Method and apparatus for improvement of TDD inter-band carrier aggregation in a wireless communication system
First Claim
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1. A method of Time Division Duplex (TDD) inter-band carrier aggregation in a wireless communication system comprising:
- aggregating, at a UE (User Equipment), multiple cells with different Time Division Duplex (TDD) uplink (UL)-downlink (DL) configurations;
transmitting, by the UE, an uplink Physical Uplink Share Channel (PUSCH) transmission on a first cell, wherein the UE expects to receive a downlink subframe on the first cell for receiving a Hybrid Automatic Repeat and reQuest (HARQ) feedback for the uplink PUSCH transmission on the first cell, wherein the UE decides whether to perform retransmission for the uplink PUSCH transmission based on the HARQ feedback, and wherein the HARQ feedback is set to Acknowledgement (ACK) if a base station successfully decodes the uplink PUSCH transmission;
setting, by the UE, as the UE fails to receive the HARQ feedback due to a UL subframe in a second cell, the HARQ feedback parameter to ACK for the uplink PUSCH transmission without receiving the HARQ feedback so as to suspend retransmission for the PUSCH if the downlink subframe on the first cell for receiving the HARQ feedback collides with the UL subframe in the second cell; and
suspending, at the UE, a following retransmission of the PUSCH.
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Abstract
A method and apparatus for TDD inter-band carrier aggregation in a wireless communication system includes performing aggregating multiple cells with different TDD UL-DL configurations, transmitting a PUSCH transmission on a first cell, the subframe for HARQ feedback reception for the PUSCH in a first cell colliding with a UL subframe in a second cell, and performing one of setting the corresponding HARQ feedback to ACK, flushing the corresponding HARQ buffer, and changing the corresponding HARQ feedback subframe for the PUSCH to another subframe.
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Citations
16 Claims
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1. A method of Time Division Duplex (TDD) inter-band carrier aggregation in a wireless communication system comprising:
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aggregating, at a UE (User Equipment), multiple cells with different Time Division Duplex (TDD) uplink (UL)-downlink (DL) configurations; transmitting, by the UE, an uplink Physical Uplink Share Channel (PUSCH) transmission on a first cell, wherein the UE expects to receive a downlink subframe on the first cell for receiving a Hybrid Automatic Repeat and reQuest (HARQ) feedback for the uplink PUSCH transmission on the first cell, wherein the UE decides whether to perform retransmission for the uplink PUSCH transmission based on the HARQ feedback, and wherein the HARQ feedback is set to Acknowledgement (ACK) if a base station successfully decodes the uplink PUSCH transmission; setting, by the UE, as the UE fails to receive the HARQ feedback due to a UL subframe in a second cell, the HARQ feedback parameter to ACK for the uplink PUSCH transmission without receiving the HARQ feedback so as to suspend retransmission for the PUSCH if the downlink subframe on the first cell for receiving the HARQ feedback collides with the UL subframe in the second cell; and suspending, at the UE, a following retransmission of the PUSCH. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communication device for use in a wireless communication system, the communication device comprising:
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a control circuit; a processor installed in the control circuit to control the control circuit; a memory installed in the control circuit and coupled to the processor; wherein the processor is configured to execute a program code stored in the memory to; aggregate multiple cells with different Time Division Duplex (TDD) uplink (UL)-downlink (DL) configurations; transmit, by the UE, an uplink Physical Uplink Share Channel (PUSCH) transmission on a first cell, wherein the UE expects to receive a downlink subframe on the first cell for receiving a Hybrid Automatic Repeat and reQuest (HARQ) feedback for the uplink PUSCH transmission on the first cell, wherein the UE decides whether to perform retransmission for the uplink PUSCH transmission based on the HARQ feedback, and wherein the HARQ feedback is set to Acknowledgement (ACK) if a base station successfully decodes the uplink PUSCH transmission; set, by the UE, as the UE fails to receive the HARQ feedback due to a UL subframe in a second cell, the HARQ feedback parameter to ACK for the uplink PUSCH transmission without receiving the HARQ feedback so as to suspend retransmission for the PUSCH if the downlink subframe on the first cell for receiving the HARQ feedback collides with the UL subframe in the second cell; and suspend a following retransmission of the PUSCH. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification