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Medium access control in wireless local area network

An access control and medium technology, applied in wireless communication, data exchange network, data exchange through path configuration, etc., can solve the problems of complexity, restriction of commercial use, inefficiency of medium use, etc.

Inactive Publication Date: 2005-02-09
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this strategy, the PC can provide contention-free transmission opportunities to the stations that want to transmit data according to the polling table. Therefore, real-time services are provided in the wireless LAN, but due to the complexity of PCF implementation, inefficiency of medium usage, etc , restricting its commercial use

Method used

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  • Medium access control in wireless local area network
  • Medium access control in wireless local area network
  • Medium access control in wireless local area network

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Embodiment Construction

[0022] FIG. 1 is a diagram for explaining an access control mechanism of a DCF defined in the IEEE 802.11 standard.

[0023] As shown in Figure 1, DCF is an access control mechanism defined as an essential element in the IEEE 802.11 standard, which uses a contention-based algorithm known as CSMA / CA.

[0024] In a CSMA / CA based wireless LAN system, a station checks whether the medium is busy. If the medium is busy, the station waits for a predetermined time, then reduces its back-off time when the medium is still free. Therefore, the predetermined time during which each station waits to initiate traffic is called IFS. As shown in Figure 1, the MAC protocol service is roughly divided into three IFSs. DIFS, PIFS, and SIFS represent DCF interframe space, PCF interframe space, and short interframe space, respectively.

[0025] An example of a station using the DCF access control mechanism to transmit frames will be described below. A station using the DCF access control mechani...

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Abstract

A medium access control method of a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) based wireless LAN (Local Area Network) provides contention-free medium access authority to a station or access point receiving a request signal by: transmitting a request signal frame from an arbitrary station to another arbitrary station or to an access point via a medium occupied in transmission contention with a CSMA / CA algorithm using a DCF (Distributed Coordination Function) interframe space; and transmitting an acknowledgment signal frame from the station or the access point receiving the request signal frame to the station transmitting the request signal frame via an occupied medium using a short interframe space.

Description

technical field [0001] The present invention relates to a contention-based wireless LAN (Local Area Network) system and MAC (Media Access Control) protocol, more particularly, the present invention relates to contention-based request signals and Data is transmitted based on an exchange process between contending acknowledgment signals, thereby reducing medium access delays with two stations having equal transmission opportunities. Background technique [0002] The IEEE (Institute of Electrical and Electronics Engineers) wireless LAN standard follows the 1999 version of "Standard for Information technology-Telecommunications and information exchange between systems-Local and metropolitana area networks-Specific requirements-Parts 11: Wireless LAN Medium Access Control (MAC) and Physicai Layer (PHY) Specifications". [0003] Hereinafter, the wireless LAN standard of the IEEE mentioned above will be called the IEEE 802.11 standard. The IEEE 802.11 standard defines rules relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04L12/413
CPCH04W74/0816H04W74/08H04L12/28H04W88/02
Inventor 高成润朴柱龙全成俊金成宽尹勉基
Owner SAMSUNG ELECTRONICS CO LTD
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