CN112994759A - Cooperative relay D2D communication method based on OFDM - Google Patents

Cooperative relay D2D communication method based on OFDM Download PDF

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CN112994759A
CN112994759A CN202110153511.7A CN202110153511A CN112994759A CN 112994759 A CN112994759 A CN 112994759A CN 202110153511 A CN202110153511 A CN 202110153511A CN 112994759 A CN112994759 A CN 112994759A
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special
relay
ofdm
communication
transmitter
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CN202110153511.7A
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CN112994759B (en
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蒋林
王斌
王文鼐
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Nanjing University of Posts and Telecommunications
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Nanjing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Abstract

The invention discloses a cooperative relay D2D communication method based on OFDM, which comprises the steps that a remote D2D pair carries out data relay communication through a special D2D pair, a special D2D pair multiplexes a plurality of resources and serves as relay equipment, and a plurality of available resources are utilized to carry out signal transmission based on OFDM; the frame structure of the communication system is divided into two time slots with equal length, in the odd time slot, the special D2D transmitter can send signals and receive relay forwarding signals, and in the even time slot, the special D2D transmitter sends self transmission signals and relay forwarding signals based on OFDM. According to the invention, the D2D user is selected as the relay equipment of the remote D2D pair, so that the problem that D2D communication cannot be carried out due to distance limitation can be effectively solved, and the access quantity of the system D2D is effectively increased; the OFDM technology can fully utilize the condition that one D2D multiplexes a plurality of cellular resources, effectively improves the utilization efficiency of the spectrum in the system on the premise of ensuring the communication quality of the special D2D serving as a relay, and has wide practical value and application prospect.

Description

Cooperative relay D2D communication method based on OFDM
Technical Field
The invention relates to wireless communication, in particular to a cooperative relay D2D communication method based on OFDM.
Background
With the rapid development of information technology and the explosive growth of the number of multimedia smart devices, and the online use of various multimedia applications, and accompanied with high requirements for communication service quality, delay and rate, the existing communication means and communication resources have difficulty in coping with and providing the real demands of users. D2D communication is one of the technical components of the 5G architecture, and is a communication mode in which data transmission can be directly performed between a neighboring device and a device without data forwarding through a base station. As shown in fig. 1, D2D can directly perform short-distance communication for users by multiplexing cellular user resources, thereby greatly reducing the number of data processing and forwarding times of the base station, and greatly increasing the utilization rate of spectrum resources, thereby increasing the total throughput of the system, expanding the network capacity, reducing the power consumption, and ensuring the Qos of user communication.
The communication frequency band used by D2D is a telecommunication authorized frequency band, and the base station can control the transmission power, mode selection and resource reuse of the user. The resource used for D2D communication may be the communication resource of a shared cellular user or may occupy a communication channel alone. In general, there are three modes of communication for D2D: dedicated mode, cellular mode, and shared mode (reuse mode), but shared mode is the most commonly used one, and the shared mode can greatly improve the spectrum utilization efficiency and improve the cell communication capacity.
In the multiplexing mode, the case of multiplexing resources can be classified into a one-to-one multiplexing mode and a many-to-one multiplexing mode. As shown in fig. 2, the users D2D all adopt the multiplexing mode, the users D2D _1 multiplex the resources of the cellular user CUE _1, and the users D2D _2 and D2D _3 jointly multiplex the resources of the cellular user CUE _ 2. Compared with a one-to-one multiplexing mode, the many-to-one multiplexing mode can enable the system to accommodate more communication users, and further improves the spectrum utilization rate of the system. In the many-to-one resource multiplexing mode, the D2D users may be resource multiplexed by grouping, and the grouping may control the interference among the D2D users as little as possible. In the grouping process, some D2D pairs can perform resource multiplexing in a plurality of cellular user resource blocks, but in the actual multiplexing process, one D2D traffic multiplexing one resource block can complete the communication task, thereby causing the waste of the frequency spectrum in the system. The D2D communication can reduce the load of the base station due to its short-distance direct communication, but when the distance between the devices is relatively large, the communication quality of the two devices cannot be guaranteed, and even the two devices may not be connected, which may affect the communication performance of the whole system when there is available resource.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the defects that D2D users cannot directly communicate due to long distance and the problem of frequency waste, and provides a cooperative relay D2D communication method based on OFDM, which improves the access quantity of a system D2D and ensures the communication quality of special D2D users.
The technical scheme is as follows: a cooperative relaying D2D communication method based on OFDM, the long-distance D2D pair carries on the data relay communication through the special D2D pair, the special D2D pair multiplexes a plurality of resources and acts as the relay equipment, utilize a plurality of available resources to carry on the signal transmission based on OFDM; the frame structure of the communication system is divided into two time slots with equal length, in the odd time slot, the special D2D transmitter can send signals and receive relay forwarding signals, and in the even time slot, the special D2D transmitter sends self transmission signals and relay forwarding signals based on OFDM.
Further, the cellular user normally communicates with the base station BS by using an uplink in all time slots, the ordinary direct-connection D2D user normally multiplexes cellular resource communication in all time slots, the long-distance D2D transmitter sends a signal in an odd time slot, and receives a relay forwarding signal in an even time slot; the special D2D acting as a relay performs normal direct communication using one cellular resource in odd slots, receives a relay forwarding signal using another available multiplexing resource, and transmits its own communication signal and the relay forwarding signal in even slots.
Further, the long range D2D transmitter sends information to the special D2D transmitter acting as a relay by multiplexing the special D2D pairs of pairable cellular resources at odd time slots.
Further, the special D2D transmitter acting as a relay uses both cellular resources at the same time in odd slots, communicates normally on one resource, does not transmit on the other resource, receives only signals from the remote D2D user and stores for retransmission in even slots.
Further, the special D2D transmitter acting as a relay simultaneously multiplexes two resource blocks that can be paired for signal transmission based on OFDM in even slots, and transmits signals to the long-distance D2D receiver and the special D2D receiver, respectively, based on OFDM.
Further, the far distance D2D receiver and the special D2D receiver receive the transmitted signal from the special D2D transmitter acting as a relay at even slots.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the problem that D2D communication cannot be carried out due to distance limitation can be effectively solved by selecting the D2D user as the relay equipment of the long-distance D2D pair, and the access quantity of the system D2D is effectively increased; the OFDM technology can fully utilize the condition that one D2D multiplexes a plurality of cellular resources, and effectively improves the utilization efficiency of the spectrum in the system on the premise of ensuring the communication quality of the special D2D serving as a relay.
Drawings
Fig. 1 is a D2D communication link diagram under an LTE system;
FIG. 2 is a diagram of one-to-one and many-to-one resource reuse scenarios;
FIG. 3 is a diagram of a D2D communication scenario in which a D2D user acts as a relay in the present invention;
FIG. 4 is a diagram illustrating a system information transmission scheduling frame structure according to the present invention;
fig. 5 is a diagram of a communication scenario of OFDM-based cooperative relay D2D in the present invention;
fig. 6 is a general model diagram of a communication scenario of the OFDM-based cooperative relay D2D in the present invention.
Detailed Description
The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings and examples.
As shown in fig. 3, the D2D pair is used as a relay device, and the D2D pair serving as a relay is called a special D2D pair, so that the intra-system spectrum resources can be effectively utilized and the number of system accessible communications D2D can be increased.
The system frame structure is divided into two time slots with odd-even alternation and equal length, cellular users normally use uplink to communicate with the base station BS in all time slots, common direct-connection D2D users normally multiplex cellular resource communication in all time slots, a long-distance D2D transmitter sends signals in odd time slots, and a long-distance D2D receiver receives relay forwarding signals in even time slots. The special D2D user acting as a relay uses one cellular resource for normal direct communication in odd time slots, uses another available multiplexing resource to receive the relay forwarding signal, and sends the signal's own communication signal and the relay forwarding signal in even time slots, as shown in fig. 4.
As shown in fig. 5, the OFDM-based cooperative relay D2D communication transmission scheme proposed by the present invention is directed to a single cell communication scenario, where multiple cellular users and D2D users exist in a cell, the cellular users preferentially select resources, then the D2D performs resource multiplexing after effective grouping, when the D2D pairs are grouped, one D2D pair may be paired with multiple cellular resources, but in an actual use process, only one cellular resource is specified to be multiplexed by one D2D pair, and OFDM-based cooperative relay D2D communication is proposed in order to improve spectrum utilization. As shown in fig. 6, for analysis of a cooperative relay transmission situation, a cell contains a base station, a pair of long-distance D2D pairs, and two D2D groups, which can be multiplexed by a special D2D pair (D2D _1) serving as a relay at the same time. The long-distance D2D cannot perform normal communication due to distance limitation, the special D2D transmitter acting as a relay receives the signal transmitted by the long-distance D2D transmitter and forwards the signal to the long-distance D2D receiver, and the special D2D pair can also perform normal communication. The dashed lines in the figure represent interfering signals. The following describes the procedure of the present scheme by taking the data transmission of the system in two time slots as an example.
(1) Odd number of time slots
Step 1: remote at odd time slotsThe off-D2D transmitter sends information to the special D2D transmitter acting as a relay by multiplexing the special D2D pairable cellular resources. As shown in FIG. 6, the special D2D pair can multiplex the cellular resources of packet 1 and packet 2 simultaneously, and the long-distance D2D transmitter arbitrarily multiplexes one of the resources for data transmission S0The special D2D user reuses the remaining one resource for normal signal transmission S1。
Step 2: the same resource-specific D2D transmitter does not transmit signals at odd slots and long distances, only receives signals from remote D2D users and stores them for retransmission at even slots. The special D2D transmitter receives the signal S transmitted from the long-distance D2D transmitter0And simultaneously receiving signals sent by other D2D transmitters in the cluster, and dividing the signals by S0Besides signals, other signals are interference signals.
(2) Even number of time slots
Step 4, the special D2D transmitter which acts as a relay in the even time slot simultaneously multiplexes two resource blocks which can be paired for signal transmission by OFDM technology. Signal S is transmitted to a long-distance D2D receiver and a special D2D receiver respectively through OFDM technology2And S3. Through OFDM technology, the special D2D transmitter can utilize the cellular resources of packet 1 and packet 2 simultaneously, and utilize orthogonal resources to transmit signal S without mutual interference2And S3To both receivers.
Step 5 the long-range D2D receiver and the special D2D receiver receive the signal transmitted from the special D2D transmitter acting as a relay at even slots. The long-distance D2D receiver and the special D2D receiver are receiving the useful signal S2And S3Meanwhile, communication signals of other D2D users (D2D _2 and D2D _3) in the group are received, and the signals can be regarded as interference signals to carry out correct signal reception.
The embodiments of the present invention are described in detail with reference to the prior art, and the description thereof is not limited thereto. The invention is verified by repeated experiments, and obtains more satisfactory effect.

Claims (6)

1. A cooperative relaying D2D communication method based on OFDM, characterized in that a long-distance D2D pair performs data relay communication through a special D2D pair, the special D2D pair multiplexes a plurality of resources and as a relay device, performs signal transmission using a plurality of available resources based on OFDM; the frame structure of the communication system is divided into two time slots with equal length, in an odd time slot, a special D2D transmitter can send signals and receive relay forwarding signals, and in an even time slot, the special D2D transmitter sends self transmission signals and forwards the relay forwarding signals based on OFDM.
2. The OFDM-based cooperative relaying D2D communication method according to claim 1, wherein cellular users normally use uplink to communicate with BS in all timeslots, normal direct-connected D2D users normally multiplex cellular resources to communicate in all timeslots, long-distance D2D transmitter transmits signal in odd timeslot, long-distance D2D receiver receives the relay forwarding signal in even timeslot; the special D2D acting as a relay performs normal direct communication using one cellular resource at the odd-numbered time slot, receives the relay forwarding signal using another available multiplexing resource, and transmits its own communication signal and the relay forwarding signal at the even-numbered time slot.
3. The OFDM-based cooperative relaying D2D communication method according to claim 2, wherein the long-range D2D transmitter sends information to the special D2D transmitter acting as a relay by multiplexing the special D2D pair of pairable cellular resources at the odd slots.
4. The OFDM based cooperative relaying D2D communication method according to claim 3, wherein said special D2D transmitter acting as a relay uses two cellular resources simultaneously in said odd slots, communicates normally on one resource, does not transmit on the other, receives only signals from far end D2D users and stores them for forwarding in said even slots.
5. The OFDM based cooperative relaying D2D communication method according to claim 4, wherein the special D2D transmitter acting as a relay multiplexes two resource blocks that can be paired simultaneously for signal transmission based on OFDM in the even slots, and transmits signals to long-distance D2D receiver and special D2D receiver respectively based on OFDM.
6. The OFDM based cooperative relaying D2D communication method according to claim 5, wherein the long range D2D receiver and the special D2D receiver receive the signal transmitted from the special D2D transmitter acting as a relay at the even slots.
CN202110153511.7A 2021-02-04 2021-02-04 Cooperative relay D2D communication method based on OFDM Active CN112994759B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116669137A (en) * 2023-05-30 2023-08-29 山东大学 Self-adaptive single-hop and two-hop D2D data transmission method and device
WO2023164908A1 (en) * 2022-03-03 2023-09-07 北京小米移动软件有限公司 Signal multiplexing method/apparatus/device and storage medium

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CN108566665A (en) * 2018-03-12 2018-09-21 清华大学 A kind of relay selection method and the network equipment
CN110061764A (en) * 2019-04-17 2019-07-26 南京邮电大学 Cooperation D2D transmission plan based on NOMA and relaying technique
CN110768759A (en) * 2018-07-26 2020-02-07 深圳市白麓嵩天科技有限责任公司 Hybrid duplex relay-assisted D2D communication method

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Publication number Priority date Publication date Assignee Title
WO2014007446A1 (en) * 2012-07-02 2014-01-09 엘지전자 주식회사 Method and apparatus for controlling interference between cellular communication and d2d communication
CN106688288A (en) * 2014-09-25 2017-05-17 三星电子株式会社 Synchronization procedure and resource control method and apparatus for communication in d2d system
CN107113713A (en) * 2014-12-19 2017-08-29 三星电子株式会社 Apparatus and method for providing repeater selection into device communication system in device
CN108566665A (en) * 2018-03-12 2018-09-21 清华大学 A kind of relay selection method and the network equipment
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023164908A1 (en) * 2022-03-03 2023-09-07 北京小米移动软件有限公司 Signal multiplexing method/apparatus/device and storage medium
CN116669137A (en) * 2023-05-30 2023-08-29 山东大学 Self-adaptive single-hop and two-hop D2D data transmission method and device

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