JP2001203767A - Radio transmitting method, radio transmitting device and radio reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio transmitting method for which an arbitrary modulation system and convolution encoding rate can be designated. SOLUTION: In the radio transmitting method for transmitting packetized data in a prescribed information unit, a packet is divided into a header information part and a data payload part and information is transmitted. The modulation system and the convolution encoding rate of the data payload part are designated for a specific bit of the reader information part and a radio packet is constituted. Then, packetized data is transmitted by using the radio packet.

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 apparatus, and a radio receiving apparatus.

[0002]

2. Description of the Related Art In recent years, information has been transmitted using a plurality of modulation schemes and convolutional coding rates. In this case, the receiving communication station must recognize what kind of modulation scheme or convolutional coding the information sent by the transmitting communication station has been transmitted.

[0003] Therefore, conventional information for enabling a destination communication station to recognize what kind of modulation scheme or convolutional coding the information sent by a source communication station has transmitted is used. Some of the transmission methods are described below.

[0004] In the first method, a negotiation operation is performed using a common modulation scheme and convolutional coding rate before information transmission, and thereafter, a modulation scheme and a convolutional coding rate used for transmission are determined.

[0005] The second method is a method using fallback control. In this method, first, information is transmitted using a high-speed modulation method and a high-speed convolutional coding rate. The information is retransmitted by sequentially lowering the modulation scheme and the convolutional coding rate.

In the third method, a modulation method and a convolutional coding rate used for information transmission are designated in advance using common preamble information and the like, and then asynchronous information transmission is performed.

In a fourth method, a header portion to be decoded first of information to be transmitted uses a common modulation scheme and a common convolutional coding rate, and uses a common payload and a common convolutional coding rate to generate length information and length information of a data payload portion. Transmission is performed by designating a modulation scheme and a convolutional coding rate used for information transmission.

[0008]

Now, when a plurality of combinations of modulation schemes and a plurality of convolutional coding rates are prepared and wireless transmission of asynchronous information is performed, the communication between the source communication station and the destination communication station is required. In between, it is necessary to notify each other in advance of information on the combination of the modulation scheme and the convolutional coding rate used for information transmission.

A first method of negotiating a modulation scheme and a convolutional coding rate used for information transmission using information of a common modulation scheme and a convolutional coding rate before transmitting information. In order to judge what kind of modulation scheme and convolutional code rate the currently transmitted information cannot be transmitted wirelessly immediately, However, a problem arises in that the information is required.

In the second method, information is initially transmitted using a high-speed modulation scheme or a high-speed convolutional coding rate, and every time transmission fails, the modulation scheme or the convolutional coding rate is reduced. Are sequentially reduced, and a method using fallback control for retransmitting information is adopted, transmission control is performed in units of asynchronous transmission packets having a large amount of information, so that retransmission is long. Since the transmission must be restarted from the beginning using the packet for asynchronous transmission, the efficiency is poor in wireless transmission in which the state of the transmission line changes frequently, and if a frame is defined at a fixed period (time), Since transmission beyond that frame cannot be performed,
There is a problem that the throughput is not improved.

[0011] The above-mentioned third method, which uses common preamble information and the like, specifies the length information of the data payload portion, the modulation method and the convolutional coding rate used for information transmission, and transmits the data. In the case where the above method is adopted, since a sufficient information bit string cannot be secured, there arises a problem that redundant information relating to transmission control or an error correction code cannot be added and transmitted.

In the fourth method, a common modulation method and a convolutional coding rate are used for the header part to be decoded first, and the length information of the data payload part and the modulation method and the convolution method used for information transmission are used. In the case of adopting the method of transmitting by specifying the coding rate, if the subsequent length (Length) information cannot be decoded from the header information, the length of the asynchronous information cannot be determined. In addition to this, there is a problem that the transmission path is occupied for a long time due to useless transmission.

In view of the above, the first aspect of the present invention is to propose a wireless transmission method capable of designating an arbitrary modulation method and a convolutional coding rate.

A second object of the present invention is to propose a wireless transmission method capable of performing information transmission using an arbitrary modulation method and a convolutional coding rate in a data payload portion of an asynchronous transmission packet.

A third object of the present invention is to propose a wireless transmission method capable of forming a wireless packet having a variable length depending on a modulation method and a convolutional coding rate.

A fourth object of the present invention is to propose a wireless transmission method capable of forming a fixed-length wireless packet without depending on a modulation method and a convolutional coding rate.

According to a fifth aspect of the present invention, packetized data is transmitted from a source communication station to a destination communication station in a predetermined information unit, and reception of the packet is confirmed by the destination communication station. It is an object of the present invention to propose a wireless transmission method that can surely return a reception confirmation in a wireless transmission method using a confirmation method for replying to a source communication station.

According to a sixth aspect of the present invention, there is provided a wireless transmission method for transmitting data from a source communication station to a destination communication station using data packetized in a predetermined information unit, and receiving a packet. An object of the present invention is to propose a wireless transmission method that can reliably retransmit packetized data when a confirmation method is used in which confirmation is returned from a receiving communication station to a transmitting communication station. .

According to a seventh aspect of the present invention, there is provided a wireless transmission method for transmitting data from a source communication station to a destination communication station using packetized data in a predetermined information unit. An object of the present invention is to propose a wireless transmission method that can reliably perform retransmission when a confirmation method is used in which confirmation is returned from a receiving communication station to a transmitting communication station.

An eighth aspect of the present invention is to propose a wireless transmission apparatus capable of performing wireless transmission by combining an arbitrary modulation method and a convolutional coding rate.

The ninth invention is based on the header information.
An object of the present invention is to propose a wireless receiving device capable of decoding a payload portion as asynchronous information.

[0022]

According to a first aspect of the present invention, in a wireless transmission method for transmitting packetized data in a predetermined information unit, a packet is divided into a header information portion and a data payload portion. Performs information transmission, configures a wireless packet by designating the modulation method and convolutional coding rate of the data payload part in specific bits of the header information part, and transmits the packetized data using the wireless packet. Wireless transmission method.

According to the first aspect of the present invention, a packet is divided into a header information portion and a data payload portion, and information is transmitted.
A wireless packet is configured by designating a modulation scheme and a convolutional coding rate of a data payload portion. Then, packetized data is transmitted using the wireless packet.

According to a second aspect of the present invention, in the first aspect,
The header information portion is a wireless transmission method using a predetermined modulation method and a convolutional coding rate specified on a transmission path without depending on the modulation method and the convolutional coding rate of the data payload portion.

According to a third aspect of the present invention, in the first aspect,
A data transmission portion is a wireless transmission method in which one packet is formed for a predetermined information unit to form a wireless packet having a variable length according to a modulation scheme and a convolutional coding rate.

According to a fourth aspect, in the first aspect,
A wireless transmission method for configuring a fixed-length radio packet without depending on a modulation scheme and a convolutional coding rate by configuring one packet as a fixed length for a plurality of information units for a data payload portion It is.

According to a fifth aspect of the present invention, packetized data is transmitted from a source communication station to a destination communication station in a predetermined information unit, and reception of the packet is confirmed by the destination communication station. In a wireless transmission method using a confirmation method that replies to a source communication station, for reception confirmation, a modulation method and a convolutional code that are more reliable than a modulation method and a convolutional code rate of a packetized data payload portion are used. This is a wireless transmission method in which a confirmation packet is constructed using an activation rate.

According to a sixth aspect of the present invention, there is provided a radio transmission method for transmitting packetized data in a predetermined information unit from a source communication station to a destination communication station. A packet is constructed separately from the payload part, and the reception confirmation of the packet is transmitted from the destination communication station to the source communication station using a confirmation method. Although the reception confirmation is received, a part of the packet is retransmitted. Is required, a wireless transmission method for constructing a retransmission packet in which the modulation scheme of the data payload portion of the packet and the convolutional coding rate are changed.

According to a seventh aspect of the present invention, there is provided a wireless transmission method for transmitting data from a source communication station to a destination communication station using packetized data in a predetermined information unit. And a data payload portion, construct a packet, and use a confirmation method in which the reception confirmation of the packet is returned from the destination communication station to the source communication station. This is a wireless transmission method for forming a retransmission packet by changing the modulation method and convolutional coding rate of the data payload portion of a packet when confirmation information cannot be received.

According to an eighth aspect of the present invention, for asynchronous transmission information,
Means for constructing a data payload in a predetermined information unit;
Means for adding predetermined header information with respect to the data payload, means for specifying the modulation scheme and convolutional coding rate of the data payload portion in the header information, means for adding a preamble to the data payload and header information, A wireless transmission device having an asynchronous transmission device in a wireless network system and performing wireless transmission according to a predetermined access control procedure.

According to a ninth aspect of the present invention, there is provided a means for receiving a predetermined preamble, a means for decoding header information added to the received predetermined preamble, and a method for decoding the header information based on the decoded header information. Means for specifying the modulation scheme and convolutional code rate of the payload portion following the
A wireless receiving device having an asynchronous transmission device in a wireless network system, comprising: means for decoding a payload portion as asynchronous information based on the specified modulation scheme and convolutional coding rate.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a radio transmission method and apparatus and a radio reception apparatus according to the present invention will be described below. That is, in the present invention, common header information is prepared using data packetized for each predetermined information unit (unit), and the modulation scheme of the data payload portion is included in the common header information. And information such as a convolutional coding rate and a predetermined preamble are added to form a packet to perform asynchronous transmission.

This common header information uses the modulation scheme and the convolutional coding rate common to the wireless network even when transmitting while changing the modulation scheme and the convolutional coding rate of the data payload (Data Payload) part. I do.

When the confirmation information is returned from the destination communication station to the source communication station when the packet is transmitted from the source communication station to the destination communication station, the data payload portion of the packet is transmitted. A packet of acknowledgment information is constructed and returned using the modulation scheme, the modulation scheme more reliable than the convolutional coding rate, and the convolutional coding rate.

Further, when the confirmation information is returned from the destination communication station to the source communication station when the packet is transmitted from the source communication station to the destination communication station, retransmission is necessary. A data payload portion is constructed in a predetermined information unit (unit), and retransmission is performed using a more reliable modulation scheme and a convolutional coding rate.

Further, when the confirmation information is not returned from the destination communication station to the source communication station when the packet is transmitted from the source communication station to the destination communication station, all information units are transmitted. (Unit) constructs a data payload portion and performs retransmission using a more reliable modulation scheme and convolutional coding rate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, an example of a wireless network system will be described with reference to FIG. WNT indicates a wireless network, which includes a wireless transmission device 104 as a control station and wireless transmission devices 101 to 101 as terminal communication stations.
103.

Here, the control station 104 communicates with the terminal communication station 10.
Direct communication between 1 and 103 is possible. Further, the terminal communication station 101 cannot perform direct communication with the distant communication station 103, but can perform direct communication with the control station 104 and the communication station 102. The terminal communication station 102 can directly communicate with the control station 104 and the terminal communication stations 101 and 103. The terminal communication station 103 cannot perform direct communication with the distant terminal communication station 101, but the control station 10
4 and direct communication between the terminal communication station 102 is possible.

For example, a personal computer 11 and a printer output device 12 are connected to the wireless transmission device 101 via a cable L1. Wireless transmission device 10
For example, a magnetic recording / reproducing device (VTR) 13 is connected to 2 via a cable L2. Wireless transmission device 1
03, for example, the telephone device 1 through the cable L3.
5 and the set-top box 14 are connected. For example, a television receiver 16 and a game device 17 are connected to the wireless transmission device 104 via a cable L4. Set-top boxes are used in repeaters and TV receivers that exchange signals between broadcasting stations and homes.
It is used as a home adapter or the like that connects an ATV line and controls many programs.

Next, an example of the configuration of a wireless transmission frame will be described with reference to FIG. 2, but the present invention is not limited to this.
In FIG. 2, a transmission frame that arrives at regular intervals is defined, and a management information transmission area and an information transmission area are provided therein. The horizontal axis represents time (t). At the beginning of this frame, a downlink management information transmission section DM for frame synchronization and notification of network common information is provided. If necessary, this downlink management information transmission section DM
Subsequently, a station synchronous transmission section UM is provided.

The station synchronous transmission section UM is assigned to each of the communication stations constituting the network, one by one, so that transmissions at a plurality of communication stations can be prevented from colliding. For example, by receiving all of the station synchronous transmission section UM except for the transmission part of the own station, it is possible to grasp the connection link state with the communication stations existing around the own station. Further, by reporting the status of the connection link in the information transmitted in the station synchronization section of the own station in the next frame, each communication station can grasp the connection status of the network.

The information transmission area is constituted by a band reservation transmission area set as needed and an asynchronous transmission area other than the above. That is, if there is no need for band reservation transmission, it is possible to transmit the entire information transmission area as an asynchronous transmission area. By adopting such a frame structure, in the band reservation transmission area, for example, the isochronous (I
It is preferable to adopt a configuration in which transmission is performed in an asynchronous transmission area in which asynchronous transmission or the like can be performed.

Next, an example of the configuration of the wireless transmission devices 101 to 104 in FIG. 1 will be described with reference to FIG. Here, the wireless transmission devices 101 to 104 basically have a common configuration. Reference numeral 21 denotes an antenna for performing transmission and reception. The antenna 21 is connected to first to fourth wireless processing units 22A to 22D for performing wireless transmission processing and wireless reception processing, and performs communication with another wireless transmission apparatus. The communication is performed. These first to fourth wireless processing units 2
As a transmission system in which transmission and reception are performed by 2A to 22D, for example, OFDM (Orthogonal Frequency D)
A transmission method using a multicarrier signal called an ivision Multiplex (orthogonal frequency division multiplexing) method can be applied. As a frequency used for transmission and reception, for example, a frequency in a very high frequency band (for example, a 5 GHz band) is used. used. Further, the transmission output in the case of this example is set to a relatively weak output. For example, when used indoors, the transmission output is several meters to several tens meters.
The output is such that wireless transmission can be performed over a relatively short distance.

Then, the first wireless processing unit 22A calculates the first combination of the modulation method and the convolutional coding rate as follows:
The modulation method is QPSK (Quadrature Phase Shift Keying:
4 phase shift keying), convolutional coding rate R is 1
/ 2, the wireless transmission apparatuses can perform transmission / reception processing using the modulation scheme and the convolutional coding rate R. In the second radio processing unit 22B, the modulation scheme is QP as the second combination of the modulation scheme and the convolutional coding rate.
SK, the convolutional coding rate R is 3/4, and the wireless transmission apparatuses can perform transmission / reception processing using the modulation scheme and the convolutional coding rate R. In the third wireless processing unit 22C, as a third combination of the modulation method and the convolutional coding rate, the modulation method is 16QAM (Quadrature Amplifier).
Itude modulation (quadrature amplitude modulation), the convolutional coding rate R is ２, and wireless transmission apparatuses can perform transmission and reception processing using this modulation method and the convolutional coding rate R. The fourth radio processing unit 22D uses the modulation method and the convolutional coding rate R as the fourth combination of the modulation method and the convolutional coding rate, the modulation method being 16QAM and the convolutional coding rate R being 3/4. Communication stations can perform transmission and reception processing. Each of the wireless processing units 22A to 22D is configured to select a combination to be used based on an instruction from the control unit 25 for each piece of information (packet) to be transmitted, and to perform a transmission / reception process. The communication is performed based on

The first to fourth wireless processing units 22A to 22A
A data conversion unit 23 is provided for performing data conversion of a signal received by 22D and data conversion of a signal transmitted by the first to fourth wireless processing units 22A to 22D. The data converted by the data converter 23 is transmitted to the interface 2
4, the data supplied from the connected device 28 is supplied to the data converter 23 via the interface 24, and the data can be converted. Here, as an external interface of the interface 24 of the wireless transmission device, for example, transmission and reception of audio and video information or various data information to a connected device 28 via a high-speed serial bus 27 such as IEEE1394 is performed. There is a configuration that can be performed. Note that these wireless transmission devices may be built in the main body of the device 28 to be connected.

Each unit in the wireless transmission device is configured to execute a process under the control of the control unit 25 composed of a microcomputer or the like. In this case, if the signal received by the second wireless processing unit 22B is a control signal such as wireless transmission band reservation information, the received signal is supplied to the control unit 25 via the data conversion unit 23. , And the control unit 25 sets each unit to a state indicated by the received control signal.

Further, an internal memory 26 is connected to the control unit 25. The internal memory 26 stores data necessary for communication control, information on the number of communication stations constituting a network, and information on how to use a transmission line. , Slot information reserved for bandwidth,
The configuration is such that information for designating a wireless processing unit to be used for each information transmission is temporarily stored.

When the received signal is a synchronization signal,
The control unit 25 detects the timing of receiving the synchronization signal, sets a frame period based on the synchronization signal,
The communication control process is executed in the frame cycle.

The control unit 25 transmits a control signal such as wireless transmission band reservation information to another transmission apparatus from the control unit 25 via the data conversion unit 23 to the second wireless transmission processing unit 22B. To be transmitted wirelessly.

FIGS. 4A to 4C and 5 show examples of radio transmission packets in which a header information portion (header data) and a data payload portion (data payload) are separated. In FIGS. 4A to 4C and 5, the header information portion and the data payload portion have different data lengths (Data Length).
In (h), the header information part is composed of a combination of a high-quality modulation method and a convolutional coding rate, and the data payload part is composed of a combination of a higher-speed modulation method and a convolutional coding rate. It indicates that it has been done. Also, the data payload portion is treated as fixed-length data in the upper layer, and at the time of performing wireless transmission processing, configures a transmission packet based on a combination of each modulation scheme and convolutional coding rate to perform wireless transmission. It is preferred to do so.

FIG. 4A shows an example in which the modulation scheme is QPSK and the coding rate R is １ ／ for both the header information part and the data payload part. FIG. 4B shows that the header information part is configured with the modulation scheme of QPSK and the coding rate R is 、,
This is an example in which SK and a coding rate R are configured as 3/4.
FIG. 4C shows an example in which the header information part is configured with the modulation scheme of QPSK and the coding rate R of 、, and the data payload part is configured with the modulation scheme of 16 QAM and the coding rate R of １ ／. is there. FIG. 5 shows an example in which the header information part is configured with a modulation scheme of QPSK and a coding rate R of 1/2, and the data payload part is configured with a modulation scheme of 16 QAM and a coding rate R of 3/4. is there. It is also possible to use a combination of a header information portion and a data payload portion other than those shown here. Here, T indicates the tail (Tail).

FIGS. 6, 7 and 8 show an example of constructing a radio transmission packet by dividing a header information portion and a data payload portion into data lengths (Data Length) by a combination of a modulation method and a convolutional coding rate. This shows a method of configuring a packet in which is variable.

FIG. 6 shows that the modulation scheme is QPSK and the coding rate R is 1 for both the header information portion and the data payload portion.
/ 2 is an example. FIG. 7 shows a configuration in which the header information portion is configured such that the modulation scheme is QPSK and the coding rate R is 、,
This is an example in which M and the coding rate R are configured as 1/2. FIG. 8 shows a case where the header information portion is configured such that the modulation scheme is QPSK and the coding rate R is 、, and the data payload portion is
This is an example in which the modulation scheme is 16QAM and the coding rate R is 3/4. It should be noted that a combination of a header information portion and a data payload other than those shown here can also be used.

FIG. 9 shows an example of information added to the header information portion. The packet ID indicates what type of packet, the modulation method / coding rate information of the data payload portion, and the source communication station. It is composed of information, destination communication station information, relay destination communication station information set as needed, a relay flag, a sequence number assigned to each packet, and the like. In addition to the above information, information may be additionally set as necessary. Further, the header information includes a header CRC (Cyclic Redundancy Check:
(Cyclic redundancy check).

FIG. 10 shows an example of transmission information added to the data payload portion, which is a fragment (Fra).
gment) is formed from the first bit information indicating the first packet and the last bit information indicating the last packet. In addition to the above information, information may be additionally set as necessary. Further, following this transmission information, a data payload of a predetermined length (here, in units of 64 bytes) is formed, and further a CRC for error detection is added.

FIG. 11 shows an example of setting information indicating a combination of each modulation scheme and convolutional coding rate. In the figure, an example is shown in which information XXX for three bits is allocated for this setting. 000 is a modulation scheme of QPSK, a convolutional coding rate R of 1/2, and a packet length of
(Packet Length) is identified as a combination of (Header) +12 symbols.

Reference numeral 001 indicates a combination in which the modulation scheme is QPSK, the convolutional coding rate R is 3/4, and the packet length is a header + 8 symbols. 010 indicates that the modulation method is 16
QAM indicates a combination in which the convolutional coding rate R is 、 and the packet length is header + 6 symbols. 0
No. 11 is identified as a combination in which the modulation scheme is 16QAM, the convolutional coding rate R is 3/4, and the packet length is a header + 4 symbols.

FIG. 11 shows an example in which a radio transmission packet in which a variable-length data payload is set is used. 100 is a combination in which the modulation scheme is QPSK and the convolutional coding rate R is １ ／, and the packet length is 1
It is recognized as a two-symbol fixed length. Reference numeral 101 denotes a combination in which the modulation scheme is 16 QAM and the convolutional coding rate R is １ ／, and the packet length is recognized as a fixed length of 12 symbols. Reference numeral 110 denotes a combination in which the modulation scheme is 16QAM and the convolutional coding rate R is 3/4, and the packet length is identified as a fixed length of 12 symbols. Incidentally, 111
Is reserved.

Next, an example of the packet transmission process will be described with reference to the flowchart of FIG. First, in step ST-1, asynchronous transmission information is obtained (received) by the interface 24 in FIG. In step ST-2, for example, it is determined whether or not it is necessary to wirelessly transmit the information by referring to the destination (Destination) ID information or the like described in the asynchronous packet of IEEE1394. If it is not necessary, the process exits from the NO branch.

When it is determined in step ST-2 that wireless transmission is necessary, in step ST-3, a destination communication station is designated with reference to the above-mentioned destination ID information and the like. Further, in step ST-4, information on a combination of a modulation scheme and a convolutional coding rate suitable for transmission of a data payload portion addressed to the corresponding destination communication station is acquired, and the transmission control information is obtained in step ST-5. Construct as header information.

Further, in step ST-6, a data payload portion to be transmitted is set. Then, step ST
At -7, it is determined whether fragmentation of this data payload is necessary. Here, if the asynchronous transmission information exceeds the predetermined data payload size,
When constructing a plurality of wireless transmission packets and performing wireless transmission, fragmentation is performed from the NO branch.

If the asynchronous transmission information is equal to or smaller than the predetermined data payload size or is the last radio packet that has been fragmented, the branch of YES causes the retransmission control timer to be set in step ST-8. Do,
Subsequently, in step ST-9, after adding a predetermined preamble, in step ST-10, the packet is subjected to transmission processing based on predetermined access control.

Next, an example of the packet receiving process will be described with reference to the flowchart of FIG. In this packet receiving process, when returning a reception confirmation, a return packet of a combination of a higher-quality modulation method and a convolutional coding rate is constructed and wirelessly transmitted.

First, in step ST-1, the preamble added to the head of each radio transmission packet is received,
In step ST-2, the header information is received and decoded, and in step ST-3, it is determined whether the reception of the header information was successful, that is, whether the header information was correctly decoded. Here, the configuration uses the result of the CRC check.
If the decoding of the header information is not successful, the branch of NO
Attempt to receive the preamble again.

If the decoding of the header information is successful, in step ST-4, information on the modulation scheme and convolutional coding rate of the data payload portion is obtained from the header information,
In step ST-5, a data payload portion is received. Further, in step ST-6, it is determined whether or not the reception of the data payload portion was successful. Here the CRC
The configuration uses the result of the check. If decoding is successful, the sequence number of the payload is created as ACK (Acknowledge: acknowledgment) information in step ST-7.

If decoding is not successful, the sequence number of the data payload is set to NACK (Not-Acknowledge: negative acknowledgment) information in step ST-8.
Thereafter, in step ST-9, it is determined whether or not the processing of the received packet has been completed.
Returning to step ST-1, the receiving process is continued. Here, it is determined whether or not the processing of a series of received packets is completed over a predetermined period (cycle). Alternatively, it may be determined that the packet reception processing has been completed by receiving from the start flag to the end flag of the fragmented packet.

If it is determined in step ST-9 that the processing has been completed, then in step ST-10, A
The construction of the packet of the CK information is performed. First, in step ST-11, the information of the modulation scheme and convolutional coding rate of the payload portion finally transmitted is referred to.

In step ST-12, it is determined whether or not there is NACK information in the series of reception information.
If there is no information, the information of the modulation method and the convolutional coding rate is used from the NO branch. If there is NACK information, in step ST-13, it is determined whether or not it is possible to return with a high-quality modulation method and convolutional coding rate. , Using the information of the current modulation scheme and convolutional coding rate. If it is possible, in step ST-14, the information of the modulation method and the convolutional coding rate of the payload portion is changed.

Then, in step ST-15, header information is constructed, and in step ST-16, a predetermined preamble is added. In step ST-17, a packet of ACK information is returned based on predetermined access control. Processing (transmission processing) is performed.

Next, the packet retransmission control processing will be described with reference to the flowchart of FIG. Here, when performing packet retransmission, construct a retransmission packet of a combination of a higher quality modulation scheme and a convolutional coding rate,
Wireless transmission.

First, in step ST-1, it is determined whether or not an ACK information packet has been received. If it has not been received, the branch of NO is detected in step ST-2 as to whether or not the retransmission timer has timed out. If the timeout has not occurred, the process returns to the determination of the reception of the ACK information packet again from the NO branch. Here, when the packet of the ACK information is received, YES in step ST-1
Then, the process proceeds to step ST-3, and it is determined whether or not the ACK information of all units is obtained (in the case of a fragmented packet, all reception is completed).

When all units have received the ACK information, in step ST-4, all the information of the buffer stored for retransmission can be deleted and the process can be exited. If the NACK information exists in some of the units, in step ST-5, the NACK data part to be retransmitted is reset, and the process proceeds to step ST-7.

If it is determined in step ST-2 that the retransmission timer has timed out, all the data is reset as data to be retransmitted in step ST-6 from YES branch. Shift to -7.

Then, in step ST-7, the number of retransmissions is determined, and if this value does not exceed the maximum number of retransmissions, it is finally transmitted in step ST-8 from the NO branch. Reference is made to information on the modulation scheme and the convolutional coding rate. In step ST-9, it is determined whether or not transmission with a high-quality modulation scheme and convolutional coding rate is possible. If transmission is not possible, the current modulation scheme and convolution are determined by branching NO. Utilizes information on the coding rate. If it is possible, in step ST-10, the information of the modulation method and the convolutional coding rate of the payload portion is changed.

Then, in step ST-11, header information is constructed, and in step ST-12, a retransmission timer is set, and the number of retransmissions is added.
After adding a predetermined preamble, step ST
At -14, the packet is retransmitted based on the predetermined access control. If it is determined in step ST-7 that the maximum number of retransmissions has been exceeded, in step ST-15, all buffer information stored for retransmission is discarded, and step ST-15 is performed. At -16, the upper layer is notified that transmission is impossible.

[0076]

According to the first aspect of the present invention, in a wireless transmission method for transmitting packetized data in a predetermined information unit, information is transmitted by dividing a packet into a header information portion and a data payload portion. To form a wireless packet by designating the modulation method and convolutional coding rate of the data payload part in specific bits of the header information part,
Since the packetized data is transmitted using the wireless packet, a wireless transmission method capable of designating an arbitrary modulation method and a convolutional coding rate can be obtained.

According to the second aspect of the present invention, in the first aspect of the present invention, the header information portion has a predetermined format specified on the transmission line without depending on the modulation scheme and the convolutional coding rate of the data payload portion. Since the modulation method and the convolutional coding rate are used, the same effect as that of the first aspect of the present invention can be obtained.
A wireless transmission method capable of performing information transmission using an arbitrary modulation scheme and a convolutional coding rate can be obtained.

According to the third aspect of the present invention, in the first aspect of the present invention, for the data payload portion, one packet is formed for a predetermined information unit, whereby:
Since a wireless packet having a variable length is configured according to the modulation scheme and the convolutional coding rate, the same effect as that of the first aspect of the present invention can be obtained. A configurable wireless transmission method can be obtained.

According to a fourth aspect of the present invention, in the first aspect of the present invention, for a data payload portion, one packet is configured to have a fixed length for a plurality of information units, thereby providing a modulation scheme and convolutional coding. Independent of the rate,
Since a fixed length wireless packet is configured, the same effect as that of the first aspect of the present invention can be obtained, and a fixed length wireless packet can be configured without depending on the modulation method and convolutional coding rate. A transmission method can be obtained.

According to the fifth aspect of the present invention, packetized data is transmitted from the source communication station to the destination communication station in a predetermined information unit, and the reception of the packet is confirmed by the destination communication station. In a wireless transmission method that uses a confirmation method in which a station replies to a source communication station, for reception confirmation, a modulation method that is more reliable than a modulation method and a convolutional coding rate of a packetized data payload portion is used. Since the acknowledgment packet is constructed using the convolutional coding rate, it is possible to obtain a wireless transmission method capable of reliably returning the acknowledgment.

According to the sixth aspect of the present invention, in a wireless transmission method for transmitting packetized data in a predetermined information unit from a source communication station to a destination communication station, a packet is defined as a header information part. , And construct a packet separately from the data payload part, and confirm receipt of the packet.
If a confirmation method is used to reply to the source communication station from the destination communication station and a reception confirmation is received, but retransmission of a part of the packet is necessary, the modulation method and convolution of the data payload part of the packet are used. Since a retransmission packet with a changed coding rate is constructed, a wireless transmission method capable of reliably retransmitting packetized data can be obtained.

According to the seventh aspect of the present invention, in a wireless transmission method for transmitting data from a source communication station to a destination communication station using packetized data in a predetermined information unit, A packet is constructed by dividing it into an information part and a data payload part, and the reception confirmation of the packet is confirmed by a method of replying from the receiving communication station to the transmitting communication station after a certain period of time. In the case where the reception confirmation information cannot be received, the retransmission packet is formed by changing the modulation method and the convolutional coding rate of the data payload portion of the packet, so that a wireless transmission method capable of reliably performing retransmission can be obtained. You.

According to the eighth aspect of the present invention, means for constructing a data payload for a predetermined information unit with respect to asynchronous transmission information, means for adding predetermined header information for the data payload, and A means for designating a modulation scheme and a convolutional coding rate of a data payload portion, and a means for adding a preamble to the data payload and header information, having an asynchronous transmission device in a wireless network system, Since wireless transmission is performed in accordance with the access control procedure, it is possible to obtain a wireless transmission device capable of performing wireless transmission by combining an arbitrary modulation method and a convolutional coding rate.

According to the ninth aspect of the present invention, a means for receiving a predetermined preamble, a means for decoding header information added to the received predetermined preamble, and a method for decoding the header based on the decoded header information Means for specifying the modulation scheme and convolutional coding rate of the payload portion following the information, and means for decoding the payload part as asynchronous information based on the specified modulation scheme and convolutional coding rate. Since there is an asynchronous transmission device in the network system used, it is possible to obtain a wireless receiving device capable of decoding the payload portion as asynchronous information based on the header information.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a wireless network system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a configuration example of a wireless transmission frame according to an embodiment of the present invention.

FIG. 3 is a block diagram illustrating an example of a wireless transmission device according to an embodiment of the present invention.

FIGS. 4A, 4B, and 4C are explanatory diagrams illustrating respective configuration examples of a wireless packet according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration example of a wireless packet according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a configuration example of a wireless packet according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram illustrating a configuration example of a wireless packet according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a configuration example of a wireless packet according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a configuration example of header information according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a configuration example of a data payload according to the embodiment of the present invention.

FIG. 11 is a table illustrating an example of allocation of a modulation scheme and a coding rate according to an embodiment of the present invention.

FIG. 12 is a flowchart illustrating an example of a packet transmission process according to the embodiment of the present invention.

FIG. 13 is a flowchart illustrating an example of a packet reception process according to the embodiment of the present invention.

FIG. 14 is a flowchart illustrating an example of a reproduction control process according to the embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 11 personal computer, 12 printer output device, 13 magnetic recording / reproducing device (VTR), 14 set-top box, 15 telephone device, 16 television receiver, 17 game device, WNT wireless network, 101-103 wireless transmission device (terminal communication Station), 1
04 wireless transmission device (control station), L1 to L4 cable, 21 antenna, 22A to 22D wireless processing unit, 2
3 Data conversion unit, 24 interface, 25 control unit, 26 internal memory, 27 serial bus, 28
Equipment to be connected.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04L 12/28 H04L 11/00 310B 5K033 12/56 11/20 102A 5K034 29/08 13/00 307Z 9A001 F term (reference) 5J065 AA01 AB01 AC02 AD04 AD10 AF02 AH06 5K004 AA05 AA08 FA05 JA02 JB01 5K014 AA01 BA06 BA10 DA01 FA11 HA06 5K028 AA14 BB04 DD02 EE08 5K030 GA11 HB02 HB12 HC09 JT02 LA02 MB11 5301 HH11 HH63 MM01 NN12 PP05 9A001 CC05

Claims (9)

[Claims] 1. A wireless transmission method for transmitting packetized data in a predetermined information unit, wherein said packet is divided into a header information portion and a data payload portion, and information is transmitted. A wireless packet is formed by designating a modulation scheme and a convolutional coding rate of the data payload portion to specific bits, and the packetized data is transmitted using the wireless packet. Transmission method. 2. For the header information part, a predetermined modulation scheme and a convolutional coding rate specified on a transmission path are used without depending on a modulation scheme and a convolutional coding rate of the data payload part. The wireless transmission method according to claim 1, wherein: 3. The data payload portion,
2. The wireless transmission method according to claim 1, wherein one packet is formed for a predetermined information unit to form a wireless packet having a variable length according to a modulation scheme and a convolutional coding rate. . 4. The data payload portion includes:
2. A wireless packet having a fixed length without depending on a modulation scheme and a convolutional coding rate by configuring one packet as a fixed length for a plurality of information units. The wireless transmission method according to the above. 5. The transmission of packetized data in a predetermined information unit from a source communication station to a destination communication station, and the reception confirmation of the packet is transmitted from the destination communication station to the source communication station. In a wireless transmission method using a confirmation method that responds to the request, the reception confirmation is performed based on a modulation scheme and a convolutional coding rate of the packetized data payload,
A wireless transmission method comprising constructing a confirmation packet using a highly reliable modulation scheme and a convolutional coding rate. 6. A wireless transmission method for transmitting packetized data in a predetermined information unit from a source communication station to a destination communication station, wherein the packet is divided into a header information part and a data payload part. A packet is constructed by dividing the packet, and the reception confirmation of the packet is transmitted from the destination communication station to the transmission source communication station using a confirmation method. Although the reception confirmation is received, it is necessary to retransmit a part of the packet. A wireless transmission method characterized by constructing a retransmission packet in which a modulation scheme and a convolutional coding rate of a data payload portion of the packet are changed, if any. 7. A wireless transmission method for transmitting data from a source communication station to a destination communication station using data packetized in a predetermined information unit, wherein the packet includes a header information portion, a data payload, A packet is constructed by dividing the packet into parts and a confirmation method is used in which the reception confirmation of the packet is returned from the destination communication station to the transmission source communication station. A wireless transmission method, wherein when it is impossible, a retransmission packet is formed by changing the modulation scheme and convolutional coding rate of the data payload portion of the packet. 8. A means for constructing a data payload for a predetermined information unit with respect to asynchronous transmission information, a means for adding a predetermined header information with respect to the data payload, a modulation method for a data payload portion in the header information Means for specifying a convolutional coding rate, and means for adding a preamble to the data payload and header information, comprising: an asynchronous transmission device in a wireless network system; A wireless transmission device for performing transmission. 9. A means for receiving a predetermined preamble, a means for decoding header information added to the received predetermined preamble, and a part of a payload portion following the header information based on the decoded header information. Means for specifying a modulation scheme and a convolutional coding rate; based on the specified modulation scheme and the convolutional coding rate,
A means for decoding the payload portion as asynchronous information, comprising: an asynchronous transmission device in a wireless network system.