Layering community mobile communication system switching method

A mobile communication system and handover technology, which is applied in the handover field of hierarchical cell mobile communication systems, and can solve problems such as value deviation and handover deviation

Active Publication Date: 2007-03-28
SHANGHAI ULTIMATE POWER COMM TECH
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Problems solved by technology

[0018] The purpose of the present invention is to provide a handover method of a hierarchical cell mobile communication system to solve the problem of simply estimating the moving rate of the user terminal based on the time the user terminal resides in the cell without considering the moving direction of the user terminal in the prior art. The value is prone to deviation, which will cause the technical problem of deviation in subsequent switching

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  • Layering community mobile communication system switching method
  • Layering community mobile communication system switching method
  • Layering community mobile communication system switching method

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Embodiment Construction

[0056] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0057] Most of the existing solutions to the handover control problem in the hierarchical cell mobile communication system are based on the dwell time of the cell, and the factors that determine the dwell time of the user terminal in the cell are not only the size of the mobile speed of the user terminal, such as the user terminal The direction of movement also affects or determines the residence time of the user terminal in the cell. However, since it is difficult to obtain the direction of the moving speed of the user terminal, the handover algorithms in the existing hierarchical cell system do not take into account the directionality of the moving speed of the user terminal, so they cannot solve the problem as shown in Figure 2. handover problem. In the present invention, the switching control is determined by the average radial moving speed. No matter how long ...

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Abstract

It is a switching method for Hierarchical Cellular Mobile Communication System, including: (1) detecting the initial lead of two times of time in each preset time period and compute the time interval between the initial lead of adjacent two time; (2) estimating the radial velocity of the users vr, TTRUE_ADV_2 is the initial lead of the back time detected in the process (1), the TTRUE_ADV_1 is the initial lead of the front time detected in the process (1), c for the speed of light. DeltT is the time interval between the initial leads of two time ; (3) The switching control unit receives switching request for crossing the region launched by the user terminals, the current user radial velocity will be compared to the preset radial moving rate to determine the target layer and complete the switch to some small target region from the user terminal. Based on the timing initial lead, the invention calculates the user radial velocity, so it can consider the direction of terminal moving. The estimating value of the user radial velocity is more accurate and reliable.

Description

technical field [0001] The invention relates to a switching method of a communication system, in particular to a switching method of a layered cell mobile communication system. Background technique [0002] In a cellular mobile communication system, a cell with a smaller size can obtain a larger capacity and frequency reuse rate. However, a user terminal moving at a high speed cannot avoid frequently area switching problem. In addition, there will be "hot spot" areas in the system where calls are relatively concentrated, such as shopping centers, conference centers, business buildings and other areas. Cell congestion often occurs in these areas, causing user terminals to fail to communicate normally. Similarly, there will be blind spots in the system where signals cannot be covered, and the user terminal cannot perform call services in these blind spots. In order to solve these problems, a hierarchical cell structure is introduced into the cellular mobile communication sys...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04W36/04H04W36/32
Inventor 张雷胡金玲高卓
Owner SHANGHAI ULTIMATE POWER COMM TECH
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