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A distributed priority congestion control method for ieee802.11p vehicle system

An ieee802.11p, distributed technology, applied in the field of distributed priority congestion control for IEEE802.11p vehicle-mounted systems, can solve problems such as inability to effectively guarantee high-priority business transmission, reduce channel competition, improve throughput, The effect of resolving channel collisions

Active Publication Date: 2017-05-03
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the Y. Zhang scheme cannot effectively guarantee the transmission of high-priority services

Method used

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  • A distributed priority congestion control method for ieee802.11p vehicle system
  • A distributed priority congestion control method for ieee802.11p vehicle system
  • A distributed priority congestion control method for ieee802.11p vehicle system

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described in detail below. The present invention adopts the distributed priority congestion control method, and the business of each level periodically counts the packet transmission status of its queue (including the total number of required transmission packets, the number of waiting transmission packets in the queue and the number of transmission packets that have collided and failed), according to According to the channel congestion situation of the service represented by the statistical results, the minimum back-off window length of channel access for this level of service is adjusted to reduce the collision probability between services. The specific implementation steps are as follows:

[0027] 1) The queue v where the service of level m is located initializes the minimum back-off window length value CW min (m)

[0028] 2) When the statistical time length of a cycle is not reached (assuming that the statistic...

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Abstract

The invention discloses a distributed priority congestion control method for an IEEE802.11P vehicle-mounted system. The main content comprises: the service of each priority grade periodically counting packet sending status (including a total demand transmission packet number, the number of waiting transmission packets in a queue, and the number of transmission packets which already encounter bump failure) of a queue where the service is located in, and according to a statistical result, designing and representing channel congestion status of queues where different grade services are located in; the different grade services being corresponding to different channel congestion thresholds; and through combining with the channel congestion status and the congestion thresholds of the queues where the services are located in, adjusting the control parameters of the channel accesses of the grade services, i.e., a minimum rollback window length, so as to reduce bump probability among the services, ensure the transmission quality of higher-priority services, and improve system throughput.

Description

technical field [0001] The invention relates to a congestion control method applied to a vehicle-mounted system of the IEEE802.11p protocol, and aims to solve the channel congestion problem under the coexistence of multiple priority services by using a distributed method, so as to ensure the service quality of high priority services. Background technique [0002] The IEEE802.11p protocol is a transmission protocol formulated for the vehicle environment, and is currently the most mature protocol designed for vehicle systems. In order to support different types of transmission services in the vehicle system, the MAC layer of IEEE802.11p has designed 4 transmission queues with different transmission priorities. The four transmission queues all use the carrier sense with collision avoidance (CSMA / CA) channel access mechanism to compete for the transmission channel. In order to ensure that high-priority services can obtain transmission channels faster, the following two methods ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/851H04W28/08
Inventor 程翔沈霞焦秉立
Owner PEKING UNIV