EMM Mode Determination for UE Signaling Optimization
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Solution Overview
Problem
User equipment (UE) experiences unnecessary delays and signaling issues when moving from a cell supporting user plane (UP) EPS CIoT optimization to a cell not supporting it, leading to inefficient mobility management and increased processing load in the network.
Innovation Solution
The UE determines the EPS mobility management (EMM) mode efficiently by storing information about cell support for UP EPS CIoT optimization and adjusting its mode accordingly, reducing unnecessary changes and signaling load when moving between cells with different optimization support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the UE changes EMM mode when moving from a cell supporting UP EPS CIoT optimization to a cell not supporting it, then the network signaling is reduced, but the UE experiences unnecessary delays and increased processing load
Solution Approach 1:
The UE stores information about cell support for UP EPS CIoT optimization in advance. When moving to a new cell, the UE checks this stored information before changing EMM mode, allowing it to maintain the optimized mode temporarily even when the new cell doesn't support it, thus avoiding unnecessary mode changes and delays
Solution Approach 2:
The UE dynamically adjusts its EMM mode based on real-time cell support conditions while utilizing stored historical information. The system transitions from static mode changing to dynamic mode adjustment, where the UE can maintain optimized modes longer by checking stored cell capability information before making mode changes
2Adaptability or versatility
If the UE frequently changes EMM mode when moving between cells with different optimization support, then the network can adapt to different cell capabilities, but the processing load and signaling increase
Solution Approach 1:
The UE performs preliminary checks using stored cell capability information before changing EMM mode. This preliminary action prevents unnecessary mode changes and reduces the frequency of processing operations, thereby lowering the UE's processing load while maintaining necessary network adaptability
Solution Approach 2:
The UE uses stored copies of cell capability information to make mode determination decisions. Instead of continuously querying the network or performing complex real-time analysis, the UE relies on pre-stored information about cell support for UP EPS CIoT optimization, reducing processing complexity
Data Source
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AI summary
A method and a device for determining an evolved packet system (EPS) mobility management (EMM) mode in a wireless communication system are disclosed. More specifically, a method for determining, by a user equipment (UE), an EMM mode in a wireless communication system includes receiving, by the UE in an EMM-IDLE mode with suspend indication, from a base station a system information block (SIB) including information that a serving cell of the UE does not support user plane (UP) cellular Internet of Things (CIoT) EPS optimization; storing the information that the serving cell does not support the UP CIoT EPS optimization; and maintaining the EMM-IDLE mode with suspend indication if a procedure using an initial non-access stratum (NAS) message is not triggered and the serving cell is changed to a cell supporting the UP CIoT EPS optimization.