To provide a method and an apparatus for sending a signal on a contentious feedback channel for a downlink shared service and for estimating the number of WTRUs.
When a transmission criterion associated with a P-RAFCH is satisfied, a physical resource is randomly selected among a plurality of physical resources assigned for the P-RAFCH and a pre-configured signal is sent using the selected physical resource. A Node-B receives the pre-configured signal from a plurality of WTRUs and calculates the number of the WTRUs on the basis of the number of used physical resources. The transmission criterion is at least one of successful reception of a data packet on a downlink physical channel, successful reception of a data block on a data service, reception of a signaling command, occurrence of a measurement event, and failure to receive a transmission after a specified number of times.
ELDAD M ZEIRA
CHRISTOPHER R CAVE
PAUL MARNIER
| JP2007534236A | 2007-11-22 |
| WO2001078324A1 | 2001-10-18 | |||
| WO2008045471A2 | 2008-04-17 |