Link-Dependent Scheduling Request Format for URLLC
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Solution Overview
Problem
Current wireless communication systems, particularly in new radio (NR) technologies, face challenges in achieving ultra-reliable low-latency communications (URLLC) due to varying channel conditions, which affect the reliability and latency of scheduling requests (SRs) between base stations (BS) and user equipment (UEs).
Innovation Solution
Implementing a link-dependent SR format, where the base station determines and assigns a scheduling request format to UEs based on their specific channel conditions, providing more protected formats for UEs with worse coverage and less conservative formats for those with better coverage, to enhance reliability and latency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single SR format is used for all UEs, then device complexity is reduced and ease of operation is improved, but reliability deteriorates for UEs with poor channel conditions
Solution Approach 1:
The patent applies local quality by assigning different SR formats to different UEs based on their specific channel conditions. Each UE receives a tailored SR format configuration that matches its link quality, ensuring that UEs with poor coverage get more robust formats while UEs with good coverage use simpler formats. This resolves the contradiction by improving reliability for vulnerable UEs without requiring all UEs to use complex formats.
Solution Approach 2:
The patent changes the SR format parameters (such as sequence length, cyclic prefix length, and resource allocation) based on channel conditions. The base station adjusts these parameters dynamically or semi-statically according to UE-specific measurements, allowing the system to optimize reliability for each UE while maintaining overall system efficiency.
2Reliability
If more protected SR formats are used for UEs with poor coverage, then reliability is improved, but latency increases due to additional processing and transmission time
Solution Approach 1:
The patent applies local quality by matching the protection level of SR formats to the specific channel conditions of each UE. Only UEs with poor channel conditions receive highly protected formats with longer sequences and extended cyclic prefixes, while UEs with good channel conditions use shorter, lower-latency formats. This ensures that latency is increased only where necessary for reliability.
Solution Approach 2:
The patent enables dynamic or semi-static adjustment of SR format parameters based on changing channel conditions. When channel conditions improve, the base station can switch a UE to a less protected, lower-latency format. This dynamic adaptation resolves the contradiction by adjusting protection levels in real-time rather than using fixed conservative formats for all UEs.
3Reliability
If link-dependent SR format assignment is implemented, then reliability for UEs with poor coverage is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements self-service by having UEs autonomously select SR formats from a pre-configured set based on their measured channel conditions and the configuration provided by the base station. The UE monitors its own link quality and independently determines the appropriate format, reducing the need for complex base station processing and signaling overhead while maintaining reliability.
Solution Approach 2:
The patent applies preliminary action by having the base station pre-configure multiple SR formats and provide selection criteria to UEs before actual SR transmissions occur. The UEs are equipped with the necessary configuration information in advance, allowing them to quickly select appropriate formats without requiring complex real-time negotiations, thus reducing signaling overhead and processing complexity.
Data Source
AI summary
Certain aspects of the present disclosure relate to wireless communication systems, and more particularly, to link-dependent scheduling request (SR) formats for ultra-reliable low-latency communications (URLLC) in communication systems operating according to new radio (NR) technologies. A method is provided, that may be performed by a base station (BS) for wireless communications. The method includes determining one or more channel conditions for a link between the BS and a user equipment (UE). The BS assigns a SR format to the UE based on the one or more channel conditions. The UE receives the SR format assignment and transmits one or more SR transmissions to the BS according to the assigned SR format.