H-ARQ Acknowledgement Handling During Measurement Gaps
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Solution Overview
Problem
In wireless communication systems, measurement gaps conflict with H-ARQ timing, leading to ineffective H-ARQ operations, and existing solutions, such as dual transceivers, are costly and impractical due to interference issues.
Innovation Solution
A method where the UE engages in a priority activity during scheduled acknowledgement times, receiving a second dynamic resource allocation to determine acknowledgements or negative acknowledgements, allowing H-ARQ to function within measurement gaps without significant delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs measurement gap activities during scheduled H-ARQ acknowledgement times, then measurement accuracy and handover preparation are improved, but H-ARQ timing relationships are broken and communication efficiency deteriorates
Solution Approach 1:
The UE determines in advance whether a measurement gap overlaps with an H-ARQ acknowledgement time. When overlap is detected, the UE proactively decides to perform the measurement gap activity and subsequently determines the acknowledgement from alternative indicators (such as uplink resource allocations) rather than waiting for the scheduled acknowledgement transmission, thus preserving measurement accuracy while maintaining H-ARQ functionality
Solution Approach 2:
Instead of waiting for the traditional H-ARQ acknowledgement on the downlink channel, the patent inverts the approach by determining the acknowledgement status from uplink resource allocation indicators. The UE interprets the presence or absence of uplink grants as implicit acknowledgement signals, thereby resolving the timing conflict without requiring dual transceivers
2Reliability
If dual transceivers are deployed to enable simultaneous H-ARQ and measurement activities, then communication continuity is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the single UE transceiver universal by enabling it to perform both measurement gap activities and H-ARQ acknowledgement reception through intelligent timing management and alternative acknowledgement determination methods. The UE can dynamically switch between functions based on scheduling information, eliminating the need for dedicated separate transceivers while maintaining communication continuity
Solution Approach 2:
The UE serves itself by autonomously determining H-ARQ acknowledgement status from alternative indicators (uplink resource allocations) when measurement gaps overlap with scheduled acknowledgement times. This self-service mechanism allows the UE to maintain H-ARQ functionality without requiring additional hardware resources or complex dual transceiver architectures
Data Source
AI summary
A user equipment (UE) receives a first dynamic resource allocation on a first channel (PDCCH), then sends data according to the first resource allocation. During a time at which an ACK/NACK for the sent data is scheduled to occur on a second channel (PHICH), the UE is engaging in an activity that takes priority over the ACK/NACK. The UE then receives a second dynamic resource allocation on the first channel and determines the ACK/NACK for the sent data from the second dynamic resource allocation. The determining can be direct, as in receiving a zero-valued resource allocation; or it may be indirect as in mapping the second dynamic resource allocation to the second channel and receiving the acknowledgement on the second channel after that mapping. Also detailed are similar mirror actions from the Node B's perspective, as well as apparatus, methods, and embodied computer programs.