NTN Store-and-Forward Wait Timer for UE Re-Attempt Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing wait timers for Non-Terrestrial Network (NTN) Store and Forward (S&F) operations, particularly in scenarios where satellite connectivity is intermittently unavailable, leading to suboptimal re-attempts of procedures that can result in lost service opportunities for User Equipment (UE).
Innovation Solution
Implementing a wait timer mechanism for User Equipment (UE) to initiate or complete procedures like attach or tracking area update (TAU) only when a stable network connection is established, preventing unnecessary re-attempts during intermittent connectivity, and ensuring timely completion of S&F operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE initiates procedure re-attempts during intermittent satellite connectivity, then UE can maintain service availability, but unnecessary re-attempts occur leading to service loss
Solution Approach 1:
The network provides preliminary action by giving a wait timer indication to the UE before connectivity disruption occurs. This indication allows the UE to pre-configure its re-attempt behavior, knowing exactly when to retry procedures after disruption, thereby avoiding unnecessary re-attempts during intermittent connectivity while maintaining service availability.
2Loss of energy
If UE waits for network connection stability, then unnecessary re-attempts are prevented, but service availability may be delayed
Solution Approach 1:
The network provides feedback through the wait timer indication, giving the UE precise information about when to re-attempt procedures. This feedback mechanism eliminates the need for the UE to wait passively or guess when connectivity will stabilize, as the network explicitly tells the UE the optimal re-attempt timing, thus preventing both unnecessary delays and unnecessary re-attempts.
Data Source
AI summary
Methods, systems, and apparatuses are provided for wait timers of Non-Terrestrial Network (NTN) Store and Forward (S&F) in a wireless communication system, wherein a method for a UE comprises initiating a first procedure to a first network, wherein the first procedure is an attach, tracking area update (TAU) procedure, or a service request procedure, receiving a configuration of a wait time for an S&F operation, starting a first timer based on the wait time, wherein the UE is prohibited to initiate the first procedure to the first network for the S&F operation when the first timer is running, and stopping the first timer if the UE initiates or successfully completes a second procedure in a cell of a second network, wherein the second procedure is an attach, TAU procedure, or a service request procedure.