to determine.
In technique scheme, preferably, also comprise: rejudge described arbitrary terminal and whether receive described transmission data; Be that described arbitrary terminal is not while receiving described transmission data in judged result, judge whether to retransmit described transmission data by mode of unicast according to the current state information of described arbitrary terminal, wherein, described current state information comprises significance level information and current network state information.
In this technical scheme, for the terminal that does not receive yet transmission data by the direct-connected transmission of terminal, base station can determine whether be that it carries out unicast retransmission according to the information such as current network state and significance level of terminal.
Fig. 2 shows the block diagram that mixes according to an embodiment of the invention multicast system.
As shown in Figure 2, mix according to an embodiment of the invention multicast system 200, comprising: sub-clustering unit 202, is divided into multiple initial cluster by multiple terminals in community with identical services demand according to default sub-clustering rule; Selected cell 204 is selected target terminal according to a bunch selective rule from multiple terminals of described each initial cluster, and using described target terminal bunch head in corresponding initial cluster; Receiving element 206, receives positional information or the channel quality information of each terminal in the corresponding initial cluster that bunch head in described each initial cluster reports; Region division unit 208, is divided into first area and second area according to the described positional information receiving or described channel quality information by described microzonation; Processing unit 210, the base station of controlling described community by multicast transmission mode to the terminal transmission data that belong in described first area, according to described initial cluster by direct-connected transmission means to the terminal transmission data that belong in described second area.
In this technical scheme, the terminal of concrete identical services demand in community is divided into multiple initial cluster according to default sub-clustering rule, the terminal room that ensures each initial cluster can direct communication, wherein, default sub-clustering rule includes, but are not limited to make the path loss of any two links in initial cluster to be not more than default loss value or signal to noise ratio is not less than default signal to noise ratio, thereby ensures suitable multicast speed.
From initial cluster, select a bunch head according to a bunch selective rule, by bunch a reporting position information and a channel quality information, like this, do not need the time scale cycle that each terminal reports and this process can be larger to carry out, do not need each TTI to carry out, thereby can reduce greatly expense.
And microzonation is divided into two regions, and one is the region that can carry out multicast transmission, one is to carry out the direct-connected region of terminal, thereby adopts respectively multicast and direct-connected transmission means transmission data, has improved the efficiency of transmission of multicast.
In technique scheme, preferably, a described bunch of selective rule comprises: in the multiple terminals from described each initial cluster, select the terminal nearest from the center of described each initial cluster as described target terminal; Or in the multiple terminals from described each initial cluster, select the best terminal of channel quality as described target terminal; Or in the multiple terminals from described each initial cluster, select the nearest terminal in base station of the described community of distance as described target terminal.
In this technical scheme, a bunch selective rule can be in the terminal from each initial cluster, to select the terminal nearest from the center of initial cluster, can also be channel quality preferably or the terminal nearest apart from base station, thereby in ensureing data transmission quality, meet different transmission demands.
In technique scheme, preferably, in described first area, at least comprise bunch head in described each initial cluster.
In this technical scheme, in order to ensure that the terminal in each initial cluster can receive transmission data, in the time carrying out region division, make at least to comprise in first area bunch head in initial cluster, like this, terminal in first area is directly served by base station, and the terminal in second area provides terminal direct-connected transmission by bunch head in initial cluster, in the efficiency that ensures to have improved in transmission data can arrive each terminal transfer of data.
In technique scheme, preferably, also comprise: the first judging unit 212, judges whether each terminal correctly receives described transmission data; Transmitting element 214, be that arbitrary terminal is not while correctly receiving described transmission data in judged result, determine the target initial cluster that described arbitrary terminal is affiliated, and send data transfer request to the other-end that correctly receives described transmission data in described target initial cluster, send bunch information of described target initial cluster according to described data transfer request for described other-end to described base station; Control unit 216, controls described base station and determines according to described bunch of information resource and the transformat that described target initial cluster is used; Described transmitting element 214 also for: the resource of described use and described transformat being sent to bunch head of described target initial cluster, is that described arbitrary terminal is carried out multitransmission for described bunch of head according to the resource of described use and described transformat.
In this technical scheme, due to reasons such as wireless channel shade, decline time variations, the small part terminal of second area also can correctly receive transmission data with probability, and second area also has small part terminal (as 5%) can not correctly receive transmission data.The incorrect user who receives can select the user who correctly receives to provide D2D for it according to certain criterion (as distance, channel quality etc.).The terminal correctly receiving, according to the request of other terminal, forms D2D bunch.The user who receives request by bunch information (as bunch in the channel quality of poor link) reporting base station, by resource, the transformat etc. of each bunch of use of base station to determine.
In technique scheme, preferably, also comprise: the second judging unit 218, rejudges described arbitrary terminal and whether receive described transmission data; Determining unit 220, be that described arbitrary terminal is not while receiving described transmission data in judged result, determine whether to retransmit described transmission data by mode of unicast according to the current state information of described arbitrary terminal, wherein, described current state information comprises significance level information and current network state information.
In this technical scheme, for the terminal that does not receive yet transmission data by the direct-connected transmission of terminal, base station can determine whether be that it carries out unicast retransmission according to the information such as current network state and significance level of terminal.
Describe technical scheme of the present invention in detail below in conjunction with Fig. 3 to Fig. 6.
Terminal 1～15 need to receive from network the business of identical content as shown in Figure 3, and all has D2D ability.
1) initial cluster: (in bunch, the path loss of arbitrary two links is not more than certain value or signal to noise ratio is not less than certain value to the terminal in community with identical services demand according to certain criterion, to ensure suitable multicast speed) be divided into multiple initial cluster, as shown in Figure 4, (as in Fig. 4, formed by terminal 1,2,3,4 bunch, formed by terminal 5,6,7 bunch, formed by terminal 8,11,12 bunch, formed by terminal 9,10 bunch, formed by terminal 13,14,15 bunch), ensure that the terminal room of each bunch can direct communication.From initial cluster, select a bunch head, wherein, the nearest terminal in Yi Licu center is as a bunch head in the present embodiment, as terminal 3,6,8,9 and terminal 13 in Fig. 4, there is bunch head to report its positional information or channel quality information to base station, in order to facilitate identification of base stations, can in the information reporting, add 1 bit indicating user is bunch head.Do not need so each user to report, and the time scale cycle that this process can be larger carry out, do not need each TTI to carry out, therefore can greatly reduce expense.
2) base station MCS selects: as shown in Figure 5, base station, according to the positional information or the channel quality information that report, is divided into inner region (being first area) and outer region (being second area) by community.Inner is directly served by base station in region; Outer region provides D2D transmission by the terminal in inner region.The MCS multi-case data that base station selected guarantee inner region covers.The system of selection of MCS is as follows:
If what a) report is positional information,
I) community is divided into N region (similar annulus by base station, not necessarily radius uniformly-spaced), according to the QoS of business (service quality) demand, shine upon corresponding MCS (obtaining by emulation or drive test) for each region, can be saved as form.Due to the existence of shade and decline, the close user's in geographical position channel condition also can differ greatly, and therefore supposes that the corresponding MCS in each region can general (as the probability with 95%) ensures the reception of the terminal of this regional center position.As long as community radio condition does not around have great fluctuation process, this step is without carry out at every turn.
Ii) selection can cover the MCS of the ring correspondence of bunch head farthest.
If what b) report is channel quality information, the MCS that the poorest bunch head of selective channel quality can receive.
3) as shown in Figure 6, wherein, the terminal of black represents correctly to receive the terminal of transmission data, the terminal of white represents correctly to receive the terminal of transmission data, visible, due to reasons such as wireless channel shade, decline time variations, the small part user in outer region also can correctly receive with probability (as the terminal 10 in Fig. 6), and inner region also has small part user (as 5%) can not correctly receive (as the terminal 3 in Fig. 6).The incorrect user's (comprising inner and outer) who receives selects the user's (comprising inner and outer, blue terminal) who correctly receives to provide D2D for it according to certain criterion (as distance, channel quality etc.).
4) user who correctly receives, according to other user's request, forms D2D bunch.The user who receives request by bunch information (as bunch in the channel quality of poor link) reporting base station, by base station to determine, the resource of each bunch of use, transformat.Distant bunch can resource multiplex (as in Fig. 6, formed by terminal 1,2,3,4 bunch and formed by terminal 13,14,15 bunch).D2D can multiplexing honeycomb upstream or downstream resource, also can distribute special resource.If multiplexing cell resource, the protection to phone user, can adopt existing scheme to realize, and does not repeat them here.
5) user (i.e. bunch head) of base station based on reporting information ID issues control information, and in bunch, all users are based on this ID decoding scheduling authorization message.Owing to not needing to send control information separately to each user, when bunch in number of users when more, can greatly save expense.
6) a bunch user uses the resource of base station assigns and transformat to carry out multitransmission.
7) user who correctly receives not yet, can have following three kinds of processing modes:
Mode 1: to base station feedback NACK (Negative ACKnowledgement, negative response), request base station retransmits by mode of unicast.
Mode 2: when packet loss exceedes certain thresholding, to base station feedback NACK, request base station retransmits by mode of unicast.
Mode 3: to base station feedback NACK, but base station determines whether retransmit according to some criterion (as user's significance level, current network state etc.).
More than be described with reference to the accompanying drawings technical scheme of the present invention, by technical scheme of the present invention, by the initial cluster of the direct-connected communication of terminal and bunch head feedback, assistant base station arranges suitable multicast transmission form, then carry out the direct-connected multitransmission of terminal by cluster as required, can utilize multicast gain, multi-user's gain and the direct-connected gain of terminal simultaneously, can reduce feedback overhead, improved the efficiency of transmission of honeycomb multicast simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. mix a multicasting method, it is characterized in that, comprising:
Multiple terminals in community with identical services demand are divided into multiple initial cluster according to default sub-clustering rule;
From multiple terminals of described each initial cluster, select target terminal according to a bunch selective rule, and using described target terminal bunch head in corresponding initial cluster;
Receive positional information or the channel quality information of each terminal in the corresponding initial cluster that bunch head in described each initial cluster reports;
According to the described positional information receiving or described channel quality information, described microzonation is divided into first area and second area;
By multicast transmission mode to the terminal transmission data that belong in described first area, according to described initial cluster by direct-connected transmission means to the terminal transmission data that belong in described second area.
2. mixing multicasting method according to claim 1, is characterized in that, a described bunch of selective rule comprises:
In multiple terminals from described each initial cluster, select the terminal nearest from the center of described each initial cluster as described target terminal; Or
In multiple terminals from described each initial cluster, select the best terminal of channel quality as described target terminal; Or
In multiple terminals from described each initial cluster, select the nearest terminal in base station of the described community of distance as described target terminal.
3. mixing multicasting method according to claim 1, is characterized in that, at least comprises bunch head in described each initial cluster in described first area.
4. according to the mixing multicasting method described in any one in claims 1 to 3, it is characterized in that, also comprise:
Judge whether each terminal correctly receives described transmission data;
Be that arbitrary terminal is not while correctly receiving described transmission data in judged result, determine the target initial cluster that described arbitrary terminal is affiliated, and send data transfer request to the other-end that correctly receives described transmission data in described target initial cluster, send bunch information of described target initial cluster according to described data transfer request for described other-end to described base station;
Resource and the transformat that described target initial cluster is used determined according to described bunch of information in described base station, and the resource of described use and described transformat is sent to bunch head of described target initial cluster;
Described bunch of head is that described arbitrary terminal is carried out multitransmission according to the resource of described use and described transformat.
5. mixing multicasting method according to claim 4, is characterized in that, also comprises:
Rejudge described arbitrary terminal and whether receive described transmission data;
Be that described arbitrary terminal is not while receiving described transmission data in judged result, judge whether to retransmit described transmission data by mode of unicast according to the current state information of described arbitrary terminal, wherein, described current state information comprises significance level information and current network state information.
6. mix a multicast system, it is characterized in that, comprising:
Sub-clustering unit, is divided into multiple initial cluster by multiple terminals in community with identical services demand according to default sub-clustering rule;
Selected cell is selected target terminal according to a bunch selective rule from multiple terminals of described each initial cluster, and using described target terminal bunch head in corresponding initial cluster;
Receiving element, receives positional information or the channel quality information of each terminal in the corresponding initial cluster that bunch head in described each initial cluster reports;
Region division unit, is divided into first area and second area according to the described positional information receiving or described channel quality information by described microzonation;
Processing unit, the base station of controlling described community by multicast transmission mode to the terminal transmission data that belong in described first area, according to described initial cluster by direct-connected transmission means to the terminal transmission data that belong in described second area.
7. mixing multicast system according to claim 6, is characterized in that, a described bunch of selective rule comprises:
In multiple terminals from described each initial cluster, select the terminal nearest from the center of described each initial cluster as described target terminal; Or
In multiple terminals from described each initial cluster, select the best terminal of channel quality as described target terminal; Or
In multiple terminals from described each initial cluster, select the nearest terminal in base station of the described community of distance as described target terminal.
8. mixing multicast system according to claim 6, is characterized in that, at least comprises bunch head in described each initial cluster in described first area.
9. according to the mixing multicast system described in any one in claim 6 to 8, it is characterized in that, also comprise:
The first judging unit, judges whether each terminal correctly receives described transmission data;
Transmitting element, be that arbitrary terminal is not while correctly receiving described transmission data in judged result, determine the target initial cluster that described arbitrary terminal is affiliated, and send data transfer request to the other-end that correctly receives described transmission data in described target initial cluster, send bunch information of described target initial cluster according to described data transfer request for described other-end to described base station;
Control unit, controls described base station and determines according to described bunch of information resource and the transformat that described target initial cluster is used;
Described transmitting element also for:
Bunch head that the resource of described use and described transformat is sent to described target initial cluster is that described arbitrary terminal is carried out multitransmission for described bunch of head according to the resource of described use and described transformat.
10. mixing multicast system according to claim 9, is characterized in that, also comprises:
The second judging unit, rejudges described arbitrary terminal and whether receives described transmission data;
Determining unit, be that described arbitrary terminal is not while receiving described transmission data in judged result, determine whether to retransmit described transmission data by mode of unicast according to the current state information of described arbitrary terminal, wherein, described current state information comprises significance level information and current network state information.
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