Method and apparatus for providing and utilizing a non-contention based channel in a wireless communication system
In a wireless communication system comprising at least one evolved Node-B (eNB) and a plurality of wireless transmit/receive units (WTRUs), a non-contention based (NCB) channel is established, maintained, and utilized. The NCB channel is allocated for use by one or more WTRUs in the system for utilization in a variety of functions, and the allocation is communicated to the WTRUs. The wireless communication system analyzes the allocation of the NCB channel as required, and the NCB channel is reallocated as required.
1. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
determining that there is uplink data to be transmitted;
transmitting a scheduling request over a non-contention based (NCB) uplink control channel based on determining that there is uplink data to be transmitted;
monitoring a downlink control channel based on transmitting the scheduling request over the NCB uplink control channel;
detecting that a transmission on the downlink control channel is intended for the WTRU based on a WTRU identifier indicated in the transmission on the downlink control channel, wherein the transmission on the downlink control channel comprises an allocation of an uplink shared channel; and
transmitting the uplink data over the uplink shared channel in accordance with the allocation of the uplink shared channel received on the downlink control channel.
2. The method of claim 1 , wherein the NCB uplink control channel is implemented in a single carrier frequency-division multiple-access (SC-FDMA) wireless communication system.
3. The method of claim 1 , further comprising receiving an allocation of the NCB uplink control channel from an evolved Node B (eNB), wherein the allocation of the NCB uplink control channel comprises a configuration for transmitting scheduling requests over the NCB uplink control channel, and the configuration indicates a periodicity assigned to the WTRU for transmitting scheduling requests on the NCB uplink control channel.
4. The method of claim 1 , wherein the transmission on the downlink control channel comprises an explicit indication of one or more physical attributes used for transmitting the uplink data over the uplink shared channel.
5. The method of claim 4 , wherein the one or more physical attributes explicitly indicated by the transmission on the downlink control channel comprise a resource block assignment for the uplink shared channel.
6. The method of claim 1 , wherein the NCB uplink control channel is a combination of time multiplexed, frequency multiplexed, and code multiplexed.
7. The method of claim 1 , wherein the WTRU is assigned sub-carrier resources of the NCB uplink control channel for transmission of the scheduling request.
8. The method of claim 1 , wherein the scheduling request comprises a burst, wherein presence of the burst on the NCB uplink control channel is indicative of a request for uplink transmission resources by the WTRU.
9. The method of claim 1 , wherein the WTRU receives resource information regarding a target cell NCB uplink control channel when handing over from a source cell to a target cell, the resource information regarding the target cell NCB uplink control channel being received via the source cell.
10. A device comprising a processor and memory, the processor and memory configured:
receive a scheduling request over a non-contention based (NCB) uplink control channel, the scheduling request being received on resources of the NCB uplink control channel that were assigned to a wireless transmit/receive unit (WTRU);
determine that the WTRU has uplink data to be transmitted based on receiving the scheduling request on resources of the NCB uplink control channel that were assigned to the WTRU;
send a transmission on a downlink control channel that is intended for the WTRU based on receiving the scheduling request, wherein a WTRU identifier indicated in the transmission on the downlink control channel indicates that the transmission on the downlink control channel is intended for the WTRU, and the transmission on the downlink control channel comprises an allocation of an uplink shared channel; and
receive the uplink data over the uplink shared channel in accordance with the allocation of the uplink shared channel sent on the downlink control channel.
11. A wireless transmit/receive unit (WTRU) comprising a processor and memory, the processor and memory configured to:
determine that there is uplink data to be transmitted;
transmit a scheduling request over a non-contention based (NCB) uplink control channel based on determining that there is uplink data to be transmitted;
monitor a downlink control channel based on transmitting the scheduling request over the NCB uplink control channel;
detect that a transmission on the downlink control channel is intended for the WTRU based on a WTRU identifier indicated in the transmission on the downlink control channel, wherein the transmission on the downlink control channel comprises an allocation of an uplink shared channel; and
transmit the uplink data over the uplink shared channel in accordance with the allocation of the uplink shared channel received on the downlink control channel.
12. The WTRU of claim 11 , wherein the NCB uplink control channel is implemented in a single carrier frequency-division multiple-access (SC-FDMA) wireless communication system.
13. The WTRU of claim 11 , further comprising receiving an allocation of the NCB uplink control channel from an evolved Node B (eNB), wherein the allocation of the NCB uplink control channel comprises a configuration for transmitting scheduling requests over the NCB uplink control channel, and the configuration indicates a periodicity assigned to the WTRU for transmitting scheduling requests on the NCB uplink control channel.
14. The WTRU of claim 11 , wherein the transmission on the downlink control channel comprises an explicit indication of one or more physical attributes used for transmitting the uplink data over the uplink shared channel.
15. The WTRU of claim 14 , wherein the one or more physical attributes explicitly indicated by the transmission on the downlink control channel comprise a resource block assignment for the uplink shared channel.
16. The WTRU of claim 11 , wherein the NCB uplink control channel is a combination of time multiplexed, frequency multiplexed, and code multiplexed.
17. The WTRU of claim 11 , wherein the WTRU is assigned sub-carrier resources of the NCB uplink control channel for transmission of the scheduling request.
18. The WTRU of claim 11 , wherein the scheduling request comprises a burst, wherein presence of the burst on the NCB uplink control channel is indicative of a request for uplink transmission resources by the WTRU.
19. The WTRU of claim 11 , wherein the WTRU receives resource information regarding a target cell NCB uplink control channel when handing over from a source cell to a target cell, the resource information regarding the target cell NCB uplink control channel being received via the source cell.