KR20040053993A - Interface System In multi-DECT Protocol stacks - Google Patents

Abstract

PURPOSE: A system for performing an interface between multiple DECT(Digital European Cordless Telecommunication) protocol stacks is provided to apply each part of DECT protocol stacks to each DECT module, thereby supporting multiple interface boards and multiple cells. CONSTITUTION: A PBX(300) controls assign/cancel processes of a wireless channel for a call, and performs call connection, maintenance, and canceling operations. A DBS(DECT Base Station)(350) performs voice communication and data communication with a DECT terminal, and assigns/cancels wireless channels under control of the PBX(300). A BSI(DECT Base Station Interface Board)(370) carries out an interface between the PBX(300) and the DBS(350). The PBX(300) comprises as follows. A call control module(311) processes an inputted call. A main system(315) sets/cancels the call, exchanges a message, controls the assignment and cancellation of the wireless channels, and controls data multiplexing/processing. A system task(317) performs an interface and a call control function.

Description

Interface System In multi-DECT Protocol stacks}

The present invention relates to an exchange system, and more particularly, to a system that performs an interface between a multi-text protocol stack that enables the interface board and a multi-cell user to properly cope with a user request capacity of a DECT (Digital European Cordless Telecommunication) system. It is about.

European wireless communication system (DECT: Digital System) is a digital wireless communication protocol for providing mobile communication service to existing private switching system (PABX). Standardized by the European Telecommunication Standards Institute.

In comparison with the functions provided by the outgoing dedicated wireless telephone (CT-2) and the deck system, the donation provided by the text system is based on incoming / outgoing functions, data communication functions, improved handover based on multiple cells, and comprehensive information. It has more enhanced features such as intergrated switched digital network (ISDN) or interworking with wireless LAN (LAN), increased subscriber capacity. Therefore, the deck system overcomes the limitations of the functions and capacity of the existing outgoing-only radiotelephone (CT-2).

In addition, compared to the Global System for Mobile Communication (GSM), which uses a European-type cellular system that has a cell radius of several tens of kilometers and provides a wide range of mobile services, the Deck system is a narrow-area mobile service with a cell radius of about 100m to 200m. It is a very small cellular (Picocellular) method to provide a communication service using the existing Public Switched Telephone Network (PSTN) has become a supplement to GS for indoor mobile communication such as buildings.

1 is a diagram illustrating a single deck protocol stack system according to the prior art.

In general, an exchange system (KP / PBX) that provides a wireless solution supports mobility between base stations (BS). Typically, a system for a DECT having a single deck protocol stack system, as shown in FIG. 1, places a DECT protocol stack on any element in the switching system to provide a service for the deck. Is supported. However, there is a problem in that a system having a single deck protocol stack supports only a deck service limited to a service capacity that can be supported by a DECT interface card because there is only one deck protocol stack.

2 illustrates a multiple deck protocol stack system according to the prior art.

The deck system having the multiple deck protocol stack system includes a multiple deck interface board (Multi DECT Interface board) in units of a multi-bearer control entity in MAC layer (MBC) as shown in FIG.

Thus, in the deck system, the Master board includes all of the DECT protocol stacks, and the Slave board includes the MBC tasks and the DECT protocol stacks in the DECT protocol stack. Only modules that are in charge of the master board and interfaces are provided.

Thus, a text cluster is configured based on each deck interface card to perform a text service. In such a cluster structure, a load on an interface between a master board and a slave board is generated.

Thus, there is a problem in that exception processing is often performed for flow control between tasks due to a load difference between the base station connected to the master board and the base station connected to the slave board.

Accordingly, an object of the present invention is to improve the problems of the prior art generated by applying multiple interface cards and multiple cells using a deck by applying each part of the deck protocol stack to an appropriate position in each text module. The present invention provides a deck system that supports a board-to-board interface that can support multiple cells according to user requirements.

1 is a diagram illustrating a single deck protocol stack system according to the prior art.

2 illustrates a multiple deck protocol stack system according to the prior art.

3 is a block diagram of a system for performing an interface between multiple text protocol stacks according to an embodiment of the present invention.

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

300: exchange system 311: call control module

313 operating system 315 main system

317: Existing system Dask 350: Deck base station

351: radio frequency module 353: burst controller

357: traffic bearer controller 359: DBC

370: base station interface module 371: IPC interface

373: base station interface module 375: resource manager task

The present invention for achieving the above object, in the system for performing the interface between the multiple deck protocol stack, controlling the allocation and release of the radio channel for the call occurring in the deck terminal, and performs the call connection and maintenance and release An exchange system; A dec base station for performing voice and data communication with the dec terminal and allocating and releasing radio channels according to the control of the switching system for a call generated from the dec terminal; And a deck base station interface for performing an interface between the switching system and the deck base station.

Now, referring to FIG. 3, a system for performing an interface between multiple text protocol stacks according to an exemplary embodiment of the present invention will be described in detail.

3 is a block diagram of a system for performing an interface between multiple text protocol stacks according to an embodiment of the present invention.

As shown in FIG. 3, the present invention provides an exchange system (KP / PBX) 300, a DECT Base Station (DBS) 350, and a DECT Base Station Interface board (BSI). 370 has a system hardware structure.

A DECT protocol stack is applied to each of the hardware, that is, the exchange system 300, the deck base station 350, and the deck base station interface board 370.

The exchange system 300 is composed of a call control module (311), an operating system (OS) 313, the main system (315), the existing system task 317, It consists of an interface board (Interface board) for interfacing with the deck base station 350, and a system board for managing the interface board, and operates the call control (Call Control) and the overall exchange operation (OS: Operating System).

Here, the main system 315 may include a link access procedure (LAP) -C task, an Lc task, that is, a transmission Lc task (Lc_tx) and a data link control (DLC) layer. It is equipped with the MC-SAP task that performs the interface between the Lc task for reception (Lc_rx), MBC task and Lap-C task, the call control task of the network layer (NWK (NetWorK layer)), and the mobile control. Control) and LCE tasks, and the multiplexing and multiplexing of multiplexing and management of all data through the MAC layer connection with the dec terminal in the medium access control layer (MAC layer). A bearer control (MBC) task is provided, and a deck module (DECT module) is provided.

Here, the physical layer (PHL) performs a function of separating the radio spectrum into physical channels in a fixed frequency and time dimension.

The medium access control layer (MAC layer) performs a function of creating, maintaining, and releasing bearers by selecting physical channels and accessing or releasing the selected physical channels, and controlling information. Performs multiplexing and demultiplexing of packet information in slot unit together with upper layer information and error control information.

The functions of the media access control layer may be classified into cluster control functions and cell site control functions.

The Data Link Control Layer (DLC Layer) performs a processing function of making or disconnecting a connection in response to a request of a network layer.

Network Layer (NWK Layer) performs the function of exchanging messages for call establishment, maintenance and release.

Meanwhile, the exchange system 300 and the deck base station interface board 370 communicate with each other through an interprocessor communication (IPC) protocol, and the IPC interface 371 supports such communication.

The deck base station 350 includes a radio frequency (RF) module 351, a burst mode controller (BMC) 353, and a traffic bearer control entity in MAC layer (TBC). 357 and DBC 359 are provided.

Here, the burst mode controller 353 receives ADPCM (Adaptive Differential Pulse Code Modulation) data transmitted from a voice processor (not shown) of the deck base station 350 according to characteristics of the dec system. And transmits the signal received from the exchange system 300 through the timeslot determined in the following manner.

The radio frequency module 351 and the burst mode controller 353 perform data exchange on the air with a DECT terminal.

In addition, the TBC 357 performs a function of generating or releasing a traffic bearer, and the MBC 315 controls the TBC 357.

In addition, the deck base station 350 is connected to the switching system 300 by wire, and performs data and voice transmission and reception through a wired connection with the switching system 300.

The deck base station 350 includes a physical layer (PHL) and a medium access control layer (MAC) in the deck protocol stack.

Here, the physical layer performs a function of separating a radio spectrum into physical channels in a fixed frequency and time dimension, and the MAC layer selects physical channels and connects or disconnects the selected physical channel. ), Multiplexing and demultiplexing control information into slot information packet information along with upper layer information and error control information.

In addition, the functions of the MAC layer may be classified into a cluster control function and a cell site function.

The deck base station interface board 370 communicates with the switching system 300 through an IPC interface 371 that supports communication through an interprocessor communication (IPC) protocol.

The deck base station interface board 370 also includes a resource management task 375, which manages resources.

In addition, the deck base station interface 370 communicates with the deck base station 350 through a base station interface 373 supporting communication with the deck base station 350.

The deck base station interface board 370 communicates with the deck base station 350 through a base station interface 373 supporting voice and data services through a U-line interface.

The deck base station 350 includes a DBC 359 and a TBC 357 task to form a cluster, and when the deck terminal moves, or to request a new channel setup in a fixed position. You can reduce the unnecessary load by giving a response.

Conventionally, the time required in response to the channel setup request is long, so that an error occurs in the middle of the required time, and when such an error occurs, a new channel setup for the deck terminal has to be attempted. will be.

Thus, the time until the response to the channel setup is due to a deck spec requiring no error between the channel setup and the response time to the channel setup. It is possible to evaluate the stability.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above, in the system constituting a plurality of deck base station, by optimizing the deck protocol stack to ensure the stability of the data set-up and mobility of the deck terminal and to configure a suitable wireless private exchange system to meet the user requirements It has the effect of making it possible.

In addition, according to the present invention, there is an effect to minimize the exceptional situation that can occur by placing the same load between the base station board.

Claims (5)

In a system for performing an interface between multiple deck protocol stacks, A switching system that controls allocation and release of a radio channel to a call occurring at a deck terminal, and performs call connection, maintenance, and release; A dec base station for performing voice and data communication with the dec terminal and allocating and releasing radio channels according to the control of the switching system for a call generated from the dec terminal; And And a deck base station interface for performing an interface between the switching system and the deck base station. The method of claim 1, The exchange system, A call control module for performing an input call processing; Link connection procedure of data connection control layer-C task and Lc task are set up and released, and call control and movement control task and LCE task of network layer are set up and maintained and released. A main system for exchanging messages and having a multi-bearer control task in a medium access control layer to control allocation and release of radio channels and to control multiplexing and processing of data; And And a system desk for performing interface and call control between the main system and the general switching system. The method according to claim 1 or 2, And the deck base station interface board and the deck base station communicate via a u-line interface. The method according to claim 1 or 2, The deck base station, A burst mode controller configured to transmit and receive the input voice data to and from the switching system in a predetermined time slot through a time division multiple access scheme; A physical layer separating the wireless spectrum from the physical channels in fixed frequency and time dimensions; And And a media access control layer for creating, maintaining, and releasing bearers by selecting a specific physical channel among the physical channels and accessing or disconnecting the selected physical channel under the control of the switching system. The method according to claim 1 and 2, And the media access control layer has a cluster control function and a cell site function.