Methods, systems, and devices for modulation and coding scheme signaling for common control channel
Embodiments of the present disclosure describe methods, systems, and devices for modulation and coding scheme signaling for a common control channel. Various embodiments may include restricting transmit block size selection for downlink control information format 1A having a cyclic-redundancy check scrambled by a paging radio network temporary identifier, a system information radio network temporary identifier, or a random access radio network temporary identifier. Other embodiments may be described or claimed.
1. One or more non-transitory computer-readable media having instructions that, when executed by a user equipment (UE) that is configured to process a 256-quadrature amplitude modulation (QAM) transmission, cause the UE to:
receive downlink control information (DCI) from an evolved node B (eNB), wherein the DCI references a row of a transport block size (TB S) table, the row being greater than 26 and associated to 256-QAM;
determine whether or not the DCI received from the eNB has a DCI format 1A with a cyclic-redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI), a system information radio network temporary identifier (SI-RNTI), or a random access radio network temporary identifier (RA-RNTI);
if so, discard the DCI based on the row, referenced in the DCI, being greater than 26; and
if not, utilize the DCI to determine a TBS based on the TBS table.
2. The one or more non-transitory, computer-readable media of claim 1 , wherein the instructions, when executed, cause the UE to determine the TBS based on a TBS index by reference to a stored TBS table.
3. The one or more non-transitory, computer-readable media of claim 2 , wherein the instructions, when executed, cause the UE to:
set a column indicator equal to 2 if a least significant bit (LSB) of a transmit power control (TPC) command is 0 and set the column indicator equal to 3 if the LSB of the TPC command is not equal to zero; and
determine the TBS based further on the column indicator.
4. The one or more non-transitory computer-readable media of claim 1 , wherein the instructions, when executed, cause the UE to:
determine a modulation and coding scheme (MCS) index based on the DCI; and
set a TBS index equal to the MCS index.
5. A user equipment (UE) that is configured to process a 256-quadrature amplitude modulation (QAM) transmission, comprising:
a radio frequency (RF) front end to facilitate wireless communication with an evolved node B (eNB); and
communication circuitry coupled with the RF front end to:
receive downlink control information (DCI) from an eNB via the RF front end, wherein the DCI references a row of a transport block size (TBS) table, the row being greater than 26 and associated to 256-QAM;
determine whether or not the DCI received from the eNB has a DCI format 1A with a cyclic-redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI), a system information radio network temporary identifier (SI-RNTI), or a random access radio network temporary identifier (RA-RNTI);
if so, discard the DCI based on the row, referenced in the DCI, being greater than 26; and if not, utilize the DCI to determine a TBS based on the TBS table.
6. The UE of claim 5 , wherein the communication circuitry is further to:
process a physical downlink shared channel (PDSCH) transmission based on the TBS.
7. The UE of claim 5 , wherein the communication circuitry is further to:
determine a modulation and coding scheme (MCS) index based on the DCI; and
set a TBS index equal to the MCS index.
8. The UE of claim 5 , wherein the communication circuitry is to determine the TBS based on the TBS index by reference to a stored TBS table.
9. The UE of claim 8 , wherein the communication circuitry is further to:
set a column indicator equal to 2 if a least significant bit (LSB) of a transmit power control (TPC) command is 0 and set the column indicator equal to 3 if the LSB of the TPC command is not equal to zero; and
determine a column of the TBS table based on the column indicator.
10. A method to be performed by a user equipment (UE) that is configured to process a 256-quadrature amplitude modulation (QAM) transmission, wherein the method comprises:
receiving downlink control information (DCI) from an evolved Node B (eNB), wherein the DCI references a row of a transport block size (TBS) table, the row being greater than 26 and associated to 256-QAM;
determining whether or not the DCI received from the eNB has DCI format 1A with a cyclic-redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI), a system information radio network temporary identifier (SI-RNTI), or a random access radio network temporary identifier (RA-RNTI);
if so, discarding the DCI based on the row, referenced in the DCI, being greater than 26; and
if not, utilizing the DCI to determine a TBS based on the TBS table.
11. The method of claim 10 , further comprising:
determining a modulation and coding scheme (MCS) index based on the DCI; and
setting a TBS index equal to the MCS index.
12. The method of claim 10 , wherein determining the TBS based on the TBS table includes determining the TBS based on a TBS index by reference to a stored TBS table.
13. The method of claim 12 , further comprising:
setting a column indicator equal to 2 if a least significant bit (LSB) of a transmit power control (TPC) command is 0 and setting the column indicator equal to 3 if the LSB of the TPC command is not equal to zero; and
determining the TBS based further on the column indicator.