Amorphous Cell Emulation for Reducing Handover Overhead in Dense Small Cells
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Solution Overview
Problem
In next-generation mobile communication systems, a large number of small cells in a specific area cause frequent handovers for user equipment (UE), leading to significant overhead due to the handover procedure, as existing technologies do not effectively manage the integration of small cells as a single large cell.
Innovation Solution
The proposal involves operating multiple small cells as a single large cell, referred to as an 'amorphous cell,' where one cell emulates a target cell, allowing the UE to recognize multiple cells as a single entity, thereby reducing the need for frequent handovers. This is achieved through Cooperative Multi-point (CoMP) techniques and emulation schemes, where cells transmit their own and target cell-specific signals to maintain seamless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of small cells are arranged in a specific area to increase network capacity, then network coverage and traffic processing capability are improved, but handover overhead increases significantly
Solution Approach 1:
The patent merges multiple small cells into a single amorphous cell structure where multiple transmission points (TPs) cooperate as one logical cell. The UE is configured with multiple TPs but performs only one handover to the amorphous cell rather than individual handovers to each small cell, thereby reducing handover overhead while maintaining the network capacity benefits of dense small cell deployment.
2Productivity
If multiple small cells are deployed to enhance network performance, then traffic processing capability is improved, but the complexity of handover procedures increases
Solution Approach 1:
The patent segments the handover procedure into two levels: at the physical layer, multiple TPs are independently managed for traffic processing, while at the logical cell level, they are grouped into a single amorphous cell that handles handover as one unit. This segmentation allows complex multi-TP traffic handling without proportionally increasing handover complexity.
Solution Approach 2:
The amorphous cell structure acts as an intermediary between the UE and multiple TPs. The UE interacts with the amorphous cell as a single entity for handover purposes, while the amorphous cell internally manages multiple TPs for traffic processing. This intermediary abstraction layer simplifies the handover procedure while preserving traffic processing capabilities.
3Reliability
If frequent handovers are performed to maintain connectivity in dense small cell areas, then connection reliability is improved, but system overhead increases
Solution Approach 1:
By merging multiple small cells into a single amorphous cell, the patent reduces the number of handover events while maintaining connection reliability. The UE experiences fewer handovers because it treats multiple TPs as one logical cell, thereby reducing the energy consumption and system overhead associated with frequent handover procedures while still maintaining reliable connectivity through multi-TP cooperation.
Data Source
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AI summary
One embodiment of the present specification provides a data channel reception method. The method can comprise the steps of: receiving, from a first cell, a cell-specific reference signal (CRS) and a data channel; receiving, from a second cell, configuration information of an MBMS over a single frequency network (MBSFN) subframe according to the movement from the first cell to the second cell; receiving, from the second cell, the CRS and the data channel of the first cell on at least one MBSFN subframe according to the configuration information; and demodulating the data channel received from the second cell on the basis of the CRS of the first cell received from the second cell.