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A packet dispatching method based on avoidance mechanism in WLAN

A technology of wireless local area network and back-off mechanism, which is applied in wireless communication, data exchange network, digital transmission system, etc., can solve the problems of low complexity and low channel utilization rate, improve system performance, improve channel utilization rate, and be easy to implement Effect

Inactive Publication Date: 2008-03-26
SHANDONG UNIV
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Problems solved by technology

[0005] The present invention aims at the shortcoming of the low channel utilization rate existing in the CSMA / CA mechanism of the MAC layer in the existing wireless local area network system, and provides a wireless local area network based on A packet scheduling method with a backoff mechanism, which has low complexity and good compatibility with standards

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  • A packet dispatching method based on avoidance mechanism in WLAN

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Embodiment Construction

[0015] The packet scheduling algorithm of the present invention is shown in FIG. 1 . Before a node accesses a channel, it needs to go through two contention backoff stages, wherein the first contention backoff stage can continue to backoff when transmitting data between other nodes. The nodes can access the channel only after the data packets complete the two contention backoff phases in sequence. The transmission of data packets is performed simultaneously with the contention backoff. First, the network node detects whether the data channel is idle. If the channel is busy, when the node receives the CTS frame (the destination station is not the node), it starts to perform the back-off timing of the back-off timer BC1. If before the end of the data packet transmission process, BC1 is reduced to 0, then BC1 remains in the state with a value of 0. After waiting for the channel idle distributed time interval DIFS, BC2 starts to back off and count down. The node with BC2 first sta...

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Abstract

The invention discloses a group scheduling method adopted in the wireless LAN based on a back-off system. The group scheduling method includes a first competition back-off phase and a second competition back-off phase which are respectively provided with a corresponding competition window. The competition window for the first competition back-off phase has a broader range (1023 as the maximum value) while the competition window for the second competition back-off phase has a smaller range (255 as the maximum value). The nodes cannot visit the channels unless the data groups complete the two back-off phases in order. The group scheduling algorithm for the invention is characterized in that when the two nodes in the network are connected by using RTS / CTS frames, other nodes in the network detect the CTS frame. At the same time, the back-off timers which are not zero in the nodes during the first competition phase continue to back off. The invention includes two back-off phases, while the transmission of data groups and competition back-off are carried out simultaneously. Therefore, the utilization ratio of channels in the highly loaded network system can be greatly increased.

Description

technical field [0001] The invention relates to a group scheduling algorithm based on backoff mechanism in a wireless local area network (IEEE 802.11) system, and belongs to the technical field of medium access control (MAC) layer in the wireless local area network system. Background technique [0002] In the modern communication system, wireless communication means are paid more and more attention by people. Compared with the wired network system, the available channel bandwidth of the wireless network is very narrow, the wireless network nodes use the wireless channel through competition, and the carrier sense multiple access (CSMA / CA) with collision detection in the MAC layer of the wireless LAN system The mechanism can be used to solve the competition problem among nodes, so it is also used by the MAC layer of other systems such as wireless ad hoc networks and wireless sensor networks. This mechanism exposes the disadvantage of low channel utilization in high-load netwo...

Claims

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Application Information

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IPC IPC(8): H04L12/28H04L12/56H04W72/12H04W74/08
Inventor 袁东风吴印桂
Owner SHANDONG UNIV
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