Sidelink HARQ Feedback for UE Cooperation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current UE cooperation solutions in wireless communication systems do not efficiently exploit sidelink communication capabilities for HARQ mechanisms, leading to increased complexity and resource inefficiency, particularly in scenarios like V2X communications where latency and resource conflicts are prevalent.
Innovation Solution
Implementing UE cooperation schemes that utilize sidelink HARQ feedback to enable CUEs to cooperate by retransmitting selected code block groups or outer-coded data, allowing for distributed cooperation without base station scheduling, even if a CUE does not fully decode the data block, thereby reducing resource usage and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE cooperation with sidelink communications is implemented for HARQ feedback, then reliability and throughput are enhanced, but network communication complexity increases
Solution Approach 1:
The patent segments the HARQ feedback mechanism into multiple components: initial transmission from base station, sidelink feedback from target UE to cooperating UE, and selective retransmission. This segmentation allows distributed HARQ operations while managing complexity through modular feedback handling.
Solution Approach 2:
The patent implements partial action by allowing cooperating UEs to participate in HARQ feedback only when they have successfully decoded the transport block. Not all UEs are required to participate in sidelink HARQ, reducing overall system complexity while maintaining reliability benefits where applicable.
2Productivity
If joint UE reception using sidelink communications is implemented, then system throughput and coverage are increased, but HARQ signaling complexity increases
Solution Approach 1:
The patent extracts the HARQ feedback function from centralized base station control and distributes it to target UEs and cooperating UEs via sidelink communications. This extraction enables throughput enhancement through diverse reception paths while managing signaling complexity through standardized feedback formats.
Solution Approach 2:
The patent implements feedback mechanisms where target UEs send HARQ acknowledgments to cooperating UEs via sidelink, enabling selective retransmission. This feedback loop improves throughput by allowing cooperative UEs to assist only when beneficial, while the standardized feedback protocol manages signaling complexity.
3Loss of energy
If sidelink HARQ feedback is implemented for UE cooperation, then resource usage is reduced, but implementation complexity increases
Solution Approach 1:
The patent implements preliminary action by establishing sidelink HARQ feedback capabilities and resource allocations in advance through base station configuration. This preliminary setup reduces resource usage during actual data transmission while managing implementation complexity through pre-negotiated parameters and reserved resources.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Methods and devices utilizing sidelink transmission between user equipment (UEs) for HARQ retransmission are provided. The sidelinkHARQ retransmissions include data from the initial transmission or an outer coded version thereof. HARQ feedback from the targeted receiver of the initial transmission may identify code block groups and/or individual code blocks the target receiver did not successfully decode. A UE that has not successfully decoded an entire transport block, may still cooperate in HARQ retransmission for the targeted receiver of the transport block by retransmitting at least a subset of the code block groups that it was able to successfully decode for the transport block.