JPH0444434A - Time division multi-direction multiplex communication system - Google Patents

Abstract

PURPOSE:To relieve the load of the operator and to eliminate the calculation and setting mistake of a relay number by the operator by allowing each station to calculate and set the relay number automatically based on the relay number in a relay number transmission channel provided to an outgoing frame. CONSTITUTION:A multiplexer circuit 1 of a master station B adds a relay number transmission channel RCH to a base band signal, sets a relay number '0' thereto, and sends an outgoing frame 100 to a subordinate relay station R or a slave station T from an antenna 3. A relay number arithmetic circuit 7 of the subordinate relay station R or the slave station T receiving the outgoing frame 100 from the master station B demultiplexes the relay number transmission channel RCH to acquire the relay number '0' and sets a value '1' being the addition of,e.g., '1' to the relay number '0' as a relay number of its own station. A relay number in response to the stage number from the master station B is set to each station through the processing. Then a fixed delay circuit 11 in the subordinate relay station R or the slave station T gives a fixed delay in response to the relay number acquired through the calculation of the relay number arithmetic circuit 7 to an incoming signal from its own station.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time division multidirectional multiplex communication system.

[Conventional technology]

FIG. 6 shows an example of a network configuration of a communication system based on the time division multidirectional multiplex communication system, and is composed of one master station B and one or more relay stations R or slave stations T. .

Therefore, when a frame (downlink frame) is transmitted from a master station B to a specific slave station T by specifying a station number, it is relayed appropriately and reaches the slave station T. An uplink signal is transmitted as a burst signal from the base station B, is relayed as appropriate, and reaches the master station B, and communication is performed between the two stations through these operations. Note that the relay station R also functions as a slave station T, and transmits data to the relay station R as well.
Relay station R also transmits signals.

By the way, in this type of time-division multidirectional multiplex communication system, it is necessary to arrange the uplink 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 by taking into account the delay of the signal (wave).

In this regard, it is conceivable to perform delay adjustment after constructing the entire network, but in that case, delay adjustment must be completed at the upper station of each station, and if there is a station under construction, etc. If there is a coordinating station, there is an inconvenience that it is not possible to coordinate lower-level stations.

For this reason, this type of system introduces the concept of a relay number, and sets a fixed delay for each station accordingly, so that each station can independently adjust the delay. That is, a fixed amount of delay is determined between each station according to the number of stages from the master station, regardless of the distance between the stations, and lower stations make adjustments at their own stations based on this. To adjust the actual distance, the lower station sends a signal to the higher station, the higher station sends the error back to the lower station, and the lower station adjusts the delay to cancel out the error. This is achieved by

Conventionally, the relay number described above was calculated manually and manually set for each station.

[Problem to be solved by the invention]

As mentioned above, in the conventional time division multidirectional multiplex communication system, the relay number was calculated manually after understanding the station configuration of the entire network, and the relay number was set for each station, so the number of stations was 0. If there are many, it is very time consuming.

■Calculation errors and setting errors may occur.

There were drawbacks such as.

The present invention has been proposed in view of the above points, and its purpose is to automatically calculate and set relay numbers, thereby reducing the burden on operators and preventing mistakes. The object of the present invention is to provide a direction multiplex communication system.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a relay number transmission channel in a downstream frame, and the relay station and slave station receiving the frame calculate and obtain their own relay number.

[Effect]

In the time division multiplex communication system of the present invention, the relay station and slave station that have received the frame calculate their own relay number based on the relay number of the relay number transmission channel provided in the downlink frame. and used to set the fixed delay.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

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

The network structure of the entire system is as shown in Fig. 6, and consists of one master station B and one or more relay stations R or slave stations T, with the master station B, relay station R1, and slave station T each having a It has a circuit configuration as shown in FIGS. 3, 4, and 5.

That is, as shown in FIG. 3, the master station B has a multiplex circuit 1 that adds a relay number transmission channel RC°H to a baseband signal containing a frame synchronization pattern F and transmission data, and multiplexes the relay number. , a modulation/demodulation circuit 2 that modulates the signal of the downlink frame 100 generated by the multiplexing circuit 1 into a radio frequency signal and supplies it to the antenna 3, and demodulates the upper reversal signal 200 of the radio frequency signal received by the antenna 3. are doing.

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 its own station into a radio frequency signal, and sends it to the antenna 4. The modulation/demodulation circuit 5 supplies the frame synchronization pattern F from the demodulated baseband signal to the frame synchronization pattern F.
a frame synchronization circuit 6 that detects the frame synchronization pulse and generates a frame synchronization pulse, and a relay number calculation circuit 7 that separates the relay number from the demodulated baseband signal based on the frame synchronization pulse and calculates the relay number of its own station. , a multiplexing circuit 8 that multiplexes the relay number calculated by the relay number calculation circuit 7 onto the demodulated baseband signal, and a multiplexing circuit 8 that modulates the signal of the downlink frame 100 generated by the multiplexing circuit 8 into a radio frequency signal and sends it to the antenna 10. A modulation/demodulation circuit 9 that supplies the upper reverberation signal 200 of the radio frequency signal received by the antenna 10, and a relay number calculation circuit W for the upstream signal from the local station.
A fixed delay circuit 11 provides a fixed delay according to the relay number calculated by I7, and multiplexes the upstream signal delayed by the fixed delay circuit 11 and the upstream signal from the lower station demodulated by the modulation/demodulation circuit 9. , and a delay adjustment circuit 12 that provides an upstream signal to the modulation/demodulation circuit 5 by applying a delay to the signal according to the distance from the upper station.

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, and also modulates the uplink signal from its own station to the radio frequency signal and sends it to the antenna. Modulation/demodulation circuit 14 that supplies to 13
, a frame synchronization circuit 15 that detects a frame synchronization pattern F from the demodulated baseband signal and generates a frame synchronization pulse; and a frame synchronization circuit 15 that separates a relay number from the demodulated baseband signal based on the frame synchronization pulse, A relay number calculation circuit 16 that calculates the relay number of a station, and a fixed delay circuit 1 that provides a fixed delay corresponding to the relay number calculated by the relay number calculation circuit 16 to an uplink signal from the local station.
7 and the modulation/demodulation circuit 14 by giving a delay corresponding to the distance from the upper station to the upstream signal delayed by the fixed delay circuit 17.
The delay adjustment circuit 18 provides an upstream signal to the output signal.

The operation of the above embodiment will be explained below.

The master station B adds a relay number transmission channel RCH to the baseband signal using a multiplex circuit 1, and adds a relay number transmission channel RCH to the baseband signal, for example, by adding a relay number transmission channel RCH to the baseband signal.
0'' is set, the modulation/demodulation circuit 2 modulates it into a radio frequency signal, and the downlink frame 100 is transmitted from the antenna 3 to the lower relay station R or slave station T.

At the relay station R or slave station T, which has received the downlink frame 100 from the master station B, the modulation/demodulation circuits 5 and 14 demodulate it into a baseband signal, and then the frame synchronization circuit 6.15 detects the frame synchronization pattern F and performs frame synchronization. Generates a pulse and based on its timing relay number calculation circuit 7.16
The relay number transmission channel RCH is divided to obtain the relay number "0", and the value obtained by adding, for example, "1" to it, .degree.1.degree., is set as the relay number of the own station. In the case of relay station R, the relay number of the lower reframe 100 transmitted to the lower station by the multiplex circuit 8 is set to "1" after adding "l" as the relay number of the transmission channel RCH, and the modulation/demodulation circuit 9 and antenna 1o to lower-level stations.

Similarly, the lower station also sets the value obtained by adding "1" to the relay number of the received downlink frame 100 as its own relay number,
In the case of relay station R, the downlink frame 100 is sent to the lower station.
Set the relay number 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 to each station.

Then, in the relay station R and slave station T, a fixed delay corresponding to the relay number calculated by the relay number calculation circuit 7.16 is applied to the uplink signal from the local station by the demarcation delay circuit 11.17, and further, The delay adjustment circuit 12.18 adjusts the delay amount according to the distance from the upper station to the uplink signal (in the case of relay station R, the delay adjustment circuit 12 combines the uplink signal from the own station and the uplink signal received from the lower station). ), which is multiplexed and becomes the upstream signal.
The signal is sent to the upper station as an upper reverb signal 200 via the upper reverb signal 200.

As a result, the uplink burst signals 200 received by the master station B and the relay station R are side gated so that they line up in a line on the time axis.

In addition, in the above explanation, the master station B is referred to as “0°” as the relay number.
Although "l" is added for each stage, the present invention is not limited to this, but corresponds to the number of stages from master station B, and corresponds to the fixed delay amount in a one-to-l ratio. You can use any numerical value you have.

〔Effect of the invention〕

As explained above, in the time division multiplex communication system of the present invention, a relay number is automatically calculated and set at each station based on the relay number of the relay number transmission channel provided in the downlink frame. ■The burden on the operator can be reduced.

■No artificial calculation or setting errors in relay numbers.

There are other effects.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a downlink frame in the time division multiplex communication system of the present invention, Figure 2 is a configuration diagram of an uplink burst signal, Figure 3 is a configuration diagram of a master station, and Figure 4 is a configuration diagram of a relay station. Figure 5 is a block diagram of the slave station, and Figure 6 is a block diagram of the network. In the figure, 100... Downlink frame F... Frame synchronization pattern RC
H...Relay number transmission channel 200...
・Uplink burst signal B・・・・・・・・・Master station L・・・・・・・・・Multiple 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...Multiple 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

Claims (3)

[Claims] (1) A time division multidirectional multiplex communication system characterized in that a relay number transmission channel is provided in a downstream frame, and the relay station and slave station that receive the frame calculate and obtain their own relay numbers. (2) The master station sets the relay number "0" to the relay number transmission channel of the downlink frame and sends it out, and the relay station and slave station add "1" to the received relay number and use it as their own relay number. 2. The time division multidirectional multiplex communication system according to claim 1, wherein the relay station sets the relay number after adding "1" to the relay number transmission channel of the downlink frame and transmits it. (3) Relay stations and slave stations each have a frame synchronization circuit that detects a frame synchronization pattern from a downstream frame and generates a frame synchronization pulse, and a frame synchronization circuit that separates the relay number from the downstream frame based on the frame synchronization pulse, and 3. The time division multidirectional multiplex communication system according to claim 1, further comprising a relay number calculation circuit for calculating a number.