System and method for received channel power indicator (RCPI) measurement

• US 7,668,132 B2
• Filed: 03/12/2004
• Issued: 02/23/2010
• 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.
• Primary Examiner(s): Kumar; Pankaj
• Assistant Examiner(s): Duong; Duc T
• Application Number:
  US10/799,974
• Publication Number:
  US 20050036570A1
• Time in Patent Office: 2,174 Days
• Field of Search: 370/328, 370/338, 370/400, 370/401, 455/13.4, 455/151.1, 455/154.1, 455/522, 455/41.2, 455/41.3, 455/67.11, 455/67.13, 4552261-2264
• US Class Current: 370/328
• 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 determining a received channel power indicator (RCPI) in a wireless transmit/receive unit (WTRU), the method comprising:

measuring a radio frequency power of a received ;

determining an n-bit RCPI parameter from the measured radio frequency power, wherein the RCPI parameter is determined using a monotonically increasing logarithmic function, wherein n is a positive integer; and

transmitting the determined n-bit RCPI parameter.

2. The method of claim 1 wherein the radio frequency power of the received signal is measured by a physical (PHY) sublayer.

3. The method of claim 2 wherein a direct sequence spread spectrum (DSSS) PHY sublayer is used as the PHY sublayer.

4. The method of claim 2 wherein an orthogonal frequency division multiplex (OFDM) PHY sublayer is used as the PHY sublayer.

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

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

7. The method of claim 5 wherein the measured radio frequency power of the received signal is measured to an accuracy of ±

5 dB.

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

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

10. The method of claim 9 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.

11. The method of claim 1, wherein the radio frequency power of the received signal is measured over an entire frame.

12. The method of claim 11, wherein the entire frame includes a Physical Layer Convergence Protocol (PLCP) preamble.

13. The method of claim 1 wherein the radio frequency power of the received signal is measured at an antenna connector.

14. A wireless transmit/receive unit (WTRU) comprising:

a processor configured to;

measure a radio frequency power of a received signal;

determine an n-bit received channel power indicator (RCPI) parameter from the measured radio frequency power, wherein the RCPI parameter is determined using a monotonically increasing logarithmic function, where n is a positive integer; and

a transmitter configured to transmit the determined n-bit RCPI parameter.

15. The WTRU of claim 14 wherein the radio frequency power of the received signal is measured by a physical (PHY) sublayer.

16. The WTRU of claim 15 wherein the PHY sublayer is a direct sequence spread spectrum (DSSS) PHY sublayer.

17. The WTRU of claim 15 wherein the PHY sublayer is an orthogonal frequency division multiplex (OFDM) PHY sublayer.

18. The WTRU of claim 14 wherein the measured radio frequency power of the received signal is defined in dBm.

19. The WTRU of claim 18 wherein the measured radio frequency power of the received signal is rounded to a nearest 0.5 dB.

20. The WTRU of claim 19 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.

21. The WTRU of claim 18 wherein the measured radio frequency power of the received signal is measured to an accuracy of ±

5 dB.

22. The WTRU of claim 14 wherein the n-bit RCPI parameter is an 8 bit RCPI parameter.

23. The WTRU of claim 14 wherein the n-bit RCPI parameter is a scalar value in a range of 0 through 220.

24. The WTRU of claim 14, wherein the radio frequency power of the received signal is measured over an entire frame.

25. The WTRU of claim 24, wherein the entire frame includes a Physical Layer Convergence Protocol (PLCP) preamble.

26. The WTRU of claim 14 wherein the radio frequency power of the received signal is measured at an antenna connector.