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A multi-channel operation method in a wave system

An operation method and multi-channel technology, applied in the field of vehicular ad hoc networks, can solve the problems of synchronization collision, time synchronization, and low channel utilization, and achieve the effects of increasing reliability, reducing network delay, and improving throughput

Inactive Publication Date: 2017-02-01
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

For cost considerations, most vehicle nodes are equipped with only one wireless transceiver. In this case, in order to utilize the resources of each channel, it is necessary to switch back and forth between different channels, but the channel utilization Problems such as low rate, time synchronization and synchronization collision
The channel utilization rate of the original multi-channel operation method is only half at most, and the transmission delay of ordinary data of nodes is relatively large due to channel switching

Method used

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  • A multi-channel operation method in a wave system
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  • A multi-channel operation method in a wave system

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Embodiment Construction

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It is assumed that only two nodes are exchanging information on the SCH, and packet loss is caused by collision. When the node does not receive the safety message, it will stay on the SCH until the transmission of the non-safety message is completed. When a packet loss is detected or a WSM safety message is received, it switches to the CCH to receive the safety message. The specific implementation is as follows:

[0021] (1) Like the original multi-channel operation, 50ms is used as a channel interval. When the node does not need to provide services or has not received WSA, the node will always work on CCH. When the node sends WSA, it will alternate between CCH and SCH. Handover is performed, and the node will send four WSAs on each subsequent CCH interval. After receiving the WSA, some other node will switch to the SCH when the next SCH in...

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Abstract

The invention discloses a multichannel operation method in a WAVE (wireless access in vehicular environments) system. The method comprises the following steps of when a node does not need a service or does not receive a WSA (WAVE service advertisement), the node works on a CCH (control channel) always; after the node sends the WSA, the node is alternatively switched on the CCH and an SCH (service channel); after receiving the WSA, other nodes are switched to the SCH when the next SCH interval arrives, at the moment, the user node sends a WSA_ACK data package to a provider node; the provider node returns back to the alternatively switching state between the CCH and the SCH after sending the data and always works on the CCH if no other services need to be provided. The user node is switched back to the CCH if not receiving the data in one channel interval. The multichannel switching is performed by adopting a self-adaptive method, the multichannel operation method is suitable for all scenes without the need of using road side facilities as auxiliary facilities, the network throughout can be well improved, and the network average delay can be well reduced.

Description

technical field [0001] The invention belongs to vehicle ad hoc network technology, in particular to an adaptive multi-channel operation method in a wireless access (Wireless Access in Vehicular Environments, WAVE) system in a vehicle environment. Background technique [0002] With the development of intelligent transportation, the IEEE working group has specially formulated the WAVE standard for vehicular ad hoc network communication. WAVE includes two parts, IEEE1609.x and IEEE802.11p, among which IEEE802.11p defines the physical layer and a part of the media access control (Media Access Control, MAC) layer, IEEE1609.4 is an extension of the 802.11p MAC layer, located in the 802.11p MAC Above the layer, multi-channel operation is realized, and the switching between the control channel (Control Channel, CCH) and multiple service channels (Service Channel, SCH) is effectively coordinated to realize the efficient transmission of various information. For cost considerations, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/04H04W36/00H04L1/16
Inventor 秦华标梁康楠
Owner SOUTH CHINA UNIV OF TECH
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