Method for PHICH resource allocation
AssigneeNEC Corporation
InventorsPhong Nguyen, Yuanrong Lan
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Abstract
A method is disclosed for PHICH resource allocation in a wireless communication system that supports flexible TDD UL-DL configuration and in which different TDD UL-DL configurations are available and the TDD UL-DL configuration used by first UEs which operate according to the flexible TDD configuration can be different to the TDD UL-DL configuration used by second UEs which operate according to a long term TDD UL-DL configuration. The method comprising allocating a PHICH resource for both first UEs and second UEs according to LTE timing rules applicable to the TDD UL-DL configuration in use by second UEs.
Claims8
A method for Physical H-ARQ Indicator Channel (PHICH) resource allocation in a wireless communication system that supports a flexible TDD UL-DL (Time Division Duplex Uplink-Downlink) configuration and in which different TDD UL-DL configurations are available and the TDD UL-DL configuration used by first UEs (User Equipments) which operate according to the flexible TDD configuration can be different to the TDD UL-DL configuration used by second UEs which operate according to a long term TDD UL-DL configuration, the method comprising:
- allocating a PHICH resource for both first UEs and second UEs according to LTE timing rules applicable to the TDD UL-DL configuration in use by second UEs;
- determining that a PHICH resource is assigned for second UEs with factor mi=1;
- determining that HARQ-ACK for two UL subframes should be fed back;
- and
- allocating the assigned PHICH resource with IPHICH=1for first UEs to accommodate PUSCH HARQ feedback for the second subframe.
A method implemented in a base station used in a wireless communications system, the method comprising:
- transmitting a first uplink (UL)/downlink (DL) configuration to configure a first user equipment (UE) with the first uplink (UL)/downlink (DL) configuration;
- transmitting a second uplink (UL)/downlink (DL) configuration to configure a second user equipment (UE) with the second uplink (UL)/downlink (DL) configuration;
- allocating a first physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) resource for the first UE according to the same timing rule based on a time division duplex (TDD) uplink (UL)/down link (DL) configuration and a subframe number as for a second PHICH resource for the second UE;
- determining that the PHICH resource is assigned for the second UE with factor mi=1;
- determining that HARQ-ACK for two UL subframes should be fed back;
- allocating the assigned PHICH resource with IPHICH=1 for the first UE to accommodate PUSCH HARQ feedback for the second subframe,
- wherein the first uplink (UL)/downlink (DL) configuration can be different from the second uplink (UL)/downlink (DL) configuration.
Dependencies are inferred from the claim text.