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Minimum competition window adjusting method based on neighbor node number estimation in vehicle-mounted network

A technology of competing windows and neighbor nodes, applied in the field of vehicle network, can solve the problems of not being able to use RTS/CTS handshake protocol, not being able to use BEB, etc.

Active Publication Date: 2013-08-21
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Therefore, although the binary exponential backoff method of IEEE802.11MAC layer can improve the scalability of unicast message transmission, in broadcast environment, we can neither utilize BEB nor RTS / CTS handshake protocol

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  • Minimum competition window adjusting method based on neighbor node number estimation in vehicle-mounted network
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  • Minimum competition window adjusting method based on neighbor node number estimation in vehicle-mounted network

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Embodiment Construction

[0069] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0070] We use VanetMobiSim and NS2.35 to simulate and verify the method proposed by the present invention, and compare the performance of the minimum contention window adjustment method based on the estimation of the number of neighbor nodes with the original fixed-size initial contention window. In the broadcast performance simulation process of IEEE802.11p, each node works on the control channel CCH, and periodically broadcasts data frames to its one-hop neighbor nodes, and all broadcast frames have the same priority. The present invention will use the latest NS2.35 PBC Agent to generate periodic broadcast frames. The broadcast frame size is 250 bytes, and the broadcast frame generation frequency is 5Hz. Considering the mobility of vehicles, we built a highway scene under VanetMobiSim. In this scene, there are four two-way lanes in total, ...

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Abstract

The invention discloses a minimum competition window adjusting method based on a neighbor node number estimation in a vehicle-mounted network, wherein the minimum competition window adjusting method based on the neighbor node number estimation in the vehicle-mounted network aims to solve the problem of radio expandability of a vehicle-mounted Ad hoc network MAC layer with a faster vehicle density change. Under the premise of an aim of minimizing the radio frame collision probability, the minimum competition window adjusting method based on the neighbor node number estimation in the vehicle-mounted network derivates a relationship between a minimum competition window and the number of competition anodes, a minimum competition window value is dynamically adjusted according to a real-time estimation of the number of vehicle neighbor nodes, the change of the minimum competition window value is made to reflect competition conditions in the network, therefore, waste of channel resources is reduced, and radio performance is improved. The minimum competition window adjusting method based on the neighbor node number estimation in the vehicle-mounted network has the aim of minimizing the collision probability, deviates the relationship between a CWmin and the number of active competition nodes, the minimum competition window is adjusted in a self-adjusting mode according to the real-time estimation of the number of the vehicle neighbor nodes, and the vehicle density change is reflected through adjustment of the minimum competition window, and therefore radio expandability of an IEEE802.11p MAC layer is improved.

Description

technical field [0001] The invention relates to the field of vehicle network technology, in particular to a minimum contention window adjustment method based on the estimation of the number of neighbor nodes in the vehicle network. Background technique [0002] In the wireless vehicular ad hoc network, IEEE established the Wireless Access in Vehicular Environment (WAVE) working group, which is responsible for formulating the WAVE protocol stack for vehicular communication. The bottom layer of the WAVE protocol stack adopts the IEEE802.11p protocol [1] . Among them, the MAC layer of IEEE802.11p defines how different competing nodes access the network on a single control channel or service channel. The MAC layer of IEEE802.11p adopts the distributed coordination function DCF, and DCF has two operation modes of broadcast and unicast. For safety-related applications on the control channel, messages are mainly transmitted in broadcast mode, such as cooperative collision avoida...

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Application Information

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IPC IPC(8): H04L12/807H04W84/18H04L47/27
Inventor 刘南杰刘委婉李大鹏赵海涛黄波
Owner NANJING UNIV OF POSTS & TELECOMM
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