Logical Channel to SR Mapping for Low-Latency 5G Scheduling
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Solution Overview
Problem
The mapping relationship between logical channels and scheduling request (SR) configurations in 5G wireless communications needs to be clarified to meet the requirements for low latency in Ultra Reliable and Low Latency Communications (URLLC) scenarios.
Innovation Solution
A method and system for a base station and user equipment (UE) that involves sending and receiving indication information to establish a correspondence between multiple logical channels or bearers and SR configurations, associating each with subcarrier spacing (SCS) and/or transmission time interval (TTI), using radio resource control (RRC) signaling to define SR-related parameters, logical channel configurations, and bearer configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple SR configurations are configured for UE with mapping relationship between logical channels and SRs, then scheduling flexibility and latency reduction are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The patent segments the scheduling request mechanism by introducing multiple SR configurations (first SR configuration and second SR configuration) with different periodicities. Each logical channel can be mapped to a specific SR configuration based on its requirements, allowing segmented handling of different traffic types with appropriate latency characteristics.
Solution Approach 2:
The patent implements dynamic SR configuration where the mapping between logical channels and SR configurations can be flexibly adjusted. The network can configure different SR periodicities for different logical channels, and the UE can dynamically select which SR configuration to use based on the active logical channels, providing adaptive latency optimization.
2Ease of operation
If one logical channel is mapped to one SR configuration or not mapped to any SR configuration, then configuration simplicity is improved, but scheduling flexibility and latency optimization capability deteriorate
Solution Approach 1:
The patent creates a universal SR configuration framework where a single SR configuration structure can serve multiple purposes. The first SR configuration handles latency-sensitive traffic while the second handles other traffic, but both use the same configuration format and management mechanisms, maintaining operational simplicity while providing scheduling flexibility.
Solution Approach 2:
The patent applies local quality by allowing different mapping relationships for different logical channels. Each logical channel can be individually configured to map to an appropriate SR configuration based on its specific requirements, while the overall system maintains a unified configuration approach. This enables targeted optimization for specific channels without complicating the entire system.
Data Source
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AI summary
The present disclosure provides a method used in a base station, comprising: sending indication information to user equipment (UE), the indication information indicating a correspondence between multiple logical channels or bearers and multiple scheduling request (SR) configurations, wherein each logical channel or bearer is associated with a subcarrier spacing (SCS) and/or transmission time interval (TTI).