UE Coverage Enhancement with Call Continuity
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Solution Overview
Problem
Wireless network operators face coverage gaps when transitioning from legacy standards to LTE, leading to potential disconnections and costly roaming, as existing technologies struggle to maintain connectivity in environments with significant signal degradation.
Innovation Solution
User equipment (UE) devices are designed to switch between normal and enhanced coverage modes, utilizing techniques like sub-frame bundling and repetition techniques at the physical layer, enabling continued data connection in environments with large path loss or deep in-building penetration conditions, without detaching from the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network operators transition from legacy standards to LTE, then network modernization and performance improvement are achieved, but coverage gaps arise causing disconnections and roaming issues
Solution Approach 1:
The system dynamically switches between normal coverage mode and enhanced coverage mode based on real-time signal conditions. The UE monitors downlink signal quality and transitions to enhanced mode when coverage degradation is detected, maintaining continuous connectivity despite the transition to LTE standards.
Solution Approach 2:
The patent changes physical layer transmission parameters to improve coverage. Sub-frame bundling combines multiple sub-frames to enhance signal strength, and repetition techniques transmit data multiple times to ensure reliable delivery in degraded coverage areas, directly addressing the coverage gap problem.
2Area of stationary object
If enhanced coverage modes are implemented, then coverage extension and call continuity are improved, but device complexity and processing overhead increase
Solution Approach 1:
The system implements dynamic mode switching between normal and enhanced coverage modes based on real-time signal conditions. The UE monitors downlink signal quality and transitions to enhanced mode when coverage degradation is detected, maintaining continuous connectivity while adapting device operation to current environmental conditions.
Solution Approach 2:
The UE autonomously monitors its own coverage conditions and self-manages the transition between normal and enhanced coverage modes without requiring complex network control. The device independently detects signal quality deterioration and activates appropriate coverage enhancement techniques, reducing overall system complexity.
Data Source
AI summary
A method for signaling and call continuity for coverage enhancement may include selecting a cell while a user equipment (UE) device is in a radio resource control (RRC) idle state, determining if a signal level from an evolved NodeB (eNodeB) associated with the cell is sufficient for normal coverage, exchanging data with a network in a normal UE device mode via the cell upon determining that the signal level is sufficient for normal coverage, determining if a signal level from the eNodeB associated with the cell is sufficient for enhanced coverage upon determining that the signal level is not sufficient for normal coverage, and exchanging data with the network in an enhanced UE device mode via the cell upon determining that the signal level is sufficient for enhanced coverage.