Wireless UE Handover via Proximity Indication for IDC Interference
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Solution Overview
Problem
User equipment (UE) in wireless communication systems face interference and service preference issues when co-located with in-device coexistence (IDC) interference or when not receiving preferred services from the current serving cell, necessitating a method for handover to a more suitable cell.
Innovation Solution
The UE determines if the current serving cell is not preferred due to IDC interference or lack of preferred services and transmits a message requesting a handover to another cell, which can be a CSG cell, small cell, pico cell, or femto cell, operating in different radio access technologies, using a proximity indication with a specified cause.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE remains connected to the current serving CSG cell, then the connection is stable and simple, but the UE experiences IDC interference and cannot receive preferred services
Solution Approach 1:
The network acts as an intermediary by receiving the proximity indication message from the UE and making the handover decision. The UE reports the interference condition and preferred cell to the network, which then coordinates the handover process, resolving the conflict between maintaining stable connection and avoiding interference.
Solution Approach 2:
The system changes the serving cell parameter from the current CSG cell to a target cell based on the UE's reported preferences and interference conditions. This parameter change enables the UE to transition from a interfering environment to a preferred service environment.
2Adaptability or versatility
If the UE requests handover to another cell, then the UE can access preferred services and avoid interference, but the system complexity increases due to additional signaling
Solution Approach 1:
The UE performs preliminary actions by measuring and identifying the preferred cell and preparing the proximity indication message before requesting handover. This preliminary preparation streamlines the handover process by having all necessary information ready, reducing the complexity of the actual handover signaling.
Solution Approach 2:
The system uses feedback mechanisms where the UE reports its service preferences and interference conditions to the network, which then makes informed handover decisions. This feedback loop enables adaptive handover without requiring complex centralized control, as the network responds to UE-reported conditions.
3Speed
If the UE performs autonomous cell selection, then the handover can be initiated quickly, but the network loses control over the handover process
Solution Approach 1:
The UE performs preliminary measurements and identifies preferred cells autonomously, preparing handover information in advance. This allows quick handover initiation when conditions change, while the network retains control by receiving and approving the handover request through the proximity indication message.
Solution Approach 2:
The UE autonomously monitors its own service conditions, identifies interference problems, and selects preferred target cells. This self-service capability enables fast handover initiation, while the network maintains oversight by receiving the proximity indication and coordinating the actual handover execution.
Data Source
AI summary
A method and apparatus for transmitting a message in a wireless communication system is provided. A user equipment (UE) determines that a first cell, serving the UE currently, is not preferred, and transmits a message, to the first cell, including a request for a handover from the first cell to a second cell.