Radio local net work system and method with increased central coordination control

A wireless local area network and coordinated control technology, applied in transmission systems, wireless communications, digital transmission systems, etc., can solve problems such as increasing real-time service transmission delays, and achieve the effect of reducing transmission delays

Inactive Publication Date: 2004-07-14
KONINK PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This causes an increase in the transmission delay of real-time services

Method used

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  • Radio local net work system and method with increased central coordination control
  • Radio local net work system and method with increased central coordination control
  • Radio local net work system and method with increased central coordination control

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Embodiment Construction

[0018] like figure 2 As shown, at the beginning of the contention-free period (CFP), the central coordinator obtains the control right of the transmission medium after the PIFS period, and sends a beacon (Beacon) frame. After the initial beacon frame, the central coordinator waits for a period of SIFS and then starts polling the first mobile terminal STA1 in the polling list. Assuming STA1 has no data to send, it does not respond to PC's polling. And, STA1 sets its NAV to SPIFS, and freezes its NAV value until the mobile terminal has data to send.

[0019] Since the central coordinator does not receive any response from STA1, it starts polling the next mobile terminal STA2 in the polling list. When the mobile terminal STA2 is polled, assuming that STA1 has data to send at this time, STA1 starts to listen to the transmission medium. Therefore, when the central coordinator polls and the transmission medium starts to be idle, STA1 starts to count down. The idle time of the t...

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Abstract

This invention discloses a method for strengthening central coordination control in a radio LAN system in TEEE 802.11 PCF which provides unracing data frame transfer. This invention introduces a racing structure in PCF. When a central coordinator polls a mobile terminal not ready to send data, which does not respond the CF- poll frame and regulates its NAV value to be a special value-SPIFS, when the data of the terminal is ready it races for the control power to transmission medium and if it detects, the transmission medium has SPIFS long idle time in this unracing period, it gets the control power to transmission medium to begin sending data.

Description

technical field [0001] The invention relates to the field of wireless local area network, in particular to a wireless local area network system and method with enhanced central coordination control. Background technique [0002] The IEEE802.11 wireless local area network standard is being widely accepted and rapidly applied to various occasions. The framework of the transmission medium access control (MAC) layer of IEEE802.11 includes two coordination control modes, namely distributed coordination control mode (DCF) and central coordination control mode (Point Coordinator Function, PCF). These two ways coexist in the wireless local area network system of IEEE802.11. The central coordination control method can provide frame transmission without contention, so it can be used to support real-time services such as voice and video. In this access mode, a central coordinator (Point Coordinator, PC) is used, and this coordinator will act as a base s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L12/26H04L12/28H04W74/06H04W84/12
CPCH04W74/02H04W84/12H04W74/06H04L12/28
Inventor 田建波贾群力
Owner KONINK PHILIPS ELECTRONICS NV
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