CN113660065A - Multicast retransmission method and system in D2D communication - Google Patents
Multicast retransmission method and system in D2D communication Download PDFInfo
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Abstract
The invention relates to a multicast retransmission method in D2D communication, which comprises the following steps: the base station multicasts data to all the UEs in the D2D cluster, the cluster head receives the multicast data receiving state fed back by all the non-cluster-head UEs, and judges the states of all the D2D links according to the receiving state; the cluster head determines a retransmission scheme according to the states of all D2D links, and feeds back the retransmission scheme to the base station; and the base station allocates resources for retransmission according to the retransmission scheme and sends signaling to the UE participating in retransmission so that the UE participating in retransmission retransmits the multicast data. According to the invention, the problem of too large overhead of uplink report signaling in a centralized scheme is solved by the cluster head summary D2D multicast ACK state and intra-cluster link quality. Meanwhile, the cluster head determines the retransmission scheme and then reports the retransmission scheme to the base station, so that the problem of resource waste caused by resource reservation in the distributed retransmission scheme is solved.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a multicast retransmission method in power internet of things D2D communication, and further relates to a multicast retransmission system in power internet of things D2D communication.
Background
In order to comply with the trend of the integration and development of the energy revolution and the digital revolution, China proposes to build a ubiquitous power internet of things, and the ubiquitous power internet of things is used as a supplement of a strong smart grid and is also an important content for building an energy internet. In order to realize panoramic perception and ubiquitous access of various devices, personnel and high-performance power communication networks are required to serve as important supports for realizing transmission, transformation, distribution, use and adjustment in ubiquitous power internet of things, and extensive research has been carried out on domestic and foreign scholars. The fifth generation mobile communication (5G) is favored by various industries due to its advantages of high bandwidth, low time delay, low power consumption, etc., and is deeply integrated with the ubiquitous power internet of things. Part of the prior art has analyzed the application scenario of 5G communication in the ubiquitous power thing networking. The typical services of the 5G power Internet of things are generally divided into two categories of control and collection, wherein the collection category comprises low-voltage centralized reading, smart grid large video application of internal and external scenes of a station and the like, the collection object tends to be multimedia in the future, the collection content tends to be video and high-definition, the collection frequency tends to be quasi-real-time, and the evolution from one-way collection to two-way interaction is carried out.
To meet the requirements of these development trends, it is necessary to research corresponding new 5G communication technologies. The device-to-device communication (D2D) is a potential performance enhancement technology, and can support the application of the ubiquitous internet of things to mass measurement, audio and video maintenance work, even electric virtual reality and the like. D2D is an important technical approach to solve the problems of spectrum resource shortage and network burden increase caused by rapid increase of wireless network data volume, and it does not need a base station as a relay, and allows terminals to directly communicate by multiplexing wireless resources of the base station. The advantages of D2D technology are mainly reduced base station load, increased network throughput, capability of providing more reliable and larger capacity data transmission channel, etc.
In D2D multicasting, the base station can multicast the same packet to terminals in the entire cluster at a higher rate, which does not necessarily ensure correct reception by all terminals in the cluster. The terminals in the cluster that successfully receive can retransmit the data packet to the terminals that failed to successfully receive in a direct communication manner. Therefore, the multicast throughput can be greatly increased, and the short-distance link has better channel quality and can support high-speed retransmission, so that the spectrum efficiency of multicast transmission is greatly improved.
For the terminals in the cluster which cannot receive the data correctly, the corresponding data needs to be retransmitted. The specific retransmission process is as follows: firstly, a base station multicasts and transmits a group of data to an ad hoc network terminal in a corresponding area; secondly, the terminal which does not correctly receive the multicast data feeds back NACK (Negative Acknowledgement) to the base station, and the terminal which correctly receives the multicast data feeds back ACK (Acknowledgement) to the base station; and the terminal feeding back ACK to the base station is marked as ACK terminal, and the terminal feeding back NACK to the base station is marked as NACK terminal. And thirdly, retransmitting the required data packet to the terminal which feeds back the NACK by the cluster head.
The problems involved in the retransmission in the D2D cluster are: whether all ACK equipment terminals in the cluster participate in retransmission or only the cluster head retransmits data to the NACK terminal; and selecting retransmission to the NACK terminal by only one ACK terminal or retransmission to the NACK terminal by cooperation of a plurality of ACK terminals. For example, multiple terminals may be selected to use space-time coding or network coding to improve the retransmission success rate.
In the prior art, in a dynamic and semi-static scheduling mode in the LTE standard, a centralized retransmission scheme has too large signaling overhead in D2D multicast retransmission, and a distributed retransmission scheme has a problem of resource reservation waste.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a multicast retransmission method in D2D communication, and solves the technical problems that the signaling overhead of a centralized retransmission scheme is too large and the reserved resources are wasted in a distributed retransmission scheme in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme.
In a first aspect, the present invention provides a multicast retransmission method in D2D communication, including the following procedures:
the base station multicasts data to the UE in the D2D cluster, and the UE in the D2D cluster comprises cluster head UE and non-cluster head UE
The base station receives a retransmission scheme fed back by the cluster head UE, wherein the retransmission scheme is determined by the cluster head UE according to a receiving state fed back by the non-cluster head UE;
and the base station sends signaling to the UE participating in retransmission according to the retransmission scheme, so that the UE participating in retransmission retransmits the multicast data.
Optionally, the receiving state includes: and the data state is correctly received and the data state is incorrectly received, if the non-cluster-head UE feeds back an acknowledgement ACK, the data state is considered to be correctly received, and if the non-cluster-head UE feeds back a negative acknowledgement NACK and a channel quality information CQI, the data state is considered to be incorrectly received. .
Optionally, the retransmission scheme includes a retransmission transceiver terminal bitmap, and the retransmission transceiver terminal bitmap is used to specify a sender UE of the retransmission.
Optionally, the retransmission transceiving terminal bitmap is represented by a bitmap with the same number of bits as all UEs in the D2D cluster, and each bit value in the bitmap specifies whether the corresponding UE is the UE that is the sender of the retransmission.
Optionally, in the retransmission terminal bitmap, if a bit value is 1, it indicates that the corresponding UE is designated as a retransmission sender.
Optionally, the retransmission scheme includes a retransmission mode, and the retransmission mode is mode 2: the bitmap is needed, and the retransmission mode is that the ACK terminal specified by the bitmap performs D2D intra-cluster retransmission.
Optionally, the retransmission modes further include mode 0 and mode 1; wherein:
the mode 0: no bitmap is needed, and the retransmission mode is that all ACKs do not need to be retransmitted;
the mode 1: no bitmap is needed and the retransmission is such that all NACKs need to be retransmitted by the base station.
Optionally, the base station sends a signaling to the UE participating in the retransmission through a physical downlink control channel PDCCH.
In a second aspect, the present invention further provides a multicast retransmission method in D2D communication, including the following procedures:
respectively receiving multicast data by cluster head UE and non-cluster head UE in a D2D cluster;
the cluster head UE receives a receiving state fed back by the non-cluster head UE;
and the cluster head UE determines a retransmission scheme according to the receiving state fed back by the non-cluster head UE and feeds back the retransmission scheme to the base station.
In a third aspect, the invention further provides a multicast retransmission system in power internet of things D2D communication, including a D2D cluster composed of a base station and a plurality of UEs, where the UEs in the D2D cluster include cluster head UEs and non-cluster head UEs; the base station is connected and communicated with the UE through a physical control channel;
the base station is used for multicasting data to the UE in the D2D cluster, receiving a retransmission scheme fed back by the cluster head UE, and sending a signaling to the UE participating in retransmission according to the retransmission scheme, so that the UE participating in retransmission retransmits the multicast data;
the cluster head UE is used for receiving the receiving state fed back by the non-cluster head UE, determining a retransmission scheme according to the receiving state of the multicast data fed back by the non-cluster head UE, and feeding back the retransmission scheme to the base station.
Optionally, the retransmission scheme includes a retransmission transceiver terminal bitmap, and the retransmission transceiver terminal bitmap is used to specify a sender UE of the retransmission.
The system in the present invention is used for executing the method, and the specific processing procedure refers to the method, which is not described herein again.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the problem of too large overhead of uplink report signaling in a centralized scheme is solved by the cluster head summary D2D multicast ACK state and intra-cluster link quality. Meanwhile, the cluster head determines the retransmission scheme and then reports the retransmission scheme to the base station, so that the problem of resource waste caused by resource reservation in the distributed retransmission scheme is solved. The invention has certain reference significance for designing the D2D transmission technology of the 5G network.
Drawings
Fig. 1 is a schematic view of an on-site maintenance operation scenario supported by a 5G network D2D technology according to an embodiment;
fig. 2 is a schematic signaling process diagram of a centralized retransmission in the prior art according to an embodiment;
fig. 3 is a schematic signaling process diagram of a distributed retransmission in the prior art according to an embodiment;
fig. 4 is a schematic signaling process diagram of a retransmission scheme according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a multicast retransmission method in the power internet of things D2D communication according to an embodiment;
fig. 6 is a schematic diagram illustrating a comparison between signaling overhead of the present invention and a centralized scheme according to an embodiment;
FIG. 7 is a comparison of resource consumption performance provided by one embodiment;
fig. 8 is a diagram illustrating a comparison of retransmission times according to an embodiment.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In a field maintenance operation scene shown in fig. 1, a team of field maintenance workers are equipped with an audio/video communication terminal, in a maintenance field area, the team of field maintenance workers form a D2D cluster, a team leader serves as a cluster head, the team members can directly communicate with each other by using a D2D technology, and the team leader (cluster head) is responsible for collecting state information of a D2D link in the cluster and then reporting the state information to a base station. The maintenance and inspection staff are under the coverage of a 5G base station and are connected with a control center in an intelligent power grid application platform through dedicated channels configured in the 5G base station and a 5G core network, and a maintenance and inspection team reports the field condition to the control center through an audio and video communication terminal and receives remote command and operation guidance of a maintenance and inspection expert of the control center.
In the above scenario, the transmission of audio and video data requires a large amount of bandwidth, and it is suitable to transmit control center data to each dimension inspector in the D2D cluster by using multicast/broadcast.
D2D multicast retransmission is a resource scheduling problem, and 2 scheduling modes based on LTE, namely dynamic and semi-static scheduling modes, from the perspective of retransmission decision, there are 2 centralized and distributed retransmission schemes for corresponding retransmission schemes.
In centralized retransmission, the decision and resource allocation of retransmission are handled centrally by the base station, and the signaling process is shown in fig. 2. The UE in the cluster head or cluster reports ACK/NACK and CQI (Channel Quality Indication) to the base station, and the base station decides the intra-cluster D2D retransmission mode based on the information. The base station allocates retransmission resources for D2D and notifies all UEs through a PDCCH (Physical Downlink Control Channel). The advantage of this approach is that the control channel of the cellular network can be multiplexed, D2D is compatible with the UE of the cellular network; in addition the signalling delay is small. However, the base station needs the UEs in the D2D cluster to provide the ACK/NACK status of each UE and the CQI between each pair of UEs, which is a heavy burden on the uplink signaling of the cellular network. Assuming that a D2D cluster has N UEs, the cluster head collects CQI and ACK/NACK states of a D2D link and reports the states to a base station, and the ACK/NACK state is represented by 1bit, and the CQI is represented by 3 bits. The number of bits required for D2D signaling and cellular network signaling is shown in table 1.
Table 1 signalling overhead for centralized retransmission
| Type of signalling | Signaling | Number of bits |
| D2D signaling | ACK/NACK | N-1 |
| D2D signaling | |
3·N(N-1)/2 |
| Cellular network uplink signaling | ACK/NACK | N-1 |
| Cellular network uplink signaling | |
3·N(N-1)/2 |
In distributed retransmission, the UE in the cluster reports ACK/NACK and CQI information to the cluster head, and the cluster head determines the retransmission method, and the signaling process is shown in fig. 3. The advantage of this scheme is that no additional cellular network uplink signaling is required. However, this solution has 2 major drawbacks: firstly, an additional control channel is needed between a cluster head and UE in a cluster; secondly, the base station reserves resources for the D2D retransmission no matter whether the retransmission is necessary or not, which causes more serious resource waste. If all multicasts are successful, retransmission is not needed, if all multicasts are failed, the base station is needed to multicast again, and resource reservation is not needed. More importantly, because the D2D retransmission resources are not allocated according to the ACK/NACK and the CQI information of the D2D link, the MCS of the D2D retransmission should be decided according to the worst D2D link to ensure the retransmission is successful. For example, D1, D2 and D3 are 3 terminals within a cluster, D1 and D2 are ACK terminals, D3 is NACK terminals, and if the D1-D2 link is the worst, then the D2D retransmission can only occur on the D1-D3 or D2-D3 link. Then, the MCS (Modulation Coding Scheme) determined by D1-D2 obviously results in loss of transmission efficiency.
Aiming at the problems that signaling overhead of a centralized retransmission scheme is too large and reserved resources are wasted in a distributed retransmission scheme in the prior art, the invention provides a multicast retransmission method in power Internet of things D2D communication, which is recorded as a new scheme. The new scheme considers the link state in the D2D cluster, determines the corresponding retransmission scheme by the cluster head, and feeds back the preselected retransmission scheme to the base station for retransmission, and the signaling flow of the new proposed scheme is shown in fig. 4.
The multicast retransmission method in D2D communication according to the embodiment of the present invention includes the following steps:
s100, controlling a base station to multicast data to all the UEs in the D2D cluster, wherein the UEs comprise: cluster head UE and non-cluster head UE;
s200, the non-cluster-head UE feeds back a receiving state to the cluster-head UE, wherein the UE which correctly receives the data feeds back a confirmation response ACK, and the UE which does not correctly receive the data feeds back a negative response NACK and channel quality information CQI;
s300, judging the states of all D2D links by the cluster head UE according to the feedback of all non-cluster head UEs;
s400, the cluster head UE determines a retransmission scheme according to the states of all D2D links.
S500, the cluster head UE feeds back a retransmission scheme to the base station.
S600, the base station distributes resources for retransmission according to the retransmission scheme fed back by the cluster head UE, and sends signaling to the UE participating in retransmission through a physical downlink control channel PDCCH. And the UE participating in the retransmission retransmits the multicast data according to the signaling.
The cluster head determines a retransmission scheme and feeds back a selection result to the base station through a cellular network uplink control channel. The retransmission scheme specifically includes 3 items of content: retransmission mode, retransmission MCS, and retransmission transceiver terminal bitmap. The details of the protocol are described below.
Wherein, the retransmission MCS is an index of MCS format in retransmission and can be represented by 5 bits in the LTE system.
The retransmission transceiver terminal bitmap is used to specify the sender UE of the retransmission. Represented by a bitmap containing N bits, where N is the number of terminal UEs in the D2D cluster. If the nth bit value is 1, it means that the nth terminal UE is designated as a sender of the retransmission to retransmit the multicast data. For example, in a D2D cluster with 6 UEs, UE1 is a cluster head, UEs 1 to 3 are ACK terminals, and UEs 4 to 6 are NACK terminals. If the UE2 retransmits the multicast data to the UEs 4 to 6, the bitmap of the corresponding retransmission transmitting/receiving terminal is '010000', that is, the UE2 is designated as the retransmission sender, the UEs 4 to 6 are designated as the retransmission receivers, and the retransmission sender and the retransmission receivers are collectively referred to as UEs participating in the retransmission.
In this embodiment, the base station and the cluster head maintain a retransmission mode table, each retransmission mode in the table has a corresponding index value, and the tables of the two parties are kept identical. When the cluster head feeds back the retransmission mode to the base station, the index of the retransmission mode is fed back, and a retransmission receiver is determined.
In the scheme, 4 retransmission modes are defined, namely a mode 0, a mode 1, a mode 2 and a mode 3; the specific retransmission mode definition is shown in table 2. Wherein:
the mode 0: no bitmap is needed, and the retransmission mode is that all ACKs do not need to be retransmitted;
the mode 1: no bitmap is needed, and the retransmission mode is that all NACKs need to be retransmitted by the base station;
the mode 2: the bitmap is needed, and the retransmission mode is that the ACK terminal appointed by the bitmap carries out D2D cluster retransmission;
the mode 3 is as follows: a bitmap is needed and its retransmission is reserved and available for extension.
Table 2 retransmission mode definitions
| Retransmission mode | Retransmission method | Whether or not a bitmap is required |
| 0 | All ACKs without retransmission | Does not need to use |
| 1 | All NACKs, requiring base station retransmission | Does not need to use |
| 2 | D2D intra-cluster retransmission by ACK terminal designated by bitmap | Need to make sure that |
| 3 | Reserved, available for expansion | Need to make sure that |
The multicast retransmission scheme in the present invention selects mode 2. And the retransmission receiver is designated by the retransmission transceiving terminal bitmap, and the retransmission receiver is a NACK terminal.
In particular, in step S400, the cluster head may perform global optimal configuration on retransmission parameters in the cluster according to the link state fed back by each UE, adaptively select an optimal transmission node according to the link quality of D2D, avoid transmission bottleneck by reasonably selecting parameters such as retransmission mode, retransmission MCS, retransmission transceiving terminal, and the like, and fully utilize diversity gain of multiple channels in the cluster, thereby further improving retransmission efficiency.
Compared with a distributed mode, the scheme of the invention carries out link adaptation of D2D retransmission by the cluster head, does not need to allocate resources for D2D retransmission in advance, and avoids resource waste. In addition, the base station performs resource scheduling through cellular network control signaling, and additional signaling between the D2D cluster head and the UE is not required to be designed. Compared with a centralized method, the scheme has the additional cost that a retransmission mode table needs to be maintained by the base station and the cluster head, and the table size is small, so that the table has little influence on a memory. The method has the greatest advantage of great reduction in uplink signaling of the cellular network. The signaling overhead ratio of the new scheme to the localized retransmission is shown in table 3.
Table 3 signaling overhead comparison
The D2D signaling overhead required by the 2 schemes is the same, and is used for the terminal UE to aggregate ACK status and link status to the cluster head. Because parameters such as a retransmission mode and the like are fed back to the base station only by the cluster head, the uplink signaling overhead of the cellular network of the new scheme is greatly reduced compared with that of a centralized retransmission scheme. In the centralized scheme, the bit number of the cellular network uplink signaling is in direct proportion to the square of the number of the nodes in the cluster, the cellular network uplink signaling overhead of the new scheme is in direct proportion to the number of the nodes in the cluster, and the more the number of the nodes in the cluster is, the more obvious the advantage of the new scheme in the signaling overhead is.
The cellular network signaling overhead pair of the new scheme versus the centralized scheme is shown in figure 6. For example, when N is 4, 22 bits are needed for uplink signaling in a centralized manner, while only 11 bits are needed for the new scheme, and the overhead is only half of that of the centralized scheme. If N is 8, the signaling overhead of the centralized scheme is 92 bits, while the new scheme has only 15 bits, which is only 16% of the centralized scheme. If N is 10, the signaling overhead of the centralized scheme is 145 bits, while the new scheme has only 17 bits, which is only 12% of the centralized scheme. The more nodes in the cluster, the more obvious the signaling overhead advantage of the new scheme.
In order to verify the retransmission efficiency of the new scheme, a simulation experiment is performed by using Matlab. Without loss of generality, assuming that all terminals are uniformly distributed in a D2D cooperative cluster, small-scale fading of a D2D link is a slow-flattening Rayleigh fading model, and D2D communication between the terminals adopts an adaptive coding modulation technology to fully utilize channel capacity; the coded modulation format is divided into 15 stages in total.
In the simulation, the sizes of the D2D cooperative clusters were set to 4, 6, 10, and 16, respectively, to observe the effect of cooperative cluster size on algorithm performance. For each simulated cluster size, the D2D cooperative cluster (including terminal location and link quality) was randomly generated 10000 times, accounting for performance parameters.
The performance index of the retransmission efficiency is normalized resource consumption, and is defined as the time-frequency resource amount required for successfully retransmitting 1bit information to all NACK terminals in the cluster, and the unit is Hz.S. The resource consumption performance for the 3 retransmission schemes is shown in fig. 7, where the number of nodes in the cluster is 10. The abscissa is the proportion of terminals that feed back NACK when the base station multicasts, and varies from 10% to 90%. As can be seen from fig. 7, the new method proposed by the present invention is significantly superior to the centralized and distributed 2 retransmission schemes. With the increase of NACK terminals, the resource consumption is increased more in a centralized manner due to a larger amount of data to be reported, and the resource consumption is also increased with the increase of the number of terminals feeding back NACK due to the influence of reserved resources in a distributed scheme. The method provided by the invention overcomes the main factors of resource consumption in centralized and distributed modes, so that the resource consumption is the least in 3 schemes. In addition, since the proposed scheme can adaptively select the optimal retransmission parameter in step S400 of this embodiment, this embodiment also further improves the retransmission efficiency.
Comparing the average retransmission times (the average times of retransmission when 100 data packets are transmitted) of the 3 retransmission schemes when the nodes in the cluster are respectively 4, 6, 10 and 16 with fig. 8, it can be seen that the centralized retransmission times are the most, the distributed retransmission times are the least, and the retransmission times of the scheme provided by the present invention are the least. The reason is that the method has higher resource utilization rate, namely, signaling overhead is reduced, and data retransmission is carried out by means of better links among D2D nodes, so that the retransmission success rate is improved, and the retransmission times are reduced on the whole. As can be further seen from fig. 8, as the number of nodes in a cluster increases, the number of retransmissions correspondingly decreases, which embodies the advantage of D2D communication. In addition, the average transmission delay and the number of retransmissions of the 3 schemes have the same trend, which is not difficult to understand from the relationship between the average transmission delay and the number of retransmissions.
In summary, the method provides a new scheme based on retransmission mode preselection by analyzing the advantages and disadvantages of centralized and distributed 2 retransmission schemes transmitted by D2D, and avoids the problem of too large overhead of uplink report signaling in the centralized scheme by summarizing the ACK status and intra-cluster link quality through the cluster head D2D. Meanwhile, the cluster head determines the retransmission scheme and then reports the retransmission scheme to the base station, so that the problem of resource waste caused by resource reservation in the distributed retransmission scheme is solved. And the cluster head of the method fully considers the D2D link difference, and can self-adaptively select the optimal transmission node according to the D2D link quality, and fully utilize the multi-channel diversity gain of the D2D link. And the effectiveness of the scheme in the aspects of signaling overhead, transmission efficiency, average retransmission times and transmission time delay is verified by the theoretical analysis and the computer simulation of the method, and the method has certain reference significance for designing the 5G network D2D transmission technology.
Example 2
Based on the same inventive concept as that of the embodiment 1, the multicast retransmission system in the power internet of things D2D communication comprises a base station and a D2D cluster consisting of a plurality of UEs, wherein all the UEs in the D2D cluster are divided into cluster heads and non-cluster-head UEs; the base station is connected and communicated with the UE through a physical control channel;
the base station is used for multicasting data to all the UEs in the D2D cluster, allocating resources for retransmission according to a retransmission scheme, and sending a signaling to the UEs participating in retransmission to enable the UEs participating in retransmission to retransmit the multicast data;
the non-cluster-head UE is used for feeding back a multicast data receiving state to the cluster head;
and the cluster head UE is used for determining a retransmission scheme according to the multicast data receiving state fed back by all the non-cluster head UEs and feeding back the retransmission scheme to the base station.
Optionally, the retransmission scheme includes a retransmission transceiver terminal bitmap, and the retransmission transceiver terminal bitmap is used to specify a sender UE of the retransmission.
The system of the present invention is used for executing the method, and the functions and technical effects thereof refer to the method, which is not described herein again.
The specific implementation scheme of the system of the invention is shown in the specific implementation process of the method in the above embodiment 1.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A multicast retransmission method in D2D communication, characterized by comprising the following procedures:
the base station multicasts data to the UE in the D2D cluster, wherein the UE in the D2D cluster comprises cluster head UE and non-cluster head UE;
the base station receives a retransmission scheme fed back by the cluster head UE, wherein the retransmission scheme is determined by the cluster head UE according to a receiving state fed back by the non-cluster head UE;
and the base station sends signaling to the UE participating in retransmission according to the retransmission scheme, so that the UE participating in retransmission retransmits the multicast data.
2. The multicast retransmission method in D2D communication according to claim 1, wherein the receiving status includes: and the data state is correctly received and the data state is incorrectly received, if the non-cluster-head UE feeds back an acknowledgement ACK, the data state is considered to be correctly received, and if the non-cluster-head UE feeds back a negative acknowledgement NACK and a channel quality information CQI, the data state is considered to be incorrectly received.
3. The multicast retransmission method in D2D communication according to claim 1, wherein the retransmission scheme comprises a retransmission transceiver terminal bitmap, and the retransmission transceiver terminal bitmap is used for designating the UE as the sender of the retransmission.
4. The method of claim 3, wherein the retransmission transreceiving terminal bitmap is represented by a bitmap with the same number of bits as all UEs in the D2D cluster, and each bit value in the bitmap specifies whether the corresponding UE is the sender UE of the retransmission.
5. The method as claimed in claim 4, wherein the retransmission terminal bitmap indicates that the corresponding UE is designated as the retransmission sender if a bit value is 1.
6. The method of claim 3, wherein the retransmission scheme comprises a retransmission mode, and wherein the retransmission mode is mode 2: the bitmap is needed, and the retransmission mode is that the ACK terminal specified by the bitmap performs D2D intra-cluster retransmission.
7. The multicast retransmission method in D2D communication according to claim 6, wherein the retransmission modes further include mode 0, mode 1; wherein:
the mode 0: no bitmap is needed, and the retransmission mode is that all ACKs do not need to be retransmitted;
the mode 1: no bitmap is needed and the retransmission is such that all NACKs need to be retransmitted by the base station.
8. The method of claim 1, wherein the base station sends signaling to the UEs participating in the retransmission through a Physical Downlink Control Channel (PDCCH).
9. A multicast retransmission method in D2D communication, characterized by comprising the following procedures:
respectively receiving multicast data by cluster head UE and non-cluster head UE in a D2D cluster;
the cluster head UE receives a receiving state fed back by the non-cluster head UE;
and the cluster head UE determines a retransmission scheme according to the receiving state fed back by the non-cluster head UE and feeds back the retransmission scheme to the base station.
10. The multicast retransmission system in the D2D communication of the power Internet of things is characterized by comprising a D2D cluster formed by a base station and a plurality of UEs, wherein the UEs in the D2D cluster comprise cluster heads and non-cluster-head UEs; the base station is connected and communicated with the UE through a physical control channel;
the base station is used for multicasting data to the UE in the D2D cluster, receiving a retransmission scheme fed back by the cluster head UE, and sending a signaling to the UE participating in retransmission according to the retransmission scheme, so that the UE participating in retransmission retransmits the multicast data;
the cluster head UE is used for receiving the receiving state fed back by the non-cluster head UE, determining a retransmission scheme according to the receiving state fed back by the non-cluster head UE, and feeding back the retransmission scheme to the base station.
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