CN1910834B - Method for controlling multi-mode multi-band mobile communication terminal for hand-over between asynchronous communication network and synchronous communication network and mobile communication syste - Google Patents

Abstract

The present invention relates to a method of controlling communication terminal and mobile communication system therefor. In the mobile communication terminal control method, a synchronous base station of a synchronous area placed at the boundary region of an asynchronous area transmits a dummy pilot signal at the same frequency as that of a signal used in the asynchronous mobile communication system and drives a modem unit of the mobile communication terminal moving from the asynchronous area to the synchronous area. A handover cell is constructed at the boundary between synchronous and asynchronous areas, and a handover base station in the handover cell transmits a signal including system information at the same frequency as that of a signal used in the asynchronous mobile communication system, thus driving the synchronous modem unit of the mobile communication terminal entering the handover cell.

Description

Method for controlling multi-mode multi-frequency mobile communication terminal to switch between asynchronous communication network and synchronous communication network and mobile communication system thereof

technical field

In general, the present invention relates to a method of controlling a mobile communication terminal, and in particular, to a method of controlling a mobile communication terminal and a mobile communication system thereof, the system and method utilizing and The asynchronous signal has the same frequency as the signal to drive the modem of the multi-mode multi-frequency mobile communication terminal.

Background technique

With the development of mobile communication technology and the advancement of communication networks, various types of mobile communication systems have been developed. Also, in order to solve the problem of global roaming among a plurality of mobile communication systems due to the development of various types of mobile communication systems, an International Mobile Telecommunications (IMT)-2000 system has been developed. The IMT-2000 system can be classified into a code division multiple access (CDMA) 2000 based synchronous mode system and a wideband CDMA (WCDMA) based asynchronous mode system.

In addition, in order to support global roaming between multiple mobile communication systems, mobile communication terminals (multi-mode multi-frequency terminals) that can be used in synchronous and asynchronous mode systems have also been developed. With such a mobile communication terminal, different types of services can be used in the asynchronous mode system area and the isochronous mode system area.

Currently, an asynchronous mobile communication system is constructed in an area with a large number of service requests, so that a synchronous mode mobile communication system has developed into a form whose service area includes that of the asynchronous mode system. During this process, when a user moves between an asynchronous mobile communication system and a synchronous mobile communication system, it is necessary to switch between these systems in order to provide continuous services.

For handover from the asynchronous mobile communication system to the synchronous mobile communication system, it is very important to efficiently detect the signal of the synchronous mobile communication system during the service provided by the asynchronous mobile communication system. For this operation, in order to perform handover, the multi-mode multi-frequency mobile communication terminal must drive the modem to interface with the synchronous mobile communication system while using the service provided by the asynchronous mobile communication system, and must search for a modem to be handed over therein. district.

However, since asynchronous and synchronous mobile communication systems use different communication methods, it is difficult to implement handover between the systems, and there are limitations in improving the probability of successful handover only by using the handover methods that have been proposed. In addition, since the multi-mode multi-frequency mobile communication terminal has two modems, it is extremely important to determine the time points when the two modems are driven and turned off.

Specifically, the multi-mode multi-frequency mobile communication terminal needs to switch during the service provided by the asynchronous mobile communication system, it takes about 10 seconds to drive the synchronous modem unit that communicates with the synchronous mobile communication system, and must communicate with the asynchronous The synchronous modem unit is driven before the communication of the mobile communication system is interrupted. This has the disadvantage that if the synchronous modem unit is not driven before the multimode multifrequency mobile communication terminal completely leaves the area of the asynchronous mobile communication system, handover cannot be successfully performed and the call will be interrupted, and if the synchronous modem unit is unnecessarily If ground is driven ahead of time, both modems are turned on at the same time, increasing power consumption. Thus, since the point in time at which the synchronous modem unit will be driven cannot be known exactly, problems such as interruption of communication at the time of switching and increase in power consumption arise.

As described above, the research on the method for controlling the multi-mode multi-frequency mobile communication terminal at the time of handover is not enough, so there are some disadvantages, that is, when handing over from the asynchronous mobile communication system to the synchronous mobile communication system, It is difficult to provide continuous service, and the time required for switching is greatly increased.

Contents of the invention

Therefore, the present invention is proposed in view of the above-mentioned problems, and the object of the present invention is to provide a method for controlling a multi-mode multi-frequency mobile communication terminal and a mobile communication system thereof, wherein switching occurs between an asynchronous mobile communication system and a synchronous mobile communication system At this time, the method and system drive the synchronous modems of the multi-mode multi-frequency mobile communication terminal with signals having the same frequency as those used in the asynchronous mobile communication system, thereby preventing communication interruption during handover and thereby providing continuous service.

Description of drawings

Fig. 1 shows the configuration of the mobile communication network to which the present invention is applied;

Fig. 2 shows the structure that is applied to the mobile communication terminal of the present invention;

3 shows a method for controlling a mobile communication terminal utilizing a dummy pilot (dummy pilot) signal in a mobile communication network where asynchronous and synchronous networks coexist;

Fig. 4 shows the variation of pseudo-pilot signal strength along with the movement of mobile communication terminal;

5 is a flowchart of a method for controlling a mobile communication terminal according to a first embodiment of the present invention;

6 is a flowchart of a method for controlling a mobile communication terminal according to a second embodiment of the present invention;

7 shows a method for controlling a mobile communication terminal by switching cells in a mobile communication network where synchronous and asynchronous networks coexist;

8 is a flowchart of a method for controlling a mobile communication terminal according to a third embodiment of the present invention;

FIG. 9 is a flowchart of a method for controlling a mobile communication terminal according to a fourth embodiment of the present invention.

Detailed ways

In order to achieve the above object, the present invention provides a method for controlling a multi-mode multi-frequency mobile communication terminal to switch, the multi-mode multi-frequency mobile communication terminal is equipped with an asynchronous modem unit and a synchronous modem unit, and the In a co-existing mobile communication network, the terminal can receive a signal from a synchronous mobile communication system during use of a service provided by the asynchronous mobile communication system. This method includes a first step: when using the service provided by the asynchronous mobile communication system When the mobile communication terminal moves into a synchronous area, the asynchronous modem unit of the mobile communication terminal receives a pseudo-pilot signal from a synchronous mobile communication system, drives the synchronous modem unit of the mobile communication terminal, and searches for a handover to be performed therein cell, will search the search result of the cell in which handover will be performed to notify the asynchronous mobile communication system, when receiving a handover command from the asynchronous mobile communication system, send a channel allocation message to the synchronous modem unit; the second step: switch the vocoder And close the asynchronous modem unit; the third step: the synchronous modem unit realizes synchronization with the synchronous mobile communication system.

Furthermore, the present invention provides a method for controlling handover of a multimode multifrequency mobile communication terminal equipped with an asynchronous modem unit and a synchronous modem unit and coexisting in an asynchronous and synchronous mobile communication system, and A handover cell having a preset size is located in the mobile communication network in the border area between the areas of the asynchronous and synchronous mobile communication systems, the terminal is capable of receiving signals from the synchronous mobile communication system during the use of services provided by the asynchronous mobile communication system, This method comprises a first step: when said mobile communication terminal using a service provided by an asynchronous mobile communication system moves through a handover cell area into a synchronous area, the asynchronous modem unit of said mobile communication terminal obtains a mobile communication terminal from this handover cell area The system information sent by the switching base station in the mobile communication terminal drives the synchronous modem unit of the mobile communication terminal, and requests the asynchronous mobile communication system to perform switching; the second step: the mobile communication terminal drives the synchronous modem unit and changes to an idle state; the second step Three steps: when receiving a switching command from the asynchronous mobile communication system, the asynchronous modem unit of the mobile communication terminal sends a channel allocation message to the synchronous modem unit; the fourth step: the mobile communication terminal closes the asynchronous modem unit and switches the vocoder; And the fifth step: the synchronous modem unit realizes the synchronization with the synchronous mobile communication system.

In addition, the present invention provides a mobile communication system, comprising: a synchronous mobile communication network; an asynchronous mobile communication network, which overlaps with the synchronous mobile communication network; and a handover cell, which is located in the synchronous mobile communication system and the asynchronous mobile communication system at the boundary between and is equipped with a handover base station for transmitting a signal having the same frequency as that used by an asynchronous mobile communication system, wherein the mobile communication system operates in the following manner: when a multimode When a multi-frequency mobile communication terminal moves from an asynchronous mobile communication network area through a handover cell area into a synchronous mobile communication network area, the mobile communication terminal receives a signal transmitted from the handover base station, thereby performing handover.

Hereinafter, 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-frequency mobile communication terminal that can be used in asynchronous and synchronous mobile communication systems. These mobile communication terminals can be classified into terminals capable of receiving signals from the synchronous mobile communication system using a synchronous modem unit during use of services provided by the asynchronous mobile communication system, and during use of services provided by the asynchronous mobile communication system, A terminal capable of transmitting signals to and receiving signals from a synchronous mobile communication system using a synchronous modem unit. It will be introduced in detail later.

FIG. 1 shows the configuration of a mobile communication network to which the present invention is applied.

The multi-mode multi-frequency mobile communication terminal 10 can selectively connect to the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 in a wireless manner, and use voice and data services.

The asynchronous mobile communication system 20 includes: a node B/RNC 210 composed of a node B (Node B) and a radio network controller (RNC), wherein the node B is a base station communicating with the mobile communication terminal 10 in the wireless area, and the RNC is used for Control Node B; Asynchronous Mobile Switching Center (MSC) 220, which is connected to Node B/RNC 210 to perform call switching, thereby providing service to mobile communication terminal 10; Short Message Service Center (SMSC) 240, which passes No. 7 public signal Let network 230 be connected to asynchronous MSC 220; Service Control Point (SCP) 250; Home Location Register (HLR) 260; Between network 280, be used for maintaining the location tracking of mobile communication terminal 10 and carry out access control and safety function; And gateway GPRS support node (GGSN) 290, it is connected to SGSN 270 through GPRS network 280, and is connected to No. 7 common signal The network 230 is configured to support interoperability with external groups via the Internet 40.

In addition, the synchronous mobile communication system 30 includes: a base transceiver station system (BTS)/base station controller (BSC) 310, which is composed of a base transceiver station for supporting communication with the mobile communication terminal 10 in a wireless area. System (BTS) and base station controller (BSC) for controlling the BTS; MSC 320, which is connected to one or more BSCs to perform call switching; SMSC 340, which is connected to MSC 320 through No. 7 public signaling network 330 ; SCP 350; HLR 360; Packet Data Serving Node (PDSN) 370, which is connected to the BSC to provide packet data services to subscribers;

The MSC 220 of the asynchronous mobile communication system 20 and the MSC 320 of the synchronous mobile communication system 30 are connected to each other through No. 7 public signaling networks 230 and 330, and transmit and receive information required for the handover of the mobile communication terminal 10. In addition, HLR 260 and 360 can be realized with dual-stack HLR, store and manage user information, use state of supplementary service etc., and provide user information according to the request of MSC 220 and 320.

In such a system environment, when mobile communication terminal 10 performing voice communication in an asynchronous mobile communication system area moves to a synchronous mobile communication system area, mobile communication terminal 10 detects an asynchronous signal transmitted from synchronous mobile communication system 30 . If the asynchronous signal transmitted from the synchronous mobile communication system 30 increases above a preset threshold value, the mobile communication terminal starts communicating with the synchronous mobile communication system. In this case, using a base station of a synchronous mobile communication system located at the boundary of an asynchronous mobile communication system area, or using a handover base station constructed in a handover cell additionally realized at a boundary between asynchronous and synchronous mobile communication system areas, it is possible to The asynchronous signal transmitted from the synchronous mobile communication system 30 is transmitted.

FIG. 2 shows the structure of a mobile communication terminal applied to the present invention.

As shown in FIG. 2 , the multi-mode and multi-frequency mobile communication terminal 10 applied to the present invention includes: an antenna 110 , an asynchronous mobile communication service module 120 , a synchronous mobile communication service module 130 and a common module 140 . The antenna 110 is capable of simultaneously handling frequency bands of synchronous and asynchronous mobile communication services.

The asynchronous module 120 includes: a duplexer 121 that functions as a bandpass filter that separately processes individual frequencies; an asynchronous wireless transmission/reception unit 122 that separates transmitted/received radio waves into preset frequency bands; an asynchronous modem unit 123 , for processing the wireless section protocol (wireless section protocol) of the asynchronous mobile communication system, and the vocoder 124, for performing encryption and decryption on voice signals. The synchronization module 130 includes: a duplexer 131 used as a band-pass filter for separately processing individual frequencies; a synchronous wireless transmission/reception unit 132 for separating transmission/reception radio waves into preset frequency bands; a synchronous modem unit 133, A radio section protocol for processing a synchronous mobile communication system, and a vocoder 134 for performing encryption and decryption on voice signals.

The common module 140 includes: an application processor serving as a central processing unit for controlling the asynchronous modem unit 123 and the synchronous modem unit 133; an application processor for implementing multimedia functions; a memory; an input/output unit, and some other application processing unit.

In addition, in the multi-mode multi-frequency mobile communication terminal 10, software for user interface, auxiliary service, mobility management, connection/session control, resource control, and protocol processing is installed, thereby allowing users to use various application services, perform handover, and protocol conversion according to the mobile communication system.

The mobile communication terminal described above can be classified into a terminal capable of receiving signals from a synchronous mobile communication system during a service provided using an asynchronous mobile communication system, and a terminal capable of transmitting a signal to the synchronous mobile communication system during a service provided using the asynchronous mobile communication system and A terminal receiving signals from the synchronous mobile communication system. If the mobile communication terminal is able to send signals to and receive signals from the synchronous mobile communication system during the period of using the service provided by the asynchronous mobile communication system, compared with a mobile communication terminal that can only receive signals, such as duplex The configuration of the components of switches 121 and 131 will become somewhat complicated. Therefore, the design of these components must take into account the effects of signal interference and the like.

In the present invention, in order to control a multi-mode multi-frequency mobile communication terminal that performs handover from an asynchronous mobile communication system area to a synchronous mobile communication system area, a signal having the same frequency as that used in the asynchronous area is transmitted to the synchronous mobile communication Mobile communication terminals in the system area. In order to realize this operation, a method of making a synchronous base station located at the boundary of an asynchronous area transmit a dummy pilot signal having the same frequency as the asynchronous signal, or a method of additionally constructing a handover cell area at the boundary area between the asynchronous and synchronous areas Methods.

First, a method of controlling a mobile communication terminal by causing a synchronous base station located at a boundary of an asynchronous area to transmit a dummy pilot signal is described below with reference to FIGS. 3 to 6 .

FIG. 3 shows a method for controlling a mobile communication terminal using a pseudo-pilot signal in a mobile communication network where asynchronous and synchronous networks coexist.

In a single mobile communication system, "handover" (or "handover") refers to a technique that allows a user to communicate without interruption when a mobile communication terminal moves from one cell of the mobile communication system to another of its cells .

The invention relates to a terminal control method for handover of multi-mode and multi-frequency mobile communication terminals in a network where synchronous and asynchronous mobile communication systems coexist. In both cases where the mobile communication terminal 10 moves from the synchronous area B to the asynchronous area A, and where the mobile communication terminal 10 moves from the asynchronous area A to the synchronous area B, the latter case will be described in detail.

When the mobile communication terminal 10 using the service of the asynchronous area A approaches the synchronous area B, the mobile communication terminal 10 receives a pseudo pilot signal transmitted from a base station of the synchronous mobile communication system. Since the pseudo pilot signal has the same frequency as the signal used in the asynchronous mobile communication system, the mobile communication terminal 10 with the activated asynchronous modem unit can easily detect the signal transmitted from the base station of the synchronous mobile communication system.

Fig. 4 shows the variation curve of the strength of the pseudo-pilot signal along with the movement of the mobile communication terminal.

It can be seen that when the mobile communication terminal moves into the synchronous area, the strength of the signal S1 received from the asynchronous mobile communication system gradually weakens, while the strength of the pseudo-pilot signal S2 received from the base station of the synchronous mobile communication system gradually increases . Thus, if the strength of the pseudo-pilot signal S2 gradually increases to exceed the preset threshold value T, the mobile communication terminal turns on the synchronous modem unit to communicate with the synchronous mobile communication system.

After turning on the synchronous modem unit, the mobile communication terminal searches for a base station of the synchronous mobile communication system, and notifies the asynchronous mobile communication system of a search result of searching for the base station via the asynchronous modem. Then, in response to a handover command from the asynchronous mobile communication system, a procedure for connecting with the synchronous mobile communication system is executed. This procedure can be divided into two operations and thus described in terms of two types of mobile communication terminals. That is to say, according to whether the mobile communication terminal is a terminal capable of receiving signals from a synchronous mobile communication system during use of a service provided by an asynchronous mobile communication system, or a terminal capable of moving to a synchronous mobile communication system during use of a service provided by an asynchronous mobile communication system A terminal that transmits a signal from the communication system and can also receive a signal from the synchronous mobile communication system controls the mobile communication terminal performing handover in a different manner.

5 is a flowchart of a method for controlling a mobile communication terminal according to a first embodiment of the present invention, which shows a mobile device capable of receiving a signal from a synchronous mobile communication system during a service provided by an asynchronous mobile communication system. In the case of a communication terminal, a method of controlling a mobile communication terminal using a dummy pilot signal.

In step S100, when a mobile communication terminal providing services using an asynchronous mobile communication system moves to a synchronous area, an asynchronous modem unit of the mobile communication terminal receives a dummy pilot signal from a synchronous mobile communication system. In this case, since the pseudo pilot signal has the same frequency as a signal used in the asynchronous mobile communication system, the asynchronous modem unit of the mobile communication terminal can easily detect the pseudo pilot signal.

In step S102, the asynchronous modem unit of the mobile communication terminal, after receiving the dummy pilot signal, sends a message to the synchronous modem unit to request to drive the synchronous modem. Therefore, in step S104, the synchronous modem unit executes the initialization procedure of the synchronous modem, and prepares to search the pilot channel of the synchronous mobile communication system. After the synchronous modem unit searches the pilot channel of the synchronous mobile communication system in step S106, the synchronous modem unit notifies the result of searching the pilot channel to the asynchronous modem unit in step S108, and the result of the pilot channel search is the Search results for cells of a synchronous mobile communication system in which handover is performed.

Therefore, in step S110, the asynchronous modem unit transmits the cell search result of the synchronous mobile communication system to the asynchronous mobile communication system. The asynchronous mobile communication system, after receiving the cell search result, determines whether to perform handover based on the cell search result, and determines the cell in which the handover is to be performed. Meanwhile, the synchronous modem unit searches for a synchronous channel of the synchronous mobile communication system in step S112, and changes to an idle state in step S114.

After that, in step S116, the asynchronous mobile communication system commands the asynchronous modem unit of the mobile communication terminal to perform handover, and in step S118, the asynchronous modem unit transmits a channel assignment message to the synchronous modem unit. In this case, the channel assignment message includes the parameters required to change the synchronous modem unit from the idle state to the traffic state.

In step S120, the synchronous modem unit, after receiving the channel allocation message, switches the vocoder, turns off the asynchronous modem unit, and changes to the service state in step S122. Next, in step S124, the synchronous modem unit transmits a reverse traffic signal to synchronize with the synchronous mobile communication system, and notifies that the handover of the base station of the synchronous mobile communication system has been completed in step S126.

During the service provided by the asynchronous mobile communication system, the mobile communication terminal applied to this embodiment can only receive signals from the synchronous mobile communication system. Therefore, after the asynchronous modem unit is turned off, the synchronous modem unit must send reverse traffic signals.

6 is a flow chart of a method for controlling a mobile communication terminal according to a second embodiment of the present invention, which shows that the mobile communication terminal can transmit to the synchronous mobile communication system during the use of services provided by the asynchronous mobile communication system. In the case of receiving a signal and receiving a signal from a synchronous mobile communication system, a method of controlling a mobile communication terminal using a dummy pilot signal.

In this embodiment, from the procedure starting from causing the asynchronous modem unit to receive the dummy pilot signal, and driving the synchronous modem unit, to causing the asynchronous mobile communication system to send a switching command to the asynchronous modem unit, and causing the asynchronous modem unit to switch to the synchronous modem unit The procedure for sending the channel allocation message is the same as that of the mobile communication terminal control method described in FIG. 5 .

That is, in step 200, when a mobile communication terminal using a service provided by an asynchronous mobile communication system moves to a synchronous area, the asynchronous modem unit of the mobile communication terminal receives a pseudo pilot signal from the synchronous mobile communication system, and In step S202, the synchronous modem unit is requested to drive the synchronous modem.

Therefore, in step S204, the synchronous modem unit executes the initialization program of the synchronous modem, and prepares to search the pilot channel of the synchronous mobile communication system, searches the pilot channel of the synchronous mobile communication system in step S206, and notifies the asynchronous modem in step S208 The unit is about a search result of searching for a cell of a synchronous mobile communication system in which handover is to be performed.

Then, when the asynchronous modem unit transmits the search result of the cell of the synchronous mobile communication system to the asynchronous mobile communication system in step S210, the asynchronous mobile communication system determines whether to perform handover based on the cell search result, and determines the cell in which the handover is performed . Meanwhile, the synchronous modem unit searches for a synchronous channel of the synchronous mobile communication system in step S212, and changes to an idle state in step S214. If the asynchronous mobile communication system commands the asynchronous modem unit to perform handover in step S216, the asynchronous modem unit transmits a channel assignment message to the synchronous modem unit in step S218.

Next, the synchronous modem unit changes to a traffic state in step S220, and transmits a reverse traffic signal to synchronize with the synchronous mobile communication system in step S222. Next, the synchronous modem unit notifies that the base station switching of the synchronous mobile communication system has been completed in step S224, switches the vocoder and turns off the asynchronous modem in step S226.

A mobile communication terminal applied to the present embodiment has a function of transmitting a signal to a synchronous mobile communication system during use of a service provided by the asynchronous mobile communication system. Therefore, the mobile communication terminal must transmit a reverse traffic signal to the synchronous mobile communication system before turning off the asynchronous modem unit, thereby synchronizing with the synchronous mobile communication system. Furthermore, such a mobile communication terminal can provide improved service compared to a mobile communication terminal that can only receive signals from a synchronous mobile communication system during use of an asynchronous mobile communication service. That is, since such a mobile communication terminal, which can only receive signals from the synchronous mobile communication system during the use of the asynchronous mobile communication service, synchronizes with the synchronous mobile communication system after turning off the asynchronous modem unit, the time during which synchronization is performed is An interval of silence, whereby the sound quality degrades. On the contrary, since the mobile communication terminal capable of transmitting signals to and receiving signals from the synchronous mobile communication system during the use of the asynchronous mobile communication service turns off the asynchronous modem after synchronizing with the synchronous mobile communication system, there is little occurrence of silence interval. Next, referring to FIG. 7 to FIG. 9 , the method of constructing a handover cell in the boundary area between the asynchronous and synchronous areas and using the handover cell to control a mobile communication terminal is described.

For this embodiment, a handover cell area C must be constructed additionally at the border area between the asynchronous area A and the synchronous area B, and the handover cell includes the handover base station 410 . The handover base station 410 sends a signal to another mobile communication terminal located in the area of the handover cell to indicate that the mobile communication terminal is currently located in the handover cell. This signal includes system information and is transmitted at the same frequency as that used by the asynchronous mobile communication system.

Such a system information transmission signal includes a specific scrambling code for distinguishing cells (asynchronous cells and synchronous cells) that are different from each other. Preferably, 512 scrambling codes are used. In addition, the length of the handover cell area, i.e. the distance between the boundaries of the asynchronous and synchronous areas, is preferably calculated and constructed according to the following formula (1), which takes into account the moving speed of the mobile communication terminal:

S _HOCELL ＝v _MS * T _HO (1)

In this case, S _HOCELL is the size of the cell, that is, the distance between the asynchronous and synchronous areas, V _MS is the moving speed of the mobile communication terminal, T _HO is the time required for handover, and T _HO can be set to, for example, 10 ~20 seconds.

In this system environment, when the mobile communication terminal 10 in the area of the asynchronous mobile communication system moves into the area of the synchronous mobile communication system, the mobile communication terminal 10 receives a signal transmitted from the handover base station in the area of the handover cell, and according to this A signal drives the synchronous modem unit. In addition, the mobile communication terminal 10 requests the asynchronous mobile communication system to perform handover, thereby connecting with the synchronous mobile communication system.

In addition, the handover cell only accepts calls related to mobile communication terminals performing handover from an asynchronous network to a synchronous network, restricts outgoing calls to and from an asynchronous mobile communication system, and accepts calls from Incoming calls to a synchronous mobile communication system, and outgoing calls towards the synchronous mobile communication system, thereby preventing voice quality degradation.

FIG. 7 shows a method for controlling a mobile communication terminal by switching cells in a mobile communication network where asynchronous and synchronous networks coexist.

When the mobile communication terminal 10 using the service of the asynchronous area A moves into the synchronous area B, the mobile communication terminal 10 receives a signal transmitted from the switching cell area C. FIG. The signal transmitted from the base station BTS _HO 410 of the handover cell area C includes system information indicating that the mobile communication terminal 10 is currently located in the handover cell area C. FIG. After receiving this signal, the mobile communication terminal requests the asynchronous mobile communication system 20 to perform handover while driving the synchronous modem unit. The asynchronous mobile communication system 20 that has received the handover request must send a handover command.

As described above, the asynchronous mobile communication system 20 unconditionally commands handover in response to the request of the mobile communication terminal 10, thereby preventing the ping-pong phenomenon from occurring in the border area between the asynchronous and synchronous networks. Ping-pong refers to a phenomenon in which handover is repeatedly performed when power intensity at a border area between cells is frequently changed.

The mobile communication terminal 10 switches modems and vocoders, and performs switching together with the synchronous mobile communication system 30 in response to a switching command from the asynchronous mobile communication system 20 . After the handover with the synchronous mobile communication system 30 has been completed according to the type of the mobile communication terminal 10, the handover process of the modem and the vocoder is performed (during the use of the asynchronous mobile communication service, the mobile communication terminal can send signals to the synchronous mobile communication system and can receive signals from a synchronous mobile communication system).

FIG. 8 is a flow chart showing a method for controlling a mobile communication terminal according to a third embodiment of the present invention, which shows that during the use of services provided by the asynchronous mobile communication system, the mobile communication terminal can only communicate from the synchronous mobile communication system. When the system receives a signal, it is a method of controlling a mobile communication terminal by switching cells.

When the mobile communication terminal using the service provided by the asynchronous mobile communication system passes through the handover cell area, from the asynchronous area to the synchronous area, the asynchronous modem unit of the mobile communication terminal receives a message from the base station of the handover cell area in step S300. The message includes system information indicating that the mobile communication terminal is currently located in the handover cell area. In this case, the signal including the system information uses the same frequency as that used by the asynchronous mobile communication system.

The asynchronous modem unit of the mobile communication terminal that has received the system information from the base station in the handover cell area sends a message requesting to drive the synchronous modem to the synchronous modem unit in step S302, and sends a request handover message to the asynchronous mobile communication system in step S304 . The synchronous modem unit of the mobile communication terminal executes the initialization program of the synchronous modem in step S306, prepares to search the pilot channel of the synchronous mobile communication system, and searches the pilot channel and the synchronous channel of the synchronous mobile communication system in steps S308 and S310, and Change to idle state in step S312.

Then, in step S314, the asynchronous modem unit receives a handover command from the asynchronous mobile communication system, and sends a channel assignment message to the synchronous modem unit in step S316. In this case, the channel assignment message includes the parameters required to change the synchronous modem unit from the idle state to the traffic state. After receiving the channel assignment message, the synchronous modem unit turns off the asynchronous modem unit, and completes the vocoder switching by turning off the asynchronous vocoder and driving the synchronous vocoder in step S318. The synchronous modem unit changes to the service state in step S320. Next, the synchronous modem unit transmits a reverse traffic signal to synchronize with the synchronous mobile communication system in step S322, and notifies the base station of the synchronous mobile communication system that the handover has been completed in step S324.

The mobile communication terminal applied to this embodiment is a terminal that can only receive signals from the synchronous mobile communication system during the use of services provided by the asynchronous mobile communication system. Therefore, after the asynchronous modem unit is turned off, the synchronous modem unit must send reverse traffic signals.

9 shows a method for controlling a mobile communication terminal according to a fourth embodiment of the present invention, which shows that the mobile communication terminal can send signals to a synchronous mobile communication system during use of services provided by an asynchronous mobile communication system , and can receive signals from a synchronous mobile communication system, a method of controlling a mobile communication terminal by switching cells. In this embodiment, the asynchronous modem unit is allowed to acquire system information from the base station within the handover cell area, send a drive command to the synchronous modem unit, send a handover command to the asynchronous mobile communication system, and transfer from the asynchronous mobile communication system when the synchronous modem unit is driven The process of the system receiving the switching command and allowing the asynchronous modem unit to send the channel allocation message is the same as that shown in FIG. 8 .

That is, when a mobile communication terminal using a service provided by an asynchronous mobile communication system moves into a synchronous area through a handover cell area, the asynchronous modem unit of the mobile communication terminal obtains system information from a base station of the handover cell area in step S400. The asynchronous modem unit requests the synchronous modem unit to drive the synchronous modem in step S402, and requests the asynchronous mobile communication system to perform handover in step S404. In this case, the signal including system information uses the same frequency as that used by the asynchronous mobile communication system.

Thus, the synchronous modem unit executes the initialization procedure of the synchronous modem in step S406, and prepares to search the pilot channel of the synchronous mobile communication system, searches the pilot channel and the synchronous channel of the synchronous mobile communication system in steps S408 and S410, and Change to idle state in step S412. Then, if the asynchronous mobile communication system commands the asynchronous modem unit to perform handover in step S414, the asynchronous modem unit transmits a channel allocation message to the synchronous modem unit in step S416.

Next, the synchronous modem unit changes to a traffic state in step S418, and sends a reverse traffic signal in step S420 to synchronize with the synchronous mobile communication system. Then, the synchronous modem unit notifies the base station of the synchronous mobile communication system that the handover has been completed in step S422, turns off the asynchronous modem in step S424, and completes the vocoder handover by turning off the asynchronous vocoder and driving the synchronous vocoder.

Since the mobile communication terminal applied to this embodiment has the function of sending a signal to the synchronous mobile communication system during the use of the service provided by the asynchronous mobile communication system, the mobile communication terminal sends a reverse signal to the synchronous mobile communication system before the asynchronous modem unit is turned off. business signals, thereby synchronizing with a synchronous mobile communication system. This embodiment can provide improved service over a mobile communication terminal that can only receive signals from a synchronous mobile communication system during use of an asynchronous mobile communication service. That is, since the mobile communication terminal capable of receiving signals only from the synchronous mobile communication system during the use of the asynchronous mobile communication service synchronizes with the synchronous mobile communication system after turning off the asynchronous modem unit, the time during which synchronization is performed is one There is an interval of silence, which degrades the sound quality. On the contrary, since a mobile communication terminal capable of transmitting signals to and receiving signals from a synchronous mobile communication system during the use of an asynchronous mobile communication service turns off the asynchronous modem after synchronizing with the synchronous mobile communication system, there are very few Generate silence intervals.

As described above, those skilled in the art will understand that the present invention can be implemented in other embodiments without changing its technical gist or essential features. Accordingly, the above-described embodiments should be understood as being disclosed for purposes of illustration and not limitation. Those skilled in the art will understand that the scope of the present invention is defined by the following claims, rather than by the above-mentioned embodiments, and various modifications, additions obtained from the meaning and scope of these claims and their equivalent concepts And replacement, all belong to the scope of the present invention.

Industrial Applicability

As described above, the present invention facilitates searching for a cell of a synchronous mobile communication system in a mobile communication network where asynchronous and synchronous mobile communication systems coexist, and activating a synchronous modem unit using a dummy pilot signal, thereby being able to prevent communication interruption at handover, Provide continuous service, thereby improving service quality.

In addition, the present invention can construct a handover cell area with a preset size at the boundary area of the asynchronous and synchronous area, and activate synchronization by utilizing a system information message received from a base station of the handover cell area when a mobile communication terminal enters the handover cell area The handover is performed by the modem unit so that the mobile communication terminal has a time margin sufficient to move from the asynchronous area to the synchronous area.

As described above, when a mobile communication terminal moves from an asynchronous area to a synchronous area, it is possible to perform handover with a sufficient time margin, so that it is possible to prevent the phenomenon that the asynchronous modem is turned off before driving the synchronous modem, or to prevent synchronous and asynchronous modems from being simultaneously driven. And the phenomenon of causing unnecessary battery power consumption occurs.

Claims (13)

1. multimode multi-mode mobile communication terminal control method that is used to switch, described multimode multi-mode mobile communication terminal is equipped with asynchronous modem unit and synchronous modem unit, and in the mobile communications network of asynchronous and synchronous mobile communication system coexistence, described multimode multi-mode mobile communication terminal can use the viability that is provided by described asynchronous mobile communiation system, from described synchronous mobile communication system received signal, described method comprises:

First step, when the described mobile communication terminal shift-in retaining zone of the service that provides by described asynchronous mobile communiation system is provided, the described asynchronous modem unit of described mobile communication terminal receives dummy pilot signal from described synchronous mobile communication system, drive the sub-district that the described synchronous modem unit search of described mobile communication terminal will be carried out switching therein, described asynchronous modem unit notifies described asynchronous mobile communiation system about carrying out the Search Results of the sub-district of switching therein, and when when described asynchronous mobile communiation system is received switching command, to described synchronous modem unit channel assignment message;

Second step is switched vocoder and is closed described asynchronous modem unit; And

Third step, described synchronous modem unit realization is synchronous with described synchronous mobile communication system;

Wherein, the frequency that has of described dummy pilot signal is identical with the frequency of the signal that uses in described asynchronous mobile communiation system.

2. multimode multi-mode mobile communication terminal control method that is used to switch, described multimode multi-mode mobile communication terminal is equipped with asynchronous modem unit and synchronous modem unit, and in the mobile communications network of asynchronous and synchronous mobile communication system coexistence, described multimode multi-mode mobile communication terminal can use the viability that is provided by described asynchronous mobile communiation system, to described synchronous mobile communication system transmission signal and from described synchronous mobile communication system received signal, described method comprises:

First step, when the described mobile communication terminal shift-in retaining zone of the service that provides by described asynchronous mobile communiation system is provided, the described asynchronous modem unit of described mobile communication terminal receives dummy pilot signal from described synchronous mobile communication system, drive the sub-district that the described synchronous modem unit search of described mobile communication terminal will be carried out switching therein, described asynchronous modem unit notifies described asynchronous mobile communiation system about carrying out the Search Results of the sub-district of switching therein, and when when described asynchronous mobile communiation system is received switching command, to described synchronous modem unit channel assignment message;

Second step, described synchronous modem unit realization is synchronous with described synchronous mobile communication system; And

Third step switches vocoder and closes described asynchronous modem unit; The frequency that wherein said dummy pilot signal has is identical with the frequency of the signal that uses in described asynchronous mobile communiation system.

3. mobile communication terminal control method as claimed in claim 1 or 2, wherein said first step may further comprise the steps:

Described asynchronous modem unit receives described dummy pilot signal from the base station of described synchronous mobile communication system;

The described synchronous modem unit of described asynchronous modem unit request drives synchronous modem;

Described synchronous modem unit is carried out the initialize routine of described synchronous modem, and searches for the pilot channel of described synchronous mobile communication system;

Described synchronous modem unit is notified the Search Results of described asynchronous modem unit about pilot channel, and described Search Results is the described Search Results of the described sub-district of the described synchronous mobile communication system of search;

Described asynchronous modem unit sends the described Search Results of the described sub-district of described synchronous mobile communication system to described asynchronous mobile communiation system;

Described synchronous modem unit is searched for the synchronizing channel of described synchronous mobile communication system, and changes to idle condition; And

When the described asynchronous modem unit of described asynchronous mobile communiation system order was carried out switching, described asynchronous modem unit sent described channel assignment message to described synchronous modem unit.

4. mobile communication terminal control method as claimed in claim 1 or 2, wherein realize may further comprise the steps synchronously with described synchronous mobile communication system:

Described synchronous modem unit changes to service condition;

Described synchronous modem unit sends reverse traffic signal to the described base station of described synchronous mobile communication system; And

Described synchronous modem unit is notified described synchronous mobile communication system to switch and is finished.

5. multimode multi-mode mobile communication terminal control method that is used to switch, described multimode multi-mode mobile communication terminal is equipped with asynchronous modem unit and synchronous modem unit, and in the mobile communications network of the coexistence of asynchronous and synchronous mobile communication system and switching cell with preset size frontier district between asynchronous and synchronous mobile communication system is regional, described multimode multi-mode mobile communication terminal can use the viability that is provided by described asynchronous mobile communiation system, from described synchronous mobile communication system received signal, described method comprises:

First step, when the described mobile communication terminal that the service that is provided by described asynchronous mobile communiation system is provided passes the described synchronous mobile communication system of described handover cell area shift-in zone, the described asynchronous modem unit of described mobile communication terminal obtains the system information that the base station shifting from described handover cell area sends, drive the described synchronous modem unit of described mobile communication terminal, and ask described asynchronous mobile communiation system to carry out switching;

Second step, described mobile communication terminal drives described synchronous modem unit, and described synchronous modem unit changes to idle condition;

Third step, when when described asynchronous mobile communiation system is received switching command, the asynchronous modem unit of described mobile communication terminal is to described synchronous modem unit channel assignment message;

The 4th step, described mobile communication terminal is closed described asynchronous modem unit, and switches vocoder; And

The 5th step, described synchronous modem unit realization is synchronous with described synchronous mobile communication system;

Wherein the frequency that has of the described system information that is obtained from described base station shifting by described mobile communication terminal is identical with the frequency of using described asynchronous mobile communiation system.

6. multimode multi-mode mobile communication terminal control method that is used to switch, described multimode multi-mode mobile communication terminal is equipped with asynchronous modem unit and synchronous modem unit, and in asynchronous and synchronous mobile communication system coexistence, and in the mobile communications network of the frontier district of the switching cell with preset size between asynchronous and synchronous mobile communication system is regional, described multimode multi-mode mobile communication terminal can use the viability that is provided by described asynchronous mobile communiation system, send signal to described synchronous mobile communication system, and from described synchronous mobile communication system received signal, described method comprises:

First step, when the described mobile communication terminal that the service that is provided by described asynchronous mobile communiation system is provided passes the described synchronous mobile communication system of described handover cell area shift-in zone, the described asynchronous modem unit of described mobile communication terminal obtains the system information that the base station shifting from described handover cell area sends, drive the described synchronous modem unit of described mobile communication terminal, and ask described asynchronous mobile communiation system to carry out switching;

Second step, described mobile communication terminal drives described synchronous modem unit, and described synchronous modem unit changes to idle condition;

Third step, when when described asynchronous mobile communiation system is received switching command, the asynchronous modem unit of described mobile communication terminal is to described synchronous modem unit channel assignment message;

The 4th step, described synchronous modem unit realization is synchronous with described synchronous mobile communication system; And

The 5th step, described mobile communication terminal is closed described asynchronous modem unit, and switches vocoder;

Wherein the frequency that has of the described system information that is obtained from described base station shifting by described mobile communication terminal is identical with the frequency of using described asynchronous mobile communiation system.

7. mobile communication terminal control method as claimed in claim 6, the signal that wherein comprises the described system information that sends from described base station shifting comprises the scrambler that shows about the information of sub-district, described mobile communication terminal place.

8. as claim 5 or 6 described mobile communication terminal control methods, wherein said second step may further comprise the steps:

Described synchronous modem unit is carried out the initialize routine of described synchronous modem, and prepares the pilot channel of the described synchronous mobile communication system of search;

Described synchronous modem unit is searched for the described pilot channel and the synchronizing channel of described synchronous mobile communication system; And

Described synchronous modem unit changes to idle condition.

9. as claim 5 or 6 described mobile communication terminal control methods, wherein realize may further comprise the steps synchronously with described synchronous mobile communication system:

Described synchronous modem unit changes to service condition;

Described synchronous modem unit sends reverse traffic signal to the described base station of described synchronous mobile communication system; And

Described synchronous modem unit is notified described synchronous mobile communication system to switch and is finished.

10. as claim 5 or 6 described mobile communication terminal control methods, the size of wherein said switching cell is S _HOCELL=V _MS* T _HO, S wherein _HOCELLBe the size of described switching cell, V _MSBe the translational speed of described mobile communication terminal, T _HOIt is the needed time of described switching.

11. a mobile communication system comprises:

Synchronous mobile communication system;

Asynchronous mobile communiation system with described synchronous mobile communication system crossover; And

Switching cell, its boundary between synchronous mobile communication system and asynchronous mobile communiation system, and base station shifting is equipped with, this base station shifting is used for sending the signal with frequency identical with the frequency of using at described asynchronous mobile communiation system,

Wherein said mobile communication system is worked in the following manner, promptly, when the multimode multi-mode mobile communication terminal with asynchronous modem unit and synchronous modem unit passes described handover cell area from the asynchronous mobile communication network zone, then during shift-in synchronous mobile communication network area, described mobile communication terminal receives the signal that sends from described base station shifting, switches thereby carry out;

Wherein, described multimode multi-mode mobile communication terminal is used to drive from the signal of described base station shifting the synchronous modem unit of described multimode multi-mode mobile communication terminal.

12. mobile communication system as claimed in claim 11, wherein the described signal that sends from described base station shifting comprises the scrambler that is used to show about the information of sub-district, described mobile communication terminal place.

13. mobile communication system as claimed in claim 11, the size of wherein said switching cell are S _HOCELL=V _MS* T _HO, S wherein _HOCELLBe the size of described switching cell, V _MSBe the translational speed of described mobile communication terminal, T _HOIt is the needed time of described switching.

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