KR101091038B1 - Handover Method for Dual Band/Dual Mode Mobile Communication Terminal - Google Patents

Abstract

The present invention relates to a handover method of a dual band / dual mode mobile communication terminal, in which a threshold value of a received power is differentially applied to each service during a handover from an asynchronous mobile communication network to a synchronous mobile communication network.

The handover method of the present invention includes asynchronous wireless device for performing asynchronous communication, a synchronous wireless device for performing synchronous communication, and control during wireless communication with the synchronous / asynchronous mobile communication network through the synchronous and asynchronous wireless device. A handover method of a dual band dual mode mobile communication terminal having a common module for performing a method, wherein a mobile communication terminal in a traffic state connected to an asynchronous mobile communication network via the asynchronous wireless device has a first reception power of the asynchronous mobile communication network. A first step of determining whether it is less than a threshold value THp; A second step of determining whether a service currently being provided is a packet data call service when the reception power of the asynchronous mobile communication network is less than the first threshold value THp as a result of the determination; As a result of the determination, when the packet data call service is provided, handover is performed to the synchronous mobile communication network through the synchronous wireless device, and when the packet data call service is not received, the received power of the asynchronous mobile communication network is the second threshold value THc, THc <THp. Determining whether the value is less than), and if the value is less than the second threshold value, handing over to the synchronous mobile communication network through the synchronous wireless device; There is a technical feature made to include.

Description

Handover Method for Dual Band / Dual Mode Mobile Communication Terminal

1 is a block diagram illustrating a connection between a mobile communication terminal and a mobile communication network according to the present invention;

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

3 is a block diagram illustrating a configuration of a common module of FIG. 2;

4 is a conceptual diagram illustrating a handover of a mobile communication terminal in a mixed region of an asynchronous mobile communication network and a synchronous mobile communication network according to the present invention;

5 is a flowchart illustrating a handover process of a mobile communication terminal according to a first embodiment of the present invention;

6 is a flowchart illustrating a handover process of a mobile communication terminal according to a second embodiment of the present invention.

<Brief description of the main parts of the drawings>

100: asynchronous mobile communication network 200: synchronous mobile communication network

400: mobile communication terminal 410: antenna

420: asynchronous radio 430: synchronous radio

440: common module 443: main processor

The present invention relates to a handover method of a dual band / dual mode mobile communication terminal, and more particularly, a dual band / dual mode mobile communication terminal within a WCDMA is synchronously moved according to the received power of the asynchronous mobile communication network. The present invention relates to a handover method of a dual band / dual mode mobile communication terminal for differently applying a threshold for handover when a packet data call service and a circuit service are used when handing over a communication network.

Currently, mobile communication service technology can be broadly classified into an asynchronous service environment centered on Europe and a synchronous service centered on North America. In addition, the IMT-2000 service is being developed mainly in North America and Europe as a new mobile communication technology standard for delivering packets at high speed.

Synchronous IMT-2000 service (synchronous mobile communication network) is developing service type as CDMA2000 1x, CDMA2000 1x EV-DO, and asynchronous IMT-2000 service (asynchronous mobile communication network) is developing as WCDMA UMTS service. have. In such an environment, the problem of roaming between synchronous and asynchronous is the biggest problem. Accordingly, a terminal supporting dual band / dual mode has been developed to smoothly roam a synchronous mobile network and an asynchronous mobile communication network.

On the other hand, the asynchronous mobile communication network is built around an area with a high demand for services. Accordingly, the synchronous mobile communication network has a service area including a service area of an asynchronous system. In the case of mutual movement between synchronous mobile communication systems, handover between systems is required for continuous service provision. Accordingly, various handover methods have been proposed.

Among the proposed handover schemes up to now, the handover from asynchronous to synchronous is mainly based on the receiving power of the asynchronous mobile communication network. When the receiving power of the asynchronous mobile communication network falls below a certain threshold, the handover is performed to the synchronous mobile communication network. To perform.

However, services provided to the mobile communication terminal are various, such as a circuit service and a packet data call service, and although the QoS of each service is different, until now, the same threshold is applied at the time of handover. According to a service being performed by a terminal, there is a problem in that a service is not smoothly connected and abnormal operation occurs.

Accordingly, the present invention is to solve all the disadvantages and problems of the prior art as described above, when handover from an asynchronous mobile communication network to a synchronous mobile communication network, by applying a threshold value according to the QoS of the running service to smooth the service SUMMARY OF THE INVENTION An object of the present invention is to provide a handover method of a dual band / dual mode mobile communication terminal capable of making a connection.

The object of the present invention is a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network are mixed, an asynchronous radio for performing asynchronous communication with the asynchronous mobile communication network, and a synchronous radio for performing synchronous communication with the synchronous mobile communication network. And, a handover method of a dual band dual mode mobile communication terminal having a common module for performing control during wireless communication with the synchronous / asynchronous mobile communication network through the synchronous and asynchronous radio device. A first step of determining, by the mobile communication terminal in the traffic state of being connected to the mobile communication network, whether the received power of the asynchronous mobile communication network is less than the first threshold value THp; A second step of determining whether a service currently being provided is a packet data call service when the reception power of the asynchronous mobile communication network is less than the first threshold value THp as a result of the determination; As a result of the determination, when the packet data call service is provided, handover is performed to the synchronous mobile communication network through the synchronous wireless device, and when the packet data call service is not received, the received power of the asynchronous mobile communication network is the second threshold value THc, THc <THp. Determining whether the value is less than), and if the value is less than the second threshold value, handing over to the synchronous mobile communication network through the synchronous wireless device; It is achieved by a handover method of a dual band / dual mode mobile communication terminal comprising a.

In addition, the object of the present invention is a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network are mixed, an asynchronous wireless device for performing asynchronous communication with the asynchronous mobile communication network, and a synchronization for performing synchronous communication with the synchronous mobile communication network. A handover method of a dual band dual mode mobile communication terminal having a wireless device and a common module for performing control during wireless communication with the synchronous / asynchronous mobile communication network through the synchronous and asynchronous wireless devices, A first step of determining, by the mobile communication terminal in the traffic state of being in a call connection with the asynchronous mobile communication network, whether the service currently being provided is a packet data call service; As a result of the determination, when the packet data call service is being provided, it is determined whether the received power of the asynchronous mobile communication network is less than the first threshold value THp. If the packet data call service is not being provided, it is determined whether the received power of the asynchronous mobile communication network is less than the second threshold value THc. A second step of doing; It is achieved by a handover method of a dual band / dual mode mobile communication terminal comprising a.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, Figure 1 is a block diagram illustrating the configuration of a synchronous and asynchronous mobile communication network according to the present invention.

As shown in FIG. 1, an asynchronous mobile communication network (WCDMA network) 100 includes a wireless station 101 that performs wireless communication with a mobile communication terminal 400 and a wireless station controller (hereinafter, referred to as 'the wireless station 101'). RNC '102 and a Serving GPRS Service Node (hereinafter referred to as' SGSN') 103 connected to the RNC 102 to manage mobility of the mobile communication terminal 400. And an asynchronous communication network data service gateway node (hereinafter referred to as 'GGSN') 106 which is a relay device for performing the packet service control and packet data transmission through the GPRS network 105.

In addition, an exchanger (hereinafter referred to as 'MSC') 104 which performs call exchange is connected to the RNC 102, and the MSC 104 is a number seven signal network (No. 7 signal network) for signal exchange. 107 is connected. The number seven signal network 107 has a short message service center (hereinafter referred to as 'SMSC') 108 that services a short message, an intelligent network controller (hereinafter referred to as 'SCP') 109, and subscriber location information. Home location register (hereinafter referred to as 'HLR') for managing the 110 is connected.

On the other hand, the synchronous mobile communication network (CDMA2000 network) 200, the base station (hereinafter referred to as 'BTS') for performing wireless communication with the mobile communication terminal 400 and the base station controller for controlling the BTS 201 (Hereinafter referred to as 'BSC') 202, a Packet Data Service Node (hereinafter referred to as 'PDSN') 204 connected to the BSC 202 and serving packet data and the PDSN ( A data core network (hereinafter referred to as "DCN") 209 connected to 204 and performing an Internet access service, and an exchanger connected to the BSC 202 to perform an exchange (hereinafter referred to as "MSC"). 203).

The MSC 203 is connected with a number seven signal network (No. 7 signal network) 205 for signal exchange. The number seven signal network 205 includes a short message service center (hereinafter referred to as 'SMSC') 206, an intelligent network controller (hereinafter referred to as 'SCP') 207, and subscriber's location information for serving a short message. A home location register (hereinafter referred to as 'HLR') 208 for managing the connection is connected.

The MSCs 104 and 203 of the asynchronous mobile communication network 100 and the synchronous mobile communication network 200 are interconnected, and the number seven signal networks 107 and 205 are also interconnected to handover the mobile communication terminal 400. Information necessary for transmitting and receiving is transmitted.

In addition, in this embodiment, the synchronous mobile communication network 200 and the asynchronous mobile communication network 100 have HLRs 110 and 208 for managing subscriber information and location information, respectively, but one HLR (dual stack home location). The synchronous mobile communication network 200 and the asynchronous mobile communication network 100 may share subscriber information and location information by using a register.

2 is a block diagram illustrating a configuration of a dual band mobile communication terminal applied to the present invention.

As shown, the dual-band mobile communication terminal 400 is to support both synchronous and asynchronous mobile communication has a stack of each protocol.

The mobile communication terminal 400 applied to the present invention is broadly divided into an antenna 410 for transmitting and receiving radio waves with the synchronous mobile communication network 200 and the asynchronous mobile communication network 100, and the synchronous radio apparatus 430 for synchronous communication. And, asynchronous radio 420 for asynchronous communication, and a common module 440 for providing common resources in synchronous and asynchronous communication.

The synchronous radio device 430 includes a synchronous radio transmitter 432 for radio transmission, a synchronous radio receiver 433 for radio reception, and a synchronous modem unit 434. The synchronous radio transmitter 432 and One side of the synchronous radio receiver 433 is connected to the antenna 410 through a duplexer 431, and the other side is connected to the synchronous modem unit 434.

In addition, the asynchronous radio device 420 also includes an asynchronous radio transmitter 422 for radio transmission, an asynchronous radio receiver 423 for radio reception, and an asynchronous modem unit 424. The asynchronous radio transmitter 422 And one side of the asynchronous radio receiver 423 is connected to the antenna 410 through the duplexer 421 and the other side is connected to the asynchronous modem unit 424.

The common module 440 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 synchronous modem unit 434 and the asynchronous modem unit 424 and perform multimedia functions. Detailed configuration is as follows.

3 is a block diagram illustrating a configuration of a common module of FIG. 2.

As shown, the common module 440 of the mobile communication terminal according to the present invention includes a plurality of dual ports connected to the modem units 424 and 434 of the synchronous radio 430 and the asynchronous radio 420. RAM (Dual Port RAM, hereinafter referred to as 'DPRAM') 441 and 442, connected to the DPRAM 441 and 442, and performs overall control and application execution of synchronous and asynchronous communication of the mobile communication terminal 400. A main processor 443. The main processor 443 includes a memory 444 for storing data, an I / O device 445 for connecting a peripheral device, and a power control module (hereinafter referred to as 'PWM') 446 for power control. Is connected.

The common module 440 having the above-described configuration is equipped with software for user interface, additional service, mobility management, access / session control, resource control, and protocol processing, so that users can use various application services and handover. Performs protocol conversion according to the mobile communication system.

4 is a conceptual diagram of handover in a mobile communication network in which an asynchronous network and a synchronous network are mixed according to an embodiment of the present invention.

As shown, the handover in the present invention is performed in the mobile communication terminal 400 in the region where the area of the asynchronous mobile communication network 100 and the area of the synchronous mobile communication network 200 are mixed, in particular in a traffic state. The mobile communication terminal 400 performs a handover from the asynchronous mobile communication network 100 to the synchronous mobile communication network 200.

In the embodiment of the present invention, the mobile communication terminal 400 measures the received power (RSCP) of the asynchronous mobile communication network 100, if the measured received power does not reach a certain threshold (TH), synchronous mobile communication network Handover to 200 is performed.

In the present invention, the threshold value TH is divided into a first threshold value THp and a second threshold value THc, and the first threshold value is larger than the second threshold value, and is performing packet data call service. In this case, the first threshold value is applied, and in the case of a circuit service, the second threshold value is applied. In addition, the first threshold value is applied even when the circuit service and the packet data call service are simultaneously performed.

In other words, in case of packet data call service such as VOD, which requires QoS guarantee, users can easily detect performance degradation compared to general voice call service (circuit service). Should be. Accordingly, in the present invention, when the terminal is currently performing a packet data call service, whether the handover is determined by applying a threshold value THp higher than the threshold value THc applied to the general circuit service for handover.

The handover process will be described below with reference to the flowcharts of FIGS. 5 and 6 as follows.

5 and 6 are flowcharts illustrating a handover process of a mobile communication terminal according to an exemplary embodiment of the present invention. FIG. 5 is a diagram illustrating a handover process of a mobile communication terminal. Again, the present invention is to determine whether a packet data call service is provided. FIG. 6 illustrates an embodiment in which a terminal first determines whether a packet data call service is applied and applies a corresponding threshold.

As shown in FIG. 5, the mobile communication terminal 400 in the traffic state periodically checks whether the received power RSCP of the asynchronous mobile communication network 100 is less than the first threshold value THp in the asynchronous mode (S101). If it is determined (S102), and the determination result is less than the first threshold value (THp), it is determined whether the current service is a packet data call service requiring high QoS (S103).

As a result of the determination, if it is determined that the circuit service is performed instead of the current packet data call service, the terminal 400 again receives the received power RSCP of the asynchronous mobile communication network 100 below the second threshold value THc. In operation S104, if the received power is less than the second threshold value THc, the mobile terminal 200 performs a handover to the synchronous mobile communication network 200 (S105).

In the present invention, the case where the packet data call service is currently provided includes the case where the packet data call service and the circuit service are simultaneously performed.

On the other hand, if it is determined in step S103 that the current service is a packet data service, the terminal performs a handover to the synchronous mobile communication network 200 (S105).

Next, as shown in FIG. 6, the mobile communication terminal 400 in the traffic state determines whether the current service in the asynchronous mode (S201) is a packet data call service requiring high QoS (S201). In step S202, when the packet data call service is performed, the threshold for handover is set to the first threshold value THp, and otherwise, the threshold value for handover is set to the second threshold value THc.

That is, when it is determined in step S202 that the packet data call service is currently performed, the terminal 400 periodically checks whether the asynchronous mobile communication network 100 has a reception power RSCP less than the first threshold value THp. In operation S203, when the received power is less than the first threshold value THp, the mobile terminal 200 performs a handover to the synchronous mobile communication network 200 (S205).

In addition, as a result of the determination in step S201, when the current packet data call service is not provided, that is, when the current service is a circuit service, the terminal periodically receives the received power RSCP of the asynchronous mobile communication network 100. It is determined whether it is less than the two threshold value THc (S204). If it is less than the second threshold value THc, the handover is performed to the synchronous mobile communication network 200 (S205).

Meanwhile, in the embodiment of the present invention, the service is divided into a packet data call service and a circuit service to apply two threshold values, but various threshold values may be applied according to QoS among packet data call services.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. 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.

Therefore, according to the handover method of the dual band / dual mode mobile communication terminal of the present invention, when handover is performed from the asynchronous mobile communication network to the synchronous mobile communication network, the threshold value is applied differently according to the QoS of the running service. There is an effect that a smooth service connection can be made.

Claims (3)

In a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network are mixed, an asynchronous wireless device for performing asynchronous communication with the asynchronous mobile communication network, a synchronous wireless device for performing synchronous communication with the synchronous mobile communication network, and the synchronous and asynchronous communication. A handover method of a dual mode mobile communication terminal having a common module for performing control in wireless communication with the synchronous and asynchronous mobile communication network through a wireless device, A first step of determining, by the mobile communication terminal connected to the asynchronous mobile communication network through the asynchronous wireless device, whether the received power of the asynchronous mobile communication network is less than a first threshold value THp; A second step of determining whether a service currently being provided is a packet data call service when the reception power of the asynchronous mobile communication network is less than the first threshold value THp as a result of the determination; A third step of handing over to the synchronous mobile communication network through the synchronous wireless device when the packet data call service is provided as a result of the determination; As a result of the determination, it is determined whether the received power of the asynchronous mobile communication network is less than the second threshold value THc when it is not a packet data call service. Fourth step to do; Handover method of a dual-mode mobile communication terminal, characterized in that made. In a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network are mixed, an asynchronous wireless device for performing asynchronous communication with the asynchronous mobile communication network, a synchronous wireless device for performing synchronous communication with the synchronous mobile communication network, and the synchronous and asynchronous communication. A handover method of a dual mode mobile communication terminal having a common module for performing control in wireless communication with the synchronous and asynchronous mobile communication network through a wireless device, A first step of determining whether a service currently being provided by the mobile communication terminal connected to the asynchronous mobile communication network through the asynchronous wireless device is a packet data call service; As a result of the determination, when the packet data call service is being provided, it is determined whether the received power of the asynchronous mobile communication network is less than the first threshold value THp, and if less than the first threshold value, the handover is performed to the synchronous mobile communication network through the synchronous wireless device. A second step of doing; As a result of the determination, when the packet data call service is not being provided, it is determined whether the received power of the asynchronous mobile communication network is less than the second threshold value THc. A third step of handover; Handover method of a dual-mode mobile communication terminal, characterized in that made. The method according to claim 1 or 2, The size of the second threshold value THc is smaller than the size of the first threshold value THp (THc <THp) handover method of a dual-mode mobile communication terminal.

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