LTE Radio Re-establishment Timer for Signaling Overhead Reduction
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Solution Overview
Problem
In heterogeneous LTE networks, frequent handovers between macro and small base stations result in significant signaling overhead due to increased inter-cell interference and complex cell deployments, especially for rapidly moving user equipment (UE).
Innovation Solution
A radio connection re-establishment method that involves measuring neighboring cells to determine the cell of highest signal quality, starting a timer based on preset conditions, and triggering a radio resource control (RRC) re-establishment procedure if synchronization is not maintained, thereby reducing unnecessary handovers and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent handovers are performed between macro and small base stations to maintain connection quality, then the UE can stay connected to the optimal cell, but signaling overhead increases significantly
Solution Approach 1:
The patent applies preliminary action by introducing a timer mechanism that starts when handover conditions are met but execution is delayed. The timer gives the network a pre-planned window to wait for better conditions before forcing handover, reducing unnecessary signaling while maintaining connection quality.
Solution Approach 2:
The patent implements dynamics by making the handover decision process adaptive and condition-dependent. The timer duration and handover triggering are dynamically adjusted based on real-time measurement of signal quality, interference levels, and network conditions, allowing flexible optimization of the handover process.
2Reliability
If handover decisions are made based on immediate signal quality measurements, then connection quality is maintained, but unnecessary handovers occur due to temporary signal fluctuations
Solution Approach 1:
The timer mechanism serves as a preliminary buffer that prevents immediate handover decisions based on transient signal conditions. By waiting for the timer to expire or for sustained improvement in signal quality, the system filters out temporary fluctuations and makes more stable handover decisions.
Solution Approach 2:
The patent implements feedback by continuously monitoring signal quality, interference levels, and timer status, then using this information to dynamically adjust handover decisions. The system feeds back measurement results to the decision-making process, allowing iterative optimization of connection management.
3Loss of time
If the timer duration is extended to reduce frequent handovers, then signaling overhead is reduced, but connection establishment time increases
Solution Approach 1:
The patent applies dynamics by making the timer duration adaptive rather than fixed. The timer length is dynamically adjusted based on network conditions, UE mobility patterns, and signal quality trends, allowing optimization of the balance between reducing unnecessary handovers and maintaining fast connection establishment.
Solution Approach 2:
The patent implements parameter changes by modifying the timer duration parameter based on various conditions such as signal quality thresholds, interference levels, and network load. This dynamic parameter adjustment allows the system to optimize performance metrics in real-time without being constrained by a fixed timer value.
Data Source
AI summary
A radio connection re-establishment where first preset numbers and/or durations are obtained. The multiple present numbers and/or durations correspond to one or more of, different cell coverage ranges of different types of cells, different transmit power strengths of the different types of cells, physical cell identifiers (PCIs) of the different types cells, types of the different types of cells, and/or first ranges of the different types of cells. A first range of a cell, among the different types of cells, is a range in which a signal strength of the cell in a coverage range of a macro cell, among the different types of cells, is greater than a signal strength of a macro cell among the different types of cells. The first present numbers and/or durations are sent to a user equipment (UE).