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User's terminal switch control method in mobile communication system

A mobile communication system and user terminal technology, applied in the field of user terminal switching control, can solve problems such as increasing power consumption, reducing switching efficiency, and unable to switch user terminals

Active Publication Date: 2007-10-10
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when switching from a macro cell to a micro cell, it is necessary to configure many neighboring cells for the user terminal. Cells are used as adjacent cells for measurement, which reduces handover efficiency and increases power consumption; in order to avoid this problem, many existing mobile communication systems limit the maximum number of adjacent cells that user terminals can simultaneously measure. Taking WCDMA systems as an example, user terminals The maximum number of adjacent cell numbers that can be measured is 32, which limits the handover from macrocell to microcell in the multi-coverage structure, and the user terminal may not be able to switch to the microcell with the best signal

Method used

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  • User's terminal switch control method in mobile communication system
  • User's terminal switch control method in mobile communication system
  • User's terminal switch control method in mobile communication system

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] As shown in FIG. 2 , the multi-layer coverage structure means that a macro cell includes multiple micro cells. The present invention is proposed for such a structure. The process flow of the preferred embodiment of the present invention is shown in Figure 3, including:

[0025] (1) Divide all microcells covered by the same macrocell into two or more logical cells, each microcell belongs to and only belongs to one logical cell, and all microcells in a logical cell have With the same carrier frequency and pilot channel parameters, keep a certain distance between the microcell base stations in the same logical cell to meet the interference requirements;

[0026] (2) After the user terminal initiates a call in the macro cell, the network side sends a measurement control command to the user terminal, notifying all logical cells under the coverage of the m...

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Abstract

The invention is invention is used for solving the problem of occupying resources when a terminal is switch from a macro-cell to a micro-cell. The method comprises: dividing all micro cells belonging to one macro-cell into several logical cells; all micro cells on one logical cell have same frequency carrier and downlink scrambling code; when making a switch, the logical cells are used as the target cells to select a logical cell with best signal quality; selecting a micro-cell with best signal quality; using the selected micro-cell as the serving cell of the user's terminal.

Description

technical field [0001] The invention relates to a user terminal handover control method in a cellular mobile communication system, in particular to a user terminal handover control method in a mobile communication system with macro-cell and micro-cell structures. Background technique [0002] In a cellular mobile communication system, due to the movement of user equipment (user terminal), the user terminal will move from the coverage area of ​​one cell to the coverage area of ​​another cell. In order to ensure the continuity of the call of the user terminal, it is necessary to switch the wireless connection between the user terminal and the base station from the original cell to a new cell, which is the handover process in the mobile communication system. The general process of handover is shown in Figure 1: the network sends a measurement control command to the user terminal to notify the user terminal of the parameters of the target cell to be measured; the user terminal m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04W36/04H04W36/30
CPCY02B60/50
Inventor 席光清黄明
Owner ZTE CORP
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