UE Gateway Selection for Wi-Fi Cellular Routing Stability
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Solution Overview
Problem
Wireless communication systems face inconsistencies and disruptions due to conflicting or absent protocols and entities across different wireless networks, particularly when user equipment (UE) needs to switch between legacy cellular radio networks and advanced networks like 5G NR SA, leading to inefficient connection management and potential ping-ponging between Wi-Fi and cellular connections.
Innovation Solution
The implementation of mechanisms by user equipment (UE) to establish connections using legacy gateways like EPDG, even when N3IWF and ANDSP are not configured, allowing it to preferentially route traffic through Wi-Fi or cellular networks based on received access policies, ensuring stable connections by maintaining links via EPDG when advanced networks become available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE uses legacy gateway EPDG to connect to EPC core network when N3IWF and ANDSP are not configured, then connection establishment is possible, but connection stability deteriorates due to frequent switching between Wi-Fi and cellular networks
Solution Approach 1:
The UE performs preliminary actions by establishing and maintaining a cellular connection with the 5G NR SA base station before needing to route traffic. The UE pre-configures and stores the cellular connection parameters and gateway information, so when traffic routing decisions are made, the UE can quickly switch between Wi-Fi and cellular networks without re-establishing connections, thereby improving connection stability while maintaining adaptability to different network conditions
2Productivity
If UE frequently switches between Wi-Fi and cellular networks based on access policies, then network optimization is achieved, but connection management complexity increases leading to ping-ponging
Solution Approach 1:
The UE implements feedback mechanisms by continuously monitoring the availability and status of both Wi-Fi and cellular networks. Based on this feedback, the UE makes informed routing decisions and maintains stable connections. The UE feeds back network status information to the policy decision point, which adjusts access policies dynamically, creating a closed-loop system that reduces ping-ponging while optimizing traffic routing
Solution Approach 2:
The connection management system becomes dynamic by allowing the UE to adapt its routing decisions based on real-time network conditions. The UE dynamically switches between Wi-Fi and cellular networks based on current availability and policy requirements, rather than being locked into a single connection type. This dynamic approach optimizes productivity while managing complexity through automated decision-making
3Adaptability or versatility
If UE establishes connection to 5G NR SA base station but N3IWF gateway is not configured, then advanced network access is available, but traffic routing to non-cellular networks becomes problematic
Solution Approach 1:
The UE uses the 5G NR SA base station as an intermediary when the N3IWF gateway is not configured. The base station mediates between the UE and the EPC core network, allowing the UE to access both cellular and non-cellular networks through the base station's routing capabilities. This intermediary approach enables advanced network access while simplifying traffic routing by using the base station's existing routing infrastructure
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may establish a cellular connection with a base station associated with a cellular radio network. The UE may receive an access policy of the cellular radio network identifying an access preference rule for the UE to adopt for connections to a core network function of the cellular radio network, the access preference rule indicating for the UE to preferentially connect to the core network function via a non-cellular radio network. The UE may determine that a gateway between the non-cellular radio network and the core network function of the cellular radio network is not configured. The UE may determine that a gateway selection policy of the cellular radio network is not configured. The UE may establish a connection to a legacy core network function of a legacy cellular radio network via a legacy gateway.