KR950009400B1 - Mobile telecommunication base control device of frame relay - Google Patents

Abstract

The handover function is divided from a mobile station to reduce the load of the station when the baud rate between a base station and a mobile station is different. The apparatus includes a frame relay unit(13) for sending traffic data to frame relay network in the form of HDLC, a GPS interface and clock distributor(18) for providing a GPS clock signal to DS-1 interface unit(12), and a communication processor unit(19) for telecommunication between processors.

Description

Frame relay type mobile communication base station control device

1 is a basic diagram of a mobile communication network.

2 is a schematic diagram of a switching period network for a mobile communication base station-base station controller-mobile communication.

3 is a detailed block diagram of a base station controller.

4 is a frame relay mesh connection diagram using a high-speed IPC.

5 is a frame configuration diagram in a DS-1 format.

* Explanation of symbols for main parts of the drawings

12 ISDN primary group speed conversion and matching device 13 frame relay

14: source code conversion and base station selection device 15: time switch device

16: digital relay line matching device 17 network device

18: GSP and clock distribution device 19: high speed IPC processing device

20: main processor 21: maintenance processor

The present invention provides a base station control apparatus which reduces the load of a mobile exchange by separating a function of economically transporting a transmission path and handling a handover from the mobile exchange when the speed of data transmitted between the base station and the mobile exchange is variable. It is about.

In general, the difference between the mobile communication network and the PSTN or ISDN is that the wireless channel is used instead of the subscriber line and the subscriber moves. The radio frequency that can be used in a mobile communication network is limited, so the large area is divided into small areas called cells, and the specific frequency used in one cell is repeatedly used in another cell.

Therefore, the base station is located in one or more cells, and radio communication is performed between the base station and the mobile station. When moving between cells during a call, a special function called handover is required. Depending on how the data is sent, the system and network configuration can vary.

In general, a mobile communication network includes a mobile station (MS) (1), a base station (BS) (2), a mobile service switching center (MSC) (4), and home location registration as shown in FIG. If it consists of elements such as the HLR (Home Location Register) (5) and the Visitor Location Register (VLR) (3), CCITT Recommendation Q.1001 recommends general information on public land mobile networks. have.

SUMMARY OF THE INVENTION An object of the present invention is to load a mobile switch by separating a function of economically operating a transmission path and processing a handover function from a mobile switch when the speed of data transmitted between the base station and the mobile switch is variable in a mobile communication network configuration. It is to provide a base station control apparatus for reducing the.

In order to achieve the above object, the present invention provides an ISDN primary group speed conversion and DS-1 matching means for performing a DS-1 matching function with data received from a base station, and inputs from the ISDN primary group speed conversion and DS-1 matching means. Frame relay means for transmitting the traffic data in the form of HDLC to the frame relay network using a high-speed communication network and vocoding the traffic data through the frame relay means with PCM data to select a connection path to the base station. Source code conversion and base station selection means, time switching means for switching the PCM data output from the source code conversion and base station selection means to be connected to a relay line, and PCM data output through the time switching means. Matching and transmitting to the mobile exchange under control of the upper processor Digital trunk line matching means for performing functions, GPS matching and clock distribution means for receiving clock information from the satellite navigation apparatus and providing clocks for source code conversion and base station selection means and ISDN primary group speed conversion and DS-1 matching means; Is connected to the ISDN primary group speed conversion and DS-1 matching means, source code conversion, base station selection means, time switching means, and digital relay line matching means, and performs communication message exchange between processors, and monitors a status of a message transmission / reception channel. And a high speed interprocessor communication means for transmitting an alarm signal when a failure occurs, and connected to the high speed processor communication means for ISDN primary group speed conversion and matching means, source code conversion and base station selection means, time switching means, and digital relay line matching means. With a main processor that governs the control processors in the It features.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a basic configuration diagram of a mobile communication network, FIG. 2 is a configuration diagram of a mobile communication network according to an embodiment of the present invention, FIG. 3 is a configuration diagram of a base station control apparatus according to the present invention, and FIG. 4 is a frame using a high-speed communication network applied to the present invention. Relay mesh connection diagram.

The mobile station 1 in FIG. 1 terminates radio matching (Um) as a terminal for providing a service to a subscriber. The base station 2 receives the signals and information generated by the mobile station in the cell under its control over the radio channel and transmits them to the MSC 4 through the A interface and vice versa. The base station 2 is composed of a base transceiver station (BTS) and a base station controller (BSC), and one BSC may manage one or more BTSs.

The BTS and BSC are called Abis interfaces.

The VLR 3 is a database that temporarily stores subscriber information about a mobile station when it enters a jurisdiction. Most of the information is obtained from a home location register (HLR) when registering a location.

The information in the VLR 3 must continue to be modified as the mobile station moves and the data associated with the HLR must always remain the same.

The mobile switching center 4 provides a switching service to mobile communication subscribers by interworking with a fixed telephone network or another mobile switching system, and performs handover, roaming, and paging functions according to the mobile characteristics of the mobile station in conjunction with the VLR / HLR. Perform.

The HLR 5 is a database that stores all information on a mobile station required to provide a mobile communication service. The stored information includes location information of a mobile station, subscriber traffic, identification, additional service processing, and billing.

2 is a connection diagram of a base station controller according to the present invention, which includes a part 11 matching with a base station, a DS1 or ISDN primary group speed matching device 12 with a base station, a frame relay part 13, a vocoder, and the like. Selector portion 14, time switch 15, relay line matching portion 16, network synchronizer 17, Bokoda and PRI matching device clock supply portion 18, high speed IPC matching device 19, central processor ( 20), the maintenance processor 21, and the common line signal processing device 22.

The base station matching section 11 matches the variable traffic data vocoded from the base station and the signal related to call processing between the base station 2 and the base station controller (BSC) according to the ISDN primary group speed conversion type or DS-1 line standard. In the case of ISDN primary group matching, the source-coded voice and traffic related data are matched using the B channel, and the data for the signal is 23B + D / 30B + D recommended in CCITT I.431. Send and receive

The variable traffic data generated by the base station is not limited to 64 Kbps in the form of HDLC, and transmits and receives up to 23 channels for 1544 Kbps matching and 30 channels full capacity without channel portion for 2048 Kbps matching.

The ISDN primary group speed and DS-1 matching device 12 transmits 23B + D and 30B + D data received from the base station 2 and 23B / 30B channel data to the frame relay block 13. The D channel signal data received from the base station 2 is transferred through the ISAP (ISDN Subscriber Access Processor) control processor to perform the call control via the upper processor, and in the case of DS-1 matching, the signal data using the signal channel. Process the variable channel using the rest of the channel. In addition, the traffic data received from the frame relay 13, such as the reception clock and the reception alarm, are transmitted to the base station 2 by allocating the data for the signal input through the upper processor to the B channel and the D channel to the D channel. do.

The frame relay part 13 transmits the traffic data inputted from the ISDN primary group speed matching device to the frame relay network using the high-speed IPC network in the form of HDLC, so that the routing is performed in the frame relay network to communicate with the mobile station and the PSTN network. Input to corresponding vocoder / selector bank in source code converter and base station selector (4), vocoded to 64Kbps PCM data, input to time switch (15), and in case of communication between mobile stations, route in frame relay (3) network It is selected and transmitted to the corresponding PSI so that the called mobile station is connected to the registered base station to establish a call path.

The mesh connection diagram of the frame relay 3 network is shown in FIG.

The time switch portion 15 is connected to the PSTN via a T1 or E1 line with a mobile communication switch under the control of the upper processor, the PCM data input in the form of 64 Kbps.

The network synchronizer unit 17 extracts a reference clock from the T1 or E1 data received from the mobile switching center and supplies the time switch to the time switch for synchronization between the mobile switching center and the BSC. The subhighway clock is used, and the relay line matching device 16 uses the clock inputted from the time switch 15 as the T1 or E1 clock transmitted to the mobile exchange.

The GPS and clock distributor section 18 is a GPS matching section that receives clock information from a GPS system, a satellite navigation device, for synchronization of the mobile station and vocoder section, and a vocoder and ISDN primary group speed converter based on this clock. It is divided into clock divider that makes and supplies the necessary clock. The clock divider creates and supplies the 4MHzz and 8kHz frame sync signals required by the vocoder and the PSI.

The high speed processor communication device 19 is a device for communication between a higher processor and a lower level processor to perform communication message exchange between processors among a plurality of processors distributed, and to monitor the status of the message transmission / reception channel and to send an alarm signal when a failure occurs. Perform the function.

The BSP 20 manages the PSI, vocoder / selector, time switch and relay line matching device control processors as a higher processor. The BSMP 21 receives a warning signal reported from each block as a maintenance processor from the alarm collection device and performs maintenance functions such as prohibiting and releasing channel use under the control of the main processor.

CCS No. 7 The common line signal processing device 22, which is a matching part, converts the relaying signal between stations according to the No7 protocol to use the No.7 signaling method recommended by the CCITT as the signal between the base station controller and the mobile switching period. Transmit / receive using digital relay line channel, and signal data can communicate with mobile exchange through common line signal channel previously assigned by relay line matching device.

The digital relay line part 23 matches the base station controller and the mobile switch with the T1 or E1 bar recommended by the CCITT, and transmits and receives signals required for call processing through a channel pre-assigned for common line signaling.

3 is a detailed block diagram of a base station controller.

The base station connection part 31 is connected to the base station controller in the form of 23B + D / 30B + D according to the ISDN primary group speed conversion standard recommended in CCITT 1.431. In the PSI, the traffic channel is a frame relay network and the signal data is stored in the PSI. The common memory is shared and processed with the ISAP 33.

The frame relay network connection part 32 is configured in a full mesh form using a high-speed IPC network, and separates a transmission / reception part at a data rate of 2 Mbps to transmit and receive data, a clock, and an alarm by RS422 matching. The mesh connection of the frame relay network is configured in the form of a full mesh as shown in FIG. 4, and the connection with any base station is enabled by the corresponding address control in the frame relay network.

The frame relay network 34 is a duplicated source coding converter and a selector part 35. When a mobile station moves from a cell area to a cell area, the frame relay network 34 recognizes and selects a state of the call and passes it to the source coding converter 64Kbps PCM data. The switch is connected to a time switch device via a 2.048Mbps subhighway via a selector. At this time, maintenance functions such as fault alarm collection and testing for the selector and the source code conversion unit are performed under the control of the Vocode selection control processor (VSC) 36.

The time switch device 37 is a time switch device capable of A-law / U-law code conversion in units of channels depending on whether the digital trunk line matching is 1544 Kbps T1 or 2048 Kbps E1 matching under the control of the TSP 38, which is a time switch control processor. And a time switch device having a code conversion function previously filed by Patent Application No. 91-26066.

In this case, the time switch operation clock extracts the clock from the T1 or E1 data received from the mobile exchanger, inputs it to the network device at the reference frequency, generates a system clock synchronized with the reference frequency, and supplies it to the time switch device. This clock provides the clocks needed by the source coding converter and selector device 35 and the digital trunk line matching device.

The digital relay line matching device 39 is connected to the T1 1544 Kbps or E1 2048 Kbps matching using the T1 matching device, which was previously applied for patent application No. 89-20566, and the Patent Act No. 89-20568, using the E1 relay line matching device.

At this time, the traffic data is matched using a relay line channel, and the signal data is processed through No. 7 protocol through STG 42 and SMHP 43, which are common line signaling devices filed in Patent Application No. 88-409. It is connected to the mobile switch via the relay line matching device 40 through a nailed up path connected to the position.

The high speed IPC processing unit 41 is a communication node combining unit for combining the respective control processors to perform a communication connection between the upper processor and the lower processor, and the BSP 44 controls all the processors in the BSC with the base station controller control processor. Perform the function.

BSMP 45 is a base station controller maintenance processor that collects the failure status of each block and reports it to the BSP, and detects the abnormality according to the failure status and automatically starts or stops the operation of the maintenance function of the blocks through the BSP. Make it possible. CIP 36 is a high-speed IPC communication device control processor to perform the state control function of the communication device.

5 is a variable frame configuration diagram in the DS1 format, (a) is a configuration of the existing frame format, (b) a variable frame structure diagram in the present invention having a speed of 1544Kbps, (c) has a 2048Kbps speed The variable frame structure diagram in this invention is shown, respectively.

In the diagram (a), F is a frame sync bit, CH is a voice and data channel (64 Kbps 8 bits), F is a frame sync bit, and CH is a traffic channel. This enables channel identification.

In addition, TSO in Fig. (C) represents a synchronization channel, respectively.

Therefore, the effect obtained by the present invention, which is configured and operated as described above, provides a control device between the base station and the mobile switch in the mobile communication network to efficiently operate the transmission path and match the base stations in various ways without changing the mobile switch. It is possible to increase the efficiency of the traffic channel utilization with the base station.

Claims (3)

ISDN primary group speed conversion and DS-1 matching means 12 performing DS-1 matching function with data received from the base station, and traffic data input from the ISDN primary group speed conversion and DS-1 matching means 12. Frame relay means 13 for transmitting the data in the form of HDLC to a frame relay network using a high speed communication network, and vocoding the traffic data through the frame relay means 13 into PCM data to connect to the base station. Source code conversion and base station selection means (14) for selecting and source switching and time switching means (15) for switching PCM data outputted from the base station selection means (14) under the control of an upper processor and connecting the relay line. And a matching function of transmitting and receiving the PCM data output through the time switching means 15 to the mobile switch under the control of the upper processor. GPS matching that receives clock information from the digital trunk line matching means 16 and the satellite navigation apparatus and provides the clock necessary for source code conversion and base station selection means 14 and ISDN primary group speed conversion and DS-1 matching means 12. And clock distribution means 18, the ISDN primary group speed conversion and DS-1 matching means 12, source code conversion and base station selection means 14, time switching means 15, and digital trunk line matching means 16; It is connected to the high-speed processor communication means 19 and the high-speed processor communication means 19 for performing a communication message exchange between the processors, and performs a function of monitoring the status of the message transmission and reception channel and alarm signal transmission in the event of a failure, and the high speed processor communication means 19 And control processors in the ISDN primary group speed conversion and matching means 14, source code conversion and base station selection means 14, time switching means 15, and digital trunk line matching means 16. Mobile communication base station control device comprising the processor 20. The apparatus of claim 1, wherein the frame relay means (13) has a full mesh structure. The apparatus of claim 1, further comprising a network synchronizer unit (17) for extracting a reference clock from the T1 and E1 data provided from the digital relay line matching unit (16) and supplying the reference clock to the time switching unit (15). Mobile communication base station control device characterized in that it comprises.