JP2009071860A - Radio communication method and radio communication terminal accommodating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the throughput of communication, while maintaining compatibility with a radio communication system and a radio communication method which apply carrier sensing to a conventional multiple access method. <P>SOLUTION: A radio communication terminal accommodating apparatus determines the order in which the right of communication for occupying a radio transmission medium is assigned to a plurality of radio communication terminals, and transmits, to the plurality of radio communication terminals, a multi-polling signal 311 that includes information regarding the order at any transmission timings acquired by carrier sensing. As a result, each of the plurality of radio communication terminals is assigned a period of the right of communication that enables the radio transmission medium (right of communication periods 312-314) occupiable. Also, the time interval between adjacent communication right periods is set to be sufficiently short, as compared to the guard time (carrier sensing time) of a conventional system. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radio communication method in a radio communication system that transmits and receives data between a plurality of radio communication terminals using radio communication, and a radio communication terminal accommodating apparatus that accommodates a plurality of radio communication terminals in the radio communication system. About.

  2. Description of the Related Art Conventionally, there are wireless communication networks that exchange data between a plurality of wireless communication terminals using wireless communication. In the wireless communication method in this wireless communication network, there is a wireless communication terminal that manages communication (hereinafter, this wireless communication terminal is referred to as a wireless communication terminal accommodating device). In order to prevent loss due to collision of transmission data, there is no centralized communication method in which a communication right is given to and a wireless communication terminal accommodating device that manages communication between other wireless communication terminals. It is roughly divided into a distributed control type communication method that checks the communication status (carrier sense) in a wireless transmission medium (hereinafter referred to as transmission medium) and accesses the transmission medium when the transmission medium is free. Is done.

  In the distributed control type communication method, carrier sense is performed before each wireless communication terminal transmits, and transmission is started after confirming that the transmission medium is not used (no wireless signal is present on the transmission medium). . FIG. 13 is a diagram showing an example of a distributed control type configuration in a conventional radio communication system, and FIG. 14 is a time chart showing an example of communication performed in the radio communication system shown in FIG. FIG. 13 illustrates a wireless communication system having four wireless communication terminals 1001 to 1004 as an example. These wireless communication terminals 1001 to 1004 are equal, and as indicated by arrows, all the wireless communication terminals 1001 to 1004 can directly transmit and receive data.

For example, when data is transmitted from the wireless communication terminal 1001 to the wireless communication terminal 1004, the wireless communication terminal 1001 first confirms the communication status of the transmission medium by carrier sense, and starts from a point in time when there is no signal in the transmission medium. After waiting for time T _D + random time T _R1 , data is transmitted. In the transmission operation period 1111 in which this transmission operation is performed, for example, the following series of operations are performed. During the transmission operation period 1111, the other wireless communication terminals 1002 and 1003 detect signals transmitted from the wireless communication terminal 1001 to the transmission medium by carrier sense, and cannot perform a transmission operation using this transmission medium. It is set as follows.

First, the wireless communication terminal 1001 transmits a transmission request signal indicating a transmission request to the receiving-side wireless communication terminal 1004. The wireless communication terminal 1004 that has received the transmission request signal transmits a transmission permission signal indicating transmission permission as a response to the transmission request signal to the wireless communication terminal 1001 on the transmission side, and preparation for data reception is completed. Notify that. Upon receiving this transmission permission signal, the wireless communication terminal 1001 on the transmission side transmits a signal (data signal) related to data to the wireless communication terminal 1004 on the reception side, and the wireless communication terminal 1004 on the reception side receives this data Is received, a confirmation signal indicating that “successfully received” or “not correctly received” is transmitted to the wireless communication terminal 1001 on the transmission side, and the wireless communication terminal 1001 on the transmission side transmits this confirmation signal. The series of operations related to data transmission from the wireless communication terminal 1001 to the wireless communication terminal 1004 is completed. Note that, within the transmission operation period, when the wireless communication terminals 1001 to 1004 start signal transmission, signal transmission is performed after waiting for a predetermined time T _S (<T _D ). Therefore, for example, the predetermined time T _S is between the transmission request signal and the transmission permission signal, between the transmission permission signal and the data signal, and between the data signal and the confirmation signal.

  In addition, when a plurality of wireless communication terminals 1001 to 1004 perform transmission on the transmission path at the same time, contention (sometimes referred to as a collision) related to the use of the transmission medium occurs. In order to avoid such contention, the radio communication terminals 1001 to 1004 confirm that the transmission medium is free by carrier sense when starting the transmission operation, and then, for each radio communication terminal, only for a random time. By waiting, for example, it is possible to avoid a situation in which wireless communication terminals repeatedly compete with each other and communication is substantially disabled.

For example, when the wireless communication terminal 1002 and the wireless communication terminal 1003 try to transmit data after the transmission operation period 1111 of the wireless communication terminal 1001, after the transmission operation period 1111 ends, the wireless communication terminal 1002 has a predetermined time. The wireless communication terminal 1003 waits for a predetermined time T _D + random time T _R3 after T _D + random time T _R2 , and then tries to perform a data transmission operation. Here, when T _R2 <T _R3 , the wireless communication terminal 1002 starts signal transmission first, while the wireless communication terminal 1003 waits for its own transmission time and the wireless communication terminal 1002 The start of transmission is detected by carrier sense and transmission is postponed. Then, after the transmission operation period 1112 of the wireless communication terminal 1002 ends, a data transmission operation can be performed after waiting for a predetermined time T _D + (T _R3 −T _R2 ). That is, after the transmission operation period 1112 ends, a transmission operation period 1113 in which the wireless communication terminal 1003 transmits data is performed after a predetermined time T _D + (T _R3 −T _R2 ).

Further, the predetermined time T _D and a random time T _R to a waiting time of transmission, QoS of data transmitted and received requests: in accordance with (Quality of Service), set to a different value for each the QoS type It is possible to realize a communication method that supports QoS by making it possible or making it possible to determine by a different algorithm.

  On the other hand, in the centralized control type communication method, each wireless communication terminal communicates only with the wireless communication terminal accommodating device, and only the wireless communication terminal permitted to communicate by the wireless communication terminal accommodating device communicates. Is possible. FIG. 15 is a diagram illustrating an example of a centralized control type configuration in a conventional wireless communication system, and FIG. 16 is a time chart illustrating a first example of communication performed in the wireless communication system illustrated in FIG. In FIG. 15, a wireless communication system having one wireless communication terminal accommodating device 1201 and three wireless communication terminals 1202 to 1204 is illustrated as an example. As indicated by arrows in FIG. 15, each of the wireless communication terminals 1202 to 1204 can communicate only with the wireless communication terminal accommodating apparatus 1201.

The wireless communication terminal accommodating apparatus 1201 transmits an index signal (beacon signal) 1311 almost periodically in order to set a period for performing centralized control by the wireless communication terminal accommodating apparatus 1201 on the transmission medium. The wireless communication terminal accommodating apparatus 1201 can transmit a signal toward the transmission medium after a predetermined time T _P from the time when the signal disappears in the transmission medium, and the wireless communication terminals 1202 to 1204 are on standby. The transmission medium can be preferentially accessed compared to a predetermined time T _D (> T _P ) that must be present.

With this index signal 1311, all wireless communication terminals 1202 to 1204 are set so that data transmission operation cannot be performed unless communication permission is acquired from the wireless communication terminal accommodating apparatus 1201. When the predetermined period is started, the wireless communication terminal accommodating apparatus 1201 generates a polling signal (Poll) 1312 for performing notification of selecting a desired wireless communication terminal (for example, the wireless communication terminal 1202) as a communication partner. Send. At this time, it is also possible to transmit a data signal 1313 to be transmitted continuously. The wireless communication terminal 1202 receives this polling signal 1312 + data signal 1313, and transmits a polling reception confirmation signal (Poll confirmation) 1314 notifying completion of reception after a predetermined time T _S (<T _P ). Note that the wireless communication terminal 1202 can also transmit the data signal 1315 following the polling reception confirmation signal 1314.

After transmission of the wireless communication terminal 1202 is completed, the wireless communication terminal accommodating apparatus 1201 waits for a predetermined time T _{S and} confirms the reception of the data signal 1315 + another confirmation signal 1316 + another wireless communication terminal (for example, the wireless communication terminal 1203 It is also possible to create and send a polling signal (Poll) 1317 for). For some reason the radio communication terminal 1203, when not return the polling reception acknowledgment signal 1314 to the radio communication terminal accommodating apparatus 1201, the radio communication terminal accommodating apparatus 1201, after a predetermined time T _P, another radio communication terminal ( For example, a polling signal (Poll) 1318 can be transmitted to the wireless communication terminal 1204). When the wireless communication terminal accommodating apparatus 1201 transmits an end signal 1319, the centralized control type communication method ends.

FIG. 17 is a time chart showing a second example of communication performed in the wireless communication system shown in FIG. The radio communication terminal accommodating apparatus 1201, after a predetermined time T _P from the time the signal was lost to the transmission medium, may send a polling signal (Poll) 1411 to select one of the wireless communication terminal 1202-1204 it can. This polling signal 1411 is set so that communication with other wireless communication terminals 1202 to 1204 cannot be performed. After the end of transmission of the polling signal 1411, after a predetermined time T _{S has} elapsed, a transmittable period 1412 is set in which only the wireless communication terminal to which the transmission right is granted by the polling signal 1411 can be transmitted. This transmittable period 1412 continues until a predetermined time elapses after the polling signal 1411 is transmitted or until the end signal 1319 is transmitted by the wireless communication terminal accommodating apparatus 1201.

Note that the wireless communication terminal accommodating apparatus 1201 may transmit this polling signal 1411 at any time if the predetermined time T _{P has} elapsed since the absence of any signal on the transmission medium, and the predetermined time T _P is set shorter than the predetermined time T _D is a waiting time of the wireless communication device 1202-1204. Furthermore, the own radio communication terminal accommodating apparatus 1201 can be selected by the polling signal 1411, and the mode of communication within the transmittable period 1412 is not limited (that is, the own radio communication again within the transmittable period 1412). Since a polling signal for selecting the terminal accommodating device 1201 can also be transmitted), the wireless communication terminal accommodating device 1201 has a very strong access right to the transmission medium.

  FIG. 18 is a schematic diagram showing an example of communication combining conventional distributed control type and centralized control type communication methods. As shown in FIG. 18, the above distributed control type and centralized control type communication methods are used in combination. For example, in a wireless communication system in which a wireless communication terminal accommodating apparatus 1201 as shown in FIG. 15 exists, the distributed control type communication method and the centralized control type communication method shown in FIG. The wireless communication terminal accommodating apparatus 1201 can start the communication method shown in the second example of the centralized control type whenever desired.

However, in the conventional wireless communication method, mainly between the signals transmitted by each wireless communication terminal or the wireless communication terminal accommodating device to the wireless transmission medium for the purpose of avoiding competition between the wireless communication terminals and avoiding signal collision. Overhead (for example, sending a polling signal for each wireless communication terminal) other than data such as a guard time (for example, the predetermined time T _S , T _P , T _D, etc.) or a control signal is provided. . The longer the communication time related to the guard time and overhead, the shorter the data communication time, causing a reduction in throughput, which is a major factor for reducing the data communication throughput. Here, the throughput is an average data transmission amount per unit time that is correctly transmitted and received between the transmitter and the receiver through the wireless transmission medium, and is usually expressed by an average number of bits [bit / second] correctly transmitted per second. Is done.

  In view of the above problems, the present invention maintains compatibility with a wireless communication system and a wireless communication method using time division multiple access (TDMA) using carrier sense in the conventional multiple access method. However, an object of the present invention is to provide a wireless communication method and a wireless communication terminal accommodating apparatus that can improve communication throughput.

In order to achieve the above object, a wireless communication method of the present invention includes a single wireless communication terminal accommodating device and a plurality of wireless communication terminals whose communication is controlled by the wireless communication terminal accommodating device as a wireless transmission medium. A wireless communication method in a wireless communication system for performing communication, wherein a wireless communication terminal accommodating device determines an order of assignment of communication rights that can occupy a wireless transmission medium for each of a plurality of wireless communication terminals. The wireless communication terminal accommodating device monitors the communication in the wireless transmission medium, and at the arbitrary timing when the no-signal time of a predetermined length or more is detected in the communication on the wireless transmission medium, the determined communication right assignment The information on the order is collectively transmitted to a plurality of wireless communication terminals, and each of the plurality of wireless communication terminals is transmitted to the wireless transmission medium based on the information on the order. And to perform the communication to win the communication right to.
As a result, the wireless communication terminal accommodating device can determine the order in which the communication right is given to each wireless communication terminal, and can transmit information that defines this order at any transmission timing acquired by carrier sense. It is possible to improve the communication throughput by optimizing the time interval between adjacent communication right periods.

To achieve the above object, the wireless communication method of the present invention wirelessly transmits one wireless communication terminal accommodating device and a plurality of wireless communication terminals whose communication is controlled by the wireless communication terminal accommodating device. A wireless communication method in a wireless communication system in which communication is performed via a medium, wherein a wireless communication terminal accommodating apparatus is able to occupy a wireless transmission medium for each of a plurality of wireless communication terminals. The wireless communication terminal accommodating apparatus determines the order of assignment of communication rights that can occupy the wireless transmission medium for each of the plurality of wireless communication terminals. Monitors communication and collects information related to time zones and order collectively at any time when no signal time longer than a predetermined length is detected in communication on a wireless transmission medium. Each of the plurality of wireless communication terminals obtains the communication right in the wireless transmission medium based on the information on the time zone and performs communication, and then, based on the information on the order. The communication right in the wireless transmission medium is acquired and communication is performed.
As a result, the wireless communication terminal accommodating apparatus can set a time zone in which a communication right is given to each wireless communication terminal, and can transmit information specifying the time zone at an arbitrary transmission timing acquired by carrier sense. Thus, it is possible to optimize the time interval between adjacent communication right periods and improve the communication throughput. In addition, it is possible to determine the order in which communication rights are given following the setting of communication rights in this time zone, and to transmit information that defines this order at an arbitrary transmission timing obtained by carrier sense, and the adjacent communication right period It is possible to improve the communication throughput by optimizing the time interval.

Further, in the present invention, in addition to the above-described invention, when the wireless communication terminal starts communication with the communication right assigned by the order, the communication by the wireless communication terminal to which the immediately preceding order is assigned is monitored. In the communication by the wireless communication terminal to which the order is assigned, when a no-signal time longer than a predetermined length is detected, it is determined that the communication right period has come, and communication according to the communication right is started. .
Thereby, it is possible to smoothly and surely shift the communication right period determined by the order.

Furthermore, in the present invention, in addition to the above-described invention, when the wireless communication terminal ends communication with the communication right assigned in order, information indicating the end of communication with the communication right is transmitted.
As a result, the end of the communication right can be clearly declared to the wireless communication terminal accommodating apparatus and the other wireless communication terminals, and the transfer of the communication right can be performed smoothly and reliably.

Further, in the present invention, in addition to the above-described invention, the wireless communication terminal monitors communication by the wireless communication terminal to which the immediately preceding order is assigned, and terminates communication from the wireless communication terminal to which the immediately preceding order is assigned. When it is detected that the indicated information has been transmitted, it is determined that the communication right period has come, and communication using the communication right is started.
Thereby, it is possible to smoothly and surely shift the communication right period determined by the order.

Further, in the present invention, in addition to the above-described invention, among the communication rights assigned according to the order, the wireless communication terminals to which the subsequent order is assigned in the communication rights in the adjacent order are assigned the previous order. The wireless communication terminal accommodating apparatus assigns the order so that the communication by the wireless communication terminal can be monitored.
Thereby, it is possible to smoothly and surely shift the communication right period determined by the order.

Further, in the present invention, in addition to the above invention, each of the plurality of wireless communication terminals acquires identification information of other wireless communication terminals capable of monitoring communication, and each of the plurality of wireless communication terminals monitors Based on the identification information of the other wireless communication terminals received from each of the plurality of wireless communication terminals. , The order is assigned.
As a result, the wireless communication terminal accommodating apparatus can determine the order in which the communication right period can be smoothly and reliably transferred.

To achieve the above object, the wireless communication method of the present invention wirelessly transmits one wireless communication terminal accommodating device and a plurality of wireless communication terminals whose communication is controlled by the wireless communication terminal accommodating device. A wireless communication method in a wireless communication system in which communication is performed via a medium, wherein a wireless communication terminal accommodating apparatus is able to occupy a wireless transmission medium for each of a plurality of wireless communication terminals. The wireless communication terminal accommodating apparatus monitors the communication in the wireless transmission medium, and in the communication on the wireless transmission medium, information on the time zone is obtained at an arbitrary timing when a no-signal time longer than a predetermined length is detected. Collectively transmit to a plurality of wireless communication terminals, and each of the plurality of wireless communication terminals acquires the communication right in the wireless transmission medium based on the information on the time zone. And to perform the communication.
As a result, the wireless communication terminal accommodating apparatus can set a time zone in which a communication right is given to each wireless communication terminal, and can transmit information specifying the time zone at an arbitrary transmission timing acquired by carrier sense. Thus, it is possible to optimize the time interval between adjacent communication right periods and improve the communication throughput.

Furthermore, in the present invention, in addition to the above-described invention, when communication for all communication rights assigned to a plurality of wireless communication terminals by the wireless communication terminal accommodating apparatus is completed, the communication mode in the wireless transmission medium is set to wireless communication. It returns to the communication mode performed before the communication right allocation by the terminal accommodating apparatus.
This makes it possible to maintain compatibility with a wireless communication system or a wireless communication method that uses carrier sense in the conventional multiple access method.

In order to achieve the above object, the wireless communication terminal accommodating apparatus of the present invention communicates with each of a plurality of wireless communication terminals via a wireless transmission medium, and controls communication in each of the plurality of wireless communication terminals. A wireless communication terminal accommodating device, a unit for determining an order of assignment of communication rights that can occupy a wireless transmission medium for each of a plurality of wireless communication terminals, monitoring communication in the wireless transmission medium, and wireless transmission In communication on a medium, at any timing at which a no-signal time of a predetermined length or more is detected, information relating to the order is collectively transmitted to a plurality of wireless communication terminals, and the plurality of wireless communication terminals Each of the devices acquires communication rights in the wireless transmission medium based on the information regarding the order so that communication can be performed.
With this configuration, the wireless communication terminal accommodating device can determine the order in which the communication right is given to each wireless communication terminal, and can transmit information that determines the order at any transmission timing obtained by carrier sense. It is possible to improve the communication throughput by optimizing the time interval between adjacent communication right periods.

In order to achieve the above object, the wireless communication terminal accommodating apparatus of the present invention communicates with each of a plurality of wireless communication terminals via a wireless transmission medium, and controls communication in each of the plurality of wireless communication terminals. A wireless communication terminal accommodating device, wherein the wireless communication terminal accommodating device determines a communication right allocation time zone in which a wireless transmission medium can be occupied for each of a plurality of wireless communication terminals, and a plurality of wireless communication terminals Means for deciding the order of assignment of communication rights that can occupy the wireless transmission medium for each of the communication terminals, and monitoring the communication in the wireless transmission medium; A plurality of wireless communication terminals having means for collectively transmitting information on time zones and orders to a plurality of wireless communication terminals at an arbitrary timing at which no-signal time is detected. Based on the information on the time zone, each acquires the communication right in the wireless transmission medium to perform communication, and then, based on the information on the order, acquires the communication right in the wireless transmission medium so that communication can be performed. ing.
With this configuration, the wireless communication terminal accommodating device can determine a time zone in which a communication right is given to each wireless communication terminal, and can transmit information defining this time zone at an arbitrary transmission timing acquired by carrier sense. It becomes possible to improve the throughput of communication by optimizing the time interval between adjacent communication right periods. In addition, it is possible to determine the order in which communication rights are given following the setting of communication rights in this time zone, and to transmit information that defines this order at an arbitrary transmission timing obtained by carrier sense, and the adjacent communication right period It is possible to improve the communication throughput by optimizing the time interval.

In order to achieve the above object, the wireless communication terminal accommodating apparatus of the present invention communicates with each of a plurality of wireless communication terminals via a wireless transmission medium, and controls communication in each of the plurality of wireless communication terminals. A wireless communication terminal accommodating device, means for determining a communication right allocation time zone for allowing a wireless transmission medium to be occupied for each of a plurality of wireless communication terminals, monitoring communication in the wireless transmission medium, and wireless Means for collectively transmitting information on time zones to a plurality of radio communication terminals at an arbitrary timing at which a no-signal time of a predetermined length or more is detected in communication on a transmission medium, and a plurality of radio Each of the communication terminals acquires a communication right in the wireless transmission medium based on the information on the time zone and can perform communication.
With this configuration, the wireless communication terminal accommodating device can determine a time zone in which a communication right is given to each wireless communication terminal, and can transmit information defining this time zone at an arbitrary transmission timing acquired by carrier sense. It becomes possible to improve the throughput of communication by optimizing the time interval between adjacent communication right periods.

  According to the present invention, the wireless communication terminal accommodating apparatus determines an order of assignment of communication rights that allows the wireless communication terminal to occupy the wireless transmission medium for each of the plurality of wireless communication terminals. In communication on a wireless transmission medium, information relating to the order is collected and transmitted to a plurality of wireless communication terminals at an arbitrary timing when a no-signal time of a predetermined length or more is detected in the communication on the wireless transmission medium. Since each of the communication terminals acquires the communication right in the wireless transmission medium based on the information on the order and performs communication, the wireless communication terminal accommodating apparatus determines the order in which the communication right is given to each wireless communication terminal, It is possible to transmit information that defines this order at any transmission timing acquired by carrier sense, and minimize the time interval between adjacent communication right periods. Turned into it, it is possible to improve the communication throughput.

  According to the present invention, the wireless communication terminal accommodating apparatus determines a communication right allocation time zone in which the wireless communication terminal accommodating apparatus can occupy a wireless transmission medium for each of the plurality of wireless communication terminals. Monitors communication on the transmission medium, and transmits information related to the time zone to multiple wireless communication terminals at an arbitrary timing at which no signal time longer than a predetermined length is detected in communication on the wireless transmission medium. Since each of the plurality of wireless communication terminals acquires the communication right in the wireless transmission medium based on the information on the time zone and performs communication, the wireless communication terminal accommodating apparatus grants the communication right to each wireless communication terminal. It is possible to transmit information that defines this time zone at an arbitrary transmission timing acquired by carrier sense by setting a given time zone and adjacent communication rights period By optimizing the time interval, it is possible to improve the communication throughput.

  According to the present invention, the wireless communication terminal accommodating apparatus determines a communication right assignment time zone in which the wireless transmission terminal can occupy a wireless transmission medium for each of the plurality of wireless communication terminals. The order of assignment of communication rights to allow each wireless communication terminal to occupy the wireless transmission medium is determined, and the wireless communication terminal accommodating apparatus monitors communication in the wireless transmission medium, and in communication on the wireless transmission medium , At an arbitrary timing when a no-signal time of a predetermined length or more is detected, information on the time zone and the order is collectively transmitted to a plurality of radio communication terminals, and each of the plurality of radio communication terminals is related to the time zone. Based on the information, the communication right in the wireless transmission medium is acquired and communicated, and then the communication right in the wireless transmission medium is acquired and communicated based on the information on the order. Therefore, the wireless communication terminal accommodating apparatus can set a time zone in which a communication right is given to each wireless communication terminal, and can transmit information specifying the time zone at an arbitrary transmission timing acquired by carrier sense. It is possible to improve the throughput of communication by optimizing the time interval between adjacent communication right periods, and determine the order to give the communication right following the setting of communication right in this time zone, and acquire by carrier sense Thus, it is possible to transmit information in which this order is determined at any transmission timing, and it is possible to improve the communication throughput by optimizing the time interval between adjacent communication right periods.

  Hereinafter, first to third embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a wireless communication system common to the first to third embodiments of the present invention. As shown in FIG. 1, the wireless communication system of the present invention is a centralized control type composed of one wireless communication terminal accommodating device 101 and a plurality of wireless communication terminals accommodated in the wireless communication terminal accommodating device 101. . In the wireless communication system shown in FIG. 1, the following description is given on the assumption that n wireless communication terminals 102 a to 102 n exist.

  FIG. 2 is a schematic diagram showing an outline of communication common to the first to third embodiments of the present invention. According to the wireless communication method of the present invention, the conventional distributed control type communication method and the conventional centralized control type communication method shown in the first example of the centralized control type are alternately and periodically controlled by the control of the wireless communication terminal accommodating apparatus 101. In the mode of communication being performed, the wireless communication terminal accommodating apparatus 101 can be started anytime as desired. Therefore, it can be said that it is equivalent to the communication method shown in the second example of the conventional centralized control type.

  FIG. 3 is a block diagram showing a configuration of a wireless communication terminal accommodating apparatus common to the first to third embodiments of the present invention. The wireless communication terminal accommodating apparatus 101 shown in FIG. 3 includes an antenna 11, a wireless transmission / reception unit 12, a PHY (Physical Layer) unit 13, a DLC (Data Link Control) unit 14, and a MAC (Media Access Control). ) Section 15 and scheduler section 16. The radio transmission / reception unit 12 performs signal conversion for transmitting the signal received from the PHY unit 13 as a radio signal from the antenna 11, converts the radio signal received by the antenna 11, and outputs the radio signal to the PHY unit 13. The PHY unit 13 performs mutual conversion between data to be transmitted and received and a signal corresponding to the wireless transmission path. The DLC unit 14 performs data transmission control, and the MAC unit 15 is a part of the DLC unit 14 and performs transmission control of data to a medium.

  In addition, the scheduler unit 16 assigns communication rights to the wireless communication terminals 102a to 102n. Specifically, the scheduler unit 16 determines, for example, the order of communication right assignment (first embodiment described later), communication right assignment for each of the plurality of wireless communication terminals 102a to 102n. Determine the time zone (second embodiment to be described later), or determine both the communication right assignment order and the time zone (third embodiment to be described later), and Generation of a multi-polling signal indicating assignment, control of transmission timing of data to be transmitted, and the like are performed.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described. FIG. 4 is a time chart showing communication in the first embodiment of the present invention. First, the radio communication terminal accommodating apparatus 101, carrier sense communications situation of the transmission medium, after waiting for a predetermined carrier sense time T _P from the time the signal was lost in transmission media, multi-polling signal (MultiPoll) 311 a transmission medium Send on. The transmission of the multi-polling signal 311 is performed by broadcasting to the wireless communication terminals 102a to 102n, and all the wireless communication terminals 102a to 102n accommodated in the wireless communication terminal accommodating apparatus 101 are transmitted to the multi-polling signal 311. Can be received and referenced.

  The multi-polling signal 311 describes the order in which communication rights are given to the wireless communication terminals 102a to 102n. That is, the order in which communication rights are given is described in the multi-polling signal 311 such as “wireless communication terminal 102a”, “wireless communication terminal 102b”,..., “Wireless communication terminal 102n”. The identifier of the “wireless communication terminal 102a” that identifies the wireless communication terminal 102a can use, for example, a globally unique MACID or a connection ID that is set at the time of connection. The apparatus 101 preferably acquires or sets these identifiers in advance.

  As a method for the wireless communication terminal accommodating apparatus 101 to assign a communication right to each of the wireless communication terminals 102a to 102n, for example, a method of selectively assigning a communication right to the wireless communication terminals 102a to 102n that request data transmission And a method of assigning communication rights to all the wireless communication terminals 102a to 102n. Also, the communication right may be assigned to the wireless communication terminal accommodating apparatus 101 itself by the multi-polling signal 311 as in the case of the wireless communication terminals 102a to 102n.

  In the method of selectively assigning communication rights to the wireless communication terminals 102a to 102n that request data transmission, the wireless communication terminal accommodating apparatus 101 transmits data from each of the wireless communication terminals 102a to 102n before transmitting the multi-polling signal 311. By collecting the transmission requests, the communication right is given only to the wireless communication terminals 102a to 102n requesting data transmission. At this time, for example, when there are a large number of wireless communication terminals 102a to 102n that request data transmission, the wireless communication terminal accommodating apparatus 101 may further limit the wireless communication terminals 102a to 102n to which the communication right is given. Is possible. In this method, only the identification information of the wireless communication terminals 102a to 102n requesting data transmission is described in the multi-polling signal 311.

  On the other hand, in the method of assigning communication rights to all the radio communication terminals 102a to 102n, the radio communication terminal accommodating apparatus 101 generates a multi-polling signal in which the identification information of all the radio communication terminals 102a to 102n to be accommodated is described. To do. The wireless communication terminal accommodating apparatus 101 uses or combines the above two methods depending on the number of the wireless communication terminals 102a to 102n to be accommodated, the number of the wireless communication terminals 102a to 102n that request data transmission, and the like. It is also possible to do. If the number of wireless communication terminals to be accommodated is large, the first multi-polling signal 311 assigns the communication rights of the wireless communication terminals 102a to 102f, and the next multi-polling signal 311 is assigned to the wireless communication terminals 102g to 102n. It is also possible to divide the communication right assignment into a plurality of multi-polling signals 311 such as assigning the communication right.

After the end of transmission of the multi-polling signal 311, communication is performed according to the communication rights of the wireless communication terminals 102 a to 102 n assigned by the multi-polling signal 311. That is, after the transmission of the multi-polling signal 311 is finished, the communication right period 312 of the wireless communication terminal 102a is started after a predetermined time T _A (<T _P ) that is sufficiently shorter than the conventional guard time. Incidentally, by a multi-polling signal 311, the next transmitted is definite radio communication terminal 102a that is permitted, the time T _A is also possible to use a shorter predetermined time than the conventional predetermined time T _S is there. In this communication right period 312, of the n wireless communication terminals 102a to 102n, only the wireless communication terminal 102a is permitted to communicate on the transmission medium, and other wireless communication terminals excluding the other wireless communication terminals 102a are not permitted. 102b to 102n are set so that a transmission operation using this transmission medium cannot be performed.

The wireless communication terminal accommodating apparatus 101 does not define the length of the communication right period 312 and the communication right period 312 of the wireless communication terminal 102a lasts until the wireless communication terminal 102a finishes data transmission. Furthermore, within the communication right time period 312, the radio communication terminal 102a, it is preferable to use a short predetermined time T _B than the above T _A. As the predetermined time T _B, for example, (the time required to switch from receive to transmit) the shortest guard time can be used. The wireless communication terminal 102b to which the order of the communication right period is assigned next to the wireless communication terminal 102a performing communication using the communication right period 312 is wirelessly connected to the wireless communication terminal accommodating apparatus 101 in the communication right period 312. When the communication with the communication terminal 102a is monitored and the wireless transmission medium becomes no signal for a predetermined time T _A (> T _B , <T _P ) from the time when the signal finally exists on the transmission medium, Transmission is started and the communication right period 312 of the wireless communication terminal 102a is shifted to the communication right period 313 of the wireless communication terminal 102b. Here, the wireless communication terminal 102b, to which the communication right is granted next to the wireless communication terminal 102a, detects the transfer timing of the communication right by performing carrier sense, but for example, the end of the communication right period Alternatively, it is possible to clarify the transfer timing of the communication right by mounting a bit indicating voluntary release in a confirmation signal 412 described later, confirmation signals 422a to 422c, the last packet when transmission is finished, or the like. is there.

Further, the wireless communication terminals 102a to 102n that do not require the communication right defined by the multi-polling signal 311 (for example, the wireless communication terminals 102a to 102n that cancel the data transmission of the data transmission requested, or the data transmission is not performed). Wireless communication terminals 102a to 102n) to which a communication right is assigned need to transmit some signal and use the communication right. At this time, the signal transmitted by the wireless communication terminals 102a to 102n that do not require the communication right may be an arbitrary signal. When a no-signal period longer than the predetermined time T _P occurs on the transmission medium, communication may be performed without following the order set by the multi-polling signal 311. Thus, it is necessary to prevent a no-signal period longer than the predetermined time T _P from occurring.

  In this way, the communication right periods 312 and 313 are shifted in accordance with the order set by the multi-polling signal 311. When the communication right period 314 of the wireless communication terminal 102n set at the end of the order is ended, again, The wireless communication system returns to the distributed control communication method. For example, the maximum communication right period of each of the wireless communication terminals 102a to 102n is set, and after that period, the wireless communication terminals 102a to 102n corresponding to the next order are shifted to the communication right period, or wireless When the communication terminal accommodating apparatus 101 transmits a forced termination signal, it is possible to return to the distributed control type communication method. During the period in which the distributed control type communication method is implemented, the conventional wireless communication terminal can also transmit and receive. Further, after the end of the communication right period 314, the next multi-polling signal 311 may be transmitted again without returning to the distributed control, and the communication method similar to that in FIG.

  Further, the wireless communication terminal accommodating apparatus 101 sets the last communication right period defined by the multi-polling signal 311 in the wireless communication terminal accommodating apparatus 101 itself, and again during this last communication right period, the multi-polling signal 311 is set again. It is also possible to continue the communication mode defined by the multi-polling signal 311 by transmitting.

  In addition, when the communication right period 314 of the wireless communication terminal 102n that is set last ends and returns to the distributed control communication method, it is detected that the communication mode defined by the multi-polling signal 311 has ended. Wireless communication terminals 102a to 102n that cannot be performed (for example, wireless communication terminals that cannot detect the communication of the wireless communication terminal 102n) may occur. In this case, the fairness of the wireless communication terminals 102a to 102n is lacking. It becomes a wireless communication system.

In order to maintain the fairness of the wireless communication terminals 102a to 102n, for example, communication may be performed according to the following settings.
When the wireless communication terminal accommodating apparatus 101 detects the end of the last communication right period 314, it broadcasts an end notification signal indicating the end of the communication mode to all the wireless communication terminals 102a to 102n.
Power control (transmission power control) is performed, and among the wireless communication terminals 102a to 102n, there are wireless communication terminals 102a to 102n that the wireless communication terminal accommodating apparatus 101 may not be able to detect communication. If included, the last communication right period 314 is always assigned to the wireless communication terminals 102a to 102n that can be detected by the wireless communication terminal accommodation apparatus 101, so that the wireless communication terminal accommodation apparatus 101 has the last communication right. When the end of the period 314 is detected, an end notification signal indicating the end of the communication mode is broadcast to all the wireless communication terminals 102a to 102n.
The last communication right period 314 is set in the wireless communication terminal accommodating apparatus 101 itself, and at the end of the communication right period, an end notification signal indicating the end of the communication mode is broadcast to all the wireless communication terminals 102a to 102n.
A maximum duration of the communication mode defined by the multi-polling signal 311 is set, and when this maximum duration is exceeded, the wireless communication system returns to the distributed control type communication method.

  Also, in each communication right period 312 to 314, the wireless communication terminals 102a to 102n that perform communication using the communication right period (assigned communication right) may use any communication mode. . FIG. 5 is a time chart showing an aspect of communication within the communication right period in the first embodiment of the present invention. For example, in the communication right period 312, the wireless communication terminal 102a continuously transmits the data signals 411a to 411e to be transmitted to the wireless communication terminal accommodating apparatus 101 as shown in FIG. Can transmit the confirmation signal 412 for confirming the reception of the data signals 411a to 411e once, and as shown in FIG. 5B, the data signals 421a to 421c and the confirmation signals 422a to 422c Can be transmitted alternately once.

As described above, it is preferable that a predetermined time T _B (<T _A ) is used within each communication right period 312 to 314. Also, better to transmit to the radio communication terminal accommodating apparatus 101 continues the data signal to be transmitted, reduces redundant predetermined time T _B and confirmation signal, the communication efficiency is improved. Further, in the communication characteristic of the present invention after the multi-polling signal 311 is transmitted, the times T _A and T _B shorter than the predetermined time T _P conventionally used as the waiting time between data are used. . As a result, the wireless communication terminal accommodating apparatus and the wireless communication terminal of the conventional system cannot perform data transmission. Also, when it takes time to turn around or when the already assigned communication right is used, the wireless communication terminals 102a to 102e are in the power saving mode, It is also possible to suppress unnecessary electricity consumption.

  Further, the order of the wireless communication terminals 102a to 102n set by the multi-polling signal 311 needs to be set carefully for the following reason. FIG. 6 is a schematic diagram showing an example of the configuration of the wireless communication system according to the first embodiment of the present invention. For easy understanding, FIG. 6 shows a wireless communication system including one wireless communication terminal accommodating apparatus 101 and five wireless communication terminals 102a to 102e. Is schematically depicted. The five wireless communication terminals 102a to 102e are assigned numbers (1) to (5), respectively. In the figure, the numbers (1) to (5) given to the wireless communication terminals 102a to 102e are indicated by circled numbers.

  FIG. 7 is a diagram showing a relationship of detection of the presence of wireless communication terminals in the wireless communication system shown in FIG. The left column of FIG. 7 shows the detection subject, and the upper column shows the detection object. If the detection subject can detect the presence of the detection object, ○, When the presence cannot be detected, x is described. As can be seen with reference to FIGS. 6 and 7, for example, since the wireless communication terminal 102a exists within the communication range of the wireless communication terminals 102b, 102d, and 102e, it is possible to know their existence. Since it exists outside the communication range of the wireless communication terminal 102c, the communication related to the wireless communication terminal 102c cannot be accurately detected.

  Therefore, for example, in FIG. 6, when the order of the wireless communication terminal 102a is assigned next to the wireless communication terminal 102c, the wireless communication terminal 102a cannot detect the end of the communication right period related to the wireless communication terminal 102c. Therefore, the transition of the continuous communication right period is not normally performed. In order to avoid this problem, for example, the wireless communication terminal accommodating apparatus 101 acquires information about the other wireless communication terminals 102a to 102e that can be detected by the wireless communication terminals 102a to 102e from the wireless communication terminals 102a to 102e. A list as shown in FIG. 7 is created and assigned in order.

  FIG. 8 is a diagram schematically showing a relationship of presence detection of the wireless communication system in the first embodiment of the present invention. In FIG. 8, the relationship between the wireless communication terminals 102a to 102e in the wireless communication system in FIGS. 6 and 7 is illustrated. In addition, when a signal arrives from one wireless communication terminal to the other wireless communication terminal (when the other wireless communication terminal exists within the communication range of one wireless communication terminal), from one wireless communication terminal An arrow is attached to the other wireless communication terminal. For example, in FIG. 8, a route that can be drawn with a single stroke is searched through all the wireless communication terminals 102a to 102e. Then, according to the path (for example, (1) → (3) → (5) → (4) → (2)) that can be drawn with one stroke, the order of the communication right period is set, thereby shifting the communication right organization. It is possible to set the order in which the images are smoothly performed. In addition, the order in which one-stroke writing is possible may be set including the wireless communication terminal accommodating apparatus 101.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. FIG. 9 is a time chart showing communication in the second embodiment of the present invention. As in the first embodiment, the radio communication terminal accommodating apparatus 101, carrier sense communications situation of the transmission medium, after waiting for a predetermined carrier sense time T _P from the time the signal was lost in transmission media, multi-polling signal (MultiPoll) 811 is transmitted on the transmission medium.

  The multi-polling signal 811 includes a start time and an end time at which communication rights are given to the wireless communication terminals 102a to 102n, and a downlink (transmission from the wireless communication terminal accommodating apparatus 101 to the wireless communication terminals 102a to 102n). Alternatively, information related to uplink (transmission from the wireless communication terminals 102a to 102n to the wireless communication terminal accommodating apparatus 101) is described. The description of the start time may be a relative time based on a certain time, or a universal time can be used. Further, in addition to the start time, the communication right period 812 to 817 can describe the duration of the communication right period and the end time of the communication right period.

  It is also possible for the multi-polling signal 811 to define the time of each communication right period following the next multi-polling signal 811 instead of the time of each communication right period 812 to 817 immediately following the signal. In addition, if the length of the communication right period 812 to 817, the downlink or uplink allocation method, etc. are defined between the wireless communication terminal accommodating apparatus 101 and the wireless communication terminals 102a to 102n in advance, multi-polling The information included in the signal 811 can be further reduced. In addition, the length of the communication right period 812 to 817 can be set to a different length according to each wireless communication terminal 102a to 102n.

That is, the multi-polling signal 811 includes, for example,
“Wireless communication terminal 102a” start time α, DOWN
“Wireless communication terminal 102b” start time β, DOWN
...
“Wireless communication terminal 102n” start time γ, UP
As described above, information related to the start time, downlink (DOWN), or uplink (UP) at which the communication right is given to each of the wireless communication terminals 102a to 102n is described. Also, information related to transmission / reception may be described instead of downlink / uplink.

  As a method by which the wireless communication terminal accommodating apparatus 101 assigns the communication right to each of the wireless communication terminals 102a to 102n, for example, as in the first embodiment, for example, the wireless communication terminals 102a to 102a requesting data transmission. There are a method of selectively assigning communication rights to 102n and a method of assigning communication rights to all wireless communication terminals 102a to 102n.

  In the second embodiment, in the method of selectively allocating the communication right to the wireless communication terminals 102a to 102n that request data transmission, the wireless communication terminal accommodating apparatus 101 before the transmission of the multi-polling signal 811 In addition to collecting requests for data transmission from the wireless communication terminals 102a to 102n, it is possible to collect the time required for data transmission or the amount of transmission data from the wireless communication terminals 102a to 102n that request data transmission. desirable. Based on the time required for this data transmission or the amount of transmission data, the wireless communication terminal accommodating apparatus 101 determines the length of the communication right period assigned to each of the wireless communication terminals 102a to 102n, whereby each wireless communication terminal It is possible to efficiently set the communication right period required by 102a to 102n. For example, by setting the maximum length of the communication right period assigned to each of the wireless communication terminals 102a to 102n, it is possible to prevent the assigned communication right period from being extremely biased.

  Further, according to the number of wireless communication terminals 102a to 102n to be accommodated, the number of wireless communication terminals 102a to 102n requesting data transmission, the length of the communication right period requested by the wireless communication terminals 102a to 102n, the amount of transmission data, and the like. The wireless communication terminal accommodating apparatus 101 can also use or combine the above two methods.

After the end of transmission of the multi-polling signal 811, communication is performed according to the communication rights of the wireless communication terminals 102a to 102n assigned by the multi-polling signal 811. In the timing chart shown in FIG. 9, the communication right periods 812 to 814 for the downlink to each of the wireless communication terminals 102a to 102n are continuously defined following the multi-polling signal 811 without providing a no-signal section. After that, the communication right periods 815 to 817 for the uplink from each of the wireless communication terminals 102a to 102n are defined with a predetermined time T _A (<T _P ) sufficiently shorter than the conventional guard time. Embodiments are illustrated. As in the first embodiment, in the communication right periods 812 to 817 assigned to the predetermined wireless communication terminals 102a to 102n, other unauthorized wireless communication terminals 102a to 102n use this transmission medium. It is set so that the used transmission operation cannot be performed.

In particular, in data transmission (downlink) from the wireless communication terminal accommodating apparatus 101 to each of the wireless communication terminals 102a to 102n, as shown in FIG. 9, the wireless communication terminal accommodating apparatus 101 is in each communication right period 812-814. Since it is not necessary to confirm the end of transmission, the communication right periods 812 to 814 can be set continuously without providing a no-signal section for each of the wireless communication terminals 102a to 102n. On the other hand, in data transmission (uplink) from each of the wireless communication terminals 102a to 102n to the wireless communication terminal accommodating apparatus 101, at least a predetermined time T _A <(T _P ) when the communication right period 815 to 817 is shifted. Need to be free.

Incidentally, at the time setting of the communication right time period 815 to 817 defined within multi-polling signal 811, in consideration of the predetermined time T _A, the communication right time period 814 and the communication right period 815 and the communication right time period 815 between ～817 it is also possible to have spaced by a predetermined time T _a, also between the communication right time period 814 and the communication right period 815, and no gaps between the communication right time period 815 to 817, When the wireless communication terminals 102a to 102n start uplink, it is also possible to delay transmission for a predetermined time T _A.

Note that the communication right period of each of the wireless communication terminals 102a to 102n is fixedly determined with the time as a parameter, and, as described in the first embodiment, a predetermined time T _P on the transmission medium. When the above non-signal period occurs, there is a possibility that communication is performed without following the time zone set by the multi-polling signal 811. Accordingly, when the communication right defined by the multi-polling signal 811 is no longer necessary (for example, when data transmission is requested but data transmission is canceled, or communication right is assigned without performing data transmission). ), And even when the desired data transmission is completed in the middle of the communication right period assigned to the own terminal, the wireless communication terminals 102a to 102n are within the communication right period assigned to the own terminal. Some signal needs to be transmitted on the transmission medium so that no signal period longer than time T _P does not occur. The signal transmitted at this time may be an arbitrary signal.

  In this way, when the communication right period 812 to 817 shifts according to the time set by the multi-polling signal 811 and the communication right period 817 of the wireless communication terminal 102n that is set last ends, the wireless communication system again Returns to the distributed control communication method. Note that, for example, when the wireless communication terminal accommodating apparatus 101 transmits a forced termination signal, it is possible to return to the distributed control communication method. Further, after the end of the communication right period 817, the next multi-polling signal 811 may be transmitted again without returning to the distributed control, and the communication method similar to that in FIG.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 10 is a time chart showing communication in the third embodiment of the present invention. In the third embodiment, the multi-polling signal 911 is the same as the information (information regarding the order of communication right periods) included in the multi-polling signal 311 described in the first embodiment and the second embodiment. A multi-polling signal 811 (time of communication right period, information on communication mode), and first, the wireless communication method described in the second embodiment is performed, and then the first implementation The wireless communication method described in the embodiment is implemented. Note that when the wireless communication method described in the second embodiment is shifted to the wireless communication method described in the first embodiment, a predetermined time T _A (which is sufficiently shorter than the conventional guard time). It is possible to move with an interval of <T _P ).

  For example, following the wireless communication method described in the first embodiment, it is not easy to implement the wireless communication method described in the second embodiment. This is because in the wireless communication method described in the first embodiment, each communication right period is not fixed, and the end time of communication by the wireless communication method described in the first embodiment is not determined. . Note that the end time of communication by the wireless communication method described in the first embodiment is forcibly determined, and when the end time comes, the first embodiment is forcibly executed even during communication. If the wireless communication method described in the embodiment is shifted to communication, the wireless communication method described in the second embodiment can be implemented following the wireless communication method described in the first embodiment. .

  Moreover, FIG. 11 is a time chart which shows an example in the case of shifting to the communication method in the first to third embodiments of the present invention. For example, after the wireless communication terminal accommodating apparatus 101 transmits the multi-polling signal 951, the wireless communication terminal accommodating apparatus 101 passes the communication period using an arbitrary communication method, and then the wireless communication terminal accommodating apparatus 101 performs the above first to first timings at an arbitrary timing. When a signal (declaration signal) 961 serving as an index indicating entry into the communication method in the third embodiment is transmitted, the order of transmission rights assigned by the multi-polling signal 951 and the time zone are transmitted after the declaration signal 961. According to the information, any of the communication methods in the first to third embodiments described above can be started.

  In the first to third embodiments, no particular mention is made regarding the directivity of the antenna 11 of the wireless communication terminal accommodating apparatus 101. However, the wireless communication terminal accommodating apparatus 101 has an omnidirectional antenna. The present invention can also be applied to a case where a directional antenna is provided or an antenna capable of forming a directivity is provided.

  FIG. 12 is a schematic diagram showing a case where the wireless communication terminal accommodating apparatus in the first to third embodiments of the present invention has a directional antenna or an antenna that can form a directivity. As shown in FIG. 12, the wireless communication terminal accommodating apparatus 101 has a directional antenna or an antenna that can form a directivity, and is directed to each position of the wireless communication terminals 111a to 111c. When it is possible to define the communication ranges 112a to 112c by control, the wireless communication terminal accommodating apparatus 101 can perform communication simultaneously with the wireless communication terminals 111a to 111c without interference. That is, the communication between the wireless communication terminal accommodating apparatus 101 and each of the wireless communication terminals 111a to 111c is independent of each other without affecting each other, and even in overlapping time zones (same time zone) Communication rights can be assigned to the wireless communication terminals 111a to 111c. Therefore, the wireless communication terminal accommodating apparatus 101 sets the communication right period of each of the wireless communication terminals 111a to 111c to the same time period by the multi-polling signals 811, 911, and 951 that define the communication right period according to the time period. Is possible. In this case, the antennas of the wireless communication terminals 111a to 111c do not need to be directional antennas.

  The wireless communication method and the wireless communication terminal accommodating apparatus of the present invention maintain communication compatibility with a wireless communication system and a wireless communication method using time division multiple access using carrier sense in the conventional multiple access method, while maintaining communication throughput. A wireless communication method in a wireless communication system that transmits and receives data between a plurality of wireless communication terminals using wireless communication, and a plurality of wireless communication terminals in the wireless communication system It is useful as a radio communication terminal accommodating device for accommodating.

The figure which shows the structure of the radio | wireless communications system common to the 1st-3rd embodiment of this invention. The schematic diagram which shows the outline | summary of the communication common to the 1st-3rd embodiment of this invention The block diagram which shows the structure of the radio | wireless communication terminal accommodation apparatus common to the 1st-3rd embodiment of this invention. The time chart which shows the communication in the 1st Embodiment of this invention Time chart showing a mode of communication within the communication right period in the first embodiment of the present invention (A) First of the time chart showing a mode of communication within the communication right period in the first embodiment of the present invention Example (B) Second example of time chart showing a mode of communication within the communication right period in the first embodiment of the present invention Schematic diagram showing an example of a configuration of a wireless communication system according to the first embodiment of the present invention The figure which shows the relationship of the detection of presence of the radio | wireless communication terminals in the radio | wireless communications system shown in FIG. The figure which shows typically the relationship of the presence detection of the radio | wireless communications system in the 1st Embodiment of this invention. Time chart showing communication in the second embodiment of the present invention Time chart showing communication in the third embodiment of the present invention The time chart which shows an example in the case of shifting to the communication method in the 1st-3rd embodiment of this invention The schematic diagram which shows the case where the radio | wireless communication terminal accommodation apparatus in the 1st-3rd embodiment of this invention has a directional antenna, or has an antenna which can form directivity. The figure which shows an example of the structure of the distributed control type in the conventional radio | wireless communications system FIG. 13 is a time chart showing an example of communication performed in the wireless communication system shown in FIG. The figure which shows an example of the structure of the centralized control type in the conventional radio | wireless communications system Time chart showing a first example of communication performed in the wireless communication system shown in FIG. FIG. 15 is a time chart showing a second example of communication performed in the wireless communication system shown in FIG. Schematic diagram showing an example of communication combining conventional distributed control type and centralized control type communication methods

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Antenna 12 Wireless transmission / reception part 13 PHY part 14 DLC part 15 MAC part 16 Scheduler part 101, 1201 Wireless communication terminal accommodation apparatus 102a-102n, 111a-111c, 1001-1004, 1202-1204 Wireless communication terminal 112a-112c Communication range 311 , 811, 911, 951 Multi-polling signal (MultiPoll)
312 to 314, 812 to 817 Communication right period 411a to 411e, 421a to 421c, 1313, 1315 Data signal 412, 422a to 422c, 1316 Confirmation signal 961 Declaration signal 1111 to 1113 Transmission operation period 1311 Indicator signal (beacon signal)
1312, 1317, 1318, 1411 Polling signal (Poll)
1314 Polling reception confirmation signal (Poll confirmation)
1319 End signal 1412 Transmission possible period

Claims (12)

A wireless communication method in a wireless communication system in which one wireless communication terminal accommodating device and a plurality of wireless communication terminals whose communication is controlled by the wireless communication terminal accommodating device communicate with each other via a wireless transmission medium. And
The wireless communication terminal accommodating device determining an order of assignment of communication rights that can occupy the wireless transmission medium for each of the plurality of wireless communication terminals;
The wireless communication terminal accommodating apparatus monitors communication in the wireless transmission medium, and in the communication on the wireless transmission medium, the communication right of the determined communication right is determined at an arbitrary timing when a no-signal time longer than a predetermined length is detected. Bundling information on the order of allocation and transmitting the information to the plurality of wireless communication terminals;
Each of the plurality of wireless communication terminals acquires a communication right in the wireless transmission medium based on the information on the order, and performs communication.
A wireless communication method. A wireless communication method in a wireless communication system in which one wireless communication terminal accommodating device and a plurality of wireless communication terminals whose communication is controlled by the wireless communication terminal accommodating device communicate with each other via a wireless transmission medium. And
The wireless communication terminal accommodating device determining a communication right allocation time zone for allowing the wireless transmission medium to occupy each of the plurality of wireless communication terminals; and
The wireless communication terminal accommodating device determining an order of assignment of communication rights that can occupy the wireless transmission medium for each of the plurality of wireless communication terminals;
The wireless communication terminal accommodating apparatus monitors the communication in the wireless transmission medium, and in the communication on the wireless transmission medium, the time zone and the order at any timing when a no-signal time longer than a predetermined length is detected. And collectively transmitting information on the plurality of wireless communication terminals;
Each of the plurality of wireless communication terminals performs communication by acquiring a communication right in the wireless transmission medium based on the information on the time zone, and subsequently, in the wireless transmission medium based on the information on the order. Acquiring communication right and communicating,
A wireless communication method. When the wireless communication terminal starts communication in the communication right assigned by the order,
Monitoring communication by the wireless communication terminal to which the immediately preceding order is assigned;
In communication by the wireless communication terminal to which the immediately preceding order is assigned, when a no-signal time of a predetermined length or more is detected, it is determined that the period of the communication right is reached, and communication in the communication right is performed. The steps to start,
A wireless communication method according to claim 1 or 2.   4. The method according to claim 1, further comprising a step of transmitting information indicating the end of communication in the communication right when the wireless communication terminal ends communication in the communication right assigned in the order. 5. Wireless communication method.   The wireless communication terminal monitors communication by the wireless communication terminal to which the immediately preceding order is assigned, and information indicating the end of the communication is transmitted from the wireless communication terminal to which the immediately preceding order is assigned. The wireless communication method according to claim 4, further comprising a step of determining that the period of the communication right has been reached when communication is detected and starting communication with the communication right.   Among the communication rights assigned by the order, in the communication rights in the adjacent order, the wireless communication terminal to which the later order is assigned is communicated by the wireless communication terminal to which the previous order is assigned. The wireless communication method according to any one of claims 3 to 5, wherein the wireless communication terminal accommodating apparatus performs the assignment in order. Each of the plurality of wireless communication terminals acquires identification information of other wireless communication terminals capable of monitoring communication;
Each of the plurality of wireless communication terminals has a step of transmitting identification information of other wireless communication terminals acquired by the monitoring to the wireless communication terminal accommodating device,
The wireless communication method according to claim 4, wherein the wireless communication terminal accommodating device performs the order assignment based on the identification information of the other wireless communication terminals received from each of the plurality of wireless communication terminals. A wireless communication method in a wireless communication system in which one wireless communication terminal accommodating device and a plurality of wireless communication terminals whose communication is controlled by the wireless communication terminal accommodating device communicate with each other via a wireless transmission medium. And
The wireless communication terminal accommodating device determining a communication right allocation time zone for allowing the wireless transmission medium to occupy each of the plurality of wireless communication terminals; and
The wireless communication terminal accommodating device monitors communication in the wireless transmission medium, and in the communication on the wireless transmission medium, information on the time zone is detected at an arbitrary timing when a no-signal time longer than a predetermined length is detected. Collectively transmitting to the plurality of wireless communication terminals;
Each of the plurality of wireless communication terminals acquires a communication right in the wireless transmission medium based on information on the time zone, and performs communication.
A wireless communication method.   When communication in all the communication rights assigned to the plurality of wireless communication terminals by the wireless communication terminal accommodating device is completed, the communication mode in the wireless transmission medium is the communication right by the wireless communication terminal accommodating device. The wireless communication method according to claim 1, wherein the wireless communication method returns to the communication mode performed before the assignment. A wireless communication terminal accommodating apparatus that communicates with each of a plurality of wireless communication terminals via a wireless transmission medium and controls communication in each of the plurality of wireless communication terminals,
Means for determining an order of assignment of communication rights that can occupy the wireless transmission medium for each of the plurality of wireless communication terminals;
The communication on the wireless transmission medium is monitored, and in the communication on the wireless transmission medium, the information regarding the order is gathered to the plurality of wireless communication terminals at an arbitrary timing when a no-signal time longer than a predetermined length is detected. Means for transmitting to,
A wireless communication terminal accommodating device that enables each of the plurality of wireless communication terminals to acquire communication rights in the wireless transmission medium and perform communication based on the information on the order. A wireless communication terminal accommodating apparatus that communicates with each of a plurality of wireless communication terminals via a wireless transmission medium and controls communication in each of the plurality of wireless communication terminals,
Means for determining a communication right allocation time zone in which the wireless communication terminal accommodating apparatus can occupy the wireless transmission medium for each of the plurality of wireless communication terminals;
Means for determining an order of assignment of communication rights that can occupy the wireless transmission medium for each of the plurality of wireless communication terminals;
The communication in the wireless transmission medium is monitored, and in the communication on the wireless transmission medium, the information regarding the time zone and the order is collected at an arbitrary timing when a no-signal time of a predetermined length or more is detected. Means for transmitting to a wireless communication terminal,
Each of the plurality of wireless communication terminals performs communication by acquiring a communication right in the wireless transmission medium based on the information on the time zone, and subsequently, in the wireless transmission medium based on the information on the order. A wireless communication terminal accommodating apparatus that enables communication by acquiring a communication right. A wireless communication terminal accommodating apparatus that communicates with each of a plurality of wireless communication terminals via a wireless transmission medium and controls communication in each of the plurality of wireless communication terminals,
Means for determining a time slot for assigning communication rights that can occupy the wireless transmission medium for each of the plurality of wireless communication terminals;
The plurality of wireless communication terminals that monitor communication in the wireless transmission medium and collect information related to the time zone at an arbitrary timing when a no-signal time longer than a predetermined length is detected in the communication on the wireless transmission medium Means for transmitting to
A wireless communication terminal accommodating apparatus that enables each of the plurality of wireless communication terminals to perform communication by acquiring a communication right in the wireless transmission medium based on information on the time zone.