KR101080558B1 - Idle Handover Method Between Asynchronous Communication Network and Synchronous Communication Network - Google Patents

Abstract

The present invention relates to an idle handover method from an asynchronous network to a synchronous network when the signal strength received by the mobile communication terminal from the asynchronous mobile communication system is less than or equal to a preset value.

The present invention provides a first step of determining whether an asynchronous signal strength value is less than or equal to a first threshold value by measuring a signal from an asynchronous mobile communication system by an asynchronous modem unit of a mobile communication terminal; As a result of the first step, when the asynchronous signal strength value is less than or equal to the first threshold value, a second signal for checking whether the asynchronous signal strength value is less than or equal to the preset second threshold by measuring a signal from the asynchronous mobile communication system in real time. step; As a result of the second step, if the asynchronous signal strength value is less than or equal to the second threshold, the synchronous modem unit requests registration to connect with the synchronous mobile communication system according to a request transmitted from the asynchronous modem unit, and registration with the synchronous mobile communication system is performed. And a third step of switching from the asynchronous mode to the synchronous mode when the signal strength between the mobile communication terminal and the asynchronous mobile communication system located in the asynchronous network is rapidly lowered below a preset threshold. Since handover is performed, the paging loss can be reduced to a minimum.

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Description

Idle Handover Method Between Asynchronous Communication Network and Synchronous Communication Network}

1 is a view for explaining the concept of idle handover from asynchronous network to a synchronous network,

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

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

4 is a view for explaining the concept of idle handover from an asynchronous network to a synchronous network according to the present invention;

5 is a flowchart illustrating an idle handover method from an asynchronous network to a synchronous 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 250, 350: intelligent network controller

260, 360: Home Location Register 270: SGSN

280: GPRS network 290: GGSN

310: base station / base station controller 320: switchboard

370: packet data service node 380: data core network

The present invention relates to an idle handover method from an asynchronous network to a synchronous network. More specifically, when the signal strength received by the mobile communication terminal from the asynchronous mobile communication system is less than or equal to a preset value, the idle handover is performed to the synchronous network. The method relates to an idle handover from an asynchronous network to a synchronous network.

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 areas with high service demands. Accordingly, synchronous mobile communication systems have evolved to include service areas of asynchronous system. When a user moves between an asynchronous mobile communication system and a synchronous mobile communication system, idle handover between systems is required for continuous service provision.

FIG. 1 is a diagram illustrating a concept of idle handover from asynchronous network to a synchronous network. A mobile communication terminal will be described as an example in which asynchronous network and a synchronous network are located.

In the mobile communication terminal located in the asynchronous network, the signal strength received from the asynchronous mobile communication system is lowered below the preset threshold value THc, and this state (the state where the signal strength of the asynchronous mobile communication system is lower than or equal to the threshold value) is preset. If it continues for the time Hd, the mobile communication terminal performs idle handover to the synchronization network.

However, in the above method, when the signal strength received from the asynchronous mobile communication system is sharply lowered, a problem arises in that the mobile communication terminal cannot idle handover to the synchronous network quickly.

The present invention has been made to solve the above-described problem, and when the signal strength value received by the mobile communication terminal from the asynchronous mobile communication system is less than or equal to the preset idle handover threshold, the idle handover can be immediately performed by the synchronous network. There is a technical problem in providing an idle handover method from an asynchronous network to a synchronous network.

According to the present invention for achieving the above object, in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, a mobile communication terminal performing communication with the asynchronous mobile communication system is an idle hand. As an idle handover method from an asynchronous network to a synchronous network for overwriting,

A first step of determining whether an asynchronous signal strength value is equal to or less than a first threshold value by measuring a signal from the asynchronous mobile communication system by an asynchronous modem unit of the mobile communication terminal; As a result of the first step, when the asynchronous signal strength value is less than or equal to the first threshold value, the signal from the asynchronous mobile communication system is measured in real time to determine whether the asynchronous signal strength value is less than or equal to the preset second threshold value. A second step of doing; As a result of the second step, when the asynchronous signal strength value is less than or equal to the second threshold, the synchronous modem unit requests registration to access the synchronous mobile communication system according to a request transmitted from the asynchronous modem unit, and the synchronous When the registration is performed with the mobile communication system, a third step of switching from the asynchronous mode to the synchronous mode is included.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a mobile communication network according to the present invention.

The multi-mode multi-band mobile communication terminal (hereinafter referred to as a "mobile communication terminal") 10 may use voice and data services by wirelessly connecting to 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, and a wireless network controller 210. A short-circuit is connected to the asynchronous exchange (MSC) 220, the asynchronous exchange 220 and the No. 7 common signal network 230 to perform a call exchange for providing a service to the mobile communication terminal 10 Connection between message service center (SMSC) 240, intelligent network controller (SCP) 250 and home location register (HLR) 260, wireless network controller 210 and GPRS (General Packet Radio Service) network 280 Connected via a Serving Support Node (SGSN) 270, SGSN 270, and a General Packet Radio Service (GPRS) network 280, which maintains the location track of the mobile communication terminal 10 and performs access control and security functions. And a Gateway GPRS Support Node (GGSN) 290 connected to the Internet 40 to support 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, call exchange is connected to one or more base station controller A short message service center (SMSC) 340, an intelligent network controller (SCP) 350, which is connected through an exchange (MSC) 320, an exchange 320 and a No. 7 common signaling network 330 A home location register (HLR) 360 is connected to the base station controller to establish a connection between a packet data service node (PDSN) 370 and a packet data service node 370 and the Internet 40 to provide a packet data service to a subscriber. It is configured to include a data core network (DCN) 380 to support.

The switches 220 and 320 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 are interconnected by No. 7 common signal networks 230 and 330, and the idle handover of the mobile communication terminal 10 is performed. Information necessary for transmitting and receiving is transmitted. 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. .

3 is a configuration diagram of a mobile communication terminal according to the present invention, which will be described with reference to FIG. 4 for explaining an idle handover concept from an asynchronous network to a synchronous network.

As shown, the mobile communication terminal 10 applied to the present invention includes an antenna 110, a module 120 for an asynchronous mobile communication service, a module 130 for a synchronous mobile communication service and a common module 140. It is configured to include.

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 includes a duplexer 121 that operates as a band pass filter for separating and processing respective frequencies, an asynchronous wireless transceiver 122 for separating transmission and reception radio waves into a predetermined frequency band, and a wireless section with an asynchronous mobile communication system. A synchronous modem 130 for processing protocols and a vocoder 124 for performing encryption and decryption of voice signals, and the synchronization module 130 operates as a duplexer that operates as a band pass filter for classifying and processing respective frequencies. 131, a synchronous wireless transceiver 132 for separating transmission and reception radio waves into a predetermined frequency band, a synchronous modem unit 133 for processing a wireless section protocol with a synchronous mobile communication system, and for encrypting and decrypting a voice signal Vocoder 134.

The asynchronous modem unit 123 is a first signal strength (asynchronous signal strength) transmitted from the asynchronous mobile communication system 20 while performing communication with the asynchronous mobile communication system 20 is set in advance as shown in FIG. When lowered below the threshold value THc1, the modem driving request signal for driving the modem is transmitted to the synchronous modem unit 133 in a power off state. Here, when the mode of the synchronous modem unit 133 is a low power mode other than the power off, the asynchronous modem unit 123 transmits a request signal to the idle mode to the synchronous modem unit 133.

Hereinafter, after the asynchronous signal strength is lowered below the first threshold, the operation of the asynchronous modem unit 123 will be described in three cases.

First, after the asynchronous signal strength is lowered below the first threshold, the asynchronous modem unit 123 measures the asynchronous signal again in real time, and when the asynchronous signal strength is below the second threshold THc2, the asynchronous movement is performed. When the idle handover request signal is transmitted to the communication system 20 and a response thereto is received, the idle handover request signal to the synchronous network is transmitted to the synchronous modem unit 133. Here, the second threshold value refers to an asynchronous signal strength value in which a call with the asynchronous mobile communication system 20 cannot be performed and an idle handover must be immediately performed to a synchronous network.

Second, after the asynchronous signal strength is lowered below the first threshold value, the asynchronous modem unit 123 measures the asynchronous signal again in real time, and when the asynchronous signal strength is below the second threshold value THc2, the asynchronous signal strength The asynchronous signal is measured again for a preset second time period Hd2 from the time when the first threshold value Hd1 is less than or equal to the second threshold value. As a result, when the asynchronous signal strength is still less than or equal to the second threshold, the idle handover request signal is transmitted to the asynchronous mobile communication system 20 and the response is received. send. Here, the second time is a preset time to prevent unnecessary handover to the synchronous network when the asynchronous signal strength temporarily decreases rapidly.

Third, after the asynchronous signal strength is lowered below the first threshold, the asynchronous modem unit 123 measures the asynchronous signal again after a predetermined third time period Hd3 has elapsed, and the asynchronous signal strength is still the first threshold. When the value is less than the value, the idle handover request signal is transmitted to the asynchronous mobile communication system 20, and upon receiving the response, the synchronous modem unit 133 transmits the idle handover request signal to the synchronous network. Here, the first threshold value refers to an asynchronous signal strength value that communicates with the asynchronous mobile communication system 20 and the voice call is required to be ready to perform idle handover in a possible state or a synchronous network.

When the signal strength from the asynchronous mobile communication system 20 is less than or equal to the first threshold value, the synchronous modem unit 133 switches from the low power mode to the driving mode according to the instruction of the asynchronous modem unit 123.

In addition, when the synchronous modem unit 133 receives the idle handover request signal transmitted from the asynchronous modem unit 123, the synchronous modem unit 133 communicates with the synchronous mobile communication system 30 to perform idle handover to the synchronous network.

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 mobile communication terminal 10 is equipped with software for user interface, additional service, mobility management, access / session control, resource control, and protocol processing, so that the user can use various application services and perform idle handover. Performs protocol conversion according to the mobile communication system.

5 is a flowchart illustrating an idle handover method from an asynchronous network to a synchronous network according to the present invention.

When the mobile communication terminal 10 located in the asynchronous network measures the signal of the asynchronous mobile communication system 20 (S101), it checks whether the received asynchronous signal strength value is equal to or less than the first predetermined threshold value (S103). .

Here, the first threshold value refers to an asynchronous signal strength value that communicates with the asynchronous mobile communication system 20 and the voice call is required to be ready to perform idle handover in a possible state or a synchronous network.

When the signal strength value of the asynchronous mobile communication system is less than or equal to the first threshold in step S103, the synchronous modem unit 133 sets the modem according to the modem driving request signal transmitted from the asynchronous modem unit 123 of the mobile communication terminal 10. Drive (S105). Here, when the synchronous modem unit 133 is in the low power mode, the synchronous modem unit 133 switches to an idle state in response to a modem driving request transmitted from the asynchronous modem unit 123.

Thereafter, the mobile communication terminal 10 measures a signal from the asynchronous mobile communication system 20 in real time (S107), and checks whether the received signal strength value is equal to or less than a preset second threshold value (S109). Here, the second threshold value refers to an asynchronous signal strength value that is impossible to make a call through communication with the asynchronous mobile communication system 20 to immediately perform idle handover to the synchronous network.

When the asynchronous signal strength value is less than or equal to the second threshold in step S109, the asynchronous modem unit 123 transmits an idle handover request signal to the asynchronous mobile communication system 20 and receives a response thereto. Transmit an idle handover request signal to the synchronous network.

Subsequently, the synchronous modem unit 133 requests registration to perform communication with the synchronous mobile communication system 30, receives a response thereto, and performs registration with the synchronous mobile communication system 30 (S111).

Thereafter, as the synchronous modem unit 133 transmits an idle handover completion signal to the asynchronous modem unit 123, a process in which the asynchronous modem unit 123 and the asynchronous mobile communication system 20 terminate the connection is already known. Therefore, detailed description will be omitted.

On the other hand, if the signal strength value of the asynchronous mobile communication system is not less than the first threshold as a result of step S103, the asynchronous modem unit 123 performs the process after step S101.

On the other hand, when the signal strength value of the asynchronous mobile communication system as a result of step S109 is not less than or equal to the second threshold value, the asynchronous modem unit 123 passes a predetermined third time Hd3 (S113), and then asynchronous mobile communication. The signal of the system 20 is measured (S115), and it is checked whether the signal strength value is equal to or less than the first threshold value (S117).

Subsequently, when the asynchronous signal strength value of step S117 is less than or equal to the first threshold value, the asynchronous modem unit 123 transmits an idle handover request signal to the asynchronous mobile communication system 20 and receives a response thereto. In step 133, an idle handover request signal is transmitted.

Subsequently, the synchronous modem unit 133 requests registration to perform communication with the synchronous mobile communication system 30, and when registration is successfully performed, the synchronous modem unit 133 switches from the asynchronous mode to the synchronous mode (S119, S121, S123).

Although not shown, when the asynchronous signal strength value is less than or equal to the second threshold in step S109, the asynchronous modem unit 123 waits for a preset second time from the time Hd1 when the asynchronous signal strength is less than or equal to the second threshold. If the signal from the asynchronous mobile communication system 20 is measured again and is still below the second threshold value, the idle handover request signal is transmitted to the asynchronous mobile communication system 20 and a response thereto is received. A method of transmitting an idle handover request signal is also possible. The second time is a time preset in order to prevent unnecessary handover to the synchronous network because the signal strength of the asynchronous mobile communication system 20 is temporarily lowered.

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 idle handover method from the asynchronous network to the synchronous network according to the present invention immediately becomes a synchronous network when the signal strength between the mobile communication terminal located in the asynchronous network and the asynchronous mobile communication system is rapidly lowered below a preset threshold. Since the idle handover is performed, the paging loss can be reduced to a minimum.

Claims (5)

In a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, an asynchronous network to a synchronous network for idle handover of a mobile communication terminal communicating with the asynchronous mobile communication system to a synchronous mobile communication system area. As an idle handover method, A first step of determining whether an asynchronous signal strength value is equal to or less than a first threshold value by measuring a signal from the asynchronous mobile communication system by an asynchronous modem unit of the mobile communication terminal; As a result of the first step, when the asynchronous signal strength value is less than or equal to the first threshold value, the signal from the asynchronous mobile communication system is measured in real time to determine whether the asynchronous signal strength value is less than or equal to a preset second threshold value. A second step of identifying; And If it is confirmed that the asynchronous signal strength value is less than or equal to the second threshold as a result of the checking in the second step, the synchronous modem unit registers to access the synchronous mobile communication system according to a request sent from the asynchronous modem unit. Requesting and switching from an asynchronous mode to a synchronous mode when registration with the synchronous mobile communication system is performed; An idle handover method from an asynchronous network to a synchronous network comprising a. The method of claim 1, The third step, As a result of the second step, when the asynchronous signal strength value is less than or equal to the second threshold value, the asynchronous modem unit from the asynchronous mobile communication system for a preset second time from a first time when the asynchronous signal strength is less than or equal to the second threshold value. Measuring a signal and requesting registration with the synchronous modem unit if the asynchronous signal strength value is less than or equal to the second threshold value; An idle handover method from an asynchronous network to a synchronous network further comprising a. The method of claim 2, After the second step, As a result of the first step, after a preset third time elapses from the time when the asynchronous signal strength value is less than or equal to the first threshold value, the signal from the asynchronous mobile communication system is measured, and the asynchronous signal strength value is determined by the first signal. Requesting registration with the synchronous mobile communication system in order to connect with the synchronous mobile communication system at the request of the asynchronous modem unit when the threshold is less than or equal to the threshold value; And the third time is set to a longer time than the first time. The method of claim 1, As a result of the first step, when the asynchronous signal strength value is less than or equal to the first threshold value, the synchronous modem unit in the power-off state switches to a driving mode or the synchronous modem unit in idle mode is idle according to a request transmitted from the asynchronous modem unit. Performing any one of operations for switching to a state; An idle handover method from an asynchronous network to a synchronous network further comprising a. The method of claim 4, wherein According to a request transmitted from the asynchronous modem unit, performing any one of an operation of switching to a synchronous modem unit in a power-off state or a synchronous modem unit in a low power mode to an idle state, An idle handover method from an asynchronous network to a synchronous network, characterized in that performed immediately before requesting registration with a synchronous mobile communication system.

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