NTN RRC Connection Release via Common Offsets and Delayed Application
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Solution Overview
Problem
The 5G communication system's non-terrestrial network (NTN) faces challenges in efficient operation due to long propagation delays and high propagation losses, particularly in determining accurate timing for PUSCH transmission slots in satellite-based networks, which affects data transmission and reception.
Innovation Solution
A method for a terminal in the NTN that receives RRC control messages including common offsets and a reference position, allowing it to determine PUSCH transmission slots and apply information elements for transitioning to an inactive state, thereby optimizing data transmission and reducing propagation delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If common offsets and reference positions are used to determine PUSCH transmission slots in NTN, then timing accuracy is improved, but device complexity increases due to additional parameters and calculations
Solution Approach 1:
The network pre-configures common offsets (commonOffset1, commonOffset2, commonOffset3) and reference positions in RRC control messages before the terminal needs to determine PUSCH transmission slots. This preliminary provision of timing parameters eliminates the need for complex real-time calculations, resolving the contradiction between timing accuracy and device complexity
Solution Approach 2:
Common offsets act as intermediary parameters that mediate between the reference position and the final PUSCH transmission slot determination. Instead of directly calculating transmission timing from first principles, the terminal uses these intermediary offset values to simplify the timing calculation process while maintaining accuracy
2Speed
If information elements are applied immediately upon receipt, then state transition responsiveness is improved, but communication reliability deteriorates due to propagation delays in NTN
Solution Approach 1:
The terminal receives and stores information elements indicating state transitions in advance, but delays their actual application until the propagation delay period has elapsed. This preliminary reception followed by delayed execution ensures that state transitions are applied at the correct time, resolving the contradiction between responsiveness and reliability in NTN environments with significant propagation delays
Data Source
AI summary
A method and apparatus for operation in NTN is provided. Method for operation in NTN includes receiving a first RRC control message including a common offset1 and a common offset2 and a common offset3 and a reference position in the first NR cell, transmitting the PUSCH of the second NR cell in the PUSCH transmission slot determined based on the common offset1, receiving a second RRC control message including an information element indicating a transition to the inactive state in the second NR cell, delaying application of the received information element for a first period from the moment of receiving the second RRC control message and applying the information element.