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Soft-switch method in CDMA system

A soft handover and high-speed technology, applied in the field of soft handover, can solve problems such as dropped calls and untimely handover, and achieve the effect of reducing the call drop rate and improving the quality of wireless communication

Inactive Publication Date: 2009-10-28
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a soft handover method, which can solve the problem of call drop due to untimely handover of user terminals in the high-speed operating environment in the prior art

Method used

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Embodiment Construction

[0033] The core idea of ​​the present invention is to provide a soft handover method for a CDMA system user terminal in a high-speed motion environment. The method allows the UE to directly initiate a soft handover process without passing a measurement report when accessing a high-speed coverage cell. A base station establishes a connection with other same-frequency cells, and by initiating the soft handover process in advance, it can effectively reduce the call drop rate of the UE during high-speed movement and improve the user's wireless communication quality. The high-speed coverage cells in the present invention refer to those cells covering high-speed railways or expressways and cells used in similar high-speed scenarios, which can be set according to specific conditions.

[0034] figure 1 It is a schematic diagram of the coverage of two cells of the same base station in an embodiment of the present invention. CELL1 and CELL2 are two same-frequency cells of the same base ...

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Abstract

The present invention provides a method for soft handover of a user terminal in a CDMA system in a high-speed motion environment. The method allows the UE to directly initiate a soft handover process without passing a measurement report when accessing a cell covering a high-speed railway / highway. A base station establishes a connection with other same-frequency cells, and by initiating the soft handover process in advance, it can effectively reduce the call drop rate of the UE during high-speed movement and improve the user's wireless communication quality.

Description

technical field [0001] The invention relates to a communication technology, in particular to a soft handover method for a user terminal in a CDMA system in a high-speed motion environment. Background technique [0002] The CDMA system is a code division multiple access wireless communication system, and the signals between different base stations are distinguished by different scrambling codes, and the frequency reuse factor between the base stations can be 1. This enables the UE (user terminal) to receive the same signal from multiple base stations at the same time, and the signals transmitted by the UE can also be combined after being received by multiple base stations, which is the so-called soft handover. As the main feature of CDMA communication system, soft handover can improve the communication quality of users. [0003] With the development of social economy, people have higher and higher requirements for mobile communication, and high communication quality is also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/38H04W36/18H04W76/02
Inventor 叶环球
Owner HUAWEI TECH CO LTD
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