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 equipment, the method comprising:
determining a first number of coded symbols to be allocated to a first control message field in a physical uplink shared traffic channel (PUSCH) based on a first modulation and coding scheme (MCS) offset, wherein the first number of coded symbols is a function of at least: the first MCS offset, a number of bits of the first control message field, and a number of sub-carriers carrying the PUSCH, and further wherein the first number of coded symbols is directly proportional to the number of sub-carriers carrying the PUSCH; and
transmitting, to a base station, the first control message field based on the first number of coded symbols.
2 . The method of claim 1 , further comprising:
determining a second number of coded symbols to be allocated to a second control message field in the PUSCH based on a second MCS offset; and
transmitting the second control message field based on the second number of coded symbols.
3 . The method of claim 2 , wherein the first control message field is a hybrid automatic repeat request (HARQ) acknowledgement (ACK) field and the second control message field is either a rank indicator (RI) field or a channel quality indicator (CQI) field.
4 . The method of claim 2 , wherein the first control message field is a hybrid automatic repeat request (HARQ) acknowledgement (ACK) field and the second control message field indicates a channel quality.
5 . The method of claim 3 , wherein the first MCS offset is different than the second MCS offset.
6 . The method of claim 4 , wherein the first MCS offset is different than the second MCS offset.
7 . The method of claim 1 , wherein the first MCS offset corresponds to an offset between reception quality of traffic data transmitted in the PUSCH and control data transmitted in the first control message field.
8 . The method of claim 1 , wherein the first control message field is channel coded with a channel coding scheme corresponding to the first MCS offset.
9 . The method of claim 1 , wherein the first MCS offset is based on a selected transmission scheme, wherein the selected transmission scheme is selected from a plurality of transmission schemes including spatial multiplexing and transmit diversity.
10 . A user equipment (UE) comprising:
a processor configured to determine a first number of coded symbols to be allocated to a first control message field in a physical uplink shared traffic channel (PUSCH) based on a first modulation and coding scheme (MCS) offset, wherein the first number of coded symbols is a function of at least: the first MCS offset, a number of bits of the first control message field, and a number of sub-carriers carrying the PUSCH, and further wherein the first number of coded symbols is directly proportional to the number of sub-carriers carrying the PUSCH; and
a transmitter configured to transmit, to a base station, the first control message field based on the first number of coded symbols.
11 . The UE of claim 10 , wherein:
the processor is further configured to determine a second number of coded symbols to be allocated to a second control message field in the PUSCH based on a second MCS offset; and
the transmitter is further configured to transmit the second control message field based on the second number of coded symbols.
12 . The UE of claim 11 , wherein the first control message field is a hybrid automatic repeat request (HARQ) acknowledgement (ACK) field and the second control message field is either a rank indicator (RI) field or a channel quality indicator (CQI) field.
13 . The UE of claim 11 , wherein the first control message field is a hybrid automatic repeat request (HARQ) acknowledgement (ACK) field and the second control message field indicates a channel quality.
14 . The UE of claim 12 , wherein the first MCS offset is different than the second MCS offset.
15 . The UE of claim 13 , wherein the first MCS offset is different than the second MCS offset.
16 . The UE of claim 10 , wherein the first MCS offset corresponds to an offset between reception quality of traffic data transmitted in the PUSCH and control data transmitted in the first control message field.
17 . The UE of claim 10 , wherein the first control message field is channel coded using a channel coding scheme corresponding to the first MCS offset.
18 . The UE of claim 10 , wherein the first MCS offset is based on a selected transmission scheme, wherein the selected transmission scheme is selected from a plurality of transmission schemes including spatial multiplexing and transmit diversity.