Sidelink Feedback Collection via Uplink Resources
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Solution Overview
Problem
Wireless communication systems face challenges in collecting reliable sidelink channel feedback due to communication blockages between user equipment (UEs), particularly when operating in unlicensed bands, leading to failed listen-before-talk attempts and inability to transmit feedback information to the base station.
Innovation Solution
A method where a receiving UE directly transmits sidelink feedback information to the base station using indicated uplink resources, which includes receiving indications of sidelink and uplink resources, monitoring for sidelink shared channel transmissions, and generating feedback information based on these indications to ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a receiving UE transmits feedback information to a transmitting UE via sidelink, then the feedback can be collected at the transmitting UE, but the base station cannot directly obtain feedback and relay requests for retransmission
Solution Approach 1:
The transmitting UE acts as an intermediary by receiving feedback information from the receiving UE via sidelink and then forwarding this information to the base station via uplink. This mediator approach ensures that the base station obtains feedback information even when direct UE-to-base station feedback paths are unavailable, resolving the contradiction between sidelink feedback collection and base station information access.
2Reliability
If the transmitting UE successfully receives feedback from the receiving UE, then the transmitting UE can forward it to the base station, but if communication is blocked (e.g., in unlicensed bands), the feedback cannot be transmitted
Solution Approach 1:
Instead of requiring the receiving UE to send feedback directly to the base station (which may be blocked), the system inverts the path by having the receiving UE send feedback to the transmitting UE via sidelink, and then the transmitting UE forwards it to the base station via uplink. This inverted approach bypasses direct blocked paths and utilizes available communication channels.
3Productivity
If the base station schedules sidelink resources for UE communication, then efficient resource utilization is achieved, but the base station lacks direct feedback information from receiving UEs
Solution Approach 1:
The system implements a feedback mechanism where the transmitting UE receives feedback information from the receiving UE via sidelink and forwards it to the base station via uplink. This feedback loop enables the base station to obtain necessary information for scheduling decisions, resolving resource allocation efficiency while maintaining information availability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The method may involve a first user equipment (UE) receiving an indication of a set of sidelink resources and an indication of a set of uplink resources for transmitting sidelink feedback information. The first UE may receive a sidelink shared channel transmission from a second UE and upon receiving the sidelink shared transmission, generate feedback information regarding the sidelink shared channel transmission and transmit the feedback information directly to the base station using the set of uplink resources.