Uplink control signaling in cellular telecommunication system
A method, apparatus, and computer program for controlling allocation of control message fields in uplink transmission in a cellular telecommunication system are presented. Uplink control message fields are allocated to the resources of a physical uplink shared traffic channel according to an uplink transmission scheme selected for a user terminal. The control message fields are allocated so that transmission performance of the control messages is optimized for the selected uplink transmission scheme.
1. A method performed by a user terminal of a cellular telecommunication system comprising:
receiving, by the user terminal, an indication of an uplink transmission scheme to be used for transmission on a physical uplink shared channel (PUSCH), wherein the indication indicates either a single-antenna transmission scheme or a multi-antenna transmission scheme;
determining PUSCH resources of the user terminal for an uplink subframe;
allocating at least one control message field to the resources of the PUSCH according to the uplink transmission scheme; and
on a condition that the uplink transmission scheme is the multi-antenna transmission scheme, transmitting in the uplink subframe one or more of the at least one control message field via multiple antennas using transmit diversity multi-antenna transmission and concurrently transmitting in the uplink subframe a plurality of different traffic data via the multiple antennas using multi-stream spatial multiplexing.
2. An apparatus for use in a cellular telecommunication system, the apparatus comprising:
a receiver configured to receive an indication of an uplink transmission scheme to be used for transmission on a physical uplink shared channel (PUSCH), wherein the indication indicates either a single-antenna transmission scheme or a multi-antenna transmission scheme;
multiple antennas;
a processor configured to:
determine PUSCH resources of the apparatus for an uplink subframe; and
allocate at least one control message field to the resources of the PUSCH according to the uplink transmission scheme; and
a transmitter configured to, on a condition that the uplink transmission scheme is the multi-antenna transmission scheme:
transmit in the uplink subframe one or more of the at least one control message field via the multiple antennas using transmit diversity multi-antenna transmission; and
transmit in the uplink subframe concurrently with transmitting the one or more of the at least one control message field a plurality of different traffic data via the multiple antennas using multi-stream spatial multiplexing.
3. A user terminal of the cellular telecommunication system comprising the apparatus according to claim 2 .
4. A non-transitory computer readable medium storing program instructions for execution by at least one processor, the program instructions comprising:
program instructions for receiving an indication of an uplink transmission scheme to be used for transmission on a physical uplink shared channel (PUSCH), wherein the uplink transmission scheme is for a user terminal of a cellular telecommunication system, and wherein the indication indicates either a single-antenna transmission scheme or a multi-antenna transmission scheme;
program instructions for determining PUSCH resources of the user terminal for an uplink subframe;
program instructions for allocating at least one control message field to the resources of the PUSCH according to the uplink transmission scheme; and
program instructions for transmitting in the uplink subframe, on a condition that the uplink transmission scheme is the multi-antenna transmission scheme, one or more of the at least one control message field via multiple antennas using transmit diversity multi-antenna transmission and concurrently transmitting in the uplink subframe a plurality of different traffic data via the multiple antennas using multi-stream spatial multiplexing.