Techniques for using a modulation and coding scheme for downlink transmissions

At least one non-transitory machine readable medium comprising a plurality of instructions that in response to being executed on a system for an evolved Node B (eNB) causes the system to:

• generate a physical multicast channel-InfoList (PMCH-InfoList) information element (IE) that includes a field to indicate 256 quadrature amplitude modulation (256QAM) for downlink transmissions to one or more user equipment (UEs) over a physical multicast channel (PMCH);
• select a value for a dataMCS field of the PMCH-InfoList IE that indicates a modulation coding scheme (MCS) index value for a modulation and transport block size (TBS) index table for physical downlink shared channel (PDSCH), the MCS index value to indicate a first MCS for downlink transmissions received from the eNB that has a TBS index of at least 25;
• and
• cause the PMCH-InfoList IE to be transmitted to the one or more UEs.

An apparatus comprising:

• a radio interface for user equipment (UE);
• and
• baseband circuitry for the UE, the baseband circuitry to execute logic, at least a portion of which is in hardware, the logic to:
• receive a physical multicast channel-InfoList (PMCH-InfoList) information element (IE) from one or more evolved Node B (eNBs) that includes a field indicating 256 quadrature amplitude modulation (256QAM) for downlink transmissions from the one or more eNBs over a physical multicast channel (PMCH);
• select a modulation and transport block size (TBS) index table for physical downlink shared channel (PDSCH) to determine a first modulation coding scheme (MCS) to receive downlink transmissions over the PMCH based on the field indicating 256QAM for downlink transmissions from the one or more eNBs over the PMCH;
• determine the first MCS for receiving downlink transmissions over the PMCH based on a value for a dataMCS field of the PMCH-InfoList IE that indicates an MCS index value for the selected modulation and TBS index table for PDSCH, the MCS index value to indicate a TBS index of at least 25;
• and
• cause the radio interface to use the first MCS to receive downlink transmissions over the PMCH from the one or more eNBs.

At least one non-transitory machine readable medium comprising a plurality of instructions that in response to being executed on a system for user equipment (UE) causes the system to:

• receive a physical multicast channel-InfoList (PMCH-InfoList) information element (IE) from one or more evolved Node B (eNBs) that includes a field indicating 256 quadrature amplitude modulation (256QAM) for downlink transmissions from the one or more eNBs over a physical multicast channel (PMCH);
• select a modulation and transport block size (TBS) index table for physical downlink shared channel (PDSCH) to use to determine a first modulation coding scheme (MCS) to receive downlink transmissions over the PMCH based on the field indicating 256QAM for downlink transmissions from the one or more eNBs over the PMCH;
• determine the first MCS to receive downlink transmissions over the PMCH based on a value for a dataMCS field of the PMCH-InfoList IE that indicates an MCS index value for the selected modulation and TBS index table for PDSCH, the MCS index value to indicate a modulation order of 8;
• and
• cause a radio interface for the UE to use the first MCS to receive downlink transmission over the PMCH from the one or more eNBs.