Patent ID: 8711763
Filing Date: 2014-04-29
Classification: H04B,H04L,H04W

Abstract:
1. A user terminal configured for operation in a wireless multiple-access communication system, comprising: a receiver to receive at least one broadcast message including information regarding configuration of at least two contention-based random access channels for a frame, said at least two contention-based random access channels include a first and second contention-based random access channels; a controller for determining an operating state of the user terminal indicating a current status of the user terminal, wherein the controller is operative to select the first contention-based random access channel and the second contention-based random access channel based on the determined operating state of the user terminal; and a transmitter configured to transmit a first message on the first contention-based random access channel when the user terminal is in a first operating state and to transmit a second message on the second contention-based random access channel when the user terminal is in a second operating state, wherein the first contention-based random access channel is configured for use by registered terminals for system access and the second contention-based random access channel is configured for use by registered/unregistered terminals for system access.