Mobility Management via Cell Set Segmentation for Multi-Cell Handover
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Solution Overview
Problem
In mobile communication systems, managing mobility across multiple cells is complex, especially when user equipment (UE) communicates with different cell sets in uplink and downlink directions, as each cell manages mobility separately, leading to complications in maintaining performance.
Innovation Solution
A method and apparatus for mobility management that involves obtaining cell set information, selecting a target cell set for handover, and providing information about the target cell to the UE, including sending resource reallocation messages and control information through control channels to facilitate seamless handovers between cell sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each cell manages mobility for the UE separately, then the UE can communicate with multiple cells in uplink and downlink directions, but the complexity of maintaining mobility performance increases significantly
Solution Approach 1:
The patent segments the mobility management function by introducing a primary cell that handles control plane signaling separately from secondary cells that handle data transmission. This segmentation allows the UE to communicate with multiple cells while only one cell (the primary cell) manages mobility, thereby reducing complexity while maintaining multi-cell communication capability
Solution Approach 2:
The patent introduces an intermediary mechanism where the primary cell acts as a mediator between the UE and multiple secondary cells. The primary cell receives measurement reports from the UE and makes handover decisions, while secondary cells focus on data transmission. This intermediary approach simplifies mobility management by centralizing control functions
2Productivity
If carrier aggregation with multiple centralized cells is used, then spectrum efficiency and user throughput are improved, but the complexity of managing multiple cell connections increases
Solution Approach 1:
The patent merges the control plane functions of multiple cells into a single primary cell, while data plane functions are distributed across multiple cells including secondary cells. This merging of control functions reduces connection management complexity while the distributed data plane maintains high user throughput through carrier aggregation
3Reliability
If CoMP with multiple distributed cells is implemented, then uplink and downlink communication performance is improved, but the complexity of coordinating multiple cells increases
Solution Approach 1:
The patent segments CoMP operations by designating one cell as the primary cell for control functions and other cells as secondary cells for coordinated data transmission. This segmentation maintains the performance benefits of CoMP while reducing coordination complexity by centralizing mobility management in the primary cell
Solution Approach 2:
The primary cell serves as an intermediary that coordinates the activities of multiple distributed secondary cells. It receives measurement reports, makes handover decisions, and manages the coordination between secondary cells, thereby reducing the overall complexity of CoMP implementation while maintaining communication performance
Data Source
AI summary
A method for mobility management, an apparatus and a User Equipment (UE) are disclosed. The method includes: obtaining cell set information sent by a cell set in an access network; selecting a target cell set to which a UE may hand over according to the cell set information, and sending information about selection of the target cell set to the target cell set; and receiving information about at least one target cell decided by the target cell set, and providing the information about the target cell to the UE for handover. The method for mobility management between cell sets simplifies mobility management in multi-cell communication and improves performance of the communication system.