A mac layer data transmission method based on neighbor node cooperative communication in vehicle networking
A technology of neighbor nodes and cooperative communication, applied in wireless communication, connection management, electrical components, etc., can solve problems such as high overhead, low efficiency, and large delay
Active Publication Date: 2020-10-27
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0006] The purpose of the present invention is to address the inefficiency of retransmission, large time delay, and large overhead when data transmission fails in the existing vehicle network, and proposes a MAC layer data transmission method based on neighbor node cooperative communication in the vehicle network. The quality of the channel determines the reliability of data packet transmission. Therefore, the method introduces cooperative nodes to carry out cooperative communication on data packets that fail to be transmitted, avoiding multiple invalid retransmissions, and making full use of the idle time frame under the current time frame. Time slots are used to transmit data of cooperative nodes, and there is no need to wait for the next frame to retransmit, thereby improving the probability of successful data packet transmission, reducing delay, and improving network performance
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[0029] This embodiment provides a MAC layer data transmission method based on neighbor node cooperative communication in the Internet of Vehicles. The execution flow chart is as follows: Figure 4 As shown, the main process is as follows:
[0030] (1) Vehicle nodes broadcast messages to maintain neighbor node tables
[0031] The vehicle-mounted ad hoc network has the characteristics of high-speed movement of vehicle-mounted terminals, highly dynamic network topology changes, high real-time security services, and large network load. The schematic diagram of the vehicle topology is as follows: figure 1 As shown, the vehicle node in the Internet of Vehicles periodically broadcasts beacon messages to the neighbor nodes within the communication range of the node, and dynamically maintains the neighbor node table T(i) of the node in real time according to the obtained neighbor node information, and the neighbor node The node table contains the beacon information of its own node and...
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The invention discloses a data transmission method for an MAC layer based on cooperative communication between neighbor nodes in the Internet of vehicles, and belongs to the technical field of vehicular ad-hoc network communication. According to the method, cooperative retransmission is performed on a data packet with the transmission being failed through introducing cooperative nodes in allusionto a phenomenon of multiple times of retransmission performed when the data transmission fails in the existing vehicular network, and the idle time slot in the current time frame is sufficiently utilized, so that the channel utilization ratio is effectively improved. In the cooperation mechanism, the optimum selection nodes are selected by adopting different strategies according to the number of failure nodes, and the establishment of a stable link is ensured to complete the cooperative communication, so that the probability of successful data packet transmission is improved, the time delay isalso reduced, and reliable transmission of data in the network is effectively realized. The data transmission method can be used as an MAC layer protocol for transmitting broadcast messages by nodesin the vehicular network, and is applicable to scenarios with complex network topological structure and low data transmission reliability.
Description
technical field [0001] The invention relates to the technical field of vehicle ad hoc network communication, in particular to a MAC layer data transmission method based on neighbor node cooperative communication in the vehicle network. Background technique [0002] In recent years, the number of automobiles has grown rapidly, and the intelligent transportation system (ITS) has gradually developed, becoming a research hotspot in academia and engineering. Vehicle Ad Hoc Network (VANET) is considered to be the foundation and core technology for developing intelligent transportation systems and improving road traffic safety. Vehicle ad hoc network is a new type of wireless ad hoc network composed of mobile vehicles with perception, calculation, storage and wireless communication capabilities and roadside basic communication units driving on traffic roads. Compared with the traditional mobile ad hoc network, the vehicular ad hoc network not only has the characteristics of termin...
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IPC IPC(8): H04W40/02H04W76/18
CPCH04W40/02H04W76/18
Inventor 胡斌杰吴朝东蔺丽钊
Owner SOUTH CHINA UNIV OF TECH