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A fast handover decision method for LTE system aided by geographic location information

A geographical location information and fast handover technology, applied in the field of communication systems, can solve problems such as not taking into account changes in signal quality, difficult to achieve performance, and unusable cellular networks, etc., to achieve short handover judgment time, less handover times, and handover judgment short time effect

Inactive Publication Date: 2016-02-03
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent only considers the linear network in the high-speed railway scenario, and the proposed method is only applicable to the case where the cells are linearly deployed along the railway, and cannot be used in ordinary cellular networks.
In addition, the method in this patent only uses location information and does not take into account the change of signal quality when making handover decisions. It is difficult to achieve better performance in an environment with complex geographical conditions.

Method used

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  • A fast handover decision method for LTE system aided by geographic location information
  • A fast handover decision method for LTE system aided by geographic location information
  • A fast handover decision method for LTE system aided by geographic location information

Examples

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Embodiment 1

[0024] A geographical location information-assisted LTE system fast handover decision method, the steps of which are as follows:

[0025] 1) Obtaining cell information: the user obtains the adjacent cell list, the location of the source base station and the adjacent base station and the path fading model, the antenna mode of the current cell and the adjacent cell from the currently connected source base station;

[0026] 2) Obtaining location information: Using GPS wireless positioning technology, users periodically obtain their own location information;

[0027] In this example, the period for the user to obtain the location information periodically is 1 to 2 seconds;

[0028] 3) Select the optimal cell: the user calculates the maximum distance between the user and each cell according to the current location, the location of the source base station and the adjacent base station, the antenna mode of the current cell and the adjacent cell, and using the path fading model and th...

Embodiment 2

[0051] A geographical location information-assisted LTE system fast handover decision method, the steps of which are as follows:

[0052] 1) Obtaining cell information: the user obtains the adjacent cell list, the location of the source base station and the adjacent base station and the path fading model, the antenna mode of the current cell and the adjacent cell from the currently connected source base station;

[0053] 2) Obtaining location information: Using GPS wireless positioning technology, users periodically obtain their own location information;

[0054] In this example, the period for the user to obtain the location information periodically is 1 to 2 seconds;

[0055] 3) Select the optimal cell: the user calculates the maximum distance between the user and each cell according to the current location, the location of the source base station and the adjacent base station, the antenna mode of the current cell and the adjacent cell, and using the path fading model and th...

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Abstract

The invention discloses a quick switch decision method for a geographical location information auxiliary LTE (long term evolution) system, comprising the steps that according to the user geographical location information obtained by GPS (global position system), and combining the positions of a source base station and adjacent base stations, and the antenna modes of a current cell and neighbor cells, the large-scale fading of a user and each cell is figured out by using a path fading module and an antenna gain formula, and the cell with the minimum large-scale fading is selected as the optimal cell; when the optimal cell is the same cell for continuous times, the cell is switched as the target cell; or after the optimal cell is figured out, the reference signal reception intensity of each cell is measured, the reference signal reception intensity of the optimal cell is reinforced and modified, and then the target cell is figured out through comparison. The quick switch handover decision method is simple and quick in decision calculation, can effectively improve the switching success rate of the system, reduce the switching frequency and is applicable to the LTE-A communication system under high-mobility scene.

Description

technical field [0001] Aiming at the communication system of long-term evolution technology (LTE) and its subsequent evolution (LTE-A) under high mobility conditions, the invention proposes a fast switching judgment method assisted by user geographic location information, which belongs to the technical field of wireless communication. Background technique [0002] Usually, in LTE and its LTE-A system, the handover process consists of three steps: handover measurement and judgment, handover preparation, and handover execution. Collaboration done. Handover measurement is performed by the user to measure the reference signal receiving strength (ReferenceSignalReceivingPower, RSRP) or reference signal receiving quality (ReferenceSignalReceivingQuality, RSRQ) of the current serving cell and adjacent cells, and it is processed by the physical layer L1 filter and the network layer L3 filter , if the handover decision criterion is met, a measurement report is formed and sent to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/00H04W36/24
Inventor 范平志费明
Owner SOUTHWEST JIAOTONG UNIV
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