Communication mode conversion method of mobile communication terminal apparatus

A communication method, mobile communication technology, applied in wireless communication, electrical components, transmission systems, etc.

Inactive Publication Date: 2008-11-12
INSPUR LG DIGITAL MOBILE COMMUNICATIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, there is currently no system capture method for DBDM terminals or technology for roaming (Roaming) methods

Method used

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  • Communication mode conversion method of mobile communication terminal apparatus
  • Communication mode conversion method of mobile communication terminal apparatus
  • Communication mode conversion method of mobile communication terminal apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The present invention will be described in detail below according to the accompanying drawings.

[0019] figure 1 It is a signal flow chart of the information exchange process between the terminal and the mobile communication system in the embodiment of the present invention.

[0020] Refer below image 3 and Figure 4 Describe it.

[0021] First, when the DBDM terminal is initialized, set the call to CDMA, and check whether it is an area where WCDMA and CDMA coexist through the system parameters of CDMA.

[0022] At this time, if it is determined that it is an area where WCDMA and CDMA coexist, the DBDM terminal sends an order to search for a WCDMA network to the internal WCDMA modem. Confirm the system parameter information here. If the BASE_CLASS field is '0010', it is considered to be an area where WCDMA and CDMA coexist.

[0023] In this way, if the WCDMA cell selection (Cell selection) of the WCDMA modem is successful and the location update (location update)...

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Abstract

PURPOSE: A method for switching a communication system of a mobile terminal is provided to allow handover of a DBDM(Dual Band Dual Mode) terminal mounting both CDMA and WCDMA communication systems between CDMA and WCDMA. CONSTITUTION: An initially set communication system is checked. It is determined whether a signal of the checked communication system is detected by searching a network of the checked communication system. If a signal of the corresponding communication system is detected within a predetermined time, a call proceeds according to the corresponding communication system. If the signal of the corresponding communication system is not detected, a different communication system is set.

Description

technical field [0001] The invention relates to a mobile communication system, in particular to a communication mode conversion method. Background technique [0002] With the development of mobile communication technology, data transmission at various speeds is required. [0003] It is therefore necessary to differentiate the data transmission speed of the call channel, for which channel codes are used. [0004] CDMA (Code Division Multiple Access: Code Division Multiple Access), as one of the new-generation digital mobile communication methods, uses spread spectrum technology. [0005] CDMA is proposed by Qualcomm (Qualcomm), and multiple users can share the same frequency band. [0006] For this reason, the inherent pseudo-noise code (PN code) of the user communication channel is used to distinguish users, and the clock frequency is extended by multiplying the PN code equivalent to tens of times the bandwidth of the voice data frequency band with the voice data on the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/32H04Q7/38H04L29/06H04W88/06H04W92/02
Inventor 郑基铉
Owner INSPUR LG DIGITAL MOBILE COMMUNICATIONS CO LTD
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