Strict priority distributed coordination function in wireless networks

a wireless network and distributed coordination technology, applied in the field of wireless data communication systems, can solve the problems of unpredictable delays and jitters of multimedia content that is transmitted by a best-effort service packet transmission method

Active Publication Date: 2006-04-20
TAHOE RES LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The CSMA / CA scheme used by the DCF mode is a best-effort service because it does not provide a mechanism to ensure quality of service (QoS) for time-bounded packet transmissions.
Multimedia content that is transmitted by a best-effort service packet transmission method may be subject to unpredictable delays and jitters.
First, due to the random nature of the Backoff Time, neither of these methods guarantee that a high priority packet will always be transmitted before a low priority packet.

Method used

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  • Strict priority distributed coordination function in wireless networks
  • Strict priority distributed coordination function in wireless networks
  • Strict priority distributed coordination function in wireless networks

Examples

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Embodiment Construction

[0017] Embodiments of a system and method for prioritizing packet transmissions among stations in a WLAN are described in detail herein. For the purposes of the invention, a station is any device that can be connected to a WLAN including, but not limited to, personal computers, handheld scanners, printers, personal digital assistants, etc. In the following description, numerous specific details are provided in order to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

[0018] Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connecti...

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Abstract

A system and method for prioritizing the transmission of packets in a wireless local area network. A station selects a packet from local priority queuing and identifies the priority bits of the packet. The station declares the priority of the selected packet based on the binary value of the priority bits. If the station detects that another station has selected a packet with a higher priority, then the station ceases to contend for transmission during the current transmission cycle.

Description

FIELD OF THE INVENTION [0001] This invention relates to wireless data communication systems. More particularly, this invention relates to a method of prioritizing packet transmissions between stations in a wireless local area network. BACKGROUND OF THE INVENTION [0002] Wireless local area networks (WLAN) are generally known in the art. For example, one embodiment of a WLAN is described in the IEEE 802.11 standard, entitled “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, 1999 Edition.” The IEEE 802.11 standard specifies both the PHY layer and the MAC sub-layer of the Open Systems Interconnection (OSI) Reference Model of the International Standards Organization (ISO). [0003] The MAC protocol specified by the IEEE 802.11 standard can operate in a distributed coordination function (DCF) mode. The DCF mode governs access to the communications medium through a carrier sense multiple access with collision avoidance (CSMA / CA) scheme. FIG. 1 illustrates the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04J1/16H04L12/28H04L12/56
CPCH04W74/0866
Inventor JANCZAK, TOMASZ
Owner TAHOE RES LTD
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