PUCCH resource compression for EPDCCH in TDD mode
First Claim
Patent Images
1. A user equipment (UE) comprising:
- processing and receiver circuitry to receive downlink control information (DCI) on an enhanced physical downlink control channel (EPDCCH) that includes indexed enhanced control channel elements (ECCEs), the DCI to schedule a physical downlink shared channel (PDSCH) resource for a downlink subframe;
receive an acknowledgment resource offset (ARO) value in an ARO field of the DCI that instructs the UE to shift a PUCCH resource index by an amount equal to a value of the ARO; and
determine a physical uplink control channel (PUCCH) resource index to acknowledge PDSCH transmissions as a function of a lowest ECCE index used to construct the EPDCCH;
wherein the value of the ARO field corresponds to an ARO value to shift the PUCCH resource index to a range used for acknowledging PDSCH transmissions in an earliest subframe of a bundling window,wherein, for a downlink subframe having a relative index m between 0 and M−
1 with M being a number of subframes in the bundling window and with m=0 representing the earliest subframe, the PUCCH resource index nPUCCH(1) is used to determine the resource block pair, and cyclic shift, andwherein a format 1 PUCCH is computed as;
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Abstract
Techniques are described for compressing the PUCCH resources reserved for acknowledging downlink data transmissions when those resources are implicitly signaled by EPDCCHs that schedule the downlink transmissions in TDD mode. An acknowledgement resource offset field transmitted in the EPDCCH is configured to correspond to one or more values that compress the region in PUCCH resource index space that would otherwise be reserved for the subframes of a bundling window.
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Citations
10 Claims
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1. A user equipment (UE) comprising:
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processing and receiver circuitry to receive downlink control information (DCI) on an enhanced physical downlink control channel (EPDCCH) that includes indexed enhanced control channel elements (ECCEs), the DCI to schedule a physical downlink shared channel (PDSCH) resource for a downlink subframe; receive an acknowledgment resource offset (ARO) value in an ARO field of the DCI that instructs the UE to shift a PUCCH resource index by an amount equal to a value of the ARO; and determine a physical uplink control channel (PUCCH) resource index to acknowledge PDSCH transmissions as a function of a lowest ECCE index used to construct the EPDCCH; wherein the value of the ARO field corresponds to an ARO value to shift the PUCCH resource index to a range used for acknowledging PDSCH transmissions in an earliest subframe of a bundling window, wherein, for a downlink subframe having a relative index m between 0 and M−
1 with M being a number of subframes in the bundling window and with m=0 representing the earliest subframe, the PUCCH resource index nPUCCH(1) is used to determine the resource block pair, and cyclic shift, andwherein a format 1 PUCCH is computed as; - View Dependent Claims (2, 3, 4, 5)
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6. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of user equipment (UE), the one or more processors to configure the UE to:
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receive downlink control information (DCI) on an enhanced physical downlink control channel (EPDCCH) that includes indexed enhanced control channel elements (ECCEs), the DCI to schedule a physical downlink shared channel (PDSCH) resource for a downlink subframe; receive an acknowledgment resource offset (ARO) value in an ARO field of the DCI that instructs the UE to shift a PUCCH resource index by an amount equal to a value of the ARO; and determine a physical uplink control channel (PUCCH) resource index to acknowledge PDSCH transmissions as a function of a lowest ECCE index used to construct the EPDCCH; wherein the value of the ARO field corresponds to an ARO value to shift the PUCCH resource index to a range used for acknowledging PDSCH transmissions in an earliest subframe of a bundling window, wherein, for a downlink subframe having a relative index m between 0 and M−
1 with M being a number of subframes in the bundling window and with m=0 representing the earliest subframe, the PUCCH resource index nPUCCH(1) is used to determine the resource block pair and cyclic shift, andwherein a format 1 PUCCH and is computed as; - View Dependent Claims (7, 8, 9, 10)
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Specification