Sidelink Scheduling Request Triggering for NR V2X QoS
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Solution Overview
Problem
In NR V2X systems, existing SR triggering mechanisms for sidelink data often fail to meet the delay requirements of services with high delay constraints, leading to transmission delays.
Innovation Solution
A method for triggering a scheduling request (SR) in a terminal device, which involves receiving a message from a network device with a first identifier and configuration parameters. The terminal device then triggers an SR based on these parameters if a regular sidelink buffer status report has been triggered and not canceled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an SR is triggered according to an SR triggering mechanism for sidelink data in an LTE V2X system, then the SR triggering process is simple, but services having a high delay requirement cannot request a sidelink resource in time
Solution Approach 1:
The patent segments the SR triggering mechanism by introducing separate triggering conditions for different logical channels (SL CCCH vs SL DTCH). This allows high-priority control messages to trigger SR immediately while low-priority data messages follow the original BSR-based triggering, thus reducing delay for time-sensitive services without overcomplicating the overall mechanism
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple SR resources (first SR resource and second SR resource) and establishing mapping relationships between logical channels and SR resources in advance. When an SR is triggered, the terminal can immediately use the pre-configured resource without additional processing delay, enabling time-critical services to request resources instantly
2Productivity
If an SR is triggered for every sidelink data transmission, then resource allocation responsiveness is improved, but unnecessary SR triggering increases
Solution Approach 1:
The patent applies local quality by assigning different SR triggering policies to different logical channels based on their specific requirements. SL CCCH messages (high priority) trigger SR immediately, while SL DTCH messages (low priority) trigger SR only when buffer status changes significantly. This selective approach ensures responsive resource allocation for critical services while avoiding unnecessary SR triggering for routine data transmissions
Solution Approach 2:
The patent implements partial action by not triggering SR for every single data transmission event. Instead, SR is triggered selectively based on logical channel type and buffer status conditions. This partial triggering approach maintains adequate resource allocation responsiveness while significantly reducing the number of unnecessary SR transmissions and associated energy consumption
Data Source
AI summary
A method, a device, and a system for triggering a scheduling request (SR) to meet quality of service (QoS) requirements of different services in a New Radio (NR) vehicle to everything (V2X) system and to avoid or reduce unnecessary SR triggering. The method includes that a network device sends a first message to a terminal device, where the first message includes a first identifier and one or more configuration parameters corresponding to the first identifier. The first identifier is of a first logical channel, and the first logical channel is of a sidelink (SL) radio bearer. Alternatively, there is a mapping relationship between the first identifier and the first logical channel.