Cell Priority List for Emergency Call Reliability
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in establishing emergency calls, as they lack a systematic approach to prioritize cell attachment attempts based on previous failure records, leading to repeated failures and suboptimal service delivery.
Innovation Solution
A communications apparatus that maintains a low priority list of cells that have previously failed to establish emergency calls, using this list to prioritize cell attachment attempts and avoid repeating failures by trying to attach to cells with higher priority first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system attempts to attach to cells without prioritization based on previous failures, then the cell attachment process is simple, but the reliability of emergency call establishment deteriorates due to repeated failures
Solution Approach 1:
The system performs preliminary actions by maintaining a low priority list of cells that have previously failed to establish emergency calls. Before attempting cell attachment, the system checks this pre-established list to identify and avoid cells with poor emergency call performance, thereby improving reliability without adding complex real-time decision-making processes.
Solution Approach 2:
The system implements feedback by recording the outcomes of previous emergency call attempts and using this information to prioritize future cell attachment decisions. The low priority list is dynamically updated based on feedback from attachment successes and failures, allowing the system to learn from past experiences and improve emergency call establishment reliability.
2Reliability
If the system maintains a low priority list and prioritizes cell attachment attempts, then the service reliability improves, but the complexity of the communications apparatus increases
Solution Approach 1:
The communications apparatus serves itself by autonomously maintaining and utilizing the low priority list without requiring external network assistance or complex centralized control. The device independently tracks its own attachment failures, updates the priority list, and makes intelligent cell selection decisions, thereby improving service reliability while keeping the added complexity minimal and self-contained.
3Loss of time
If the system repeatedly attempts attachment to the same failed cells, then the attach procedure remains simple without prioritization logic, but the time to establish emergency calls increases due to repeated failures
Solution Approach 1:
The system performs preliminary identification of problematic cells by maintaining a low priority list before the actual attach procedure begins. This pre-screening action allows the system to quickly skip cells with poor emergency call performance, significantly reducing the time to establish emergency calls without adding complex real-time evaluation logic during the attach process itself.
Data Source
AI summary
A method for efficient wireless communications performed by a communications apparatus includes determining a cell according to a low priority list; and performing an attach procedure to try to attach to the cell for establishing an emergency call through the cell. The low priority list comprises information regarding a public land mobile network (PLMN) identity (ID), tracking area (TA) code, a cell ID and/or a closed subscriber group (CSG) ID of at least one attempted cell through which the communications apparatus has attempted but failed to establish an emergency call.