UE Radio Capability Signaling for 4G-5G Mobility Synchronization
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Solution Overview
Problem
In next-generation wireless communication systems, there is a need for methods to handle radio access-related information when user equipment (UE) moves between 4G and 5G networks, as the AMF and MME entities managing mobility and session management are separated, leading to mismatches and non-transmission of critical information.
Innovation Solution
A method is proposed where UE and network nodes process radio access-related information using Non-Access Stratum (NAS) messages, notifying and synchronizing information when nodes support or do not support radio access, and providing methods for communication in environments where synchronization is lacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio access-related information is transmitted using NAS messages between UE, MME, and AMF, then information synchronization is improved, but message complexity and processing overhead increase
Solution Approach 1:
The patent segments the mobility management functions by separating MME (4G) and AMF (5G) entities, allowing radio access information to be transmitted and processed through dedicated NAS message pathways. This segmentation enables targeted information synchronization without requiring complete system redesign, resolving the contradiction by organizing complexity into manageable functional blocks.
Solution Approach 2:
The patent introduces NAS messages as an intermediary mechanism between UE, MME, and AMF entities. These standardized messages serve as a common language that facilitates information exchange across different network generations (4G and 5G), reducing processing complexity by providing pre-defined communication protocols rather than requiring custom solution for each interaction scenario.
2Adaptability or versatility
If UE moves between 4G and 5G networks with separated MME and AMF entities, then network flexibility and 5G functionality are improved, but information mismatch and non-transmission of radio access information occur
Solution Approach 1:
The patent implements preliminary action by having the UE proactively transmit radio access-related information to both MME and AMF entities during mobility events. This advance transmission ensures that both 4G and 5G network entities possess the necessary information before handover occurs, preventing information loss that would otherwise result from the separated entity architecture.
Solution Approach 2:
The patent establishes feedback mechanisms where network entities (MME/AMF) acknowledge receipt and processing status of radio access information. This feedback loop enables real-time verification that information has been successfully transmitted and synchronized across the 4G-5G interface, preventing silent information loss that could occur in the separated entity architecture.
Data Source
AI summary
A method of a user equipment (UE) in a wireless communication system includes: transmitting, to a core entity, a tracking area update (TAU) request message including UE radio capability information associated with a UE radio capability identity (ID); receiving, from the core entity, a security mode command message for requesting UE radio capability ID information, based on the UE radio capability information; and transmitting, to the core entity, a security mode complete message including the UE radio capability ID information.