HARQ-ACK Multiplexing for Invalid PUCCH Resource Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling multicast and broadcast transmissions, particularly in managing acknowledgement information for diverse devices with varying data traffic profiles and latency tolerances, leading to issues with resource allocation and HARQ-ACK transmission.
Innovation Solution
The proposed solution involves selecting outstanding portions of acknowledgement information for multiplexing and transmission using a single valid communication resource allocation, applying filter criteria based on layer 1 priority and timing, and dynamically allocating uplink resources to optimize HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple portions of acknowledgement information are transmitted using separate uplink communication resources, then the reliability of HARQ-ACK feedback is improved, but the device complexity and resource allocation overhead increase
Solution Approach 1:
The patent combines multiple portions of acknowledgement information (HARQ-ACKs) corresponding to different downlink transmissions into a single uplink communication resource instance. This merging approach maintains feedback reliability by ensuring all acknowledgements are transmitted together while reducing resource allocation overhead and simplifying device operations by using a single resource instead of multiple separate resources.
2Loss of time
If uplink communication resources are allocated for every downlink transmission instance, then the timeliness of HARQ-ACK feedback is improved, but the loss of communication resources increases
Solution Approach 1:
The patent makes a single uplink communication resource instance capable of carrying multiple portions of acknowledgement information that would otherwise require separate resources. This multi-functional approach reduces uplink resource consumption and energy usage while maintaining timely feedback by ensuring all HARQ-ACKs are transmitted in the same resource instance without requiring additional allocations.
3Loss of energy
If all outstanding portions of acknowledgement information are multiplexed into a single transmission, then resource utilization is improved, but the risk of information loss increases
Solution Approach 1:
The patent employs feedback mechanisms where the infrastructure equipment receives and processes multiple HARQ-ACKs in a single uplink transmission, enabling it to track the reception status of each downlink transmission instance. This feedback capability ensures that even though multiple acknowledgements are multiplexed together, the system can maintain information integrity by correctly identifying and processing each individual HARQ-ACK based on its association with specific downlink resources.
Data Source
AI summary
A method of transmitting acknowledgement information, includes receiving from an infrastructure equipment of a wireless communications network an indication of a plurality of instances of downlink communications resources associated with a semi-persistent resource allocation, the plurality of instances of downlink communications resources allocated for the transmission of data by the infrastructure equipment to the communications device via a wireless access interface, determining that one or more uplink communication resources allocated for the transmission of a portion of acknowledgement information indicating an acknowledgement status of a respective instance of the downlink communication resources is invalid and cannot be used for the transmission of the acknowledgement information, selecting, from a plurality of outstanding portions of acknowledgement information which have not been transmitted, a subset of portions of acknowledgement information, and transmitting to the infrastructure equipment the selected subset of portions of acknowledgement information using a single instance of uplink communication resources.