A method for improving the WLAN energy-saving efficiency

Abstract

The invention relates to the wireless LAN technical field, a method for improving the wireless LAN energy-saving efficiency, including: time drive and message drive combination based energy-saving mode. When the active website wants to send the data, firstly send the RTS message to the destination site, after the destination site received the RTS message, send the CTS message to the source site, in which, both the RTS and CTS have the time required for the subsequent data exchanging; according to the message drive energy-saving mode, other sites may be entered into the sleep status according to the transmission time specified by the RTS/CTS message mentioned above; after the data exchanging completed, the sleep site is awaken; if the medium is idle within the specified time TIDLE, indicates that all websites have no data for sending, then close the ATIM window in advance, all sites entered into the sleep status to wait for the next BI period for awaking. The TIDLE value equals to the DIFS value specified in IEEE 802.11.

Description

technical field [0001] The invention relates to the technical field of wireless local area networks, in particular to a method for improving the energy saving efficiency of IEEE 802.11 AdHoc wireless local area networks. Background technique [0002] The network structure of IEEE 802.11 WLAN (Wireless Local Area Networks, WLANs) is divided into two types: one is a non-central network, also known as an Ad-hoc network; the other is a central network, also known as an infrastructure network. ). The centerless network (no AP network) is also called a peer-to-peer network. The service area it covers is called IBSS (IndependentBasic Service Set). The peer-to-peer network is used for one wireless workstation (STA, Station) and another or more other wireless The direct communication of the workstation, the network cannot be connected to the wired network, and can only be used independently. This is the simplest wireless local area network structure. Centralized network is a networ...

AI Technical Summary

Problems solved by technology

[0005] One is that it is difficult to set the ATIM window properly. If the ATIM window is set too large, the station cannot send data or enter the sleep state immediately after the ATIM frame and ACK frame exchange is completed. It must wait for the end of the ATIM window; if the ATIM window is set If it is too small, it is possible that ATIM frames and ACK frames may not be exchanged in time

[0006] Second, in the data exchange window behind the ATIM window, even if the station has finished sending or receiving, it cannot enter the sleep state, but must remain active until the end of the frame interval BI, which undoubtedly reduces energy-saving efficiency

When the number of stations with messages to send increases, the energy-saving efficiency drops sharply, because after the ATIM window ends, the stations with messages to send or receive are always in an active state waiting to send or receive messages

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