TDD and FDD joint carrier aggregation enhancements in LTE-advanced
In some implementations, a method in a user equipment (UE) for supporting time division duplex (TDD) and frequency division duplex (FDD) joint carrier aggregation (CA) includes receiving a Physical Uplink Control Channel (PUCCH) resource allocation from an evolved NodeB (eNB). The PUCCH resource allocation includes a first PUCCH configuration for a first subframe and a second PUCCH configuration for a second subframe, and the second PUCCH configuration is different than the first PUCCH configuration. The UE transmits a first group of Hybrid Automatic Repeat reQuest (HARQ) bits based on the first PUCCH configuration in the first subframe. The UE transmits a second group of HARQ bits based on the second PUCCH configuration in the second subframe.
1. A method, comprising:
receiving a PUCCH resource allocation from an evolved NodeB (eNB) for a radio frame that includes a first subframe and a second subframe, wherein the PUCCH resource allocation includes a first PUCCH configuration for transmitting Hybrid Automatic Repeat reQuest (HARQ) bits on a TDD carrier in the first subframe and a second PUCCH configuration for transmitting HARQ bits on the TDD carrier in the second subframe, and the second PUCCH configuration is different than the first PUCCH configuration, wherein the first PUCCH configuration indicates a first PUCCH format and the second PUCCH configuration indicates a second PUCCH format;
transmitting a first group of HARQ bits based on the first PUCCH configuration in the first subframe; and
transmitting a second group of HARQ bits based on the second PUCCH configuration in the second subframe.
2. A method of claim 1 , wherein the PUCCH resource allocation is transmitted in a Radio Resource Control (RRC) message.
3. A method of claim 1 , wherein the first group of HARQ bits includes one or more HARQ bits corresponding to PDSCH transmissions on the TDD carrier and one or more HARQ bits corresponding to PDSCH transmissions on a FDD carrier.
4. A method of claim 1 , wherein the PUCCH resource allocation is a bitmap.
5. A method of claim 1 , wherein the first PUCCH format is PUCCH format 3.
6. A method of claim 5 , wherein the first group of HARQ bits are transmitted in a resource block that is between resource blocks used to transmit PUCCH format 1 and resource blocks used to transmit PUSCH.
7. A method of claim 5 , further comprising:
receiving a resource block allocation, wherein the resource block allocation includes a first parameter and a second parameter that is different than the first parameter; and
wherein the transmission of the first group of HARQ bits is based on the first parameter and the transmission of the second HARQ bit is based on the second parameter.
8. A method of claim 1 , further comprising:
identifying a plurality of subgroups of HARQ bits in the first group of HARQ bits;
identifying a plurality of PUCCH resources for the plurality of subgroups of HARQ bits; and
wherein the transmission of the first group of HARQ bits is based on the plurality of PUCCH resources.
9. A method of claim 8 , wherein the plurality of PUCCH resources are consecutive.
10. A user equipment (UE), comprising:
one or more processors configured to:
receive a PUCCH resource allocation from an eNB, wherein the PUCCH resource allocation includes a first PUCCH configuration for transmitting Hybrid Automatic Repeat reQuest (HARQ) bits on a TDD carrier in the first subframe and a second PUCCH configuration for transmitting HARQ bits on the TDD carrier in the second subframe, and the second PUCCH configuration is different than the first PUCCH configuration, wherein the first PUCCH configuration indicates a first PUCCH format and the second PUCCH configuration indicates a second PUCCH format;
transmit a first group of HARQ bits based on the first PUCCH configuration in the first subframe; and
transmit a second group of HARQ bits based on the second PUCCH configuration in the second subframe.
11. An apparatus comprising instructions embodied on a tangible, non-transitory computer-readable medium, the instructions operable when executed to cause a computing system to perform operations comprising:
receiving a PUCCH resource allocation from an eNB, wherein the PUCCH resource allocation includes a first PUCCH configuration for transmitting Hybrid Automatic Repeat reQuest (HARQ) bits on a TDD carrier in a first subframe in a radio frame and a second PUCCH configuration for transmitting HARQ bits on the TDD carrier in a second subframe in the radio frame, and the second PUCCH configuration is different than the first PUCCH configuration, wherein the first PUCCH configuration indicates a first PUCCH format and the second PUCCH configuration indicates a second PUCCH format;
transmitting a first group of HARQ bits based on the first PUCCH configuration in the first subframe; and
transmitting a second group of HARQ bits based on the second PUCCH configuration in the second subframe.