JP2002026926A - Wireless transmission method and wireless transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless transmission method by which a transmission rate (modulation method and convolution coding rate) used for communication can be specified between wireless transmitters and to provide the wireless transmitter. SOLUTION: In this wireless transmission method, in the case of building up a wireless network by utilizing the wireless transmitters (#1-#7), they exchange prescribed packets (QRS-1, 2, 3) and (RRS-1, 2, 4, 5) to select a communication method utilized for the communication with the respective transmitters (#1, #2, #4-#7), then the transmission rate (modulation system, coding rate) is set according to rate setting (SRS) sent from a request station (#3) so as to decide a communication method used for communication and a method for conducting efficient communication can be obtained with a concerned transmitter.

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 In recent years, in order to transmit various digital information, a wireless transmission method for transmitting information using a high-speed serial bus specified in the IEEE 1394-1995 format has become popular.

Recently, a method of wirelessly transmitting information flowing through a high-speed serial bus specified in the IEEE 1394-1995 format has been considered as the wireless 1394 format.

A basic format of the wireless 1394 format has been unified, and a method of performing time-division multiplexing transmission of asynchronous (Asynchronous) transmission and isochronous (Isochronous) transmission, and a transmission apparatus (communication station) The outline of the management method, etc. was summarized.

[0005] This wireless 1394 format specifies that different modulation methods and convolutional coding rates can be used for transmission between radio transmission apparatuses (stations) as necessary.

Therefore, even when isochronous transmission, which is band reservation transmission, is performed, the reserved band changes depending on the modulation method and convolutional coding rate required for transmission.

[0007] Also, in the case of performing asynchronous (isochronous) transmission, an asynchronous transmission packet is added to a payload portion other than a PHY (physical) header added to the head of all packets by an arbitrary modulation method or convolutional coding rate. Is to be built.

[0008]

In the wireless 1394 format compiled up to now, the transmission rates (modulation method, convolutional coding rate) used for communication between the respective wireless transmission devices are respectively in the implementation stage. Because of the problem, there was a disadvantage that it was not possible to uniquely determine only the part targeted by standardization.

[0009] Further, a method of determining an available transmission rate from information on the received field strength of a station sync packet exchanged between each wireless transmission device (communication station) in the management area is assumed. However, the modulation method and the optimal convolutional coding that can be used for asynchronous transmission or isochronous transmission are obtained from only the received field strength information of one transmission rate (BPSK · R = １ ／) used in the management area. There was a disadvantage that it was impossible to specify the rate.

[0010] In addition, the station sync packet (SS
Since P) is exchanged every predetermined SSP cycle, for example,
When it is assumed that the transmission rate information is exchanged using the packet, there is a disadvantage that complicated packet exchange is performed even when the information transmission is not performed.

In addition, in asynchronous transmission, it is not possible to determine whether data should be transmitted at the transmission rate. For this reason, information transmission is performed at the highest transmission rate. Lowers the transmission rate and performs retransmission.
Back) A method of performing control has been considered,
In this case, there is an inconvenience that it takes time for the information to reach the destination transmission device correctly.

A transmission rate (modulation method, convolutional coding rate) usable for communication between these wireless transmission devices.
If the transmission rate cannot be specified, the transmission rate used for the data packet of asynchronous transmission cannot be determined.

Therefore, by repeating the asynchronous transmission,
Although a method of estimating the optimal transmission rate statistically is conceivable, if the optimal transmission rate was determined after asynchronous transmission started, the transmission rate used for asynchronous transmission was specified first. There was an inconvenience of not being able to do so.

Further, in order to perform isochronous (isochronous) transmission, it is necessary to reserve a band required for transmission in advance. If the rate (modulation method, convolutional coding rate) cannot be specified, the band required for reserved transmission cannot be estimated.

In view of the above, the present invention has been made in view of the above point, and a wireless transmission capable of specifying a transmission rate (modulation method, convolutional coding rate) used for communication between wireless transmission devices. It is an object to provide a method and a wireless transmission device.

[0016]

The radio transmission method according to the present invention, when a radio transmission device newly enters (association operation), exchanges a specific rate set packet (a packet) with each existing radio transmission device. Rate Set Pac
By exchanging “ket”, the transmission rate (modulation method, convolutional coding rate) required for communication with those existing wireless transmission devices is estimated.

That is, when a wireless transmission device conforming to the wireless 1394 newly enters a wireless network (association operation), a transmission rate (modulation method, convolutional coding rate) with each existing wireless transmission device is specified. In order to create a map to be used when the access control is performed, a predetermined access control (Hub Station (Hub Status)
n) in response to the polling from (Rolling Set).
exchange).

This rate set packet (Rate S)
et Packet), first, in a wireless transmission device requesting the exchange, a modulation method,
A plurality of rate set request packets (QRSs) having different convolutional coding rates are prepared, and broadcast transmission is performed from a packet having a high transmission rate on a network based on predetermined access control.

Then, the rate set request packet (QR
Since the wireless transmission device receiving S) can communicate with the wireless transmission device at the transmission rate initially received, it constructs a rate set repetition packet (RRS) including its contents (transmission rate information). Then, it is returned based on a predetermined access control.

Further, in the wireless transmission device that issued the request,
After a certain period of time (all repetition packets may be received), the transmission rate information determined with each wireless transmission device is converted into a rate set setting packet (SRS).
And broadcast transmission is again performed on the network.

At this time, the broadcast transmission may be performed at the lowest transmission rate.

Also, by exchanging a specific rate set packet (Rate Set Packet) at an arbitrary timing as necessary, for example, when the network configuration is changed, transmission necessary for communication with each wireless transmission device is performed. We propose a method for resetting the rate (modulation method, convolutional coding rate).

This rate set packet (Rate S)
et Packets are exchanged in advance to specify the optimum transmission rate (modulation method, convolutional coding rate) used for asynchronous transmission between the wireless transmission devices.

By exchanging the Rate Set Packet at an arbitrary timing such as when the configuration of the network is partially changed, the optimum transmission rate (modulation) used for asynchronous transmission is always changed. We propose a method for resetting the method and convolutional coding rate).

Further, when fallback transmission is performed, the rate set packet (Rate Set Packet) is exchanged as a trigger for recovery, thereby enabling an optimal transmission rate (modulation) between the radio transmission apparatuses. Method, a method of performing processing to return to convolutional coding rate).

This rate set packet (Rate S)
et Packets are exchanged in advance, so that a band (Isochronous Slot) for performing isochronous transmission between arbitrary wireless transmission devices can be obtained.
t) Used to calculate the required bandwidth when making a reservation.

By referring to the rate set packet thus exchanged, a method for setting an optimum transmission rate (modulation method, convolutional coding rate) used for asynchronous transmission is proposed.

By referring to the rate set packet thus exchanged, a method of calculating a bandwidth required for reservation at the time of isochronous transmission is proposed.

Further, in order to specify the transmission rate (modulation method, convolutional coding rate) between other wireless transmission devices,
A wireless transmission device having a function of exchanging these predetermined packets will be proposed.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION
A network is configured with a plurality of wireless transmission devices, and using packets of different transmission rates (modulation method and coding rate),
When asynchronous transmission or band reservation transmission is performed, predetermined packets are exchanged at an arbitrary timing, and the highest transmission rate that can be used between the wireless transmission devices is determined.

The 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 is connected to a wireless transmission device 11 via a cable or the like.
The printer output device 2 is connected by wire. Similarly, a VTR is connected to the wireless transmission device 12 via a cable or the like.
(Video tape recorder) 3 is connected by wire. Also,
Similarly, the camera-integrated VTR 4 is connected to the wireless transmission device 13 via a cable or the like. The game device 5 is similarly connected to the wireless transmission device 14 via a cable or the like. The set-top box 6 is similarly connected to the wireless transmission device 15 via a cable or the like. The television receiver 7 is similarly connected to the wireless transmission device 16 via a cable or the like by wire. Similarly, the telephone device 8 is connected to the wireless transmission device 17 via a cable or the like. In this way, each device is connected to each wireless transmission device, and each wireless transmission device constitutes the network 10.

Here, a wireless network 10 is formed corresponding to the wireless transmission devices 11 to 17 corresponding to the communication stations # 1 to # 7, respectively.

The radio transmission device 14, which is located at the center of the network 10 and can communicate with all the other radio transmission devices, is a control station of the radio network 10 for convenience. It is configured to send a predetermined access control signal to another communication station and manage band reservation information by defining a cycle.

FIG. 2 shows a configuration example of the radio transmission devices 11 to 17 constituting each communication station. Here, each of the wireless transmission devices 11 to 17 basically has a common configuration, and includes an antenna 21 that performs transmission and reception, and a wireless transmission and reception processing unit 22 that is connected to the antenna 21 and performs wireless transmission processing and wireless reception processing. Is provided so that wireless transmission with another wireless transmission device is possible.

In this case, as a transmission method in which transmission and reception are performed by the wireless transmission / reception processing unit 22 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.

A data conversion unit 23 performs data conversion of a signal received by the radio transmission / reception processing unit 22 and data conversion of a signal transmitted by the radio transmission / reception processing unit 22.

The data converted by the data conversion unit 23 is supplied to the connected device 28 via the interface unit 24, and the data supplied from the connected device 28 is supplied via the interface unit 24. The configuration is such that the data can be supplied to the data conversion unit 23 and converted.

Here, as an external interface of the interface unit 24 of the wireless transmission device, for example, IE
High-speed serial bus 2 such as EE1394 format
7, audio / video information or various data information can be transmitted / received to / from a connected device 28.

Alternatively, these wireless transmission devices may be built in the main body of the device 28 to be connected.

Each unit in each wireless transmission device is configured to execute processing based on the control of the control unit 25 constituted by a microcomputer or the like.

In this case, when the signal received by the wireless transmission / reception processing unit 22 of each wireless transmission device is a signal in the management area, the received signal is supplied to the control unit 25 via the data conversion unit 23. The control unit 25 sets each unit to the state indicated by the received information.

Further, the control unit 25 has an internal memory 26.
Is connected, and its internal memory 26 is configured to temporarily store data required for communication control, information on how to use the network, such as the number of communication stations and the number of reserved bands, and the like.

Further, in the radio transmission apparatus serving as the control station 14 of the network, the control section 25 sends a cycle start (C
S) The signal is supplied to the wireless transmission / reception processing unit 22 via the data conversion unit 23 and transmitted wirelessly.

In the transmission devices 11 to 13 and 15 to 17 other than the control station of the network, when the received signal is a cycle start (CS) signal, the received signal is transmitted through the data converter 23. The control unit 25 determines the timing of receiving the synchronization signal, sets a frame period based on the synchronization signal, and executes communication control processing in the frame period. is there.

For transmission of a packet related to the rate set according to the present embodiment, the control unit 25 constructs a packet as needed, and is supplied to the radio transmission processing unit 22 via the data conversion unit 23. Radio transmission is performed according to a predetermined access control (for example, in response to a polling signal addressed to the own station).

The signal received by the wireless transmission / reception processing unit 22 is
If the packet is a rate-set-related packet, the received signal is supplied to the control unit 25 via the data conversion unit 23, and the control unit 25 performs, as necessary, based on the received information. The transmission rate (modulation method and coding rate) used for communication with each communication station is determined and recorded in the internal memory 26.

FIG. 3 is a diagram showing a configuration example of a wireless transmission frame according to the present embodiment. Here, a frame is defined and shown for convenience, but it is not always necessary to adopt such a frame structure. In the figure, in the wireless transmission path 30, a transmission frame arriving at a constant transmission frame period 31 is defined, and a management information transmission area 32 and an information transmission area 33 are provided therein.

At the beginning of this frame, a downlink management information transmission section 34 (cycle start (CS: Cycle Sta.)) For frame synchronization and notification of network common information is provided.
rt)) section is arranged, followed by the time information correction transmission section 35 (cycle report (CR:
Cycle Report), and a station synchronization signal transmission / reception section 36 (station sync (SS: S
station Sync)).

The downlink management information transmission section (CS) is used for transmitting information that needs to be shared by the network from the control station, and is composed of a fixed length area and a variable length area.

In the fixed length area, in order to specify the length of the variable length area, the number of communication stations transmitted in the station synchronization signal transmission / reception section (SS) is specified, and the number of band reservation transmission areas (RSV) is specified. Designation is performed, and in the variable length area, a communication station to be transmitted in the station synchronous transmission / reception section (SS) and a bandwidth reservation transmission area (RSV) are specified.

The station synchronization signal transmission / reception section (SS) has a predetermined length, and the communication station transmitting the communication station has a certain period according to the downlink management information for each communication station constituting the network. A configuration that can be assigned by using this is considered.

For example, the station synchronization signal transmission / reception section (SS)
By receiving everything except the transmission part of the own station,
It is possible to grasp the state of a connection link with a communication station existing around the own station.

Further, the next station is in the station synchronous transmission / reception section (S
By reporting the connection link status in the information transmitted in S), the network connection status can be determined by each communication station.
There is a configuration that allows each to be grasped.

The information transmission area 33 is a bandwidth reservation transmission area (RSV: Reserve) 37 set as needed.
A centrally managed asynchronous transmission area (ASY: Asynchronous) 38 in which the control station performs transmission control, and an unused area (NUA:
Not Using Area) 39.

That is, the bandwidth reservation transmission (RSV) 37,
If there is no need for the unused area (NUA) 39, all of the information transmission area 33 is centrally managed as an asynchronous transmission area (AS).
Y) 38.

By adopting such a frame structure, in the band reservation transmission area (RSV) 37, for example, the IE
Isochronous transmission defined by the EE1394 format is performed, and in an asynchronous transmission area (ASY) 38, an asynchronous (Async) signal is transmitted.
It is preferable to adopt a configuration capable of performing, for example, (hronous) transmission.

FIG. 4 shows an example of the configuration of a rate set packet exchange sequence. Here, for convenience, a high-speed transmission rate (64 QAM · R = １ ／), an intermediate transmission rate (16 QAM · R = １ ／), and a low-speed transmission rate (QP
(SK · R = １ ／) are described, and a configuration example of a method of estimating a transmission rate is described.

In addition to the above, as a modulation method, a more reliable transmission rate: BPSK or an encoding rate of R
= 3/4, R = 7/8, etc.

When only a part of the once-set rate set is changed, a method of exchanging only packets of the transmission rate to be changed may be used.

First, a transmission device of a communication station that issues a rate setting request transmits a rate set request (QRS_1) at a high transmission rate (64 QAM · R = １ ／) according to a predetermined access control method.

This rate set request (QRS_1)
This indicates a state in which decoding cannot be performed correctly unless the communication station is located nearby (communication station # 2, communication station # 4).

Further, according to a predetermined access control method, a rate set request (QRS_2) is transmitted at an intermediate transmission rate (16 QAM · R =＝).

This rate set request (QRS_2) is
Peripheral communication stations (communication station # 2, communication station # 4, communication station # 5)
Otherwise, it cannot be decoded correctly.

Then, a rate set request (QRS_3) is transmitted at a low transmission rate (QPSK · R = １ ／) according to a predetermined access control method.

This rate set request (QRS_3)
Nearby communication stations (communication station # 1, communication station # 2, communication station # 4,
This indicates a state where decoding cannot be correctly performed unless the communication station is # 5).

The transmission device of the communication station that has received the rate setting request returns a rate set repetition (RRS) describing a transmission rate at which communication with the communication station that transmitted the request is possible.

This rate set repetition (RRS) is returned at a communicable transmission rate according to a predetermined access control method.

In communication station # 4, a rate set request (QR
S_1) could be received, so the high transmission rate (64Q
AM · R = 1/2) and rate set repetition (RRS_4)
Is returned according to a predetermined access control method.

In communication station # 5, a rate set request (QR
S_2) could be received, so the intermediate transmission rate (16Q
AM · R = 1/2) and rate set repetition (RRS_5)
Is returned according to a predetermined access control method.

Since the communication station # 6 and the communication station # 7 cannot receive the rate set request (QRS), the rate set repetition (RRS) is not returned.

In communication station # 1, a rate set request (QR
S_3), a low transmission rate (QPS
KR = 1/2) and rate set repetition (RRS_1)
Is returned according to a predetermined access control method.

In communication station # 2, the rate set request (QR
S_1) could be received, so the high transmission rate (64Q
AM · R = 1/2) and rate set repetition (RRS_2)
Is returned according to a predetermined access control method.

Alternatively, the rate set repetition (RRS_
In order to surely perform the return of n), a configuration may be employed in which the return is performed using a highly reliable transmission rate (BPSK · R = １ ／).

In the transmission device of the communication station which has issued the rate setting request, when the collection of the rate set repetition (RRS_n) is completed, the information on the transmission rate at which communication with each communication station is possible is described, and the rate is described. The set setting (SRS) is broadcast transmitted on the network.

The rate set setting (SRS) uses a highly reliable transmission rate (BPSK · R = １ ／) and is transmitted according to a predetermined access control method. Thereafter, in the asynchronous transmission to each communication station, the transmission rate (modulation method / coding rate) of the data payload portion of the packet is set according to the contents described in the rate set setting (SRS), and the packet is wirelessly transmitted. .

Further, at the time of band reservation for each communication station,
According to the contents described in the rate set setting (SRS), the transmission rate (modulation method / coding rate) of the data payload portion of the packet is determined, and the transmission band required for this transmission is reserved.

FIG. 5A is a diagram showing the contents of the rate set information transmitted as a rate set request packet (QRS) from the communication station (# 3) issuing the rate set request.

Note that this rate set information is described in all rate set request packets transmitted at different transmission rates.

Here, other communication stations (# 1 to # 2, # 4
Since it is not possible to determine the transmission rate to be used between the transmission devices # 1 to # 7), all communication stations are described as being unable to communicate (NC).

FIG. 5B is a diagram showing the contents of the rate set information transmitted as a rate set request packet (QRS) from the communication station (# 3) issuing the rate set request.

Note that this rate set information is described in all rate set request packets transmitted at different transmission rates.

Here, information of the management area (for example, station sync packet) is exchanged before exchange of the rate set information, and some communication stations (# 1, # 2, # 4, # 4) are exchanged based on the information. 5, # 6) indicates a state in which a transmission rate that can be transmitted to the transmission device is set (as the same transmission rate as the station sync packet).

It is not possible to communicate with communication station # 7 because a station sync packet cannot be received (NC).
Is shown.

FIG. 6A shows a rate set repetition packet (RRS) from the communication station (# 1) that has received the rate set request.
FIG. 9 is a diagram showing the content of rate set information returned as "."

Communication station # 1 has conventionally used 16QAM · R = １ ／ for communication with communication station # 2 and BPSK · R = に は for communication with communication station # 4. And communication station #
5 that communication with communication station # 7 is impossible (NC), and that communication with communication station # 3 can be newly performed at a transmission rate of QPSK · R = １ ／. Represents.

FIG. 6B shows a rate set repetition packet (RRS) from the communication station (# 2) that has received the rate set request.
FIG. 9 is a diagram showing the content of rate set information returned as "."

Communication station # 2 has conventionally been communication station # 1
And 16 QAM R = 1/2 for communication with communication station # 4.
BPSK · R = １ ／ is used for communication with the communication station # 5, and communication between the communication station # 6 and the communication station # 7 is impossible (NC). 6 for communication with # 3
This indicates that communication at a transmission rate of 4QAM · R = １ ／ is possible.

FIG. 6C shows a rate set repetition packet (RRS) from the communication station (# 4) that has received the rate set request.
FIG. 9 is a diagram showing the content of rate set information returned as "."

The communication station # 4 has conventionally been the communication station # 1.
And communication with communication station # 7, BPSK · R = １ ／
Is used for communication with communication station # 6, and QPSK · R = １ ／ is used for communication with communication station # 2, and 16QAM · R = 1 is used for communication with communication station # 2.
/ 2 for communication with communication station # 5, 64QAM · R = 1
/ 2 is used to newly communicate with the communication station # 3.
It indicates that communication at a transmission rate of QAM · R = １ ／ is possible.

FIG. 6D shows a rate set repetition packet (RRS) from the communication station (# 5) that has received the rate set request.
FIG. 9 is a diagram showing the content of rate set information returned as "."

Communication station # 5 has conventionally been communication station # 2
And communication with communication station # 7, BPSK · R = １ ／
For communication with the communication station # 6, 16QAM · R = １ ／
And 64QAM · R =
Communication with communication station # 1 is not possible using 1/2 (NC)
A new communication with the communication station # 3 includes 16QAM
-It indicates that communication at a transmission rate of R = 1/2 is possible.

FIG. 7 is a diagram showing the contents of the rate set information returned as a rate set setting packet (SRS) from the communication station (# 3) which has issued the request when the rate set repetition is completed.

That is, QPSK is exchanged with communication station # 1.
-Using R = 1/2, 64Q between communication station # 2
Using AM · R = 利用, 6
Use 4QAM · R = １ ／, use 16QAM · R = １ ／ with communication station # 5, and use BPSK · R = １ ／ with communication station # 6. , Communication with the communication station # 7 is impossible (NC).

FIG. 8 is a flowchart of the rate set setting request operation. First, in step S1, it is determined whether a rate set request operation is necessary. For example, at the time of a new transmission device (association operation) when a certain transmission device enters a wireless network, a transmission rate (a modulation method and a transmission method) that can be used for transmission with a transmission device of a communication station configuring the wireless network. When it is necessary to determine the information of the coding rate, a rate set setting request operation is required.

In step S1, if there is no need to make a rate set request, the process exits from the NO branch.

If a rate set request is made in step S1, the transmission rate for transmitting the request packet is determined in combination to confirm the rate set information in step S2 from the YES branch.

Further, in step S3, rate set request packets are constructed by the number corresponding to the above-mentioned combination.

Then, in step S4, it is determined whether to obtain the access control based on the predetermined access control.

If the access control right has been acquired in step S4, the flow shifts to step S5 to transmit a rate set request packet. If the access control right is not acquired in step S4, the determination in step S4 is repeated until the access control right is acquired.

Further, in step S6, it is determined whether or not all the packets have been transmitted. If all of the prepared request packets have been transmitted, in step S7, a rate determination timer is started. I do.

In step S6, if all the packets have not been transmitted, the process returns to step S4, and the transmission processing of the rate set request packet is performed again based on the predetermined access control.

FIG. 9 shows a flowchart of the rate set repetition operation. First, in step S11, it is determined whether a rate set request from a transmission device of another station has been received.

In step S11, if a rate set request has not been received, the process exits from the NO branch.

In step S11, if a rate set request has been received, the flow branches from step YES to step S12.
In, it is determined whether or not the first rate set request has been received.

In step S12, when a rate set request composed of the highest transmission rate at which reception is possible is received first, in step S13, transmission to and from the transmission device of the corresponding communication station is performed. Set the rate.

Further, in step S14, a rate set repetition packet is set. Then, step S15
In the above, it is determined based on a predetermined access control whether to acquire the access control right.

If the access control right has been acquired in step S15, the flow shifts to step S16 to transmit a rate set repetition packet. If the access control right is not acquired in step S15, the determination in step S15 is repeated until the access control right is acquired.

If a plurality of rate set requests are received in step S12, the process exits from the NO branch.

FIG. 10 shows a flowchart of the rate set setting operation. In step S21, it is determined whether or not a rate set repetition has been received from a transmission device of another station.

If the rate set repetition is received in step S21, the process branches to YES in step S2.
At 2, rate set information with the communication station is obtained.

Then, in step S23, it is determined whether or not the rate set repetition has been completed. In step S23, if the rate set repetition is completed, the process proceeds to step S25, and if not, the process proceeds to step S24. If the rate set repetition is not received in step S21, the process moves to step S24 from a NO branch.

In step S24, step S7 in FIG.
It is determined whether or not the rate determination timer set in the above has timed out.

If it is determined in step S24 that the rate determination timer has not timed out, step S2 is performed again.
Go to 1 and attempt to receive a rate set repetition from another communication station.

If the rate determination timer has timed out in step S24, the flow shifts to step S25 to set the transmission rate usable for communication with the own station from the rate set information of each station acquired up to that time. Stored in the internal memory of the transmission device.

Further, in step S26, a rate set setting packet is set. Then, step S27
In step (1), it is determined whether to acquire an access control right based on a predetermined access control.

If the access control right has been acquired in step S27, the flow shifts to step S28 to transmit a rate set setting packet.

In step S27, if the access control right is not obtained, the determination in step S27 is repeated until the access control right is obtained.

FIG. 11 shows a flowchart of the rate set determination operation in each communication device. First, in step S31, it is determined whether or not a rate set setting has been received from the transmission device that issued the rate set request.

When the rate set setting is received, Y
In step S32 from the branch of the ES, transmission rate information with the own station is confirmed from the rate set information.

In step S33, the transmission rate is stored in an internal memory of the transmission apparatus as a transmission rate that can be used for communication with the transmission apparatus that issued the rate set request.

Although not shown here, if there is a problem with the transmission rate available for communication set with the transmission device of the communication station that issued the request,
If necessary, a rate set request is transmitted from the communication station that detected the inconvenience, and the rate set packet is exchanged again to reset the highest transmission rate available for communication between the communication stations. There is a configuration that can be.

FIG. 12 is a flowchart showing the operation of transmitting asynchronous information using the rate set information. First, in step S41, it is determined whether a request for wireless transmission of asynchronous information has been received with respect to the interface of the transmission device of the own station.

If a request for wireless transmission of asynchronous information is received in step S41, the flow proceeds to step S42.
The transmission rate information of the asynchronous information with the receiving station is obtained, and the transmission rate of the asynchronous transmission packet is set in step S43. In step S44, fragment processing is performed in predetermined fragment units as needed.
In step S45, an asynchronous transmission packet is constructed.

Then, in step S46, it is determined whether to acquire the access control right based on the predetermined access control.

If the access control right has been acquired in step S46, the flow shifts to step S47 to transmit an asynchronous transmission packet.

If it is determined in step S46 that the access control right is not obtained, the determination in step S46 is repeated until the access control right is obtained.

Further, in step S48, it is determined whether or not all the packets have been transmitted. If all the packets have not been transmitted, the process returns to step S46.
Again, transmission processing of the asynchronous transmission packet is performed based on the predetermined access control.

When all of the prepared asynchronous transmission packets have been transmitted, a series of asynchronous information transmission processing ends.

FIG. 13 shows a flowchart of the band reservation operation using the rate set information. First, step S
At 51, it is determined whether a request for bandwidth reservation has been accepted for the interface of the transmission apparatus of the own station.

In step S51, when a request for band reservation is received, in step S52, transmission rate information with the receiving station of the band reservation transmission is acquired, and in step S53, the transmission rate information is required for band reservation transmission. In step S54, a bandwidth reservation packet for bandwidth reservation is constructed.

Then, in step S55, it is determined whether to acquire the access control right based on the predetermined access control.

If the access control right has been acquired in step S55, the flow shifts to step S56 to transmit a band reservation packet to the control station.

If the access control right is not obtained in step S55, the determination in step S55 is repeated until the access control right is obtained.

Thereafter, the band reservation is accepted by the control station, and the band reservation transmission is started according to the instruction of the control station.

Although the above-described embodiment has been described with reference to an example applied to the wireless 1394, it is needless to say that the present invention is not limited to this and can be applied to other wireless networks.

[0138]

According to the wireless transmission method of the present invention, when a wireless network is constructed using a plurality of wireless transmission devices, a communication method used for communication with each of the transmission devices is selected. By exchanging predetermined packets,
It is possible to determine the communication method used for communication,
There is an effect that a method of performing efficient communication with the corresponding transmission device can be obtained.

Further, according to the wireless transmission method of the present invention, when a wireless network is constructed using a plurality of wireless transmission devices, a communication method used for communication with each of the transmission devices is selected. By exchanging predetermined packets, it is possible to estimate the amount of transmission band required for reserved bandwidth transmission, and it is possible to obtain a method of performing minimum required bandwidth reservation transmission.

Further, according to the radio transmission method of the present invention, as a communication method used for communication, packets having different modulation methods and convolutional coding rates are prepared.
There is an effect that a modulation method and a method for estimating a convolutional coding rate, which are optimal for communication of each transmission device, can be obtained.

Further, according to the radio transmission method of the present invention, it is possible to eliminate the necessity of inadvertently exchanging packets by exchanging predetermined packets when entering a radio network. This has the effect.

Further, according to the radio transmission method of the present invention, predetermined packets are exchanged at an arbitrary timing as necessary, so that the packets are used for communication when the network configuration changes. There is an effect that the communication method can be reset.

Further, according to the radio transmission method of the present invention, by exchanging a predetermined packet based on a predetermined access control method, other packets can be transmitted without hindering other information transmission.
There is an effect that packets can be exchanged.

Further, according to the wireless transmission apparatus of the present invention, a predetermined packet is exchanged as a wireless transmission apparatus that constructs a wireless network by using a plurality of wireless transmission apparatuses. An advantage is provided in that a communication method used for communication with each transmission device is stored, and a wireless transmission device capable of setting the communication method for communication with the corresponding transmission device can be realized.

Further, according to the wireless transmission device of the present invention, a predetermined packet is exchanged as a wireless transmission device that constructs a wireless network by using a plurality of wireless transmission devices. An effect that a communication method used for communication with each transmission device is stored and a wireless transmission device capable of estimating the amount of transmission band required for band reservation communication with each transmission device can be realized. To play.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating a configuration example of a wireless transmission device configuring each communication station.

FIG. 3 is a diagram illustrating a configuration example of a wireless transmission frame.

FIG. 4 is a diagram illustrating a configuration example of an exchange sequence of a rate set packet.

5A and 5B are diagrams illustrating a configuration example of request rate set information. FIG. 5A is a configuration example of a communication station 3, and FIG. 5B is a configuration example of another communication station 3.

6 is a diagram showing a configuration example of repetition rate set information. FIG. 6A is a configuration example of a communication station 1, FIG. 6B is a communication station 2, FIG. 6C is a communication station 4, and FIG.

FIG. 7 is a diagram illustrating a configuration example of set rate set information (communication station 3).

FIG. 8 is a flowchart showing a rate set request operation.

FIG. 9 is a flowchart showing a rate set repetition operation.

FIG. 10 is a flowchart showing a rate set setting operation.

FIG. 11 is a flowchart illustrating a rate set determination operation.

FIG. 12 is a flowchart showing an operation of asynchronous transmission.

FIG. 13 is a flowchart showing the operation of bandwidth reservation.

[Explanation of symbols]

11, 12, 13, 14, 15, 16, 17 ... wireless transmission device, 10 ... wireless network, 21 ... antenna, 22 ... wireless transmission / reception processing unit, 23 ... data conversion unit, 24 ... external interface Unit, 25 control unit, 26 internal memory, 27 serial bus, 2
8: Connected device, QRS: Rate set request,
RRS: Rate set repetition, SRS: Rate set setting

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04L 29/08 H04L 13/00 305C H04N 7/173 620 307C (72) Inventor Satoshi Konya 6-chome Kita Shinagawa, Shinagawa-ku, Tokyo No. 7-35 Sony Corporation F term (reference) 5C064 BA07 BB05 BC10 BC16 BC23 BC25 BD02 BD08 BD09 BD14 5K014 AA01 BA10 DA02 EA01 FA12 5K033 AA01 BA01 BA15 CB01 CB04 CC01 DA01 DA19 DB09 DB10 DB12 DB16 EC01 5K034 AA01 A01 DD03 EE03 HH04 HH07 HH09 HH14 HH16 HH63 KK21 LL01 MM01 MM08 NN12 NN22 5K067 AA13 AA33 BB21 CC08 DD51 EE02 EE10 HH23 JJ11

Claims (10)

[Claims] 1. A wireless transmission method in which a wireless network is constructed using a plurality of wireless transmission devices and a communication method used for communication with each wireless transmission device can be selected. A wireless transmission method characterized by exchanging a packet and selecting a communication method used for communication between the wireless transmission devices. 2. The wireless transmission method according to claim 1, wherein each of the predetermined packets is obtained by exchanging a packet formed by a plurality of modulation methods and a convolutional coding rate in order from a high transmission rate. A wireless transmission method characterized by selecting an optimal communication method for communication with a wireless transmission device. 3. The wireless transmission method according to claim 1, wherein the exchange of the predetermined packet is based on a predetermined access control method when entering the wireless network.
A wireless transmission method characterized by being exchanged. 4. The wireless transmission method according to claim 1, wherein the exchange of the predetermined packets is performed at an arbitrary timing based on a predetermined access control. 5. A wireless transmission method in which a wireless network is constructed using a plurality of wireless transmission devices and a communication method used for communication with each wireless transmission device can be selected. A wireless transmission method comprising: estimating an amount of a transmission band required for band reservation transmission between wireless transmission devices by exchanging the packets. 6. The wireless transmission method according to claim 5, wherein each of the predetermined packets is obtained by exchanging a packet composed of a plurality of modulation methods and a convolutional coding rate in order from a high transmission rate. A wireless transmission method characterized by selecting an optimal communication method for communication with a wireless transmission device. 7. The wireless transmission method according to claim 5, wherein the exchange of the predetermined packet is based on a predetermined access control method when entering the wireless network.
A wireless transmission method characterized by being exchanged. 8. The wireless transmission method according to claim 5, wherein the predetermined packets are exchanged at an arbitrary timing based on a predetermined access control. 9. A packet for exchanging a predetermined packet in a wireless transmission device capable of constructing a wireless network using a plurality of wireless transmission devices and selecting a communication method used for communication with each of the wireless transmission devices. Exchange means, storage means for storing a communication method used for communication with each wireless transmission device from the exchanged predetermined packet, and communication for setting the communication method for communication with the corresponding wireless transmission device A wireless transmission device comprising: a method setting unit. 10. A wireless transmission device capable of constructing a wireless network using a plurality of wireless transmission devices and selecting a communication method used for communication with each of the wireless transmission devices. Switching means, estimating means for estimating the amount of transmission bandwidth required for bandwidth reservation communication with each wireless transmission device from the exchanged predetermined packets, and bandwidth reservation means for reserving the corresponding transmission bandwidth. A wireless transmission device comprising: