Scheduling Request Cancellation for Beam Failure Recovery in 5G
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Solution Overview
Problem
The existing 5G wireless communication system faces challenges in efficiently handling scheduling request (SR) cancellation and concurrent beam failure recovery (BFR) on secondary cells, leading to delays and undesirable termination of BFR processes.
Innovation Solution
A method is introduced to identify and manage SRs triggered for BFR on secondary cells, allowing for selective cancellation of SRs and prioritization of BFR processes, enabling concurrent handling of BFR events between primary and secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all pending SRs are cancelled when a MAC PDU including BSR MAC CE is transmitted, then SR cancellation is simplified, but SRs triggered for SCell BFR are incorrectly cancelled causing BFR delays
Solution Approach 1:
The patent segments the SR cancellation logic by distinguishing between different SR types (BSR-triggered SRs versus BFR-triggered SRs). Instead of cancelling all SRs uniformly, the invention selectively cancels only BSR-triggered SRs while preserving BFR-triggered SRs, thereby resolving the contradiction between simplification and reliability.
Solution Approach 2:
The patent applies local quality by assigning different cancellation behaviors to different SR instances based on their triggering causes. BFR-triggered SRs are protected from cancellation while BSR-triggered SRs are cancelled, creating differentiated quality of treatment for different SR types within the same system.
2Productivity
If SR resources are configured for SCell BFR, then BFR process is prioritized, but SR cancellation may still terminate BFR undesirably
Solution Approach 1:
The patent configures SR resources in advance specifically for BFR purposes, preparing the system beforehand to handle BFR events efficiently. This preliminary configuration ensures that when BFR is triggered, dedicated resources are already available, enabling fast BFR execution while the invention simultaneously protects these configured SRs from erroneous cancellation.
3Adaptability or versatility
If concurrent BFR on PCell and SCell is handled independently, then each BFR can proceed separately, but resource conflicts and coordination issues arise
Solution Approach 1:
The patent implements a universal SR management mechanism that handles both PCell and SCell BFR scenarios through the same selective cancellation logic. The invention creates a multi-functional framework that can manage concurrent BFR events on different cell types using consistent principles, thereby reducing coordination complexity while maintaining versatility.
Data Source
AI summary
A communication method and system for converging a 5th generation (5G) communication system for supporting higher data rates beyond a 4th generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a terminal for handling scheduling request (SR) cancellation in a wireless communication system is provided. The method comprises identifying that at least one first SR is triggered, identifying whether each of the at least one first SR is triggered for beam failure recovery (BFR) of a secondary cell (SCell), and determining whether to cancel each of the at least one SR based on the identification.