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Wireless medium access methods for DCF (distributed coordination function)/PCF (point coordination function) on basis of residual delays

An access method and wireless media technology, applied in wireless communication, network traffic/resource management, electrical components, etc., to achieve the effect of improving service quality

Active Publication Date: 2013-12-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even for data packets belonging to the same category, due to the different path hops experienced and the dynamics of wireless transmission delay, data packets of low priority categories may have more urgent delay requirements, IEEE802.11e protocol does not adapt to this situation

Method used

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  • Wireless medium access methods for DCF (distributed coordination function)/PCF (point coordination function) on basis of residual delays
  • Wireless medium access methods for DCF (distributed coordination function)/PCF (point coordination function) on basis of residual delays
  • Wireless medium access methods for DCF (distributed coordination function)/PCF (point coordination function) on basis of residual delays

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Embodiment

[0047] Such as figure 1 As shown, this embodiment discloses a DCF wireless medium access method based on residual delay, including the following steps:

[0048] (1) First, each site calculates the local residual delay value of each data packet when it enters the buffer queue according to the end-to-end residual delay value of the data packet and its routing status, and then obtains the estimated minimum delay value of the data packet in the buffer queue. late departure time e i , and finally determine its position in the cache queue according to the estimated latest departure time of the data packet, that is, the data packet with the earliest estimated latest departure time is at the head of the queue and will be served first; the data packet at the head of the cache queue is the site The next data to be sent; the local remaining delay value of the data packet refers to the time that the data packet is allowed to stay at the local site;

[0049] Time a when the data packet a...

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Abstract

The invention discloses wireless medium access methods for a DCF (distributed coordination function) / a PCF (point coordination function) on the basis of residual delays. Local residual delay values are computed according to the end-to-end residual delays of data packets and routing states of the data packets in the methods, and positions of the data packets in buffer queues are determined according to the local residual delay values of the data packets. The wireless medium access method for the DCF includes comparing the local residual delays of the next to-be-transmitted data packets of various websites to determine competition windows and interframe spaces of the various data packets so that the probability that the certain data packet with the small local residual delay value can preferably access a channel is high. The wireless medium access method for the PCF includes comparing the local residual delays of the next to-be-transmitted data packets of the various websites to obtain a polling list and polling sequences of the websites in each competition-free period so that the certain data packet with the minimum local residual delay value can preferably access the channel. The methods have the advantages that the certain website with the small local residual delay can assuredly preferably access the channel, and the end-to-end service quality of networks can be improved.

Description

technical field [0001] The present invention relates to a wireless medium access method in a wireless local area network, in particular to a wireless medium access method based on a residual delay-based DCF (Distributed Coordination Function) and a residual delay-based PCF (Point Coordination Function, centralized coordination function) wireless medium access method. Background technique [0002] IEEE802.11 wireless local area network has the advantages of convenience, flexibility, low cost and easy expansion, and has been widely used in various occasions in recent years. However, compared with the traditional wired network, there is still a big gap in the quality of service (QoS, Quality of Service) of the wireless network. In addition to the inherent reasons of the wireless transmission medium, the MAC (Medium Access Control, Media Access Control) protocol is also caused An important factor in performance bottlenecks. Therefore, in order to further improve the QoS of WLA...

Claims

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Application Information

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IPC IPC(8): H04W28/14H04W74/02H04W74/06
Inventor 官权升彭攀谢驰一姜胜明毛华超
Owner SOUTH CHINA UNIV OF TECH
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