Contention window adjusting method taking 802.11e VoIP application as orientation

A technology of competition window and adjustment method, which is applied in the direction of electrical components, wireless communication, transmission system, etc., and can solve problems such as wasting channel resources, difficulty in guaranteeing QoS, and inability to achieve system performance

Active Publication Date: 2014-09-17
CENT SOUTH UNIV +1
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AI Technical Summary

Problems solved by technology

This method is difficult to guarantee the guarantee of QoS such as delay and jitter during VoIP transmission
CW in EDCA min with CW max Static setting of , resulting in most packets in the same discrete interval [0, CW max ] to choose, which increases the probability of conflict
The increase of conflicts greatly wastes channel resources, causing the throughput to drop rapidly, and the optimal system performance cannot be achieved.
[0006] (2) The bottleneck...

Method used

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  • Contention window adjusting method taking 802.11e VoIP application as orientation
  • Contention window adjusting method taking 802.11e VoIP application as orientation
  • Contention window adjusting method taking 802.11e VoIP application as orientation

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Embodiment 1

[0052] see figure 1 , is a flowchart of the present invention. It is a method implemented on the AP, and the process is as follows:

[0053] According to the MAC layer parameters corresponding to the access 802.11 mechanism and the corresponding VoIP encoding method, the optimal value of the AP access probability is calculated, and the variable storage:

[0054] τ AP opt = δ T data + SIFS + T ack + DIFS

[0055] Where δ is the slot time; T data and T ack They are the time to transmit a VoIP data packet and the corresponding ACK respectively, and the calculation method is to divide the length of the DATA or ACK packet by the physical transmission rate. ...

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Abstract

The invention discloses a contention window adjusting method taking an 802.11e VoIP application as orientation. The method includes the steps that (1) the optimal network access probability TauAPopt of a wireless AP is calculated according to an access MAC layer parameter and a VoIP coding mode; (2) the optimal value CWminAP of the size of the minimum contention window and the optimal value CWmaxAP of the size of the maximum contention window of the AP are calculated according to the TauAPopt; (3) the average collision rate favgj in the jth period at the AP is calculated, and then the network access probability TauSTA of a site STA is adjusted according to the relation of the favgj and the threshold value fopt; (4) the maximum contention window and the minimum contention window of the site are calculated by the AP according to the TauSTA; the maximum contention window and the minimum contention window of the site are broadcasted by the AP by using a periodic Beacon frame. By means of the contention window adjusting method taking the 802.11e VoIP application as orientation, the effective availability of a wireless channel can be improved, the network throughput is improved, and the VoIP capacity is improved as well.

Description

technical field [0001] The invention relates to a contention window adjustment method for 802.11e VoIP applications. Background technique [0002] With the rapid development of Voice over Internet Protocol (VoIP) technology and Wireless Local Area Network (WLAN) technology, WLAN-based VoIP has been rapidly and widely used in recent years. IEEE802.11 Distributed Coordination Function (DCF) Media Access Control (MAC) protocol has become the mainstream WLAN MAC protocol due to its simplicity and robustness. Its basic idea is Carrier Sense Multiple Access (CSMA) and Collision Avoidance ( CA). The IEEE802.11DCF protocol mainly supports the transmission of non-real-time data streams. In order to enhance support for real-time services such as VoIP, IEEE has formulated an Enhanced Distributed Channel Access mechanism (EDCA, Enhanced Distributed Channel Access). EDCA expands QoS support on the basis of the DCF mechanism, provides a mechanism for prioritizing different service flows...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04W74/08
Inventor 王建新董苹苹王伟平盛羽
Owner CENT SOUTH UNIV
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