KR19980052726A - Service channel automatic switching method and device in satellite communication system - Google Patents

Abstract

The present invention relates to a method and apparatus for automatically switching service channels in a satellite communication system to automatically switch a service channel of a base station by searching for a base station having the highest failure rate for a call connection attempt at a predetermined time interval. On the basis of each base station information obtained by polling, a call failure attempt rate of a base station using each service channel is calculated, and a failure rate for each service channel is calculated according to the calculation result, and the failure rate information for each service channel confirmed as a result of the calculation and the Based on the call access attempt failure rate for each base station identified in the call connection attempt failure rate calculation step, the base station using the service channel with the lowest failure rate and the service channel with the highest failure rate is searched for the base station with the highest failure rate. Channel allocation information with the lowest failure rate Characterized in that the update to set to channel information.

Description

Service channel automatic switching method and device in satellite communication system

The present invention relates to a satellite communication system. In particular, the service channel automatic switching in the satellite communication system to automatically switch the service channel of the base station by searching for the base station having the highest failure rate for a call connection attempt at a predetermined time interval. A method and apparatus therefor.

The channel allocation operation in the satellite communication system mainly used for remote communication is to be performed by the central station managing the overall network operation state, Figure 1 illustrates the channel assignment process in the DAMA-SCPC satellite communication system This is a schematic block diagram of a central station.

In FIG. 1, reference numeral 10 denotes an antenna for transmitting and receiving an uplink signal transmitted to a satellite (not shown) and a downlink signal transmitted from a satellite, and 20 denotes an antenna 10. RF transmission / reception for converting the downlink signal of the ultra-high frequency band received by the to an intermediate frequency (IF) signal and converting and outputting the intermediate frequency (IF) signal of the 70 MHz band to the RF signal of the ultra-high frequency band in reverse for the uplink signal. However, the RF transceiver 20 is an Orthogonal Mode Transducer (OMT) 21 that separates and inputs and outputs up and down link signals transmitted and received through the antenna 10 by using a polarization property of frequency. ) And the 12.25 to 12.75 GHz downlink frequency signal separated and input by the orthogonal mode converter 21 to a predetermined level, and the amplified signal is for example an intermediate frequency (IF) of 70 MHz. RF receiver 22 for converting the signal and RF transmitter for converting the 70 MHz intermediate frequency (IF) signal to be transmitted to the satellite into 14.0 to 14.5 GHz microwave and amplifying the signal to a predetermined level to generate an uplink frequency signal. It consists of (23).

Further, reference numeral 30 denotes an IF processing stage for processing a transmission / reception intermediate frequency (IF) signal in a 70 MHz band, and the IF processing stage 30 receives an intermediate frequency (IF) signal applied from the RF receiver 22. Intermediate frequency combination / distribution unit for separating and outputting a plurality of intermediate frequency signals and outputting a combination of intermediate frequency signals applied from a single channel per carrier (SCP) channel unit (SCU) 33 to be described later. C / D) 31 and the first SCPC channel unit for demodulating, decoding and outputting the IF signal applied from the intermediate frequency combination / distributor 31 and the message output from the network controller 40 to be described later. It consists of a second SCPC channel unit 33 which is encoded, modulated and output.

Further, reference numeral 40 performs a polling function for checking the state of each base station based on a response message transmitted from the base station after transmitting a control message to each base station through the SCPC channel unit 33, and a specific base station If there is a call request from the base station, the base station determines whether the other base station is in a communication state based on the information obtained in the polling process, and if the communication state is available, allocates available traffic channels of the satellite to both base stations. This is a network control unit that performs system control such as allowing direct communication with each other.

On the other hand, the network controller 40 extracts packet information from a message applied from the processor 41 and the SCPC channel unit 32, which controls the entire system and in particular, the call processing between the base stations. In addition, a service channel controller (SCC) 42 for generating and outputting a message of a time division multiplex (TDM) stream to the SCPC channel unit 33 and a service with the processor 41. Dual port RAM 43 for data transmission and reception between the channel controller 42, the program storage unit 44 in which the operation program of the processor 41 is stored, and the status information of each base station obtained by the above-described polling operation The base station information storage unit 45 is stored, and the channel information storage unit 46 stores the usage state of the communication channel.

In addition, reference numeral 50 denotes a network management system that enables the satellite communication network operation manager to monitor the overall network operating status and to control the entire satellite system including the base station as necessary.

That is, in the conventional satellite system having the above-described configuration, when there is a call setup request from any subscriber base station (not shown), the base station information obtained by polling by the processor 41 inside the network control unit 40 is polled. And allocating a channel having a requested bandwidth among currently available communication channels based on the channel state information recorded in the channel information storage unit 46.

Meanwhile, in the recently developed DAMA-SCPC satellite communication system, DSS-1000, a service data network (SDN) comprising one TDM channel and four slotted Aloha (S / A) channels for transmitting control signals between a base station and a central station Data Network). The central station transmits the control signal to each base station through the TDM channel, and each base station transmits the control signal and channel assignment request message to one of the four S / A channels through the S / A channel assigned to the local station. do.

Each S / A channel (hereinafter, referred to as a service channel) of the service data network (SDN) is divided into 18 time slots and is operated so that several base stations share the same, simultaneously for the same service channel. When there is a request for channel allocation from several base stations, a collision occurs and an efficient network operation is difficult.

The present invention was created in view of the above circumstances, and the service channel in the satellite communication system to automatically switch the service channel of the base station by searching for the base station having the highest failure rate for the call connection attempt at a predetermined time interval. An object of the present invention is to provide an automatic switching method and a device thereof.

1 is a view for explaining a channel allocation process of a typical satellite communication system.

Figure 2 is a block diagram schematically showing the configuration of a satellite communication system with a service channel automatic switching function according to an embodiment of the present invention.

FIG. 3 is a flow chart for explaining the operation of the apparatus in the configuration of FIG. 2. FIG.

******** Explanation of symbols for the main parts of the drawing ********

10: antenna 20: RF transceiver

21: Orthogonal Mode Transducer (OMT)

22: RF receiver 23: RF transmitter

30: IF processing stage 31: intermediate frequency combination / distribution unit (IF C / D)

32, 33: SCPC channel unit 40, 140: network control unit

41,141: Processor

42: Service Channel Controller (SCC)

43: Dual Port RAM 44: Program Storage

45: base station information storage unit 46: channel information storage unit

50: network management system 147: call connection request failure rate calculation unit

148: failure rate storage unit for each SDN channel 149: SDN information storage unit for each base station

In the satellite communication system according to the first aspect of the present invention for realizing the above object, a method for automatically switching a service channel calculates a call connection failure rate of a base station using each service channel based on each base station information obtained by polling. The failure rate calculation step for each channel calculates the failure rate for each service channel according to the operation attempt failure rate calculation step, the operation result value for the call connection failure rate, the failure rate information for each service channel identified in the failure rate calculation step for each channel, and the call The search for the poorest station among the base stations using the service channel with the lowest failure rate and the service channel with the highest failure rate based on the call connection attempt failure rate for each base station identified in the access attempt failure rate calculation step, and the least-satisfactory station The service channel allocation information of the poorest failure rate indexed in the And a service channel switching step of updating and setting the service channel information having the lowest failure rate.

In addition, the automatic switching of the service channel in the satellite communication system according to the second aspect of the present invention, a plurality of base stations each coupled with a plurality of subscribers, satellites for providing a call channel between each base station, and a base station with a call request A satellite communication system having a central control station for assigning and controlling an available communication channel of a satellite for a satellite communication system; The central control station includes base station information storage means for storing state information of each base station obtained by a polling operation, and call connection request failure rate calculating means for calculating a failure rate for a call connection attempt based on the setting data of the base station information storage means. A failure rate storage means for each SDN channel, which updates and stores the failure rate for each SDN channel calculated by the call connection request failure rate calculation means at each calculation time point, and stores the SDN information for each base station that stores information of service channels assigned to each base station. The base station having the highest failure rate among the service channels having the highest failure rate based on the data set in the failure rate storage means for each SDN channel and the SDN information storage means for each base station, and the service channel allocation information of the base station is determined. Control means for controlling to update and set the frequency information of the lowest service channel And it characterized in that configured.

That is, according to the present invention having the above-described configuration, it is possible to prevent the excessive load due to the concentration of the use request for a specific service channel and to distribute the collision between base stations generated during the call connection request to four service channels. By solving this problem, more effective network management can be realized.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

FIG. 2 is a block diagram schematically illustrating a satellite communication system having a service channel automatic switching function according to an embodiment of the present invention. Referring to the same elements as those shown in FIG. The numbers are omitted and the detailed description thereof is omitted.

In FIG. 2, reference numeral 147 denotes a call connection request failure rate calculating unit that calculates a failure rate according to a call connection request periodically at regular intervals based on the setting data of the base station information storage unit 45 obtained by polling, and 148 is described later. A failure rate storage unit for each SDN channel which updates and stores the failure rate for each SDN channel calculated by this call connection request failure rate calculation unit 147 at every calculation point, under the control of the processor 141, and 149 is a service allocated to each base station. SDN information storage unit for each base station that stores channel information.

In addition, the reference numeral 141 controls the overall system and also the failure rate among the service channels having the highest failure rate based on the data set in the failure rate storage unit 148 for each SDN channel and the SDN information storage unit 149 for each base station. The processor searches for a service channel having the highest base station and the lowest failure rate and controls the switching operation of the service channel according to the search result.

Next, the operation of the apparatus having the above-described configuration will be described with reference to the flowchart of FIG.

The processor 141 inside the network control unit 140 stores and sets the information of each base station obtained by a regular polling operation in the base station information storage unit 45. The service channel usage information for each base station is read from the base station information storage unit 45, and the call connection attempt failure rate for the base stations using each SDN channel is calculated by the call connection request failure rate calculating unit 147. (ST 1 ST 3)

Subsequently, the processor 141 updates and stores the data of the failure rate storage unit 148 for each SDN channel based on the result value calculated by the call connection request failure rate calculator 147. (ST 4)

On the other hand, the processor 141 reads the updated data of the failure rate storage unit 148 for each SDN channel and the data of the SDN information storage unit 149 for each base station, and based on this, even among the base stations using the service channel having the highest failure rate. The base station having the highest failure rate (hereinafter referred to as the poorest station) and the service channel having the lowest failure rate are searched (ST 5).

Then, the processor 141 automatically updates the service channel of the poorest station by updating the service channel allocation information of the poorest station confirmed as a result of the search in step 5 with the frequency information of the service channel having the lowest failure rate.

On the other hand, the service channel automatic switching operation described above is executed periodically every predetermined time. As a result, it is possible to realize more effective network management by distributing and eliminating collisions between base stations generated when a call connection is requested to four service channels. do.

That is, according to the embodiment, it is possible to automatically switch the service channel of the base station by searching for the base station having the highest failure rate for the call connection attempt at a predetermined time interval.

On the other hand, the present invention is not limited to the above embodiments and can be modified in various ways without departing from the technical gist of the present invention.

As described above, according to the present invention, it is possible to prevent excessive load due to the concentration of use requests for a specific service channel and to disperse by distributing the collision between base stations generated in a call connection request to four service channels. By doing so, more effective network management can be realized.

Claims (2)

A call connection attempt failure rate calculating step of calculating a call connection attempt failure rate of a base station using each service channel based on each base station information obtained by polling; Calculation of failure rate by channel, which calculates failure rate by each service channel according to operation result of call failure attempt rate, The service channel having the lowest failure rate and the service channel having the highest failure rate are based on the failure rate information for each service channel identified in the failure rate calculation step for each channel and the call connection attempt failure rate for each base station confirmed in the call connection failure rate calculation step. Search for the least developed countries that searches for the highest failure rate among the base stations used, and And a service channel switching step of updating and setting the service channel allocation information of the failure rate indexed in the least developed station to the service channel information having the lowest failure rate. A satellite communication system having a plurality of base stations, each of which is combined with a plurality of subscribers, a satellite for providing a call channel between each base station, and a central control station for allocating and controlling the available call channels of the satellites to the base stations with call request. To; The central control station includes base station information storage means for storing state information of each base station obtained by a polling operation; Call connection request failure rate calculating means for calculating a failure rate for a call connection attempt based on the setting data of the base station information storage means, Failure rate storing means for each SDN channel for updating and storing the failure rate for each SDN channel calculated by the call connection request failure rate calculating means at every calculation point; SDN information storage means for each base station for storing the information of the service channel assigned to each base station, and Based on the data set in the failure rate storage means for each SDN channel and the SDN information storage means for each base station, a base station having the highest failure rate is searched among service channels having the highest failure rate, and the service channel allocation information of the corresponding base station has the lowest failure rate. An apparatus for automatically switching service channels in a satellite communication system, comprising: control means for controlling the channel to be updated with frequency information of a channel.