KR20000020182A - Method for allocating channel of transponder in satellite communication system and apparatus therefor - Google Patents

Abstract

PURPOSE: A method for allocating a channel of a transponder manages a waste channel generated by a channel allocation of a transponder channel allocation responsive to a mirrored method as a specific usage, according to the number of channels required by a data transmission characteristic, and prevents a channel waste of a transponder. CONSTITUTION: A method for allocating a channel of a transponder allocates a channel of a transponder to a terminal station by a mirrored method by using a satellite, and forms a communication path between both terminals. The method divides a waste channel as a specific channel usage according to TDM channel and S/A channel. The method stores a channel information according to a channel usage to a predetermined memory, and determines whether the received channel allocation requirement data is a traffic channel allocation requirement data. If the received channel allocation requirement data is not the traffic channel allocation requirement data, the method determines whether there is a channel allocation information data in a memory of a corresponding channel usage divided in the channel usage division setting step. If the corresponding channel area is allocated, the method allocates a channel of a corresponding channel area. Thereby, a channel waste is prevented.

Description

Transponder Channel Allocation Method and Apparatus in Satellite Communication System

The present invention relates to a communication system using satellites, and in particular, by separately managing the waste channel generated by the transponder channel allocation according to the mirrored method for a specific use based on the number of channels required according to the transmission characteristics of the data, The present invention relates to a transponder channel allocation method and apparatus in a satellite communication system capable of preventing channel waste of a transponder.

In recent years, with the rapid development of communication technology, satellite communication, which enables subscribers who are located in remote locations to make calls through satellites, is becoming more common, and this is because data is transferred between subscribers of terminal stations by allocating a transponder channel between both terminal stations. It is configured to transmit and receive.

That is, when there is a call request from any terminal station to another arbitrary terminal station, the central station determines whether the terminal station is currently in a state of communication possible based on the status information of the called terminal station. If it is determined that the communication is possible, the available transponder channel is searched for and the transmission and reception channel is allocated to both terminal stations.

Next, the transponder channel allocation method in the central station will be described with reference to FIG.

1 is a diagram illustrating a transponder channel allocation method using a mirrored method, in which (A) shows a general pattern of a transponder channel.

In the figure, reference numeral TDM denotes a TDM channel, and S / A (Slotted Aloha) denotes a slotted Aloha channel. A TDM channel is used to transmit predetermined data transmitted from a central station to each terminal station. When the terminal station transmits predetermined data to the central station, the S / A channel is used, and these two channels are fixedly allocated to the transponder.

In addition, in the transponder, the mirrored method transmits the entire traffic channels into physically divided into upper group channels and lower group channels so that the pilot signals of the intermediate boundary points of the two group channels are mutually symmetrical from each other. And it serves as a receiving channel, and generally set the remaining channel except the channel that is fixedly assigned in the transponder as a traffic channel for data transmission and reception between the terminal stations.

For example, when subscriber 'A' requests channel assignment of the transponder to communicate with subscriber 'A', subscriber 'A' is assigned the first channel of the subgroup channel as a transmission channel as shown in (B). In this case, subscriber 'A' is assigned the last channel of the upper group channel as a transmission channel corresponding to subscriber 'A'.

At this time, the receiving channel used by subscriber A uses the band of the transmission channel used by subscriber A´, and the transmission channel used by subscriber A is used as a receiving channel by subscriber A '. When A 'subscriber requests a voice call, two channels are automatically allocated.

However, in allocating the transponder channel in the mirrored manner, in the case of the TDM channel, three 30 KHz channels are allocated to the upper channel, and in the case of the S / A channel, the 30 KHz channel 2 is assigned to the lower channel corresponding to the TDM channel. The channel is allocated, and in the case of the traffic channel, the upper channel and the lower channel are allocated to correspond to each other centering on the pilot signal for data transmission and reception. The G channel of the lower channel corresponding to the TDM channel of the upper channel is Will not be assigned.

That is, a problem occurs that a channel of a transponder, which is a limited communication resource, is wasted.

Accordingly, the present invention has been made in view of the above circumstances, and by separately managing the channel wasted during the allocation of the transponder channel by the mirror method for a specific use based on the number of channels required according to the data transmission characteristics, An object of the present invention is to realize a method and apparatus for allocating a channel of a transponder in a satellite communication system capable of efficiently utilizing wasted channels.

1 is a diagram illustrating a channel division state of a transponder in a conventional satellite communication system.

Figure 2 is a block diagram showing the configuration of the central station network control unit 10 in the satellite communication system according to the present invention.

3 is a memory map diagram of the traffic channel information storage section 8 in the network control section 10;

4 is a diagram illustrating a channel division state of a conventional transponder and a transponder channel division state according to the present invention.

Fig. 5 is an operation flowchart for explaining the operation of the apparatus in the configuration of Fig. 3;

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

1: processor, 2: SCPC channel unit (SCC),

3: Dual Port RAM (DPRAM), 4: Program Storage,

5: terminal station information storage unit, 6: download channel information storage unit,

7: operation management channel information storage unit, 8: traffic channel information storage unit.

In the satellite communication system according to the first aspect of the present invention for achieving the above object, a transponder channel allocation method uses a satellite to allocate a channel of a transponder to a terminal station in a mirrored manner, thereby establishing a call path between both ends. And a channel usage separation setting step of separating and setting a wasted channel according to a TDM channel and an S / A channel for a specific channel purpose in a satellite communication system for transmitting and receiving data through the assigned channel. An information data storage step of storing channel information according to the channel usage separated in a channel usage separation setting step in a predetermined memory, a traffic channel allocation request determining step of determining whether the received channel allocation request data is a traffic channel allocation request data; If the data received in the traffic channel allocation request determination step is not the traffic channel allocation request data, In the channel region existence determination step of determining whether channel allocation information data exists in the memory for the channel use separated in the setting step, and in the channel region existence determination step, if the channel region is allocated, And a channel assignment step of allocating a channel.

In addition, the transponder channel assignment apparatus in the satellite communication system according to the second aspect of the present invention for achieving the above object, by assigning the channel of the transponder to the terminal station in a mirrored manner by using satellites, In the satellite communication system which forms a communication path and transmits and receives data through this assigned channel, Downloading channel information storing means for storing channel address information of a transponder used when the central station executes downloading to a terminal station. In this case, the operation manager stores the operation management channel information storing means for storing the channel address information of the transponder used for the telephone call for the management of the system, and the information on the channel usage status of the transponder used for transmitting and receiving the traffic data. The traffic channel information storage means and the channel information storage means based on the received channel assignment information. Reads out the information data, including control means for controlling to assign a channel is characterized in that configured.

That is, according to the present invention having the above-described configuration, by separately managing the waste channel generated by the transponder channel assignment according to the mirrored method into a specific region based on the number of channels required according to the transmission characteristics of the data, The channel waste of the transponder, which is a limited communication resource, can be prevented.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the internal configuration of the network control unit 10 of the central station in the satellite communication system according to the present invention.

In the figure, reference numeral 1 denotes a processor that controls the entire system, and in particular, a call processing between terminal stations, and 2 denotes an S / A packet by extracting packet information from a message applied from an SCPC channel unit (not shown). In addition to creating a, it is a service channel controller (SCC) that generates and outputs a message of a time division multiplex (TDM) stream to an SCPC channel unit.

Also, reference numeral 3 denotes a dual port RAM, which is provided for data transmission and reception between the processor 1 and the service channel controller 2.

Reference numeral 4 denotes a program storage unit for storing the operation program of the processor 1, and 5 denotes a terminal station information storage unit for storing state information of each terminal station obtained by the polling operation of the network controller 10. FIG. to be.

In addition, reference numeral 6 is a downloading channel information storage unit that stores the assigned channel address data of the transponder used when downloading from the central station to the terminal station, and 7 indicates that an error occurs in the terminal station or the central station by the system operator. When using the operation management telephone (Order Wire) used to take a predetermined action for reasons such as the operation management channel information storage unit 8, which stores the assigned channel address data of the transponder to be allocated, 8 A traffic channel information storage unit which stores information on an allocated channel usage state of a transponder for data transmission and reception, which is configured in a memory map form according to whether a traffic channel is used or not.

3 shows a memory map diagram of the traffic channel information storage section 8, and shows a memory map diagram of the traffic channel information storage section 8 when one TDM channel and two S / A channels are set. .

The memory map sets the data of the address corresponding to the fixed TDM channel and the S / A channel and the waste channel to "1" in advance, and the data of the address for the channel allocated to the traffic channel. By setting it to 0 ", the channel is limited to be assignable only to the channel allocated to the traffic channel. The address data for the wasted channel is stored in the corresponding channel information storage unit (a download channel information storage unit requiring one channel in the memory map of FIG. 3). Done.

For example, as shown in FIG. 4, when two S / A channels are conventionally required as shown in (X), separate management is performed for each channel allocation purpose in the form of (X,). In the TDM side, the wasted channel G1 is configured to separately set a channel area to allocate one channel to the data download channel D / L.

In addition, when five S / A channels are required as shown in (Y), the channel allocation area is managed separately in the form of (Y,), and five waste channels (G1 to G5) in (Y). ) Is generated, the waste channels G1, G2 and G4, G5 are allocated to the operation management channel (O / W) that requires two channels, and the waste channel G3 requires only one channel. The channel area is separately set to be allocated to the data download channel (D / L).

Next, an embodiment according to the operation of the device having the above-described configuration will be described with reference to FIG.

First, when channel allocation request data is received from the terminal station or the operator terminal (ST1), the processor 1 determines whether the received channel allocation request data is the traffic channel request data (ST2), and the traffic channel allocation request data. In this case, the effective channel available in the traffic channel information storage unit 8 is searched for (ST3).

That is, it is searched whether there is a channel set to “0” in the memory map as shown in FIG. 3. In this case, if it is determined that no valid channel exists in the traffic channel, the processor 1 performs network management not available message. The transfer to the system or the dual port RAM (ST5) (ST5).

On the other hand, if the valid channel search result of the traffic channel information storage unit 8, if there is a valid channel available, it allocates the channel and changes the information data of the channel to "1" in the memory map. (ST8).

Thereafter, the processor 1 determines whether there is a call release request for the allocated channel (ST7), and when the call release request is made, changes the corresponding channel information data of the traffic channel information storage unit 8 to "0". (ST8).

On the other hand, in the step ST2 of determining whether the received channel request data is the traffic channel request data, if the traffic channel request data is not, the predetermined information data, that is, the specific use, is stored in the channel information storage unit storing the requested channel information. It is checked whether channel address data exists in the channel allocation area of the network (ST9).

As a result of checking whether the information data exists in the corresponding channel information storage unit in step ST9, if the predetermined information data does not exist in the corresponding channel information storage unit, the processor 1 allocates the corresponding channel in the traffic channel region. You will repeat the steps.

On the other hand, as a result of checking whether the information data exists in the corresponding channel information storage unit in step ST9, if predetermined information data exists, the processor 1 corresponds to the corresponding address based on the information data stored in the corresponding channel information storage unit. Allocate a channel.

In other words, a channel wasted during system initialization is separately managed and set to a specific channel area based on the number of channels required according to data transmission characteristics such as data download, operation manager's special telephone call, and the like.

Therefore, the transponder, which is a limited communication resource, is usefully managed by separating and managing waste channels generated by the transponder channel allocation according to the mirrored method for specific channel use based on the number of channels required according to the data transmission characteristics. You can use it.

In addition, this invention is not limited to the said Example, It can variously deform and implement within the range which does not deviate from the technical summary of this invention.

As described above, according to the present invention, the wasteful channel generated by the transponder channel allocation according to the mirrored method is separated and managed for a specific use based on the number of channels required according to the data transmission characteristics, thereby limiting communication resources. This can prevent channel waste of the in-transponder.

Claims (6)

In a satellite communication system in which a channel of a transponder is allocated to a terminal station in a mirrored manner by using a satellite, a communication path is formed between both ends, and data is transmitted and received through the assigned channel. Channel usage separation setting step of separating and setting the wasted channel according to the assignment of the TDM channel and S / A channel for a specific channel purpose, An information data storing step of storing channel information according to the channel use separated in the channel use separation setting step in a predetermined memory; A traffic channel allocation request determining step of determining whether the received channel allocation request data is the traffic channel allocation request data; If the data received in the traffic channel allocation request determining step is not traffic channel allocation request data, whether channel allocation information exists to determine whether channel allocation information data exists in the memory for the channel use separated in the channel use separation setting step. Judgment phase, And in the determining whether the channel region exists, when the corresponding channel region is allocated, a channel allocation step of allocating a channel of the corresponding channel region. The method of claim 1, And in the case of determining whether the channel region exists, if the information data of the channel region is not stored, the channel is allocated in the traffic channel region. The method of claim 1, In the channel usage separation setting step, the transponder channel allocation in the satellite communication system is characterized in that the wasteful channel is divided into a download channel for allocating one channel and an operation management telephone call channel for allocating two channels. Way. In a satellite communication system in which a channel of a transponder is allocated to a terminal station in a mirrored manner by using a satellite, a communication path is formed between both ends, and data is transmitted and received through the assigned channel. A downloading channel information storing means for storing channel address information of a transponder used when the central station executes downloading to a terminal station; A means for storing operation management channel information, in which an operation manager stores channel address information of a transponder used in a telephone call for managing a system; Traffic channel information storage means for storing information on channel usage status of a transponder used for transmission and reception of traffic data; And a control means for controlling the channel information storage means to read out the information data and to allocate a channel based on the received channel assignment information. The method of claim 4, wherein And said download channel information storing means and said operation management channel information storing means are configured to separate a channel wasted when allocating a TDM channel and an S / A channel in a transponder. The method of claim 4, wherein The control means assigns a transponder channel in the satellite communication system, characterized in that the traffic channel information storage means allocates a necessary channel when an effective channel does not exist in the download channel information storage means and the operation management channel information storage means. Device.