RedCap UE Inter-RAN Mobility With Time-Based NR Reconnection
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Solution Overview
Problem
Reduced capability (RedCap) user equipment (UE) may lose its New Radio (NR) network connection and be unable to reconnect to it after joining a Long-Term Evolution (LTE) network, due to LTE's SIB24 message identifying it as a high priority network, despite LTE not supporting RedCap services.
Innovation Solution
Implement a New Radio (NR) System Information Block One (SIB1) message that indicates whether RedCap UE can return to an NR network supporting RedCap functionalities, based on operation mode, allowing mobility and reconnection procedures between different radio access networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE network prioritizes its connection for RedCap UE, then connection stability is improved, but ability to reconnect to NR network is lost
Solution Approach 1:
The patent introduces a dynamic return allowance state that can change over time. The UE is allowed to reconnect to NR network after a return allowance time window expires, enabling dynamic adaptation between LTE connection stability and NR network reconnection capability based on temporal conditions
Solution Approach 2:
The patent changes the parameter of network selection by introducing a return allowance time window parameter. This parameter allows the UE to override LTE's permanent prioritization and enables conditional reconnection to NR network after the time window expires, transforming the static network preference into a time-dependent parameter
2Ease of operation
If UE follows LTE network prioritization, then ease of operation is improved, but service continuity is compromised
Solution Approach 1:
The patent implements a feedback mechanism where the UE receives system information from NR network indicating the return allowance state. This feedback allows the UE to automatically determine when it can reconnect to NR network after being camped on LTE network, enabling service continuity while maintaining ease of operation through automated decision-making
3Device complexity
If RedCap UE camps on LTE network, then device complexity is reduced, but access to RedCap services is lost
Solution Approach 1:
The patent applies preliminary action by having the UE store the return allowance state information received from NR network while camped on LTE network. This preliminary storage of network information enables the UE to automatically reconnect to NR network for RedCap services when the return allowance time window expires, without requiring complex real-time network evaluation
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a system information block one message via a first radio access network (RAN) that indicates a return allowance state for the UE that identifies whether the UE is allowed to reconnect to the first RAN from a second RAN. The UE may perform a mobility procedure from the first RAN to the second RAN, wherein the first RAN supports a set of services that are not supported by the second RAN. The UE may perform a reconnection procedure from the second RAN to the first RAN when both the second RAN and the first RAN are available to the UE, wherein the reconnection procedure is based at least in part on the return allowance state or a return allowance time window that the UE is allowed to reconnect to the first RAN.