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Method for an ETPC in an 802.11 WLAN

IP.com Disclosure Number: IPCOM000019309D
Publication Date: 2003-Sep-10
Document File: 3 page(s) / 148K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an extended transmit power control (ETPC) protocol in an 802.11 wireless local area network (WLAN). Benefits include improved functionality, improved power performance, and improved performance.

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Method for an ETPC in an 802.11 WLAN

Disclosed is a method for an extended transmit power control (ETPC) protocol in an 802.11 wireless local area network (WLAN). Benefits include improved functionality, improved power performance, and improved performance.

Background

The IEEE 802.11 standard is defined in, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications,” dated 1999. The protocol does not have power control. The proposed 802.11h extension defines only maximum transmission (Tx) power.

General description

The disclosed method is extended transmit power control (ETPC) protocol for 802.11-standard WLANs. The disclosed method enables the detection of hidden nodes and prevents creating hidden nodes. The result is improved power consumption without loss in throughput.

Advantages

         The disclosed method provides advantages, including:

•         Improved functionality due to detecting existing hidden nodes

•         Improved functionality due to minimizing power consumption without loss of performance from creating new hidden nodes

•         Improved power performance due to providing power in the basic service set (BSS) because of Tx power optimization

•         Improved performance due to minimizing the interference between adjacent BSS members

Detailed description

The disclosed method includes an ETPC frame exchange (see Figure 1). It occurs in three stages:

1.         Stations (STAs) send Tx probe responses to the access point (AP)

2.         AP collects stations’ tables from the BSS members
3.         AP processes the data from the STAs and sends reports

Stage 1: STAs send Tx probe responses to the AP

The AP broadcasts a management frame, ETPC_TxProbeRequest:

AP è broadcast to all STA: ETPC_TxProbeRequest

ETPC_TxProbeRequest informs stations to send back the frame ETPC_TxProbeResponse:

STA è AP : ETPC_TxProbeResponse

STA sends ETPC_TxProbeResponse to AP at the maximum allowed power at the minimal basic data rate. This procedure guarantees the maximum number of stations in the BSS receive this packet. It contains the optional parameter with the value of Tx power used by a station to send it. If AP does not receive the ETPC_TxProbeResponse from a station, AP can send an individual ETPC_TxProbeRequest to the station.

Stage 2: AP collects stations’ tables from the BSS members

AP broadcasts a management frame, called ETPC_StationTableRequest:

AP è STA: ETPC_StationsTableRequest

ETPC_StationTableRequest contains the request from the AP to a station to send the list of all sta...