KR20050046290A - Hand over method for dual band/dual mode mobile communication terminal - Google Patents

Abstract

The present invention relates to a handover method of a mobile communication terminal supporting a dual band / dual mode capable of smooth roaming in a synchronous mobile communication network and an asynchronous mobile communication network, and a base station of a synchronous mobile communication network transmits a dummy pilot signal for an asynchronous mobile communication network. And determining whether a dummy pilot signal for an asynchronous mobile communication network transmitted from a base station of the synchronous mobile communication network is received through the asynchronous wireless device during a call connection with an asynchronous mobile communication network through an asynchronous wireless device. When it is determined that a signal is received, the mobile communication terminal requests a handover to the asynchronous mobile communication network. Accordingly, the asynchronous mobile communication network determines the handover and notifies the mobile communication terminal of the handover decision, and the asynchronous mobile communication network communicates with the synchronous mobile communication network. Request a handover By performing the overover, the dual band dual mode mobile communication terminal can receive a signal from the synchronous mobile communication network through the asynchronous wireless device and perform a handover even during a call with the asynchronous mobile communication network. And handover between asynchronous and synchronous mobile communication networks can be performed smoothly.

Description

Handover Method for Dual Band / Dual Mode Mobile Communication Terminal

The present invention relates to a mobile communication terminal, and more particularly, to a handover method of a mobile communication terminal supporting a dual band / dual mode capable of smooth handover in a synchronous mobile network and an asynchronous mobile communication network.

Currently, mobile communication service technology can be broadly classified into asynchronous service environment centering on Europe and synchronous service centering on North America. In addition, the IMT-2000 service is evolving around 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 developed as CDMA2000 1x, CDMA2000 1x EV-DO, and asynchronous IMT-2000 service (asynchronous mobile communication network) is developed as WCDMA UMTS service. Doing. 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.

The asynchronous mobile communication network is being built around an area with high service demands. Accordingly, the synchronous mobile communication network has evolved into a form in which the service area includes a service area of an asynchronous system. In the case of mutual movement between the system and the synchronous mobile communication system, handover between systems is required for continuous service provision.

At the time of handover between the asynchronous mobile communication system and the synchronous mobile communication system, both synchronous and asynchronous radios included in the mobile communication terminal supporting the dual band / dual mode are activated. When the mobile terminal moves to the synchronous mobile network during a call through the asynchronous mobile communication network, the synchronous wireless device detects a signal of the synchronous mobile communication network and performs handover accordingly.

Therefore, conventionally, when only one wireless device is selected and activated, the handover rate decreases because the signal of the other mobile network cannot be detected, and the mobile communication terminal operates with different wireless devices activated for handover. When the power of the terminal is excessively consumed there is a problem that the battery life is shortened.

Accordingly, in order to solve the above problems, the present invention provides a handover method of a mobile communication terminal supporting dual band / dual mode which enables smooth handover in a synchronous mobile communication network and an asynchronous mobile communication network while reducing power consumption. The purpose is.

A handover method of a mobile communication terminal supporting a dual band / dual mode according to the present invention for achieving the above object, in the mobile communication network asynchronous mobile communication network and synchronous mobile communication network, asynchronous communication with the asynchronous mobile communication network A synchronous wireless device for performing, synchronous wireless device for performing synchronous communication with the synchronous mobile communication network, and a common module for performing 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 provided, wherein the base station of the synchronous mobile communication network transmits a dummy pilot signal for an asynchronous mobile communication network, and performs the synchronous movement during a call connection with the asynchronous mobile communication network through the asynchronous wireless device. Dummy pilot scene for asynchronous mobile communication network transmitted from base station of communication network A first step of determining whether a call is received through the asynchronous wireless device; a second step of requesting handover to the asynchronous mobile communication network if the dummy pilot signal for the asynchronous mobile communication network is received in the first step; In step 3, the asynchronous mobile communication network determines the handover according to the handover request and notifies the mobile terminal of the handover decision, and the asynchronous mobile communication network requests the handover to the synchronous mobile communication network and performs the handover. It is characterized by including.

In addition, the handover method according to the present invention, the 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 through the synchronous and asynchronous wireless device A handover method of a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network are provided for a dual band dual mode mobile communication terminal having a common module for performing control during wireless communication with a synchronous / asynchronous mobile communication network. And a first step of transmitting a dummy pilot signal for an asynchronous mobile communication network by a base station of the synchronous mobile communication network located in a boundary area of the synchronous mobile communication network, and performing a handover request transmitted by the mobile communication terminal receiving the dummy pilot signal. Step 2 received by the communication network, asynchronous according to the handover request A third step in which a core network of a mobile communication network determines whether to handover and notifies a handover decision to the mobile communication terminal, and after the notification, the asynchronous mobile communication network transmits base station information of a synchronous mobile communication network to the dummy pilot signal. Step 4 of requesting and receiving a terminal; step 5 of transmitting, by the asynchronous mobile communication network, a handover request message including base station information of the synchronous mobile communication network to the synchronous mobile communication network; synchronizing with an asynchronous mobile communication network according to the handover request message. The mobile communication network may include six steps of performing a handover.

Hereinafter, with reference to the accompanying drawings to describe the present invention in detail.

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

Referring to FIG. 1, an asynchronous mobile communication network (WCDMA network) 100 includes a radio station 101 performing wireless communication with a mobile communication terminal 400 and a radio station controller (hereinafter, referred to as 'RNC') for controlling the radio station 101. 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 is connected to the RNC 102 to perform a call exchange, and the MSC 104 is a number seven signal network (No. 7 signal network) for signal exchange ( 107). 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 an 'SCP') 207 for serving a short message, and subscriber's location information. 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 20 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.

Also, in the present 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 register). ) May allow the synchronous mobile communication network 200 and the asynchronous mobile communication network 100 to share subscriber information and location information.

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

Referring to FIG. 2, the dual band mobile communication terminal 400 according to the present invention supports both synchronous mobile communication and asynchronous mobile communication and has a stack of respective protocols.

The mobile communication terminal 400 according 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 a synchronous radio device 430 for synchronous communication. , 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 may include 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 a mobile communication terminal according to the present invention.

Referring to FIG. 3, the common module 440 of the mobile communication terminal according to the present invention includes a plurality of dual devices connected to the modem units 424 and 434 of the synchronous radio device 430 and the asynchronous radio device 420. Dual Port RAM (hereinafter referred to as DPRAM) 441 and 442 and the DPRAM 441 and 442 are connected to perform 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. 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.

In the embodiment of the present invention, the mobile communication terminal 400 should be able to search the synchronous mobile communication network 200 during a call through the asynchronous mobile communication network 100. That is, the mobile communication terminal 400 should be able to detect the signal strength of the BTS 201 of the synchronous mobile communication network 200 and report it to the asynchronous mobile communication network 100.

The mobile communication terminal 400 includes an asynchronous wireless device 420 and a synchronous wireless device 430. Since the asynchronous wireless device 420 is activated during a call through the asynchronous mobile communication network 100, the synchronous mobile communication network. It is difficult to detect the BTS 201 signal of 200.

To this end, in the present embodiment, the BTS 201 of the synchronous mobile communication network 200 at the boundary between the asynchronous mobile communication network 100 and the synchronous mobile communication network 200 transmits a pilot signal (WCDMA pilot signal) of the asynchronous mobile communication network. . In addition, the mobile communication terminal 400 receives the WCDMA pilot signal transmitted from the BTS 201 of the border area through the asynchronous radio device 420, whereby the mobile communication terminal 400 has a current position in the asynchronous mobile communication network 100. Recognizing that the boundary area of the synchronized mobile communication network 200 and performs a handover.

Referring to FIG. 4, all BTSs 201 located in the area A of the asynchronous mobile communication network 100 and the areas B1 and B2 of the synchronous mobile communication network 200 in the boundary area are pilot signals of the asynchronous mobile communication network. (WCDMA pilot signal) is sent.

Accordingly, when the mobile communication terminal 400 moves from the area A of the asynchronous mobile communication network 100 to the boundary area between the wireless station 101 and the synchronous mobile communication network 200 during a call, the mobile communication terminal 400 is The WCDMA pilot signal transmitted from the BTS 201 of the boundary area is received through the asynchronous radio 420. The mobile communication terminal 400 recognizes that the current location is a boundary area between the asynchronous mobile communication network 100 and the synchronous mobile communication network 200 and requests a handover to the radio station 101 of the asynchronous mobile communication network 100.

A handover method according to the above process will be described in detail below.

5A and 5B are flowcharts illustrating a handover method according to an embodiment of the present invention.

Referring to FIGS. 5A and 5B, the mobile terminal 400 connects to the asynchronous mobile communication network 100 through the asynchronous wireless device 420 of the mobile communication terminal 400 and performs a call (S10). The modem unit 424 determines whether a WCDMA dummy pilot signal transmitted from the BTS 201 of the synchronous mobile communication network 200 is received through the asynchronous wireless device 420 (S21). At this time, the WCDMA dummy pilot signal includes base station information of the BTS 201.

If it is determined in step S21 that the WCDMA dummy pilot signal is received, the asynchronous radio apparatus 420 recognizes that the current location of the mobile communication terminal 400 is a boundary area and performs a handover request to the asynchronous mobile communication network 100 (S22). .

Accordingly, the MSC 104 of the asynchronous mobile communication network 100 determines whether to handover (S31). At this time, if it is determined that the handover is impossible, the mobile communication terminal notifies of the handover impossible (S33). However, if the handover is determined in step S31 (according to the preset condition), the MSC 104 notifies the handover to the asynchronous radio device 420 of the mobile communication terminal 400 (S32).

The asynchronous radio device 420 of the mobile communication terminal 400 transmits the base station information of the BTS 201 included in the WCDMA dummy pilot signal to the MSC 104 (S41).

After step S41, the asynchronous mobile communication network 100 requests a handover of the mobile communication terminal 400 to the MSC 203 of the synchronous mobile communication network 200 (Relocation Required) (S42). At this time, the mobile communication terminal 400 The identification number of the mobile station is transmitted together, and a handoff is requested to the exchange (MSC) using a Mobile Application Part (MAP) message defined in IS-41.

Accordingly, the MSC 203 transmits a message requesting a handover to the BSC / BTS (Handoff Request) (S43), and the BSC / BTS transmits a response signal (Handoff Req Ack) to the MSC 203 (S44). ).

The BTSs of all the synchronous mobile communication networks 200 in the boundary area are forwarded through a forward fundamental channel (F-FCH) for forward traffic transmission to the synchronous radio 430 of the mobile communication terminal 400. NULL traffic is transmitted (null F-FCH frames) (S50). Accordingly, the omni-directional channel is allocated to the synchronous radio device 430 of the mobile communication terminal 400.

As such, when the handover preparation is completed in the synchronous mobile communication network 200, the MSC 203 of the synchronous mobile communication network 200 transmits a response signal (facdir2, relocation command) for step S42 to the asynchronous mobile communication network 100. (S61).

Thereafter, the asynchronous mobile communication network 100 transmits a handover request message to the asynchronous wireless device 420 of the mobile communication terminal 400 through the radio station / RNC (S62 and S63). At this time, the handover request message includes a message related to a synchronous mobile communication network, in particular a handoff direction message (HDM) having information for channel allocation.

Accordingly, the asynchronous radio device 420 requests for channel allocation through the main processor 443 (S71), and the main processor 443 performs channel assignment to the synchronous radio device 430 (channel assignment) (S72). .

Accordingly, the synchronous modem unit 434 of the synchronous radio device 430 is started through a switch-on and warm-up process (S80), and a pilot channel acquisition (S91) and a synchronization channel are obtained (S92). By acquiring the synchronization, the BTS / BSC of the synchronous mobile communication network 200 and the mobile communication terminal 400 are synchronized, and by acquiring the synchronization channel, timing information and other system information are received from the BTS / BSC.

Accordingly, the synchronous wireless device 430 of the mobile communication terminal 400 initializes the traffic channel through the idle state (idle state) (S100) (S110) and transitions to the traffic state, thereby connecting to the synchronous mobile communication network 200. Will be done.

As such, when the communication preparation process is completed, the synchronous radio 430 notifies the call connection to the asynchronous radio 420 through the main processor 443 (S121). The vocoder is changed to the synchronous radio device 430 (S122).

Accordingly, mode switching between the asynchronous wireless device 420 and the synchronous wireless device 430 of the mobile communication terminal 400 is completed, and the synchronous wireless device 430 is a reverse base channel to the BTS / BSC of the synchronous mobile communication network 200. (R-FCH frames) (S130) and the mobile communication terminal 400 acquires backward synchronization (S140), thereby synchronously moving with the mobile communication terminal 400. A connection is established between the communication network 200 and the synchronous wireless device 430 of the mobile communication terminal 400 notifies the synchronous mobile communication network 200 of the handover completion (S150).

Thereafter, the BTS / BSC notifies the MSC 203 of the handover completion (Handoff Complete, MSONCH) (S161), and the MSC 203 notifies the asynchronous mobile communication network 100 of the handover completion (S162).

Accordingly, the MSC 104 of the asynchronous mobile communication network 100 requests the radio station / RNC to release the call with the asynchronous wireless device 420 of the mobile communication terminal 400 (Iu Release Command, S171). The asynchronous mobile communication network 100 releases the call with the asynchronous radio apparatus 420 (S172), and reports that the call release is completed to the core network (IU Rel. Complete) (S173), the asynchronous mobile communication network 100 To the synchronous mobile communication network 200 is completed.

According to the present invention described above, in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, a dual band dual signal is transmitted by transmitting a WCDMA dummy pilot signal from a base station of a synchronous mobile communication network in a boundary area between the asynchronous mobile communication network and a synchronous mobile communication network. Mode Mobile communication terminal receives the signal of synchronous mobile communication network through asynchronous wireless device and performs handover even while talking with asynchronous mobile communication network to prevent power consumption due to activation of multiple wireless devices and handover between asynchronous and synchronous mobile communication network. There is an effect that can be performed smoothly.

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 according to the present invention;

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

4 is an explanatory diagram for explaining a handover of a mobile communication terminal according to an area of an asynchronous mobile communication network and a synchronous mobile communication network according to the present invention;

5A and 5B are flowcharts illustrating a handover process of a mobile communication terminal according to 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 wireless device 430: synchronous wireless device

440: common module 443: main processor

Claims (9)

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 band dual mode mobile communication terminal having a common module for performing control during wireless communication with the synchronous / asynchronous mobile communication network through a wireless device, The base station of the synchronous mobile communication network transmits a dummy pilot signal for an asynchronous mobile communication network, Determining whether a dummy pilot signal for an asynchronous mobile communication network transmitted from a base station of the synchronous mobile communication network is received through the asynchronous wireless device during a call connection with the asynchronous mobile communication network through the asynchronous wireless device; In step 1, if it is determined that the dummy pilot signal for the asynchronous mobile communication network is received, the mobile communication terminal requests a handover to the asynchronous mobile communication network; 3, wherein the asynchronous mobile communication network determines the handover according to the handover request in step 2, notifies the mobile communication terminal of the handover decision, and the asynchronous mobile communication network requests the handover to the synchronous mobile communication network and performs handover. Handover method comprising the step of. The method of claim 2, In step 3, as the asynchronous mobile communication network requests a handover to the synchronous mobile communication network, the base station of the synchronous mobile communication network performs omnidirectional channel allocation to the synchronous wireless device of the mobile communication terminal, The exchange of the synchronous mobile communication network transmitting a response signal according to the handover request to the asynchronous mobile communication network; Transmitting, by the asynchronous mobile communication network, a handover request message including channel allocation information to an asynchronous wireless device of the mobile communication terminal; Transmitting, by the asynchronous radio device of the mobile communication terminal, the channel assignment information to the synchronous radio device; Performing mode switching between the asynchronous radio and the synchronous radio; Performing connection by acquiring reverse channel allocation and synchronization between the synchronous radio and the synchronous mobile communication network; and Requesting, by the synchronous mobile communication system, a call release from the asynchronous modem to the asynchronous mobile communication system. The method of claim 1, When the asynchronous mobile communication network determines the handover and notifies the mobile communication terminal of the handover decision, And the mobile communication terminal transmits base station information of a synchronous mobile communication network to the asynchronous mobile communication network. The method of claim 2, The mode switching between the asynchronous radio and the synchronous radio may include: Starting by performing switch-on and warm-up of the synchronous radio, acquiring a pilot channel and a synchronous channel from the synchronous mobile communication network, and bringing the synchronous radio into an idle state. Transitioning and initiating a traffic channel by the synchronous radio in the idle state, and transitioning to a traffic state after initialization by the synchronous radio. The method of claim 1, And the dummy pilot signal for the asynchronous mobile communication network is all base stations of the synchronous mobile communication network located at the boundary area between the asynchronous mobile communication network and the synchronous mobile communication network. An asynchronous wireless device for performing asynchronous communication with an asynchronous mobile communication network, a synchronous wireless device for performing synchronous communication with the synchronous mobile communication network, and during wireless communication with the synchronous / asynchronous mobile communication network through the synchronous and asynchronous wireless device. A handover method of a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network for a dual band dual mode mobile communication terminal including a common module for performing control are provided. A first step of transmitting a dummy pilot signal for an asynchronous mobile communication network by a base station of the synchronous mobile communication network located at a boundary area between the asynchronous mobile communication network and the synchronous mobile communication network; Receiving, by the asynchronous mobile communication network, a handover request transmitted by the mobile communication terminal receiving the dummy pilot signal; A third step of determining whether to handover by a core network of an asynchronous mobile communication network according to the handover request, and notifying the mobile communication terminal of a handover decision; After the notification, the asynchronous mobile communication network requests and receives the base station information of the synchronous mobile communication network for the dummy pilot signal to the mobile communication terminal, Transmitting, by the asynchronous mobile communication network, a handover request message including base station information of the synchronous mobile communication network to the synchronous mobile communication network; and And a sixth step of performing a handover between the asynchronous mobile communication network and the synchronous mobile communication network according to the handover request message. The method of claim 6, The sixth step may include, by the base station of the synchronous mobile communication network according to the base station information of the synchronous mobile communication network, performing omni-directional channel allocation to the synchronous wireless device of the mobile communication terminal according to the handover request message; Transmitting, by the exchange of the synchronous mobile communication network, a response signal according to the handover request to the asynchronous mobile communication network;  Transmitting, by the asynchronous mobile communication network, a handover request message including channel allocation information to an asynchronous wireless device of the mobile communication terminal; Performing connection by matching uplink channel allocation and synchronization of a synchronous mobile communication network and a mobile communication terminal according to the handover request message; and And requesting, by the synchronous mobile communication network, to release the call with an asynchronous radio device to the asynchronous mobile communication network after the connection. The method of claim 6, The mobile communication terminal transmits the channel allocation information from the asynchronous wireless device to the synchronous wireless device according to the handover request message to perform mode switching between the asynchronous wireless device and the synchronous wireless device. Handover method characterized in that to perform the connection by obtaining the reverse channel allocation and synchronization between the mobile communication network. The method of claim 8, The mode switching process between the asynchronous radio and the synchronous radio may include starting and performing a switch-on and warm-up of the synchronous radio, and the synchronous radio establishes a pilot channel and a synchronization channel from the synchronous mobile communication network. Acquiring, the synchronous radio transitioning to an idle state, the synchronous radio in the idle state initializing a traffic channel, and the synchronous radio transitioning to a traffic state after initialization. Handover method characterized in that.