PUCCH resource compression for EPDCCH in TDD mode

摘要

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.

主权项

1. A method for operating an evolved Node B (eNB) in time division duplex (TDD) mode, comprising:
via an enhanced physical downlink control channel (EPDCCH) made up of indexed enhanced control channel elements (ECCEs), transmitting downlink control information (DCI) to a UE that grants a physical downlink shared channel (PDSCH) resource for a downlink subframe belonging to a bundling window and assigning a physical uplink control channel (PUCCH) resource index to the UE for acknowledging the PDSCH transmission calculated as a function of the lowest index of the ECCEs used to construct the EPDCCH added to the number of ECCEs in EPDCCHs that grant PDSCH resources for earlier subframes that belong to the bundling window; and, transmitting an acknowledgment resource offset (ARO) in an ARO field of the DCI that instructs the UE to shift the PUCCH resource index by an amount equal to the value of the ARO and wherein, for subframe subsequent to the earliest subframe of the bundling window, values for the ARO are selected from a group that includes a value that shifts the PUCCH resource index to a range used for acknowledging PDSCH transmissions in the earliest subframe of the bundling window.