JP2007028666A - Communication area reserving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To operate a plurality of wireless systems in the same area using a communication area reserving signal (NAV) in IEEE802.11. <P>SOLUTION: A communication terminal accommodating apparatus performs wireless communication to and from a communication terminal apparatus with an antenna 101, a wireless unit 102, a control unit 106, a logic link control unit 104, and a medium access control unit 103a. Furthermore, a communication area reserving signal is generated in a communication area reserving unit 107 when needed (for example, in starting the communication), and the communication area reserving signal is transmitted to the communication terminal apparatus via the wireless unit 102 and the antenna 101. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication area reservation method in a wireless local area network (LAN).

  In recent years, high-speed and large-capacity data transmission is desired in various user environments such as the public, offices, and homes, and wireless LAN (Local Area Network) technology has attracted attention as this data transmission technology. As this wireless LAN, there are systems in which standardization activities are being promoted by broadband wireless LANs (HiperLAN2, HiSWANa), IEEE802.11a, and the like.

  The broadband wireless LAN is a master / slave type network in which a plurality of communication terminals communicate with a communication terminal accommodating apparatus by performing centralized control with one communication terminal accommodating apparatus. Specifically, an access point (Access Point: AP) that is a communication terminal accommodating device concentrates control related to communication on a mobile terminal (Mobile Terminal: MT). Therefore, when the MT performs communication, the communication is always performed via the AP.

  Further, HiperLAN2 defines a communication mode between terminals. In the terminal-to-terminal communication mode, a period in which terminals can directly transmit and receive is given by permission of the AP. In this case, control of communication needs to be performed via the AP, but the data to be transmitted / received can be transmitted without passing through the AP.

  The IEEE802.11a system is defined as a direct connection type network, which is a centralized control type (Point Coordination Function: PCF) and a distributed control type (Distributed Coordination Function: DCF). In the centralized control type, a point coordinator (PC) having a control function concentrates control related to communication on a station (STA). Accordingly, when the STA performs communication, the communication is always performed according to the control of the PC.

  On the other hand, the distributed control type is configured such that each STA performs carrier sense for a predetermined time before transmitting data and performs communication after confirming that a transmission medium is available.

  As described above, broadband wireless LAN and IEEE802.11a are standardized as individual wireless LAN systems. At present, attempts have been made to integrate the systems.

  In IEEE 802.11a, a communication area reservation signal (NAV) is defined, and a communication terminal that receives this communication area reservation signal performs the same operation as when there is no available transmission medium during carrier sensing. It is decided to do.

  As described above, when combining a broadband wireless LAN and an IEEE 802.11a system, the communication area reservation signal (NAV) in IEEE 802.11a is also used from the broadband wireless LAN, and the communication terminal of the IEEE 802.11a It is expected to be able to suppress the collision.

  The present invention has been made in view of this point, and provides a communication area reservation method capable of stopping transmission of a broadband wireless LAN communication terminal using a communication area reservation signal (NAV) in IEEE 802.11. For the purpose.

  In the communication area reservation method of the present invention, a communication terminal accommodating apparatus that performs packet communication in a master / slave network transmits a communication area reservation signal at the start of communication, and a communication terminal apparatus of a different system that has received the communication area reservation signal It is characterized by suppressing communication.

  According to this method, it is possible to suppress transmission of the communication terminal apparatus of the IEEE802.11a system that may interfere with the communication terminal accommodating apparatus in the operation area of the broadband wireless LAN system such as HiperLAN2 / HiSWANa.

  According to the communication area reservation method of the present invention, a communication terminal apparatus that performs packet communication in a master / slave network transmits a communication area reservation signal at the start of communication, and communication terminal apparatuses of different systems that have received the communication area reservation signal communicate with each other. It is characterized by suppressing.

  According to this method, transmission of the communication terminal device of the IEEE802.11a system that may interfere with the communication terminal device trying to communicate can be suppressed in the operation area of the broadband wireless LAN system such as HiperLAN2 / HiSWANa. .

  The communication area reservation method of the present invention is characterized in that, in the above method, a plurality of communication terminal devices transmit a communication area reservation signal all at once.

  According to this method, resource consumption can be significantly reduced as compared with the case where each communication terminal apparatus sets a communication area reservation.

  The communication area reservation method of the present invention is characterized in that, in the above method, when a plurality of communication terminal devices transmit communication area reservation signals all at once, a predetermined communication area reservation signal is transmitted.

  According to this method, it is possible to only transmit a communication area reservation signal (data) used for setting a communication area reservation, and a device that satisfies all the specifications of IEEE802.11a only for setting a communication area reservation. Therefore, it is possible to suppress an increase in circuit scale.

  The communication area reservation method according to the present invention is characterized in that, in the above method, the transmission timing is controlled by using a half value of a time alignment value for controlling the transmission timing.

  The communication area reservation method of the present invention is characterized in that, in the above method, the transmission timing is controlled by using a value half the time alignment value in the negative time direction.

  According to these methods, when a plurality of communication terminal apparatuses transmit a communication area reservation signal at the same time, it is possible to reduce a time lag in which the plurality of communication terminal apparatuses receive the communication area reservation signal.

  The communication area reservation method of the present invention is characterized in that in the above method, the transmission timing is controlled without using a time alignment value for controlling the transmission timing.

  According to this method, it is possible to bypass the circuit for correcting the amount of time deviation specified by the communication terminal accommodating apparatus, and thus it is possible to suppress an increase in the number of circuits.

  The communication area reservation method of the present invention is characterized in that, in the above method, it is determined whether to actually transmit a communication area reservation signal with a certain probability.

  According to this method, the transmission of the communication area reservation signal is suppressed when the other communication terminal apparatus is nearby and the transmission of one communication area reservation signal is sufficient or when the transmission power becomes excessive. be able to.

  The communication area reservation method of the present invention is characterized in that, in the above method, the certain probability is calculated based on a packet collision frequency.

  According to this method, with the collision frequency as a parameter, the probability that the local station transmits a communication area reservation signal when there are few communication terminal apparatuses around the local station can be increased, and there is no other communication terminal apparatus nearby. On the contrary, the communication area reservation can be increased.

  The communication area reservation method of the present invention is characterized in that, in the above method, it is determined whether to transmit a communication area reservation signal based on a past communication result.

  According to this method, the communication area reservation signal is not transmitted when the communication has been obstructed in some way or when the power from the communication terminal accommodating apparatus is sufficient but the error is large. A reservation signal can be transmitted. As a result, wasteful power can be prevented from being consumed.

  In the communication area reservation method of the present invention, in the above method, the power of a communication area reservation signal from another communication terminal apparatus is measured, and the total value of the power and the power of the communication area reservation signal transmitted by the own station are The power of the communication area reservation signal transmitted by the own station is controlled so as to be within a specified power value.

  According to this method, since the transmission is performed up to the optimum power while suppressing the transmission power from becoming excessive, the communication area reservation signal can reach a sufficient area.

  The wireless communication device of the present invention is a wireless communication device having a function of a communication terminal accommodating device that performs packet communication in a master / slave network, and includes a communication region reservation signal generating unit that generates a communication region reservation signal, And a transmission means for transmitting the communication area reservation signal to the communication terminal device.

  According to this configuration, transmission of the communication terminal device of the IEEE802.11a system, which may interfere with the communication terminal accommodating device, can be suppressed in the operation area of the broadband wireless LAN system such as HiperLAN2 / HiSWANa.

  The wireless communication device of the present invention is a wireless communication device having a function of a communication terminal device that performs packet communication in a master / slave network, the communication region reservation signal generating means for generating a communication region reservation signal, and the communication And a transmission unit that transmits the area reservation signal to the communication terminal device and / or the communication terminal accommodating device.

  According to this configuration, transmission of the communication terminal device of the IEEE802.11a system that may interfere with the communication terminal device trying to communicate can be suppressed in the operation area of the broadband wireless LAN system such as HiperLAN2 / HiSWANa. .

  The communication area reservation program of the present invention includes a procedure for a communication terminal accommodating apparatus that performs packet communication in a master / slave network to generate a communication area reservation signal, a procedure for transmitting a communication area reservation signal at the start of communication, Is a program for executing

  The communication area reservation program of the present invention includes a procedure for a communication terminal device that performs packet communication in a master / slave network to generate a communication area reservation signal and a procedure for transmitting a communication area reservation signal at the start of communication. This is a program to be executed.

  According to these configurations, the same effect as when the communication area reservation method is realized by hardware can be exhibited.

  According to the present invention, a communication terminal accommodating apparatus or a communication terminal apparatus that performs packet communication in a master / slave network transmits a communication area reservation signal at the start of communication, and receives the communication area reservation signal. Suppresses communication, and therefore, in the operation area of the broadband wireless LAN system such as HiperLAN2 / HiSWANa, transmission of the communication terminal apparatus of the IEEE802.11a system that may interfere with the communication terminal accommodating apparatus or the communication terminal apparatus trying to communicate Can be suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a communication terminal accommodating apparatus that is a wireless communication apparatus according to Embodiment 1 of the present invention.

  This communication terminal accommodating apparatus includes an antenna 101 for receiving an uplink signal and transmitting a downlink signal, a radio signal reception process (such as down-conversion and A / D conversion) for an uplink signal, and a radio signal transmission process for a downlink signal ( A wireless unit 102 that performs D / A conversion and up-conversion), a control unit 106 that controls the entire device, a logical link control unit 104 that handles a protocol for communication terminal devices directly connected via a communication medium, A medium access control unit 103a that controls access to a communication medium shared between communication terminal devices, a scheduler 103b that schedules access control, a communication region reservation unit 107 that generates a communication region reservation signal, and a network 108 A network interface 105 that is an interface of the bus and a bus 109 that connects each processing unit. It is mainly composed of.

  The communication terminal accommodating device having such a configuration performs wireless communication with the communication terminal device by the antenna 101, the wireless unit 102, the control unit 106, the logical link control unit 104, and the medium access control unit 103a. The communication area reservation unit 107 generates a communication area reservation signal when necessary (for example, at the start of communication), and the communication area reservation signal is transmitted to the surrounding IEEE802.11a communication terminal apparatus (STA) via the wireless unit 102 and the antenna 101. Send to.

  In this way, a communication terminal accommodating apparatus (AP) that performs packet communication in a master / slave network transmits a communication area reservation signal (NAV) used in the IEEE802.11 system, thereby enabling a broadband wireless LAN such as HiperLAN2 / HiSWANa. In the system operation area, it is possible to suppress transmission of a communication terminal apparatus (STA) of the IEEE 802.11a system that may interfere with the communication terminal accommodating apparatus.

  FIG. 2 is a block diagram showing a configuration of a communication terminal apparatus that is a wireless communication apparatus according to Embodiment 1 of the present invention.

  This communication terminal apparatus includes an antenna 201 that receives downlink signals and transmits uplink signals, downlink signal radio reception processing (such as down-conversion and A / D conversion), and uplink signal radio transmission processing (D Wireless unit 202 that performs (/ A conversion, up-conversion, etc.), control unit 206 that controls the entire device, logical link control unit 204 that handles protocols for communication terminal accommodating devices that are directly connected via a communication medium, A medium access control unit 203 that controls access to a communication medium shared between communication terminal accommodating apparatuses, a communication region reservation unit 207 that generates a communication region reservation signal, and an interface 205 that is an interface with the upper layer 208, It is mainly composed of a bus 209 connecting each processing unit.

  The communication terminal device configured as described above performs wireless communication with the communication terminal accommodating device by the antenna 201, the wireless unit 202, the control unit 206, the logical link control unit 204, and the medium access control unit 203. The communication area reservation unit 207 generates a communication area reservation signal when necessary (for example, at the start of communication), and transmits the communication area reservation signal to the surrounding IEEE802.11a communication terminal apparatus (STA) via the wireless unit 202 and the antenna 201. Send to.

  In this way, a communication terminal apparatus (MT) that performs packet communication in a master / slave network transmits a communication area reservation signal (NAV) used in the IEEE 802.11 system, thereby enabling a broadband wireless LAN system such as HiperLAN2 / HiSWANa. In the operation area, it is possible to suppress transmission of the communication terminal apparatus (STA) of the IEEE802.11a system that may interfere with the communication terminal apparatus that is to perform communication.

  As described above, in the area indicated by the solid line in FIG. 3, the communication area reservation signal is transmitted to the communication terminal apparatus (STA) by the plurality of communication terminal apparatuses (MT) and the communication terminal accommodating apparatus (AP). Since the reservation is made, the plurality of communication terminal apparatuses (STAs) in the area indicated by the solid line are suppressed from communicating during the reserved period when the communication area reservation signal is received.

  Here, a case where a plurality of communication terminal devices transmit communication area reservation signals all at once will be described. When a plurality of communication terminal apparatuses transmit a communication area reservation signal, resource consumption can be greatly reduced as compared with the case where each communication terminal apparatus sets a communication area reservation.

  In this case, that is, when a plurality of communication terminal devices transmit a communication area reservation signal all at once, it is desirable to transmit a predetermined communication area reservation signal. Specifically, as shown in FIG. 4, the communication area reservation units 107 and 207 are composed of a predetermined reservation signal holding unit 401 and a reservation signal output unit 402, and when generating a communication area reservation signal, Predetermined data held in the reservation signal holding unit 401 is extracted and output from the reservation signal output unit 402 as a communication area reservation signal. Then, the communication area reservation signal of the predetermined data is transmitted to the surrounding communication terminal apparatus (STA) to make a communication area reservation.

  As a result, it is possible to simply transmit a communication area reservation signal (data) used for setting the communication area reservation, and to create a device satisfying all the specifications of IEEE802.11a only for setting the communication area reservation. This eliminates the need for an increase in circuit scale.

  Note that the content of the communication area reservation signal of the predetermined data may be different or may be the same when generated by the communication terminal accommodating device and when generated by the communication terminal device. However, when the communication terminal apparatus transmits simultaneously, the communication area reservation signal of exactly the same data is transmitted.

(Embodiment 2)
In the present embodiment, timing control in a case where communication terminal apparatuses transmit communication area reservation signals all at once according to instructions from the communication terminal accommodating apparatus will be described.

  FIG. 5 is a block diagram showing a partial configuration of a communication terminal accommodating apparatus that is a radio communication apparatus according to Embodiment 2 of the present invention. In FIG. 5, the same parts as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

  The communication area reservation unit 107 of the communication terminal accommodating apparatus shown in FIG. 5 includes a time alignment reference unit 501, a time alignment value calculation unit 502, a correction value inversion unit 503, a time alignment value resetting unit 504, and an MT communication region. The reservation instruction unit 505 is mainly configured.

  When transmitting a communication area reservation signal simultaneously from the communication terminal apparatuses, first, control information indicating that the communication area reservation signal is transmitted from the communication terminal accommodating apparatus is notified to each communication terminal apparatus. This control signal is recognized by the MT communication area reservation instructing unit 505, and a control signal indicating that it has been recognized is output to the time alignment reference unit 501.

  The time alignment reference unit 501 acquires a time alignment value for normal data communication for each communication terminal device. Time alignment is described in ARIB STD-T70 section 5.3.5.

  The acquired time alignment value of each communication terminal device is output to time alignment value calculation section 502. The time alignment value calculation unit 502 performs time alignment for each communication terminal device so that the timing (transmission timing of the communication area reservation signal) at each communication terminal device is minimized with respect to surrounding communication terminals. Adjust the value. Specifically, a half value of the time alignment value is obtained by calculation. Then, the time alignment value calculation unit 502 outputs the calculation value for each communication terminal device to the correction value inversion unit 503.

  The correction value inversion unit 503 inverts the sign of the calculated value. That is, the calculated value is set to a negative value. Then, the correction value inversion unit 503 outputs a negative value of the calculation value for each communication terminal device to the time alignment value resetting unit 504. The time alignment value resetting unit 504 resets the time alignment value by overwriting the negative value of the calculated value on the alignment value set by the medium access control unit. The reset time alignment value for each communication terminal apparatus is output to the MT communication area reservation instruction unit 505.

  The MT communication area reservation instructing unit 505 generates a control signal indicating that a communication area reservation signal is transmitted to each communication terminal apparatus with a time alignment value for each communication terminal apparatus. In other words, the transmission timing is controlled by using half the time alignment value in the negative time direction. And this control signal is timing-controlled for every communication terminal device, and is transmitted to each communication terminal device. As a result, each communication terminal apparatus transmits a communication area reservation signal simultaneously to surrounding communication terminal apparatuses (STAs).

  In this way, when a plurality of communication terminal apparatuses transmit a communication area reservation signal at the same time, the plurality of communication terminal apparatuses transmit the communication area reservation signal at a controlled transmission timing. The time lag at the receiving communication terminal can be reduced.

  FIG. 6 is a block diagram showing a partial configuration of a communication terminal accommodating apparatus that is a wireless communication apparatus according to Embodiment 2 of the present invention. In FIG. 6, the same parts as those in FIG. 5 are denoted by the same reference numerals as those in FIG.

  The communication area reservation unit 107 of the communication terminal accommodating apparatus shown in FIG. 6 mainly includes an MT communication area reservation instruction unit 505 and a time alignment value initialization instruction unit 601.

  In this case, when transmitting a communication area reservation signal all at once from the communication terminal apparatuses, first, control information indicating that the communication area reservation signal is transmitted from the communication terminal accommodating apparatus is notified to each communication terminal apparatus. This control signal is recognized by the MT communication area reservation instructing unit 505 and sent to the time alignment value initialization instructing unit 601.

  The time alignment value initialization unit 601 instructs the MT communication region reservation instruction unit 505 to initialize the timing (time alignment value) for instructing the communication terminal device to transmit a communication region reservation signal. The MT communication area reservation instructing unit 505 initializes the timing for giving an instruction to transmit a communication area reservation signal, and generates a control signal to transmit a communication area reservation signal to each communication terminal apparatus. And this control signal is timing-controlled for every communication terminal device, and is transmitted to each communication terminal device. As a result, each communication terminal apparatus transmits a communication area reservation signal simultaneously to surrounding communication terminal apparatuses (STAs).

  With this configuration, the normal data portion is time-aligned, but the control signal is transmitted to each communication terminal apparatus in a state where only the transmission timing of the communication area reservation signal is not affected by the time alignment. Thereby, it is possible to bypass a circuit for correcting the amount of time deviation specified by the communication terminal accommodating apparatus, and it is possible to suppress an increase in the number of circuits.

  FIG. 7 is a block diagram showing a partial configuration of a communication terminal accommodating apparatus that is a wireless communication apparatus according to Embodiment 2 of the present invention. In FIG. 7, the same parts as those in FIG. 5 are denoted by the same reference numerals as those in FIG.

  The communication region reservation unit 107 of the communication terminal accommodating apparatus shown in FIG. 7 includes a time alignment reference unit 501, a time alignment value calculation unit 502, a time alignment value reset unit 504, and an MT communication region reservation instruction unit 505. It is configured.

  In this case, when transmitting a communication area reservation signal simultaneously from the communication terminal apparatuses, first, control information indicating that the communication area reservation signal is transmitted from the communication terminal accommodating apparatus is notified to each communication terminal apparatus. This control signal is recognized by the MT communication area reservation instructing unit 505, and a control signal indicating that it has been recognized is output to the time alignment reference unit 501.

  The MT communication area reservation instructing unit 505 generates a control signal indicating that a communication area reservation signal is transmitted to each communication terminal apparatus with a time alignment value for each communication terminal apparatus. That is, the transmission timing is controlled using a value that is half the time alignment value. And this control signal is timing-controlled for every communication terminal device, and is transmitted to each communication terminal device. As a result, each communication terminal apparatus transmits a communication area reservation signal simultaneously to surrounding communication terminal apparatuses (STAs).

  In this way, when a plurality of communication terminal apparatuses transmit a communication area reservation signal at the same time, the plurality of communication terminal apparatuses transmit the communication area reservation signal at a controlled transmission timing. The time lag when receiving can be reduced. In particular, since it does not go through the correction value reversing unit, the calculated value of the time alignment value can be reflected in the transmission timing control more quickly than the configuration of FIG.

(Embodiment 3)
When the communication terminal apparatus transmits the communication area reservation signal all at once, for example, when another communication terminal apparatus is nearby and transmission of one communication area reservation signal is sufficient, or the transmission power becomes excessive. It is necessary to suppress transmission of the communication area reservation signal at the time. In the present embodiment, a case will be described in which transmission of a communication area reservation signal at such times is suppressed.

  As shown in FIG. 8, since there are few MTs in the area of the upper solid line 802, it is necessary to reliably transmit the communication area reservation signal. However, in the area of the dotted line 801, there are many MTs. If the communication area reservation signal is not transmitted probabilistically, the transmission power will be excessive.

  Therefore, in such a case, it is desirable to determine whether to actually transmit a communication area reservation signal with a certain probability. As a result, it is possible to suppress transmission of a communication area reservation signal when another communication terminal apparatus is nearby and transmission of one communication area reservation signal is sufficient, or when transmission power becomes excessive. .

  The certain probability is obtained from some data according to the communication error rate. For example, the certain probability is preferably calculated based on the packet collision frequency. Specifically, as shown in FIG. 9, when the collision frequency is high, it is considered that communication may be hindered, so the probability of transmitting a communication area reservation signal is increased. On the other hand, when the collision frequency is low, it is considered that communication is not hindered, so the probability of transmitting the communication area reservation signal is lowered.

  This makes it possible to reduce the probability that the local station will transmit a communication area reservation signal when there are few communication terminal devices that block communication around the local station using the collision frequency as a parameter. Conversely, when there are a large number of communication terminal devices to perform, the communication area reservation can be increased.

  In addition, when other communication terminal devices are nearby and transmission of one communication area reservation signal is sufficient, or when suppressing transmission of a communication area reservation signal when the transmission power becomes excessive, It is desirable to determine whether to transmit a communication area reservation signal based on past communication results. Specifically, as shown in FIG. 10, when the communication result is NG for a predetermined number of times, it is determined that the error is large and the communication area reservation signal must be transmitted, and the communication area reservation signal is Send.

  By doing so, the communication area reservation signal can be transmitted only when necessary, such as when communication has been obstructed in some way or when the power from the communication terminal accommodating device is sufficient but the error is large. . As a result, power consumption can be suppressed.

  In addition, when other communication terminal devices are nearby and transmission of one communication area reservation signal is sufficient, or when suppressing transmission of a communication area reservation signal when the transmission power becomes excessive, The communication area reservation signal transmitted from the local station is measured so that the power of the communication area reservation signal from another communication terminal apparatus is measured and the power of the communication area reservation signal transmitted by the local station is within the specified power value. It is desirable to control the power.

  Such control can be realized by a communication terminal apparatus having the configuration shown in FIG. FIG. 11 is a block diagram showing a partial configuration of a communication terminal apparatus that is a radio communication apparatus according to Embodiment 3 of the present invention.

  The communication area reservation unit 207 of the communication terminal apparatus shown in FIG. 11 mainly includes a reservation signal output power instruction unit 1101, an output power calculation unit 1102, and an ambient power reference unit 1103.

  In this case, first, the ambient power reference section 1103 refers to the power of the communication area reservation signal from the surrounding communication terminal apparatus. Then, the ambient power reference unit 1103 outputs the power of the communication area reservation signal from the surrounding communication terminal device to the output power calculation unit 1102.

  The output power calculation unit 1102 compares the power of the communication area reservation signal from the surrounding communication terminal apparatus with a predetermined specified power value. Specifically, a power value obtained by subtracting the measured power value from the specified power value is calculated. Since the obtained power value can be used as transmission power, the communication area reservation signal may be transmitted with a power value within the range of the power value. Therefore, the output power of the communication area reservation signal of the own station is obtained within this power value range. This output power is output to the reservation signal output power instruction unit 1101. The reservation signal output power instruction unit 1101 instructs to transmit a communication area reservation signal with the obtained output power.

  Note that this specified power value is used for transmission of a communication area reservation signal when another communication terminal device is nearby and transmission of one communication area reservation signal is sufficient, or when transmission power becomes excessive. It is determined appropriately in consideration of suppressing the above.

  Moreover, the power measurement of the communication area reservation signal transmitted by the surrounding communication terminal apparatuses can be performed while the transmission of the own station is stopped. In this case, there are no particular restrictions on the number and frequency of power measurements.

  According to such a configuration, since the transmission is performed up to the optimum power while suppressing the transmission power from becoming excessive, the communication area reservation signal can reach a sufficient area.

  The present invention is not limited to Embodiments 1 to 3 above, and can be implemented with various modifications. Further, Embodiments 1 to 3 described above can be implemented in combination as appropriate. For example, a wireless communication system can be configured by the communication terminal device and the communication terminal accommodating device described above.

  The communication area reservation method described above can also be configured by software. That is, a communication area reservation program for causing a computer to execute a procedure in which a communication terminal accommodating device that performs packet communication in a master / slave network generates a communication area reservation signal and transmits the communication area reservation signal at the start of communication, A communication area reservation program for causing a computer to execute a procedure in which a communication terminal device that performs packet communication in a master / slave network generates a communication area reservation signal and transmits the communication area reservation signal at the start of communication may be provided. . Even in this case, the same effect as when the communication area reservation method is realized by hardware can be exhibited.

  As described above, the communication area reservation method of the present invention can be applied to a communication terminal apparatus and a communication terminal accommodating apparatus in wireless communication in a broadband wireless LAN.

The block diagram which shows the structure of the communication terminal accommodating apparatus which is a radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. 1 is a block diagram showing a configuration of a communication terminal apparatus that is a wireless communication apparatus according to Embodiment 1 of the present invention. The figure for demonstrating the communication area reservation method which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of a part of communication terminal accommodation apparatus which is a radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of a part of communication terminal accommodation apparatus which is a radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. The block diagram which shows the structure of a part of communication terminal accommodation apparatus which is a radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. The block diagram which shows the structure of a part of communication terminal accommodation apparatus which is a radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. The figure for demonstrating the communication area reservation method which concerns on Embodiment 3 of this invention. The figure for demonstrating the communication area reservation method which concerns on Embodiment 3 of this invention. The figure for demonstrating the communication area reservation method which concerns on Embodiment 3 of this invention. FIG. 3 is a block diagram showing a configuration of a part of a communication terminal apparatus that is a wireless communication apparatus according to Embodiment 3 of the present invention.

Explanation of symbols

101, 201 Antenna 102, 202 Radio unit 103a, 203 Medium access control unit 103b Scheduler 104, 204 Logical link control unit 105 Network interface 106, 206 Control unit 107, 207 Communication area reservation unit 108 Network 109, 209 Bus 205 Interface 208 Higher level Layer 401 Specified reserved signal holding unit 402 Reserved signal output unit 501 Time alignment reference unit 502 Time alignment value calculation unit 503 Correction value inversion unit 504 Time alignment value reset unit 505 MT communication region reservation instruction unit 601 Time alignment value initialization instruction 1101 Reserved signal output power instruction unit 1102 Output power calculation unit 1103 Ambient power reference unit

Claims (1)

  A communication terminal accommodating apparatus that performs packet communication in a master / slave network transmits a communication area reservation signal at the start of communication, and communication terminal apparatuses of different systems that receive the communication area reservation signal suppress communication. Communication area reservation method.

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