Cell Muting for Handover Signaling in Cellular Networks
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Solution Overview
Problem
State-of-the-art cellular networks face challenges in maintaining robust handover procedures, particularly in tight reuse environments where interference from neighboring cells disrupts service quality and reduces system capacity, making it difficult to achieve optimal handover timing and reduce interference during handover signaling.
Innovation Solution
The solution involves temporarily muting one or more dominant interfering cells during the handover signaling process to enhance the Carrier-to-Interference (C/I) ratio, thereby improving handover robustness and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tight frequency reuse is employed to maximize spectral efficiency, then spectral efficiency is improved, but interference from neighboring cells increases disrupting service quality
Solution Approach 1:
The system performs preliminary identification of dominant interfering cells before handover signaling occurs. By pre-identifying which cells will cause interference during handover, the network can proactively mute these cells at the appropriate time, preventing interference before it disrupts the handover process while maintaining tight frequency reuse for spectral efficiency
Solution Approach 2:
The muting configuration is dynamically adjusted based on real-time handover conditions. The network controller selectively mutes only the dominant interfering cells identified for each specific handover scenario, rather than applying static muting to all cells. This dynamic approach allows tight frequency reuse to be maintained for non-interfering cells while temporarily muting only those causing interference during handover
2Adaptability or versatility
If handover signaling is performed at cell borders, then handover capability is achieved, but radio conditions are poor making handover unreliable
Solution Approach 1:
The system applies preliminary anti-action by muting dominant interfering cells before handover signaling takes place. This pre-emptive muting counteracts the poor radio conditions at cell borders by eliminating the dominant interference sources, thereby improving the reliability of handover signaling without compromising the ability to perform handovers at cell borders
Solution Approach 2:
The network controller acts as an intermediary that coordinates between the serving cell, target cell, and dominant interfering cells. It sends muting commands to the interfering cells to temporarily reduce their transmission power or silence them during handover signaling, creating a more favorable radio environment for the handover process while maintaining normal operation for other users
3Reliability
If dominant interfering cells are muted during handover signaling, then handover robustness is improved, but network capacity may be reduced due to muted transmissions
Solution Approach 1:
The muting operation is applied locally and selectively only to the specific dominant interfering cells that are causing problems for a particular handover, rather than applying blanket muting to all cells. This localized approach ensures that handover robustness is improved for the affected handover while minimizing the impact on overall network capacity, as other cells continue to operate normally
Solution Approach 2:
The system applies partial muting by selectively silencing only the dominant interfering cells identified for each handover scenario, rather than muting all neighboring cells. This partial action is sufficient to improve handover robustness by eliminating the most problematic interference sources, while preserving network capacity by allowing non-interfering cells to continue their normal transmissions
Data Source
AI summary
In a telecommunication system, a method for improved handover signaling includes temporarily enhancing the radio environment of a user engaged in handover signaling by muting one or more dominant interfering cells during the signaling process, and coordinating the muting with the actual handover signaling.