Displacement trend and IEEE802.11p-based vehicular ad hoc networks (VANET) channel access method
A channel access method and displacement technology, applied in the field of VANET channel access based on displacement trend and IEEE802.11p, can solve the problems of low fairness, high packet loss rate, low efficiency, etc., to improve the possibility and reduce the loss of Inclusion rate and the effect of improving fairness
Active Publication Date: 2015-12-09
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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[0006] In view of the defects or deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a VANET channel access method combining displacement trend and IEEE802.11p, which solves the low efficiency and low fairness of current VANET communication In addition, according to the displacement trend of communication nodes, the interval between arbitration frames can be selected in a targeted manner, and service differentiation can be made for different displacement trends to improve fairness, increase throughput, and reduce time delay
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[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0031]In order to solve the problem of channel fairness of vehicle nodes in V2V communication mode, aiming at the traffic mobility characteristics of vehicle nodes in VANET (Vehicle Networking), this application proposes a service differentiation algorithm VEDCA (VANETEnhancedDistributedChannelAccess) based on displacement trend, In this algorithm, each vehicle node selects different inter-frame intervals by judging the displacement trend of itself and the target node so that it has different access channel priorities, and effectively improves packet loss and fairness in the communication process by optimizing the service differentiation mechanism problems and allocate resources reasonably, so as to achieve the purpose of optimizing the network and improving performance.
[0032] In the IEEE802.11p standard, messages are divided into four types...
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The invention relates to the field of communication, in particular to a displacement trend and IEEE802.11p-based vehicular ad hoc networks (VANET) channel access method. The method comprises the following steps: (A) receiving a data packet, recording the distance to a message node, and judging whether a previous distance record exists in the message node or not within effective time, if not, regarding as that first communication should reserve original enhanced distributed channel access mechanism (EDCA) parameters, if so, entering the next step of the algorithm; (B) comparing the recorded distance of a new vehicle node with the recorded distance of the previous same target node to judge the displacement trend, and determining the displacement trend type; and (C) updating corresponding vehicular networking arbitration interframe space number (VIFSN) according to different displacement trend types, obtaining a vehicular networking arbitration interframe space (VIFS) by the number when waiting that the vehicle node transmits information to the message node, and participating into channel contention. According to the method disclosed by the invention, the problems of low efficiency, low fairness, high packet loss probability and high time delay of current VANET communication are solved.
Description
technical field [0001] The invention relates to the communication field, in particular to a VANET channel access method based on displacement tendency and IEEE802.11p. Background technique [0002] VANET (Vehicular Adhoc Networks) is a special mobile ad hoc network that operates in the road traffic environment, uses vehicles and roadside access points as communication nodes, and supports vehicle traffic information interaction, also known as the Internet of Vehicles. The communication of VANET mainly includes the following two structural modes: communication between vehicle nodes (V2V, Vehicle to Vehicle) and communication between vehicle nodes and roadside infrastructure (V2I, Vehicle to Infrastructure). VANET plays an extremely important role in the collection of road condition information, geographic location information navigation, and the effective diffusion of safety information. It improves traffic efficiency and avoids traffic accidents, and provides a double guarant...
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Login to View More IPC IPC(8): H04W74/08
CPCH04W74/0833
Inventor 杨志华刘乐天赵尚春
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL