JP2003018069A - Communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication method that can realize transmission of information for relaying and transmission for acknowledgement by one transmission of a repeater in a radio transmission system, including the repeater. SOLUTION: A transmission station 2 attaches an identification code 6, denoting a sender to transmitted date and transmits the resulting data 7. When relaying devices 4a, 4b which receive the transmission date 7 detect the identification code denoting its own device included in the data, the repeaters 4a, 4b consider that the transmission date having been sent prior to reception to be normally received by another relaying device or a receiving station 3 and acknowledge the reception.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method,
More specifically, the present invention relates to a communication method used in a wireless transmission system having a repeater.

[0002]

2. Description of the Related Art A wireless transmission system is widely used because it does not require a laying of a transmission path and thus is more cost effective than a wired transmission system and is particularly suitable for transmission to a distant place. There is.

However, in order to enable transmission to a distant place, high-power radio transmission is required, but the output is regulated by the Radio Law or the like in consideration of the influence on other systems. In wireless transmission, direct transmission may be difficult due to the topography in the transmission route.

Under these circumstances, particularly in the case of wireless transmission to a distant place, a method of installing a repeater in the transmission path and relaying the transmission by the repeater is widely adopted. When relaying and transmitting by a repeater, it is common to perform relaying while confirming transmission / reception between each relay in order to reliably relay.

For example, when a signal containing information to be transmitted is transmitted from the first repeater to the second repeater,
Before the signal including the information to be transmitted is transmitted from the second repeater to the third repeater, the reception confirmation signal is transmitted from the second repeater to the first repeater. The first relay does not operate when receiving the reception confirmation signal from the second relay, but does not receive the reception confirmation signal from the second relay within a certain period of time. Considers that the transmission of the signal including the information to be transmitted is not normally received by the second relay device, and transmits the signal including the same information to be transmitted again.

As described above, since the signal containing the information to be transmitted is transmitted while confirming the reception between the repeaters, the information to be surely transmitted from the transmission source to the transmission destination is included. The transmitted signal can be relayed and transmitted.

[0007]

However, in each repeater, a time for transmitting a signal for confirmation of reception is required before transmitting a signal containing information to be transmitted, so that the transmission from the transmission source to the transmission destination is required. Transmission time becomes longer.

In addition, each relay also requires transmission of a reception confirmation signal, resulting in high power consumption. The present invention has been made to solve the above problems, and an object of the present invention is to reduce the transmission time from a transmission source to a transmission destination to a necessary minimum and to suppress an increase in power consumption. It is to provide a communication method using a machine.

[0009]

In order to achieve the above object, the invention according to claim 1 is a communication method used in a wireless transmission system having a repeater, wherein transmission for relay is reception. The point is that it also functions as a transmission for confirmation.

Therefore, since it is possible to realize the transmission of information for relay and the transmission for confirmation of reception by one transmission, both the information transmission time and the power consumption of the relay are minimized. can do.

According to a second aspect of the present invention, in the first aspect of the invention, the relay device transmits the transmission data by including the identification code of the relay device, and receives the data including the identification code. In the repeater, the reception confirmation is performed by confirming with the identification code that the repeater that has transmitted the data is the repeater that has received the transmission data transmitted before the reception. What to do was the gist.

Therefore, with a simple data structure, it is possible to realize a communication method capable of performing both transmission of information for relay and transmission for confirmation of reception by one transmission.

According to a third aspect of the present invention, in the second aspect of the invention, the transmission data includes identification codes of all the repeaters through which the transmission data passes, and the data including the identification code is received. In the relay device, the reception confirmation is performed by confirming that the received identification code of the relay device is included in the data, and the identification code of the received relay device is included in the data. If it is confirmed that the received relay device does not transmit the transmission data, the gist thereof is.

Therefore, when it is confirmed that the identification code of the relay station relayed is included in the data and the identification code of the relay station received is included in the data, the received relay station is Since the transmission data is not transmitted, it is possible to prevent the transmission data from circulating among the repeaters.

According to a fourth aspect of the present invention, in the invention according to the second aspect, a relay route is determined in the wireless transmission system, and the transmission data is transmitted as an identification code of the relay device. The gist is that only the identification code of the repeater that transmits the data is included.

Therefore, with a simpler data structure, it is possible to realize a communication method capable of performing both transmission of information for relay and transmission for confirmation of reception by one transmission. Further, it is possible to prevent multipath from the transmission source to the transmission destination.

A fifth aspect of the present invention is based on the fourth aspect, wherein the transmission data includes a code for designating a relay route. Therefore, the relay route can be flexibly changed without fixing the relay route.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment in which the present invention is embodied in a communication system having a repeater will be described below with reference to FIG.

As shown in FIG. 1, the communication system 1 includes a transmission station 2 as a transmission source, a reception station 3 as a transmission destination, and a repeater 4 a provided between the transmission station 2 and the reception station 3. 4b.

At the transmitting station 2, an identification code 6 representing the transmitting station 2 is added to the head of a code 5 obtained by encoding the information to be transmitted to the receiving station 3, and transmitted as transmission data 7.
In the repeater, in the identification code 6 of the received data,
When the identification code representing the relay is included, the data transmitted by the relay is regarded as having been received by another relay or the receiving station, and reception confirmation is performed.

If the data including the identification code representing the relay cannot be received within a fixed time after the data is transmitted by the relay, the transmitted data is transmitted to any relay or receiving station. The same data as the transmitted data is transmitted again assuming that the data has not been received.

In the repeater, if the identification code 6 of the received data does not include the identification code representing the relay, the identification code representing the relay is added to the beginning of the received data. It is added and transmitted as transmission data 7.

When data is received at the receiving station 3, an identification code 6 representing the receiving station is added to the beginning of the received data, and the data is transmitted as a reception confirmation signal 8. By performing the relay as described above, each relay can realize the transmission for the relay and the transmission for the confirmation of reception with one transmission.

Next, specific operations of the transmitting station 2, the relay station, and the receiving station 3 in the communication system 1 will be described with reference to the example shown in FIG. As shown in FIG. 1, in this example, there is one transmitting station 2 and one receiving station 3, and two repeaters 4a and 4b are installed between the transmitting station 2 and the receiving station 3. .

At the transmitting station 2, the information to be transmitted to the receiving station 3 is encoded, and further, at the beginning of the encoded information,
An identification code 6 representing the transmitting station 2 (here, the identification code representing the transmitting station is “S”) is added and transmitted as transmission data 7 (see FIG. 1A).

As shown in FIG. 1 (a), the transmission data 7 transmitted from the transmitting station 2 reaches the relay station 4a and the relay station 4a.
It is received by a. The repeater 4a determines whether or not the identification code 6 included in the received data includes the identification code representing the relay 4a.

In this case, since the identification code 6 is only "S" indicating the transmitting station, it is determined that the identification code 6 in the transmission data does not include the identification code indicating the repeater 4a. To do.

According to the above determination, the repeater 4a attaches an identification code indicating the repeater 4a (here, the identification code indicating the repeater 4a is "A") to the head of the received data, It is transmitted as transmission data 7 (see FIG. 1B).

As shown in FIG. 1B, the transmission data 7 from the relay 4a reaches the relay 4b and also reaches the transmitting station 2, and the transmission data 7 from the relay 4a is transferred to the relay 4b. And received at the transmitting station 2.

At the transmitting station 2, the identification code "S" representing the transmitting station 2 is included in the transmission data 7 from the repeater 4a.
Is included and the identification code “A” is added immediately after the identification code “S”, it can be confirmed that the data transmitted from the transmitting station 2 is normally received by the relay device 4a.

In the repeater 4b, since the transmission data 7 from the repeater 4a does not include the identification code representing the repeater 4b, the identification indicating the repeater 4b is added to the beginning of the received data. A code (here, the identification code representing the relay 4b is "B") is added, and the transmission data 7 is added.
(See FIG. 1C).

As shown in FIG. 1C, the transmission data 7 from the relay 4b reaches the receiving station 3 and also reaches the relay 4a, and the transmission data 7 from the relay 4b is transferred to the relay 4a. And is received at the receiving station 3.

In the repeater 4a, the transmission code 7 from the repeater 4b includes the identification code "A" representing the repeater 4a, and the identification code "A" immediately after the identification code "A". Since "B" is attached, it can be confirmed that the data transmitted from the relay device 4a is normally received by the relay device 4b.

Since the repeater 4a includes the identification code "A" indicating the receiver A in the received data, the repeater 4a does not retransmit the received data.
Therefore, the data is not repeatedly transmitted and received between the relays 4a and 4b.

At the receiving station 3, an identification code indicating the receiving station (here, the identification code indicating the receiving station 3 is "R") is added to the beginning of the received data, and the reception confirmation signal 8 is added. (See FIG. 1D).

As shown in FIG. 1D, the reception confirmation signal 8 from the receiving station 3 reaches the repeater 4b, is received by the repeater 4b, and is included in the received data, the repeater 4b.
It is confirmed that the data transmitted from the repeater 4b has been normally received at the receiving station 3 since the identification code indicating the is included. Therefore, the repeater 4b does not retransmit the received data.

When the transmitting station 2, the relay station 4a, and the relay station 4b cannot receive the data having the identification code of the transmitting station or the relay stations 4a and 4b within a certain time from the transmission of the data. Considers that the transmitted data has not been normally received by any of the repeaters or receiving stations, and transmits the same data again.

As described in detail above, according to the present embodiment, the following effects can be obtained. (1) Since the transmission of the data including the information to be transmitted once from the repeater also functions as the transmission of the reception confirmation signal, it is possible to reliably transmit the information without transmitting the reception confirmation signal separately. it can. Therefore, the time required for data transmission can be minimized, and the power consumption of the relay device can be minimized.

(2) The structure of the data transmitted by the transmitting station 2 and the repeaters 4a and 4b is the code 5 representing the information to be transmitted.
In addition, since the identification code 6 of the transmitting station 2 and the repeaters 4a and 4b is simply added, the data structure can be simplified.

(3) In the case where the transmitted data includes the identification codes representing all relayed relay devices, and the received data includes the identification code representing the received relay device, Since the received relay device does not transmit the transmission data, it is possible to prevent the transmission data from circulating among the plurality of relay devices.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in that a relay route is designated in advance.

The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the communication system 1 in this embodiment, the information transmission path from the transmitting station 2 to the receiving station 3 is predetermined. Then, in the transmitting station 2, the receiving station 3, and the repeaters 4a and 4b, the respective transmission sources and transmission destinations are stored.

The transmitting station 2 has a code 5 indicating information to be transmitted.
Is added to the beginning of the identification code 6 representing the transmitting station 2,
It is transmitted as transmission data 7. In the repeaters 4a and 4b, when the identification code 6 included in the received data is the identification code that is stored in the relay and represents the transmission source of the relay, the identification code that represents the transmission source. Is deleted, the identification code representing the relay is added to the head of the code representing the information, and is transmitted as the transmission data 7.

In the repeaters 4a and 4b, when the identification code included in the received data is the identification code stored in the repeater and indicating the transmission destination of the repeater, before the reception. The transmission data transmitted from the relay device is regarded as being normally received by the transmission destination, and reception confirmation is performed.

If the data including the identification code indicating the transmission destination of the repeater stored in the repeater cannot be received within a certain time from the transmission of the data by the repeaters 4a and 4b, The transmission is regarded as not normally received by the transmission destination, and the same data is transmitted again.

At the receiving station 3, the identification code included in the received data is deleted, the identification code representing the receiving station is added to the beginning of the data, and the reception confirmation signal 8 is transmitted.

Next, specific operations of the transmitting station 2, the repeaters 4a and 4b, and the receiving station 3 in the communication system 1 will be described with reference to the example shown in FIG. In this communication system 1, the transmission path of information is from the transmitting station 2 to the repeater 4
It is fixed as a → relay 4b → reception station 3. And
In the transmitting station 2, it is stored that the data transmission destination is the relay device 4a.

In the repeater 4a, the source of the data to be received is the transmitting station 2 and the destination of the data is the repeater 4b.
Is remembered. In the repeater 4b, it is stored that the source of the data to be received is the repeater 4a and the destination of the data is the receiving station 3.

In the receiving station 3, the source of the received data is stored as the repeater 4b. Transmitting station 2
Transmits the transmission data 7 by adding the identification code "S" indicating the transmitting station to the head of the code 5 indicating the information to be transmitted (see FIG. 2A).

As shown in FIG. 2A, the transmission data 7 from the transmitting station 2 reaches the relay station 4a and is received by the relay station 4a. In the repeater 4a, the identification code 6 is discriminated from the received data, and if the identification code "S" representing the transmission source which is the transmission source stored in the relay 4a, the identification code "S" is deleted. Then, the identification code "A" representing the relay 4a is added and transmitted as the transmission data 7 (see FIG. 2B).

As shown in FIG. 2B, the transmission data 7 from the relay station 4a reaches the transmission station 2 and the relay station 4b, and is received by the transmission station 2 and the relay station 4b. At the transmitting station 2, the identification code 6 included in the received data is discriminated, and the repeater 4a, which is the transmission destination stored in the transmitting station 2, is determined.
If the identification code is “A”, the data transmitted from the transmitting station 2 is regarded as having been normally received by the relay device 4a that is the transmission destination, and reception confirmation is performed.

On the other hand, in the repeater 4b, the identification code 6 included in the received data is discriminated, and if the identification code "A" representing the repeater 4a as the transmission source stored in the repeater 4b, it is concerned. The identification code “A” is deleted, the identification code “B” representing the relay 4b is added, and the transmission data 7 is transmitted (see FIG. 2C).

As shown in FIG. 2C, the transmission data 7 from the repeater 4b reaches the repeater 4a and the receiving station 4, and is received at the repeater 4a and the receiving station 4. Repeater 4a
In the above, the identification code 6 included in the received data is discriminated, and if the identification code “B” representing the relay station 4b as the transmission destination stored in the relay station 4a is “B”, the data transmitted from the relay station 4a is The reception confirmation is performed by assuming that the relay device 4b, which is the transmission destination, has received the data normally.

On the other hand, at the receiving station 3, the identification code 6 included in the received data is discriminated, and if the identification code "B" representing the repeater 4b which is the transmission source stored in the receiving station 3, it is concerned. The identification code “B” is deleted, the identification code “R” indicating the receiving place is added, and the reception confirmation signal 8 is transmitted (see FIG. 2D).

As shown in FIG. 2 (d), the reception confirmation signal 8 transmitted from the receiving station 3 reaches the repeater 4b and is received by the repeater 4b. The repeater 4b discriminates the identification code 6 included in the received data, and the identification code "R" indicating the receiving place 3 which is the transmission destination stored in the relay 4b.
If so, the transmission data transmitted from the repeater 4b is regarded as having been normally received at the receiving station which is the transmission destination, and reception confirmation is performed.

As described above in detail, according to the present embodiment, the following effect is obtained in addition to the effect of (1) above. (4) In addition to the code 5 representing the information, only the identification code 6 representing the transmission source to be transmitted is included, so that the data structure can be further simplified. This is particularly effective when the relay route is long.

(5) Since the relay route is predetermined, it is possible to prevent a so-called multipath in which a plurality of relay routes are formed between the transmitting station 2 and the receiving station 3. It is also possible to prevent the transmission data from circulating between the plurality of relays.

The present invention is not limited to the above embodiment, but may be implemented in the following modes, for example. In each of the first and second embodiments, there are two relays, but the number of relays is not limited to two,
The number may be one, or three or more.

In both the first and second embodiments, the transmission system from the transmitting station 2 to the receiving station 3 is in one direction, but the transmission system is not limited to one direction. It may be a bidirectional transmission system.

In the second embodiment, when a bidirectional transmission system is used, the relay route is fixed for each transmission direction, and the transmission station 2 and the reception station for each transmission direction. 3 and the repeaters 4a and 4b store the transmission source and the transmission destination and transmit the code indicating the transmission direction by including the code in the transmission data, or the transmission station 2 and the reception station 3 depending on the transmission direction. And repeater 4
The identification codes of a and 4b may be changed.

In the first and second embodiments, the position of the identification code 6 is the head of the code 5 representing the information to be transmitted, but the position is not limited to the head.
The position of the identification code may be anywhere in the transmission data 7.

In the first embodiment and the second embodiment, when the receiving station 3 receives the transmission data, the receiving station 3 receives the transmission data by adding an identification code indicating the receiving station 3 to the beginning of the transmission data. Transmit as confirmation signal 8, but receive confirmation signal 8
May be composed of only the identification code 6 representing the receiving station 3.

In the first and second embodiments, a check code (eg CR
(C code) is added, and when a data abnormality is detected at the time of reception, the received repeater 4a, 4b or the receiving station 3 adds an identification code to the transmission data 7 or the reception confirmation signal 8 and Information (NACK) indicating abnormal reception may be added and transmitted.

In this case, in the repeaters 4a and 4b or the transmitting station 2 which have received the signal including the information indicating the abnormal reception,
When the data corresponds to the reception confirmation signal, the transmission data 7 is transmitted again, and when the data does not correspond to the reception confirmation signal, the data may not be transmitted.

In the first embodiment, a serial number according to the data may be added. The serial number may be added at the transmitting station 2 for each transmission, or may be added when different data is received at the receiving station 3.

By adding the serial number to the data, it is possible to prevent the duplicated data processing at the receiving station 3 when the same data is duplicately delivered to the receiving station 3 through different routes.

In the second embodiment, when there are a plurality of transmitting stations or receiving stations and the routes from the transmitting stations to the respective receiving stations have some overlapping portions, they are installed on the overlapping routes. The relay device may store the identification codes of the transmission source and the transmission destination corresponding to the overlapping routes.

In this case, at the transmitting station, the transmission data 7
By adding an identification code that indicates the receiving station that transmits the data, unnecessary transmission can be prevented at relay stations other than the relay station between the transmitting station and the receiving station that transmits the data. it can.

In the second embodiment, the relay route is fixed in advance. However, the relay route is not limited to being fixed in advance, and the relay route may be used when transmitting the transmission data 7 from the transmitting station 2. May be specified.

In this case, in the transmission data 7, the transmission station 2
In addition to the identification code 6 that represents, the code that specifies the transmission path is added. In addition, the transmitting station 2, the receiving station 3, and the repeaters 4
In a and 4b (hereinafter, referred to as "equipment"), it is not necessary to store the respective transmission sources and transmission destinations.

If the identification code included in the received data represents the equipment specified immediately before the equipment receiving the received data in the relay path included in the received data, the identification code is used. It is deleted, an identification code representing the received equipment is added, and the data is transmitted as transmission data.

Further, in the relay route included in the received data, the identification code included in the received data is
When the equipment specified immediately after the equipment that received the received data is indicated, the data transmitted by the received equipment before the reception is specified immediately after the received equipment on the relay route. In the equipment, the reception can be confirmed, assuming that it was received normally.

Further, instead of adding the equipment identification code to the transmission data 7, a count value is added to the transmission data 7 and the relay device 4a, 4b adds 1 to the count value when relaying. As a result, reception can be confirmed in the same manner as in the case where the identification code is added.

That is, in the transmission system,
Since the relay route is designated, it becomes clear which relay is in charge of each relay counting from the transmitting station. Therefore, the reception can be confirmed by confirming that the data is transmitted by the relay designated after the relay by the count value added to the data received by the relay.

Next, the technical idea which can be understood from the above-mentioned embodiment will be added below. (1) A reception confirmation method used in a wireless transmission system having a repeater, wherein transmission for relay is also used for reception confirmation.

(2) The relay device transmits the transmission data including the identification code of the relay device, and the relay device which receives the data including the identification code receives the identification code,
By confirming that the relay machine that has transmitted the data is the relay machine that has received the transmission data that was transmitted before the reception, the technical concept (1) of confirming the reception is achieved. How to confirm the receipt.

(3) The transmission data includes the identification codes of all the relays through which the transmission data passes, and in the relay which has received the data including the identification code, the transmission data of the received relays is included in the data. The reception confirmation method according to (1) of the technical idea, which confirms that the transmission is performed before the reception by the reception relay device by confirming that the identification code is included.

(4) In the wireless transmission system,
A relay route is determined, and the transmission data includes only the identification code of the relay device that transmits the transmission data as the identification code of the relay device. By confirming that the code is the identification code representing the relay designated immediately after the received relay in the relay route, the reception of the transmission made before the reception by the received relay is received. The reception confirmation method described in (1) of the technical idea for confirmation.

(5) The transmission data also includes a code for designating a relay route, and in the relay station which has received the transmission data, the identification code indicates the received relay station in the designated relay route. Immediately after that, by confirming that it is the identification code indicating the designated relay, the reception confirmation of the transmission made before the reception by the received relay is performed. Receipt confirmation method.

(6) A data structure used in the communication method according to claim 1, wherein the data structure includes an identification code indicating a relay device to be transmitted. (7) A data structure according to (6) of the technical idea, characterized in that the data structure includes an identification code representing a relay for all relayed relays.

(8) The data structure used in the communication method according to claim 1, wherein a relay route is specified in advance, and the transmission relay device is used as an identification code indicating the transmission relay device. A data structure characterized by containing only an identifying code.

(9) A data structure according to (8) of the technical idea, characterized in that it also includes a code designating a relay route.

[0083]

According to the present invention, in a communication system having a repeater, the reception confirmation and transmission at the repeater are not required, so that it is possible to minimize the information transmission time and at the same time, for each repeater. Since only one transmission is required, the power consumption of each repeater can be minimized.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the operation of the first embodiment.

FIG. 2 is a schematic diagram showing the operation of the second embodiment.

[Explanation of symbols]

1 ... Communication system as wireless transmission system, 4a, 4
b ... Repeater, 6 ... Identification code, 7 ... Transmission data.

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Claims (5)

[Claims] 1. A communication method used in a wireless transmission system having a repeater, wherein transmission for relay also functions as transmission for confirmation of reception. 2. The relay device, wherein the relay device transmits the transmission data including an identification code of the relay device, and receives the data including the identification code,
With the identification code, the relay device that transmitted the data,
By confirming that the received relay device is the relay device that has received the transmission data transmitted before the reception,
The communication method according to claim 1, wherein reception confirmation is performed. 3. The transmission data includes identification codes of all the relay devices through which the transmission data has passed, and the relay device which receives the data including the identification code,
The reception was confirmed by confirming that the received data includes the received repeater identification code, and it was also confirmed that the received data included the received repeater identification code. In this case, the communication method according to claim 2, wherein the received relay device does not transmit the transmission data. 4. In the wireless transmission system, a relay route is determined, and the transmission data includes only an identification code of a relay that transmits the transmission data as an identification code of the relay. Item 2. The communication method according to Item 2. 5. The communication method according to claim 4, wherein the transmission data also includes a code designating a relay route.