Sidelink Grant Collision Handling for Overlapping NR Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in handling sidelink grant collisions, particularly in 5G and New Radio (NR) networks, where multiple UEs may receive overlapping sidelink grants, leading to interference and inefficient resource utilization.
Innovation Solution
A user equipment (UE) is equipped with a communication manager that handles sidelink grant collisions by processing overlapping sidelink grants and determining appropriate actions to transmit messages using one or both grants, thereby optimizing resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE transmits multiple PUSCHs with different priority levels on the same PRBs, then resource utilization is improved, but grant collision occurs causing transmission failure
Solution Approach 1:
The UE performs preliminary actions by monitoring PDCCH for grant cancellation indications before transmitting PUSCH, and by preparing multiple PUSCH configurations in advance with different priority levels. This allows the UE to proactively adjust transmission plans based on received indications, preventing grant collisions before they occur while maintaining high resource utilization through pre-configured alternative transmissions
2Reliability
If the network cancels grants dynamically to avoid collisions, then transmission reliability is improved, but control signaling overhead increases
Solution Approach 1:
The patent extracts the grant cancellation indication from conventional uplink grant messaging and places it in downlink search space monitoring, separating the collision avoidance function from traditional scheduling procedures. This reduces control signaling overhead by using existing downlink control resources rather than adding dedicated uplink cancellation messages
Solution Approach 2:
The downlink PDCCH monitoring mechanism serves multiple functions: it provides both regular downlink scheduling information and grant cancellation indications simultaneously. This multi-functionality reduces the need for separate control channels, thereby reducing overall control signaling overhead while maintaining transmission reliability
3Reliability
If the UE monitors PDCCH frequently to detect grant cancellations, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The UE performs PDCCH monitoring at periodic intervals defined by search space configurations rather than continuously. This periodic action allows the UE to detect grant cancellation indications reliably while consuming less power by entering low-power states between monitoring occasions, thus balancing reliability and energy consumption
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, an indication of a first sidelink grant associated with a first set of resources. The UE may receive, from the network entity, an indication of a second sidelink grant associated with a second set of resources, wherein the first set of resources at least partially overlaps in a time domain with the second set of resources. The UE may perform an action based at least in part on the first set of resources at least partially overlapping in the time domain with the second set of resources. The UE may transmit one or more sidelink messages using at least one of the first sidelink grant or the second sidelink grant based at least in part on performing the action. Numerous other aspects are described.