JPH11239118A - Communications system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect the occurrence of burst on the side of a receiver and to improve the stability and reliability of a communications system by continuously outputting packets from a transmitter. SOLUTION: A packet copy part 201 of a transmitter 107 copies a packet 204 into two packets and outputs them as a continuous burst 230 composed of UW transmission data 1-CRC and transmission data 2-CRC while adding a header through a burst part 105 to a packet 202 connecting these packets. When two continuos bursts are inputted to a receiver 113 while colliding at certain timing, an error detecting and decoding part 10 detects an error from disability in the detection of UW caused by synthesizing the UW of the following burst with the transmission data of the preceding continuous burst, inputs an error detecting signal 205 to a burst collision detecting part 206, judges the reception condition of the continuous burst by integrating this detecting signal and outputs the result as a collision detecting signal 207. Even when data on one side collide, communication is effectively enabled with data on the other side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for performing communication using a TDMA system.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a communication system for performing communication using a TDMA system. FIG. 7 is a configuration diagram illustrating a configuration of a communication system that performs communication using the TDMA method.
In FIG. 7, reference numeral 101 denotes a data transmission unit, which outputs transmission data 102. Reference numeral 103 denotes an error detection encoding unit, and the transmission data 10 output from the data transmission unit 101
2 is input. Then, the error detection coding unit 103
Outputs a transmission packet 104 in which a check code is added to the input transmission data 102. The check code added to the transmission data 102 by the error detection coding unit 103 includes a check code such as a CRC code.

[0005] Reference numeral 105 denotes a burst transmission unit to which the transmission packet 104 output from the error detection coding unit 103 is input. Then, the burst transmission unit 105 outputs a transmission burst 106 in which a header is added to the input transmission packet 104. The header added to the transmission packet 104 by the burst transmission unit 105 includes a unique word (hereinafter, referred to as UW). Reference numeral 107 denotes a transmitter, which includes a data transmission unit 101, an error detection encoding unit 103, and a burst transmission unit 105.

Reference numeral 108 denotes a burst receiving unit, to which the transmission burst 106 output from the burst transmitting unit 105 is input. Then, the burst receiving unit 108 outputs a received packet 109 in which the header is removed from the input transmission burst 106. Reference numeral 110 denotes an error detection decoding unit to which the received packet 109 output from the burst receiving unit 108 is input. Then, the error detection decoding unit 1
10 outputs the reception data 111 from which the check code added to the input reception packet 109 is removed.

The error detecting / decoding section 110 checks the input received packet 109 based on a check code added to the input received packet 109, and an error occurs in the received packet 109. Check if it is. Reference numeral 112 denotes a data receiving unit to which the received data 111 output from the error detection decoding unit 110 is input. Reference numeral 113 denotes a receiver, which is a burst receiving unit 10
8. Error detection decoding unit 110 and data receiving unit 112
Having.

[0006]

In a conventional communication system using the TDMA system, even if a synchronization deviation occurs between a transmitter and a receiver and a burst collision occurs between a plurality of bursts, the burst collision occurs. Could not be detected. Further, since it is impossible to detect the generated burst collision, it is difficult to avoid the loss of burst data due to the burst collision.

[0007] The present invention has been made in view of these problems, and it is possible to detect whether burst collision has occurred on the receiver side by continuously transmitting and outputting transmission packets output by the transmitter. An object of the present invention is to obtain a communication system that can perform the communication. Another object of the present invention is to provide a communication system in which a transmitter continuously transmits transmission packets and outputs the same, so that even if a burst collision occurs, loss of burst data can be avoided.

[0008]

SUMMARY OF THE INVENTION A communication system according to the present invention provides a duplication unit for duplicating packet data, and integrates the duplicated data of the packet data duplicated by the duplication unit with the packet data and outputs it as a transmission burst. A transmitter having a burst transmission unit, a transmission burst is input, and error detection is performed on packet data and duplicate data constituting the transmission burst, respectively, and the packet data and the duplicate data are associated with the assembling order in the transmission burst. The receiver includes an error detection unit that outputs a detection result of error detection, and a receiver that includes a transmission state determination unit that determines a transmission state of a transmission burst based on the detection result.

Further, a communication system according to the present invention comprises:
A transmitter having a duplication unit for duplicating packet data, a burst transmission unit for integrating the first and second duplicated data of the packet data duplicated by the duplication unit and the packet data and outputting as a transmission burst, and a transmission burst Is input, error detection is performed on the packet data constituting the transmission burst and the first and second duplicate data, respectively, and the packet data and the first and second duplicate data are associated with the assembling order in the transmission burst. And a receiver having a transmission state determining unit for determining a transmission state of a transmission burst based on the detection result.

Further, the communication system according to the present invention outputs a duplication unit for duplicating the packet data, duplicate data of the packet data duplicated by the duplication unit at a first frequency, and outputs the packet data at a second frequency. A transmitter having a burst transmission unit for outputting, and duplicate data and packet data are input, error detection is performed on each of the packet data and the duplicate data, and error detection is detected in association with the input order of the packet data and the duplicate data. An error detection unit that outputs a result, and a receiver that includes a transmission state determination unit that determines a transmission state of a transmission burst based on the detection result.

Further, a communication system according to the present invention comprises:
A transmitter having a duplication unit for duplicating the packet data, a burst transmission unit for integrating the duplicated data of the packet data duplicated by the duplication unit and the packet data and outputting it as a transmission burst; A data dividing unit that similarly divides the packet data and the duplicate data constituting the data, a data combining unit that outputs a combined packet data obtained by combining the divided data obtained by the data dividing unit, and a data combining unit An error detection unit that performs error detection on the combined packet data output from the unit and outputs a detection result of the error detection in association with a combination state of the divided data forming the combined data, and a transmission burst based on the detection result. And a receiver having a transmission state determination unit for determining a transmission state. Than it is.

Further, in the communication system according to the present invention, the data dividing unit divides the input packet data and the duplicated data into respective predetermined data lengths, and the data synthesizing unit divides each of the divided data obtained by the data dividing unit. This is to create and output composite packet data by combining data with a predetermined data length.

Further, a communication system according to the present invention comprises:
The transmission state determination unit of the receiver determines a transmission state of a transmission burst output from the transmitter based on a detection result output from an error detection unit included in the receiver, and outputs the determination result to the transmitter. It is.

Further, in the communication system according to the present invention, the packet data is used for a unique word known by the transmitter and the receiver, the transmission data as a data body desired to be transmitted, and an error detection on the receiver side. Check code.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 TD according to the invention
An embodiment of a communication system that performs communication using the MA method will be described with reference to FIG. FIG. 1 is a configuration diagram illustrating a configuration of the communication system according to the first embodiment. In FIG.
Reference numeral 1 denotes a packet duplication unit to which the transmission packet 104 output from the error detection encoding unit 103 is input. Then, the packet duplication unit 201 duplicates the input transmission packet 104, and
, And outputs a continuous transmission packet 202. In addition,
One of the two transmission packets 104 obtained by duplication corresponds to duplicated data.

The burst transmission section 105 outputs the continuously transmitted packet 202 output from the packet duplication section 201.
Is entered. Then, this burst transmission unit 105
A continuous transmission burst 203 in which a header is added to the input continuous transmission packet 202 is output to the transmission path. The transmitter 107 includes a data transmission unit 101, an error detection encoding unit 103, a packet duplication unit 201, and a burst transmission unit 1
05.

The burst receiving section 108 receives the continuous transmission burst 203 output from the burst transmitting section 105. Then, the burst receiving unit 108 synchronously captures the continuous transmission burst 203 that has been input, and outputs a continuous transmission / reception packet 204 with the header removed from the continuous transmission burst 203.

The continuous transmission / reception packet 204 output from the burst reception unit 108 is input to the error detection decoding unit 110. Then, error detection decoding section 110 outputs error detection signal 205 and received data 111 based on input continuous transmission / reception packet 204. The error detection signal 205 indicates a detection result of the error detection performed on each of the received packets continuously transmitted to the error detection decoding unit 110 and input. This error detection signal 205 is
Output for each received packet for which error detection is performed. This error detection is performed based on a check code added to each received packet.

The received data 111 is obtained by decoding a received packet from which no error has been detected, from a received packet continuously transmitted and input to the error detection decoding unit 110. Reference numeral 206 denotes a burst collision detection unit which outputs an error detection signal 205 output from the error detection decoding unit 110.
, A burst collision detection signal 207 is output. The burst collision detection unit 206 corresponds to a transmission state determination unit. A collision signal receiving unit 208 receives the burst collision detection signal output from the burst collision detection unit 206.

The receiver 113 includes a burst receiving unit 108,
It has an error detection decoding unit 110, a data reception unit 112, a burst collision detection unit 206, and a collision signal reception unit 208. In FIG. 1, the same or corresponding parts as those in the conventional example shown in FIG.
The part different from FIG. 7 has been described.

Next, a method of detecting a burst collision when two consecutively transmitted bursts collide at a certain timing and are received by the receiver 113 will be described with reference to FIG. FIG. 2 is a conceptual diagram showing transmission timings of two continuous transmission bursts. For example, it is assumed that a first continuous transmission burst and a second continuous transmission burst are output to a transmission path.

Note that the first continuous transmission burst is UW
1, transmission data M1, CRC1, transmission data M2, and CRC2, which are output from the transmitter in the order described above. The contents of the transmission data M1 and the transmission data M
2 is the same. Therefore, the contents of CRC1 corresponding to transmission data M1 and CRC2 corresponding to transmission data M2 are the same.

Also, the second continuous transmission burst is UW
2, transmission data N1, CRC3, transmission data N2, and CRC4, and are output from the other transmitters in the order described above. The contents of the transmission data N1 and the transmission data N
2 is the same. Therefore, the contents of CRC3 corresponding to transmission data N1 and CRC4 corresponding to transmission data N2 are the same.

Note that UW1-2 are known data in both the transmitter 107 and the receiver 113, and these UW1-2 are known.
2, receiver 113 captures the first and second continuous transmission bursts. The transmission data and the data length of the CRC constituting the first and second continuous transmission bursts are also known to the transmitter 107 and the receiver 113.

Therefore, the receiver 113 determines that there is a CRC at a predetermined position based on the positions of UW1 and UW2, and extracts data. Also, this receiver 113
Error detection is performed by using data located at a predetermined position based on W1 and W2 as transmission data and similarly using data extracted on the basis of UW1 and UW2 as a CRC.

At a certain timing of the first continuous transmission burst in such a state, the first continuous transmission burst and the second continuous transmission burst are superimposed, and the transmission data of the first continuous transmission burst is temporarily assumed. Assume that M2 and CRC2 are superimposed on UW2 and transmission data N1 of the second continuous transmission burst and received by the receiver. At this time, the transmission data M2 and CRC2 of the first continuous transmission burst and the UW2 and transmission data N1 of the second continuous transmission burst are combined with each other at the same timing, and the data content changes.

At this time, UW2 of the second continuous transmission burst
Is combined with the transmission data M2 of the first continuous transmission burst, and the data content changes, so that the data changes to data unknown to the receiver 113, and the receiver 113 cannot capture the second continuous transmission burst. . The transmission data M2 and CRC2 of the first continuous transmission burst are combined with UW2 and transmission data N1 of the second continuous transmission burst, and the data content of the transmission data M2 changes. 110 detects that an error has occurred.

However, since the error detection processing is performed for each transmission data constituting the first continuous transmission burst, an error is detected in the error detection relating to the transmission data M1 and CRC1 of the first continuous transmission burst. Instead, the error detection decoding unit 110 outputs an error detection signal 205 indicating that the transmission data M1 has been normally received.

The error detection signal 205 output from the error detection decoding unit 110 is input to the burst collision detection unit 206, and is recorded for each transmission data in the transmission order constituting the first continuous transmission burst. . Note that the first continuous transmission burst is periodically received by the receiver 113, and the burst collision detection unit 206 integrates the input error detection signal 205, and the integrated error detection signal 205 Thereby, the reception status of the first continuous transmission burst can be determined.

For example, as a result of error detection on transmission data in which the transmission order in one continuous transmission burst is first and second, the probability of occurrence of an error in the first transmission data is sufficiently low even though the error occurrence probability of the first transmission data is sufficiently low. When the error occurrence probability of the transmission data is very high, it is determined that there is a high possibility that another continuous transmission burst collides with the end of the continuous transmission burst. If the error occurrence probabilities for a plurality of transmission data are uniformly low, it is determined that the reception level of the transmission path is low. These determination results are output from the burst collision detection unit 206 as a burst collision signal 208.

As described above, the transmitter 107 of the present embodiment
Duplicates the transmission packet 104, concatenates these two transmission packets and transmits them, and furthermore, the receiver 11 of this embodiment
3 can detect the occurrence of burst collision and a decrease in the reception level of the transmission path by detecting errors in each of the two received transmission packets, and stabilize the communication between the transmitter 107 and the receiver 113. As a result, communication reliability can be improved. Note that such a burst collision detection method is used when the transmitter 107 and the receiver 113 each have a clock that should point to a common time, and when the times indicated by both clocks slightly deviate. Especially effective.

In this embodiment, the transmission data 102
The transmission packet 104 is copied from the transmitter 107 as a continuous transmission burst by adding UW to the continuous transmission packet 202 obtained by continuously transmitting these transmission packets 104. However, the transmission packet composed of the transmission data 102, the UW, and the check code may be duplicated, and a continuous transmission packet obtained by continuously transmitting these transmission packets may be output from the transmitter 107 as a continuous transmission burst. . That is, the continuous transmission burst at this time is UW, transmission data, CRC,
It is composed of the order of UW, transmission data, and CRC.

As described above, by continuously transmitting the UW,
Even if one UW in one continuous transmission burst is deteriorated due to a burst collision and cannot be captured by the receiver 113, the continuous transmission burst can be captured based on the other UW. Therefore, communication by continuous transmission burst is effectively performed, and the stability and reliability of communication are further improved.

Embodiment 2 FIG. 3 shows another embodiment of a communication system for performing communication using the TDMA system according to the present invention.
This will be described with reference to FIG. FIG. 3 is a configuration diagram illustrating a configuration of the communication system according to the second embodiment. In FIG. 3, packet duplicating section 201 duplicates transmission packet 104 input from error detection encoding section 103 and
4 to output a triple transmission packet 301.

The burst transmission unit 105 outputs the triple transmission packet 30 output from the packet duplication unit 201.
1 is input. Then, the burst transmission unit 105
Outputs a triple transmission burst 302 in which a header is added to the input triple transmission packet 301 to the transmission path.
The burst receiving unit 108 receives the triple transmission burst 302 output from the burst transmitting unit 105. The burst receiving unit 108 synchronously captures the input triple transmission burst 302 and removes a header from the triple transmission burst 302 to remove the header.
3 is output.

The error detection decoding unit 110 receives the triple transmission / reception packet 303 output from the burst reception unit 108. The error detection decoding unit 110 performs an error detection process on each of the three received packets, and outputs an error detection signal 20 corresponding to each of the three error detection processes.
5 is output to the burst collision detection unit 206. Further, the error detection decoding unit 110 receives the received data 111 obtained by decoding the normally received packet based on the error detection processing performed on the three input received packets.
Is output to the data receiving unit 112. In FIG. 3, the same or corresponding portions as those in the first embodiment shown in FIG.
The same reference numerals are given and the description is omitted, and the portions different from FIG. 1 are described.

Next, a method of detecting a burst collision when two consecutively transmitted bursts collide at a certain timing and are received by the receiver 113 will be described. Receiver 113
The error detection signal 205 output from the error detection decoding unit 110 is input to the burst collision detection unit 206 and recorded for each transmission data 102 in the transmission order constituting the triple transmission burst 302. Burst collision detector 2
Reference numeral 06 accumulates the error detection signal 205 input periodically and judges the reception status of the triple transmission burst.

As a result of the error detection for the transmission data in the first, middle, and rear order in a certain continuous transmission burst, the error probability of the transmission data in the first and middle transmission data is low even though the probability of occurrence of the error is sufficiently low. When the error occurrence probability of the forward transmission data is very high, or when the error occurrence probability of the middle transmission order and the rearward transmission data is extremely high despite the error occurrence probability of the first transmission data being sufficiently low. It is determined that there is a high possibility that another continuous transmission burst collides with the continuous transmission burst. The method of detecting a burst collision in the receiver 113 according to the second embodiment is described in the first embodiment.
The description of the same or corresponding parts as those in the first embodiment is omitted, and the parts different from the first embodiment are described.

As described above, the transmitter 107 of the present embodiment
Duplicates the transmission packet 104, concatenates these three transmission packets and transmits them,
3 can detect the occurrence of burst collision and a decrease in the reception level of the transmission path by detecting errors of the three received transmission packets, and can stabilize the communication between the transmitter 107 and the receiver 113. As a result, communication reliability can be improved.

In this embodiment, the transmission data 102
The transmission packet 104 is copied from the transmitter 107 as a continuous transmission burst by adding UW to the continuous transmission packet 202 obtained by continuously transmitting these transmission packets 104. However, the transmission packet composed of the transmission data 102, the UW, and the check code may be duplicated, and a continuous transmission packet obtained by continuously transmitting these transmission packets may be output from the transmitter 107 as a continuous transmission burst. . That is, the continuous transmission burst at this time is UW, transmission data, CRC,
UW, transmission data, CRC, UW, transmission data, and C
It is configured in the order of RC.

As described above, by continuously transmitting the UW,
Even if the leading and trailing UWs in one continuous transmission burst are deteriorated due to the burst collision and cannot be captured by the receiver 113, the continuous transmission burst is captured based on the middle UW. Is possible, the communication by the continuous transmission burst is effectively performed, and the stability and reliability of the communication are further improved. The same effect can be obtained even if the number of transmission packets constituting one continuous transmission burst is four or more.

Embodiment 3 FIG. 4 shows another embodiment of a communication system for performing communication using the TDMA system according to the present invention.
This will be described with reference to FIG. FIG. 4 is a configuration diagram illustrating a configuration of the communication system according to the third embodiment. In FIG. 4, burst transmitting section 105 adds a header to continuous transmission packet 202 input from packet duplicating section 201 and outputs the packet. The continuous transmission burst 401 output from the burst transmission unit 105 outputs the first transmission packet constituting the continuous transmission burst 401 at the first carrier frequency (f1), and outputs the subsequent transmission packet. The second carrier frequency (f
Output in 2).

It should be noted that there is a slight temporal break during which no data transmission is performed between the output of the first transmission packet and the output of the rear transmission packet. However, by keeping the break time constant,
Integration of the continuous transmission burst 401 is performed. When the burst receiving section 108 synchronously captures the UW of the continuous transmission burst 401, the burst reception section 108 receives the transmission packet in the forward order of the continuous transmission burst. After that, the burst receiving unit 108 switches the frequency for receiving the continuous transmission burst, and receives the transmission packet in the rear sequence of the continuous transmission burst.

In FIG. 4, the same or corresponding parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. The parts different from FIG. 1 will be described. The method of detecting a burst collision in the receiver 113 of the third embodiment is the same as that of the first embodiment, and a description thereof is omitted.

As described above, the transmitter 107 of the present embodiment is used.
Outputs the first transmission packet at the first carrier frequency (f1) and outputs the second transmission packet to the second carrier frequency (f1) in the continuous transmission burst 401 obtained by duplicating the transmission packet 104. Output at f2). On the other hand, receiver 1
The switch 13 switches between these two frequencies and receives the forward and backward transmission packets, so that collision with other continuous transmission bursts is easily avoided. This is because, while a subsequent transmission packet of one continuous transmission burst is carried at the second carrier frequency (f2), a transmission packet at the beginning of another continuous transmission burst is transmitted at the first carrier frequency (f2). The transport at f1) greatly contributes.

Further, since the transmitter 107 and the receiver 113 of the present embodiment perform frequency diversity for transmitting and receiving the same transmission packet at a plurality of frequencies, it is easy to withstand fading and the like. From these facts, communication between the transmitter 107 and the receiver 113 of the present embodiment becomes stable, and the reliability of communication is improved.

The continuous transmission packet 20 of the present embodiment
2, continuous transmission burst 401, and continuous transmission / reception packet 2
04 may connect three or more transmission packets 104. In the continuous transmission burst 401 at this time, the carrier frequency may be switched by the number of constituent transmission packets, or the carrier frequency corresponding to a plurality of transmission packets may be repeatedly used.

The receiver 113 of the present embodiment may be provided with the same number of receiving systems 402 as the number of carrier frequencies to be received. By providing a plurality of receiving systems 402 in one receiver 113, a plurality of types of communication can be performed simultaneously. One receiving system 402 includes a burst receiving section 108, an error detection decoding section 110 connected to the burst receiving section 108, a data receiving section 112 connected to the error detection decoding section 110, and an error detection decoding section 110. And a collision signal receiving unit 208 connected to the burst collision detecting unit 206.

Further, in the present embodiment, the transmission data 10
2 and a check code, the transmission packet 104 is duplicated, and UW is added to the continuous transmission packet 202 obtained by continuously transmitting these transmission packets 104, thereby being output from the transmitter 107 as a continuous transmission burst. However, the transmission packet composed of the transmission data 102, the UW, and the check code is duplicated, and a continuous transmission packet obtained by continuously transmitting these transmission packets is output from the transmitter 107 as a continuous transmission burst. Good. That is, the continuous transmission burst at this time is UW, transmission data, CRC,
It is composed of the order of UW, transmission data, and CRC.

Embodiment 4 FIG. 5 shows another embodiment of a communication system for performing communication using the TDMA system according to the present invention.
This will be described with reference to FIG. FIG. 5 is a configuration diagram illustrating a configuration of the communication system according to the fourth embodiment. In FIG. 5, reference numeral 501 denotes a packet division unit to which the continuous transmission / reception packet 204 output from the burst reception unit 108 is input. Also, the packet dividing unit 501 is configured to
A divided packet 502, which is similarly divided for each of the received packets making up No. 4, is output. In the received packet shown in FIG. 5, each received packet is divided into two, but may be further divided. The packet division unit 501
Corresponds to a data dividing unit, and each divided portion of the divided packet 502 corresponds to divided data.

Reference numeral 503 denotes a packet synthesizing unit to which each received packet of the divided packet 502 divided by the packet dividing unit 501 is input. Also, the packet synthesis unit 503
Combines the divided portions of the received packets so that their data contents do not overlap,
The combined packet 504 obtained by this combination is output. Note that the packet combining unit 503 corresponds to a data combining unit.

In this embodiment, the transmission packet T is first copied into a transmission packet T1 and a transmission packet T2 having the same transmission contents. When the transmission packet T1 is received by the receiver 113, it becomes a reception packet R1. Further, the transmission packet T2 becomes the reception packet R2. The data contents of the received packet R1 and the received packet R2 are the same. The received packet R1 is divided by the packet dividing unit 501 into a divided part R1a and a divided part R1b. Further, the received packet R2 is divided into a divided part R2a and a divided part R2b. Note that the received packet R
1 and the received packet R2 may be divided based on the data length of each received packet. When the subsequent divided portions of the received packets are combined, the packets are combined so that the data length of the combined packet matches the data length of the received packet.

The divided part R1a and the divided part R2a
Are the same, and the data contents of the divided part R1b and the divided part R2b are also the same. Therefore, in the packet combining unit 503, the divided parts R1a and R1b,
A divided part R1a and a divided part R2b, a divided part R2a and a divided part R1b, a divided part R2a and a divided part R2b,
Are combined to create four types of composite packets.
Note that the divided part R1a, the divided part R2a, the divided part R1
b and the divided portion R2b correspond to the divided data.

The error detection decoding unit 110 receives the combined packet 504 output from the burst receiving unit 108. The error detection decoding unit 110 performs an error detection process on each of the input combined packets 504 and outputs an error detection signal 205 corresponding to each of the error detection processes to the burst collision detection unit 206. The error detection decoding unit 110 decodes the received data 111 obtained by decoding the normally received combined packet 504 based on the error detection processing performed on the input combined packet 504.
Is output to the data receiving unit 112.

The receiver 113 includes a burst receiving section 108,
It has a packet division unit 501, a packet synthesis unit 503, an error detection decoding unit 110, a data reception unit 112, a burst collision detection unit 206, and a collision signal reception unit 208. In FIG. 5, the same or corresponding parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted, and the parts different from FIG. 1 will be described.

Next, a method of detecting a burst collision when two continuous transmission bursts collide at a certain timing and are received by the receiver 113 will be described. The error detection signal 205 output from the error detection decoding unit 110 is input to the burst collision detection unit 206,
Is recorded for each combination type.

For example, the divided part R1a and the divided part R2
An error is detected in the combined packet composed of the divided part R2a and the divided part R2b, and an error is detected in the composed packet composed of the divided part R2a and the divided part R2b. If no error is detected in the combined packet composed of the portion R1b, the portion common to the combined packets in which the error has occurred is the divided portion R2b. It is found that the error has occurred, and it is possible to limit the location where the error has occurred to even smaller divisions of each received packet.

The method of detecting a burst collision in the receiver 113 of the fourth embodiment is the same as that of the first embodiment, and the description of the same or corresponding parts as those of the first embodiment will be omitted. The different parts have been described.

As described above, the receiver 113 of the present embodiment
Divides each of the received packets constituting the continuous transmission / reception packet 204 and performs error detection based on a combined packet 504 obtained by combining the divided portions, thereby finely dividing the location where an error occurs into each received packet. It is possible to clarify only the part, and the communication between the transmitter 107 and the receiver 113 can be stabilized, and the reliability of the communication can be improved.

In this embodiment, even if an error occurs due to fading or the like between the divided part R1b and the divided part R2a constituting the continuous transmission / reception packet 204, the divided part R1a and the divided part R2b are constituted. Since the desired received data can be decoded by the combined packet, the error rate in the entire continuous transmission burst 203 can be reduced, the communication between the transmitter 107 and the receiver 113 is stabilized, and the reliability of the communication is improved. be able to.

Embodiment 5 FIG. 6 shows another embodiment of a communication system for performing communication using the TDMA system according to the present invention.
This will be described with reference to FIG. FIG. 6 is a configuration diagram illustrating a configuration of the communication system according to the fifth embodiment. In FIG. 6, burst collision detection section 206 outputs burst collision detection signal 207 based on error detection signal 205 output from error detection decoding section 110 to burst transmission section 105 and collision signal reception section 20.
8 and output.

As described above, when the burst collision detection signal 207 output from the burst collision detection section 206 is input, the burst transmission section 105 of the transmitter 107 temporarily suspends the transmission processing of the continuous transmission burst 203. Then, synchronization is confirmed between the transmitter 107 and the receiver 113, and correction is performed so that the synchronization timing between the transmitter 107 and the receiver 113 is matched.

When the first continuous transmission burst and the second continuous transmission burst have a burst collision,
The transmission timing of the first continuous transmission burst of the first transmitter and the transmission timing of the second continuous transmission burst of the second transmitter are confirmed, and the transmission timing of one transmitter is transmitted to the other. Dependent on the transmission timing of the device.

As means for notifying the burst collision detection signal 207 from the receiver 113 to the transmitter 107, radio communication may be performed using the TDMA system, or communication may be performed using another communication method. . In FIG. 6,
The same or corresponding portions as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted, and portions different from FIG. 1 will be described.

As described above, the transmitter 107 of this embodiment
Can adjust the transmission timing of the transmitter 107 or another transmitter having a burst collision, or the reception timing of the receiver 113, based on the burst collision detection signal 207 notified from the receiver 113.
The occurrence of burst collision can be easily avoided, communication between the transmitter 107 and the receiver 113 can be stabilized, and the reliability of communication can be improved.

[0066]

As described above, in the communication system according to the present invention, the duplication unit for duplicating the packet data, and the duplicated data of the packet data duplicated by the duplication unit and the packet data are integrated and output as a transmission burst. A transmitter having a burst transmitting unit that performs the transmission, a transmission burst is input, and error detection is performed on each of packet data and duplicate data constituting the transmission burst, and the packet data and the duplicate data are associated with an assembling order in the transmission burst. An error detection unit for outputting a detection result of error detection, and a receiver having a transmission state determination unit for determining a transmission state of a transmission burst based on the detection result, wherein the transmitter transmits two data having the same contents. Then, the receiver performs error detection on those two data in accordance with the order of reception, and at which position data fails By detecting the dolphin can detect degradation in the receiving level of the generation and transmission line burst collision, it is possible to improve the stability and reliability of the communication system.

Further, the communication system according to the present invention comprises:
A transmitter having a duplication unit for duplicating packet data, a burst transmission unit for integrating the first and second duplicated data of the packet data duplicated by the duplication unit and the packet data and outputting as a transmission burst, and a transmission burst Is input, error detection is performed on the packet data constituting the transmission burst and the first and second duplicate data, respectively, and the packet data and the first and second duplicate data are associated with the assembling order in the transmission burst. And a receiver having a transmission state determination unit for determining the transmission state of a transmission burst based on the detection result. Transmits one set of data, and the receiver performs error detection on the three sets of data according to the order of reception. The by detecting can detect degradation in the receiving level of the generation and transmission line burst collision, it is possible to improve the stability and reliability of the communication system.

Further, the communication system according to the present invention outputs the duplication unit for duplicating the packet data, the duplicated data of the packet data duplicated by the duplication unit at the first frequency, and outputs the packet data at the second frequency. A transmitter having a burst transmission unit for outputting, and duplicate data and packet data are input, error detection is performed on each of the packet data and the duplicate data, and error detection is detected in association with the input order of the packet data and the duplicate data. An error detection unit for outputting a result, and a receiver having a transmission state determination unit for determining a transmission state of a transmission burst based on the detection result, wherein the transmitter separates two data having the same contents from each other. By transmitting at the carrier frequency, collisions with other transmission bursts are easily avoided, and the stability of the communication system is improved. It is possible to improve the fine reliability.

Further, the communication system according to the present invention comprises:
A transmitter having a duplication unit for duplicating the packet data, a burst transmission unit for integrating the duplicated data of the packet data duplicated by the duplication unit and the packet data and outputting it as a transmission burst; A data dividing unit that similarly divides the packet data and the duplicate data constituting the data, a data combining unit that outputs a combined packet data obtained by combining the divided data obtained by the data dividing unit, and a data combining unit An error detection unit that performs error detection on the combined packet data output from the unit and outputs a detection result of the error detection in association with a combination state of the divided data forming the combined data, and a transmission burst based on the detection result. And a receiver having a transmission state determination unit for determining a transmission state. By dividing two pieces of data having the same contents forming a transmission burst and creating various combined data by changing the combination, the two data having the same contents forming the transmission burst can be connected. Even if a failure occurs, desired data can be received by a combination of other divided data, so that the error rate in the entire transmission burst can be reduced,
The stability and reliability of the communication system can be improved.

Further, in the communication system according to the present invention, the data dividing section divides the input packet data and the duplicated data into respective predetermined data lengths, and the data synthesizing section divides each of the divided data obtained by the data dividing section. Creates and outputs combined packet data by combining data into a predetermined data length. Dividing two data having the same contents constituting a transmission burst and creating various combined data by changing the combination Thus, even if a failure occurs in a connection portion between two pieces of data having the same contents constituting a transmission burst, desired data can be received by a combination of other divided data. Can be reduced, and the stability and reliability of the communication system can be improved.

Further, the communication system according to the present invention comprises:
The transmission state determination unit of the receiver determines a transmission state of a transmission burst output from the transmitter based on a detection result output from an error detection unit included in the receiver, and outputs the determination result to the transmitter. And the transmitter adjusts the transmission timing of the transmitter or another transmitter having a burst collision, or the reception timing of the receiver, based on the determination result regarding the collision determination of the transmission burst notified from the receiver. Therefore, occurrence of burst collision can be avoided, and stability and reliability of the communication system can be improved.

Further, in the communication system according to the present invention, the packet data is used for a unique word known by the transmitter and the receiver, the transmission data as the data body desired to be transmitted, and the error detection on the receiver side. The unique word is continuously transmitted by duplicating the packet data including the unique word, and one of the unique words in one transmission burst is altered by a burst collision, and Even if it is not captured, the transmission burst can be captured based on the other unique word, communication by the transmission burst is effectively performed, and the stability and reliability of the communication system are improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a communication system according to a first embodiment.

FIG. 2 is a conceptual diagram illustrating transmission timings of two continuous transmission bursts.

FIG. 3 is a configuration diagram of a communication system according to a second embodiment.

FIG. 4 is a configuration diagram of a communication system according to a third embodiment.

FIG. 5 is a configuration diagram of a communication system according to a fourth embodiment.

FIG. 6 is a configuration diagram of a communication system according to a fifth embodiment.

FIG. 7 is a configuration diagram of a communication system that performs communication using a conventional TDMA method.

[Explanation of symbols]

101 data transmission unit, 102 transmission data, 103
Error detection coding unit, 104 transmission packet, 105 burst transmission unit, 106 transmission burst, 107 transmitter,
108 burst receiver, 109 received packets, 11
0 error detection decoder, 111 received data, 112
Data receiving unit, 113 receiver, 201 packet duplicating unit, 202 continuous transmission packet, 203 continuous transmission burst, 204 continuous transmission / reception packet, 205 error detection signal, 206 burst collision detection unit, 207 burst collision detection signal, 208 collision signal Receiving section, 301 triple transmission packet, 302 triple transmission burst, 303
Triple transmission / reception packet, 401 continuous transmission burst, 40
2 Receiving system, 501 packet dividing unit, 502 divided packet, 503 packet combining unit, 504 combined packet.

Claims (7)

[Claims] 1. A transmitter comprising: a duplication unit for duplicating packet data; and a burst transmission unit for integrating the duplicated data of the packet data duplicated by the duplication unit and the packet data and outputting as a transmission burst. The transmission burst is input, error detection is performed on each of the packet data and the duplicated data constituting the transmission burst, and the error is associated with the assembly order of the packet data and the duplicated data in the transmission burst. A communication system comprising: an error detection unit that outputs a detection result of detection; and a receiver including a transmission state determination unit that determines a transmission state of the transmission burst based on the detection result. 2. A duplication unit for duplicating packet data, and a burst transmission unit for integrating first and second duplicate data of the packet data duplicated by the duplication unit and the packet data and outputting as a transmission burst. And the transmitter having the input, the transmission burst is input, and performs error detection on the packet data and the first and second duplicate data constituting the transmission burst, respectively, the packet data and the first and second An error detection unit that outputs a detection result of the error detection in association with an assembly order of the second duplicate data in the transmission burst; and a transmission state determination unit that determines a transmission state of the transmission burst based on the detection result. A communication system comprising: a receiver. 3. A duplication unit for duplicating packet data, and a burst transmission unit for outputting, at a first frequency, duplicate data of the packet data duplicated by the duplication unit, and outputting the packet data at a second frequency. The duplicated data and the packet data are input, error detection is performed on the packet data and the duplicated data, respectively, and the error detection is performed in association with the input order of the packet data and the duplicated data. A communication system comprising: an error detection unit that outputs a detection result of the transmission burst; and a receiver including a transmission state determination unit that determines a transmission state of the transmission burst based on the detection result. 4. A transmitter, comprising: a duplication unit for duplicating packet data; and a burst transmission unit for integrating the duplicated data of the packet data duplicated by the duplication unit and the packet data and outputting as a transmission burst. The transmission burst is input, and a data division unit that similarly divides the packet data and the duplicate data constituting the transmission burst, respectively, is obtained by combining the divided data obtained by the data division unit. A data combining unit that outputs the combined packet data
An error detection unit that performs error detection on the combined packet data output from the data combining unit, and outputs a detection result of the error detection in association with a combination state of the divided data forming the combined data; and A communication system comprising: a receiver having a transmission state determination unit configured to determine a transmission state of the transmission burst based on the detection result. 5. A data division unit divides input packet data and duplicate data by a predetermined data length, and a data synthesis unit divides each divided data obtained by the data division unit into a predetermined data length. The communication system according to claim 4, wherein the combined packet data is created and output in combination. 6. A transmission state judging section of a receiver judges a transmission state of a transmission burst output from a transmitter based on a detection result output from an error detection section of the receiver,
The communication system according to claim 1, wherein a result of the determination is output to the transmitter. 7. The packet data includes a unique word known by the transmitter and the receiver, transmission data as a data body desired to be transmitted, and a check code used for error detection on the receiver side. Claims 1 to 6
The communication system according to any one of the above.