JP3321319B2 - Wireless network communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless network communication system, and more particularly to a wireless system for realizing an environment in which a plurality of groups can simultaneously perform network communication on different wireless channels. For example, it is applied to indoor wireless communication and mobile communication.

[0002]

2. Description of the Related Art Known documents describing conventional network communication systems include, for example, Japanese Patent Laid-Open No. 6-2998.
No. 1 publication. The thing of this publication is a local area network for receiving a signal on a wireless transmission channel, including a receiving device for receiving a signal, and a transmitting device for transmitting a signal, wherein the receiving device receives the signal via a transmission channel. A high local area network (LAN) is provided by including a reception level determination device that indicates a signal level, a threshold level circuit device that provides a level instruction signal, and a transmission control device that controls the operation of the transmission device based on the level instruction signal. ) To achieve performance.

[0003] Japanese Patent Application Laid-Open No. 5-260051 discloses that in a network composed of a plurality of wireless terminals and a central station capable of transmitting and receiving all of them, the entire available frequency band is a message channel, a channel tone upstream, and a channel tone uplink. The present invention provides a wireless system that makes the central office have a role of a repeater by dividing the signal into three parts, that is, channel tone downlink, and that facilitates transmission and reception between terminals.

[0004]

According to the above-mentioned publication, the target wireless local area network (LAN) is a wired LAN widely used at present, and is used for connection between terminals. It aims to replace the cable with a wireless link. Also, Japanese Patent Laid-Open No. 6-29
No. 961 discloses an access method (C) for an Ethernet which is the most widely used wired LAN at present.
SMA), and is a peer-to-peer wireless LAN in which one terminal shares one wireless channel. Also, Japanese Patent Laid-Open No. 5-2
The wireless LAN described in Japanese Patent Application Laid-Open No. 60051 is a wireless LAN in which a central station is provided in addition to wireless terminals to control a wireless channel in order to improve communication throughput, and takes a communication form via the central station. The purpose of both is to realize the currently used wired LAN usage form wirelessly, and assumes network communication in a closed environment such as in an office.

However, in recent years, note-type personal computers (PCs) have been increasing, and in view of the fact that notebook-sized computers called portable information terminals have begun to be used, a plurality of these users are required to use these portable computers. It is thought that an environment (mobile network) in which networks can be established and communicated with each other regardless of where they are located will be required. This mobile network environment realizes, for example, a paperless meeting regardless of the location inside or outside the office.

[0006] In this mobile network, it is considered that there are many environments in which a plurality of groups of users are used contiguously, and the form of communication is frequently exchanged with data requiring real-time such as meetings. More and higher traffic. Therefore, in a wireless LAN in which one terminal shares one wireless channel as disclosed in Japanese Patent Laid-Open No. 6-29961, there is a problem that the throughput is obviously reduced. Also, Japanese Patent Application Laid-Open
In the wireless LAN disclosed in -260051, a repeater called a central office is required, so that there is a local limitation that a network can be configured only at a place where the central office is installed.

[0007] The present invention has been made in view of such circumstances, and provides a plurality of wireless channels with extremely small interference, and arbitrarily selects one wireless channel when configuring a network in a group to configure a network. And a method for selecting a radio channel required for a radio system realizing an environment in which a plurality of groups can simultaneously perform network communication on different radio channels, and a network communication by radio having a transmission method of the selected channel to each terminal in the group The aim is to provide a scheme.

[0008]

According to the present invention, in order to solve the above-mentioned problems, (1) a plurality of groups arbitrarily constituted by a plurality of wireless terminals are distributed equally among wireless terminals belonging to each group. A wireless network that performs network communication, when any group performs network communication, any wireless terminal belonging to the group senses a communication channel being used by another group to determine an empty channel, After selecting the communication channel to be used in the group, at least informing the selected communication channel to other wireless terminals belonging to the same group, and confirming the communication channel used by the other wireless terminals in the group, use the communication channel. Wireless network communication system configured to initiate peer-to-peer distributed network communication Communication channels used in each group are code-division multiplexed into each group by an individual spreading code, and communication within the same group senses the presence or absence of a spread signal spread spectrum by the individual spreading code, and Is a spreading code for controlling a communication channel common to the system for broadcasting the spreading code information used in the system and the group ID information using the spreading code. Providing a pilot code, causing a pilot signal obtained by multiplying a data signal relating to the information by a pilot code to be transmitted intermittently to a host terminal which is an arbitrary wireless terminal belonging to each group, and selecting a spreading code to be used in each group. And communicate the selection code to each member of the group And, further,
(2) A channel selection method using a pilot code for selecting an empty code after obtaining information on a used spreading code by despreading a pilot signal with the pilot code. (3) In the above (2), the spreading code selected by the host terminal and the group ID to which the host terminal belongs
A pilot signal obtained by spreading a data signal relating to the information of the above with a pilot code is transmitted. On the other hand, a member terminal which is a wireless terminal of a member of the group receives the pilot signal and performs despreading to correspond to the group ID and the group ID. A transmission method of a selection code for recognizing the selection code; and (4) in the above (3), after the host terminal selects a spread code, the host terminal waits for reception of the spread code. The terminal sends an ID unique to each member to Ack for announcing network communication participation.
The packet data signal is spread by using the selection code recognized by the above method and transmitted, and the host terminal uses the same code to transmit the A
After receiving the ck packet and confirming whether or not each member can participate in the network communication, perform multicast communication or broadcast communication by spread spectrum to each member of the group using the selected spreading code, and (5) (1) In the above (1), the host of each group has a pilot signal transmission system in which the pilot signal is periodically broadcast at a fixed time interval. Has a pilot signal transmission system in which the host broadcasts the pilot signal periodically at random time intervals.

[0009]

According to the wireless network communication system of the present invention having the above-described configuration, a plurality of groups arbitrarily configured by a plurality of wireless terminals are used in a wireless network in which wireless terminals belonging to each group perform peer-to-peer distributed network communication. When an arbitrary group performs network communication, any wireless terminal belonging to the group senses a communication channel being used by another group to determine a free channel, and determines a communication channel used by the group. After selecting as a channel, at least another wireless terminal belonging to the same group is notified of the selected communication channel, and after confirming the communication channel used by the other wireless terminal in the group, peer-to-peer distributed network communication is performed using the communication channel. In a wireless network communication system configured to start

(1) A communication channel used in each group is code-division multiplexed by a spreading code individual to each group, and communication within the same group depends on the presence or absence of a spread signal spread spectrum by the individual spreading code. And a communication system for transmitting the spread signal when the spread signal is not detected, the system common communication for broadcasting the spread code information used in the system and the group ID information using the spread code. Provision of a pilot code which is a spreading code for channel control, and causing a pilot signal obtained by multiplying a data signal relating to the information by a pilot code to be transmitted intermittently to a host terminal which is an arbitrary wireless terminal belonging to each group, Selection of spreading codes to be used in the group and selection of each member belonging to the group Since the transmission of over de, system configuration can be simplified by using the pilot code, which is a spreading code common in each group to transfer the radio channel selection.

(2) The host terminals in each of the other groups use the pilot code for selecting an empty code after obtaining information of the used spreading code by despreading the pilot signal with the pilot code. , A channel selection method using a pilot code is provided.
(3) A pilot signal obtained by spreading a data signal relating to the information of the spreading code selected by the host terminal and the group ID to which the host terminal belongs with a pilot code is transmitted, while the member terminal which is a wireless terminal of the group member transmits the pilot signal. Receive and despread to get group ID
And a selection code corresponding to the group ID, a channel transmission method to group members using a pilot code is provided.

(4) After the host terminal selects a spreading code, the host terminal waits for reception of the spreading code, while the member terminal sends the ID unique to each member to the Ack packet data signal for announcing participation in network communication. The host terminal receives the Ack packet with the same code, confirms whether or not each member can participate in the network communication, and then uses the selected spreading code to perform group transmission. Since multicast communication or broadcast communication by spread spectrum is performed for each member of the group, the reliability of a method of transmitting a channel to group members using a pilot code is increased.

(5) Since the pilot signal transmission system in which the hosts of each group periodically broadcast the pilot signal at a constant time interval, the pilot code detection time can be reduced when selecting a channel. (6) Since the pilot signal transmission system in which the hosts of each group periodically broadcast the pilot signal at random time intervals, it is difficult to detect the pilot code at the time of channel selection with the increase in the number of groups. It has been reduced.

[0014]

Embodiments will be described below with reference to the drawings. First, the invention described in claim 1 will be described.
FIG. 1 is a configuration diagram for explaining an embodiment of a wireless network communication system according to the present invention, and is a configuration diagram of a mobile network. In the figure, 1a to 1d are wireless terminals, 2a to 2d are wireless terminals, 3 is a wireless channel A, and 4 is a wireless channel B.

A mobile network is a communication system that forms a peer-to-peer distributed network at an arbitrary location by bringing a wireless terminal. In the example of FIG. 1, there are two groups (group 1 and group 2) forming a mobile network, and communication is performed between wireless terminals in each group. The two groups use different radio channels A and B for transmitting data packets.

The radio channels are required to have little interference (small correlation) with each other. In the present invention, however, a system is considered in which a spread code with low correlation is assigned to each radio channel and the radio channel is code-division multiplexed. ing.
In this case, when starting communication in each group, one spreading code must be selected from the plurality of prepared spreading codes in the group, and therefore, one wireless terminal in the group is connected to the host terminal. Select the spreading code to be used in the group as and transmit the selected code to the group members.

FIG. 2 is a flowchart for explaining a selection code transmission method according to the present invention. Hereinafter, description will be made in order according to each step (S). First, the spreading code of the wireless channel used by the host terminal is detected (S1).
Next, the host terminal selects a spreading code used in the group (S2). Next, information on the selected spreading code is transmitted to the terminal of the group member (transmission of the selected code) (S3). The spreading code used between the host terminal and the member terminal is confirmed (selection code is confirmed) (S4). next,
The selected spreading code is shared by the group members to start network communication (S5).

As shown in FIG. 2, the procedure up to the start of communication can be divided into "spreading code selection by host terminal", "transmission of selection code by host terminal", and "confirmation of selection code by member terminal". A first aspect of the present invention is a method in which a common spreading code (pilot code) is prepared for a communication system in order to use a wireless channel for performing each of the procedures and is used for transmitting and receiving necessary data.

FIG. 3 is a block diagram of a radio terminal for realizing the present invention. In FIG. 3, reference numeral 11 denotes a pilot code generator, 1
2 is a spreading code generator, 13 is a channel controller,
14 is a computer main body, 15 is a network controller, 16 is a transceiver, and 17 is an antenna.

The wireless terminal includes a transceiver 16 for performing spreading and despreading by a spreading code, modulation / demodulation of data packets, and transmission / reception of carriers, a spreading code generator 12 for supplying a selective spreading code to the transceiver 16, a pilot code. Pilot code generator 11 that supplies
And a network controller 15 that mediates transmission / reception data between the transceiver 16 and the computer main body 14 and controls peer-to-peer distributed network communication, outputs a pilot code, outputs a selected spreading code, a spreading code used by the transceiver 16, and transmission / reception thereof. And a channel controller 13 for controlling the All the terminals owned by the group members have a configuration as shown in FIG.

The host terminal intermittently transmits the group ID and the used spreading code information sent from the computer body 14 via the network controller 15 by using a pilot code. This transmission control is controlled by control signals from the channel controller 13 and the computer 14.

The data packet having the group ID and the information of the spreading code in use has, for example, a configuration as shown in FIG. Information about the spreading code in use next to the group ID data to which the host belongs is stored as data, and a header having information such as a packet preamble and an end delimiter indicating the end of the packet are respectively provided at the front and rear thereof. In addition. As shown in FIG. 5, the packet may include information on a plurality of groups. A new host terminal and a group member who want to start communication transmit and receive such a pilot code to form a network.

Next, the second aspect of the present invention will be described. FIG. 6 is a flowchart for explaining a channel selection method according to the present invention, and shows a channel selection procedure in the host terminal. Below, each step (S)
Will be described in order. First, a pilot signal from another group host is received (S11), and a despread data packet is demodulated with a pilot code (S12). Next, group ID data and spreading code data are fetched (S13), and it is determined whether or not the code detection period has ended (S14). If the code detection period has not expired,
The process returns to step S11. If the code detection period has expired, next, an empty code is confirmed (S15), and a selected code is determined (S16). Next, the data packet of the group ID and the selection code is assembled (S17), and the data packet is spread with the pilot code (S18). Next, a pilot signal is transmitted (S19).

That is, before the start of communication, the host terminal
Channel sensing by pilot code (code detection)
I do. Since the hosts of the other groups transmit the information of the group ID and the in-use spreading code with the same code (pilot code), the host terminal demodulates the data packet (S12). The code and the information of the group ID using the code are taken into the computer (S13). Other host terminals transmit the pilot code at any time, so the host terminal detects the pilot code for a certain period,
The group ID and the used code information are stored.

After the end of the detection period, an empty code is confirmed from the stored information, and a selected code is determined (S16). Further, a data packet similar to that described above (for example, FIG. 4) is configured with the own group ID and the information on the type of the selected spreading code (S17, 18), and transmitted as a pilot signal (S1).
9). In FIG. 3, the storage of the spreading code information and the selection of an empty code during use of another group are performed by the computer itself, but the channel controller may play the same role.

Next, the invention according to claim 3 will be described. FIG. 7 is a flowchart for explaining another embodiment of the selection code transmission method according to the present invention, and shows a procedure for recognizing the selection code in the member terminal. First,
A pilot signal from each host is received (S21) and despread with a pilot code (S22). Next, the data packet is demodulated (S23), and group ID data and spreading code data are captured (S24). Next, the group ID is collated (S25). If the ID does not match the own group ID, the process returns to the step S21. If the ID matches the own group ID, the selection code is confirmed (S26). Next, the used spreading code is set (S27).

After the spreading code is selected by the host terminal in the procedure as shown in FIG. 6, a pilot signal is broadcast from the host terminal, and the pilot signal is transmitted from other host terminals in the same manner. Then, the member terminal receives all the pilot signals (S21) and demodulates the data packet (S22, 23). As shown in FIG. 4, the data packet contains the group ID and information on the type of spreading code used in the group. (S2
Five). In this way, it is determined whether the received packet data is from another group or from its own group host terminal. When the ID does not match the own group ID, a control signal is output from the computer main body 14 to the channel controller 13, and the channel controller 13 controls the pilot code generator 11 and the transceiver 16 so as to keep the pilot signal receiving state.

When the group ID data obtained from the pilot signal thus received matches the own group ID, the type of the spreading code transmitted at the same time is recognized as the spreading code used in the group (S26).
Thereafter, a control signal is output from the computer main body 14 to the channel controller 13, which controls the pilot code generator 11 so that the supply of the pilot code to the transceiver 16 is stopped. 16 to control the spreading code generator 12. Further, it controls the transceiver 16 to enter the network communication start mode. In this manner, the selection code information is transmitted from the host terminal to the member terminals.

Next, the invention according to claim 4 will be described. According to the communication systems of claims 2 and 3, the spreading code used in the group is determined, and each wireless terminal is set to the transmission / reception mode using the determined spreading code. However, the transmission of the selection code is unilaterally performed from the host terminal to the member terminals, and it cannot be confirmed that the selection code information has been transmitted to all the member terminals of the group. Also, a wireless terminal of another group happens to be in group I.
If D is known, another group of terminals will enter network communication. In this embodiment, in order to solve such a problem, a communication procedure for transmitting an Ack packet for confirming a selection code from a member terminal is added.

FIG. 8 is a flow chart for explaining another embodiment of the wireless network communication system according to the present invention. Hereinafter, description will be made in order according to each step (S). First, a spreading code is determined in the host terminal (S31), and a pilot signal is transmitted (S32). Next, reception is waited for using the selected spreading code (S33). When the member terminal receives the pilot signal (S3
4) The selection code is confirmed (S35), and a data packet (Ack packet) of the group ID and the personal ID is assembled (S36). Next, the Ack packet is spread with the selection code (S37), and the Ack packet signal is transmitted (S38). The host terminal receives the Ack packet signal (S39),
Despread with the selected code and demodulate the data packet (S4
0). Next, the personal ID is collated (S41).

The host terminal enters the reception mode with the selected code together with the transmission of the pilot signal. By having two transceivers, transmission of a pilot signal (S32) and reception by a selection code can be performed simultaneously (S3
3) Since the pilot signal is transmitted intermittently even in the case of the configuration as shown in FIG. 3, the channel controller 13 sets the pilot mode in the transmission mode and the reception mode by the selection code when not transmitting. Can control the pilot code generator 11, the spreading code generator 12, and the transceiver 16.

After the member terminal confirms the selection code (S3
5) The group ID data and the individual ID data are assembled as a data packet having a configuration as shown in FIG. 9, for example (S36). Then, it spreads with a selection code (S37), and transmits via a transceiver (S38). The assembly of the packet is performed by the computer itself, but can also be performed by the channel controller.

The transmitted Ack packet is already handled in the procedure of peer-to-peer distributed network communication using the selection code, and the host terminal despreads and demodulates it with the selection code (S4).
0), extract the personal ID from the data packet. By comparing this personal ID with the group member ID information of the host, it is possible to know whether the wireless terminal of the group member has recognized the selection code or whether another group member is trying to receive the same selection code (S4).
1). Thereafter, when performing multicast communication, the host terminal broadcasts the personal ID list of the participating members again and transmits the list to the members, whereby network communication by multicast can be performed. In the case of broadcast communication, communication may be started without this procedure.

Next, the invention according to claim 5 will be described. FIG. 10 is a diagram illustrating a configuration example of a control signal generator included in the channel controller when controlling the channel controller. The pilot code is intermittently transmitted from the host terminal, and its control is performed by a control signal of the channel controller 13 or the computer main unit 14. In this case, the pilot code is transmitted periodically. The counter 21 counts clock pulses, and outputs a pulse when the number reaches a constant value N. The pulse resets the counter 21 and starts counting pulses again. By repeating this, a trigger signal as shown in FIGS. 11A and 11B is supplied to the pilot code generator 11. Pilot code generator 11
Generates a pilot code in response to the trigger signal, and transmits a pilot code (in this example, a pattern “1100101”) at regular time intervals as shown in FIG. As a result, a host terminal wishing to newly form a network can easily detect a pilot code signal.

Next, the invention according to claim 6 will be described. Claim 5 is an example in which the pilot code is transmitted at regular time intervals. However, if the pilot code is transmitted at regular time intervals, the probability of collision with a pilot signal transmitted from another host increases, and if the number of groups increases, the pilot code is transmitted. In some cases, the detected pilot signal may not be detected, which may make it difficult to form a network. In this way, claim 6 reduces the above-mentioned problem by making the transmission time interval of the pilot code pseudo-random.

FIG. 12 is a diagram showing a configuration example of a control signal generator included in the channel controller. As in the case of FIG. 10, the counter 21 counts N pulses,
After counting, pulses are output (FIGS. 13A to 13C).
This pulse is supplied as a clock pulse of the pseudo noise signal generator (PNG) 22. Here, PNG22
Can be composed of, for example, a feedback type shift register. In the examples of FIGS. 12 and 13, it is assumed that an M sequence (1100101) is generated. Since the PNG 22 outputs the pattern of the pseudo noise signal one bit at a time every time the CP enters, the PNG 22 outputs a pattern of 11001... With respect to the counter output as shown in FIG. As a result, a pulse train as shown in FIG. 13 is output from the AND gate output, and is supplied to the pilot code generator 11 as a trigger signal. As a result, the pilot code signal is transmitted at random time intervals according to the pattern of the pseudo noise signal.

[0037]

As is apparent from the above description, the present invention has the following effects. (1) Effects corresponding to claim 1: Communication channels used in each group are code-division multiplexed by spreading codes individual to each group, and communication within the same group is performed by:
In a communication system that senses the presence or absence of a spread signal that has been spread with the individual spreading code and transmits when the spread signal is not detected, information on the spreading code used in the system and the group using the spreading code A spreading code (pilot code) for communication channel control common to the system for broadcasting ID information is provided, and a pilot signal obtained by multiplying a data signal related to the above information by a pilot code is provided to an arbitrary radio belonging to each group. Since the terminal (host terminal) intermittently transmits and selects a spreading code to be used in each group and transmits a selection code to each member belonging to the group, a spreading code common to each group is used for wireless channel selection and transmission. (Pilot code) simplifies system configuration (2) Effects corresponding to claim 2: After the host terminals in the other groups obtain information on the used spreading code by despreading the pilot signal with the pilot code,
Since we used a pilot code to select an empty code,
A channel selection scheme using a pilot code is provided. (3) An effect corresponding to claim 3: a pilot signal obtained by spreading a data signal relating to the information of the spreading code selected by the host terminal and the group ID to which the host terminal belongs with a pilot code, while the wireless terminal of a member of the group is transmitted. Since the (member terminal) receives the pilot signal and performs despreading to recognize the group ID and the corresponding selection code, a channel transmission method to the group members using the pilot code is provided. (4) Effect according to claim 4: After the host terminal selects the spreading code, the host terminal waits for reception with the spreading code, while the member terminal assigns an ID unique to each member to the Ack for announcing participation in network communication. The packet data signal is spread using the selection code recognized by the above method and transmitted, and the host terminal receives the Ack packet with the same code, and checks whether each member can participate in the network communication, and then selects the spreading code. Since the multicast communication or the broadcast communication by the spread spectrum is performed to each member of the group using the code, the reliability of the channel transmission method to the group member using the pilot code is increased. (5) Effect corresponding to claim 5: Since the transmission method of the pilot signal is such that the hosts of each group periodically broadcast the pilot signal at a constant time interval, the detection time of the pilot code at the time of channel selection can be shortened. (6) Advantageous effect according to claim 6: Since the transmission method of the pilot signal is such that the hosts of each group periodically broadcast the pilot signal at random time intervals,
This makes it difficult to detect a pilot code during channel selection as the number of groups increases.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating a selection code transmission method according to the present invention.

FIG. 3 is a configuration diagram of a wireless terminal for implementing the present invention.

FIG. 4 is a configuration diagram of a data packet in the present invention.

FIG. 5 is a configuration diagram of another data packet in the present invention.

FIG. 6 is a flowchart illustrating a channel selection method according to the present invention.

FIG. 7 is another flowchart for explaining a selection code transmission method according to the present invention.

FIG. 8 is a flowchart for explaining another embodiment of a wireless network communication system according to the present invention.

FIG. 9 is a configuration diagram of another data packet in the present invention.

FIG. 10 is a diagram illustrating a configuration example of a control signal generator included in a channel controller according to the present invention.

FIG. 11 is a diagram showing signals in FIG.

FIG. 12 is a diagram illustrating a configuration example of another control signal generator included in a channel controller according to the present invention.

FIG. 13 is a diagram showing signals in FIG.

[Explanation of symbols]

1a-1d wireless terminal, 2a-2d wireless terminal, 3 wireless channel A, 4 wireless channel B, 11 pilot code generator, 12 spreading code generator, 13 channel controller, 14 computer body, 15: Network controller, 16: Transceiver, 17: Antenna.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Harumi Kokaji 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) References JP-A-6-326685 (JP, A) JP-A-Hei JP-A-1-138734 (JP, A) JP-A-8-97827 (JP, A) JP-A-8-125655 (JP, A) JP-A-8-125662 (JP, A) JP-A-8-125656 (JP, A) A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04L 12/28 H04B 1/707

Claims (6)

(57) [Claims] 1. A plurality of groups arbitrarily configured by a plurality of wireless terminals are wireless networks in which wireless terminals belonging to each group perform peer-to-peer distributed network communication, and an arbitrary group performs network communication. At this time, any one of the wireless terminals belonging to the group senses a communication channel in use by another group to determine an empty channel, and selects as a communication channel to be used in the group, and then selects at least another wireless terminal belonging to the same group. After informing the wireless terminal of the selected communication channel and confirming the communication channels used by other wireless terminals in the group,
In a wireless network communication system configured to start peer-to-peer distributed network communication using the communication channel, communication channels used in each group are code-division multiplexed by a spreading code individual to each group. Is a communication system that senses the presence or absence of a spread signal that has been spread with the individual spreading code and transmits when the spread signal is not detected, wherein the spreading code information used in the system and the spreading code A pilot code, which is a spreading code for controlling a communication channel common to a system for broadcasting group ID information using, is provided, and a pilot signal obtained by multiplying a data signal related to the information by a pilot code belongs to each group. To the host terminal, which is any wireless terminal that Manner is transmitted, the radio by the network communication method which is characterized in that the transmission of selection codes to each member belonging to the selected and the group of spreading codes used in each group. 2. The host terminal of each of the other groups obtains information on a used spreading code by despreading a pilot signal with the pilot code, and then selects a channel using a pilot code for selecting an empty code. 2. The wireless network communication method according to claim 1, further comprising a selection method. 3. A pilot signal obtained by spreading, with a pilot code, a data signal relating to information on a spreading code selected by a host terminal and a group ID to which the host terminal belongs, while a member terminal which is a wireless terminal of a group member transmits a pilot signal. 3. The wireless network communication system according to claim 2, further comprising a group ID and a selection code transmission method for recognizing a selection code corresponding to the group ID by receiving and despreading a signal. 4. After the host terminal selects a spreading code, the host terminal waits for reception of the spreading code, while the member terminal transmits an Ack packet data signal for indicating network communication participation to each member's unique ID. The host terminal receives the Ack packet with the same code, confirms whether or not each member can participate in the network communication, and then uses the selected spreading code to perform group transmission. 4. The wireless network communication system according to claim 3, wherein multicast communication or broadcast communication by spread spectrum is performed to each member of the above. 5. The wireless network communication system according to claim 1, wherein each group of hosts has a pilot signal transmission system in which a pilot signal is broadcast at regular time intervals. 6. The wireless network communication system according to claim 1, further comprising a pilot signal transmission system in which each group of hosts broadcasts the pilot signal periodically at random time intervals.