Sidelink Scheduling Request Configuration for V2X Latency
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Solution Overview
Problem
In NR systems, there is a challenge in effectively configuring scheduling requests for sidelink communication, particularly for V2X services that require low latency, as existing methods lack specific configurations for prioritizing and managing scheduling requests efficiently.
Innovation Solution
The proposed solution involves a control method for user equipment (UE) that receives scheduling request configuration information from the network or base station, which includes specific parameters such as maximum allowable requests, prohibited times, periodicity, and PUCCH resource information, allowing for optimized scheduling request configurations based on priority and resource availability, and applies these configurations to V2X services while using random access for other services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If universal scheduling request configuration is used for all services, then device complexity is reduced, but scheduling request latency increases for high-priority services
Solution Approach 1:
The patent segments scheduling request configurations into multiple types (first type and second type) with different parameters. High-priority services like V2X use the first type configuration with shorter prohibit timers and higher maximum counts, while other services use the second type. This segmentation allows differentiated latency optimization without overwhelming complexity.
Solution Approach 2:
The patent applies local quality by assigning different scheduling request configuration parameters to different service types. Specifically, V2X services receive optimized configurations with sr-ProhibitTimer set to shorter values and sr-TransMax set to higher values, while non-V2X services use standard configurations. This localized optimization improves latency only where needed.
2Loss of time
If multiple scheduling request configurations are maintained for different services, then scheduling request latency is reduced for high-priority services, but device complexity increases
Solution Approach 1:
The patent introduces dynamic selection mechanisms where the UE determines which scheduling request configuration to use based on service type identification. The system dynamically switches between first type and second type configurations depending on whether the service is V2X or other services, optimizing latency without requiring manual configuration management.
Solution Approach 2:
The patent changes key parameters (sr-ProhibitTimer and sr-TransMax) based on service type. For V2X services, sr-ProhibitTimer is set to shorter values and sr-TransMax to higher values, while non-V2X services use standard parameter values. This parameter differentiation achieves latency optimization with manageable complexity through clear parameter specifications.
3Productivity
If scheduling request resources are allocated based on logical channel priority, then scheduling efficiency is improved, but resource management complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple scheduling request configurations with different parameters before service execution. The network configures first type and second type configurations in advance, and the UE selects the appropriate pre-configured type based on service type identification, avoiding real-time complex resource management decisions.
Data Source
AI summary
The present disclosure provides a control method for a user equipment, a control method for a base station, and a user equipment. The control method for a user equipment comprises receiving scheduling request configuration information related to a sidelink; and performing a scheduling related to the sidelink based on the received scheduling request configuration information, wherein the scheduling request configuration information is received from at least a network side or a base station side and comprises a scheduling request configuration identity (ID) or specific scheduling request configuration.