Roaming Network Attachment Using Preloaded eSIM Partner Data
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Solution Overview
Problem
Mobile devices experience significant network attachment delays when roaming due to the need to scan various channels without prior knowledge of the correct channels to connect to, leading to inefficient and time-consuming network reconnection.
Innovation Solution
The user equipment (UE) identifies an expected destination from travel-related messages, requests and preloads network information for the destination, including preferred roaming partner networks, frequency bands, and channels, into an e-SIM before arrival, allowing for a targeted scan upon arrival.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE scans various channels without prior knowledge to connect to a new operator's network, then the UE can find a available network, but it takes several minutes before connection is established
Solution Approach 1:
The system performs preliminary actions by detecting travel-related messages (emails, text messages) containing destination information before the UE arrives at the new location. The core network proactively retrieves roaming partner network information for the predicted destination and pre-loads it into the UE's e-SIM memory, so that when the UE arrives, the correct network parameters are already available, eliminating the need for extensive channel scanning and reducing attachment delay from several minutes to near-instantaneous connection.
2Reliability
If the UE scans the entire spectrum to find the correct channel, then the UE can ensure comprehensive network coverage, but the scanning process becomes time-consuming and inefficient
Solution Approach 1:
The core network performs preliminary retrieval of roaming partner network information based on predicted destination from travel messages before the UE arrives. This pre-fetched information including frequency bands, channel numbers, and network identifiers is stored in the UE's e-SIM memory in advance, allowing the UE to skip extensive spectrum scanning and directly attempt connection to the correct network upon arrival, thus maintaining connection reliability while dramatically improving reconnection efficiency.
3Loss of time
If the UE waits until arrival at the destination to retrieve network information, then the device memory is used efficiently, but the network attachment process is delayed
Solution Approach 1:
The core network acts as an intermediary that manages the complexity of memory operations. Instead of the UE autonomously deciding when and what to load into e-SIM memory, the core network proactively pushes roaming partner network information to the UE based on predicted destination from travel messages. This mediator approach reduces attachment delay by enabling advance information delivery while the core network handles the complexity of determining what information to load, simplifying UE memory management.
Data Source
AI summary
A communications device, e.g., UE, detects a text message or email indicating planned travel to a destination. The communications device determines, either directly or indirectly, the travel destination from text included in the detected text message or email. The communications device retrieves, e.g. via sending a request to its core network and receiving a response from the core network, roaming partner network information corresponding to the first destination. The communications devices loads, e.g. prior to departure, a portion of memory in the communications device, e.g., memory in its eSIM, with the received roaming partner network information. When the communications device arrives at the travel destination, the communications device is able to rapidly and efficiently establish a connection with a roaming partner access network providing wireless coverage at the destination by using the pre-loaded roaming partner network information.