WO2012126197A1

WO2012126197A1 - Device for restoring download path of mobile treminal

Info

Publication number: WO2012126197A1
Application number: PCT/CN2011/074112
Authority: WO
Inventors: 周加品
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-03-18
Filing date: 2011-05-16
Publication date: 2012-09-27
Also published as: CN102111917B; CN102111917A

Abstract

The present invention discloses a device for restoring the download path of a mobile terminal, and the device includes a capacitor(23) and a switch circuit(24), wherein one end of the capacitor(23) is connected with a pin of the main chip(21) of the mobile terminal, and the other end is connected with the switch circuit(24); and the switch circuit(24) is serially connected between the main chip(24) of the mobile terminal and a download interface(22). The application of the present invention can realize the legal download purpose of legally downloading update software, thereby improving user experience, effectively preventing a hacker from illegally reading data from and downloading data to the mobile terminal, and better achieving the purpose of network locking.

Description

Device for restoring download path of mobile terminal

The present invention relates to security technologies in the field of communications, and more particularly to an apparatus for restoring a download path of a mobile terminal. Background technique

At present, the global mobile operators operate in the following modes: Free to provide users with mobile terminals such as mobile phones, users must abide by the agreement, and must use the operator's network within the specified time. In order to prevent the user of the operator A from entering the network of the operator B illegally within the specified time, the mobile terminal that the manufacturer is required to provide to the operator must be processed by the lock network technology, that is, one mobile terminal can only use one fixed carrier. The network provided.

In the initial lock network technology, operators adopted a machine-card integrated mode, such as: China Unicom used CDMA (Code Division Multiple Access) operation mode, for CDMA communication standard mobile terminals, because of it The card number has been burned to the mobile terminal at the factory, so it is no longer necessary to use the Universal Subscriber Identity Module (USIM) card. In this card-integrated mode, the card number of the mobile terminal is bundled with the corresponding operator, and there is no case where the user illegally enters the network of another operator. However, in this case, if the user needs to change the card number, the operator must re-burn the card number, thus causing inconvenience to the user. To this end, a lock network technology is proposed, which uses a mode of separation of the machine cards. At this time, it is necessary to add a lock network function to the mobile terminal, that is, the user uses the mobile terminal and the USIM card provided by the operator A free of charge. When the user uses the USIM card of the carrier B to place the mobile terminal provided by the operator A, the mobile terminal may prompt that the USIM card or the USIM card cannot be found. Wherein, the separation of the machine card means: the card number is burned in the USIM card, so that the user can retain the original card number when replacing the mobile terminal, and the same, the user can also It is convenient to replace the card number used by the mobile terminal, and even one-card dual-card or multi-card can be used to meet the needs of users.

At present, the existing lock network technology generally uses software encryption to carry out. However, no matter how powerful the algorithm of software encryption is, there will be loopholes, and if there are loopholes, it will be broken by hackers. In order to solve this problem, a technical solution is proposed. FIG. 1 is a schematic diagram of a protection circuit of the technical solution. As shown in FIG. 1, the protection circuit diagram includes: a first resistor 11, a second resistor 12, a triode 13, and a fuse 14. The specific implementation of the technical solution is as follows: Add a fuse module between the main chip of the mobile phone and the download interface, that is: the protection circuit shown in Figure 1, when the mobile phone is shipped, the fuse 14 in the fuse module is blown In order to disconnect the download channel between the main chip and the download interface. However, after the mobile phone is used, if the software needs to be updated, at this time, since the download channel between the main chip and the download interface has been disconnected, the software update cannot be performed, thereby affecting the user's use. Summary of the invention

In view of this, the main object of the present invention is to provide a device for restoring a download path of a mobile terminal, which can legally download update software after the download path of the mobile terminal is disconnected, thereby improving the user experience.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides an apparatus for restoring a download path of a mobile terminal, including: a main chip of the mobile terminal, and a download interface, the device further comprising: a capacitor, and a switch circuit;

One end of the capacitor is connected to the pin of the main chip of the mobile terminal, and the other end is connected to the switch circuit;

The switch circuit is serially connected between the main chip of the mobile terminal and the download interface.

In the above solution, the discharge duration of the capacitor is smaller than the length of time required to download the update software. In the above solution, the switch circuit comprises: a switch; the switch is: a field effect transistor, or a triode, or an analog switch, or a relay. The device for recovering the download path of the mobile terminal provided by the invention comprises: a capacitor and a switch circuit; one end of the capacitor is connected with the pin of the main chip of the mobile terminal, and the other end is connected with the switch circuit; the switch circuit is connected in series Between the chip and the download interface, when the download path of the mobile terminal is disconnected and the software needs to be updated, the main chip of the mobile terminal acquires a recovery instruction from the external device; the main chip of the mobile terminal controls the switch circuit to restore the main chip according to the recovery instruction. Download the connection between the interfaces, download the update software through the restored connection, thus achieving the purpose of legally downloading the update software and improving the user experience.

In addition, after the update software download is completed, the main chip of the mobile terminal outputs a control signal to the control interface connected to the switch circuit according to the disconnection instruction, and the trigger switch circuit disconnects the connection between the main chip of the mobile terminal and the download interface, thereby breaking Open the download path, thus further preventing the hacker from illegally reading the mobile terminal and downloading the data, thereby better achieving the purpose of the lock network. DRAWINGS

1 is a schematic diagram of a prior art protection circuit;

2 is a schematic diagram of a protection circuit and a circuit for restoring a mobile terminal download according to an embodiment of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The device for restoring the download path of the mobile terminal of the present invention, as shown in FIG. 2, the device includes: a main chip 21 of the mobile terminal, a download interface 22, a capacitor 23, and a switch circuit 24; wherein, one end of the capacitor 23 and the main end of the mobile terminal The pins of the chip 21 are connected, and the other end is connected to the switch circuit 24;

The switch circuit 24 is connected in series between the main chip 21 of the mobile terminal and the download interface 22.

The discharge duration of the capacitor 23 is greater than the length of time required to download the recovery command, and is far less than the length of time required to download the update software. Thus, illegal personnel are prevented from illegally downloading during the discharge duration of the capacitor. The switch circuit 24 includes a resistor and a switch, wherein one end of the resistor is connected to a control signal output pin of the main chip of the mobile terminal, and the other end is connected to the control end of the switch. The switch may be: a field effect transistor (FET) , Field Effect Transistor ), or triode, or analog switch, or relay.

The device for restoring the download path of the mobile terminal provided by the present invention, when the download path of the mobile terminal is disconnected and the software needs to be updated, after the mobile terminal adds the battery, the pin of the main chip of the mobile terminal immediately has a voltage output, thereby causing the capacitor to be charged. After the charging is completed, the discharge starts, and the trigger switch circuit turns on the connection between the main chip of the mobile terminal and the download interface, so that the download path is connected, and then the main chip of the mobile terminal downloads the resume instruction from the external device, thereby obtaining a recovery instruction;

The main chip of the mobile terminal outputs a control signal to the control interface connected to the switch circuit according to the resume command, and the trigger switch circuit turns on the connection between the main chip of the mobile terminal and the download interface, and downloads the update software through the restored connection;

After downloading the update software, the main chip of the mobile terminal outputs a control signal to the control interface connected to the switch circuit according to the disconnection command, to trigger the switch circuit to disconnect the connection between the main chip of the mobile terminal and the download interface, thereby breaking Open the download path of the mobile terminal.

The external device may specifically be a personal computer (PC, Personal Computer) or the like.

Here, although the power supply provided by the main chip of the mobile terminal charges the capacitor, the discharge starts after the charging is completed, and the trigger switch circuit turns on the connection between the main chip of the mobile terminal and the download interface, so that the download path is connected. However, the download path will be connected for a short period of time, which is not enough to download the update software. Therefore, before downloading the update software, you need to use the recovery command to connect the recovery download circuit first, so that the download path is connected, ie: download interface and mobile The path between the main chips of the terminal is connected, and the update software is downloaded after being connected; wherein the recovery command is only owned by the manufacturer and the operator of the mobile terminal, so that illegal downloading can be further avoided; the update software downloaded by the mobile terminal includes the disconnection command. . When the update software is downloaded, the mobile terminal is in a shutdown state. When the mobile terminal is added with a battery, the main chip of the mobile terminal is in a working state, that is, the BOOT area is started, and corresponding configuration operations are performed, in order to prevent illegal personnel from acquiring a recovery instruction, the mobile terminal The main chip needs to download the recovery instruction to the BOOT area to obtain the recovery instruction. The specific processing procedure of the main chip of the mobile terminal for performing the corresponding configuration operation is exactly the same as the existing processing process, and details are not described herein again.

In practical applications, the manufacturer and operator of the mobile terminal can know the charging duration and the discharging duration of the capacitor according to the specifications of the capacitor, and accordingly, when the main chip of the mobile terminal is controlled to download the recovery command.

2 is a schematic diagram of a protection circuit and a circuit for restoring a mobile terminal download according to an embodiment of the present invention. As shown in FIG. 2, the implementation of the protection circuit belongs to the prior art, and the protection circuit is composed of a first resistor 11, a second resistor 12, and a triode. 13 and a fuse 14 are formed; wherein the fuse 14 is provided with a fuse current value.

The switching circuit 24 in this embodiment includes: a third resistor 241, a fourth resistor 242, and an N-Mental-Oxide-Semiconductor tube 243. The RXEN is one of the control interfaces of the main chip 21 of the mobile terminal, and the VIO is one of the power supplies provided by the main chip 21 of the mobile terminal. Here, it should be noted that the control interface of the main chip 21 of the mobile terminal is not limited. The RXEN may be any one of the control interfaces of the main chip 21 of the mobile terminal, and the power supplied from the main chip 21 of the mobile terminal is not limited to VIO, and may be any one of the power supplies provided by the main chip 21 of the mobile terminal.

As shown in FIG. 2, one end of the capacitor 23 is connected to the VIO, and the other end of the capacitor 23 is connected to one end of the third resistor 241 and the fourth resistor 242, respectively, and the capacitor 23, the third resistor 241, and the fourth resistor 242 are connected. The connection point is connected to RXEN, the other end of the third resistor 241 is connected to the gate of the NMOS transistor 243, the other end of the fourth resistor 242 is grounded, the source of the NMOS transistor 243 is connected to the point A, and the NMOS transistor 243 is connected. The drain is connected to point B; wherein RXEN is used to control the source-to-drain path of the NMOS transistor 243, specifically, when the RXEN output When the logic level is high, the source-to-drain path of the NMOS transistor 243 is turned on, and when RXEN outputs a logic low level, the source-to-drain path of the NMOS transistor 243 is turned off.

Here, it should be understood that when the switch is a triode, a field effect transistor other than the NMOS transistor, an analog switch, or a relay, etc., the specific connection of the switch to each component is a conventional technique of those skilled in the art.

The operation of the circuit provided by this embodiment will be described in detail below.

In order to prevent the hacker from reading data from the mobile terminal and downloading the cracked lock network data to the mobile terminal, the fuse 14 can be blown after the mobile terminal production test is completed. Here, the specific processing of the blown fuse 14 is prior art and will not be described herein.

After the mobile terminal is sold, when it is necessary to download the software when updating the software or repairing, the downloading of the update software is performed by the capacitor 23 and the switch circuit 24 for recovering the download path of the mobile terminal.

Assume that the PC has a recovery command M, which is used to make the RXEN output logic high, that is, to connect the download path.

The specific process of the recovery command M connecting the download path is as follows: When the mobile terminal adds the battery, the VIO immediately has a voltage output, so that the capacitor 23 is charged first, and after the charging is completed, the discharge starts, and the trigger switch circuit 24 turns on the main chip 21 of the mobile terminal. The connection with the download interface 22 is such that the download path is connected, and then the recovery command M is sent from the PC to the main chip 21 of the mobile terminal through the download interface 22 and the NMOS transistor 243, and then transmitted to the BOOT area of the mobile terminal; At this time, since the power source used for the communication of the download path is provided by the capacitor 23, assuming that the discharge time of the capacitor 23 is T1, T1 is required to be longer than the time required to download the resume command M, and in order to prevent the illegal person from updating within the T1 time period. The download of the software requires that T1 be much smaller than the length of time required to download the update software. In practical applications, the download recovery command has a duration of about 5 seconds. Therefore, the discharge time of the capacitor 23 must be greater than 5 seconds. Accordingly, the capacitance of the capacitor 23 can be selected to be 47 μΡ. At this time, the discharge duration of the capacitor 23 is It is about 10 seconds. When the resume command M is downloaded to the mobile terminal, RXEN will always output a logic high level, so that the source-to-drain path of the NMOS transistor 243 is opened, so that the download path is always in a connected state, and then the update can be performed from the PC. After the software download is completed, the main chip 21 of the mobile terminal re-sets the RXEN to a logic low state according to the disconnection instruction included in the updated software, so that the source of the NMOS transistor 243 is drained. The pole path is closed, thereby disconnecting the download path of the mobile terminal.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A device for restoring a download path of a mobile terminal, comprising: a main chip of the mobile terminal, and a download interface, wherein the device further comprises: a capacitor, and a switch circuit; wherein, one end of the capacitor and the main chip of the mobile terminal The pins are connected and the other end is connected to the switch circuit.

2. Apparatus according to claim 1 wherein the discharge time of the capacitor is less than the length of time required to download the update software.

3. Apparatus according to claim 1 or 2, wherein said switching circuit comprises: a switch; said switch being: a field effect transistor, or a triode, or an analog switch, or a relay.