KR100333046B1 - IWF interface unit and method for managing resource of wireless data call processing - Google Patents

Abstract

The present invention relates to data communication matching with a wireless data call processor for establishing a connection to an Inter Working Function (IWF) so that a control station of a digital cellular mobile communication system can provide a wireless data service to a digital mobile subscriber. The present invention provides a resource management method for a device-to-device access device and a radio data call processing. The present invention implements an IWF interface unit (IIU) for connecting an IWF with a control station, and the call of the control station. By checking the state of the link for the connection between the Call Control Processor (CCP) and the IWF, the CCP processes the radio data call according to the state, thereby establishing a radio data call connection between the control station and the IWF.

Description

IWF interface unit and method for managing resource of wireless data call processing}

The present invention relates to a control station and a data communication matching device (Inter Working Function) of a digital cellular mobile communication system (DCS), in particular an IWF interface unit (IWF Interface Unit; IIU) for connecting an IWF with a control station. And a wireless data call processing unit (IIU) and a data communication matching device (IU) and a wireless data call processing unit configured to examine a state of a link for connection between the control station and the IWF and process the wireless data call according to the state. A resource management method for data call processing.

In the base station controller (BSC) of the conventional digital cellular system (DCS), only call processing for voice service can be performed. However, in recent years, the demand for circuit mode services (PC communication, Internet service) has soared, and the call processing function for the conventional voice service does not satisfy the needs of subscribers. Therefore, DCS can provide data communication service through internet connection to provide wireless data service.

Accordingly, the present invention is proposed for the connection between the DCS control station and the IWF to provide a wireless data service to the DCS subscriber as described above, and an object of the present invention is

Implement an IWF Interface Unit (IIU) to connect the control station to the IWF, and examine the status of the link for connection between the call control unit (CCP) and the IWF of the control station By the CCP processing the radio data call, the radio data call processing unit and the data communication matching device (IIU) between the control station and the IWF to form a radio data call connection and a resource management method for radio data call processing To provide.

In order to achieve the above object, the wireless data call processing unit and the data communication matching device (IIU) according to the present invention,

ST-bus Interface Assembly (STIA) for switching the ST-bus connection with the Transcoder and Selector Bank (TSB), which performs the selection and transcoding functions. ;

The technical configuration is characterized by a frame PRI interface assembly (FPIA) which converts a signal from the bus matching unit STIA and matches the data communication matching device IWF.

The link between the FPIA and the IWF is characterized by consisting of a primary rate interface (PRI) and a frame relay (FR) scheme link.

In order to achieve the above object, a resource management method for wireless data call processing according to the present invention,

Monitoring a state of an E1 link associated with a call resource of an IWF Interface Unit (IIU) that matches between an Inter Working Function (IWF) and a cellular mobile control station system;

If the state of the IIU link resource is changed as a result of the monitoring, changing the resource state information and storing it in a common memory;

When the radio data call request is received, the call processing unit accesses the common memory and performs call processing using resource state information of the IIU.

1 is a block diagram of a general digital cellular mobile communication system;

2 is a block diagram of a resource management device for a wireless data service of a control station according to the present invention;

3 is a flowchart illustrating a resource management method for a wireless data service of a control station according to the present invention;

4 is a state transition diagram of resources for wireless data call processing;

5 is a block diagram of a connection device between a wireless data call processing unit and a data communication matching device according to the present invention;

<Explanation of symbols for the main parts of the drawings>

101-107,108-115: TSB 200: IWF Matching Unit (IIU)

211,212,231,232: STIA 220,240: FPIA

27a-27d, 27e-27h: IWF

Hereinafter, with reference to the accompanying drawings, a resource management method for wireless data call processing (IIU) between the wireless data call processing unit and the data communication matching device according to the present invention will be described in detail as follows.

Figure 1 shows a system block configuration for providing a wireless data service to a subscriber in the DCS.

As shown, the BSC of DCS will include CCP 21, CIN 22, CSB 23, VSOA 24, VSIA 25, IIU 26, and IWF 27.

The CCP 21 performs a function for wireless data call processing, and the Vocoder Selector Operating Assembly (VSOA) 24 performs a selecting function and a transcoding function. Inter Working Function (IWF) 27 performs a matching function between the BSC and the Internet to provide a wireless data service to a mobile subscriber. The Vocoder Selector Interface Assembly (VSIA) 25 performs a matching function between the VSOA 24 and the LE 30. Local Exchanger (LE) 30 accepts subscriber lines to perform the switching function between the BSC and other communication networks.

The IWF Interface Unit (IIU) 26 is a device for the connection function between the CCP 21 and the IWF 27.

3 is a flowchart illustrating a resource management method for a wireless data service of a control station according to the present invention according to the present invention.

As shown, monitoring the status of an E1 link associated with a call resource of the IIU 27; If the state of the IIU link resource is changed as a result of the monitoring, changing the resource state information and storing it in a common memory; When the wireless data call request is received, the call processing unit accesses the common memory, and performs call processing using resource state information of the IIU. In FIG. 3, a library includes a file associated with an application. Represents a set, and a library call (CALL) represents a call to a file associated with an application.

Referring to the resource management method for the wireless data service of the control station according to the present invention as follows.

2 shows an apparatus configuration for performing a resource management method for a wireless data service of a control station. The CCP state manager monitors the resource state of the IIU 26 and stores the resource state information in the common memory when the resource state changes. The data call processor performs wireless data call processing.

The CCP state management unit polls the status of the E1 link associated with the call resource of the IIU 27 (Polling: sequentially inquires whether there is a transmission request from a computer or a terminal control device to a plurality of terminal devices and, if there is a request, the terminal. Command the device to start transmission, and if not, the transmission control method inquires about the next terminal device. Then, if the state of the IIU link resource is changed, the resource state information is changed and stored in the common memory. In FIG. 2, a library represents a set of files related to an application, and a library call refers to an application. Invokes the associated file.

4 shows a state transition diagram of resources of the IIU. Its status information management is performed by the CCP status management unit. NORMAL indicates a state where IIU resources are available, and ABNORMAL indicates an abnormal state of IIU resources due to a failure. In addition, BLOCK means that the IIU resource is blocked from being used by the operator's command. The CCP state manager checks the state of the IIU resource, and when the state change occurs, changes the resource state information of the common memory.

After that, when the radio data call request is received, the data call processor should refer to the status information of the resource of the IIU to process the call. Thus, the data call processor accesses the common memory, reads resource state information, allocates available IIU resources, and connects the BSC with the IWF.

5 is a block diagram of IIU according to the present invention.

The IIU 200 is connected to a transcoder and selector bank (TSB) that performs a selection function and a transcoding function included in the VSOA 24, performs switching, and matches the IWF 27.

The IIU 200 may include: a bus matching unit (STIA) 211 and 212 for switching a bus connection with the TSBs 101-115; The frame matching unit (FPIA) 220 converts the signals from the bus matching units 211 and 212 to match the IWF 27.

Referring to the operation of the IIU according to the present invention as follows.

First, two ST-buses per TSB 101-107 (108-115) are connected to STIAs 211,212 (231,232) of IIU 200. Here each TSB accommodates 60 channels, one ST-bus for the path with the mobile station 10 and the other ST-bus for the path with the public switched telephone network (PSTN).

Since the STIAs 211, 212, 231, 232 can connect 16 ST_buses, the STIAs 211, 212, 231, 232 can connect with 480 channels per STIA. If 480 channels are exceeded, another IIU is used to access the TSB block. Two ST-buses are connected per TSB (60 channels), but as a function of aggregation, only 32 channels can be switched to IIU at the same time.

Thus, the signal transmitted to the STIA is transmitted to the IWF 27 by performing a protocol conversion function in the FPIA.

The IIU's FPIA and IWF are implemented according to the number of data calls actually serviced.

When the radio data call request is received, the state information of the IIU resource recorded in the common memory shared between the CCP state management unit and the data call processing unit is read. Therefore, it is determined whether resources of the Primary Rate Interface (PRI) and Frame Relay (FR) of the FPIA of the IIU are determined. As a result of the determination, the available link (FR, PRI) is allocated so that the root with the IWF is connected. Thus, a connection is made through the ST-bus between the TSB and the IIU, and data call processing can be performed through communication with the mobile station 10.

In the case of an outgoing call from a mobile station, data transmitted via a base station is converted to an ISDN PRI via a FR and transmitted to a modem of the IWF as a PCM (Pulse Code Modulation) signal. In the case of the incoming call, the PCM signal received through the assigned link is converted into the FR through the ISDN PRI and transmitted to the base station of the called party.

In this way, the control station can serve the subscriber with the path connection for the data service.

As described above, the present invention implements an IWF interface unit (IIU) for connecting a control station and an IWF, and provides a connection between a call control unit (CCP) and an IWF of a control station. By checking the state of the link and processing the radio data call in the CCP according to the state, there is an effect that a radio data call connection between the control station and the IWF can be established.

In addition, since a wireless data call connection is established between the control station and the IWF, the control station can support the wireless data service.

Claims (3)

A digital cellular mobile communication system having an inter working function (IWF) for providing a data service by matching a digital cellular mobile communication network with the Internet, Monitoring a state of an E1 link associated with a call resource of an IWF Interface Unit (IIU) that matches between the IWF and a cellular mobile communication system; Changing resource state information and storing it in a common memory when the state of the IIU link resource is changed as a result of the monitoring; And when a radio data call request is received, accessing the common memory from the call processor, and performing a call processing using the resource state information of the IIU. A data communication matching device (IWF) for providing a data service by matching a digital cellular mobile communication network with the Internet; In a digital cellular mobile communication system having a transcoder and selector bank (TSB) that performs a selection function and a transcoding function, A bus matching unit (STIA) for switching a bus (ST-bus) connection with the TSB; And a frame PRI interface assembly (FPIA) for converting a signal from the bus matching unit (STIA) and matching the IWF to the IWF. The method of claim 2, wherein the link between the FPIA and the IWF, A device for connecting a wireless data call processor and a data communication matching device comprising a primary rate access interface (PRI) and a frame relay (FR) link.