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A multi-mode terminal and a switching method for the multi-mode terminal

A multi-mode terminal and terminal technology, which is applied in multiplexing communication, time-division multiplexing system, network data management and other directions, and can solve the problems of large area, unable to realize the switching and occupation of multi-mode single-standby mode, etc.

Active Publication Date: 2018-05-18
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inclusion of two sets of independent digital baseband chips and two sets of independent power management chips, it takes up a larger area when laying out the board
Two sets of independent SIM card holders. Two SIM cards of different modes cannot be placed in any card holder at will. The USIM / SIM card of any card holder can be read and written by any mode, which can realize multi-mode and multi-standby, but not Switching between multi-mode and single-standby modes

Method used

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  • A multi-mode terminal and a switching method for the multi-mode terminal
  • A multi-mode terminal and a switching method for the multi-mode terminal
  • A multi-mode terminal and a switching method for the multi-mode terminal

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Embodiment Construction

[0043] This embodiment provides a multi-mode terminal, which realizes multi-mode and multi-standby, such as LTE and GSM dual-standby, LTE multi-mode single-standby terminal, with one card (USIM or SIM card) multi-mode, dual-card dual-standby functions.

[0044] In addition to the two RF chips having independent voltage-controlled temperature-compensated crystal oscillators (VCTCXO1 and VCTCXO2 respectively) to provide reference clocks, add a clock path to provide the output clock of one RF chip to the other RF chip as a reference clock. When switching from dual-mode dual-standby to dual-mode single-standby, the two radio frequency chips share a clock reference source.

[0045] The pins of the two SIM cards are connected to the two SIM card processing units through port multiplexing, so that one SIM card can communicate with any SIM card processing unit.

[0046] The DBB (Digital Baseband Chip) includes multiple central processing units (CPUs) and digital signal processing unit...

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Abstract

The invention discloses a multi-mode terminal and a switching method for the multi-mode terminal, comprising: a power management chip, a digital baseband chip, a first radio frequency chip, a second radio frequency chip, a first card holder, a second card holder, and a first clock source and a second clock source, wherein: the power management chip is connected with the digital baseband chip, the first card holder and the second card holder; the digital baseband chip is also connected with the first card holder and the second card holder, and is connected with the in-phase / quadrature The I / Q data line and the control line are respectively connected to the first radio frequency chip and the second radio frequency chip; the first clock source is connected to the first radio frequency chip to provide a reference clock for the first radio frequency chip; the second clock source is connected to the second radio frequency chip connected to provide a reference clock for the second radio frequency chip, a clock path is also connected between the first radio frequency chip and the second radio frequency chip, and the first radio frequency chip provides the output clock to the second radio frequency chip through the clock path, as the second radio frequency chip. The reference clock of the RF chip.

Description

technical field [0001] The invention relates to the field of terminal hardware, in particular to a multi-mode terminal and a switching method for the multi-mode terminal. Background technique [0002] At present, some telecom operators operate multiple networks of different standards. For example, China Unicom owns GSM (Global System for Mobile Communications) network and WCDMA (Wideband Code Division Multiple Access) network, and China Mobile owns GSM network, TD-SCDMA (Time Division Synchronous Code Division Multiple Access) network and TD-LTE (Time Division Long Term Evolution) network, etc. Currently, voice services on LTE networks use CSFB (Circuit Domain Fallback) technology to implement voice call functions. LTE terminals are required to fall back to GSM networks or other networks that can implement voice functions under LTE networks. This requires LTE terminals to support LTE mode and Other modes, and can support fast switching between LTE mode and other modes. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W8/18H04W88/06
CPCH04J3/0685H04B1/0064H04W88/06H04W36/34
Inventor 周正林
Owner ZTE CORP