Path loss measurements in wireless communications

• US 7,372,898 B2
• Filed: 12/09/2003
• Issued: 05/13/2008
• Est. Priority Date: 12/11/2002
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shin, Sung-Hyuk, Dick, Stephen G., Rudolf, Marian
• Primary Examiner(s): Odom; Curtis B.
• Application Number:
  US10/731,457
• Publication Number:
  US 20040170132A1
• Time in Patent Office: 1,617 Days
• Field of Search: 375/219, 370/280
• US Class Current: 375/219
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure

Abstract

A method for determining uplink power requirements for a transceiver in a wireless communication system includes obtaining measurements from a beacon signal occupying a first timeslot in a frame; obtaining measurements from at least one additional channel having a known transmitted signal strength and occupying a second timeslot in the frame; and utilizing the measurements to determine a path loss estimate.

Claims

1. A method for determining uplink power requirements in a transceiver where there is timeslot separation between uplink and downlink timeslots, the method comprising:

receiving a beacon channel;

receiving a power offset value representing a difference in transmission power between the beacon channel and a physical channel;

obtaining received signal code power (RSCP) measurements of each of the beacon channel and the physical channel; and

determining a path loss based on the RSCP measurements and the power offset value.

2. The method of claim 1 further comprising:

employing the path loss for use in an uplink timeslot.

3. The method of claim 1 wherein the determining the path loss is by subtracting the RSCP of the beacon channel from a transmission power of the beacon channel.

4. The method of claim 1 wherein a transmission power of the physical channel is constant.

5. A wireless transmit/receive unit (WTRU) for determining uplink power requirements where there is timeslot separation between uplink and downlink timeslots, comprising:

a receiver circuit for receiving a beacon channel, an additional channel and a power offset value representing a difference in transmission power between the beacon channel and the additional channel;

a measurement circuit for obtaining received signal code power (RSCP) measurements of each of the beacon channel and the additional channel; and

a path loss circuit for determining a path loss responsive to the RSCP measurements and the power offset value.

6. The WTRU of claim 5 further comprising a transmitter circuit for transmitting in an uplink timeslot using the determined path loss.

7. The WTRU of claim 5 wherein the path loss circuit determines the path loss by subtracting the RSCP of the beacon channel from a transmission power of the beacon channel.

8. The WTRU of claim 5 wherein a transmit power of the additional channel is constant.