NTN UE SSB Selection via Service Duration Assistance
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Solution Overview
Problem
In Non-Terrestrial Networks (NTNs), User Equipment (UE) faces challenges in properly selecting synchronization signals, which can lead to impactful latency due to insufficient available service duration of selected beams.
Innovation Solution
A method for UE to detect synchronization signal blocks (SSBs) transmitted by NTN cells, determine their identifiers, maintain assistance information including presentation order and available service duration, and select an SSB based on this information to ensure sufficient service duration for random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UE selects SSB based on predefined criteria without considering service duration, then the selection process is simple and fast, but latency is introduced due to insufficient available service duration
Solution Approach 1:
The network performs preliminary action by providing assistance information (presentation order and/or available service duration) about SSBs before the UE needs to make its selection. This allows the UE to make an informed decision about which SSB to select, ensuring sufficient service duration is available while avoiding unnecessary latency. The assistance information is prepared and transmitted in advance, enabling the UE to select the most appropriate SSB without last-minute delays.
2Adaptability or versatility
If UE detects and selects from multiple SSBs in overlapping beam areas, then coverage flexibility is improved, but selection accuracy deteriorates due to insufficient assistance information
Solution Approach 1:
The network provides feedback in the form of assistance information (presentation order and/or available service duration) about the detected SSBs to the UE. This feedback enables the UE to accurately evaluate which SSB to select from multiple detected signals in overlapping beam areas. The assistance information acts as feedback that guides the UE's selection decision, ensuring both coverage flexibility and selection accuracy are maintained.
Data Source
AI summary
The present disclosure provides a method for executing random access resource selection in UE served by an NTN. The method includes: detecting a synchronization signal block (SSB) transmitted by an NTN cell, based on a predefined communication resource associated with the SSB; determining an identifier (ID) associated with the detected SSB; maintaining assistance information, wherein the assistance information comprises at least one of the following: first information associated with a presentation order of the detected SSB; and second information associated with an available service duration d of a random access resource associated with the detected SSB; selecting one of the detected SSB as a first SSB based on the assistance information when a plurality of SSB are detected; and applying a random access resource associated with the first SSB for performing a random access procedure.