SDT Beam Switching in RRC_INACTIVE for Mobile UE Reliability
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Solution Overview
Problem
There is no effective beam management for small data transmission (SDT) procedures in the RRC_INACTIVE state, leading to potential transmission failures due to poor beam quality caused by UE mobility, especially in higher frequency ranges.
Innovation Solution
Implement lightweight beam management and beam failure recovery procedures to enable beam switching during SDT, including beam measurement reporting, switching commands, and failure detection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam management procedures are implemented for SDT in RRC_INACTIVE state, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The beam management procedure is segmented into distinct functional components: beam measurement reporting by the terminal device, beam switching command transmission by the network device, and beam failure detection mechanisms. This segmentation allows each component to be optimized independently while maintaining overall system reliability without excessive complexity
Solution Approach 2:
The terminal device autonomously performs beam measurements and selects candidate beams based on measurement results, then reports only necessary information to the network device. This self-service approach reduces the complexity burden on the network device while ensuring transmission reliability through intelligent terminal-side processing
2Ease of operation
If lightweight beam management is implemented for SDT, then ease of operation is improved, but transmission reliability may worsen
Solution Approach 1:
The patent implements partial beam management procedures tailored specifically for SDT requirements rather than full beam management. Terminal devices perform essential beam measurements and reporting only when needed for SDT operations, providing sufficient reliability for small data transmissions while maintaining operational simplicity through selective application of beam management functions
Solution Approach 2:
The system dynamically adjusts beam management parameters such as measurement reporting thresholds and beam switching triggers based on SDT specific conditions. This allows the beam management to be as simple as needed while maintaining reliability by adapting parameters to the actual transmission requirements rather than applying fixed complex procedures
Data Source
AI summary
Various example embodiments relate to methods and apparatus that support beam management in a small data transmission procedure. A terminal device may comprise at least one processor and at least one memory. The at least one memory includes computer program code stored thereon. The at least one memory and the computer program code may be configured to, with the at least one processor, cause the terminal device to report one or more available beams in a small data transmission procedure, receive a beam switching command to switch a serving beam for the small data transmission procedure, and switch the serving beam for the small data transmission procedure to a target beam indicated in the beam switching command.