KR100231784B1 - Central multiplexer for satellite transmission system pager - Google Patents

Abstract

[Technical field to which the invention described in the claims belong]

Wireless Call Data Satellite Transmission System

[Technical Challenges to Invent]

In the conventional radio call data satellite transmission system, since the master center station and the preliminary center station are combined 1: 1, it is impossible to construct a wide area film, and if the rainfall, snowfall or fatal damage of the transmission equipment occurs, the satellite link between the center pole and the base station It is to solve the problem that it is impossible to carry out the continuous wireless paging service.

[Summary of the solution of the invention]

The master central station of 8 stations that multiplexes the signals of the radio call exchanger to generate multiplexed data, and provides the wide area radio call data satellite transmission service: If a problem occurs in the master central station, the multiplexed data is transferred to the spare central station, and the reserve center station. It is characterized by consisting of a preliminary central station that transmits self-weighting data by unmuting up to four modulators and provides a wide area wireless calling data satellite transmission service.

[Important Uses of the Invention]

It is applied to radio calling data satellite transmission system and wired network system.

Description

Central Station Multiplexer Apparatus for 8: 4 Site Diversity in Wide Area Network Radio Data Satellite Transmission System

The present invention uses a multiplexer and a high speed modem of 8: 4 site diversity in a radio call data satellite transmission system. In this case, by switching the multiplexed data to a preliminary central station, unmute up to four modulators simultaneously so that the paging service can be continued without interruption. It is an object of the present invention to provide a central station multiplexer device and a method thereof.

[Technical Field of the Invention and its Prior Art]

In general, a radio call data satellite transmission system is a system for performing a radio call service by transmitting data by a radio call exchanger by setting a path between base stations in a switching center (TDX-PS).

In such a radio call data satellite transmission system, a conventional central station multiplexer device, as shown in Figure 1, PCIB unit for digitally changing the frequency shift keying (FSK) analog paging signal of the paging exchange unit 11; (Paging Central Interface Block) 12; A QSP unit (Qusp Synchronous Processor) 13, which synchronizes the clocks of the channel input / output data of the PCIB unit 12, compensates for the deviation between the system clock and the reception clock, and comprises four synchronous data channels; An NCL (Network Control Logic) unit responsible for controlling the multiplexer system; An ILC unit (Intermachine Link Module) 15 connected to the QSP unit 13 to process data and voice between a channel and an intermachine link; Local and master PCCB units reporting the control status of the PCIB unit 12, the NCL unit 14, and the modulation unit 20, and in charge of a communication channel with the network management system 18. Control Block (16) (17); Network management unit 18 for managing the central station and base station of the radio call data satellite transmission system.

The operation of the central station multiplexer device of the conventional radio call data satellite transmission system configured as described above will be described below.

First, the attenuation of the satellite data signal due to rainfall or snowfall is detected through a beacon receiver, a component of the receiving equipment. When the attenuation of the satellite link deteriorates above the reference value, radio call multiplexing data is transmitted to the satellite. You will not be able to.

In order to solve this problem, a method of compensating for signal attenuation using UPC (Uplink Power Controller) has been used.However, when signal degradation due to heavy rainfall or snowfall exceeds the compensation capability of UPC, the quality of radio call data satellite transmission through satellite It is degraded and the satellite link between the central station and the base station is broken, so that continuous service cannot be performed.

In addition, even when a fatal defect occurs in the transmission equipment of the central station, there is a disadvantage that radio call data cannot be transmitted to the satellite until repair or replacement of the damaged equipment.

In addition, since the failure of the master central station can transmit radio call multiplexing data from the preliminary central station that receives the multiplexer multiplexing data to the satellite, it is configured as a duplication of 1: 1 site diversity so that the service can be continued without interruption. The 1: 1 site diversity of the conventional radio call data satellite transmission system has a limitation in that a wide area network cannot be formed by combining a master center and a preliminary center in a 1: 1 ratio.

Accordingly, the present invention has been proposed to solve various problems that occur when providing a wireless paging service in the general wireless paging data satellite transmission system as described above, and an object of the present invention is 8: 4 sites in the paging satellite data transmission system. Diversity Central Station Multiplexer Using High Speed Modem When a critical problem occurs on the transmission equipment or when the signal attenuation due to rainfall / snowfall exceeds the standard, the multiplexing data is transferred to the preliminary central station to unmute up to four modulators simultaneously. The present invention provides a central station multiplexer device and method thereof for 8: 4 site diversity of a wide area network wireless data satellite transmission system in which the network continues without interruption.

Technical means for achieving the object of the present invention,

A master central station of eight locations which multiplexes signals of a radio call exchanger to generate multiplexed data and provides a wide area radio data satellite transmission service; When a problem occurs in the master central station, the multiplexed data is transferred to the preliminary central station, and the multiplied data is transmitted by unmuting up to four modulators of the preliminary central station, and the preliminary central station providing a wide area radio calling data satellite transmission service.

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

1 is a block diagram of a central station multiplexer device of a conventional radio call data satellite transmission system;

2 is a block diagram of a central station multiplexer device for 8: 4 site diversity in a wide area network wireless data satellite transmission system according to the present invention;

3 is a detailed configuration diagram of a wide area network wireless data satellite transmission system of FIG. 2;

4 is a flowchart illustrating a multiplexing data transfer operation of a central station multiplexer for 8: 4 site diversity in a wide area network wireless data satellite transmission system according to the present invention.

* Explanation of symbols for the main parts of the drawings

100: master central station multiplexer 110: master central station modulator

120: master central station high speed modem 900: preliminary central station multiplexer

910: reserve central station modulator 920: reserve central station high speed modem

2 is a block diagram of a central station multiplexer device for 8: 4 site diversity of a wide area network wireless data satellite transmission system according to the present invention.

As shown, the master central station of eight locations multiplexes the signals of the radio call exchanger to generate multiplexed data and provides a wide area radio data satellite transmission service; When a problem occurs in the master central station, the multiplexed data is transferred to the preliminary central station, and unmuted up to four modulators of the preliminary central station to transmit the multiplexed data, and is configured as a preliminary central station providing a wide area wireless data satellite transmission service.

The master central station includes: a master central station multiplexer (100) for multiplexing signals of a radio call exchanger to generate multiplexed data; A modulation unit (110) for modulating the multiplexed data of the master central station multiplexer (100) and transmitting it to a satellite; A modulator (110) for modulating the master central station multiplexed data and transmitting the modulated data to a satellite; When the multiplexing line of the master central station multiplexer 100 is switched, the high-speed modem 120 modulates the multiplexed data synchronized with a clock provided from a telephone station network to a DPSK (Differential Phae Shift Key) signal and transmits the data to a spare central station through a dedicated line. It is composed.

In the above, the master central station multiplexer 100 includes: a PCIB unit 102 for converting the FSK analog paging signal of the paging exchange unit 101 into digital, as shown in FIG. A QSP unit 103 for synchronizing the clocks of the channel input / output data of the PCIB unit 102, compensating for the deviation between the system clock and the reception clock, and comprising four synchronous data channels; An NCL unit 104 in charge of controlling the master central station multiplexer system; It is connected to the QSP unit 103 and the high speed modem 120, is connected to the ILC unit 103 and the high speed modem 120 to multiplex the data of the QSP unit 103, and the data of the QSP unit 103. An ILC unit 105 for multiplexing the multiplexes; Local and master PCCB units 106 and 107 in charge of control and status reporting of the PCIB 102, the NCL unit 104, the modulation unit 110, and the network management unit 108; A network manager 108 for managing the central station and base station of the radio call data satellite transmission system; It is responsible for communication between the network management unit 108 of the master central station and the network management unit 904 of the preliminary central station at a speed of 9,600 bps, and transmits a mute / unmute control signal of the master central station modulation unit 110. And a modem 109 to receive.

The preliminary central station may include a preliminary Chinese multiplexer 900 capable of receiving multiplexed data of up to 4 locations from the master central station; A preliminary central station modulator 910 for modulating the multiplexed data of the preliminary central station multiplexer 900 and transmitting the modulated data to a satellite; The high speed modem 120 of the master central station receives the multiplexed data on a dedicated line and is configured as a preliminary central station high speed modem 920 for transmitting to the preliminary central station multiplexer 900.

The preliminary central station multiplexer (900) includes: an NCL unit (901) in charge of controlling the preliminary central station multiplexer system; An ICL, which is composed of a plurality of four pairs under the control of the NCL unit 901, is connected to the preliminary central station modulator 910 and the preliminary center station high speed modem 120, and processes data and voice of the QSP unit 103. Section 902; A BPM unit 903 for routing the channel of the master central multiplexer 100 to the channel of the reserve central multiplexer 900; A network manager 904 for overall management of the control and status of the preliminary central station; Multiple modems 905 for transmitting / receiving data between the network management unit 108 of the master central station and the network management unit 904 of the preliminary central station and transmitting a mute / unmute control signal to the preliminary central station modulation unit 910. It is composed of

Referring to the accompanying drawings, the operation of the central station multiplexer device for 8: 4 site diversity of the wide area network wireless data satellite transmission system according to the present invention configured as described above is as follows.

First, the network management unit 208 monitors the status of the master central station and determines whether a fatal problem of the transmission equipment occurs or exceeds the reference value in the master central station (STI), so if there is no abnormality in the master central station, the signal of the radio call exchanger is processed. To transmit the multiplexed data through the modulator 110.

If a failure occurs in the master central station, the system clock fault replacement list of the master central station multiplexer 100 is moved from DLT (Data Link Trasmitter) 03 or DLT04 to DLT17 to disconnect the modulation unit 110 connected to DLT03, and the high-speed modem connected to DLT17. The multiplexed data is transferred to step 920 (ST3-ST5). Then, the network management unit 904 of the spare central station connected through the network management unit 108 of the master central station and the dedicated line modems 109 and 905 of 9600 bps is notified of the problem of the master central station and services the multiplexed data of the master center station from the spare central station. When switching the multiplexed data, the system clock is automatically switched to the DLT17 connected to the telephone station network so that the multiplexed data is synchronized to the system clock provided by the telephone station network and transmitted to the multiplexer of the preliminary central station through the high speed modem 120. (ST6) (ST7)

Accordingly, when the multiplexed data of the master center stations of 8 stations are transferred to the preliminary center station, the modulator 110 of the master center station having a service problem by the network management unit is muted, and the radio data transmission is stopped. The 910 is unmuted to transmit the multiplexed data transferred from the master central station to the spare central station. The routing table of the master central multiplexer 100 sets the path delay to 1 for DLT17 so that the multiplexed data of the master central multiplexer 100 is linked to the base station demultiplexer via the spare master multiplexer 900. . In addition, the delay threshold (Delay Threshold) of the multiplexer channel module (QSP) connected to the PCIB unit 102 is also set to 1 so that the paging data of the master central station is linked to the base station demultiplexer via the preliminary central station multiplexer 900.

On the other hand, if the problem occurring in the master central station is solved, the multiplexed data transferred to the preliminary center multiplexer 900 should be returned to the master central station multiplexer 100 again. Therefore, when the DLT17 of the master central station multiplexer 100 is reset, the system fault replacement list is switched to the DLT03 so that the master central station can transmit the multiplexed data to the base station.

As such, the implementation of 8: 4 site diversity will provide a wide area network consisting of eight master center stations and one reserve center station.

As described in detail above, the present invention uses a central station multiplexer and a high-speed modem of 8: 4 site diversity in a radio call data satellite transmission system to form a wide area network including eight master center stations and one reserve center station nationwide. It can work.

In addition, the multiplexed data of the master central station that caused the severe damage of rainfall, snowfall or transmission equipment can be transferred to the redundant central station through 128Kbps dedicated line to simultaneously transmit the multiplexed data of the maximum four master central stations from the redundant central station. The quality of radio calling service is improved.

Claims (5)

A master central station of eight locations which multiplexes signals of a radio call exchanger to generate multiplexed data and provides a wide area radio data satellite transmission service; When a problem occurs in the master central station, the multiplexed data is transferred to the preliminary central station, and the preliminary central station unmutes up to four modulators to transmit the multiplexed data, and is configured as a preliminary central station for providing a wide area radio calling data satellite transmission service. A central station multiplexer device for 8: 4 site diversity of a wide area network wireless data satellite transmission system; The control unit of claim 1, wherein the master central station modulates the multiplexed data of the master central station multiplexer 100 and the master central station multiplexer 100 to multiplex the signals of the wireless call exchanger and transmits the multiplexed data to the satellite. 110) and the high-speed modem 120 that modulates the data synchronized with the clock provided from the telephone station network to the DPSK (Differential Phase Shift Key) signal when the multiplexing line of the master central station multiplexer (100) and the master line multiplexer (100) is transferred to the reserve central station through the dedicated line. A central station multiplexer device for 8: 4 site diversity of a wide area network wireless data satellite transmission system, comprising: The method of claim 2, wherein the master central multiplexer 100, PCIB (Pahing Center Interface Block) 102 for converting the frequency shift keying (FSK) analog paging signal of the paging exchange unit 101 and the digital; Synchronizing the clock of the channel input and output data of the unit 102, compensate for the deviation between the system clock and the receiving clock, and the QSP unit (Qusd Synchronous Processor) 103 consisting of four synchronous data channels and the master central station multiplexer system An ILC unit (Intermachine Link Module) which is connected to an NCL unit 104 which is in charge of control, the QSP unit 103 and the high speed modem 120, and multiplexes data of the QSP unit 103. 105 and the local and master PCCB units 106 and 107 in charge of control and status reporting of the PCIB 102, the NCL unit 104, the modulator 110, and the network manager 108. Headquarters and base station of call data satellite transmission system It is in charge of communication at a speed of 9,600bps between the network management unit 108 and the network management unit 108 of the master central station and the network management unit 904 of the preliminary central station, and the mute / unmute of the master central station modulation unit 110 ( A central station multiplexer device for 8: 4 site diversity of a wide area network wireless data satellite transmission system, comprising: a modem (109) for transmitting / receiving control signals. 2. The multiplexer of claim 1, wherein the preliminary central station modulates the multiplexed data of the preliminary center multiplexer 900 and the preliminary center multiplexer 900 capable of receiving multiplexed data of up to 4 locations from the master central station. A preliminary central station headflap receiving the multiplexed data from the high speed modem 120 of the master central station and the preliminary central station modulator 910 for modulating the multiplexed data of the 900 and the preliminary central station multiplexer 900 to the satellite; A central station multiplexer device for 8: 4 site diversity of a wide area network wireless data satellite transmission system, comprising a preliminary central station high speed modem (920) for transmitting to a mobile station (900). The preliminary central station multiplexer (900) is connected to an NCL unit (901), the preliminary center station modulation unit (910), and the preliminary center station high speed modem (120) which are in charge of controlling the preliminary center station multiplexer system. By Pase module 903, the ILC unit 902 for multiplexing the data of the QSP unit 103 and the channel of the master central station multiplexer 100 are routed to the channels of the preliminary center multiplexer 900. And data between the network management unit 904 in charge of the status and control of the preliminary central station, the network management unit 108 of the master central station and the network management unit 904 of the preliminary central station, and the preliminary central station modulator 910. Central station multiplex for 8: 4 site diversity of wide area network radio data satellite transmission system comprising a plurality of modems 905 for transmitting / receiving mute / unmute control signals Device.

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