KR100612683B1 - Decision Method of Initial Transmitting Power for Mobile Communication Terminal After Hand-over Between Asynchronous Communication Network and Synchronous Communication Network - Google Patents

Abstract

The present invention provides a method for setting an initial transmission power of a mobile communication terminal handed over to a synchronous network from an asynchronous network that sets an initial power value in order for the mobile terminal handovered from an asynchronous network to a synchronous network to transition from an idle state to a traffic state. To provide.

The synchronous mobile communication system receives a connection request signal transmitted by an initial transmission power value calculated based on an initial power value from an idle mobile communication terminal, and transmits a response to the connection request signal to the mobile communication terminal. ; Including the step of transmitting and receiving traffic between the synchronous mobile communication system and the mobile communication terminal, there is an effect that the connection success rate for transition to the traffic state, such as call setup between the mobile communication terminal and the synchronous mobile communication system can be increased.

Traffic, handover

Description

{Decision Method of Initial Transmitting Power for Mobile Communication Terminal After Hand-over Between Asynchronous Communication Network and Synchronous Communication Network}

1 is a view for explaining a state change of a general mobile communication terminal in a synchronous mobile communication system;

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

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

4 is a view for explaining a state change of a mobile communication terminal in a synchronous mobile communication system according to an embodiment of the present invention;

5 is a flowchart illustrating a method for setting initial transmission power of a mobile communication terminal in a synchronous network according to an embodiment of 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: switch 370: packet data service node

380 data core network

The present invention relates to an initial transmission power setting method of a mobile communication terminal handed over from an asynchronous network to a synchronous network. More specifically, the mobile communication terminal handovered from an asynchronous network to a synchronous network transitions from an idle state to a traffic state. In order to provide an initial transmission power setting method of a mobile communication terminal handed over from the asynchronous network to set the initial power value to the synchronous network.

1 is a view for explaining a state change of a general mobile communication terminal in a synchronous mobile communication system.

When attempting to access a mobile communication terminal and a base station in an existing mobile communication network, the mobile communication terminal transmits an arbitrary transmission power to the base station and attempts to connect the mobile communication terminal and the base station. Then, the mobile terminal performs a random access procedure in the system access step of transmitting a higher transmission power to the base station after a certain time.

Meanwhile, various types of mobile communication systems have been developed according to the development of mobile communication technology and the evolution of communication networks. 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, handover between systems is required for continuous service provision.

In addition, on the premise of successful handover, there is a demand for an initial power calculation method in a mobile communication terminal for transition to a successful traffic state in a synchronous mobile communication system.

However, when attempting a handover from the asynchronous mobile communication system to the synchronous mobile communication system, the mobile communication terminal directly transitions to the traffic state without performing a random access procedure in the idle state of the synchronous mobile communication system and performs connection with the synchronous mobile communication system. Therefore, the mobile communication terminal which has performed the handover to the synchronous mobile communication system frequently fails to transition to the traffic state.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the initial transmission power value is changed when switching to a traffic state in a synchronous mobile communication system of a mobile communication terminal which performs a handover from an asynchronous mobile communication system to a synchronous mobile communication system. There is a technical problem to provide a method for setting initial transmission power of a mobile communication terminal handed over from an asynchronous network to a synchronous network.

The present invention provides a multi-mode multi-band mobile communication terminal handed over from the asynchronous mobile communication system to the synchronous mobile communication system in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed. An initial power setting method for transitioning to a traffic state,

When the mobile communication terminal is handed over from the asynchronous mobile communication system to the synchronous mobile communication system, the initial power value received from the asynchronous mobile communication system by the asynchronous modem unit of the mobile communication terminal to the synchronous modem unit of the mobile communication terminal. Send,

The synchronous mobile communication system receives a connection request signal transmitted by an initial transmission power value calculated based on the initial power value from the idle mobile communication terminal, and sends a response to the connection request signal to the mobile communication. Transmitting to the terminal; And transmitting and receiving traffic between the synchronous mobile communication system and the mobile communication terminal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a mobile communication terminal refers to a multi-mode multi-band mobile communication terminal that can be used in both an asynchronous mobile communication system and a synchronous mobile communication system. The mobile communication terminal can receive a synchronous mobile communication system signal using a synchronous modem unit while using a service of an asynchronous mobile communication system, and a signal and a synchronous mobile communication system using a synchronous modem unit while using a service of an asynchronous mobile communication system. It can be divided into a form that can transmit and receive, a detailed description will be described later.

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

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

The asynchronous mobile communication system 20 is a wireless network controller (Node B / RNC, 210) for controlling Node B and Node B as a base station for wireless section communication with the mobile communication terminal 10, wireless network controller 210 Short message service connected to the asynchronous exchange (MSC, 220), the asynchronous exchange 220 and the No.7 common signaling network 230 to perform a call exchange for providing a service to the mobile communication terminal 10 is connected to the Center (SMSC, 240), intelligent network controller (SCP, 250) and home location register (HLR, 260), the wireless network controller 210 and GPRS (General Packet Radio Service) network 280 is connected to the mobile communication terminal ( 10) is connected via a Serving Support Node (SGSN) 270, a SGSN 270 and a General Packet Radio Service (GPRS) network 280 that maintains a location track and performs access control and security functions, and the Internet 40 And a Gateway GPRS Support Node (GGSN) 290 connected to and supporting interworking with external packets.

In addition, the synchronous mobile communication system 30 is connected to the mobile communication terminal 10 and the base station controller (BTS / BSC, 310) for controlling the base station and the base station for supporting the wireless section communication, and connected to one or more base station controller to perform a call exchange A short message service center (SMSC, 340), an intelligent network controller (SCP, 350) and a home location register connected through an exchange (MSC) 320, an exchange 320, and a No. 7 common signaling network 330 to perform HLR 360, a packet data service node (PDSN) 370 connected to a base station controller for providing a packet data service to a subscriber, a data core network for supporting a connection between the packet data service node 370 and the Internet 40 (DCN, 380).

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

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

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

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 modem unit 133 for processing a wireless section protocol with a synchronous mobile communication system, and a vocoder 134 for encrypting and decrypting a voice signal.

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

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

The mobile communication terminal described above is a terminal capable of receiving a signal of a synchronous mobile communication system while using a service of an asynchronous mobile communication system, and a terminal capable of transmitting and receiving a signal with a synchronous mobile communication system while using a service of an asynchronous mobile communication system. In the present invention, a terminal capable of transmitting and receiving signals with the synchronous mobile communication system while using a service of the asynchronous mobile communication system will be described as an example. In the case of a mobile communication terminal capable of transmitting and receiving signals to and from a synchronous mobile communication system while using a service of an asynchronous mobile communication system, a device configuration such as duplexers 121 and 131 becomes somewhat more complicated than a mobile communication terminal capable of only receiving signals, Designed to take into account impacts.

4 is a view for explaining a state change of a mobile communication terminal in a synchronous mobile communication system according to an embodiment of the present invention, in which a mobile communication terminal performing handover from an asynchronous mobile communication system to a synchronous mobile communication system is synchronized. It describes the process of switching to the traffic state in the mobile communication system.

As shown in FIG. 4, after performing a handover from the asynchronous mobile communication system 20 to the synchronous mobile communication system 30, the multi-mode multiband mobile communication terminal located in the synchronous mobile communication system 30 ( 10) is a state in which the traffic state (I) does not go through the existing system access state when switching to the traffic state after the transition from the synchronous modem initialization state to the idle state. Traffic State).

After performing the handover, the reason for switching to the traffic state without going through the system access state is that when performing the handover process from the asynchronous mobile communication system to the synchronous mobile communication system, the pilot channel search and the sync channel search are performed in advance. The reason for this is as follows.

5 is a flowchart illustrating a method for setting initial transmission power of a mobile communication terminal in a synchronous network according to an embodiment of the present invention, in which a mobile communication terminal transmits and receives a signal with a synchronous mobile communication system while using a service of an asynchronous mobile communication system. A case in which a possible form is described will be described as an example.

As the mobile communication terminal 10 using the service of the asynchronous mobile communication system moves to the synchronous area through the handover cell area, the asynchronous modem unit of the mobile communication terminal 10 receives system information from the base station of the synchronous handover cell area. (S101), the asynchronous modem unit requests the synchronous modem unit to be driven by the synchronous modem unit (S102), and requests a handover to the asynchronous mobile communication system (S103). Here, the signal including the system information uses the same frequency as the frequency used in the asynchronous mobile communication system.

Accordingly, the synchronous modem unit prepares for initializing the modem and searching for a pilot channel of the synchronous mobile communication system (S104), and after searching for a pilot channel and a synchronous channel of the synchronous mobile communication system (S105 and S106), the idle state. Transition to (Idle State) (S107). Thereafter, if the asynchronous mobile communication system instructs to perform the handover (S108), the asynchronous modem unit transmits a channel assignment message to the synchronous modem unit (S109).

In steps S108 and S109, the asynchronous mobile communication system transmits INIT_PWR (initial power value of the asynchronous network, hereinafter referred to as 'initial power value' for convenience of explanation) to the asynchronous modem unit, and the asynchronous modem unit transmits a channel to the synchronous modem unit. When the assignment message is transmitted, the initial power value transmitted from the asynchronous mobile communication system is also transmitted. At this time, the initial power value (INIT_PWR) is a value that can be variably applied by the operator of the network according to a specific cell environment, and the size thereof is an average power value output from the mobile communication terminal 10 and varies according to the cell environment. Is determined.

Next, the synchronous modem unit initializes to transition to the traffic state (S110), and transmits backward traffic to synchronize with the synchronous mobile communication system (S111). Subsequently, the synchronous modem unit reports to the base station of the synchronous mobile communication system that the handover is completed (S112), and then switches off the vocoder by turning off the asynchronous modem and the asynchronous vocoder and driving the synchronous vocoder (S113).

Upon completion of the handover from the asynchronous mobile communication system to the synchronous mobile communication system, the mobile communication terminal 10 transitioned to the idle state is an SMS (Short Message Service) or paging transmitted from another mobile communication terminal according to a user's request. Switch to the traffic state to perform the action.

The synchronous modem unit of the idle mobile communication terminal 10 located in the synchronous mobile communication system 30 calculates an initial transmission power value to be transmitted to the synchronous mobile communication system in order to transition to the traffic state (S114).

In step S114, the initial transmission power value set by the synchronous modem unit of the mobile communication terminal 10 is calculated by [Equation 1].

[Equation 1]

Initial transmit power value =-(average received power of synchronous modem part) + initial power + offset power

Here, the average reception power of the synchronous modem unit is an average power value transmitted and received from the base station in the state where the power of the mobile communication terminal 10 is turned on. This means that the environment of the synchronous mobile communication system 30 to which it belongs is good, and if the average received power value of the synchronous modem unit is high when the initial transmission power value of the mobile communication terminal 10 is set, the initial transmission power value is lowered. If the negative average received power value is low, the initial transmit power value is set high.

In addition, the initial power value is a value transmitted from the asynchronous mobile communication system in step S109 and transmitted by the asynchronous modem unit to the synchronous modem unit, and random access (Random Access) in which the mobile communication terminal 10 determines the initial transmission power in the idle state. Since the system directly transitions to the traffic state without going through the steps, the initial power determined in the asynchronous mobile communication system is reflected in determining the initial transmit power. Here, the initial power is a value determined in the network based on the average power value output from the mobile communication terminal 10 in a specific cell environment stored in the asynchronous mobile communication system, and reflects the cell environment.

Offset (Offset) power is a value that is determined according to the internal characteristics of the mobile communication terminal 10 that determines the degree of signal transmission and reception with the network, and is for correcting the value of power that varies according to the characteristics of the mobile communication terminal 10. .

The synchronous modem unit of the mobile communication terminal 10 transmits a connection request signal requesting to be connected to the synchronous mobile communication system to the synchronous mobile communication system at the calculated initial transmission power value (S115).

After step S115, when the synchronous mobile communication system receives the connection request signal transmitted with the initial transmission power value from the synchronous modem unit of the mobile communication terminal 10 and transmits a response thereto (S116), the mobile communication system with the synchronous mobile communication system The terminal 10 transmits and receives a control message for call setup and the like.

In the detailed description of the present invention, the case where the mobile communication terminal is capable of transmitting and receiving signals with the synchronous mobile communication system while using the service of the asynchronous mobile communication system has been described as an example. It is also possible to apply a mobile communication terminal that can only receive signals from the synchronous mobile communication system.

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, according to the initial transmission power setting method of the mobile communication terminal handed over from the asynchronous mobile communication system to the synchronous mobile communication system, the mobile communication terminal located in the area of the synchronous mobile communication system may transition from the idle state to the traffic state. When the initial transmission power transmitted to the base station is adjusted according to a predetermined initial transmission power calculation criterion, the connection success rate for transitioning to a traffic state, such as a call setup between the mobile communication terminal and the synchronous mobile communication system, can be increased.

Claims (4)

In a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, initial transmission power setting for a multimode multi-band mobile communication terminal handed over from the asynchronous mobile communication system to the synchronous mobile communication system to transition to a traffic state As a method, When the mobile communication terminal hands over from the asynchronous mobile communication system to the synchronous mobile communication system, the initial power value received from the asynchronous mobile communication system by the asynchronous modem unit of the mobile communication terminal to the synchronous modem unit of the mobile communication terminal. Send, The synchronous mobile communication system receives a connection request signal transmitted by the initial transmission power value of the mobile communication terminal, which is a value obtained by subtracting the average received power value of the synchronous modem unit from the initial power value from the idle mobile communication terminal, Transmitting a response to the access request signal to the mobile communication terminal; And Transmitting and receiving traffic between the synchronous mobile communication system and the mobile communication terminal; Initial transmission power setting method of a mobile communication terminal comprising a. According to claim 1, The average received power value of the synchronous modem unit is an average value of power values transmitted and received from a base station of a synchronous mobile communication system in which the synchronous modem unit is located, and the initial power value is output from the mobile communication terminal in the asynchronous mobile communication system. The initial transmission power setting method of the mobile communication terminal, characterized in that the value determined according to the average of the power value. According to claim 1, The initial transmit power value calculated by the mobile communication terminal is a value obtained by adding offset power to a value obtained by subtracting the average received power value of the synchronous modem unit from the initial power value. The average received power value of the synchronous modem unit is an average value of power values transmitted and received from a base station of a synchronous mobile communication system in which the synchronous modem unit is located, and the initial power value is output from the mobile communication terminal in the asynchronous mobile communication system. The value is determined based on the average of the power values And the initial transmission power value is corrected by the offset power. According to claim 1, And the initial power value is transmitted with a handover request message transmitted from an asynchronous mobile communication system to the mobile communication terminal during handover of the mobile communication terminal.

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