MTC Device Emergency Bearer Service Handling
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Solution Overview
Problem
In wireless communication systems, machine-type communication (MTC) devices face challenges in emergency bearer service handling due to network congestion, where they are often misidentified as low priority devices, leading to potential rejection of emergency attach procedures and disruption of ongoing calls during property changes.
Innovation Solution
A method where MTC devices camp on normal cells, suppress sending low priority indicators, or set them to zero in attach requests, and initiate emergency attach procedures to ensure network acceptance of emergency bearer services, preventing call drops during configuration changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MTC devices send low priority indicators during attach procedure, then network resource allocation is optimized for MTC devices, but emergency attach procedures are rejected during network congestion
Solution Approach 1:
The patent changes the priority parameter dynamically based on the attach type. When emergency attach is detected, the device temporarily suppresses or sets to zero the low priority indicator that would normally be sent, thereby changing the network's perception of device priority from low to normal/high for emergency services only. This resolves the contradiction by allowing emergency services to bypass congestion-based rejections while maintaining normal priority classification for regular MTC operations.
2Productivity
If MTC devices are identified as low priority during normal operation, then network congestion is managed effectively, but ongoing calls are dropped during device property changes
Solution Approach 1:
The patent performs preliminary detection of the attach type before sending priority indicators. By identifying emergency attach procedures in advance, the device can proactively adjust its indicator transmission strategy, preventing call drops before they occur. This preliminary action ensures that emergency services maintain stable connections during configuration changes while normal MTC devices continue to receive congestion management.
3Ease of operation
If normal attach procedure is used for emergency services, then device properties are updated correctly, but network cannot recognize emergency call status during congestion
Solution Approach 1:
The patent uses the attach type indicator as an intermediary mechanism to convey emergency service status to the network. By suppressing or modifying the low priority indicator specifically during emergency attach procedures, the device creates a clear signal that mediates between the normal MTC device classification and the urgent need for emergency service recognition, enabling the network to accurately identify and prioritize emergency calls.
Data Source
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AI summary
A method of handling an emergency bearer service for a mobile station in a wireless communication system is disclosed. The method comprises camping on a cell which provides a normal service or a limited service to the mobile station; and not sending an indicator to a network node when the mobile station attaches to a network for the emergency bear service, wherein the indicator indicates the mobile station is a machine type communication (MTC) device or a low priority device.