UE Retry Throttling via Persistent Failure Lists
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Solution Overview
Problem
User equipment (UE) in 4G LTE networks may fail to connect due to network resource exhaustion or bandwidth issues, leading to excessive retry attempts that overuse network resources and degrade user experiences for other connected UEs.
Innovation Solution
The UE maintains a list of permanent EPS mobility management failure events and retry throttling timers, which are preserved during power cycles to prevent excessive attach requests by repopulating forbidden PLMN and TA lists and updating USIM status based on failure events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs retry procedures to reconnect after failure, then the connection reliability is improved, but the network resources are overused and other UEs experience degraded service
Solution Approach 1:
The patent applies preliminary action by maintaining retry throttling timers and forbidden PLMN/TA lists during power cycle operations. These mechanisms are preserved in memory across power states, allowing the UE to preemptively control retry behavior and prevent excessive attach requests before they can overuse network resources.
Solution Approach 2:
The patent implements feedback through the retry throttling mechanism that monitors and limits attach request frequency. When connection failures occur, the system feedbacks by activating retry throttling timers and updating forbidden lists, which then constrain subsequent retry attempts to prevent network resource exhaustion while still allowing legitimate reconnection efforts.
2Ease of operation
If the UE clears retry throttling timers and forbidden lists during power cycle, then the ease of operation is improved, but excessive attach requests are made causing network resource overuse
Solution Approach 1:
The patent maintains retry throttling timers and forbidden PLMN/TA lists in memory during power cycle operations. These control mechanisms are preserved across power states, allowing the UE to preemptively control retry behavior and prevent excessive attach requests while still enabling normal connection operations.
3Object-generated harmful factors
If the UE maintains retry throttling timers and forbidden lists during power cycle, then network resource overuse is prevented, but the device complexity increases
Solution Approach 1:
The patent applies universality by implementing a unified approach where the same memory preservation mechanism handles multiple functions: maintaining retry throttling timers, preserving forbidden PLMN lists, and retaining TA list information. This multi-functional approach prevents network resource overuse across different failure scenarios without requiring separate complex management systems for each function.
Data Source
AI summary
A device creates a list of permanent evolved packet system (EPS) mobility management (EMM) failure events associated with the device, where the list includes information associated with one or more permanent EMM failure events encountered by the device. The device stores the list of permanent EMM failure events, provides an attach request message to an access network, and receives, from the access network, a reject message as a response to the attach request message. The device performs a power cycle based on receiving the reject message, and erases, based on the power cycle, a forbidden public land mobile network (PLMN) list and a forbidden tracking area list maintained by the device. The device repopulates the forbidden PLMN list and the forbidden tracking area list with information included in the list of permanent EMM failure events.