JP2001257691A - Radio transmission method and radio transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio transmission method and a radio transmitter for improving the radio transmission efficiency and attaining the access control that is free from any collision of transmission of information. SOLUTION: In this radio transmission method, an information transmission request (RTS) signal 44 from an optional transmitter is transmitted to a network control station and then the transmission of information (Data) 46 is started by using an optional transmitter after a transmission enabling signal (GTS) signal 49 corresponding to the signal 44 is returned from a control station. Hence an information transmission method that is free from any collision of transmission of information against other transmitters is attained. Furthermore, it is possible to avoid the collision of information sent from other communication stations by transmitting again the request RTS after an optional time if the request RTS is not accepted by a transmitting station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio transmission method and a radio transmission which are preferably applied to, for example, transmitting a radio signal to various devices to form a local area network (LAN) between a plurality of devices. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, as an access control method in a centralized control type wireless network in which control stations are arranged, for example, a polling operation is sequentially performed from a control station to terminal stations on the network, and a terminal station having information transmission is used. In response to this, a method of occupying a transmission path has been considered.

Further, as an access control method in a distributed control type wireless network that does not require a control station, for example, a random access control method by carrier detection has been considered.

Further, a wireless LAN (local area
When a network is configured using a plurality of devices such as a network) system that cannot have a means for directly detecting a collision, a transmission request (RTS) is first sent from a transmission device to a reception device. : Request To
Send), and subsequently, the receiving-side device transmits a transmission acknowledgment (CTS: Clear) to the transmitting-side device.
r To Send), and a control method for notifying other devices existing in the vicinity that the transmission path is used has been considered.

FIG. 11 is a diagram showing an example of the configuration of a wireless transmission frame according to the conventional method. Here, a frame is defined and shown for convenience, but it is not always necessary to adopt such a frame structure. In the figure, a transmission frame arriving at a predetermined transmission frame period 110 is defined, and a management information transmission area 111 and an information transmission area 112 are provided therein.

[0006] At the beginning of this frame, a downlink management information transmission section (DM: Down Link Management) for reporting a frame cycle and network common information.
t) 113 is arranged, followed by, if necessary,
Uplink management information transmission section (UM: Up Link Man)
(Agment) 114 is disposed. DM is a downlink management area (frame synchronization area) including frame synchronization information, and UM is an uplink management area (node synchronization area).
A configuration is considered in which one is assigned to each of the communication stations constituting the network, and transmissions at a plurality of communication stations are prevented from colliding.

[0007] The information includes an area in which a band is reserved in the information transmission area, information on an asynchronous transmission area, and the like. That is, the information transmission area 112 is configured by the bandwidth reservation transmission area 115 set as needed, and the asynchronous transmission area 116 in the other parts.

In other words, if there is no need for bandwidth reservation transmission,
All of the information transmission area can be transmitted as an asynchronous transmission area.

By adopting such a frame structure, in the band reservation transmission area, for example, an isochronous (Iso
In the asynchronous transmission area where asynchronous transmission is performed, it is preferable to adopt a configuration in which asynchronous transmission or the like can be performed.

[0010]

In the polling control method described above, since the transmission path can be centrally managed by the control station, there is a danger that a collision occurs in which information transmission between a plurality of transmission devices overlaps. There was also the advantage that there was little.

[0011] However, there is a problem that the polling signal is transmitted on the transmission line even if the information transmission is not performed, which not only deteriorates the utilization efficiency of the transmission line but also makes it difficult to coexist with other wireless transmission systems. There was an inconvenience.

Further, the above-described random access control has an advantage that a radio transmission path can be used for another radio transmission system while transmission is not being performed.

However, since each transmission device cannot centrally manage the state of the transmission path, there is a high risk that information transmission from a hidden terminal station that cannot be recognized by its own station overlaps and that a collision occurs. There was an inconvenience.

Further, in the control method based on RTS / CTS applied to the wireless LAN system, the transmission acknowledgment (C
In the hidden terminal station that could not receive the TS), it was not possible to detect that the transmission line was occupied, so there was still the inconvenience that there was a risk that a collision would still occur. .

Therefore, the present invention has been made in view of the above points, and a radio transmission method and radio transmission capable of improving the efficiency of radio transmission and performing access control without collision of information transmission. It is an object to provide a device.

[0016]

Here, the radio transmission control method and radio transmission apparatus of the present invention are used as an access control method applied to a network in which a control station is present, first of all, a transmission side of a transmission side having an information transmission request. A transmission request (R
(TS) signal, the transmission device of the control station receiving the signal transmits a transmission permission (GTS) signal, notifies the network that the corresponding wireless transmission path is occupied, and transmits the transmission permission (GTS) signal. ) The access control is performed so that the transmission device that has received the signal starts information transmission.

Thus, the transmission device of the control station, which has received the transmission request (RTS) from the transmission device of the information transmission transmitting station, returns a corresponding transmission permission (GTS) to the transmission device of the transmitting station. , The use of the transmission path is permitted.

Then, when the information transmission is completed, the transmission device of the control station transmits a transmission line release notification (OTS) signal on the network so that the transmission line is simultaneously notified that the transmission line has been released. Access control.

That is, when the information transmission from the transmission device of the transmitting station is completed, a transmission path release notification (OTS) is transmitted by broadcast to the communication station on the network.

In the transmission apparatus from which the transmission apparatus receives the transmission permission (GTS) signal from the control station, the transmission apparatus receives the transmission permission (GTS) signal from the control station until the transmission path release notification (OTS) signal is received from the control station. Detects that it is occupied by information transmission of another transmission device, and performs transmission control so as to wait for information transmission from its own station.

Thus, in the transmission device of another communication station,
Until receiving the release notification, by recognizing that the transmission path is occupied, by waiting without transmitting information,
Collision can be prevented.

Even if the release notification (OTS) is missed, packet information transmitted as RTS / GTS includes information on the occupation time of the transmission line in order to avoid the restriction of access control. By transmitting without transmitting, when the occupation time has elapsed, transmission of a reply request (RTS) from the transmission device of another communication station can be accepted.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION
As an access control method for information transmission in a network system, a transmission request is transmitted from a transmitting station, and the control station transmits a transmission permission to notify that the transmission path is occupied,
When the information transmission from the transmitting station is completed, the control station transmits a transmission path release notification.

The present embodiment will be described below. FIG. 1 is a diagram illustrating a configuration example of a network system to which the wireless transmission method according to the present embodiment is applied. For example, as shown in FIG. 1, a personal computer 1 and a printer output device 2 are connected to the wireless transmission device 11 via a cable or the like by wire. A VTR (video tape recorder) 3 is similarly connected to the wireless transmission device 12 via a cable or the like. Similarly, the telephone device 5 and the set-top box 4 are connected to the wireless transmission device 13 via a cable or the like.
Is connected by wire. Similarly, the television receiver 6 and the game device 7 are connected to the wireless transmission device 14 via a cable or the like by wire. In this way, each device is connected to each wireless transmission device, and each wireless transmission device forms a network 15.

FIG. 2 is a diagram schematically showing a network connection form. In FIG. 2, a wireless network 1 composed of wireless transmission devices 11, 12, and 13 of terminal communication stations shown by white circles centering on a wireless transmission device 14 of the control station shown by black circles
5 has been formed. Wireless transmission device 1
1, a personal computer 1 and a printer output device 2 are connected as shown by solid lines. The VTR 3 is also connected to the wireless transmission device 12 as shown by a solid line. Similarly, the telephone 5 and the set-top box 4 are connected to the wireless transmission device 13 as indicated by solid lines. Similarly, the television receiver 6 and the game device 7 are connected to the wireless transmission device 14 as indicated by solid lines.

Here, in the wireless network 15, the control station 14 can communicate with all the communication stations 11 to 13 on the network 15 via the lines 22 to 24 shown by dotted lines.

On the other hand, although the communication station 11 cannot directly transmit data to the distant communication station 13, the control station 14 on the network 15 via the lines 22 and 21 shown by dotted lines.
The communication with the communication station 12 shows a possible state.

In the communication station 12, a line 2 indicated by a dotted line
Control station 1 on network 15 via 3, 21, 25
4, a state in which communication with the communication stations 11 and 13 is possible.

Although the communication station 13 cannot perform direct transmission with the distant communication station 11, the lines 24, 2
5, the control station 14 and the communication station 1 on the network 15
2 indicates that communication is possible. That is, in the network connection example shown in FIG.
1 and the communication station 13 are in a state of being hidden terminal stations from each other.

FIG. 3 shows a configuration example of the radio transmission devices 11 to 14 constituting each communication station. Here, each of the wireless transmission devices 11 to 14 basically has a common configuration, and includes an antenna 31 that performs transmission and reception, and a wireless transmission and reception processing unit 32 that is connected to the antenna 31 and performs wireless transmission processing and wireless reception processing. And wireless transmission with other transmission devices is possible.

In this case, as a transmission system in which transmission and reception are performed by the wireless transmission / reception processing unit 32 of this example, for example, O
FDM (Orthogonal Frequency)
A transmission method using a multicarrier signal called a Division Multiplex (orthogonal frequency division multiplexing) method is applied, and as a frequency used for transmission and reception, for example, a very high frequency band (for example, a 5 GHz band)
Is used.

In the case of this example, a relatively weak output is set for the transmission output. For example, when used indoors, wireless transmission over a relatively short distance of about several meters to several tens of meters can be performed. There is as much output.

The radio transmission / reception processing unit 32 has a mechanism for detecting a specific frequency carrier on a radio transmission path and detecting a synchronization signal. When the synchronization signal is received, an information portion following the synchronization signal is received. It has a configuration that can be used.

Further, of the signals received by the radio transmission / reception processing unit 32, processing of information (transmission request, transmission permission, release notification) used for access control, and processing of the radio transmission / reception processing unit 3
2 includes a transmission control processing unit 33 that performs an access control process (transmission of a transmission request) on the information signal to be transmitted.

An information conversion processing unit 34 for converting data of an information signal among the signals received by the radio transmission / reception processing unit 32 and data conversion of an information signal transmitted by the radio transmission / reception processing unit 32 is provided.

Further, the data is supplied from the information conversion processing section 34 to the connected equipment 39 via the interface section 35, and the data supplied from the connected equipment 39 is converted into the information conversion processing via the interface section 35. Part 3
4 for conversion processing.

Here, as an external interface of the interface unit 35 of the wireless transmission device, for example, IE
High-speed serial bus 3 such as EE1394 format
8, audio and video information or various data information can be transmitted and received to and from the connected device 39. Alternatively, the connected device 39
These wireless transmission devices may be configured to be built in the main body.

Each unit in the wireless transmission device is configured to execute processing based on control of a control unit 36 constituted by a microcomputer or the like.

In this case, when the signal received by the wireless transmission / reception processing unit 32 is a control signal such as access control information, the received signal is supplied to the control unit 36 via the transmission control processing unit 33. Then, the control unit 36 sets each unit to a state indicated by the received control signal.

The control unit 36 has an internal memory 37.
Is connected, and its internal memory 37 is configured to temporarily store data necessary for communication control, information on the number of communication stations constituting a network, information on how to use a transmission path, and the like.

In the transmission device 14 of the control station, the control unit 3
6 also transmits a synchronization signal and an access control signal (transmission permission and release notification) transmitted to the other transmission devices 11 to 13 from the control unit 36 to the wireless transmission / reception processing unit 32 via the transmission control processing unit 33. And wirelessly transmit.

In the control units 36 of the transmission devices 11 to 13 other than the control station, if the received signal is a synchronization signal, the control unit 36 determines the timing of receiving the synchronization signal, and The frame period is set based on the signal, and the communication control process is executed in the frame period.

Further, when the received signal is an access control signal (transmission request, transmission permission, release notification),
A predetermined access control operation is performed by the control unit 36 via the transmission control processing unit 33.

FIG. 4 is a diagram showing an example of transition of a temporal change sequence in each communication station in the access control method.

The transmission path utilization state shown in FIG. 4A represents the utilization state of the transmission path.
0 is transmitted, and then a transmission permission (GTS) 41 is transmitted, where the information transmission (Data) of the permitted transmitting station is performed.
42 is performed. Further, it shows that the transmission path open notification (OTS) 43 is transmitted when the information transmission is completed.

The transmitting station transmitting apparatus shown in FIG. 4B represents the operation of the transmitting station transmitting apparatus. The transmitting station transmits a transmission request (RTS) 44 indicated by the first hatched portion, and then transmits from the control station. After receiving the transmission permission (GTS) 45, information transmission (Data) 46 indicated by the following hatched portion is performed, and when the information transmission is completed, a transmission path release notification (OT)
S) 47 is received.

The control station transmission apparatus shown in FIG. 4C represents the operation of the control station transmission apparatus.
S) After receiving 48 and transmitting a transmission permission (GTS) 49 indicated by the first hatched portion, information transmission (Data)
When 50 is completed, it indicates that a transmission path release notification (OTS) 51 indicated by the following hatched portion is notified on the network.

The transmitting device of the receiving station shown in FIG. 4D represents the operation of the transmitting device of the receiving station.
S) Receiving 52 and permitting transmission from control station (GTS)
When the information transmission (Data) 54 is completed after receiving 53, it indicates that the transmission path open notification (OTS) 55 is to be received.

The receiving station transmitting apparatus shown in FIG. 4E represents the operation of the transmitting apparatus which is a hidden terminal station that cannot directly transmit to the transmitting station transmitting apparatus. ) Cannot be received, but the transmission permission (GTS) 56 from the control station can be received.

Thereafter, the transmission path release notification (OTS) 58
During the period until the information is received, an “information transmission standby section” 57 in which information cannot be transmitted is shown. When information transmission occurs in the "information transmission standby section" 57, a transmission request (RTS) 59 can be transmitted after receiving the release notification (OTS) 58 as indicated by a dotted line.

FIG. 5 is a flowchart showing the operation of information transmission in the transmission device of the transmitting station. First, in step S1, when a request for wireless transmission is received from the interface portion, it is determined in step S2 whether information transmission is possible on the transmission path.

Here, in step S2, if the frame structure is in the asynchronous transmission area and information transmission is possible, the transmission of the transmission request (RTS) is performed in step S3 from the YES branch. Do.

Further, in step S4, transmission permission (G
TS). Here, if the transmission permission (GTS) has not been returned, the process returns to step S2, and after a predetermined time has elapsed, the transmission request (RTS) is transmitted again in step S3.

If transmission permission (GTS) is returned in step S4, information transmission is performed in step S5, and if the corresponding information transmission is completed in step S6, the process is completed. If the information transmission has not been completed in step S6, the process returns to step S5 to perform information transmission until the information transmission is completed.

If it is determined in step S2 that the transmission of information is not possible after the transmission permission (GTS) signal of the other station has been received, the process branches to step S from NO.
At step S7, the release notification (OTS) is received, and at step S8, the elapse of the end time of the information transmission at the corresponding other station is determined.

If the release notification (OTS) is received in step S7 and if the end time of the information transmission in step S8 has elapsed, it is determined that the transmission path has become empty,
From the YES branch, a transmission request (RT
S) is transmitted.

FIG. 6 is a flowchart of the operation of access control in the transmission device serving as a control station.

First, when a transmission request (RTS) transmitted wirelessly is received in step S11, it is then determined in step S12 whether or not transmission is possible.

For example, if a transmission permission (GTS) has been sent to another transmission apparatus, the process is exited from the NO branch in step S12 without responding to this request.

If it is determined that transmission is possible while the transmission path is idle, the process proceeds to step S13 from YES branch in step S12, and transmission of the transmission permission (GTS) of the corresponding request is performed. Then, all the communication stations on the network are notified that the transmission path is occupied.

Then, in step S14, it is determined whether or not the information transmission of the corresponding transmission device has been completed.

This is because, for example, when it is determined that the information transmission has been completed by using a technique such as carrier detection, the process branches to YES in step S14 and then to step S1.
At step 5, an open notice (OTS) is transmitted, and all communication stations on the network are notified that the transmission path has been opened, and
The access control of a series of control stations ends.

FIG. 7 is a flowchart of a receiving operation in a general transmitting apparatus serving as a receiving station and a hidden terminal station. First, in step S21, it is determined whether or not the wirelessly transmitted transmission request (RTS) has been received, and in step S22, the wirelessly transmitted transmission permission (GTS) has been received. Is determined.

When either the transmission request (RTS) or the transmission permission (GTS) is received, it is recognized in step S23 that the information transmission from the own station has become impossible.

Further, in step S24, it is determined whether or not the own station is designated as a destination. here,
If the information is addressed to the own station, information reception processing is performed in step S25 from a YES branch.

Further, it is determined in step S26 whether or not the information transmission has been completed, and the reception processing in step S25 is continued until the information transmission is completed.

As an element of the determination of the end of the information transmission in step S26, the end of the transmission is determined by performing the carrier detection, or the release notification (OT) sent from the control station is performed.
From the reception of S), it may be determined that the information transmission has been completed.

Thereafter, in step S27, it is recognized that information transmission from the own station is enabled.

If it is determined in step S24 whether or not the information is addressed to the own station, and if the own station is not specified as the destination, the release notification (O
In step S29, it is determined whether or not the end time of the information transmission of another station has elapsed.

When the release notification (OTS) is received in step S28, and when the transmission end time has elapsed in step S29, it is determined that the transmission path has become idle, and the process proceeds to step S27 from the respective YES branches. Then, it is recognized that information transmission from the own station has become possible, and a series of information reception processing ends.

FIG. 8 is a diagram showing a configuration example of transmission request (RTS) information. In FIG. 8, an identifier 80 for identifying transmission request (RTS) information and a transmission station ID for specifying a transmission source station
81, a receiving station ID for designating a receiving source station, 82, unique information 83 such as transmission rate information for information transmission, a transmission end time, an information amount 84 to be transmitted, and the like are assumed.

In addition to this, information on a required transmission request (RTS) may be added as appropriate.

FIG. 9 is a diagram showing a configuration example of transmission permission (GTS) information. In FIG. 9, an identifier 90 for identifying transmission permission (GTS) information and a transmitting station ID for specifying a source station
91, a receiving station ID 92 for designating a receiving source station, unique information 93 such as transmission rate information for information transmission, a transmission end time, an information amount 94 to be transmitted, and the like are assumed. In addition to this, necessary transmission permission (GTS) information may be appropriately added.

FIG. 10 is a diagram showing a configuration example of release notification (OTS) information. In FIG. 10, the release notification (OTS)
An identifier 100 for identifying information, an area 101 defined as needed, and the like are assumed. In addition to the above, necessary information of an open notification (OTS) may be appropriately added.

It should be noted that the above-described embodiment is a wireless LAN
An example in which the present invention is applied to a system has been described. However, the present invention is not limited to this, and it goes without saying that the present invention is also applicable to other wireless networks.

[0076]

According to the radio transmission method of the present invention, a network is formed by using a plurality of transmission devices, and in a radio transmission method for transmitting information, an information transmission request (RTS) signal is transmitted from an arbitrary transmission device to the network. Send to the control station,
Waiting for the control station to return a transmission permission (GTS) signal corresponding to the corresponding transmission request (RTS) signal, and starting transmission of information from any transmission device, no collision of information transmission with another transmission device occurs. An information transmission method can be realized, and further, by transmitting a transmission request (RTS) again after an arbitrary time elapses when a transmission request (RTS) is not received at a transmitting station, This has an effect that collision with information transmission from another communication station can be avoided.

Further, in the wireless transmission method according to the present invention, in the above description, the control station of the relevant network, when receiving a transmission request (RTS) signal from any transmission device on the network, may set the transmission path free. If transmission is allowed (GT
S) Since a signal is returned, a transmission request (R
TS) by transmitting a transmission permission (GTS) at the control station to notify the entire network that the transmission path is occupied by specific information transmission.
Before receiving information, the receiving-side transmission device receives two transmission requests (RTS) from the transmission device of the transmission station and transmission permission (GTS) from the control station in advance, so that it is more reliable. Even if a transmission request (RTS) is transmitted from a plurality of transmitting stations at the same time, if the transmission information of the control station cannot correctly decode the corresponding information, a correct transmission permission (GTS ) Is not returned, so that information transmission from both transmitting stations is not started, and the effect of avoiding collision can be obtained.

In the above-mentioned radio transmission method according to the present invention, the control station of the network transmits an open notification (OTS) signal to the network when information transmission from any transmission device on the network is completed. I will send
By transmitting a release notification (OTS) from the control station at the end of transmission, it is possible to notify the entire network that the transmission path has been opened.
By transmitting information including the occupation time of the transmission path in the packet information transmitted as S, even in other transmission devices in a state of being a hidden terminal station from the transmission side transmission device, Even if the release notification (OTS) is missed, it is possible to obtain a method of allowing the transmission of the transmission request (RTS).

Further, according to the wireless transmission method of the present invention, in the above, when any transmission device receives a transmission permission (GTS) signal for another transmission device from the control station,
Since information transmission is waited until the release notification (OTS) signal is received, other communication stations in a state of being a hidden terminal station from the transmission station can also receive the transmission permission (GTS) from the control station. Since it is possible to know that the transmission path is occupied, it is possible to prevent collision of information transmission with the hidden terminal station, and to miss both the transmission request (RTS) and the transmission permission (GTS). Even if a transmission request (RTS) is transmitted from the third communication station, the control station does not send a transmission permission (GTS), so that information transmission from the third communication station is not started. In other words, there is an effect that, although a collision occurs in information transmission only in a portion overlapping with a transmission request (RTS) from the corresponding third transmission device, information transmission in other portions can be rescued.

Further, the wireless transmission apparatus of the present invention is a wireless transmission apparatus serving as a control station of a network when a network is formed using a plurality of transmission apparatuses to transmit information. Receiving means for receiving a transmission request (RTS) signal of the same, and a corresponding transmission request (RTS)
Transmission permission transmitting means for transmitting a transmission permission (GTS) signal corresponding to the signal, detection means for detecting that information transmission from any transmission device has been completed, and detecting when information transmission has been completed. And a release notification transmitting means for transmitting a release notification (OTS) signal over the network.
As a control station of the network, receives an information transmission request (RTS) signal from a transmission device in the network, transmits a transmission permission (GTS) signal for the signal, and detects that information transmission of the transmission device is completed. Then, by transmitting the release notice (OTS) signal, it is possible to realize a transmission device that performs appropriate access control.

Further, the radio transmission apparatus of the present invention comprises a network using a plurality of transmission apparatuses, and a transmission request transmitting means for transmitting an information transmission request (RTS) signal in the radio transmission apparatus for transmitting information. , The corresponding transmission request (R
(TS) signal, and a transmission permission receiving means for receiving a transmission permission (GTS) signal corresponding to the signal, and an information transmission starting means for starting information transmission based on the transmission permission signal. Send a signal and allow transmission (GT
S) By receiving the signal, it is possible to realize a transmission device that performs access control for starting information transmission.

Further, the radio transmission apparatus of the present invention forms a network using a plurality of transmission apparatuses, and in a radio transmission apparatus for transmitting information, an information transmission request (RTS) signal or a corresponding transmission request (RTS) signal is transmitted. A transmission request or transmission permission receiving means for receiving a transmission permission (GTS) signal corresponding to the signal, a release notification receiving means for receiving an open notification (OTS) signal when information transmission on the network is completed, and a transmission request. A transmission standby unit that does not transmit information when a signal or a transmission permission (GTS) signal is received until the release notification (OTS) signal is received. By receiving an information transmission request (RTS) signal, a transmission permission (GTS) signal, and a release notification (OTS) signal,
It is possible to realize a transmission device that can grasp information transmission of a transmission device of a hidden terminal station that cannot directly communicate,
A transmission control based on a predetermined access control can be performed. This makes it possible to construct a network system using a plurality of transmission devices that cannot simultaneously perform a transmission operation and a reception operation (cannot detect collisions themselves). This provides an effect that suitable access control can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a wireless network configuration to which a wireless transmission method according to an embodiment is applied.

FIG. 2 is a diagram schematically showing a network connection mode.

FIG. 3 is a diagram illustrating a configuration example of a wireless transmission device configuring each communication station.

4A and 4B are diagrams showing an example of a sequence transition of access control. FIG. 4A is a transmission path utilization state, FIG. 4B is a transmission station transmission apparatus, FIG. 4C is a control station transmission apparatus, FIG. 4D is a reception station transmission apparatus, and FIG. Is a hidden terminal station device.

FIG. 5 is a flowchart illustrating an operation of information transmission in a transmission device of a transmitting station.

FIG. 6 is a flowchart of an operation of access control in a transmission device serving as a control station.

FIG. 7 is a flowchart of a receiving operation in a general transmission device serving as a receiving station and a hidden terminal station.

FIG. 8 is a diagram illustrating a configuration example of transmission request (RTS) information.

FIG. 9 is a diagram illustrating a configuration example of transmission permission (GTS) information.

FIG. 10 is a diagram illustrating a configuration example of release notification (OTS) information.

FIG. 11 is a diagram illustrating a configuration example of a wireless transmission frame according to a conventional method.

[Explanation of symbols]

11, 12, 13, 14 ... wireless transmission device, 15 ... network, 31 ... antenna, 32 ... wireless transmission / reception processing unit, 33 ... transmission control processing unit, 34 ... information conversion processing unit, 35 ... External interface unit, 36 Control unit, 37 Internal memory, 38 Serial bus, 3
9: Devices to be connected, 40, 44, 48, 52, 59
…… TRS, 41, 45, 49, 53, 56… GT
S, 42, 46, 50, 54 ... Data, 43, 4
7, 51, 55, 58 ... OTS, 57 ... Information transmission standby section

Claims (7)

[Claims] 1. A wireless transmission method for configuring a network using a plurality of transmission devices and transmitting information, comprising: transmitting an information transmission request (RTS) signal from an arbitrary transmission device to a control station of the network; A wireless transmission method characterized by starting information transmission from any of the transmission devices after waiting for a return of a transmission permission (GTS) signal corresponding to a corresponding transmission request (RTS) signal from the control station. 2. The wireless transmission method according to claim 1, wherein said control station of said network receives a transmission request (RTS) signal from said arbitrary transmission device on said network, and said transmission path is in an idle state. If so, a transmission permission (GTS) signal is returned. 3. The wireless transmission method according to claim 1, wherein the control station of the network sends an open notification (OTS) signal when information transmission from the arbitrary transmission device on the network is completed. A wireless transmission method characterized by transmitting over a network. 4. The wireless transmission method according to claim 3, wherein when an arbitrary transmission device receives a transmission permission (GTS) signal for another transmission device from the control station, the arbitrary transmission device thereafter transmits the release notification (OTS) signal. A wireless transmission method, wherein information transmission is waited until the information is received. 5. A wireless transmission device serving as a control station of a network when a network is formed by using a plurality of transmission devices to transmit information, wherein an information transmission request (RTS) signal from an arbitrary transmission device is provided. Receiving means for receiving a transmission request (RTS) signal corresponding to the corresponding transmission request (RTS) signal; transmission permission transmitting means for transmitting a transmission permission (GTS) signal corresponding to the transmission request (RTS) signal; And a release notification transmitting means for transmitting a release notification (OTS) signal to the network when the completion of the information transmission is detected. 6. A wireless transmission device for configuring a network using a plurality of transmission devices and transmitting information, a transmission request transmission means for transmitting an information transmission request (RTS) signal, and a corresponding transmission request (RTS) A wireless transmission device comprising: a transmission permission receiving unit that receives a transmission permission (GTS) signal corresponding to a signal; and an information transmission starting unit that starts information transmission based on the transmission permission signal. 7. A wireless transmission device for forming a network using a plurality of transmission devices and transmitting information, wherein a transmission permission (RTS) signal corresponding to an information transmission request (RTS) signal or a corresponding transmission request (RTS) signal is transmitted. A transmission request or transmission permission receiving means for receiving a GTS signal; a release notification receiving means for receiving an open notification (OTS) signal when the information transmission on the network is completed; A) a transmission standby unit that does not perform information transmission after receiving a signal until the release notification (OTS) signal is received.