Cross-RAT Sidelink Resource Selection for Co-Channel Coexistence
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Solution Overview
Problem
Sidelink communications between devices operating on different radio access technologies (RATs) often collide due to overlapping frequency resources, negatively impacting system performance.
Innovation Solution
A wireless device operating on a first RAT receives sidelink resource reservations from a second RAT, determines overlapping resources, and excludes them from its candidate resource set, selecting non-overlapping resources for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple RATs use overlapping frequency resources for sidelink communication, then spectral efficiency is improved, but collisions occur and system performance deteriorates
Solution Approach 1:
The patent applies preliminary action by having wireless devices sense and detect resource reservations from other RATs before selecting transmission resources. The device receives sidelink resource reservations from second RAT devices and uses this information in advance to determine which resources to exclude from its candidate resource set, preventing collisions before they occur.
Solution Approach 2:
The patent introduces an intermediary mechanism where the first RAT device acts as a mediator by receiving resource reservation information from second RAT devices and using this information to make informed resource selection decisions. This intermediary process of receiving and processing reservation information enables coordination between different RATs without requiring direct interaction or signaling protocols.
2Device complexity
If wireless devices independently select resources without considering other RAT reservations, then device complexity is reduced, but resource collisions increase
Solution Approach 1:
The patent applies universality by designing a resource selection mechanism that serves multiple functions: the device simultaneously manages its own RAT resource selection and also considers reservations from other RATs. The candidate resource set determination process universally handles both same-RAT and cross-RAT resource conflicts, eliminating the need for separate complex mechanisms for each scenario.
3Reliability
If the first RAT device excludes resources overlapping with second RAT reservations, then collision avoidance is improved, but available transmission resources are reduced
Solution Approach 1:
The patent applies local quality by making selective exclusions rather than blanket exclusions. The device determines whether to exclude overlapping resources based on local conditions such as resource reservation strength, priority levels, and interference measurements. This allows the device to maintain collision avoidance where needed while preserving transmission opportunities where conflicts are unlikely or manageable.
Data Source
AI summary
To facilitate coexistence of a first radio access technology (RAT) and a second RAT, methods, apparatuses, and computer program products are provided. An example method of a first wireless device operating based on a RAT includes receiving a sidelink resource reservation from a second wireless device based on a second RAT, the sidelink resource reservation indicating a first set of resources. The example method further includes determining whether to exclude, from a candidate resource set for the first RAT within a sidelink resource pool for the first RAT, resources that overlap with the set of reserved resources for the second RAT. The example method further includes transmitting a sidelink transmission using one or more sidelink transmission resources selected from the candidate resource set in the sidelink resource pool for the first RAT.