HARQ Feedback Occasion Grouping for XR Jitter Mitigation
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Solution Overview
Problem
The over-provisioning of transmission occasions in hybrid automatic repeat request (HARQ) feedback transmission leads to increased complexity in terminal devices for blind detection and higher signaling overhead, particularly due to jitter effects in extended reality (XR) services.
Innovation Solution
The proposed solution involves configuring a first number of occasions within a period for HARQ feedback transmission, but only transmitting a second number of information blocks for feedback, where the second number is less than the first number, thereby reducing unnecessary signaling and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If over-provisioning of transmission occasions is used to alleviate jitter effects, then service reliability for XR applications is improved, but terminal device complexity for blind detection increases
Solution Approach 1:
The patent segments the transmission occasions into multiple groups within a period, where each group contains a subset of the total occasions. The terminal device only needs to perform blind detection on the occasions within its assigned group rather than all configured occasions, thereby reducing detection complexity while maintaining coverage for jitter mitigation
Solution Approach 2:
The patent introduces dynamic grouping where different terminal devices can be assigned different groups of occasions dynamically. This allows the system to adaptively distribute the blind detection burden across multiple terminal devices, reducing individual device complexity while collectively covering all transmission occasions for reliable jitter handling
2Reliability
If over-provisioning of transmission occasions is used to alleviate jitter effects, then service reliability for XR applications is improved, but signaling overhead for HARQ feedback increases
Solution Approach 1:
The patent segments HARQ feedback reporting into multiple groups corresponding to different occasion groups. Each terminal device reports feedback only for its assigned group, reducing the total feedback signaling overhead while collectively providing coverage for all transmission occasions, thus maintaining service reliability
Solution Approach 2:
The patent implements dynamic feedback reporting where terminal devices are assigned different groups for feedback reporting in different time instances. This dynamic distribution reduces the simultaneous feedback signaling load while ensuring that feedback for all occasions is collected over time, maintaining reliability without excessive overhead
3Reliability
If multiple occasions are configured within a period for SPS transmission, then jitter effect mitigation is improved, but HARQ feedback complexity increases
Solution Approach 1:
The patent segments the set of configured occasions within a period into multiple disjoint groups. Each terminal device is assigned one or more specific groups, and only generates HARQ feedback for occasions in its assigned groups. This segmentation reduces the feedback generation complexity for each device while collectively covering all occasions for effective jitter mitigation
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A first device receives, from a second device, at least one data transmission on at least one occasion in a first number of occasions, the first number of occasions being configured within a period. The first device transmits, to the second device, a second number of information blocks for a HARQ feedback for the at least one data transmission, the second number being less than the first number. In this way, an effect of jitter is alleviated, complexity of a terminal device for blind detection is reduced, and signaling overhead on HARQ feedback is saved.