System and method for received channel power indicator (RCPI) measurement
View Patent ↗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.
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.