KR19990004521A - Central Station Multiplexer Apparatus for 8: 4 Site Diversity in Wide Area Network Radio Data Satellite Transmission System - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Wireless Call Data Satellite Transmission System

2. The technical problem to be solved by the invention

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

3. Summary of Solution to Invention

Multiplexing data is generated by multiplexing the signals of the radio call exchanger, and when a problem occurs in the master central station and the master central station providing wide area radio calling data satellite transmission service, the multiplexed data is transferred to the redundant central station. It is characterized by consisting of a preliminary central station that unmutes up to four modulators to transmit multiplexed data and provides wide area radio calling data satellite transmission service.

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

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 reporters at a switching center (TDX-PS).

In the radio call data satellite transmission system, the conventional central station multiplexer device, as shown in Figure 1, PCIB unit for converting the frequency shift keying (FSK) analog paging signal of the paging exchange unit 11 to digital (Paging Centra1 Interface Block) 12; A QSP unit (Quad 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 unit (Network Control Logic) 14 which is in charge of controlling the anomaly 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.

Referring to the accompanying drawings the operation of the central station multiplexer device of the conventional radio call data satellite transmission system configured as described above is as follows.

First, the attenuation of the satellite data signal due to rainfall or snowfall is carried out through a beacon receiver, which is a component of the receiving equipment. When the attenuation of the satellite link deteriorates above the reference value, the radio call multiplexed data is transmitted to the satellite. It becomes impossible.

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 fatal defects occur in the transmission equipment of the central station, there is a disadvantage in that radio call data cannot be transmitted to the satellite until repair or replacement of the damaged equipment.

In addition, in the case of a master center station failure, the service is continued without interruption by configuring the duplication of 1: 1 site diversity so that the radio call multiplexing data can be transmitted from the preliminary central station that receives the multiplexer multiplexing data to the satellite. The 1: 1 site diversity of the radio call data satellite transmission system has a problem 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. By using the diversity center station multiplexer and the high-speed modem of the diversity, when the critical problem of the transmission equipment occurs or when the signal attenuation caused by the rainfall / snowfall exceeds the standard value, the multiplexed data is transferred to the standby center 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 radio calling service continues without interruption.

Technical means for achieving the object of the present invention, the multiplexing signal of the wireless paging switch to generate multiplexed data, and to provide a wide area radio data satellite transmission service to the master central station; 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, the present invention will be described in detail with reference to the accompanying drawings.

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 of 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.

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 multiplexer 110: master central station modulation

120: master central station high-speed modem 900: spare central station multiplexer

910: spare central station modulator 920: spare 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 modulator (110) for modulating and transmitting the multiplexed data of the master central station multiplexer (100) 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 the clock provided from the telephone station network to a DPSK (Differential Phase Shift Key) signal and transmits the same to the spare central station through a dedicated line. It is composed.

In the above, the master central 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. Synchronizing the clocks of the channel input / output data of the PCIB unit 102, compensating for the deviation between the system clock and the receiving clock, and comprising a QSP unit 103 composed of four synchronous data channels; and controlling the master central station multiplexer system. NCL unit 104 in charge; An ILC unit (105) connected to the QSP unit (103) and the high speed modem (120) to multiplex the data of the QSP unit (103); 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; A network manager 108 for managing the central station and the device station of the radio call data satellite transmission system; It is in charge of communication at the speed of 9,600bps between the network management unit 108 of the master central station and the network management unit 904 of the preliminary central station, and transmits a mute / unmute control signal of the master central station modulation unit 110. And a modem 109 to receive.

The preliminary center station may include: a preliminary center station multiplexer 900 capable of receiving multiplexed data of up to 4 locations from the master center station; A preliminary central station modulator (910) for modulating and transmitting the multiplexed data of the preliminary center multiplexer (900) 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 ILC which consists of a plurality of four pairs under the control of the NCL unit 901 and 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 spare central station and transmitting mute / unmute control signals 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 108 monitors the state of the master central station and determines whether a fatal problem of the transmission equipment occurs in the master central station or whether the signal attenuation exceeds the reference value (ST1). Thus, if there is no abnormality in the master central station, the signal of the wireless call exchanger is processed and transmitted 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 Transmitter) 03 or DLT04 to DLT17 to disconnect the modulator 110 connected to DLT03, and the high-speed modem connected to DLT17. The multiplexed data is switched to 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. Unmute the modulator 110 of the master central station to enable it. That is, when the multiplexed data is transferred to the high speed modem (120, 920) of 128 Kbps, 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. Is transmitted to the multiplexer of the preliminary central station through the modulator 910 (ST6).

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 multiplexer 100 sets the path delay to 1 for the DLT17 so that the multiplexed data of the master centralized multiplexer 100 is linked to the base station demultiplexer via the preliminary centralized multiplexer 900. . In addition, the natural 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 to transmit the multiplexed data from the master central station 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. There is an effect that can be configured.

In addition, the multiplexed data of the master central station that caused the severe damage of rainfall, snowfall, or transmission equipment is transferred to the preliminary central station through the 128Kbps dedicated line so that the multiplexed data of the maximum master central station 4 stations can be simultaneously transmitted from the preliminary central station. And the quality of the wireless call service is improved.

Claims (5)

A master central station of eight locations that 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 predominantly composed of a 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 providing a wide area radio calling data satellite transmission service. Central station multiplexer device for 8: 4 site diversity of wide area network wireless data satellite transmission system. The master central station of claim 1, further comprising: a master central station multiplexer (100) for multiplexing signals of a radio call exchanger to generate multiplexed data; A modulator (110) for modulating and transmitting the multiplexed data of the master central station multiplexer (100) 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 the clock provided from the telephone station network to a DPSK (Differential Phase Shift Key) signal and transmits the same to the spare central station through a dedicated line. A central station multiplexer device for 8: 4 site diversity in a wide area network wireless data satellite transmission system, characterized in that configured. The master master station multiplexer (100) includes: a paging center interface block (PCI) unit (022) for converting a frequency shift keying (FSK) analog paging signal of the paging exchange unit 101 into digital; A QSP unit (Quad Synchronous Processor) 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 (104) for controlling the master central station multiplexer system; An ILC unit (Intermachine Link Module) 105 connected to the QSP unit 103 and the high speed modem 120 and multiplexing data of the QSP unit 103; Local and master PCCB units 106 and 107 in charge of control and status reporting of the PCIB 110, 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 in charge of communication at a speed of 9,600bps between the network management unit 108 of the master central station and the network management unit 904 of the preliminary central station, and transmits a mute / Unmute control signal of the master central station modulation unit 110. And a central station multiplexer device for 8: 4 site diversity of a wide area network wireless data satellite transmission system, characterized in that it comprises a receiving / receiving modem (109). The apparatus of claim 1, wherein the preliminary central station comprises: a preliminary central station multiplexer 900 capable of receiving multiplexed data of up to 4 locations in the master center play; A preliminary central station modulator 910 for modulating the multiplexed data of the preliminary center multiplex 900 and transmitting the modulated multiplexed data to a satellite; 8 of the wide area network radio call data satellite transmission system comprising a preliminary central station high speed modem (920) for receiving multiplexed data from a high speed modem (120) of the master central station on a dedicated line and transmitting the multiplexed data to a preliminary central station multiplexer (900). Central station multiplexer unit for four-site diversity. The apparatus of claim 4, wherein the preliminary central station multiplexer (900) comprises: an NCL unit (901) for controlling the preliminary center station multiplexer system; An ILC unit 902 connected to the preliminary central station modulator 910 and the preliminary center station high speed modem 120 and multiplexing data of the QSP unit 103; A By Pass Module (903) for allowing the channel of the master central multiplexer (100) to be routed to the channel of the reserve central multiplexer (900); A network manager 904 in charge of status and control of the preliminary central station; A modem 905 including a plurality of modems for transmitting a data frame between the network management unit 108 of the master central station and the network management unit 904 of the preliminary central station, and transmitting / receiving a mute / unmute control signal to the preliminary central station modulator 910. A central station multiplexer device for 8: 4 site diversity of a wide area network wireless data satellite transmission system, comprising: