SYSTEM AND METHOD FOR RECEIVED CHANNEL POWER INDICATOR (RCPI) MEASUREMENT

• US 20100150125A1
• Filed: 02/23/2010
• Published: 06/17/2010
• Est. Priority Date: 03/12/2003
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kwak, Joseph, Dick, Stephen G.
• Granted Patent: US 8,462,701 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336

Abstract

A received channel power indicator (RCPI) value is used as a measure of the received RF power in the selected channel, measured at the antenna connector. This parameter is a measure by the PHY sublayer of the received RF power in the channel measured over the PLCP preamble and over the entire received frame. RCPI is a monotonically increasing, logarithmic function of the received power level defined in dBm.

Claims

1. A method for receiving a received channel power indicator (RCPI) at an access point (AP), the method comprising:

transmitting a wireless signal;

receiving an n-bit RCPI parameter that is based on a measured radio frequency power of the wireless signal at a wireless transmit receive unit (WTRU) having a monotonically increasing logarithmic function, wherein n is a positive integer.

2. The method of claim 1 wherein the measured radio frequency power of the wireless signal is defined in dBm.

3. The method of claim 1 wherein the n-bit RCPI parameter is an 8 bit RCPI parameter.

4. The method of claim 1 wherein the n-bit RCPI parameter is determined as a scalar value in a range of 0 through 220.

5. The method of claim 1 wherein the measured radio frequency power of the wireless signal is rounded to a nearest 0.5 dB.

6. The method of claim 5 wherein the range used for the scalar value includes a 0 scalar value that corresponds to a power less than −

110 dBm and a 220 scalar value that corresponds to a power greater than −

0 dBm.

7. The method of claim 1 wherein the measured radio frequency power of the wireless signal is measured to an accuracy of +/−

5 dB.

8. A wireless access point (AP) comprising:

a transmitter configured to transmit a wireless signal;

a receiver configured to receive an n-bit received channel power indicator (RCPI) parameter that is based on a measured radio frequency power of the wireless signal at a wireless transmit receive unit (WTRU) having a monotonically increasing logarithmic function, wherein n is a positive integer.

9. The AP of claim 8 wherein the measured radio frequency power of the wireless signal is defined in dBm.

10. The AP of claim 8 wherein the n-bit RCPI parameter is an 8 bit RCPI parameter.

11. The AP of claim 8 wherein the n-bit RCPI parameter is a scalar value in a range of 0 through 220.

12. The AP of claim 11 wherein the measured radio frequency power of the wireless signal is rounded to a nearest 0.5 dB.

13. The AP of claim 12 wherein the range used for the scalar value includes a 0 scalar value that corresponds to a power less than −

110 dB and a 220 scalar value that corresponds to a power greater than −

0 dB.

14. The WTRU of claim 8 wherein the measured radio frequency power of the wireless signal is measured to an accuracy of +/−

5 dB.