CN85106879B

CN85106879B - Channel monitoring circuitry of a relay station in radio digital transmission line

Info

Publication number: CN85106879B
Application number: CN85106879A
Authority: CN
Inventors: 中岛正博; 桥本博己
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 1985-09-12
Filing date: 1985-09-12
Publication date: 1988-04-06
Also published as: CN85106879A

Abstract

The present invention relates to a channel monitoring circuit used in a radio digital transmission system containing at least one relay station. The channel monitoring circuit not only comprises a failure detecting circuit for conventional interconnection leading wires by a parity check method, but also comprises a control bit inserting circuit for inserting one parity control bit into received signals, a control bit picking circuit for picking the control bit from the received signals, an output signal for logically operating the conventional failure detecting circuit, an output signal of the control bit picking circuit, an output signal of a logic responding circuit and a second failure detecting circuit for detecting failure on a transmission line between the relay station and a direct prior station.

Description

The channel monitoring circuitry that the relay station of radio digital transmission line uses

〈 ﹠﹠〉channel quality monitoring in the system uses parity check method widely.As everyone knows, in this technical field, according to this parity check method, the digital signal of being made up of the pulse train that comprises the mark-and-space that is transmitted is divided into many data segments with suitable number of time slot at the transmitting terminal station.Mark spacing to each data segment is counted, and the result of its counting is inserted into respectively in the predetermined time slot of data segment separately as parity data.In receiving end station, in order to calculate parity, the number of mark in the data segment that receives or spacing is counted, and extracted parity data in this data segment.Then, the odd and even data of calculating and the parity data of extraction are given comparison, in order to confirm in this data segment, whether to exist error code.Each data segment all gives verification with above-described same way as.Be used in and insert parity data in the dispatching station in the data of transmission, method at receiving station's its parity data of verification detects error code then, though can detect the fault on the transmission line between dispatching station and the receiving station, but, just can't determine the location of fault on this transmission line when under the occasion of inserting between dispatching station and the receiving station more than a relay station.

Therefore, an object of the present invention is to provide a kind of novelty, can not only be between dispatching station and receiving station, and the channel monitoring circuitry of monitor channel quality between any two stations in the relay station that can in the wireless digital transmission system, be comprised.

According to the present invention, a kind of channel monitoring circuitry that is installed in the relay station of wireless digital transmission system that is provided comprises:

Digital input signals of sending here with the receiving system of relay station is as the input of feed, one is connected on this input, for the counter that contained mark number in the data segment of the number of time slot that has a predetermined input signal at one is counted, one is connected this input, for the check digit of extracting parity check bit from input signal is extracted circuit, with a comparator that is used for the output signal of comparison counter output signal and check digit extraction circuit, output signal in response to this comparator, first failure detector circuit that is used for detection failure on the transmission line between dispatching station and the relay station, an output that is used for comparator is inserted into that the control bit as the odd even control bit inserts circuit among the input signal, one is connected to control bit and inserts on the circuit, be used to send the input signal that the inserted parity check bit output to the dispensing device of this relay station, a control bit extraction circuit that is used for extracting control bit from input signal, one is extracted the output signal of the output signal of circuit and comparator as feed with control bit, so that handle these output signals logically, produce representative one 〈 ﹠﹠ is arranged line 201 receives by receiver 202, the output signal of receiver 202 is fed on the demodulator 203, therefore, intermediate-freuqncy signal is demodulated into the input 1-1 that is added to channel monitoring circuitry 100,1-2 ... the N line data signal of 1-N.In the timing generator in receiving system 200, extract a reference signal in the synchronizing signal from be included in demodulated signal, so that following timing signal S102 that will introduce and S106 data input 1-1 are provided for channel monitoring circuitry 100 ... 1-N is connected on each input of a mark counter 3.And data input pin 1-1 is also connected to check digit and extracts on the input of circuit 4, control bit extraction circuit 7 and control bit insertion circuit 10.The output that mark counter 3 and check digit are extracted circuit 4 is connected respectively on two inputs of a comparator 5, and the output of comparator 5 is connected to the input that a failure detector circuit 6, logical circuit 8 and control bit insert circuit 10.The output of logical circuit 8 is connected to the input of another failure detector circuit 9, and failure detector circuit 6 and 9 output are connected to the input of a warning and display circuit 11.The output that control bit inserts circuit 10 is connected to N output 2-1,2-2 ... on the output 2-1 among the 2-N.Remaining output 2-2 ... 2-N is connected respectively to input 1-2 ... on the 1-N.

Output 2-1,2-N is connected on the input of modulator 301 of dispensing device 300, modulator 301 is modulated to the capable input signal of N on the intermediate-freuqncy signal, this intermediate-freuqncy signal is given a transmitter 302, and this transmitter sends to next relay station by antenna 303 with a wireless digital signal.

The timing signal S102 that timing generator 204 produces delivers to check digit and extracts circuit 4, and timing signal S106 then is added to control 〈 ﹠﹠ 〉

Fig. 2 A and Fig. 2 B represent from the timing relationship of the parity check bit of input data signal extraction.Fig. 2 A represents to be fed to a string data sequence of relay station, and wherein A represents a data verification scope, i.e. * one section of wherein including the time slot that pre-determines number described above.Time slot B is used at parity check bit of transmitting terminal station insertion in advance, and by design, making in advance, time slot B is included among the signal S100-1 of input 1-1.Based on the reference signal of an extraction, timing signal generator circuit 204 is given check digit and is extracted 4 one representatives of circuit corresponding to time slot B signal S102(Fig. 2 B regularly) check digit extracts circuit 4 extracts time slot B according to timing signal S102 content.The content that is extracted is exported as a parity signal S103.

Comparator 5 compares two input signal S101 and S103, exports a comparator output signal S104.

When not having error code to take place among each data segment A between this relay station and the transmitting terminal station, the output signal S104 of comparator becomes one and meets signal, otherwise when the data segment between this relay station and the transmitting terminal station produced error code, the output signal S104 of comparator became a non-signal that meets.This comparator output signal S104 is sent to failure detector circuit 6 and logical circuit 8.According to this comparator output signal S104, error-detector circuit 6 produces a failure alarm signal S105.More particularly, utilize this failure alarm signal S105, detected a fault between transmitting terminal station and relay station.Failure alarm signal S105 is sent to and reports to the police and display unit 11.Above system is the method that is included in the detection failure of the routine between transmitting terminal station and relay station in the transmission system that utilizes known parity technique.

Time slot C as shown in Fig. 2 A inserts a purpose that is reported in dispatching station and directly has the information signal of error code between the next stop in order to reach.By design, make this time slot be included in data-signal S100-1.In other words, the comparator output signal S104 that directly sets out in advance to make arrangements is included among this time slot C.Control bit extracts circuit 7 according to the timing signal S102 〈 ﹠﹠ that is produced by timing signal generation circuit 204〉taking-up time slot C, the timing signal S102 〈 ﹠﹠ that produces〉timing signal S102 is the same adapts with time slot C, therefore extract control bit, and send to logical circuit 8 and carry out logical operation according to the output signal S104 of comparator with from the odd even control signal S107 that control bit extracts circuit 7 as odd even control signal S107 logical circuit 8, and provide represent this relay station and directly set out in advance to make arrangements between existence or do not have a signal S108 of error code.More specifically, if the output signal S104 of comparator is a non-signal that meets, this means producing an error code on certain point on the transmission line.If control bit extracts the output signal S107 of circuit 7, just meet the comparator output signal S104 that is inserted in the next stop among the time slot C and be one and meet signal at *, this means at this relay station with between directly setting out in advance to make arrangements error code has taken place.Otherwise, error code has taken place before output signal S107 is the non-signal that meets, and this means direct next stop.After this manner, whether signal S108 representative at this relay station with between directly setting out in advance to make arrangements error code has taken place, and before perhaps directly setting out in advance to make arrangements whether error code has taken place, and signal S108 is sent to failure detector circuit 9 from this logical circuit 8.Failure detector circuit 9 represent this relay station to one and directly set out in advance to make arrangements between on the transmission line out of order signal S109 deliver to report to the police and display unit 11 on, this device is reported on operating personnel's transmission line fault and location of fault has been taken place.

The output signal S104 of comparator is sent to control bit and inserts circuit 10, sends to the relay station of back as a kind of control bit signal.According to timing signal S106, control bit inserts circuit 10 the control bit signal is inserted among the data-signal S100-1, therefore control signal is inserted among the time slot C.The data-signal of odd even control bit that comprises in time slot C respectively as mentioned above, and the parity check bit that comprises in time slot B is from output 2-1 ... 2-N exports, and is sent to the relay station of back by emitter 300.Each relay station between dispatching station and the receiving station all is equipped with channel monitoring circuitry as described above, and the circuit composition of these channel monitoring circuitries and operating principle are as mentioned above.Failure alarm signal S109 in each relay station is used for the wireless section between wireless section between two adjacent relay stations or relay station and the transmitting terminal station or the fault alarm of a wireless section between relay station and the receiving end station.Failure alarm signal S105 can be used as a kind of information that transmission channel is switched between the terminal station.

As mentioned above, it is novel to the invention provides, and not only can detect the fault between sending terminal station and the receiving terminal station, and the channel monitoring circuitry of the digital radio system of position that can detection failure.

Claims

1, one is used for wireless digital transmission system relay station information monitoring circuit, and it comprises:

An input is presented to this input by the digital input signals that described relay station receiving system comes;

One is connected described input, is used for counter that the marking signal number that is contained in the data segment with predetermined number of time slot is counted,

One is connected described input, is used for extracting from described input signal the check digit extraction circuit of parity check bit;

A comparator that is used for the output signal of more described counter and described check digit extraction circuit;

First failure detector circuit in response to the output signal of described comparator, this circuit are used to detect the fault on the described transmission system between dispatching station and the described relay station;

The invention is characterized in:

One is used for the output signal of described comparator is inserted into described input signal, and the control bit that plays the effect of odd even control bit inserts circuit; One is connected to described control bit insertion circuit, is used for the described input signal that inserts described odd even control bit is sent to the output of described relay station dispensing device;

A control bit extraction circuit that is used for extracting described control bit from described input signal;

A logical circuit, described control bit extracts the output signal of circuit and the output signal of described comparator is presented to this circuit, and this circuit logic is handled these output signals, produces the signal that representative is broken down; With second failure detector circuit in response to the output signal of described logical circuit, this circuit is used for detecting the fault of the transmission system between described relay station and its direct next stop.

2, according to the channel monitoring circuitry of claim 1, its feature is that also described input and output have N parallel terminal, and except an input terminal and lead-out terminal, all the other terminals all are directly to link to each other; A described input terminal is connected to described check digit and extracts on the input of circuit, described control bit extraction circuit and the described control bit insertion circuit, and a described lead-out terminal then is connected to the output that described control bit inserts circuit.

3, according to the channel monitoring circuitry of claim 1, it is further characterized in that and comprises that also of being connected to described first and second tracers reports to the police and display unit.