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Multi-channel MAC protocol method based on cluster mechanism in vehicular Ad hoc network

A vehicle-mounted self-organizing, multi-channel technology, applied in network topology, wireless communication, electrical components, etc., can solve problems such as congestion, collision, and data loss, and achieve the effects of reducing the probability of collision, reducing the number of nodes, and avoiding channel conflicts

Active Publication Date: 2015-10-21
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The existing MAC protocol does not consider that the movement of nodes will cause collisions between nodes, and nodes occupying the same service channel will collide and cause data loss if they enter the communication range of each other.
And as the number of nodes increases, the number of nodes accessing the control channel at the same time also increases, which will put a lot of pressure on the control channel and cause congestion

Method used

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  • Multi-channel MAC protocol method based on cluster mechanism in vehicular Ad hoc network
  • Multi-channel MAC protocol method based on cluster mechanism in vehicular Ad hoc network
  • Multi-channel MAC protocol method based on cluster mechanism in vehicular Ad hoc network

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing, the present invention will be further described:

[0038] see figure 1 , figure 1 It is a vehicle-mounted ad hoc network topology model provided by an embodiment of the present invention. In the embodiment of the present invention, the network topology model may include:

[0039] The specific description is as follows. The vehicle ad hoc network model consists of multiple vehicles on one-way roads. These vehicles are divided into multiple clusters, and each cluster contains a cluster head and multiple cluster members. The cluster head dynamically specifies and allocates service channels according to the status of the cluster members.

[0040] Each vehicle is equipped with a GPS receiver, which can accurately know the location of the vehicle.

[0041] Each vehicle uses two transceivers, one works in the control channel for sending and receiving emergency messages and control packets; the other switches between service c...

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Abstract

The invention requests to protect a multi-channel MAC protocol method based on a cluster mechanism. Firstly, each cluster head allocates time slots for cluster members according to position information of the cluster members, each cluster member reserves a channel in the own time slot, and the number of nodes accessed to the channels at the same time is reduced. Secondly, collisions are generated between neighbor nodes due to rapid movements of the nodes and then result in data loss, so, when the cluster heads allocate the channels for the cluster members, channel occupancy conditions of the neighbor nodes of the cluster members are considered. Finally, the cluster heads allocate the service channels for the cluster members and periodically broadcast a channel occupancy table, and the cluster members transmit data on the allocated channels. The provided multi-channel MAC protocol method based on the cluster mechanism obviously reduces the channel collision probability and improves reliability of data transmission.

Description

technical field [0001] The invention relates to the technology in the field of vehicle ad hoc networks, in particular to a multi-channel MAC protocol based on a cluster mechanism. Background technique [0002] As an important part of intelligent transportation system, vehicular ad hoc network can support wireless communication between vehicles and between vehicles and roadside units, which plays an important role in improving the safety and efficiency of vehicular communication. Among them, the MAC protocol is the main technical difficulty of the vehicle self-organizing network, which is related to the quality of the network performance. With the increase of the number of vehicles, the scale of the vehicular ad hoc network becomes larger and larger, and the channel conflicts increase accordingly. The single-channel MAC protocol can no longer meet the performance requirements of the entire network. Compared with single channel, multi-channel communication can reduce the coll...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W84/18
CPCH04W72/0446H04W84/18H04W72/52H04W72/20
Inventor 唐伦郜宁陈前斌李守捷
Owner CHONGQING UNIV OF POSTS & TELECOMM
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