Method for enhanced power saving on DCF based wireless networks

• US 7,167,732 B2
• Filed: 09/22/2003
• Issued: 01/23/2007
• Est. Priority Date: 05/12/2003
• Status: Active Grant

• Current Assignee: Ajou University Industry Cooperation Foundation
• Original Assignee: Ajou University Industry Cooperation Foundation
• Inventors: Ko, Young Bae, Kim, Jai Hoon, Choi, Jong Mu
• Primary Examiner(s): Kincaid; Lester G.
• Assistant Examiner(s): LAM, DUNG LE
• Application Number:
  US10/667,929
• Publication Number:
  US 20040228293A1
• Time in Patent Office: 1,219 Days
• Field of Search: 455/574, 455/343, 455/522, 455/343.4, 370/388, 370/311, 370/338, 340/7.36, 340/7.33, 340/7.32
• US Class Current: 455/574
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 74/02 Hybrid access
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for enhanced power saving on DCF based wireless networks is disclosed. The method divides a beacon transmitting section in an Announcement Traffic Indication Message (hereinafter, referred to as “ATIM”) window period defined by IEEE standard 802.11 according as there is a data packet to be sent or not and allows a terminal that has received the beacon to go to a doze state immediately according to beacon reception timing, thereby preventing unnecessary power consumption.

Claims

1. A method for reducing consumption power of terminals communicating with each other using a beacon interval divided into an Announcement Traffic Indication Message (ATIM) window period and a doze state period [according to IEEE standard 802.11] on Distributed Coordinated Function (DCF) based wireless networks, the method comprising the steps of:

(a) dividing an ATIM window period into an Earlier Time Slot (ETS) section and a Later Time Slot (LTS) section which are distinguished from each other;

(b) when a certain terminal has a data packet to be sent to another terminal, transmitting a beacon to each terminal during the ETS section, and when the terminal has no data packet to be sent to that other terminal, transmitting the beacon to each terminal during the LTS section; and

(c) when a terminal has received the beacon during the LTS section, allowing it to immediately change its state to the doze state without waiting for the doze state period.

2. The method as claimed in claim 1, wherein the ETS and LTS sections are maximum back-off time [defined by IEEE standard 802.11].