Sidelink Scheduling Request Cancellation for V2X
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting sidelink (SL) buffer status reports (BSR) and scheduling requests (SR) in NR V2X communication, particularly due to delays and priority conflicts that hinder timely and reliable data transmission for advanced services like URLLC.
Innovation Solution
The proposed method involves triggering SL BSR and SR transmissions, determining whether to cancel these transmissions based on factors such as the size of the UL MAC PDU, priority of logical channels, and configuration modes, to optimize resource allocation and ensure timely data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SL BSR transmission is triggered to report buffer status for SL logical channel, then data transmission efficiency is improved, but transmission delay increases due to priority conflicts with UL BSR
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the cancellation decision based on the priority levels of logical channels. When the SL logical channel priority is lower than or equal to the UL logical channel priority, the SL BSR transmission is cancelled. This priority-based parameter adjustment resolves the contradiction by ensuring that higher priority transmissions (UL BSR) are completed first, preventing delay in critical uplink data while still allowing SL BSR transmission when priorities permit.
2Productivity
If SL SR transmission is cancelled when UL MAC PDU is large enough to accommodate SL BSR, then resource allocation efficiency is improved, but transmission reliability deteriorates due to potential loss of SL BSR
Solution Approach 1:
The patent implements feedback by continuously monitoring the status of UL MAC PDU assembly and the triggering conditions for SL BSR. The system provides feedback through the cancellation decision mechanism that reviews whether the UL MAC PDU can accommodate the SL BSR before finalizing the transmission decision. This feedback loop ensures that resource allocation efficiency is maintained while preserving transmission reliability by only cancelling SL SR when the UL MAC PDU is confirmed to be sufficiently large.
3Adaptability or versatility
If autonomous resource selection mode is configured, then device autonomy is improved, but transmission reliability worsens due to cancellation of pending SL SR transmissions
Solution Approach 1:
The patent applies dynamics by making the resource selection process adaptive and configurable. The system dynamically adjusts its behavior based on the autonomous resource selection mode configuration. When this mode is enabled, the system autonomously decides to cancel pending SL SR transmissions to optimize resource allocation. This dynamic adaptation allows the system to balance device autonomy with transmission reliability based on operational conditions and configuration settings.
Data Source
AI summary
Embodiments of the present application are directed to a method and apparatus for SL SR and SL BSR transmission. In an embodiment of the present application, the method includes triggering a sidelink (SL) buffer status report (BSR) for an SL logical channel; triggering an SL scheduling request (SR) transmission triggered by the SL BSR for the SL logical channel; determining whether to cancel the triggered SL SR transmission; and canceling the triggered SL SR transmission in response to the triggered SL SR transmission being determined to be cancelled.