PUCCH Resource Compression for HARQ-ACK Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving Hybrid Automatic Repeat Request (HARQ) acknowledgment signals, particularly in terms of resource overhead, especially in Time Division Duplex (TDD) systems where multiple Downlink subframes require simultaneous Uplink HARQ-ACK transmissions, leading to resource compression challenges and potential collisions.
Innovation Solution
The method involves a 2-dimensional PUCCH resource compression using a HARQ-ACK Resource Offset (HRO) field in the Downlink Control Information (DCI) format, partitioning it into a first HRO field for ECCE domain compression and a second for time domain compression, allowing for overlapping resources across subframes and PRB sets, thereby reducing resource overhead and avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple Downlink subframes require simultaneous Uplink HARQ-ACK transmissions in TDD systems, then the system can maintain proper HARQ timing for multiple downlink transmissions, but resource overhead increases and resource collisions occur
Solution Approach 1:
The patent applies 2-dimensional resource compression by introducing both ECCE domain compression (first dimension) and time domain compression (second dimension). The first HRO field compresses resources in the ECCE domain while the second HRO field compresses resources in the time domain, allowing multiple downlink subframes to share uplink PUCCH resources without collisions, thus reducing resource overhead while maintaining HARQ timing accuracy
Solution Approach 2:
The HRO field is segmented into two separate fields: the first HRO field for ECCE domain compression and the second HRO field for time domain compression. This segmentation allows independent optimization of resource allocation in different domains, enabling efficient handling of multiple downlink subframes with reduced overall resource overhead
2Quantity of substance
If PUCCH resources are compressed for multiple subframes, then resource overhead is reduced, but resource collisions may occur between different PRB sets and subframes
Solution Approach 1:
By implementing compression in two independent dimensions (ECCE domain and time domain), the patent allows resources to overlap in one dimension while being separated in the other dimension. This 2-dimensional approach enables resource compression without collisions, as collisions in the ECCE domain are prevented by time domain separation and vice versa
Solution Approach 2:
The two HRO fields act as intermediaries that coordinate resource allocation between different domains. The first HRO field mediates ECCE domain resource allocation while the second HRO field mediates time domain resource allocation, ensuring that resource assignments from different PRB sets and subframes do not collide
Data Source
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AI summary
A method and a terminal in a wireless communication system, the method comprising receiving, from a base station, downlink control information (DCI) via a physical downlink control channel (PDCCH) wherein the DCI includes a physical uplink control channel (PUCCH) resource related field; determining a PUCCH resource, based on the PUCCH resource related field, an index of a first control channel element (CCE) for the PDCCH and a number of CCEs for the PDCCH; and transmitting, to the base station, hybrid automatic repeat request-acknowledgement, HARQ-ACK, information via a PUCCH, based on the PUCCH resource.