Mobility Control Using Extended Cell Offset for Small Cells
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Solution Overview
Problem
The existing mobility control methods in heterogeneous networks face challenges in extending the coverage of small cells due to a large difference in transmit power between small cell and macro cell base stations, which limits the effectiveness of cell reselection and measurement reporting.
Innovation Solution
A mobility control method that configures a measurement parameter including an extended-cell individual offset (E-CIO) and/or a range extension (RE) for user equipment, allowing it to determine reporting events for neighboring small cells with a greater range, facilitating extended coverage and efficient reselection or handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a small cell is deployed with lower transmit power to reduce interference and enable service offload, then system capacity and coverage extension are improved, but the range of existing CIO parameters becomes insufficient for effective cell reselection and measurement reporting
Solution Approach 1:
The patent introduces two new parameters (E-CIO and RE) that are scaled versions of the existing CIO parameter, effectively expanding the parameter range available for controlling cell reselection and measurement reporting. This allows the network to adapt to larger power differences between macro and small cells while maintaining the same control mechanisms.
2Productivity
If the difference in transmit power between small cell and macro cell base stations is increased to enable service offload, then small cell utilization is improved, but the effectiveness of cell reselection and measurement reporting deteriorates
Solution Approach 1:
By introducing E-CIO and RE parameters with extended ranges, the patent enables reliable cell reselection and measurement reporting even when transmit power differences between macro and small cells are large, thus maintaining service offload effectiveness while ensuring reliable mobility control.
3Area of stationary object
If existing CIO parameter range is used for small cell mobility control, then device complexity is kept simple, but coverage extension capability is limited
Solution Approach 1:
The patent maintains compatibility with existing CIO parameters while introducing new E-CIO and RE parameters, allowing the system to use extended parameters when needed for coverage extension while falling back to existing parameters for simpler scenarios, thus achieving multi-functionality without forcing complexity in all cases.
Data Source
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AI summary
Embodiments of the present invention provide a mobility control method and apparatus. The method includes: receiving a first message sent by a network-side device, where the first message includes first information used to indicate a measurement parameter, where the measurement parameter includes an extended-cell individual offset value and/or a range extension value, where the extended-cell individual offset value is used for measurement reporting, a range of the extended-cell individual offset value is greater than a range of a cell individual offset value, and the range extension value can be used for a cell reselection and measurement reporting; determining the measurement parameter according to the first information; and performing mobility control for the target cell according to measured quality of a target cell and the measurement parameter. The network-side device configures the measurement parameter including the extended-cell individual offset value and/or the range extension value, and a user equipment performs measurement reporting according to the extended-cell individual offset value having a range greater than that of the cell individual offset value, or a user equipment performs measurement reporting according to the cell individual offset value and the range extension value. Therefore, a requirement for extending a small cell can be met.