Method of controlling power of wireless access node in a wireless LAN system

• US 20040180652A1
• Filed: 03/04/2004
• Published: 09/16/2004
• Est. Priority Date: 03/13/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Tae-Jin, Jang, Kyung-Hun, Lee, Ok-Seon, Yang, Duck-Yong
• Granted Patent: US 7,539,506 B2
• Time in Patent Office: Days
• US Class Current: 455/426.2
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A power control method in a wireless access node communicable with a plurality of wireless terminals in a wireless LAN system. Upon request for initial communication from a wireless terminal, the wireless access node transmits a power report request message to the plurality of wireless terminals and determines its transmit power based on a power report signal requesting the highest power among power report signals received from connected wireless terminals. The wireless access node communicates with the connected wireless terminals using the determined transmit power.

Claims

1. In a wireless LAN (Local Area Network) system having a wireless access node communicable with a plurality of wireless terminals, a power control method in the wireless access node, comprising the steps of:

(1) upon requesting initial communication from a wireless terminal, transmitting a power report request message to the plurality of wireless terminals;

(2) determining the transmit power of the wireless access node based on a power report signal requesting the highest power among power report signals received from connected wireless terminals; and

(3) communicating with the connected wireless terminals using the determined transmit power.

2. The power control method of claim 1, wherein step (1) further comprising the step of waiting for a time period between a time when the initial communication is requested and a predetermined time for transmitting the power report request message.

3. The power control method of claim 1, wherein step (2) further comprising the step of upon receipt of the power report signals, storing values set in the power report signals for the connected wireless terminals in an access list and using the stored values for a next power adjustment operation.

4. The power control method of claim 3, further comprising the steps of:

if no signals are received from a wireless terminal until a time-out signal is detected from delete timers set for the respective connected wireless terminals, deciding whether a link between the wireless terminal and the wireless access node has been disconnected; and

if it is decided that the link between the wireless terminal and the wireless access node has been disconnected, resetting the transmit power according to the highest of power levels requested by the connected wireless terminals.

5. The power control method of claim 1, wherein step 2 further comprising the step of determining the transmit power as the sum of the requested highest power and a predetermined margin.

6. The power control method of claim 1, further comprising the steps of:

if a new wireless terminal requests a connection during the communication between the wireless access node and the connected wireless terminals, transmitting a power report request signal to the new wireless terminal; and

resetting the transmit power according to the highest of power values set in the power report signals from the connected wireless terminals and a power report signal from the new wireless terminal.