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Method for optimizing 802.11 centralized coordination function

A coordination function and centralized technology, which is applied in the communication between multiple stations, electrical components, network topology, etc., can solve the problems of channel reservation, increase of data transmission delay, failure to meet real-time service delay and jitter, etc., to achieve The effect of reducing communication delay and improving channel transmission efficiency

Inactive Publication Date: 2010-06-30
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The DCF mechanism provides best-effort (Best-Effort) services, which cannot meet the requirements of real-time services and indicators such as delay and jitter
The PCF mechanism can provide delay-limited services, but there are two problems as follows: (1) In each non-competition period, the PC needs to poll all its neighbor nodes. For nodes that have no business to send at this time, poll It will cause unnecessary channel reservation; (2) The data between all nodes must be forwarded by PC, which increases the delay of data transmission and reduces the utilization efficiency of the channel

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  • Method for optimizing 802.11 centralized coordination function
  • Method for optimizing 802.11 centralized coordination function
  • Method for optimizing 802.11 centralized coordination function

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Embodiment Construction

[0023] Assumed application example: an 802.11-based wireless network, when the network traffic is not very busy, the optimized centralized coordination function can be used to obtain better network performance. Its specific implementation is described as follows:

[0024] (1) Configure two 802.11 wireless network cards for all nodes, use two independent channels, and stipulate that one of them is a control channel and the other is a business channel;

[0025] (2) A certain node is selected as the centralized controller PC. After the PC obtains the control right through the contention channel, it broadcasts a beacon frame on the control channel, and the network enters a non-competition period;

[0026] (3) The nodes in the network stop contending for the channel, and each judges whether there is data to be sent in the data buffer. If so, send an associated frame request to the PC through the control channel to join the polling;

[0027] (4) PC initializes the polling table ac...

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Abstract

The invention discloses a method for optimizing the performance of 802.11 wireless network centralized coordination function. Mainly aiming at two problems in the current 802.11 centralized coordination network: (1) in each non-compete period, a PC needs to poll all neighbor nodes, so that meaningless information channel reservation can be caused by polling the nodes without service to be transmitted; and (2) communication among all nodes are needed to be transferred by the PC, so that the time delay of data transmission is increased and the utilization ratio of the information channel is reduced, the invention provides a method for reducing the transmission time delay of the system and increasing the utilization ratio of the information channel with a separated control information channel and a service information channel, an optimized polling table construction strategy and an optimized data receiving and transmitting strategy. The method can effectively solve the two problems, and has the characteristics of flexibility and high efficiency.

Description

technical field [0001] The invention is a method for optimizing the centralized coordination function of an 802.11 wireless network, which belongs to the intersecting field of computer network and wireless communication. Background technique [0002] With the development of mobile communication technology and people's higher demands on the flexibility of working environment, WLAN has been more and more widely used in various fields. 802.11 is one of the mainstream technologies of WLAN at present. [0003] 802.11 is an international standard formulated by the Institute of Electrical and Electronics Engineers (IEEE) to regulate the physical layer (PHY) and medium access control layer (MAC) of wireless local area networks. The standard provides two MAC access mechanisms, which are Distributed Coordination Function (DCF, Distributed Coordination Function) and Centralized Coordination Function (PCF, Point Coordination Function). The distributed coordination function does not us...

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Application Information

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IPC IPC(8): H04W84/12H04B7/26
Inventor 王汝传孟翀孙力娟黄海平赵传信祝世雄王文胜康荣保
Owner NANJING UNIV OF POSTS & TELECOMM
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