Network Reselection Back-Off Timer Management
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Solution Overview
Problem
In scenarios where a large number of users temporarily access local services during events, conventional mobile networks face congestion issues when these users attempt to re-register with their home network after the event, leading to prolonged registration times due to simultaneous registration requests.
Innovation Solution
Implementing a hosting network-specific timer and flexible back-off timer values to manage network re-selection, where the home network determines timer values based on the number of users and capacity, allowing registrations to be spread out and reducing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of users simultaneously attempt to re-register with their home network after using local services, then the network can restore normal service connectivity, but network congestion occurs leading to prolonged registration times
Solution Approach 1:
The patent segments the user base into different groups and assigns different back-off timer values to each group. The network node determines multiple subsets of WTRUs and calculates a specific timer value for each subset based on the number of users and network capacity, thereby distributing the re-registration load over time and preventing simultaneous registration attempts that cause congestion.
Solution Approach 2:
The patent implements dynamic timer value adjustment where the back-off timer is not fixed but is calculated based on real-time network conditions. The network node determines timer values dynamically by considering the number of susceptible WRTUs and the network's capacity to handle simultaneous registration requests, allowing the system to adapt to varying load conditions.
2Productivity
If the network accepts all simultaneous registration requests, then all users can return to their home network quickly, but network congestion and overload occur
Solution Approach 1:
The patent applies preliminary anti-action by implementing a back-off timer mechanism that prevents users from attempting re-registration immediately upon becoming available. Instead of allowing all users to reconnect simultaneously, the system proactively delays re-registration attempts using calculated timer values, thereby preventing network overload before it occurs.
Solution Approach 2:
The patent implements partial action by allowing only a controlled number of registration requests to be processed simultaneously based on network capacity. The network node determines the maximum number of simultaneous requests it can handle and uses this information to calculate appropriate back-off timer values, ensuring that not all users attempt re-registration at the same time but rather in a controlled, manageable sequence.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for managing net-work reselection for a high number of users. A Wireless Transmit/Receive Unit, WTRU, generates a registration request indicating that the WTRU has been temporarily connected to a hosting network and that the WTRU requests re-registration to a home network of the WTRU, sends the registration request intended for the home network, receives from the home network a hosting network-specific congestion-related registration reject message including a hosting network specific back-off time value, waits for time corresponding to the back-off time value has elapsed, and sends a further registration request to the home network. The back-off time value is determined by the home network from a number of WRTUs susceptible to attempt re-registration and a capacity of the home network to handle simultaneous registration requests.