Sidelink Resource Reservation in Shared Bands
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Solution Overview
Problem
Existing wireless communication systems face challenges in reliably reserving sidelink resources in shared bands, particularly due to competition from other radio access technologies (RATs) in unlicensed bands, which leads to inefficiencies and reduced reliability in resource utilization.
Innovation Solution
The proposed solution involves determining a competition level metric by monitoring signal strength and failed Listen Before Talk (LBT) procedures from other RATs, and then adjusting the number of resources reserved in the sidelink resource pool based on this metric. This approach allows UEs to dynamically adapt their resource reservations to minimize competition, thereby enhancing reservation reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs reserve a fixed number of resources per SCI in unlicensed bands, then resource reservation is simple to implement, but reservation reliability deteriorates due to competition from other RATs
Solution Approach 1:
The patent implements dynamic resource reservation by adjusting the number of reserved resources based on detected competition levels from other RATs. The UE monitors the unlicensed band for signals from other RATs and modifies its reservation behavior accordingly, transitioning from static to dynamic resource allocation to maintain reliability under varying competition conditions.
Solution Approach 2:
The patent changes the parameter of resource reservation quantity based on detected competition levels. When high competition from other RATs is detected, the UE reduces the number of reserved resources; when competition is low, it increases reservations. This parameter adjustment resolves the contradiction between reliability and complexity by adapting to environmental conditions.
2Productivity
If UEs reserve more resources per SCI, then resource availability for sidelink communication is improved, but resource waste increases due to competition from other RATs
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors the unlicensed band for competition signals from other RATs and uses this information to adjust its resource reservation strategy. This feedback loop enables the system to optimize resource allocation by increasing reservations when the band is clear and reducing them when competition is detected, thereby improving productivity while minimizing resource waste.
Solution Approach 2:
The patent makes resource reservation dynamic by adjusting the reservation quantity based on real-time detection of competition levels. This dynamic approach allows the system to maximize sidelink communication efficiency when resources are available while avoiding waste when other RATs are actively using the unlicensed band.
3Reliability
If UEs monitor competition from other RATs to adjust resource reservations, then reservation reliability is improved, but measurement and detection complexity increases
Solution Approach 1:
The patent implements self-service monitoring where each UE independently detects competition from other RATs in the unlicensed band and autonomously adjusts its own resource reservations. This self-service approach improves reliability through local adaptation without requiring complex network-coordinated measurement systems, thereby managing detection complexity at the device level.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described to support determining, at one or more sidelink user equipments (UEs), a competition level associated with another radio access technology (RAT) sharing a frequency band with the one or more sidelink UEs. A UE may determine a competition level from another RAT and may reserve resources in a sidelink resource pool based on the based on the determined competition level. For example, the UE may determine a signal strength associated with the other RAT, or may determine a ratio of failed LBT procedures, or both, based on monitoring one or more resources of the sidelink resource pool. Based on the determined competition level, the UE may determine a number of resources to reserve, or a reservation reliability, or both. The UE may transmit a resource reservation indicating the number of reserved resources, the reservation reliability, or both.