JP2003289309A - Wireless communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication terminal adaptive to the transmission of data having a real time property even on an ad hoc network with no centralized administrative station in a wireless packet communication system. <P>SOLUTION: In a media access control part 104 of the wireless packet communication system, a block to use a CSMA/CA scheme as an access scheme and a block to use a token passing scheme are provided and in the case of data requiring the real time property, the data are transmitted by using the token passing scheme. Thus, the delay of the data is reduced. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication terminal device for communicating data between a plurality of wireless terminals.

[0002]

2. Description of the Related Art Conventionally, regarding a wireless packet communication system composed of a plurality of terminals, for example, IEEE S
Data transmission method (Carrier Sense Multip) described in Td 802.11-1997.
le Access with Collision A
Voidance: CSMA / CA) is used. In this method, the transmitting terminal performs carrier sense,
If the carrier is free for a certain period of time, wait for another random time, then if the carrier is free,
The application data generated and used by the Operation System (hereinafter referred to as OS) unit is transmitted, and if the carrier is busy, it waits for a random time. This prevents transmission from being concentrated and avoids collisions. The receiving terminal receives a response frame (hereinafter, ACKnowledgemen) after a fixed time after receiving the application data addressed to itself.
t: described as Ack) is transmitted to the transmission terminal. The transmitting terminal determines that the transmission has succeeded by receiving the Ack, determines that the transmission has failed if the Ack is not received, and transmits the same application data again.

In addition, IEEE Std 802.11-
In 1997, a data transmission method using polling as an option (hereinafter referred to as PCF) is specified. In this method, an access point (hereinafter referred to as an AP) polls each PCF-compatible terminal.
A terminal that transmits a frame and receives a Poll frame can transmit data if its destination is its own station. As a result, data can be transmitted and received without causing a collision, so that a delay in immediate data transmission such as a moving image controlled by a protocol (Real Time Protocol: RTP) that requires real-time processing can be suppressed to be small.

[0004]

In the conventional wireless packet communication system, a polling method is used as an access method in order to efficiently transmit real-time immediate data. However, in an ad hoc network that does not have a central control station such as AP, it is difficult to provide a service using immediate data because the polling method cannot be used.

Therefore, the present invention is for solving the above-mentioned problems, and makes data stored with information for identifying a terminal such as a terminal number called a token circulate between terminals constituting an ad hoc network. , The terminal information stored in the token matches the information of the own terminal, and the RTP
By using the token passing method that performs transmission when there is immediate data controlled by
An object is to provide a service using immediate data even in an ad hoc wireless packet communication system without an AP.

[0006]

According to the present invention, CSMA / CA is used as an access method in a wireless communication terminal device.
The above object is achieved by providing a section using the method and the token passing method.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention inputs an antenna section for receiving a high frequency signal and the high frequency signal received by the antenna section, and converts the high frequency signal into a baseband signal. And an RF unit for inputting the baseband signal of the RF unit to demodulate the baseband signal into a digital signal, and a digital signal of the modulator / demodulator for inputting a terminal included in the digital signal. A media access control unit that acquires terminal information to be managed, and the digital signal of the media access control unit are input, and the terminal information and application data included in the digital signal are processed.
A wireless communication terminal device comprising an S unit, wherein the OS unit creates the application data, and adds the digital signal in which the terminal information and access control information for controlling an access method are added to the application data. Output to the access control unit, the media access control unit determines the access scheme from the access control information, outputs the digital signal to the modulation / demodulation unit according to the access scheme, and the modulation / demodulation unit performs the media access control. The digital signal input from the unit is converted into a modulated signal by a predetermined modulation method,
The RF unit converts the modulated signal into the high frequency signal, and the antenna unit serves as a wireless communication terminal device that transmits the high frequency signal. It has the effect of ensuring transmission efficiency.

According to a second aspect of the present invention, the medium access control unit controls the CSMA / CA method for carrying out carrier sense to avoid transmission collision, and outputs a digital signal to the modulation / demodulation unit. The control unit and the token storing the terminal number of the terminal that constitutes the ad hoc network permitted to transmit are circulated between the terminals constituting the ad hoc network, and the terminal that matches the terminal number transmits the token. A token passing control unit that controls a passing system and outputs the digital signal to the modulation / demodulation unit, and access control information of the digital signal input from the OS unit is monitored to determine an access system and a duration time. Outputs the digital signal to the token passing controller and the CSMA / CA controller. The token passing start packet for declaring the start of the token passing method input from the modulator / demodulator, the token, the signal for performing the carrier sense, and the digital signal received from the terminal configuring the ad hoc network are determined, and The token passing start packet and the token are output to the token passing control unit, the signal for performing the carrier sense is output to the CSMA / CA control unit, and the digital signal received from the terminal forming the ad hoc network is output. An access method control unit that outputs to the OS unit, a terminal management unit that stores terminal information that constitutes the ad hoc network, and outputs the terminal information to the CSMA / CA control unit and the token passing control unit. Item 1 description Is obtained by the radio communication terminal device by using a token passing scheme as an access scheme, also possible to reduce the delay of the instant system the data in the absence of the access point wireless packet communication system, a token passing scheme and CS
By adjusting the section using the MA / CA method, there is an effect of ensuring high transmission efficiency.

According to a third aspect of the present invention, the media access control unit generates a join request signal to be transmitted to another terminal forming the ad hoc network when a new communication is started, and CSMA / CA The access method control unit further includes a join request signal generation unit for outputting to the control unit.
A signal requesting generation of the join request signal input from the S section is output to the join request signal generating section, and the join request signal received from another terminal configuring the ad hoc network, which is input from the modulation / demodulation section, The terminal information is output to the terminal management unit, and the terminal management unit updates the subscription request signal input from the access method control unit to the terminal information and outputs the terminal information to the CSMA / CA control unit or the token passing control unit. The wireless communication terminal device according to claim 2, wherein the same terminal information is retained and centralized by communicating terminal information newly subscribed to all terminals in the ad hoc network by the CSMA / CA method. Even in an ad hoc network where there is no management station, it has the effect of enabling stable communication.

According to a fourth aspect of the present invention, in the communication area, the media access control unit uses the digital signal received from another terminal which constitutes the ad hoc network and the terminal information stored in the terminal management unit. Further includes a hidden terminal monitoring unit that determines a hidden terminal located outside the device and outputs information of the hidden terminal to the terminal management unit, and the terminal management unit configures the ad hoc network input from the modulation / demodulation unit. The wireless communication terminal device according to claim 2 or 3, wherein the access method control unit that outputs the digital signal received from another terminal to the hidden terminal monitoring unit and the terminal information is output to the hidden terminal monitoring unit. That is, it has an effect of determining a hidden terminal that belongs to the same ad hoc network but exists outside the communication area of the own terminal.

According to a fifth aspect of the present invention, the media access control unit generates a relay request signal for requesting relay of communication data with the hidden terminal from information of the hidden terminal stored in the terminal management unit. However, the access method control unit further includes a relay request signal generation unit that outputs the relay request signal to which the relay request signal generated by another terminal configuring the ad hoc network is added, to the terminal management unit Determining the relay request signal generated by another terminal constituting the ad hoc network input from the unit,
The wireless communication terminal device according to claim 4, which outputs the signal to the relay request signal generation unit, wherein the hidden terminal problem can be avoided by relaying communication with the hidden terminal using a plurality of terminals. Have.

According to a sixth aspect of the present invention, the media access control unit generates a communication area signal describing a condition for changing the communication area from the information of the hidden terminal stored in the terminal management unit, The access method control further includes a communication area signal generation unit that outputs the communication area signal, which is added to the communication area signal generated by another terminal configuring the ad hoc network and is input to the modulation / demodulation unit, to the terminal management unit. 5. The wireless communication terminal device according to claim 4, wherein the unit determines the communication area signal generated by another terminal that constitutes the ad hoc network, which is input from the modulation / demodulation unit, and outputs the communication area signal to the communication area signal generation unit. It avoids the hidden terminal problem by expanding the communication area when there are hidden terminals, and narrows the communication area when terminals are close together, It has the effect of reducing the cost of power.

FIG. 1 shows an embodiment of the present invention.
From now on, description will be made with reference to FIG.

(Embodiment 1) FIG. 1 is a diagram showing a configuration of a radio communication terminal apparatus according to a first embodiment of the present invention, which includes an antenna section 101, an RF section 102, and a modulation / demodulation section 10.
3, a media access control unit 104 and an OS unit 105. The operation will be described below.

First, the process of receiving data will be described.
The antenna unit 101 receives the high frequency signal, and the RF unit 102
Output to. The RF unit 102 converts the high frequency signal into a baseband signal and outputs the baseband signal to the modulation / demodulation unit 103. The modulation / demodulation unit 103 converts the baseband signal into a digital signal and outputs the digital signal to the media access control unit 104. The media access control unit 104 acquires access control information for controlling the access method from the digital signal and outputs the digital signal to the OS unit 105. Here, the access control information includes a protocol such as RTP, a terminal number that identifies the terminal of the transmission source, and a terminal number that identifies the terminal that is the destination.

The OS section 105 acquires information on the transmitting terminal and the receiving terminal from the terminal information contained in the digital signal. Here, when the specific terminal is requested to transmit the application data included in the digital signal, the terminal numbers of the transmitting terminal and the receiving terminal are authenticated, and the application data is processed after the terminal numbers are correctly authenticated. . When the application data includes data such as a moving image, it is reproduced by a moving image reproducing program. When the application data is not requested to the specific terminal, the application data is used after confirming that the terminal number of the receiving terminal is the own terminal.

Next, the data transmission process will be described.
The OS unit 105 creates application data to be transmitted, and outputs a digital signal in which the terminal number of the transmitting terminal, that is, its own terminal, the terminal number of the receiving terminal that is the transmission destination, and access control information for controlling the access method are added to the application data. Output to the media access control unit 104. If the protocol included in the access control information is RTP, the media access control unit 104 preferentially outputs it to the modulation / demodulation unit 103 using an access method with a small delay, and then outputs a digital signal whose protocol is not RTP to the modulation / demodulation unit 103. Output to. The modulation / demodulation unit 103 converts the digital signal input from the media access control unit 104 into a modulation signal by a predetermined modulation scheme, for example, a QPSK modulation scheme, and outputs the modulated signal to the RF unit 102.
The RF unit 102 converts the modulated signal into a high frequency signal and transmits it from the antenna unit 101.

FIG. 2 shows the configuration of the media access control unit 104. The CSMA / CA control unit 201 that controls the CSMA / CA system that performs carrier sense to avoid transmission collision and outputs a digital signal to the modulation / demodulation unit 103, and the terminal number of a terminal that constitutes an ad hoc network that is permitted to transmit are The token passing control unit that circulates the stored tokens among the terminals that configure the ad hoc network, controls the token passing method in which the terminal having the same terminal number transmits, and outputs the digital signal to the modulation / demodulation unit 103. 202 and the access control information of the digital signal input from the OS unit 105 are monitored to determine the access method and duration, and the token passing control unit 202 and the CSMA / CA control unit 201.
A token passing start packet 304 for declaring the start of the token passing method input from the modulator / demodulator 103, a token, a signal for performing carrier sense, and a digital signal received from a terminal forming an ad hoc network. Judgment, the token passing start packet 304 and the token are output to the token passing control unit 202, and the signal for performing carrier sense is output to the CSMA / CA control unit 201.
A digital signal received from a terminal forming an ad hoc network is stored in an access method control unit 203 which outputs to an OS unit 105 and terminal information forming an ad hoc network, and is stored in a CSMA / CA control unit 201 and a token passing control unit 202. It is composed of a terminal management unit 204 which outputs terminal information. The operation will be described below.

Token passing method and CSMA / C
The A method operates alternately and repeatedly at a constant cycle. This cycle is called a token passing start cycle 303. FIG. 3 shows the token passing control unit 202 and the CSMA / C.
The operation state of the A control unit 201 is shown.

First, the token passing start packet 30 for instructing the start of the token passing section 301.
4 is output from the token passing control unit 202 and transmitted via the modulation / demodulation unit 103, the RF unit 102, and the antenna unit 101.

The token passing start period 303 is
Considering the communication delay, which is a common cycle for terminals that make up an ad hoc network and requires immediate data,
The delay time is determined to be the minimum. The token passing start packet 304 is transmitted to all the terminals stored in the terminal management unit 204 by the token passing control unit 202 of one terminal selected from the terminals forming the ad hoc network. Here, the terminal selection method is determined from the terminal information stored in the terminal management unit 204. For example, the terminal having the smallest terminal number may be used.

Next, the terminal receiving the token passing start packet 304 determines the token passing start packet 304 in the access method control unit 203 and outputs it to the token passing control unit 202. At this point, the terminal holding the token updates the number of the terminal that can transmit next to the token and releases it. The terminal that receives the updated token is the access method control unit 2
03 determines the token and outputs it to the token passing control unit 202. Token passing control unit 202
Holds the token when its own terminal number matches the terminal number stored in the token.

If a digital signal produced by the OS section 105 exists, the protocol is discriminated by referring to the access control information. If the protocol is RTP, the modulator / demodulator 1
Output to 03. The token passing control unit 202 of the terminal that has completed the output of the digital signal is the terminal management unit 2
The terminal information of No. 04 is referred to, the number of the next terminal that can be transmitted is instructed to the token, and the token is released.

The digital signal protocol is RT
When it is not P or when there is no digital signal to be transmitted, the token is immediately instructed to the number of the terminal that can transmit next, and the token is released. This operation is repeated during the token passing section 301. When the token passing section 301 ends, and when it is determined that all the terminals in which the token is recorded in the terminal management unit 204 is set a preset number of times, for example, one round of the terminals stored in the terminal management unit 204 is determined. , The terminal having the last terminal number holds the token. However, when the token passing section 301 is exceeded during the transmission of the digital signal, the terminal which was transmitting at the time when the token passing section 301 is exceeded holds the token.

Next, the CSMA / CA section 302 is reached,
Communication by the CSMA / CA method using carrier sense is performed. Communication that does not require real-timeness is continued until the next token passing section 301 is started.

Further, in the access method control unit 203, the digital signal input from the OS unit 105 is monitored, and when the digital signal for which real-time property is desired is continuous, the duration time of the token passing section 301 is CSMA / CA controlled. If the digital signal that does not require real-time property is extended by the time when the unit 201 completes one or more transmission / reception, the duration of the token passing section 301 is shortened until the token is opened to the next terminal. As a result, stable operation can be obtained even when a large amount of digital signals are produced by the OS unit 105 and the system load is high.

The terminal transmitting the token passing start packet 304 does not have to be the terminal having the smallest terminal number in the terminal information stored in the terminal management unit 204, and the terminal holding the token It may be sent.

With the above structure, high transmission efficiency can be secured by transmitting data requiring real-time property with a small delay.

Next, the operation when the terminal newly joins the ad hoc network will be described. FIG. 4 shows that when a new communication is started, a join request signal to be transmitted to another terminal which constitutes the ad hoc network is generated,
Join request signal generator 4 for outputting to A / CA controller 201
01 and a signal requesting the generation of the join request signal input from the OS unit 105 to the join request signal generation unit 401, and the join request received from the other terminal configuring the ad hoc network input from the modulation / demodulation unit 103. An access method control unit 203 that outputs signals and terminal information to the terminal management unit 204, and a subscription request signal input from the access method control unit 203 is updated to terminal information, and the CSMA / CA control unit 201 and the token passing control unit are updated. Media access control unit 1 including terminal management unit 204 for outputting to 202
04, and other operations are the same as those of the media access control unit 104 shown in FIG.

A terminal wishing to newly join the ad hoc network stores the terminal information in the joining request signal,
CSMA / C is used as the terminal that constitutes the ad hoc network.
Output from the A control unit 201 to the modulation / demodulation unit 103. CSM
Since the A / CA method can perform transmission when the carrier is determined to be free by carrier sense, even if the terminal is not described in the terminal information of the terminal management unit 204, the subscription request signal Transmission is possible. In the terminal that constitutes the ad hoc network that has received the join request signal, the access method control unit 203 determines the join request signal and outputs it to the terminal management unit 204. The terminal management unit 204 adds the information of the terminal newly joined from the subscription request signal to the terminal information and outputs it to the CSMA / CA control unit 201 or the token passing control unit 202. The CSMA / CA control unit 201 controls the modulation / demodulation unit 103 when the carrier becomes free.
Output to. Also, the token passing control unit 202
Adds RTP to the terminal information and outputs it to the modulation / demodulation unit 103 when the token circulates. As a result, the information of the terminal newly joined to the other terminals forming the ad hoc network is updated, and the same terminal information is held in all the terminals.

When a terminal compatible with token passing first joins the ad hoc network,
Regarding the operation when a new token is issued, the terminal that supports token passing monitors the channel for a certain period of time and confirms that the token is not flowing on the ad hoc network. After that, a new token is issued.

Next, the operation when there is a terminal that is a hidden terminal in the ad hoc network will be described. FIG. 5 shows the configuration of the media access control unit 104 that detects a hidden terminal. Media access control unit 104
Determines a hidden terminal located outside the communication area by using a digital signal received from another terminal forming the ad hoc network and the terminal information stored in the terminal management unit 204, and manages the information of the hidden terminal by the terminal management. The hidden terminal monitoring unit 501 that outputs to the unit 204, the access method control unit 203 that outputs the digital signal received from the other terminal configuring the ad hoc network input from the modulation / demodulation unit 103 to the hidden terminal monitoring unit 501, and the hidden terminal monitoring Part 501
The operation of the hidden terminal monitoring unit 501 will be described in particular, including the terminal management unit 204 that outputs terminal information.

The hidden terminal monitoring section 501 is a modulation / demodulation section 10 that receives from another terminal that constitutes an ad hoc network.
The digital signal demodulated in 3 is monitored, and the terminal management unit 2
The terminal information of No. 04 is referred to, and the terminal in which the information of the terminal is described but the digital signal is not received is determined. For example, the terminal that does not receive a signal for one cycle of the token passing start cycle 303 and the own terminal are determined to be in a hidden terminal relationship, and the information of the hidden terminal is output to the terminal management unit 204. The terminal management unit 204 outputs the terminal information from the CSMA / CA control unit 201 and the token passing control unit 202 to the modulation / demodulation unit 103, so that the information of the hidden terminal can be shared with other terminals that configure the ad hoc network. .

As a specific example, a series of operations in the case of the ad hoc network configuration as shown in FIG. 5 will be described.

As shown in FIG. 5, terminal A 601 and terminal D
Since the communication area of 604 partially overlaps, the terminal information becomes the same via the terminal C603. First, since the terminal A 601 monitors the received digital signal for a certain period and does not receive the digital signal whose source is the terminal D 604 registered in the terminal information, the terminal A 601 has a hidden terminal relationship with the terminal D 604. The terminal information of the terminal management unit 204 is updated and the terminal B60 existing in the communication area of the terminal A601 is determined.
2, the terminal information of the terminal management unit 204 is transmitted to the terminal C603 and the terminal E605, and the information of the hidden terminal D604 is shared.

Next, the communication method with the hidden terminal is shown in FIG.
Will be explained. FIG. 7 is a diagram illustrating a relay request signal generated by another terminal included in the ad hoc network that generates a relay request signal for requesting relay of communication data with the hidden terminal from information on the hidden terminal stored in the terminal management unit 204. The relay request signal generation unit 701 that outputs the relay request signal to which the signal is added to the terminal management unit 204 and the relay request signal that is input from the modulation / demodulation unit 103 and that is generated by the other terminal configuring the ad hoc network are determined and relayed. Request signal generator 7
The operation of the relay request signal generation unit 701, which is the media access control unit 104 including the access method control unit 203 for outputting to 01, will be described.

The relay request signal generation unit 701 recognizes the hidden terminal from the terminal information of the terminal management unit 204, and outputs a relay request signal for relaying communication with the hidden terminal to the terminal management unit 204. The terminal management unit 204 adds the relay information to the terminal information and shares the information with other terminals in order to share the information with the CSMA / CA.
It is output to the control unit 201 and the token passing control unit 202. Here, when the terminal information is received, the hidden terminal information stored in the terminal information is confirmed, and when the own terminal is not designated as the hidden terminal, the information of the own terminal is added to the relay information, and other information is added. Send to the terminal. When the own terminal is designated as a hidden terminal, the route for transmitting data is determined based on the relay information.

The case of FIG. 6 will be specifically described. Here, the terminal D604 becomes a hidden terminal in the terminal A601, and the terminal C603 executes the relay, whereby the shortest route can be taken. When terminal A 601 transmits a relay request signal requesting relay with terminal D 604, terminal B 6
02, the terminal C603, and the terminal E605. Here, the terminal C603 selects the hidden terminal from the terminal information as the terminal D60.
Recognize as 4. The terminal C603 determines that it is not a hidden terminal, updates the "terminal A601, terminal C603" as the relay route in the relay information, and transmits the relay information. Since the terminal A601 and the terminal D604 receive the terminal information of the terminal C603, and the terminal A601 is not a hidden terminal, the relay route is updated to "terminal A601, terminal C603, terminal A601", and the terminal D604 hides itself. In order to recognize the terminal as a terminal, the relay route is defined as “terminal A601, terminal C603, terminal D”.
604 ”, and terminal A601 to terminal D60 requesting relay
Establish a route to 4.

Data can be relayed in multiple stages. If there are a plurality of relay routes, the one with the smallest number of relays is selected. For example, the latter is selected in the route of “terminal A601, terminal B602, terminal C603, terminal D604” and “terminal A601, terminal C603, terminal D604”. However, as the relay route, the route of “terminal A601, terminal B602, terminal C603, terminal D604” can be selected in consideration of the communication state.

When the terminal moves out of the ad hoc network due to movement or power off, the terminal is registered as a hidden terminal, and if the received signal and the relay request signal do not exist even after a certain period of time, the hidden terminal is hidden. The terminal determines that it has left the ad hoc network,
Delete the corresponding terminal information.

With the above configuration, data can be transmitted / received in the ad hoc network even when a hidden terminal exists.

(Embodiment 2) FIG. 8 shows a media access control unit 104 for changing the communication area according to the destination terminal in the second embodiment of the present invention.

FIG. 8 shows the configuration of an ad hoc network which generates a communication area signal describing the conditions for changing the communication area from the information of the hidden terminal stored in the terminal management section 204 and inputs it to the modulation / demodulation section 103. The communication area signal added with the communication area signal generated by the terminal
04, and the access method control for determining the communication area signal generated by the communication area signal generation unit 801 that is output from the modulation / demodulation unit 103 and another terminal that is included in the ad hoc network and that is output to the communication area signal generation unit 801. Part 20
The communication area signal generation unit 801 is the media access control unit 104 including H.3, and particularly the communication area signal generation unit 801.

The communication area signal generation unit 801 recognizes the hidden terminal from the terminal information of the terminal management unit 204, and uses the communication area signal regarding the communication area in which the communication area of the own terminal is indicated by the transmission power as the terminal information of the terminal management unit 204. to add. The terminal information added with the communication area signal is output to the CSMA / CA control section 201 and the token passing control section 202, the transmission power of the antenna section 101 is changed based on the communication area signal, and the information is transmitted to the hidden terminal. To be done. Here, when the hidden terminal receives the terminal information including the communication area signal, the terminal information of the terminal management unit 204 of the hidden terminal is updated, and the transmission signal of the communication area signal is used as the transmission source of the response signal. Reply. However, when the transmission source terminal does not receive the response signal from the hidden terminal for a certain period of time, the transmission power is further increased to perform the above operation. These operations are repeated until the transmission power reaches the upper limit value that is predetermined in product planning.

The relay method described in the first embodiment of the present invention can be used at the same time. For example, when there are a plurality of relay stages, it is possible to reduce the number of relay stages by increasing the transmission power.

The same effect can be obtained by adjusting the directivity of the antenna beam in the method of changing the communication area.

When the terminal to be communicated is not a hidden terminal, it is possible to reduce the transmission power, reduce the communication area, and reduce the power consumption.

When the terminal moves out of the ad hoc network due to movement or power off, the terminal is registered as a hidden terminal, and if there is no received signal or relay request signal even after a certain period of time, the hidden terminal is hidden. The terminal determines that it has left the ad hoc network,
Delete the corresponding terminal information.

[0049]

As described above, the effects of the present invention are as follows.
Even in an ad hoc network that is a wireless packet communication system and does not have a central control station such as an access point, the delay time of data can be suppressed to a small value by using the token passing method and the CSMA / CA method together, so that the real time is realized. It is possible to build an ad hoc network that also supports data transmission that requires reliability.

[Brief description of drawings]

FIG. 1 is a diagram showing a wireless communication terminal device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a media access control unit of the wireless communication terminal device according to the first embodiment.

FIG. 3 is a diagram showing a change over time in an access method of the media access control unit according to the first embodiment.

FIG. 4 is a diagram showing a media access control unit of the wireless communication terminal device according to the first embodiment.

FIG. 5 is a diagram showing a media access control unit of the wireless communication terminal device according to the first embodiment.

FIG. 6 is a diagram showing an ad hoc network when a hidden terminal exists according to the first embodiment.

FIG. 7 is a diagram showing a media access control unit of the wireless communication terminal device according to the first embodiment.

FIG. 8 is a diagram showing a media access control unit of the wireless communication terminal device according to the second embodiment.

[Explanation of symbols]

101 antenna 102 RF section 103 modem unit 104 media access control unit 105 OS part 201 CSMA / CA control unit 202 Token passing controller 203 access method control unit 204 terminal management unit 301 token passing section 302 CSMA / CA section 303 Token passing start cycle 304 token passing start packet 401 subscription request signal generator 501 hidden terminal monitoring unit 601 Terminal A 602 Terminal B 603 Terminal C 604 Terminal D 605 Terminal E 701 Relay request signal generator 801 Communication area signal generation unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Taisuke Matsumoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Hirokazu Kobayashi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5K033 CA07 CA15 DA17 DB09 EA03                       EC02

Claims (6)

[Claims] 1. An antenna unit for receiving a high-frequency signal, an RF unit for inputting the high-frequency signal received by the antenna unit and converting the high-frequency signal into a baseband signal, and the baseband signal for the RF unit. A modulator / demodulator for inputting and demodulating the baseband signal into a digital signal; a media access controller for inputting the digital signal of the modulator / demodulator and acquiring terminal information for managing a terminal included in the digital signal; A wireless communication terminal device comprising an OS unit for inputting the digital signal of a media access control unit and processing the terminal information and application data included in the digital signal,
The OS section creates the application data,
The digital signal in which access control information for controlling the terminal information and the access method is added to the application data is output to the media access control unit, and the media access control unit determines the access method from the access control information. Outputting the digital signal to the modulation / demodulation unit according to the access method, the modulation / demodulation unit converting the digital signal input from the media access control unit into a modulation signal by a predetermined modulation method, and the RF unit. Is a radio communication terminal device that converts the modulated signal into the high frequency signal, and the antenna unit transmits the high frequency signal. 2. A CSMA that controls a CSMA / CA system in which a media access control unit carries out carrier sense and avoids collision of transmission, and outputs a digital signal to a modulation / demodulation unit.
/ CA control unit and a token storing the terminal number of the terminal forming the ad hoc network permitted to be transmitted are circulated between the terminals forming the ad hoc network, and the terminal matching the terminal number transmits. A token passing control unit that controls the token passing system and outputs the digital signal to the modem unit;
Monitoring the access control information of the digital signal input from the OS unit, determining the access method and duration,
The token passing controller and the CSMA / C
A token-passing start packet for outputting the digital signal to the A control unit and declaring the start of the token-passing method input from the modulation / demodulation unit, the token, the signal for performing the carrier sense, and the terminal configuring the ad hoc network The digital signal received from the CSM is determined, the token passing start packet and the token are output to the token passing control unit, and the signal for performing the carrier sense is output to the CSM.
An access method control unit that outputs to the OS unit the digital signal that is output to the A / CA control unit and that is received from the terminal that configures the ad hoc network; and information about the terminal that configures the ad hoc network, stores the CS
The MA / CA control unit and the token passing control unit include a terminal management unit that outputs the terminal information.
The wireless communication terminal device described. 3. A media access control unit generates a join request signal to be transmitted to another terminal which constitutes an ad hoc network when newly starting communication, and CSMA / CA
The access method control unit further includes a join request signal generation unit for outputting to the control unit, and the access method control unit outputs a signal requesting the generation of the join request signal input from the OS unit to the join request signal generation unit, and the modulation / demodulation unit. Output the join request signal and terminal information received from another terminal configuring the ad hoc network to the terminal management unit, and the terminal management unit receives the join request signal input from the access method control unit. Is updated to the terminal information and is output to the CSMA / CA control unit or the token passing control unit. 4. The media access control unit determines a hidden terminal located outside the communication area by using a digital signal received from another terminal forming the ad hoc network and the terminal information stored in the terminal management unit. , Further includes a hidden terminal monitoring unit for outputting information of the hidden terminal to the terminal management unit, the terminal management unit, the digital signal received from another terminal constituting the ad hoc network input from the modulation and demodulation unit The wireless communication terminal device according to claim 2 or 3, wherein the access method control unit that outputs the information to the hidden terminal monitoring unit and the terminal information that is output to the hidden terminal monitoring unit. 5. The other terminal constituting the ad hoc network, wherein the media access control unit generates a relay request signal for requesting relay of communication data with the hidden terminal from the information of the hidden terminal stored in the terminal management unit. The relay system further comprises a relay request signal generation section that outputs the relay request signal to which the relay request signal generated in step 1 is added to the terminal management section, and the access method control section configures the ad hoc network input from the modulation / demodulation section. The wireless communication terminal device according to claim 4, wherein the relay request signal generated by the other terminal is determined and output to the relay request signal generation unit. 6. The ad hoc network, wherein a media access control unit generates a communication area signal describing a condition for changing a communication area from information of a hidden terminal stored in a terminal management unit and is input to a modulation / demodulation unit. Further including a communication area signal generation unit for outputting the communication area signal added with the communication area signal generated by another terminal to the terminal management unit, wherein the access method control unit is input from the modulation / demodulation unit. The wireless communication terminal device according to claim 4, wherein the communication area signal generated by another terminal included in the ad hoc network is determined and output to the communication area signal generation unit.