ACK/NACK transmission on PUCCH in LTE-ATDD with NxPDCCH structure

Abstract

Systems and methods are provided for enabling different ''bundling'' methods for downlink transmissions and provide different interpretations of the acknowledgement / negative- acknowledgement bit. A user equipment is configured so that it commonly acknowledges all downlink transmission time intervals within a bundle so that if one packet is determined to be erroneous, all packets in that bundle will be retransmitted. Additionally, the systems and methods are implemented by allowing an interpretation to be applied to the uplink acknowledgement / negative-acknowledgement field such that the user equipment is able to divide bundled downlink packets into smaller windows in Long Term Evolution (LTE) Release 8 time division duplex (TDD) mode. In LTE Advanced (LTE-A) TDD mode, various embodiments provide bundling within the time domain, within the frequency domain, and within a hybrid time- frequency domain. Furthermore, enhanced channel selection methods are also provided in support of the above-mentioned bundling methods in accordance with various embodiments.

Description

technical field [0001] Various embodiments relate generally to radio communications. More specifically, various embodiments relate to the bundling concept and enhanced channel selection method standardized in the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Advanced (LTE-A), which also backwards with the bundled ACK / NACK The process is compatible where each ACK / NACK of bundled ACK / NACKs is associated with one downlink packet when the number of downlink resources is greater than the number of uplink resources according to the 3GPP LTE Release 8 standard. Background technique [0002] This section is intended to provide a background or context to the invention that is recited in the claims. The descriptions herein may include concepts that can be explored, but not necessarily those that have been thought of or explored before. Therefore, except as expressly indicated herein, what is mentioned in this section is not prior art to the description and clai...

AI Technical Summary

Problems solved by technology

Signaling this information incurs constant signaling overhead for all allocations

Furthermore, due to Physical Downlink Control Channel (PDCCH) detection errors, a "blind" common understanding between eNB and UE cannot be assumed

[0007] Also, when a large number of ACK / NACKs for downlink packets are bundled in a bundling window (where a bundling window refers to, for example, a downlink TTI / subframe whose ACK / NACKs are to be bundled), PDCCH detection reliability such as may begin to dominate link adaptation error localization

Therefore, a simple AND operation on ACK / NACK bundling becomes impractical, and the eNB has to reduce scheduling flexibility about when, for example, data packets can be transmitted, such as only allowing each downlink scheduling window for one downlink transmission

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