Multiplex communications – Channel assignment techniques – Carrier sense multiple access
Reexamination Certificate
2009-08-28
2011-11-29
Lee, Andrew (Department: 2472)
Multiplex communications
Channel assignment techniques
Carrier sense multiple access
C370S462000
Reexamination Certificate
active
08068511
ABSTRACT:
A method and an apparatus for sending a signal on a contentious feedback channel for a downlink shared service and for estimating a number of wireless transmit/receive units (WTRUs) are disclosed. When a transmission criterion associated with a physical random access feedback channel (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 a number of the WTRUs based on a 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.
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Cave Christopher R.
Mariner Paul
Reznik Alexander
Zeira Eldad M.
InterDigital Patent Holdings, Inc.
Lee Andrew
Volpe and Koenig P.C.
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