JPS62139494A - Network control system - Google Patents

Abstract

PURPOSE:To deliver a network control information for time division multiple access satellite communication by dividing the network control information to be delivered from a reference station to a general station into common information in each station group and information to individual stations and transmitting these information to respective station. CONSTITUTION:Burst time plan information is divided and reconstituted to information 26 common to respective local groups consisting of stations (a), (b), (l) e.g., information 27 common to all stations and specific information 28a-28l to individual stations by control circuit 24 for the sort/reconstitution of information common to respective groups and stored in memories 25a-25l. A transmission network control information forming circuit 29 accesses the memories 25a-25l to extract respective information, respective destination information are added to these information and the added information is written in a transmission network control information memory 30. The burst time plan information 34 formed to all the stations is read out in a reference burst forming circuit 36 and delivered to respective general stations on the basis of multiple address communication.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a network control method for a time division multiple access satellite communication system, and particularly to a network control method for distributing network control information such as a burst time plan.

[Conventional technology]

Conventionally, in time division multiple access satellite communication systems, the reference station sends network control information to multiple general stations that make up the network, and controls the functions of the general stations to be configured as one node of the network. In this case, the network control information created for each general station is transmitted via the network control information channel included in the reference burst.
Each control frame having a cycle that is an integral multiple of the time-division frame is sequentially delivered to each general station at independently assigned timings. In other words, the transmission capacity of the network control information channel of one reference burst cannot be made large enough in consideration of frame efficiency, etc.
Network control information such as a burst time plan required by one general station cannot be delivered in one transfer, but is delivered in time division over multiple control frames.

Normally, the control frame period is set to the maximum number of stations included in the network. Therefore, for example, the number of stations included in one network is N, and the capacity of the network control information channel provided in the reference burst is C,1.
The capacity of network control information such as the commonly required burst time plan is M1, and the period of the time-sharing frame is t.
In this case, the time T required to deliver network control information to all stations can be shown below.

T=-XNt Figures 2(,) and 2(b) are functional block diagrams of the reference station and general station showing the conventional network control method, and especially the burst time, which is the most important and main part of the network control information. This is a control method regarding plan information. 1 is burst time plan master data, 2 is master data memory for burst time plan generation,
3 is a memo for general stations 9-1 is a memory, 5a-5n
61 to 6n are the address counters for the a station to the address counters for the n station, the a-station burst time plan information to the n-station burst time plan information output from the memory 4n for the a station, 7 is a selector that outputs the selector output signal 8; 9 is a reference burst generation circuit that generates a reference burst for each time-division frame; 10 is the number of general stations included in the network (for example, n stages); An n-stage control frame counter receives a time-division frame timing pulse 11 at a terminal 10m, outputs a count value signal 12 from an output terminal 10b, and outputs a count-up signal 13 from an output terminal IQc, and 14 is network control information. Delivery timing information, 1
5 is a timing signal of a time division frame established using the received reference burst as a time reference; 16 is a control frame timing detection signal; 17 is an n-stage control frame counter that outputs a count value signal 18; and 19 is the network control information. A comparator which compares the delivery timing information 14 and this count value signal 18 and outputs a coincidence signal 2G when they match, 21 is burst time plan information, 22 is an address color/receiver, and 23 is a burst time plan memory.

Next, the operation of the network control method with the above configuration will be explained. First, in the reference station, when a new burst time plan generation request is issued to the network, burst time plan master data 1 is written into the burst time plan generation master data memory 2. When this burst time plan master data 1 is written, the burst time plan generation circuit 3 reads out the burst time plan master data 1 from this master data memory 2 at an appropriate timing and generates a burst for each general station. A time plan is generated. This burst time plan has a word length equal to the capacity of the network control information channel included in the reference burst, and is stored in burst time plan memories 4a to 4n that are provided independently for each general station. Ru. Then, when the burst time plan for the entire crotch is generated, the control frame counter 10 inputs its input terminal 10.
It counts the timing pulses 11 input to the terminal a, and outputs the count value signal 12 to the selector 7 from the output terminal 10b. Therefore, the selector 7 inputs the count value signal 1
2, each connected in a predetermined order based on
The crotch direction is selected by the output of the burst time plan memories 4a to 4n, and the selector output signal 8 is output to the reference burst generation circuit 9. And control frame counter 1
Timing pulse 11 where 0 is a time division frame. When all control frames are counted, a count up signal 13 is output from the output terminal 10c and reset to the initial value. Therefore, address counters 5a to 5n are counted up by inputting this count up signal 13,
Next, the control frame is supplied with transmission subekihast time plan information 6 to 6n to the selector 5. In this way, the reference station sequentially delivers burst time plan information for each station. Next, in the general station, the control frame counter 17 is reset to the initial value by the control frame timing detection signal 16, and then counts frames using the timing signal 15 of the received time-division frame as a clock, and the count value signal 18 is sent to the comparator. Output to 19. Therefore, the comparator 19 compares the count value signal 1B with the net 1 NO control information delivery timing information 14 assigned to the own station in advance, and outputs the coincidence signal 20 at the frame 2 timing when a coincidence is found. do. Therefore, the burst time plan memory 23 writes the burst time plan information 21 delivered by the network control information channel included in the received reference burst at the timing when the coincidence signal 20 is output. In response to the input of this coincidence signal 20, the address color/receiver 22 sequentially updates its addresses, and stores the burst time plan memory 23 in the burst time plan memory 23 each time a burst time plan is delivered to the local station. .

[Problem that the invention seeks to solve]

In the conventional network control method described above, when performing network control for all stations, such as changing the network burst time plan, time T is required to deliver the network control information, as given by the equation above. However, in a time division multiple access satellite communication system where a large number of general stations are included in the network and the capacity of the network control information channel included in the reference burst is reduced in order to increase frame efficiency, the above-mentioned required time T becomes significantly large. Furthermore, in time-division multiple access satellite communication systems, the objective of effective use of lines through timely burst time planning and simultaneous switching based on users' line usage requests, which is expected to be the most important feature, cannot be achieved. Furthermore, in the case of a mesh type network in a normal satellite system, although the burst time plan for each station contains a considerable amount of information common to each station, such as position information of received bursts and burst length information of received bursts, , the method of sequentially delivering network control information such as the above-mentioned burst time plan required for each interval does not utilize the broadcast communication characteristic of satellite communication at all, and instead uses the network control information channel, which is a shared line. There were problems such as a significant decrease in the utilization efficiency of the system.

[Means for solving problems]

In the network control method according to the present invention, the reference station separates and reconfigures the network control information to be delivered to general stations into information common to each station group and information unique to each individual station, and adds a station group destination or a station destination. When receiving network control information that has a local address assigned in advance to the local station or a local group destination, the information directed to the local station This information is written to the network control information memory of the own station and used for network control.

[Effect]

This invention adds destination information to the network control information to be distributed, enables information to be distributed regardless of the control frame cycle, extracts information common to multiple general stations, utilizes the broadcasting nature of satellite communication, and transmits the information all at once. By delivering network control information such as burst time plans in an extremely short time, it is possible to fulfill a user's line usage request in the shortest possible time.

〔Example〕

FIG. 1(&) and FIG. 1(b) are functional block diagrams of a reference station and a general station showing an embodiment of the network control method according to the present invention. An example of a control method regarding certain burst time plan information is shown. In the same figure, 24 is a group common information classification and reconfiguration control circuit, 25a, 25b -
25t is the asbst station common information 26. All stations common information 27. 29 is a transmission network control information generation circuit, and 30 is an asbat station group destination 31. which includes a*b++ and station common information. All-station destination 32 including all-station common information and a-station destination 33 including 8-station specific information
a.

For all stations with general station specific information 33 such as 6 station destination 33b containing 6 station specific information and 0 station destination 33e including c station specific information, transmission network control information in which burst time plan information 34 is written. 35 is a time division frame timing signal; 36 is a reference burst generation circuit; 37 is a network control information extraction circuit; 38 is a received data sequence of the network control information channel included in the received reference burst; 39 is a destination register; 4G
41 is a comparator that compares this own group destination 40 with the destination information of the received network control information and outputs a control activation signal 42 when they match. A comparator that compares the destination 44 with the destination information of the received network control information and outputs a control stop signal 45 when they match, 46 is the own station destination, and 47 is the own station destination 46 and the destination of the received network control information. 49 is an address control circuit that outputs a write address signal 50, 51 is a symbol clock, 52 is a serial/parallel conversion circuit, and 53 is a network control information memory. It is.

Next, the operation of the network control method with the above configuration will be explained. First, in the reference station, when a new burst time plan generation request is issued to the network, burst time plan master data 1 is written into the burst time plan generation master data memory 2. When this burst time plan master data 1 is written, the burst time plan generation circuit 3 reads out the burst time plan master data 1 from this master data memory 2 at an appropriate timing and generates a burst for each general station. A time plan is generated. This burst time plan has a word length equal to the capacity of the network control information channel included in the reference burst, and is stored in burst time plan memories 4a to 4L provided independently for each general station. Ru. Then, the burst time plan information stored in the intra-office burst time plan memory 4t from the a-office burst time plan memory 4 @- provided for each general station is transferred to, for example, the aebe
Common information for L station group 26. Information 27 common to all stations and each station, station a, station b.

After being separately reconstructed into station-specific information 28a to 28t, the information is stored in separate burst time plan memos 1J25a to 25t provided for each section. Then, the transmission network control information generation circuit 29 accesses the classified burst time plan memories 25a to 251, extracts common information, and extracts common information such as &@ba.
t station group destination 31. A destination 32 that indicates all stations and information specific to each film agent, for example, 3 station destinations 33a and b station destination 33b.
, by adding a unique destination 33 such as station destination 33c,
Write to the transmission network control information memory 30. All stations created in this way are based on the burst time plan (if
The information 34 is read out to the reference burst generation circuit 36 in the address order of the transmission network control information memo IJ 30 in synchronization with the hourly divided frame timing signal 35, and is broadcast via the network control information channel provided in the reference burst. and delivered to each membrane agent. Next, in the membrane agent, the network control information extraction circuit 37 extracts the received data series 3B of the network control information channel included in the received reference burst, and outputs it to the destination register 39 and the serial/parallel conversion circuit 52. do. The symbol clock 51 is supplied to the destination register 39 and the serial/parallel conversion circuit 52, and the received data series 3B is taken in. Destination information is assigned to the beginning of this received data series 38. Therefore, the comparator 41 uses this destination information and the own group destination 40 given to the own station in advance.
Compare with 1. , when this own group destination matches the destination information of the received network control information, a control activation signal 42 is sent.
is output to the address control circuit 49. Therefore, this address control circuit 49 outputs the write address signal 50 to the network control information memory 53, so that the received data following this destination information is sent to the network control information memory 53.
is written in the predetermined own group network control information area. Similarly, the comparator 47 uses the destination information and the local destination 46 given to the local station in advance.
When the local station destination matches the local station destination 46 predetermined in the received network control information, the control activation signal 48 is sent to the address control circuit 4.
Output to 9. Therefore, the address control circuit 49 outputs the write address signal 50 to the network control information memory 53, so that the received data following this destination information is stored in the network control information memory 53 in a predetermined network control information area for the own station. written.

Then, the comparator 43 selects destinations 4 other than the own group destination and the own station destination.
4 is detected, the control stop signal 45 is output to the address control circuit 49, so the above-described write operation is continued until the control stop signal 45 is input.

〔Effect of the invention〕

As explained in detail above, according to the network control method according to the present invention, the delivery of network control information such as a burst time plan can be significantly shortened regardless of the number of general stations included in the network, and time division multiplexing In a connected satellite communication system, the most anticipated feature is a timely burst time plan based on users' requests for line use, which enables effective use of lines through simultaneous switching.

[Brief explanation of drawings]

FIG. 1(-) and FIG. 1(b) are functional block diagrams of a reference station and a general station showing an embodiment of the network control method according to the present invention, and FIG. 2(-) and FIG. 2(b) are FIG. 2 is a functional block diagram of a reference station and a general station showing a conventional network control method. 1., Burst time graph/master data, 2.
... Master data memory for burst time plan generation, 3. Fist - Towards the crotch is the generation circuit for the burst time plan, 4a to 4n... - Toward the crotch is the memory for a station for the burst time plan ~ Memory in the n station, 24...
・Group common information classification and reconfiguration control circuit, 25a to 25z...
... Separate burst time plan memory, 29 ... Transmission network control information generation circuit, 3o ... Transmission network control information memory, 3311 ... - Crotch specific information, 34 ... Burst time for all stations Plan information L
35...Fist time division frame timing signal, 36...
Meeting/reference burst generation circuit.

Claims (1)

[Claims] In a time-division multiple access satellite communication system in which a reference station controls the network configuration functions of multiple general stations by means of network control information delivered via a network control information channel included in a reference burst, the reference station is distributed to each general station. A means for hierarchically reconfiguring the network control information to be transmitted based on the broadcast communication characteristics of satellite communications, and a means for adding station group destinations to information common to multiple general stations among this reconfigured information. , a means for transmitting information specific to each general station without being limited to control frames by adding a station destination, and the general station has means for decoding the station group destination or station destination, and a means for decoding the station group destination or the station destination, 1. A network control system comprising means for writing network control information delivered to a station or a group to which the local station belongs into a network control information memory of the local station.