Downlink Scheduling Request Configuration for Low-Latency Resource Allocation
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Solution Overview
Problem
Current wireless communication systems lack a mechanism for a user equipment (UE) to request resource allocation in the downlink (DL) direction, which is crucial for low latency and efficient data transmission in scenarios like immersive XR services and AI/ML model updates.
Innovation Solution
Introduce SR configurations for resource allocation in the DL direction, categorized into groups (e.g., Group A for UL, Group B for both UL and DL, and Group C for DL) and specify purposes using RRC signaling, with conditions for triggering SR requests, including beam failure or consecutive NACKs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If SR configurations are introduced for DL resource allocation requests, then latency is reduced and resource allocation efficiency is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The SR configuration is segmented into multiple groups (first group for UL, second group for DL, third group for both UL and DL) with different purposes. Each group contains specific SR configurations that can be independently activated based on service requirements, allowing the system to selectively enable only the necessary groups to reduce complexity while maintaining low latency capability when needed.
Solution Approach 2:
The SR configuration groups are dynamically activated or deactivated based on service type and traffic conditions. The network can configure different SR groups for different services (e.g., immersive XR services, AI/ML model updates) and activate only the relevant groups, making the system adaptable and reducing unnecessary complexity while preserving low latency performance for time-sensitive applications.
2Adaptability or versatility
If multiple SR configuration groups are configured for different services, then service-specific optimization is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The third group of SR configurations is designed to handle both UL and DL directions with a single configuration set, providing multi-functionality. This universal configuration group can be used for services that require bidirectional communication, reducing the need for separate UL-only and DL-only configurations and thereby reducing signaling overhead while maintaining service-specific optimization capability.
3Reliability
If SR requests are triggered by beam failure or consecutive NACKs, then reliability is improved, but false triggering and resource waste may occur
Solution Approach 1:
The triggering conditions for SR requests are defined with specific parameters such as a threshold number of consecutive NACKs required before triggering an SR. By adjusting this threshold parameter, the system can balance between reliability (ensuring actual failures are detected) and resource waste (avoiding false triggers from temporary errors). This parameter-based control allows flexible optimization based on service requirements and channel conditions.
Data Source
AI summary
A user equipment (UE) including a transceiver and a processor is disclosed. The processor is configured to receive, via the transceiver and from a base station, a plurality of scheduling request (SR) configurations including a first SR configuration and a second SR configuration. The first SR configuration may correspond with a resource allocation request for data communication in a first set of directions, and the second SR configuration may correspond with a resource allocation request for data communication in a second set of directions. The processor is configured to determine whether a condition to request a resource allocation has occurred. In response to the determination that the condition to request the resource allocation has occurred, the processor is configured to select a SR configuration of the plurality of SR configurations, and transmit, via the transceiver and to the base station, a SR using the selected SR configuration.