Sidelink Semi-Persistent Scheduling Resource Adaptation
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Solution Overview
Problem
Current semi-persistent scheduling approaches for sidelink channels in V2X communication are inefficient, leading to underutilization of resources due to incorrect assumptions about resource availability and failure to adapt to changing traffic patterns, especially in scenarios with multiple quality of service requirements and bursty traffic.
Innovation Solution
The method dynamically adapts resource reservations by allowing UEs to declare establishment, alteration, or cancellation of semi-persistent scheduling reservations, enabling additional periodic resources and flexible frequency allocation, and using flags and time offsets to manage resource usage and reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If semi-persistent scheduling is used for sidelink channels, then resource allocation is simplified and signaling overhead is reduced, but resource utilization becomes inefficient and cannot adapt to changing traffic patterns
Solution Approach 1:
The patent applies dynamics by enabling UEs to dynamically update their resource reservation intentions through SCI messages. Instead of static semi-persistent scheduling, UEs can now adaptively modify their resource allocations based on changing traffic conditions, making the system movable and adjustable rather than fixed
Solution Approach 2:
The patent implements feedback mechanisms where UEs monitor the shared resource pool status and adjust their resource reservations accordingly. The SCI messages carry feedback about resource usage intentions, allowing the system to respond to changing conditions and optimize resource utilization based on actual traffic patterns
2Adaptability or versatility
If UEs autonomously select resources from shared resource pools, then adaptability to changing traffic patterns is improved, but signaling overhead increases and resource coordination becomes more complex
Solution Approach 1:
The patent makes the SCI message universal by using it for multiple purposes: initial resource reservation, updates to reservation intentions, and coordination with other UEs. This multi-functional approach reduces the need for separate signaling messages, thereby reducing overall signaling overhead while maintaining adaptability
Solution Approach 2:
The patent enables UEs to self-manage their resource allocations by autonomously selecting and updating their own reservations based on traffic needs. This self-service mechanism reduces dependency on network control signaling, lowering signaling overhead while maintaining high adaptability to changing traffic patterns
3Loss of information
If resource reservations are made periodically without updates, then signaling overhead is minimized, but reliability decreases due to incorrect assumptions about resource availability
Solution Approach 1:
The patent introduces feedback through periodic SCI messages that update resource reservation intentions. These feedback messages allow UEs to inform others about their current resource usage plans, ensuring that resource availability information remains accurate and up-to-date without requiring excessive signaling
Solution Approach 2:
The patent implements periodic updates of resource reservation information through scheduled SCI transmissions. This periodic action ensures that resource availability information is refreshed at appropriate intervals, maintaining reliability while keeping signaling overhead manageable through regular rather than continuous updates
Data Source
AI summary
A wireless communication method for dynamically adapting resource reservation of a sidelink channel using semi-persistent scheduling. The method includes receiving, at a first item of user equipment, a first and a second item of data for transmission via a semi persistent scheduling mode, and a status indication of a shared wireless resource pool of the first item of user equipment and one or more second items of user equipment; notifying, by the first item of user equipment, an initial semi persistent scheduling reservation for the first item of data to the one or more second items of user equipment via the shared resource pool; notifying, by the first item of user equipment, one or more second items of user equipment of a reservation of a wireless resource defined in the shared wireless resource pool according to a declaration comprised in a further semi-persistent scheduling reservation of the sidelink channel.