JP2002135304A - Wireless network system - Google Patents

Wireless network system

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Publication number
JP2002135304A
JP2002135304A JP2000318816A JP2000318816A JP2002135304A JP 2002135304 A JP2002135304 A JP 2002135304A JP 2000318816 A JP2000318816 A JP 2000318816A JP 2000318816 A JP2000318816 A JP 2000318816A JP 2002135304 A JP2002135304 A JP 2002135304A
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Japan
Prior art keywords
wireless
unit
units
data stream
transmission
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Granted
Application number
JP2000318816A
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Japanese (ja)
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JP3652233B2 (en
Inventor
Norio Yoshida
式雄 吉田
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Sharp Corp
シャープ株式会社
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Priority to JP2000318816A priority Critical patent/JP3652233B2/en
Publication of JP2002135304A publication Critical patent/JP2002135304A/en
Application granted granted Critical
Publication of JP3652233B2 publication Critical patent/JP3652233B2/en
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Abstract

(57) [Summary] [PROBLEMS] To realize a real-time transmission of a wideband data stream exceeding a transmittable bandwidth per channel of a wireless network. SOLUTION: A plurality of first wireless units 24a and 24b are provided in a gateway 20 for transmitting and receiving a data stream to and from an external information source, and wireless signals corresponding to the first wireless units 24a and 24b are transmitted. Information device 3 having a plurality of second wireless units 34a and 34b for transmitting and receiving
0, the broadband data stream is divided into a plurality of data packets, sequentially distributed and distributed to the plurality of first or second wireless units 24a, 24b or 34a, 34b, and transmitted in parallel. , A plurality of corresponding second or first wireless units 34
Each of the gateway 20 and the information device 30 has distribution and assembly control means 23a / 33a for assembling the data packets received in parallel by a, 34b or 24a, 24b into the original data stream.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless network system for home / office, and more particularly, to a digital subscriber line xDSL (CATL cable or telephone line forming a wired or wireless access communication network). x
Terminates a wired access line such as a Digital Subscriber Line or a wireless access line such as a WLL (Wireless Local Loop), and communicates with information devices at home / office via a home / office wireless network. A gateway having a communication unit system for realizing exchange, and positioning the communication unit system as a wireless access point, and real-time transmission of broadband information such as MPEG-2 data between the wireless access point and each information device. The present invention relates to a wireless network system.

[0002]

2. Description of the Related Art At present, an IEEE capable of configuring a high-speed wireless network system for home / office is available.
Various products conforming to the 802.11b standard have begun to appear on the market. In this standard, the conventional IEEE8
The physical transmission speed in the 02.11 standard is 2 Mbps
Is increased to 11 Mbps using CCK modulation. However, the effective transmission rate indicating how fast a data stream to be actually transmitted can be transmitted is 5 Mb, which is half of the physical maximum transmission rate.
It will drop to around ps. That is, a data stream to be transmitted is divided into a plurality of data packets, and header information including information for transmission control including a destination, a packet length, a packet number, and the like, and information for error correction control are added to each data packet. IP (Internet Protoco
l) Sent as a packet. On the other hand, since an ACK (Acknowledgement) signal indicating whether or not the IP packet has been correctly received from the other party specified by the destination is returned, the IP packet that could not be correctly received is retransmitted while confirming the ACK signal. The operation to make it happen.
Therefore, on average, the amount of data in the effective data stream that can be sent to the destination is IEEE
It is not possible to transmit at 11 Mbps, which is the physical transmission rate of a wireless network conforming to E802.11b, as it is. Depending on the environmental conditions of the transmission system, empirically, the effective transmission rate is only about 5 Mbps, which is about half. The fact is that transmission is not possible.

FIG. 5 is a configuration diagram of a home / office wireless network system in a conventional embodiment.
The home / office wireless network system 10
In a home / office, a gateway 20 for interconnecting with an access network constituting a wired or wireless external communication network, and information from the access network as it is or by performing various information processing An information device 30 for displaying or, on the contrary, transmitting various information to the access network, comprises a wireless signal compliant with the IEEE 802.11b standard or the like between the gateway 20 and the plurality of information devices 30. Is transmitted and received.

[0004] A gateway 20 terminates a wired or wireless access line 1 from the access network, and transmits information received from the access network to a specific information device 30 via a wireless network in a home / office. The communication unit system 21 is provided. The communication unit system 21 includes an access terminating unit 22 for terminating an access line 1 from the access network, and a signal between a signal exchanged with the access network and a signal transmitted to and received from an information device 30 in a home / office. A signal interface unit 23 for controlling format conversion and the like;
It has a first wireless unit 24 for transmitting and receiving wireless signals conforming to the IEEE 802.11b standard to a wireless network in a home / office via an antenna 25.

On the other hand, the information equipment 30 is a terminal unit system for transmitting and receiving information between the information equipment main body 39 such as a personal computer and a television receiver, and information between the information equipment main body 39 and a wireless network in a home / office. 31. The terminal unit system 31 includes the antenna 3
5, IEEE802.1 with the first wireless unit 24 via a wireless network in the home / office
It has a second wireless unit 34 for transmitting and receiving a wireless signal conforming to the 1b standard, and a terminal interface unit 33 for controlling transmission of information based on the wireless signal to and from the information equipment main body 39.

Here, the communication unit system 21 is provided one by one in one-to-one correspondence with the access line 1 for connecting to the access network, while the terminal unit system 31 is provided for each information equipment terminal main body. One for each 39. In addition, the first wireless unit 24 and the second wireless unit 34 forming the wireless network in the home / office are configured to be mounted one each for the communication unit system 21 and the terminal unit system 31, respectively. ing.

Therefore, in the conventional home / office wireless network system 10, the first wireless unit 24 built in the communication unit system 21.
The information transmission between the terminal unit system 31 and the second wireless unit 34 incorporated in the terminal unit system 31 is based on IEEE802.1.
A pair of a first wireless unit 24 and a second wireless unit 34 (hereinafter referred to as first and second wireless units 24 and 34 compliant with the 1b standard). And may be changed). Since the physical transmission speed of the pair of the first and second wireless units 24 and 34 is 11 Mbps, the effective transmission speed (that is, the effective transmission speed Transmission bandwidth) is almost half of 5M
A wireless network having a band of about bps can be constructed.

[0008]

However, when a video signal such as a moving image is transmitted in a wireless network system conforming to the IEEE802.11b standard like a conventional wireless network system for home / office, it is difficult to use a band. MPEG-2 (Mo
ving Picture Experts Group-2) Even if it is not transmitted as data, the bandwidth of the MPEG-2 data stream is 6
Mbps, so IEEE 802.11b
Effective transmission speed 5M of compliant wireless network system
In bps, it runs short. Furthermore, about 20 Mbps
High-definition television HDTV (Hi-
gh Definition Television), even if the data stream is distributed using a wireless network system compliant with the IEEE 802.11b standard, the effective transmission speed is completely insufficient.

That is, such a broadband data stream such as MPEG-2 or HDTV sent over a CATV cable or the like is received by an access terminal unit (gateway device for home / office), and IEEE80
Even if an attempt is made to transmit the broadband data stream in real time by transmitting the information to a home / office personal computer or a television receiver using a wireless network compliant with the 2.11b standard, the effective transmission speed is as follows. Not enough. Therefore, as in the home / office wireless network system shown in FIG.
At an effective transmission speed of 5 Mpbs between a pair of wireless units conforming to the 2.11b standard, 6 Mbp of an MPEG-2 signal is used.
There is a problem that a broadband data stream of about 20 Mbps of s, HDTV signal cannot be transmitted, and real-time video display cannot be performed.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has been made in accordance with the IEEE 80 standard for constructing a wireless network system in a home / office.
For a pair of wireless units compliant with 2.11b, when transmitting a wideband data stream (eg, a video data stream) that exceeds the effective transmission rate of the pair of wireless units,
Two or more pairs of wireless units that can fill the bandwidth of the broadband data stream can be used simultaneously. For example, two pairs of wireless units can be used simultaneously in an MPEG-2 data stream, and four pairs of wireless units can be used in an HDTV data stream. That is, a broadband video data stream such as MPEG-2, HDTV or the like is divided into a plurality of IP packets and sequentially distributed to a plurality of first wireless units provided in a communication unit system. Are transmitted in parallel using a plurality of radio signals of two or more channels from a radio transmitter at the same time. On the other hand, the terminal unit system has a plurality of second radio signals provided corresponding to the first radio unit. The IP packets received in parallel by the wireless receiver in the wireless unit are collected and rearranged based on the packet number assigned to each IP packet to reconstruct the original MPEG-2, HDTV video data stream. Is what you do. Thus, in the case of transmitting a wideband video data stream, by simultaneously using two or more pairs of the first and second wireless units, the desired effective transmission speed (effective transmission band) is obtained. A band can be secured, and for example, a video data stream can be transmitted and received in real time using a first / second wireless unit pair conforming to the IEEE 802.11b standard at an arbitrary place in a home / office. An image based on the data stream can be displayed in real time on an information device such as a personal computer, a television receiver, or a display device.

In the wireless network system according to the present invention, when transmitting and receiving a wireless signal conforming to the IEEE802.11b standard using two or more pairs of the first and second wireless units, there are mainly And only one pair of main wireless units
Regarding transmission and reception of P packets, IEEE 802.11b
Transmission control conforming to the standard shall be performed, and the other sub wireless unit pairs will be activated in conjunction with the main wireless unit pair, and the transmission and reception of IP packets between the sub wireless unit pairs will be described. The transmission control may be performed by letting the main wireless unit pair exchange control signals. In such a case, in order to satisfy the effective transmission speed, the sub-radio unit pair simply performs an operation of wirelessly transmitting an IP packet in parallel with the main radio unit pair and other sub-radio unit pairs. Becomes Therefore, even if a plurality of pairs of wireless units are physically used, logical transmission control can be realized by only one pair of main wireless units, so that transmission control of a wireless network can be simplified. Becomes

The specific technical means of the wireless network system according to the present invention are as follows. A first technical means includes a gateway having a first wireless unit for transmitting / receiving a data stream to / from an external information source and transmitting / receiving the data stream as a wireless signal to / from an information device; and the first wireless unit. In a wireless network system comprising an information device having a second wireless unit for transmitting and receiving wireless signals in correspondence with the first wireless unit and the second wireless unit for transmitting and receiving wireless channel signals having different frequencies from each other, A wireless unit is disposed in each of the gateway and the information device, and a pair of wireless units including the first wireless unit and the second wireless unit (hereinafter, referred to as the first and second wireless unit pairs) )), When transmitting and receiving a wideband data stream exceeding the effective transmittable bandwidth of - assigning the second radio unit pair simultaneously as a radio unit for transmitting and receiving wideband data stream, wideband data stream a plurality of said first
Wireless unit or the second wireless unit (hereinafter, referred to as
Distribution control means for performing control for dividing and distributing the data packets to the first / second wireless units) and a plurality of the first / second wireless units. Each of the gateway and the information device includes an assembly control unit that receives the data packets from the plurality of second wireless units or the first wireless units and assembles them into an original broadband data stream. A wireless network system characterized by the above.

[0013] The second technical means is the first technical means, in connection with the transmission and reception of the broadband data stream, a specific one of a plurality of pairs of the first and second wireless units for transmitting and receiving the data packet. Only one pair of the first and second wireless unit pairs controls transmission of all the data packets as a main wireless unit pair,
The remaining plural pairs of the first and second wireless units perform a data packet transmission / reception operation in accordance with transmission control of the main wireless unit pair.

[0014] The third technical means is the transmission means for storing the data packet corresponding to the effective transmittable band of each of the first and second wireless units in the first or second technical means. A buffer memory provided in each of the first / second wireless units, wherein the data packets exceed the amount of data packets that can be stored in the buffer memory provided in a certain first / second wireless unit; When there is a transmission request, the data packet that cannot be completely accumulated in the buffer memory is transferred to and stored in a buffer memory provided in another of the first and second wireless units, and the other 1/2 A wireless network system having transmission packet storage means for controlling transmission from a second wireless unit.

[0015] A fourth technical means is the wireless network according to any one of the first to third technical means, wherein a wireless signal constituting the wireless network system complies with the IEEE 802.11b standard. System.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a home / office wireless network according to the present invention. FIG. 1 is a configuration diagram showing an embodiment of a home / office wireless network system according to the present invention. A home / office wireless network system 10 shown in FIG. 1 includes a gateway 20 connected to an access line 1 connected to an external access network.
And a plurality of information devices 30A, 30B,... (In FIG. 1, a personal computer 30A and a television receiver 30B are shown). Here, as an access network, for example, the gateway 20 is disposed in a one-to-one correspondence with a wired access line 1 such as a CATV cable, and a plurality of gateways 20 in a communication unit system 21 provided in the gateway 20 are provided. Antennas 25A, 25b,... Are provided for each first wireless unit.

Each of the information devices 30A and 30B controls transmission and reception of data between the personal computer body 39A and the television receiver body 39B, which are the information device main bodies, and the respective information device main bodies and the communication unit system 21. Terminal unit systems A, B 31A, 31B are provided, and each terminal unit system A, B 31A, 31B is provided.
B for each of the plurality of second wireless units in B
Aa, 35Ab, ..., 35Ba, 35Bb, ... are provided. Here, when the data stream received from the external information providing source (information source) via the access line 1 such as a CATV cable is a data stream requiring a wide band (for example, a video data stream), the communication unit system 21 , The data stream is divided into a plurality of data packets, distributed as an IP packet to a plurality of first wireless units in parallel, and transmitted as a wireless signal conforming to the IEEE 802.11b standard for each first wireless unit. Are transmitted in parallel from the antennas 25a, 25b,.

On the other hand, the information devices 30A and 30B that receive the plurality of radio signals in parallel correspond to the antennas 25a, 25b... Connected to the first radio units on the communication unit system 21 side, respectively. And multiple second
, 35Ba, 35Bb,... Connected to each of the wireless units, respectively, and the divided wireless signals are respectively transmitted to the antennas 32Aa, 32Ab,.
Bb,... And the terminal unit systems A, B 31A, 31B via the plurality of second wireless units to which the plurality of antennas are respectively connected, collect the respective IP packets, By reconstructing, the original wideband data stream is reproduced. The reproduced data stream is sent to the personal computer main unit 39A and the television receiver main unit 39B for display.

That is, in the present invention, two or more pairs of wireless units and antennas respectively connected thereto are mounted on a communication unit system and a terminal unit system, respectively. The effective transmission speed of the data stream to be transmitted by expanding the network transmission band (effective transmission band)
Is made faster (broader bandwidth) so that a data stream requiring a wide bandwidth such as a video data stream can be transmitted and received in real time.

Next, a detailed configuration of the home / office wireless network system 10 according to the present invention will be described with reference to FIG. FIG. 2 is a diagram showing a detailed configuration of the communication unit system and the terminal unit system that constitute the wireless network system according to the present invention.
Generally, in a home / office, a plurality of terminal unit systems are arranged corresponding to a plurality of information devices. In the present invention, since each of the plurality of terminal unit systems has the same configuration, 2 shows only one of the terminal unit systems. As described above, the communication unit system 21 includes an access system terminating unit 22 for terminating the access line 1 from the access network, a signal for exchanging with the access network, and information equipment in the home / office. A signal interface unit 23 for controlling conversion of a signal format between a terminal unit system 31 and a signal to be transmitted and received, and a plurality of antennas 25a and 25
and a plurality of first wireless units 24a, 24b,... which transmit and receive wireless signals conforming to the IEEE802.11b standard over a wireless network in the home / office through the wireless communication networks b,.

On the other hand, the terminal unit system 31 is provided with a plurality of first wireless units 24 of the communication unit system 21.
a, 24b, ..., the first wireless unit 24
antennas 25a, 25 connected to a, 24b,.
b,... are transmitted to a plurality of antennas 35, respectively.
a, 35b, and a plurality of second wireless units 34a,
34b,... And a terminal interface unit 33 for controlling transfer of a data stream based on the wireless signal to an information device main body 39 which is a main body such as a personal computer or a television receiver.

The signal interface unit 23 according to the present invention includes an access line in preparation for transmitting / receiving a wideband data stream that cannot be transmitted in real time in the effective transmission band of a pair of wireless units to / from a wireless network. 1 is divided into a plurality of IP packets and sequentially distributed to a plurality of first wireless units 24a, 24b,..., Or conversely, a plurality of first wireless units 24a, 24a, 24b.. Has a distribution and assembly control subunit 23a for reassembling a plurality of received IP packets and assembling them into an original broadband data stream.

On the other hand, in the terminal interface unit 33, corresponding to the distribution / assembly control subunit 23a,
From the wireless network, a plurality of antennas 35a, 35b ...
And reassemble a plurality of IP packets received via the second wireless units 34a, 34b,... And assemble them into the original broadband data stream. And an assembly distribution control sub-unit 33a for sequentially distributing and distributing to a plurality of second wireless units 34a, 34b.
have.

Next, the operation of each part of the wireless network system shown in FIG. 2 will be described. First, the information equipment body 3
9 via an access line 1 from an access network constituting a wired or wireless communication network,
A connection to a desired external information source (not shown) is made, and a data stream such as a video data stream is transmitted from the information source to the access system termination unit 22 via the access line 1. In the access system terminating unit 22, the data stream is demodulated into a baseband signal, and the signal interface unit 23
Transfer to In the distribution / assembly control subunit 23a in the signal interface unit 23, the demodulated baseband signal is reassembled into an original data stream such as MPEG-2.

Further, the signal interface unit 23
The distribution / assembly control sub-unit 23a within the base station identifies that it is a broadband data stream that cannot be transmitted in real time in the effective transmission band of a pair of wireless units based on control information and the like in the wideband data stream The distribution / assembly control sub-unit 23a decomposes the data stream into a plurality of data packets, adds information indicating that the data stream is a broadband data stream, a packet number, and the like as a header to form an IP packet, and a first , And the generated IP packets are sequentially transmitted to the wireless units 24a, 24b,. Here, for example, assuming that the number of wireless units 24a, 24b,... Is N, the number of 1 / N IP packets of the total number of IP packets obtained by dividing and generating the original data stream is one first packet.
In the case where the effective transmission rate per one first wireless unit, that is, the effective transmission band is only T Mbps, and the entire N wireless units constituting the entire wireless network are: T Mb
A transmission bandwidth of N times ps can be secured. Therefore, if the transmission bandwidth of T × N Mbps of the entire wireless network is equal to or more than the required transmission bandwidth of the wideband data stream, the wideband data stream can be transmitted in real time via the wireless network. That is, the number of wireless units to be installed is calculated according to the size of the band of the data stream to be transmitted through the wireless network, and a plurality of wireless units are arranged after the signal interface unit 23 in the communication unit system 21 as necessary. Thus, the communication unit system 21 is configured. Further, each of the first wireless units 24a, 24b,
... are connected to antennas 25a, 25b, ...
Radio signals are transmitted in parallel from each antenna 25a, 25b,... Occupying the number of radio channels by the number of the first radio units.

On the other hand, a personal computer installed at an arbitrary place in a home / office or an information device such as a television receiver is equipped with a terminal unit system 31 to connect a wireless network in the home / office. Through I
An IP packet transmitted as a wireless signal conforming to the EEE 802.11b standard is received. The terminal unit system 31 has the same number of second wireless units 34a, 34b,... Corresponding to the first wireless units 24a, 24b,. Receive the IP packet of the corresponding wireless channel and input it to the assembly distribution control sub-unit 33a in the terminal interface unit 33 arranged at the subsequent stage.

The assembling / distributing control sub-unit 33a, when identifying that the original data stream is a signal of a broadband data stream such as MPEG-2 based on the control information of the header part of the received IP packet, The IP packets sent from the second wireless units 34a, 34b,... Are reassembled based on the packet numbers to reconstruct the original broadband data stream such as MPEG-2. The reconstructed broadband data stream is output from the terminal interface unit 33 to the information equipment main body 39 (the personal computer main body, the television receiver main body, and other display main bodies). In the information device main body 39, if the wideband data stream is a video data stream, a video decoder (for example, MPE)
G-2 decoder or the like) converts the received broadband data stream signal into a video signal for display, and displays it on a display screen.

In the case of transmitting / receiving a narrow band data stream in which a pair of wireless units can transmit / receive a data stream in real time, or a large amount of data stream which does not require real time, only a certain pair of wireless units Is used to transmit and receive wireless signals,
Other wireless unit pairs can be used in parallel for transmission of other data streams.

As described above, the home / home system is provided by the communication unit system 21 provided for each access line 1 and the terminal unit system 31 provided for each of a plurality of information devices.
An office wireless network system 10 is configured.

When a signal transmitted and received on the access line 1 is composed of an IP packet having the same transmission control procedure as an IP packet transmitted and received in a home / office wireless network, for example, the above-described signal interface The distribution / assembly control unit 23a in the unit 23 reconstructs the IP packet received from the outside via the access line 1 into a data stream, and converts the IP packet into an IP packet again for transmission to the home / office wireless network. Omitting the assembling / disassembling process, reediting only the header information such as the destination and packet number for the home / office wireless network, and distributing the received IP packets to the first wireless units 24a, 24b,. And send it.

Next, another embodiment of the wireless network system for home / office according to the present invention will be described with reference to FIG. An object of the present embodiment is to simplify transmission control on a wireless network and facilitate wireless network control even when a plurality of pairs of wireless units are used simultaneously for transmission of one broadband data stream. It is assumed that. In FIG. 3, a specific pair of a plurality of pairs of wireless units is a main wireless unit pair of the first and second main wireless units 26a and 36a, and the other wireless unit pairs are the first and second wireless units. By forming a pair of second sub radio units 26b, 36b,... As a sub radio unit pair, exchange of various transmission control signals such as a control signal for determining an access right can be performed by a pair of first and second main radio units. Wireless unit pair 26
a. 36a. Thus,
Apparently, only one pair of the main wireless unit pair 26a and 36a conforming to the IEEE 802.11b standard is provided by the communication unit system 21 and the terminal unit system 31.
It is intended to be able to handle logically as it is mounted on.

In the embodiment shown in FIG.
For example, from the communication unit system 21 to the terminal unit system 31, two pairs of first and second wireless units 24
In the case of transmitting a wideband video data stream using the a.34a and 24b.34b, the distribution and assembly control subunit 23a in the signal interface unit 23 has a divided IP for transmitting the video data stream.
About half of the number of packets (or the number of packets of about 1 / N when there are N first wireless units) is distributed to the first wireless units 24a and 24b. Each of the first wireless units 24a and 24b performs wireless transmission of each IP packet by using a plurality of channels having different frequencies in parallel. On the other hand, the second wireless units 34a and 34b respectively corresponding to the terminal unit system 31 individually receive the IP packets and then transmit the IP packets to the terminal interface unit 33, respectively. The assembling / distributing control subunit 33a in the terminal interface unit 33 collects all the IP packets, reconfigures them, and returns to the original video data stream. Here, the first and second wireless unit pairs 24
In this system, transmission control based on the IEEE 802.11b standard is performed independently for each wireless unit pair a.34a and 24b.34b.

On the other hand, in the embodiment shown in FIG. 3, all of the IP packets divided in the signal interface unit 23 built in the communication unit system 21 are once all specified first main radio units. 26a. When the first main wireless unit 26a determines that the wireless transmission band of the first main wireless unit 26a is insufficient to transmit all transmitted IP packets to the wireless network, The first main wireless unit 26a transmits the incompletely transmitted IP packets to the first sub wireless units 26b,.
.. Sequentially to the first sub wireless units 26b,. Thus, the antennas 25a, 26b,... From the first main wireless unit 26a, the second sub wireless unit 26b,.
, A plurality of said IP packets are transmitted in parallel to a wireless network using a plurality of channels having different frequencies in parallel. On the other hand, each IP packet transmitted in parallel is received by the corresponding second main wireless unit 36a, second sub wireless unit 36b,... In the terminal unit system 31. The IP packets received by the sub second wireless units 36b,...
a. When all the IP packets are collected by the second main wireless unit 36a, the IP packets are sent from the second main wireless unit 36a to the terminal interface unit 33 located at the subsequent stage, where the IP packets are converted to the original broadband data stream. And further converted into a desired video signal such as MPEG-2 or HDTV.

Here, the channel of the wireless transmission frequency between the first and second main wireless units 26a and 36a is a frequency channel used in a wireless network conforming to the IEEE802.11b standard, and the terminal unit The system 31 is a wireless network system used while sharing the frequency channel with another terminal unit system (not shown) to acquire an access right. Naturally, a control signal used for wireless transmission, such as a control signal for acquiring the access right of the frequency channel, is transmitted and received between the main wireless units 26a and 36a. On the other hand, the first and second sub radio units 2
The sub-radio unit pair 6b and 36b are allocated a channel of the radio transmission frequency between the specific communication unit system which requires a wide transmission band for video transmission and the like from a specific communication unit system to a specific terminal unit system in advance and secure the channel. It is unnecessary to transmit and receive a control signal and the like for acquiring the right to access the wireless channel between the sub wireless units, and the IP packet (only data) distributed from the first main wireless unit 26a is used as it is. Performs dripping transmission.

Thus, on the radio transmission path, the main radio unit pairs 26a and 3b, including the IP packets transmitted and received between the sub radio unit pairs 26b and 36b,
6a operates as if the access control conforming to the IEEE 802.11b standard is apparently performed. Also, inside the communication unit system 21, when the first wireless units 26a, 26b,... Are viewed from the output end of the signal interface unit 23, one wireless unit apparently conforming to the IEEE 802.11b standard is provided. Can be regarded as just being. On the other hand, also inside the terminal unit system 31, from the input terminal of the terminal interface unit 33, the second wireless unit 36a,
36b, ... when it looks at the side, it looks like IEEE802.1
It can be considered that there is only one wireless unit conforming to the 1b standard. By using such a configuration, only the transmission band on the wireless network is changed to the conventional IEEE 802.11.
It is possible to construct a wireless network system having a wider band according to the number of sub wireless units installed than the transmission band of wireless signals conforming to the b standard.

Therefore, in the wireless network system having such a configuration, when transmitting and receiving a data stream requiring a wide transmission band, of the two or more pairs of the first and second wireless units constituting the wireless network,
A specific pair of first and second wireless units (in FIG. 3, first and second main wireless units 26a and 36a
Main wireless unit pair) operates as a main wireless unit pair, controls transmission and reception of various control signals conforming to the IEEE802.11 standard, and serves as another pair of first and second sub wireless unit pairs (FIG. In 3, the first and second
Of the sub wireless units 26b, 36b,... Are transmitted and received under the control of the main wireless unit pair. That is, the first and second sub wireless units 26b, 36b,.
The control of the transmission of the IP packet between the pair is entrusted to the exchange of control signals between the main wireless unit pair 26a and 36a, and each sub wireless unit pair 26b and 36b,. It controls only the transmission and reception of signals.

When transmitting and receiving a narrow-band data stream in which wireless data can be transmitted and received in real time by only one pair of wireless units, only the pair of the first and second main wireless units 26a and 36a is used. Since wireless signals are transmitted and received, another pair of wireless units can be simultaneously used in parallel for transmission of another data stream.

Here, only in the case of a wideband data stream requiring a high transmission rate, a plurality of pairs of radio units are used. In the case of a narrowband data stream of a low transmission rate, only one pair of radio units is used. A method of identifying the type of data stream to be transmitted by the main wireless unit on the transmitting side so as to perform wireless communication using the method will be described with reference to FIG. FIG. 4 is a configuration diagram showing a circuit block of a transmission unit of the first main radio unit 26a and the second sub radio unit 26b shown in FIG.
As shown in FIG. 4, the first main wireless unit 26a has a buffer memory 26a capable of temporarily storing a signal of the amount of data that can be transmitted from the first main wireless unit 26a.
1 , the IP packet sent from the signal interface unit 23 is stored in the transmission packet storage unit 26a.
Based on the second control, it is accumulated sequentially in the buffer memory 26a 1. The I stored in the buffer memory 26a 1
P packets, under the control of the transmission packet storage unit 26a 2, is passed to the transmission control unit 26a 3, antenna 25
a.

[0039] When the transmission of the narrowband data streams only take low-speed transmission rate, without any data input from the signal interface unit 23 (IP packet) overflows from the buffer memory 26a 1,
All data (IP packets) through the transmission control unit 26a 3 of the first main radio unit 26a Antenna 2
5a. In other words, communication can be performed only by a pair of wireless units of the first main wireless unit 26a in the communication unit system and the second main wireless unit 36a in the terminal unit system.

On the other hand, a wide band requiring a high transmission speed is used.
In the case of transmission of a band data stream, the signal interface
All data input from the face unit 23
Buffer memory 26a1Overflowing without accumulating
The transmission packet storage unit 26aTwoIs the situation
Is detected, the buffer memory 26a1Overflowing from
The prepared data is provided in the first sub radio unit 26b.
And the first sub wireless unit 26b can transmit.
Buffer memory 26b having a large data amount1Accumulate in
Transmission packet in the first sub wireless unit 26b.
Storage unit 26b TwoStart Activated transmission packet
Storage unit 26bTwoIs the first main wireless unit 26a
Buffer of IP packets transferred from
26b1To accumulate. Buffer memory 26b1Accumulate in
The transmitted IP packet is stored in the transmission packet storage unit 26b.Twoof
Transmission under control within the first sub-radio unit 26b
Control unit 26bThreeThrough the antenna 25b
You. That is, the first main wireless unit 26a transmits
The uncut data (IP packet) is transmitted to the first sub wireless unit.
Transferred to the knit 26b and the two first wireless units 2
Realization of real-time communication using 6a and 26b
Will be done. That is, data that each wireless unit can transmit
Buffer memory for temporarily storing data
By providing one wireless unit, each transmission packet
In the packet storage unit, the accumulated data from each buffer memory
Data overflow to detect either wideband or narrowband data.
Automatically identify the input stream
Can be.

Here, an example of wireless transmission using one or two pairs of wireless units has been described. However, a case where three or more pairs of wireless units are used can be handled by exactly the same control. System can be configured. That is,
When detecting the transmission packet storage unit 26b 2 that the buffer memory 26b 1 of the first sub-wireless unit 26b of the overflows, to that effect a first main radio unit 26
a to the transmission packet storage unit 26a 2 of
Transmission packet storage unit 26a 2 the first other not shown
Then, the transmission packet storage unit of the sub wireless unit is activated.

In the above description, data transmission requiring real-time properties is assumed. However, for large-capacity data transmission such as file transfer that does not require real-time properties, for example, control information in a data stream is used. Or a means of identifying that the real-time property is not necessary by using a TOS (type of service) included in the header of the IP packet or the like, so that a separately prepared large-capacity memory (not shown) ), And sequentially generate IP packets, which can be transmitted and received using only the main wireless unit pair. As a result, the resources of the wireless transmission channel can be saved, and a plurality of prepared sub wireless unit pairs can be used for transmitting another data stream.

[0043]

By providing a plurality of pairs of wireless units capable of transmitting and receiving channel signals of different frequencies, a wideband data stream requiring a high transmission rate can be transmitted in real time even in a wireless network conforming to the IEEE 802.11b standard. Can be transmitted and received. For example, in the case of an MPEG-2 data stream signal, if two pairs of wireless units are used to secure a bandwidth of 6 Mbps, the effective transmission speed is approximately 5 Mbps × 2.
Number = 10 Mbps, and an MPEG-2 data stream signal can be transmitted and received in real time.

Further, a plurality of pairs of wireless units are shared with each other as a main wireless unit pair and a sub wireless unit pair.
By performing transmission control conforming to the E802.11b standard, access control in a wireless network system can be unified. Physically, a plurality of pairs of wireless units are used. The controlling operation is performed in the same manner as in the pair of wireless units, and can facilitate the control of the wireless network.

Also, only in the case of a wideband data stream which actually requires a plurality of units, channels of different frequencies assigned to a plurality of radio units are bundled and occupied as channels for transmission of a wideband data stream. However, in large-capacity data transmission that does not require real-time processing such as file transfer, radio transmission is performed using only one pair of main radio units, and another sub-radio unit pair is used for transmission of another data stream. be able to. That is, a plurality of data streams delivered from an external information source can be simultaneously transmitted to a plurality of different terminal unit systems.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a home / office wireless network system according to the present invention.

FIG. 2 is a diagram showing a detailed configuration of a communication unit system and a terminal unit system constituting a wireless network system according to the present invention.

FIG. 3 is a configuration diagram showing another embodiment of a wireless network system for home / office according to the present invention.

4 is a configuration diagram showing a circuit block of a transmission unit of a main radio unit and a sub radio unit shown in FIG. 3;

FIG. 5 is a configuration diagram of a wireless network system for home / office in a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Access line, 10 ... Home / office network system, 20 ... Gateway, 21 ... Communication unit system, 22 ... Access termination unit, 23 ...
Signal interface unit, 23a: distribution / assembly control subunit, 24, 24a, 24b: first radio unit, 25, 25a, 25b: antenna, 26a: first main radio unit, 26b: first sub radio unit, 26a 1 , 26b 1 ... Buffer memory, 26a 2 , 2
6b 2 ... transmission packet storage unit, 26a 3 , 26b 3 ... transmission control unit, 30 ... information equipment, 30A ... personal computer, 30B ...
Television receiver, 31, 31A, 31B ... terminal unit system, 33 ... terminal interface unit, 3
3a: Assembly distribution control subunit, 34, 34a, 34
b: second wireless unit, 35, 35a, 35b, 35
Aa, 35Ab, 35Ba, 35Bb ... antenna, 36
a: second main wireless unit, 36b: second sub wireless unit, 39: information equipment main body, 39A: personal computer main body, 39B: television receiver main body.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 GA03 GA13 HA08 HC14 HD03 JA05 JL01 KA01 KA03 KA06 LB06 LC09 LE03 LE14 MA13 MB15 5K033 AA02 BA15 CA17 CB06 DA05 DA17 DB13 DB14 DB16 DB18 5K034 AA01 CC02 EE03 EE27 LL07 MM25

Claims (4)

[Claims]
1. A gateway having a first wireless unit for transmitting / receiving a data stream to / from an external information source and transmitting / receiving the data stream as a wireless signal to / from an information device, and a gateway corresponding to the first wireless unit In a wireless network system comprising an information device having a second wireless unit for transmitting and receiving wireless signals, a plurality of the first wireless units and the second wireless units for transmitting and receiving wireless channel signals of mutually different frequencies Are respectively disposed in the gateway and the information device, and a pair of wireless units including the first wireless unit and the second wireless unit (hereinafter referred to as the first and second wireless units).
When transmitting and receiving a wideband data stream that exceeds the effective transmittable bandwidth of the wireless unit pair,
A plurality of pairs of the first and second wireless units are simultaneously assigned as wireless units for transmitting and receiving the wideband data stream, and the wideband data stream is allocated to a plurality of the first wireless units or the second wireless units. Distribution control means for performing control for dividing and distributing data packets to units (hereinafter, referred to as the first / second wireless units), and distributing the data packets in correspondence with the plurality of first / second wireless units. Assembling control means for receiving the data packets from the plurality of second wireless units or the first wireless units provided and assembling them into the original broadband data stream for each of the gateway and the information device. A wireless network system comprising:
2. The wireless network system according to claim 1, wherein the transmission / reception of the broadband data stream includes a specific one of a plurality of pairs of the first and second radio units that transmit and receive the data packet. First
Only one pair of the second wireless unit pair controls transmission of all the data packets as the main wireless unit pair, and the remaining plural pairs of the first and second wireless unit pairs are the main wireless unit pair. A wireless network system for performing the operation of transmitting and receiving the data packet according to transmission control of a unit pair.
3. The transmission buffer memory according to claim 1, wherein said data packet corresponding to an effective transmittable bandwidth of each of said first and second radio units is stored. Is provided in each of the first / second wireless units,
When there is a request to transmit the data packet exceeding the amount of data packets that can be stored in the buffer memory provided in the first / second wireless unit,
The data packet that cannot be completely stored in the buffer memory is transferred to and stored in a buffer memory provided in another of the first / second wireless units, and the other first packet is stored in the buffer memory.
/ A wireless network system having transmission packet storage means for controlling transmission from a second wireless unit.
4. The wireless network system according to claim 1, wherein a wireless signal constituting the wireless network system is IEEE 802.11.
b. A wireless network system which is compliant with the standard.
JP2000318816A 2000-10-19 2000-10-19 Wireless network system Expired - Fee Related JP3652233B2 (en)

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