Method and apparatus for transmission of configuration information
A method and apparatus reduce latency of Long Term Evolution (LTE) uplink transmissions. Configuration information regarding a downlink control information message for a physical uplink shared channel transmission can be transmitted. The downlink control information message can be sent on a physical downlink control channel in a first subframe to a user equipment. The downlink control information message can indicate a plurality of resource assignments in a second subframe for an uplink carrier from which the user equipment selects one resource assignment for transmission on the uplink carrier. The downlink control information message can be cyclic redundancy check scrambled by a radio network temporary identifier that is indicated via higher layers that are higher than a physical layer. A data packet can be received from the user equipment on the physical uplink shared channel in a resource of a selected resource assignment in the second subframe on the uplink carrier. The selected resource assignment can be selected from the plurality of resource assignments.
1. A method in an apparatus, the method comprising:
transmitting configuration information regarding a downlink control information message for a physical uplink shared channel transmission;
sending the downlink control information message on a physical downlink control channel in a first subframe to a user equipment, the downlink control information message indicating a plurality of resource assignments in a second subframe for an uplink carrier from which the user equipment selects one resource assignment for transmission on the uplink carrier, where the downlink control information message is cyclic redundancy check scrambled by a radio network temporary identifier that is indicated via higher layers that are higher than a physical layer; and
receiving, from the user equipment, a data packet on the physical uplink shared channel in a resource of a selected resource assignment in the second subframe on the uplink carrier, where the selected resource assignment is selected from the plurality of resource assignments.
2. The method according to claim 1 , wherein each resource assignment of the plurality of resource assignments has a same number of resource blocks.
3. The method according to claim 1 , wherein a cyclic shift for a demodulation reference signal for the received data packet is based on a cell radio network temporary identifier of the user equipment that sent the data packet.
4. The method according to claim 1 , wherein a cyclic shift for a demodulation reference signal for the received data packet is based on at least one field indicated in the downlink control information message.
5. The method according to claim 1 , wherein an orthogonal cover code sequence for a demodulation reference signal for the received data packet is based on a cell radio network temporary identifier of the user equipment that sent the data packet.
6. The method according to claim 1 , wherein an orthogonal cover code sequence for a demodulation reference signal for the received data packet is based on at least one field indicated in the downlink control information message.
7. The method according to claim 1 , wherein a number of resource assignments is explicitly indicated in the downlink control information message.
8. The method according to claim 1 , wherein a number of resource assignments is implicitly indicated in the downlink control information message.
9. The method according to claim 1 , wherein a selection criterion for selecting the selected resource assignment is a random selection of the resource assignment from the plurality of resource assignments.
10. The method according to claim 1 , wherein a selection criterion for selecting the selected resource assignment is based on at least one parameter measured by the user equipment.
11. The method according to claim 1 ,
wherein the user equipment has a user equipment identifier, and
wherein a selection criterion for selecting the selected resource assignment is based on at least a hashing function based on the user equipment identifier.
12. The method according to claim 1 , wherein the user equipment has a cell radio network temporary identifier and a contention-based cell radio network temporary identifier configured via higher layers and the downlink control information is scrambled by the contention-based cell radio network temporary identifier.
13. The method according to claim 1 , wherein a scrambling initialization for the data packet received on the physical uplink shared channel is based on at least a determined cyclic shift for the demodulation reference signal for transmission of the data packet by the user equipment.
14. The method according to claim 1 , wherein a scrambling initialization for the data packet received on the physical uplink shared channel is based on at least a determined orthogonal cover code sequence for the demodulation reference signal for transmission of the data packet by the user equipment.
15. An apparatus comprising:
a controller that controls operations of the apparatus; and
a transceiver that
transmits configuration information regarding a downlink control information message for a physical uplink shared channel transmission,
sends the downlink control information message on a physical downlink control channel in a first subframe to a user equipment, the downlink control information message indicating a plurality of resource assignments in a second subframe for an uplink carrier from which the user equipment selects one resource assignment for transmission on the uplink carrier, where the downlink control information message is cyclic redundancy check scrambled by a radio network temporary identifier that is indicated via higher layers that are higher than a physical layer, and
receives, from the user equipment, a data packet on the physical uplink shared channel in a resource of a selected resource assignment in the second subframe on the uplink carrier, where the selected resource assignment is selected from the plurality of resource assignments.
16. The apparatus according to claim 15 , wherein each resource assignment of the plurality of resource assignments has a same number of resource blocks.
17. The apparatus according to claim 15 , wherein a cyclic shift for a demodulation reference signal for the received data packet is based on a cell radio network temporary identifier of the user equipment that sent the data packet.
18. The apparatus according to claim 15 , wherein least one field indicated in the downlink control information message includes a parameter for determining a demodulation reference signal for transmission of the data packet by the user equipment.
19. The apparatus according to claim 15 ,
wherein the controller determines a selection criterion for selecting a resource assignment from the plurality of resource assignments based on at least a hashing function based on an identifier of the user equipment; and
wherein the transceiver sends the selection criterion for selecting the resource assignment to the user equipment.
20. The apparatus according to claim 15 , wherein the downlink control information message is scrambled by a contention-based cell radio network temporary identifier of the user equipment, where the contention-based cell radio network temporary identifier is configured via higher layers.