LTE-TDD carrier aggregation enhancement for half-duplex UES

A method of wireless communication, comprising:

• receiving a broadcast message indicating a first subframe configuration of a primary cell and a second subframe configuration for one or more secondary cells in a same band as the primary cell;
• in response to a number of secondary cell downlink subframes of the one or more secondary cells being greater than or equal to a number of primary cell downlink subframes of the primary cell:
• determining a downlink error-control messaging timing for the primary cell and the one or more secondary cells based on the second subframe configuration;
• and
• determining an uplink error-control messaging timing for the primary cell and the one or more secondary cells based on the first subframe configuration;
• in response to a number of secondary cell uplink subframes of the one or more secondary cells being greater than or equal to a number of primary cell uplink subframes of the primary cell:
• determining the downlink error-control messaging timing for the primary cell and the one or more secondary cells based on the first subframe configuration;
• and
• determining the uplink error-control messaging timing for the primary cell and the one or more secondary cells based on the second subframe configuration;
• and
• conducting error-control messaging according to the downlink error-control messaging timing and the uplink error-control messaging timing.

A non-transitory computer-readable medium having program code recorded thereon, comprising:

• program code for causing a computer to monitor for characteristics of a control signal related to subframe configuration for each time division duplex (TDD) cell of an aggregated set of TDD cells in a same band, wherein at least one TDD cell of the aggregated set of TDD cells in the same band has a different uplink-downlink configuration than at least one other TDD cell of the aggregated set of TDD cells in the same band;
• program code for causing the computer to determine, in response to detecting the characteristics of the control signal, one or more downlink subframes of the aggregated set of TDD cells in the same band based on the characteristics of the control signal, wherein the program code for causing the computer to determine the one or more downlink subframes includes program code for causing the computer to determine that one or more subframes of one or more secondary TDD cells of the aggregated set of TDD cells in the same band, corresponding to one or more subframes of a primary TDD cell of the aggregated set of TDD cells that are configured as uplink subframes, comprise downlink subframes, based on a lack of reception of one or more uplink grants for the one or more subframes of the one or more secondary TDD cells from the primary TDD cell of the aggregated set of TDD cells in the same band, wherein the one or more uplink grants from the primary TDD cell are user equipment (UE)-specific grants;
• and
• program code for causing the computer to receive downlink transmissions from one or more TDD cells of the aggregated set of TDD cells in the same band during the determined one or more downlink subframes.

An apparatus configured for wireless communication, the apparatus comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor,
• wherein the at least one processor is configured:
• to monitor for characteristics of a control signal related to subframe configuration for each time division duplex (TDD) cell of an aggregated set of TDD cells in a same band, wherein at least one TDD cell of the aggregated set of TDD cells in the same band has a different uplink-downlink configuration than at least one other TDD cell of the aggregated set of TDD cells in the same band;
• to determine, in response to detecting the characteristics of the control signal, one or more downlink subframes of the aggregated set of TDD cells in the same band based on the characteristics of the control signal, wherein the configuration of the at least one processor to determine the one or more downlink subframes includes configuration of the at least one processor to determine that one or more subframes of one or more secondary TDD cells of the aggregated set of TDD cells in the same band, corresponding to one or more subframes of a primary TDD cell of the aggregated set of TDD cells that are configured as uplink subframes, comprise downlink subframes, based on a lack of reception of one or more uplink grants for the one or more subframes of the one or more secondary TDD cells from the primary TDD cell of the aggregated set of TDD cells in the same band, wherein the one or more uplink grants from the primary TDD cell are user equipment (UE)-specific grants;
• and
• to receive downlink transmissions from one or more TDD cells of the aggregated set of TDD cells in the same band during the determined one or more downlink subframes.