Sidelink Feedback Preemption via SPI in Wireless Networks
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink feedback preemption and uplink multiplexing, leading to potential interference and reduced network efficiency.
Innovation Solution
The proposed solution involves identifying sidelink feedback resources and determining whether to transmit or preempt sidelink feedback based on a sidelink preemption indication (SPI) from a base station, considering factors such as priority, RSRP measurements, and resource pool IDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink feedback resources are allocated for providing HARQ feedback, then feedback transmission reliability is improved, but resource collision and interference increase when preemption occurs
Solution Approach 1:
The base station sends a sidelink preemption indication (SPI) before the actual feedback transmission to notify UEs of upcoming preemption. This allows receiving UEs to cancel their feedback transmissions in advance, avoiding resource collisions and interference while maintaining reliable feedback delivery for non-preempted transmissions
Solution Approach 2:
Instead of allowing feedback transmission and then resolving conflicts, the system inverts the approach by first indicating preemption and then canceling feedback transmissions. The SPI mechanism inverts the traditional feedback flow by giving the base station control to preempt feedback resources before they are used
2Loss of time
If sidelink feedback is transmitted using PSFCH resources, then feedback latency is reduced, but resource allocation complexity increases
Solution Approach 1:
The system uses self-service by allowing receiving UEs to autonomously determine whether to transmit or cancel feedback based on the received SPI. Each UE independently evaluates the preemption indication against its own feedback transmission plans and makes cancellation decisions without requiring complex centralized coordination, reducing overall system complexity while maintaining low latency
3Productivity
If multiple UEs transmit sidelink feedback simultaneously, then network throughput is improved, but interference and collision probability increase
Solution Approach 1:
The system implements feedback through the SPI mechanism where the base station monitors sidelink communication needs and provides preemption indications to UEs. This feedback loop allows the base station to control feedback transmission timing, enabling multiple UEs to transmit without collision by receiving appropriate preemption or non-preemption indications, thus maintaining high throughput while avoiding interference
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which multiple devices may implement sidelink communications for direct device-to-device exchange of information. Such devices (e.g., user equipment (UE) devices) may be configured with resources for sidelink communications, and may monitor for a sidelink preemption indication (SPI) from a base station and determine whether one or more sidelink communications is preempted based on the SPI. The sidelink communications may include a feedback communication that is transmitted using sidelink feedback resources. Based on an indication in a received SPI, it may be determined whether or not to transmit sidelink feedback. The sidelink feedback may be transmitted to one or more other sidelink devices, or to a base station, and preemption of the sidelink feedback may be determined based on one or more parameters associated with the sidelink communications, associated with the SPI, or any combinations thereof.