JP3049736B2 - Time division multi-way multiplex communication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a time division multi-way multiplex communication system.

[Conventional technology]

FIG. 6 shows an example of a network configuration of a communication system based on the time-division multi-way multiplex communication system, which comprises one master station B and one or a plurality of relay stations R or slave stations T. .

Therefore, when a frame (down frame) is transmitted from the master station B to a specific slave station T by designating a station number, the frame is appropriately relayed and reaches the slave station T, and the slave station T permitted to transmit is transmitted. , An upstream signal is transmitted by a burst signal, and the signal is relayed as appropriate to reach the master station B. These operations allow communication between the two stations. Note that the relay station R also has the function of the slave station T, and performs transmission to the relay station R and also transmits signals from the relay station R.

By the way, in this type of time division multi-directional multiplex communication system, it is necessary to arrange the upstream burst signals received by the master station and the relay station in a line on the time axis.
It is necessary to adjust the delay taking into account the delay of the signal (radio wave) due to the distance between the stations.

In this regard, it is conceivable to adjust the delay after constructing the entire network.In this case, however, the delay adjustment must be completed in the upper station of each station. If there is an adjustment station, there is a disadvantage that adjustment of a lower station cannot be performed.

For this reason, in this type of system, the concept of a relay number is introduced, and a fixed delay is determined for each station in accordance with the concept, so that each station can independently adjust the delay. That is, a fixed delay amount is determined between the stations according to the number of stages from the master station regardless of the distance between the stations, and the lower station performs adjustment in its own station based on this. In addition, for the adjustment to the actual distance, a signal is transmitted from the lower station to the upper station, the error is returned from the upper station to the lower station, and the lower station performs delay adjustment so as to cancel the error. Is achieved by

Conventionally, the above-mentioned relay number is manually calculated and manually set for each station.

[Problems to be solved by the invention]

As described above, in the conventional time-division multi-way multiplex communication method, the relay number is manually calculated after grasping the station configuration of the entire network, and the setting is performed for each station. In many cases, it is very troublesome.

Calculation errors and setting errors may occur.

And the like.

The present invention has been proposed in view of the above points, and a purpose thereof is to automatically calculate and set a relay number, thereby reducing the burden on the operator and preventing the occurrence of mistakes. It is to provide a direction multiplex communication system.

[Means for solving the problem]

The present invention achieves the above object by providing one master station and one master station.
One or a plurality of relay stations and slave stations, each slave station having a means for delaying an upstream signal transmitted from the own station by an amount corresponding to the relay number of the own station, and a means for delaying the signal by the means. Means for delay-adjusting the signal according to the distance to the upper station and transmitting the signal as a burst signal to the upper station. Each relay station transmits an upstream signal transmitted from the own station by an amount corresponding to the relay number of the own station. Means for delaying, a signal obtained by multiplexing an upstream signal from a lower station on a signal delayed by the means,
Means for adjusting the delay according to the distance to the upper station and transmitting the burst signal to the upper station as a burst signal, so that the master station and each relay station can control the burst signals received from the lower station so as to be arranged in a line on the time axis. In the division multi-way multiplex communication system, a relay number transmission channel is provided following a frame synchronization pattern in a downstream frame, and an initial value of a relay number is set in a relay number transmission channel of the downstream frame in a master station and a lower station is set. A means for detecting a frame synchronization pattern from a downstream frame received from an upper station to generate a frame synchronization pulse, and a means for transmitting a frame synchronization pulse from the downstream frame with reference to the generated frame synchronization pulse. Means for calculating the relay number of the own station from the separated relay numbers by calculation, and the relay of the own station for obtaining the relay number in the downstream frame. Means for rewriting to a lower-level station and transmitting the lower-level station to each of the slave stations, wherein each slave station detects a frame synchronization pattern from a downstream frame received from the upper-level station to generate a frame synchronization pulse; and Means for calculating the relay number of the own station from the relay number separated from the downstream frame based on

[Action]

In the time division multi-directional multiplex communication system of the present invention, based on the relay number of the relay number transmission channel provided in the downstream frame, the relay station receiving the frame and the slave station calculate their own relay number. Calculated and used to set the fixed delay.

〔Example〕

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

FIG. 1 shows an example of the configuration of a downlink frame 100 employed in the time division multi-directional multiplex communication system of the present invention, which is characterized in that a relay number transmission channel RCH is provided following a frame synchronization pattern F. have. The upstream burst signal 200 is as shown in FIG.

The network configuration of the whole system is as shown in FIG. 6 and is composed of one master station B and one or more relay stations R or slave stations T. The master station B, relay station R and slave station T are respectively It has a circuit configuration as shown in FIG. 3, FIG. 4, and FIG.

That is, as shown in FIG. 3, the master station B adds a relay number transmission channel RCH to a baseband signal including a frame synchronization pattern F and transmission data, and multiplexes a relay number. The signal of the downstream frame 100 generated in step 1 is modulated into a radio frequency signal and the antenna 3
And a modulation / demodulation circuit 2 for demodulating an uplink burst signal 200 of a radio frequency signal received by the antenna 3.

As shown in FIG. 4, the relay station R demodulates the downlink frame 100 of the radio frequency signal received by the antenna 4 into a baseband signal, modulates the uplink signal from the local station into a radio frequency signal, and And a modulation / demodulation circuit 5 for supplying the frame synchronization pattern F
And a relay number calculating circuit 7 for detecting a frame number and detecting a relay number from the demodulated baseband signal based on the frame sync pulse and calculating a relay number of the own station. A multiplexing circuit 8 for multiplexing the demodulated baseband signal with the relay number calculated by the relay number calculating circuit 7; and a modulation of the signal of the downstream frame 100 generated by the multiplexing circuit 8 into a radio frequency signal to form an antenna 1
A modulation / demodulation circuit 9 for supplying an uplink burst signal 200 of the radio frequency signal received by the antenna 10 while supplying the signal to the
A fixed delay circuit 11 for providing a fixed delay according to the relay number calculated by the relay number calculation circuit 7 to the upstream signal from the own station; an upstream signal delayed by the fixed delay circuit 11 and demodulation by the modulation / demodulation circuit 9 A delay adjustment circuit that multiplexes the uplink signal from the lower station and gives a delay corresponding to the distance to the upper station to provide the uplink signal to the modulation / demodulation circuit 5.
12 and has.

As shown in FIG. 5, the slave station T demodulates the downlink frame 100 of the radio frequency signal received by the antenna 13 into a baseband signal, modulates the uplink signal from the local station into a radio frequency signal, and , A frame synchronization circuit 15 that detects a frame synchronization pattern F from the demodulated baseband signal and generates a frame synchronization pulse, and relays the demodulated baseband signal based on the frame synchronization pulse. A relay number calculating circuit 16 for separating the numbers and calculating the relay number of the own station, and a fixed delay for giving a fixed delay according to the relay number calculated by the relay number calculating circuit 16 to the uplink signal from the own station It has a circuit 17 and a delay adjustment circuit 18 that gives a delay according to the distance to the upper station from the upstream signal delayed by the fixed delay circuit 17 and provides the upstream signal to the modulation / demodulation circuit 14.

 Hereinafter, the operation of the above embodiment will be described.

The master station B adds a relay number transmission channel RCH to the baseband signal by the multiplexing circuit 1, sets a relay number “0” therein, modulates the signal into a radio frequency signal by the modulation / demodulation circuit 2, The downstream frame 100 is transmitted to the station R or the slave station T.

In the relay station R or the slave station T that has received the downstream frame 100 from the master station B, the modems 5 and 14 demodulate the base frame signal, and then the frame synchronization circuits 6 and 15 detect the frame synchronization pattern F and perform frame synchronization. A pulse is generated, and based on the timing, the relay number calculation circuits 7 and 16 separate the relay number transmission channel RCH to obtain the relay number “0”,
For example, a value “1” obtained by adding “1” is set as the relay number of the own station. In the case of the relay station R, the modulation and demodulation circuit 9 sets “1” after adding “1” as the relay number of the relay number transmission channel RCH of the downlink frame 100 transmitted to the lower station by the multiplexing circuit 8. And transmits to the lower station via the antenna 10.

Similarly, the lower station also sets a value obtained by adding "1" to the relay number of the received downstream frame 100 as the relay number of the own station. In the case of the relay station R, the relay number of the downstream frame 100 to be transmitted to the lower station is set. Set to the value after adding “1”.

Through these processes, a relay number corresponding to the number of stages from the master station B is set for each station.

Then, in the relay station R and the slave station T, a fixed delay corresponding to the relay number calculated by the relay number calculation circuits 7 and 16 is given to the uplink signal from the own station by the fixed delay circuits 11 and 17, and further, Delay adjustment circuit 12, 1
8, the upstream signal (in the case of the relay station R, the delay adjustment circuit 12
In the above, an uplink signal multiplexed with an uplink signal from the own station and an uplink signal received from a lower station is an uplink signal. ), And transmits the same as an uplink burst signal 200 to the upper station via the modulation / demodulation circuits 5, 14 and the antennas 4, 13.

As a result, the upstream burst signals 200 received by the master station B and the relay station R are controlled so as to be arranged in a line on the time axis.

In the above description, the master station B is set to “0” as the relay number.
And "1" is added for each stage. However, the present invention is not limited to this, and corresponds to the number of stages from the master station B and has a one-to-one correspondence with the fixed delay amount. Any numerical value can be used.

〔The invention's effect〕

As described above, in the time division multi-directional multiplex communication system of the present invention, each station automatically calculates and sets the relay number based on the relay number of the relay number transmission channel provided in the downlink frame. Therefore, the burden on the operator can be reduced.

There is no artificial calculation / design error of the relay number.

And so on.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a downlink frame in the time division multi-directional multiplex communication system of the present invention, FIG. 2 is a configuration diagram of an uplink burst signal, FIG. 3 is a configuration diagram of a master station, and FIG. FIG. 5 is a block diagram of a slave station, and FIG. 6 is a block diagram of a network. In the figure, 100: Down frame F: Frame synchronization pattern RCH: Relay number transmission channel 200: Up burst signal B: Master station 1: Multiplex circuit 2: Modulation / demodulation circuit 3: Antenna R: Relay Station 4 Antenna 5 Modulation / demodulation circuit 6 Frame synchronization circuit 7 Relay number calculation circuit 8 Multiplex circuit 9 Modulation / demodulation circuit 10 Antenna 11 Fixed delay circuit 12 Delay adjustment circuit T … Slave station 13… Antenna 14… Modulation / demodulation circuit 15… Frame synchronization circuit 16… Relay number calculation circuit 17… Fixed delay circuit 18… Delay adjustment circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 12/40-12/48

Claims (2)

(57) [Claims] 1. An apparatus comprising one master station, one or more relay stations, and slave stations, wherein each slave station transmits an uplink signal transmitted from its own station in an amount corresponding to its own relay number. Means for delaying, and means for delay-adjusting the signal delayed by the means according to the distance to the upper station and transmitting the burst signal to the upper station as a burst signal. Means for delaying the signal by an amount corresponding to the relay number of the own station, and a signal obtained by multiplexing the signal delayed by the means with the upstream signal from the lower station, delay-adjusting according to the distance to the upper station, and forming a higher-order signal as a burst signal. Means for transmitting to a station, the master station and each relay station control the burst signals received from the lower station so that they are arranged in a line on the time axis. A relay number transmission channel is provided following the relay station, and the master station is provided with means for setting an initial value of the relay number in the relay number transmission channel of the downlink frame and transmitting the initial value to the lower station. Means for detecting a frame synchronization pattern from a downstream frame received from the station to generate a frame synchronization pulse, and calculating a relay number of the own station from a relay number separated from the downstream frame with reference to the generated frame synchronization pulse. And a means for rewriting the relay number in the downlink frame to the determined relay number of the own station and transmitting the relay number to the lower station. Each slave station detects a frame synchronization pattern from the downlink frame received from the upper station. Means for generating a frame synchronization pulse, and Division multidirectional multiplex communication system when, characterized in that it comprises a means for obtaining by calculating the following numbers. 2. The master station sets a relay number transmission channel of a downstream frame to a relay number "0" and sends it out. The relay station and the slave station add their received relay number plus "1" to their own relays. 2. The time-division multi-way multiplex communication system according to claim 1, wherein the relay station has a configuration in which the relay station sets the relay number after adding "1" to the relay number transmission channel of the downlink frame and transmits the downstream frame.