KR100612682B1 - Method for Hand-over Between Asynchronous Communication Network and Synchronous Communication Network Using Low Power Mode of Multi Mode Multi Band Mobile Communication Terminal and Mobile Communication Terminal therefor - Google Patents

Abstract

Handover method between asynchronous and synchronous networks using low power state of multimode multiband mobile communication terminal to improve handover success rate from asynchronous mobile communication system to synchronous mobile communication system in asynchronous network and synchronous network To provide.

The present invention includes a first step of determining a handover condition; A second step of activating the synchronous modem unit of the mobile communication terminal and transitioning to a low power state in the standby mode when it is determined that the handover condition is determined in the first step, and entering the standby mode according to the handover triggering from the asynchronous mobile communication system. The handover is performed to the synchronous mobile communication system through the synchronous modem unit, which operates the synchronous modem unit when the mobile communication terminal located in the asynchronous network transmits and receives a low power state, and then performs the handover from the asynchronous network to the synchronous network. Because of this, there is an effect that can prevent the disconnection caused by handover.

Handover

Description

Method for Hand-over Between Asynchronous Communication Network and Synchronous Communication Network Using Low Power Mode of Multi Mode Multi Band Mobile Communication Terminal and Mobile Communication Terminal therefor}

1 is a configuration diagram of a mobile communication network to which the present invention is applied;

2 is a configuration diagram of a mobile communication terminal applied to the present invention;

3 is a flowchart illustrating an embodiment of a handover method between a synchronous network and an asynchronous network according to the present invention;

4 is a flowchart illustrating another embodiment of a handover method between a synchronous network and an asynchronous network according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: multi-mode multi-band mobile communication terminal 20: asynchronous mobile communication system

30: synchronous mobile communication system 40: Internet

110: antenna 120: asynchronous module

121, 131: duplexer 122: asynchronous wireless transceiver

123: asynchronous modem unit 124, 134: vocoder

130: synchronization module 132: synchronous wireless transceiver

133: synchronous modem unit 140: common module

210: Node B / wireless network controller 220: asynchronous switch

230, 330: No.7 common signal network

240, 340: short message service center 260, 360: home location register

270: SGSN 280: GPRS network

290: GGSN 310: base station / base station controller

320: switch 370: packet data service node

380 data core network

The present invention relates to a handover method between an asynchronous network and a synchronous network using a low power state of a multimode multiband mobile communication terminal, and more particularly, to reduce power consumption of a mobile communication terminal in a network in which an asynchronous network and a synchronous network are mixed. The present invention relates to a handover method between an asynchronous network and a synchronous network using a low power state of a multimode multiband mobile communication terminal for minimizing and improving the handover success rate from an asynchronous mobile communication system to a synchronous mobile communication system. .

With the development of mobile communication technology and the evolution of communication networks, various types of mobile communication systems are being developed. Accordingly, the IMT-2000 system has been developed to solve the global roaming problem between mobile communication systems. IMT-2000 system is divided into CDMA 2000 based synchronous system and WCDMA based asynchronous system.

In addition, in order to support global roaming between mobile communication systems, a mobile communication terminal (Multi Mode Multi Band Mobile Communication Terminal) capable of being used in both a synchronous system and an asynchronous system has been developed. This allows different types of services to be used in each of the asynchronous system domain and the synchronous system domain.

Currently, asynchronous mobile communication systems are being built around regions with high service demands. Accordingly, synchronous mobile communication systems have evolved to include asynchronous service areas. When a mobile station moves between an asynchronous mobile communication system and a synchronous mobile communication system, handover between systems is required for continuous service provision.

However, since asynchronous mobile communication systems and synchronous mobile communication systems have different communication methods, it is very difficult to implement handover between systems, and the proposed handover scheme has a limitation in increasing the handover success rate. In addition, since the multi-mode multi-band mobile communication terminal also has two modems, it is very important to determine when to run and turn off the two modems.

When the multimode multiband mobile communication terminal performs handover in the boundary area of the asynchronous mobile communication system, it takes about 10 seconds to drive the synchronous modem after triggering the handover at the terminal. After driving the synchronous modem, the mobile communication terminal often moves to a place where the radio environment is not good, and thus the handover is often not performed.

In addition, when a handover from the asynchronous mobile communication system to the synchronous mobile communication system is performed earlier than necessary, the asynchronous modem unit and the synchronous modem unit are turned on at the same time. The disadvantage is that the power consumption increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and before operating a handover from an asynchronous mobile communication system to a synchronous mobile communication system, a synchronous modem of a mobile communication terminal is kept in a low power state and asynchronously moved. A technical problem is to provide a handover method between an asynchronous network and a synchronous network using a low power state of a multimode multiband mobile communication terminal capable of improving handover success rate as a handover is performed from a communication system to a synchronous mobile communication system. have.

The present invention for achieving the above object is a multi-mode multi-band mobile communication terminal capable of communicating with the asynchronous mobile communication system and the synchronous mobile communication system, performing a handover between the asynchronous mobile communication system and the synchronous mobile communication system,

An asynchronous modem unit for outputting a modem driving signal to drive a modem for transmitting and receiving a signal to and from the synchronous mobile communication system when a preset handover condition is met during communication with the asynchronous mobile communication system; A synchronous modem unit which is started in an off state and initializes according to a modem driving signal output from the asynchronous modem unit, and transitions to a low power state in a standby mode, wherein the standby state is triggered by handover triggering from an asynchronous mobile communication system A handover is performed to the synchronous mobile communication system through the synchronous modem unit in the mode.

Another embodiment of the present invention is capable of communicating with an asynchronous mobile communication system and a synchronous mobile communication system, and in a mobile communication network in which a handover cell of a predetermined size exists between the asynchronous mobile communication system and the synchronous mobile communication system, an asynchronous modem unit and a synchronous modem unit. A mobile communication terminal control method for handover of a multi-mode multi-band mobile communication terminal comprising:

A first step of determining a handover condition; In the first step, if it is determined that the handover condition, and including the second step of starting the synchronous modem unit of the mobile communication terminal and transition to the low power state of the standby mode, the mobile terminal according to the handover triggering from the asynchronous mobile communication system A handover is performed to the synchronous mobile communication system through the synchronous modem unit in the standby mode.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a mobile communication terminal refers to a multi-mode multi-band mobile communication terminal that can be used in both an asynchronous mobile communication system and a synchronous mobile communication system. The mobile communication terminal may be described as an example of driving the synchronous modem unit when entering the handover cell area and driving the synchronous modem unit when a call is transmitted from or received from a mobile communication terminal. , The detailed description will be described later.

1 is a block diagram of a mobile communication network to which the present invention is applied.

The multi-mode multiband mobile communication terminal 10 may use a voice and data service by wirelessly connecting the asynchronous mobile communication system 20 and the synchronous mobile communication system 30, respectively.

The asynchronous mobile communication system 20 is a wireless network controller (Node B / RNC, 210) for controlling Node B and Node B as a base station for wireless section communication with the mobile communication terminal 10, wireless network controller 210 Asynchronous exchange (MSC, 220), asynchronous exchange 220 and No. to perform a call exchange to provide a service to the mobile communication terminal 10 is connected to. 7 between the short message service center (SMSC, 240) and the home location register (HLR, 260), the wireless network controller 210 and the general packet radio service (GPRS) network 280 connected through a common signal network 230 Connected via the Serving Support Node (SGSN) 270, the SGSN 270, and the GPRS network 280, which maintains the location track of the mobile communication terminal 10 and performs access control and security functions, and is connected to the Internet 40. And a Gateway GPRS Support Node (GGSN) 290 connected to and supporting interworking with external packets.

In addition, the synchronous mobile communication system 30 is connected to the mobile communication terminal 10 and the base station controller (BTS / BSC, 310) for controlling the base station and the base station for supporting the wireless section communication, and connected to one or more base station controller to perform a call exchange A short message service center (SMSC, 340) and a home location register (HLR, 360), a base station controller, which are connected through an exchange (MSC) 320, an exchange 320, and a No. 7 common signaling network 330 to perform A packet data service node (PDSN) 370 connected to provide a packet data service to a subscriber, and a data core network (DCN) 380 for supporting a connection between the packet data service node 370 and the Internet 40; It is composed.

The switches 220 and 320 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 are interconnected by the No. 7 common signal networks 230 and 330, and the handover of the mobile communication terminal 10 is performed. Send and receive the necessary information. In addition, the home location registers 260 and 360 may be implemented as dual stack home location registers. The home location registers 260 and 360 may store and manage subscriber information, additional service usage, and the like, and provide subscriber information at the request of the exchange 220 or 320. .

2 is a block diagram of a mobile communication terminal applied to the present invention.

As shown, the multi-mode multi-band mobile communication terminal 10 applied to the present invention includes an antenna 110, a module 120 for asynchronous mobile communication service, a module 130 for synchronous mobile communication service and a common module. And 140.

In more detail, the antenna 110 may simultaneously process a frequency band for a synchronous mobile communication service and a frequency band for an asynchronous mobile communication service.

The asynchronous module 120 is a deplexer 121 that processes and operates by dividing each frequency, an asynchronous wireless transceiver 122 that separates transmission and reception radio waves into a predetermined frequency band, and processes an asynchronous mobile communication system and a wireless section protocol. An asynchronous modem unit 123 and a vocoder 124 for performing encryption and decryption of the voice signal, and the synchronization module 130 divides each frequency into a deplexer 131 that processes and operates and synchronizes. A synchronous modem unit 133 for processing a wireless section protocol with the mobile communication system and a vocoder 134 for encrypting and decrypting a voice signal.

Among the components of the asynchronous module 120, the asynchronous modem unit 123 enters the handover cell area or transmits and receives a call in the asynchronous network service area, and requests the synchronous modem unit 133 to drive the modem.

The synchronous modem unit 133 drives the modem by performing an initialization procedure of the modem and a preparation procedure for searching for a pilot channel of the synchronous mobile communication system 30 according to a modem driving request of the asynchronous modem unit 123, and a low power state. Keep it. Here, in the low power state of the synchronous modem unit 133, the power of the synchronous modem unit 133 is turned on, but the transmission and reception of information is stopped and the CPU operation of the modem unit is stopped, and the current consumption is 1 ㎃ to 1.5 ㎃ The current consumption is less than the idle state of. Here, it takes about one second for the synchronous modem unit 133 to transition from the low power state to the idle state.

The common module 140 includes an application processor, a memory, an input / output unit, other application processing units, etc. that operate as a central processing unit for controlling the asynchronous modem unit 123 and the synchronous modem unit 133 and perform multimedia functions.

In addition, the multi-mode multi-band mobile communication terminal 10 is equipped with software for the user interface, additional services, mobility management, access / session control, resource control, protocol processing, so that the user can use a variety of application services Handover is performed and protocol conversion is performed according to the mobile communication system.

The mobile communication terminal described above will be described as an example of driving the synchronous modem unit when entering the handover cell area and driving the synchronous modem unit when a call is transmitted from or received from a mobile communication terminal. And, a detailed description will be described later.

3 is a flowchart illustrating an embodiment of a handover method between a synchronous network and an asynchronous network according to the present invention, wherein when a call is sent from a multimode multiband mobile communication terminal located in an asynchronous network or a call is received from an asynchronous mobile communication system, A case where the synchronous modem unit 133 of the communication terminal 10 is driven will be described as an example.

When a call is sent from the mobile communication terminal 10 located in the service area of the asynchronous mobile communication system or a call is received from the asynchronous mobile communication system 20 (S101), the asynchronous modem unit 123 of the mobile communication terminal 10 is a synchronous modem. The unit 133 requests that the synchronous modem unit be driven (S103).

Accordingly, the synchronous modem unit 133 of the mobile communication terminal 10 is started to perform the initialization of the modem and the pilot channel of the synchronous mobile communication system 30 to perform initialization (S105).

After the synchronous modem unit 133 is started and initialized, the synchronous modem unit 133 transitions to a low power mode (S107). At this time, in the low power state of the synchronous modem unit 133, the power of the synchronous modem unit 133 is turned on, but the transmission and reception of information is stopped and the CPU operation of the modem unit is stopped, and current consumption is 1 ㎃ to 1.5 ㎃. The current consumption is less than the idle state. Here, it takes about one second for the synchronous modem unit 133 to transition from the low power state to the idle state.

As the mobile communication terminal 10 using the service of the asynchronous mobile communication system 20 moves to the service area of the synchronous mobile communication system 30 through the handover cell area, it is asynchronous with the asynchronous mobile communication system 20. The modem unit 123 performs a trigger for handover (S109).

The asynchronous modem unit 123 requests to transition to the synchronous modem unit 133 in the idle state through the common module 140 (S111), and requests a handover to the asynchronous mobile communication system 30 (S113). . At this time, the asynchronous modem unit 123 transmits the system information obtained from the base station of the asynchronous mobile communication system 20.

In response to the idle state transition request in step S111, the synchronous modem unit 133 searches for the pilot channel and the sync channel of the synchronous mobile communication system 30 (S115 and S117), and then transitions to the idle state (Idle state). (S119).

Subsequently, when the asynchronous mobile communication system 20 instructs the asynchronous modem unit 123 to perform a handover based on system information obtained from the base station of the asynchronous mobile communication system transmitted in step S113 (S121), asynchronously. The modem unit 123 requests a transition to the traffic state to the synchronous modem unit 133 through the common module 140 (S123).

Accordingly, the synchronous modem unit 133 performs initialization to transition to the traffic state (S125), and transmits reverse traffic to synchronize with the synchronous mobile communication system 30 (S127).

Subsequently, the synchronous modem unit 133 reports to the base station of the synchronous mobile communication system 30 that the handover is completed (S129), and then transmits the asynchronous modem 123 and the asynchronous vocoder 124 through the common module 140. The vocoder is switched by turning off and driving the synchronous vocoder 134 (S131).

After performing the handover from the asynchronous mobile communication system 20 to the synchronous mobile communication system 30, the synchronous modem unit 133 of the mobile communication terminal 10 satisfies the call connection state S101 before performing the handover. Keep it.

4 is a flowchart illustrating another embodiment of a handover method between a synchronous network and an asynchronous network according to the present invention, wherein a multimode multiband mobile communication terminal located in an asynchronous network moves to a handover cell area. An example of driving the synchronous modem unit 133 of FIG.

When the mobile communication terminal 10 enters the service area of the synchronous mobile communication system from the service area of the asynchronous mobile communication system, the asynchronous modem unit 123 of the mobile communication terminal 10 receives the system from the base station of the synchronous handover cell area. Information is obtained (S201), from which it is recognized that the handover cell area has been entered. Accordingly, the asynchronous modem unit 123 requests to drive the modem to the synchronous modem unit 133 through the common module 140 (S203).

Here, when the asynchronous modem unit 123 of the mobile communication terminal 10 enters the handover cell area, it requests to drive the synchronous modem unit 133 automatically.

Accordingly, the synchronous modem unit 133 of the mobile communication terminal 10 is started to perform the initialization of the modem and the pilot channel of the synchronous mobile communication system 30 to perform initialization (S205).

After the synchronous modem unit 133 is started and initialized, the synchronous modem unit 133 transitions to a low power mode (S207). At this time, in the low power state of the synchronous modem unit 133, the power of the synchronous modem unit 133 is turned on, but the transmission and reception of information is stopped and the CPU operation of the modem unit is stopped, and current consumption is 1 ㎃ to 1.5 ㎃. It is a low power state that consumes less current compared to the idle state. Here, it takes about one second for the synchronous modem unit 133 to transition from the low power state to the idle state.

As the mobile communication terminal 10 using the service of the asynchronous mobile communication system 20 moves to the service area of the synchronous mobile communication system 30 through the handover cell area, it is asynchronous with the asynchronous mobile communication system 20. The modem unit 123 performs a trigger for handover (S209).

The asynchronous modem unit 123 requests to transition to the synchronous modem unit 133 in the idle state through the common module 140 (S211), and requests a handover to the asynchronous mobile communication system 30 (S213). . At this time, the asynchronous modem unit 123 transmits the system information obtained from the base station of the asynchronous mobile communication system 20.

In response to the idle state transition request in step S211, the synchronous modem unit 133 searches for pilot channels and sync channels of the synchronous mobile communication system 30 (S215 and S217), and then transitions to an idle state (Idle state). (S219).

Thereafter, when the asynchronous mobile communication system 20 instructs the asynchronous modem unit 123 to perform handover based on system information obtained from the base station of the asynchronous mobile communication system transmitted in step S213 (S221). The modem unit 123 requests a transition to the traffic state to the synchronous modem unit 133 through the common module 140 (S223).

Accordingly, the synchronous modem unit 133 initializes to transition to the traffic state (S225), and transmits reverse traffic to synchronize with the synchronous mobile communication system 30 (S227).

Subsequently, the synchronous modem unit 133 reports to the base station of the synchronous mobile communication system 30 that the handover is completed (S229), and then transmits the asynchronous modem 123 and the asynchronous vocoder 124 through the common module 140. The vocoder is switched by turning off and driving the synchronous vocoder 134 (S231).

After step S231, the synchronous modem unit 133 maintains an idle state.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

 As described above, the handover method between the asynchronous network and the synchronous network using the low power state of the multimode multiband mobile communication terminal of the present invention, and the mobile communication terminal for driving the synchronous modem unit when transmitting and receiving a call of the mobile communication terminal located in the asynchronous network Since the handover is performed from the asynchronous network to the synchronous network after maintaining the low power state, there is an effect of preventing the call disconnection that occurs during the handover.

In addition, since the mobile communication terminal of the present invention automatically drives the synchronous modem unit when the handover cell enters and maintains a low power state, there is an effect of improving the handover success rate from the asynchronous network to the synchronous network.

Claims (12)

A multimode multiband mobile communication terminal capable of communicating with an asynchronous mobile communication system and a synchronous mobile communication system, and performing handover between the asynchronous mobile communication system and the synchronous mobile communication system, An asynchronous modem unit for outputting a modem driving signal to drive a modem unit for transmitting / receiving a signal with the synchronous mobile communication system when a preset handover condition is established during communication with the asynchronous mobile communication system; And A synchronous modem unit which is started in an off state and initializes according to a modem driving signal output from the asynchronous modem unit and then transitions to a low power state in a standby mode; And performing a handover to the synchronous mobile communication system through the synchronous modem unit in the standby mode according to the handover triggering from the asynchronous mobile communication system. The method of claim 1, The asynchronous modem unit determines that the handover condition has been met by transmitting and receiving a signal to and from the asynchronous mobile communication system for call setup, and requesting the modem unit to be activated. The method of claim 2, The synchronous modem unit transmits and receives a signal to and from the synchronous mobile communication system after modem startup and handover is performed, and maintains the call setup state. The method of claim 1, When the mobile communication terminal enters a handover cell which is a boundary area between the asynchronous mobile communication system region and the synchronous mobile communication system region, the asynchronous modem unit requests the mobile terminal to start the modem unit. . The method of claim 4, wherein The synchronous modem unit maintains an idle state after starting a modem and performing a handover. The method of claim 1, The low power state of the synchronous modem unit, A mobile communication terminal characterized in that the power of the synchronous modem unit is turned on but the transmission and reception of information is stopped and the CPU operation of the synchronous modem unit is stopped. In a mobile communication network capable of communicating with an asynchronous mobile communication system and a synchronous mobile communication system, wherein a handover cell of a specified size exists between the asynchronous mobile communication system and the synchronous mobile communication system, a multimode including an asynchronous modem unit and a synchronous modem unit. A mobile communication terminal control method for handover of a multi-band mobile communication terminal, A first step of determining a handover condition; And A second step of starting a synchronous modem unit of the mobile communication terminal and transitioning to a low power state in a standby mode when it is determined that the handover condition is performed in the first step; And a handover to the synchronous mobile communication system through the synchronous modem unit in the standby mode according to the handover triggering from the asynchronous mobile communication system. Handover method between synchronization networks. The method of claim 7, wherein The first step is, When the asynchronous modem unit transmits and receives a signal with the asynchronous mobile communication system to set up a call, it is determined that a handover condition has been characterized in that the handover method between the asynchronous network and a synchronous network using a low power state of the mobile communication terminal. The method of claim 8, The synchronous modem unit transmits and receives a signal to and from the synchronous mobile communication system and maintains the call setup state after the modem is started and the handover is performed. The handover method between the asynchronous network and the synchronous network using the low power state of the mobile communication terminal . The method of claim 7, wherein The first step is, When the mobile terminal enters a handover cell which is a boundary area between the asynchronous mobile communication system area and the synchronous mobile communication system, the asynchronous modem unit determines that a handover condition has been reached. Handover method between asynchronous and synchronous networks. The method of claim 10, The synchronous modem unit maintains an idle state after starting a modem and performing a handover. The handover method between an asynchronous network and a synchronous network using a low power state of a mobile communication terminal. The method of claim 7, wherein The low power state of the synchronous modem unit, The handset method between the asynchronous network and the synchronous network using a low power state of the mobile communication terminal, characterized in that the power of the synchronous modem unit is turned on but the transmission and reception of information is stopped and the CPU operation of the synchronous modem unit is stopped.

Images