Advanced UE Satellite Access Behavior Discussion
Explore various options for UE behavior when accessing satellites without context and transitioning between S&F modes. Dive into proposed solutions and deployment requirements for seamless satellite connectivity. Additionally, delve into technical content regarding satellite topics for comprehensive discussion.
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Presentation Transcript
Agenda Rel-19: UE behavior when accessing satellites without UE context (<20 mins) Rel-19: UE behavior while transitioning between S&F mode and non-S&F mode (<10 mins) Rel-20: SID discussion (60 mins)
1. UE behavior when accessing satellites without UE context Editor s Note: It is for further consideration whether specific UE behaviour or clarification needs to be added to prevent the UE from accessing satellites where the NW is not expected to keep a UE context. . The main issue is that if a UE is accessing to a satellite without UE context, the network may reject the UE request. There are several proposals in this meeting: Opt 1: The satellite rejects the UE request with a S&F cause, then the UE takes this information into account to decide how to send the next NAS request, e.g., stop to send the request via a satellite out of the list. (S2- 2501961, HW)? Opt 2: The satellite rejects the UE request with a legacy cause indicating NAS congestion with optional back- off timer, the UE received the reject cause and NAS congestion indication keeps in EMM registered.(S2- 2501518, Nokia) Opt 3: The satellite rejects the UE request with a legacy cause together with additional info, so that the UE supporting S&F keeps in EMM registered. (DP S2-2501612, Ericsson) Opt 4: Adding a deployment requirement that the MME on the ground synchronizes UE context to all satellites. (S2-2501989, Xiaomi) Which option is the way forward?
2. UE behavior while transitioning between S&F mode and non-S&F mode 1) When a satellite serving the UE changes operation mode between S&F and non-S&F, e.g., due to feed link availability, whether the UE needs to send an attach request? Opt 1: Yes (S2-2502167, QC) Opt 2: The attach request is sent only when the UE has user data pending (DP S2-2501614, E///) 2) Whether a MME can trigger a TAU/detach-reattach procedure when a satellite serving the UE changes operation mode between S&F and non-S&F, e.g., due to feed link availability? Yes (S2-2501784, LG) or NO (S2-2502167, QC)
Rel-20 Satellite topic Go to SID file directly Discuss technical content of each WT one by one No more than 10 mins per each sub-WT
