JP4862417B2 - access point - Google Patents

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JP4862417B2
JP4862417B2 JP2006030893A JP2006030893A JP4862417B2 JP 4862417 B2 JP4862417 B2 JP 4862417B2 JP 2006030893 A JP2006030893 A JP 2006030893A JP 2006030893 A JP2006030893 A JP 2006030893A JP 4862417 B2 JP4862417 B2 JP 4862417B2
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wireless lan
attribution
reservation
lan terminal
number
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JP2007214760A (en
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直克 横坂
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株式会社ナカヨ通信機
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Description

  The present invention relates to an access point that performs wireless communication based on a wireless LAN standard.

  Wireless LAN systems based on standards such as IEEE 802.11a and IEEE 802.11b are known. In such a wireless LAN system, there is a method in which each wireless LAN terminal communicates with each other via a relay station called an access point. In such a system, when the number of wireless LAN terminals belonging to one access point increases, the communication band that can be allocated to each wireless LAN terminal becomes narrow, and the effective communication speed may decrease.

  Such a situation is particularly problematic in the case of voice communication such as VoIP and communication that requires relatively real-time properties such as streaming delivery of video and the like, because the voice and video are interrupted.

  In order to avoid this, for example, in Patent Document 1, the maximum number of wireless LAN terminals that can belong to one access point is set in advance as the access point, and the access point receives an attribution request from the wireless LAN terminal. In this case, only when the number of wireless LAN terminals currently belonging to the access point is less than a predetermined maximum number that can be assigned, the wireless LAN terminal is allowed to belong to each wireless LAN terminal. A technique for guaranteeing required communication quality is disclosed.

JP 2004-48250 A

  By the way, as the wireless LAN terminal moves, it may be handed over to another access point, or moved to an area where it is not possible to receive radio waves of sufficient quality for communication from any access point. May go out of the area where communication with the access point to which it currently belongs is possible. In this case, in the technique described in Patent Document 1, the access point reduces the number of wireless LAN terminals to which it currently belongs by one.

  For example, when one wireless LAN terminal moves out of the communication area of the access point to which the wireless LAN terminal belongs to the limit number, the access point is newly connected to one wireless LAN. A LAN terminal can be assigned. Then, when another wireless LAN terminal moves to the vicinity of the access point and transmits an attribution request to the access point, the access point newly permits the attribution of the wireless LAN terminal, and again, the wireless devices of the limited number The LAN terminal will belong.

  After that, when a wireless LAN terminal that has moved out of the communicable area of the access point returns again, another wireless LAN terminal has already belonged to the access point up to the limit number, and the access point Can't belong again. For this reason, the wireless LAN terminal that has moved back from the communicable area of the access point and returned may not be able to belong to the access point again.

  For example, a sales department employee who uses a wireless LAN telephone as a wireless LAN terminal responds to an incoming call from a customer at his / her desk and then puts the call on hold (for example, using the technology defined in RFC3981). Hold the system hold), move to the warehouse where the access point's radio wave does not reach with the wireless LAN phone, go back to your desk again, release the hold and answer the phone May continue. In such a case, with the technique described in Patent Document 1 above, even if the employee returns to his / her desk, the wireless LAN telephone may not be able to belong to the original access point again. Can not continue to be a problem.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to return to the communicable area of the access point after moving out of the communicable area of the access point to which the wireless LAN terminal belongs. The wireless LAN terminal can reliably belong to the access point.

  In order to solve the above-described problem, the access point of the present invention limits the number of wireless LAN terminals that can be attributed to a predetermined maximum number that can be attributed and receives a reservation command from a subordinate wireless LAN terminal. A re-assignable frame to which only the wireless LAN terminal can belong is provided within the maximum number of assignable units.

For example, the present invention is an access point used in a wireless LAN system having a wireless LAN terminal,
Reservation period storage means for storing a reservation period, which is a period during which wireless LAN terminal attribution is permitted, in association with identification information of the permitted wireless LAN terminal;
Belonging number storage means for storing the number of wireless LAN terminals currently belonging;
Reservation command reception for storing the reservation period in the reservation period storage unit in association with the identification information of the wireless LAN terminal when a reservation command including the identification information of the wireless LAN terminal is received from the belonging wireless LAN terminal Means,
Referring to the reservation period storage means, after the reservation period stored in the reservation period storage means has elapsed , the number of wireless LAN terminals stored in the belonging number storage means is reduced by 1 and corresponding A reservation period deleting means for deleting the reservation period and the identification information associated with the reservation period;
When an attribution request is received from a wireless LAN terminal, referring to the reservation period storage means,
If the identification information of the wireless LAN terminal that transmitted the attribution request is stored in the reservation period storage means, the attribution number is increased without increasing the number of wireless LAN terminals stored in the attribution number storage means. Execute attribution processing with the wireless LAN terminal that sent the request,
If the identification information of the wireless LAN terminal that transmitted the attribution request is not stored in the reservation period storage means, refer to the attribution number storage means,
If the number of wireless LAN terminals currently belonging is less than the maximum number of wireless LAN terminals that can be simultaneously attributed, the number of wireless LAN terminals stored in the belonging number storage means is increased by one. Together with the wireless LAN terminal that transmitted the attribution request,
If the number of wireless LAN terminals currently attributed is equal to or greater than the maximum attribute number, an attribution processing means for rejecting attribution of the wireless LAN terminal that transmitted the attribution request ,
The attribution processing means is
When receiving an attribution cancellation request from the currently belonging wireless LAN terminal, refer to the reservation period storage means,
If the identification information of the wireless LAN terminal that transmitted the attribution cancellation request is stored in the reservation period storage means, the number of wireless LAN terminals stored in the attribution number storage means is not reduced by 1, Execute the attribution cancellation process with the wireless LAN terminal that sent the attribution cancellation request,
If the identification information of the wireless LAN terminal that transmitted the attribution cancellation request is not stored in the reservation period storage means, the number of wireless LAN terminals stored in the attribution number storage means is reduced by 1, and the attribution information the release request to provide an access point which is characterized that you run attribution cancellation processing with the transmitted wireless LAN terminal.

  According to the access point of the present invention, when a subordinate wireless LAN terminal moves outside the communicable area of the access point and then returns to the communicable area of the access point, the wireless LAN terminal is securely connected. Can be attributed.

  Embodiments of the present invention will be described below.

  FIG. 1 shows a system configuration of a wireless LAN system 10 according to an embodiment of the present invention. The wireless LAN system 10 includes a plurality of wireless LAN terminals 20 and a plurality of access points 30.

  Each access point 30 is connected to the wired LAN 11, performs wireless communication with each wireless LAN terminal 20 based on a wireless LAN standard such as IEEE802.11a or IEEE802.11b, and via the wired LAN 11. Wired communication is performed with the SIP server 12 and other communication devices 13 connected to the wired LAN 11 based on a communication standard such as Ethernet (registered trademark). Each access point 30 may communicate with the communication device 13 connected to the external network via an external network such as the Internet connected to the wired LAN 11. The wired LAN 11 may be a wireless communication network of a wireless communication method different from that of the wireless LAN terminal 20.

  Each access point 30 limits the number of wireless LAN terminals 20 that can be simultaneously attributed to within the maximum number that can be attributed, which is a predetermined number. In this example, for each access point 30, for example, a value of 6 is set as the maximum assignable number. Note that in this example, the maximum possible number of belongings is the number of wireless LAN terminals 20 to which the access point 30 is allowed to belong to the access point 30 regardless of whether it is communicating or waiting. Point to.

  As a result, each access point 30 increases in the number of wireless LAN terminals 20 belonging to one access point 30, thereby reducing the communication band allocated to each wireless LAN terminal 20 and improving real-time performance. This prevents the transmission of necessary audio and moving images.

  As another example, each access point 30 does not include the number of standby wireless LAN terminals 20 in the maximum number of assignable units, but includes the number of wireless LAN terminals 20 in communication in the maximum number of assignable units. You may do it. Further, in this example, the same maximum assignable number is set for each access point 30, but as another example, different maximum assignable numbers may be set for each access point 30. Good.

  Each wireless LAN terminal 20 belongs to, for example, the access point 30 with the best received signal quality, performs wireless communication based on the wireless LAN with the access point 30, and belongs to the access point 30 via the access point 30. It communicates with other wireless LAN terminals 20 that are connected, other wireless LAN terminals 20 that belong to other access points 30, the SIP server 12 connected to the wired LAN 11, the communication device 13, and the like.

  In this example, the wireless LAN terminal 20 is a voice communication terminal, and performs voice communication with the SIP server 12 and the communication device 13 based on, for example, SIP (Session Initiation Protocol). As another example, the wireless LAN terminal 20 may be a communication terminal that transmits / receives data other than voice data, or both voice data and data other than voice data.

  Here, as shown in FIG. 1, when the maximum number of wireless LAN terminals 20 that can be attributed (six) belong to the access point 30-1, the wireless LAN terminal 20- that is one of the wireless LAN terminals 20- 2 moves outside the communicable area 14-1 of the access point 30-1, the access point 30-1 can newly belong to one wireless LAN terminal 20. At this time, if the wireless LAN terminal 20-1 moves into the communicable area 14-1 of the access point 30-1 and transmits an attribution request to the access point 30-1, the attribution of the wireless LAN terminal 20-1 is permitted. May be.

  Then, even if the wireless LAN terminal 20-2 returns from outside the communicable area 14-1 of the access point 30-1 to the communicable area 14-1, and transmits an attribution request to the access point 30-1, Since the access point 30-1 has already permitted the attribution of the number of wireless LAN terminals 20 that can be attributed, the access point 30-1 rejects the attribution of the wireless LAN terminal 20-2. Therefore, in this case, the wireless LAN terminal 20-2 cannot belong again to the access point 30-1.

  Further, as shown in FIG. 1, the wireless LAN terminal 20-3 is located outside the communicable area 14-1 from the communicable area 14-1 of the access point 30-1 to which it belongs, and other access points. After moving into the communicable area 14-2 of 30-2 and changing the attribution from the access point 30-1 to the access point 30-2, so-called handover, the mobile terminal returns to the communicable area 14-1 again. In some cases, the same problem as described above occurs.

  In order to avoid this, in the present invention, when the wireless LAN terminal 20 receives a predetermined key operation from the user within the communicable area 14 of the access point 30, the wireless LAN terminal 20 moves to the access point 30 to which it belongs. A reservation command is sent to the effect that only the own wireless LAN terminal 20 can be reattached within the maximum number of reassignable frames. The access point 30 that has received the reservation command executes the belonging process for the wireless LAN terminal 20 that has transmitted the reservation command for a predetermined period regardless of the number of wireless LAN terminals 20 currently belonging.

  Accordingly, when the wireless LAN terminal 20 moves out of the communicable area 14 of the access point 30 to which the wireless LAN terminal 20 belongs, and returns to the communicable area of the access point 30, the wireless LAN terminal 20 The point 30 can be reliably attributed.

  Hereinafter, a specific configuration of the wireless LAN system 10 for realizing the above functions will be described in detail.

  FIG. 2 shows an example of a detailed functional configuration of the wireless LAN terminal 20. The wireless LAN terminal 20 includes a notification unit 200, an operation key 201, a reservation period management unit 202, an attribution processing unit 203, an in-area determination unit 204, a command transmission unit 205, a key operation detection unit 206, and a wireless communication unit 207.

  The wireless communication unit 207 performs wireless communication with the access point 30 based on the wireless LAN. The in-area determination unit 204 measures the received signal quality from the access point 30 via the wireless communication unit 207. Then, when a signal of sufficient quality for communication is received from the access point 30, the in-area determination unit 204 determines that the own wireless LAN terminal 20 is located in the communicable area 14 of the access point 30. It is determined that In addition, when the in-area determination unit 204 determines that the own wireless LAN terminal 20 is located in the communicable area 14 of the access point 30, the identification information (ID) of the access point 30 is output together with that fact. To do.

  The attribution processing unit 203 is located in the communicable area 14 after the in-area determination unit 204 determines that the own wireless LAN terminal 20 is located outside the communicable area 14 of the access point 30. When the determination is made, the attribution process is automatically executed with the access point 30 via the wireless communication unit 207.

  The operation key 201 receives a key operation from the user of the wireless LAN terminal 20. When the key operation received via the operation key 201 is an operation for instructing transmission of a reservation command, the key operation detection unit 206 instructs the command transmission unit 205 to transmit the reservation command together with designation of the reservation period. When the key operation received by the operation key 201 is an operation for instructing transmission of a cancellation command for instructing cancellation of the transmitted reservation command, the key operation detection unit 206 sends the transmission of the cancellation command to the command transmission unit 205. Instruct.

  FIG. 3 shows an example of an overview of the wireless LAN terminal 20. For example, when the reservation button 42 is pressed, the key operation detection unit 206 transmits a reservation command that specifies, for example, 1 minute as a reservation period. The unit 205 is instructed. Further, for example, when the reservation button 42 is pressed a plurality of times within a predetermined time, the key operation detection unit 206 transmits a reservation command that designates a period obtained by multiplying the number of times pressed by, for example, 1 minute as a reservation period. The unit 205 is instructed.

  In addition, when the reservation button 42 is pressed after the numeric key 44 is pressed, the key operation detection unit 206 specifies a period obtained by multiplying the numerical value indicated by the pressed numeric key 44 by 1 minute as a reservation period. Command transmission unit 205 is instructed to transmit a command. For example, when the number key 44 corresponding to “2” is pressed after the number key 44 corresponding to “1” is pressed, and then the reservation button 42 is pressed, the key operation detection unit 206 performs the 12-minute operation. The command transmission unit 205 is instructed to transmit a reservation command that specifies a reservation period.

  When the reservation cancel button 43 shown in FIG. 3 is pressed, the key operation detection unit 206 instructs the command transmission unit 205 to transmit a cancel command. The wireless LAN terminal 20 may be provided with a hold button (not shown), and the reservation command described above may be transmitted when the hold button is pressed. Furthermore, the release command described above may be transmitted when the hold button is pressed again (hold release).

  In FIG. 2, when the command transmission unit 205 is instructed by the key operation detection unit 206 to transmit a reservation command together with a reservation period, a command including a terminal ID for identifying the own wireless LAN terminal 20 and a reservation period is received. The data is transmitted to the access point 30 belonging to the wireless communication unit 207 and the reservation period management unit 202 is notified of the reservation period.

  Further, when the command transmission unit 205 is instructed by the key operation detection unit 206 to transmit a release command, the in-area determination unit 204 locates its own wireless LAN terminal 20 within the communicable area 14 of the access point 30. If it is determined, the cancel command including the terminal ID is transmitted to the belonging access point 30 via the wireless communication unit 207, and the reservation period management unit 202 is notified that the reservation has been canceled. .

  On the other hand, when the key operation detection unit 206 is instructed to transmit the release command, the in-area determination unit 204 does not determine that the own wireless LAN terminal 20 is located in the communicable area 14 of the access point 30. Then, the command transmission unit 205 instructs the notification unit 200 to notify an error.

  When the reservation period is notified from the command transmission unit 205, the reservation period management unit 202 uses the timer built in the wireless LAN terminal 20 to start measuring the notified reservation period. When the reservation period management unit 202 detects the expiration of the reservation period, the reservation period management unit 202 notifies the notification unit 200 to that effect. On the other hand, if the command transmission unit 205 notifies the reservation period to expire before the expiration of the reservation period, the reservation period management unit 202 stops measuring the reservation period.

  The notification unit 200 notifies the user when the reservation period management unit 202 is notified of the expiration of the reservation period, or when an error notification is instructed from the command transmission unit 205. For example, as illustrated in FIG. 3, the notification unit 200 notifies the user of the expiration of the reservation period or an error by generating a beep sound from the speaker 40 or displaying a message on the display screen 41. As another example, the notification unit 200 may notify the user of the remaining period of the reservation period managed by the reservation period management unit 202.

  FIG. 4 shows an example of a detailed functional configuration of the access point 30. The access point 30 includes a wired communication unit 300, a reservation permission terminal information storage unit 301, a command reception unit 302, an end time deletion unit 303, a wireless communication unit 304, an end time storage unit 305, an affiliated number storage unit 306, and an attribution processing unit. 307.

  The wired communication unit 300 performs wired communication with the SIP server 12, the communication device 13, and other access points 30 via the wired LAN 11 based on a communication standard such as Ethernet (registered trademark). The wireless communication unit 304 performs wireless communication with each wireless LAN terminal 20 based on a wireless LAN standard such as IEEE802.11a or IEEE802.11b.

  The reservation permission terminal information storage unit 301 stores in advance the terminal ID of the wireless LAN terminal 20 that is permitted to execute the process according to the reservation command. The end time storage unit 305 stores the end time of the reservation period in association with the terminal ID of each wireless LAN terminal 20, for example, in a data structure as shown in FIG. The belonging number storage unit 306 stores the number of the wireless LAN terminals 20 to which it currently belongs.

  When receiving a reservation command from the wireless LAN terminal 20 via the wireless communication unit 304, the command receiving unit 302 refers to the reservation-permitted terminal information storage unit 301 based on the terminal ID included in the received reservation command. Then, when the terminal ID included in the reservation command is stored in the reservation permission terminal information storage unit 301, the command reception unit 302 calculates the end time of the reservation period based on the reservation period included in the reservation command. The calculated end time is stored in the end time storage unit 305 in association with the terminal ID included in the reservation command.

  When receiving a release command from the wireless LAN terminal 20 via the wireless communication unit 304, the command receiving unit 302 refers to the end time storage unit 305 based on the terminal ID included in the received release command. When the terminal ID included in the release command is stored in the end time storage unit 305, the command reception unit 302 deletes the terminal ID and the end time corresponding to the terminal ID from the end time storage unit 305. .

  The end time deletion unit 303 refers to the end time storage unit 305 and determines whether any of the end times stored in the end time storage unit 305 matches the current time. When an end time that matches the current time is detected, the end time deletion unit 303 deletes the end time and the terminal ID corresponding to the end time from the end time storage unit 305, and deletes the deleted terminal ID. Notify the attribution processing unit 307.

  In this example, if the difference between any of the end times stored in the end time storage unit 305 and the current time is within one minute, for example, the end time deleting unit 303 determines that the end time and the current time are It is determined that they match.

  When the attribution processing unit 307 receives an attribution request including the terminal ID of the wireless LAN terminal 20 via the wireless communication unit 304, the attribution processing unit 307 refers to the end time storage unit 305 and determines that the terminal ID included in the attribution request is It is determined whether it is stored in the end time storage unit 305. When the terminal ID is stored in the end time storage unit 305, the attribution processing unit 307 deletes the terminal ID and the corresponding end time from the end time storage unit 305, and via the wireless communication unit 304. Then, the attribution process is executed with the wireless LAN terminal 20 that has transmitted the attribution request.

  On the other hand, when the terminal ID included in the received attribution request is not stored in the end time storage unit 305, the attribution processing unit 307 refers to the attribution number storage unit 306 and determines the number of wireless LAN terminals 20 that are belonging. Is less than a preset maximum number of belongings (6 in this example).

  When the number of belonging wireless LAN terminals 20 is less than the maximum number that can be attributed, the attribution processing unit 307 performs attribution processing with the wireless LAN terminal 20 that transmitted the attribution request via the wireless communication unit 304. To do. As a result of the attribution process, when the attribution is permitted, the attribution processing unit 307 transmits an attribution permission response to the wireless LAN terminal 20 via the wireless communication unit 304 and is stored in the attribution number storage unit 306. The number of belonging wireless LAN terminals 20 is increased by one.

  When the number of belonging wireless LAN terminals 20 is equal to or greater than the maximum number that can be attributed, or when attribution is not permitted as a result of the attribution process, the attribution processing unit 307 transmits the attribution request via the wireless communication unit 304. The attribution of the wireless LAN terminal 20 is rejected by transmitting an attribution rejection response to the wireless LAN terminal 20 that has been transmitted.

  When the attribution processing unit 307 receives an attribution cancellation request from the belonging wireless LAN terminal 20, the attribution processing unit 307 refers to the end time storage unit 305, and the terminal ID included in the attribution cancellation request is stored in the termination time storage unit 305. It is determined whether it is stored. If the terminal ID included in the attribution release request is not stored in the end time storage unit 305, the attribution processing unit 307 stores the number of wireless LAN terminals 20 that belong to the affiliated number storage unit 306. Decrease by 1. On the other hand, when the terminal ID is stored in the end time storage unit 305, the attribution processing unit 307 performs a process of reducing the number of belonging wireless LAN terminals 20 stored in the attribution number storage unit 306 by one. Do not execute.

  FIG. 6 is a flowchart showing an example of the operation of the wireless LAN terminal 20. For example, at a predetermined timing such as power-on, the wireless LAN terminal 20 starts the operation shown in this flowchart.

  First, the key operation detection unit 206 determines whether or not the key operation received via the operation key 201 is an operation for instructing transmission of a reservation command (S100). When the key operation is not a reservation command transmission instruction (S100: No), the key operation detection unit 206 repeats Step 100 until a reservation command transmission instruction is received.

  When the key operation is a reservation command transmission instruction (S100: Yes), the key operation detection unit 206 instructs the command transmission unit 205 to transmit the reservation command together with the designation of the reservation period. Then, the command transmission unit 205 determines whether or not the own wireless LAN terminal 20 is located in the communicable area 14 of the access point 30 based on the determination result from the in-area determination unit 204 (S101).

  When the own wireless LAN terminal 20 is not located in the communicable area 14 of the access point 30 (S101: No), the command transmission unit 205 notifies the user of an error via the notification unit 200 (S114), and the key The operation detection unit 206 executes the process shown in step 100 again.

  When the own wireless LAN terminal 20 is located in the communicable area 14 of the access point 30 (S101: Yes), the command transmission unit 205 wirelessly transmits a reservation command including the terminal ID of the own wireless LAN terminal 20 and a reservation period. The information is transmitted to the access point 30 belonging to it via the communication unit 207, and the reservation period is notified to the reservation period management unit 202 (S102).

  Then, the reservation period management unit 202 starts measuring the reservation period (S103). Then, the command transmission unit 205 stores the ID of the access point 30 that is the transmission destination of the reservation command (S104).

  Next, the command transmission unit 205 refers to the determination result from the in-area determination unit 204, and whether or not the own wireless LAN terminal 20 has moved outside the communicable area 14 of the access point 30 to which the reservation command is transmitted. Is determined (S105). When the own wireless LAN terminal 20 moves out of the communicable area 14 of the access point 30 to which the reservation command is transmitted (S105: Yes), the reservation period management unit 202 determines whether or not the reservation period has expired. (S106).

  When the reservation period has expired (S106: Yes), the reservation period management unit 202 notifies the user of the wireless LAN terminal 20 via the notification unit 200 (S107). Then, the reservation period management unit 202 ends the measurement of the reservation period (S115), and the key operation detection unit 206 executes the process shown in step 100 again.

  When the reservation period has not expired (S106: No), the command transmission unit 205 refers to the determination result from the in-area determination unit 204, and the own wireless LAN terminal 20 determines that the reservation command transmission destination access point 30 It is determined whether or not the communication area 14 has been returned (S108). When the own wireless LAN terminal 20 has not returned to the communicable area 14 of the access point 30 to which the reservation command is transmitted (S108: No), the reservation period management unit 202 executes the process shown in step 106 again. .

  When the own wireless LAN terminal 20 returns to the communicable area 14 of the access point 30 to which the reservation command is transmitted (S108: Yes), the attribution processing unit 203 transmits an attribution request to the access point 30. The attribution process is started, the command transmission unit 205 causes the reservation period management unit 202 to finish measuring the reservation period (S109), and the key operation detection unit 206 executes the process shown in step 100 again.

  In step 105, if the own wireless LAN terminal 20 has not moved outside the communicable area 14 of the access point 30 to which the reservation command is transmitted (S105: No), the reservation period management unit 202 has expired the reservation period. It is determined whether or not (S110). When the reservation period has expired (S110: Yes), the reservation period management unit 202 executes the processing shown in step 107.

  When the reservation period has not expired (S110: No), the key operation detection unit 206 determines whether or not a key operation for instructing cancellation of the transmitted reservation command has been received via the operation key 201 (S111). . When the key operation for instructing the cancellation of the transmitted reservation command is not received (S111: No), the command transmission unit 205 executes the process shown in step 105 again.

  When a key operation for instructing the cancellation of the transmitted reservation command is received (S111: Yes), the command transmission unit 205 transmits a cancellation command including the terminal ID to the access point 30 belonging to it via the wireless communication unit 207. In step S112, the reservation period management unit 202 is notified that the reservation has been canceled. Then, the reservation period management unit 202 ends the measurement of the reservation period (S113), and the key operation detection unit 206 executes the process shown in step 100 again.

  FIG. 7 is a flowchart showing an example of the operation of the access point 30. For example, the access point 30 starts the processing shown in this flowchart at a predetermined timing such as when the power is turned on.

  First, the attribution processing unit 307 determines whether an attribution request has been received (S200). When the attribution request is received (S200: Yes), the attribution processing unit 307 refers to the end time storage unit 305 and determines whether or not the terminal ID included in the received attribution request is stored in the end time storage unit 305. Is determined (S201).

  When the terminal ID included in the received attribution request is stored in the end time storage unit 305 (S201: Yes), the attribution processing unit 307 deletes the terminal ID and the corresponding end time from the end time storage unit 305. (S202). Then, the attribution processing unit 307 executes attribution processing with the wireless LAN terminal 20 that has transmitted the attribution request (S203), and determines whether or not the attribution is permitted (S204).

  When the attribution is permitted (S204: Yes), the attribution processing unit 307 transmits an attribution permission response to the wireless LAN terminal 20 (S205), and executes the process shown in step 200 again. On the other hand, when the attribution is not permitted (S204: No), the attribution processing unit 307 transmits an attribution rejection response to the wireless LAN terminal 20 (S210), and executes the process shown in step 200 again.

  When the terminal ID included in the received attribution request is not stored in the end time storage unit 305 (S201: No), the attribution processing unit 307 refers to the attribution number storage unit 306, and belongs to the wireless LAN terminal that is belonging It is determined whether or not the number of 20 is less than a preset maximum attribution possible number (6 in this example) (S206).

  If the number of wireless LAN terminals 20 that belong is equal to or greater than the maximum number that can be attributed (S206: No), the attribution processing unit 307 executes the processing shown in step 210. On the other hand, when the number of belonging wireless LAN terminals 20 is less than the maximum assignable number (S206: Yes), the attribution processing unit 307 performs attribution processing with the wireless LAN terminal 20 that has transmitted the attribution request. It is executed (S207), and it is determined whether or not attribution is permitted (S208).

  When the attribution is permitted (S207: Yes), the attribution processing unit 307 transmits an attribution permission response to the wireless LAN terminal 20, and the number of the wireless LAN terminals 20 that are belonging, which is stored in the attribution number storage unit 306. Is incremented by 1 (S209), and the process shown in step 200 is executed again. On the other hand, when the attribution is not permitted (S208: No), the attribution processing unit 307 executes the processing shown in step 210.

  In step 200, when the attribution request has not been received (S200: No), the attribution processing unit 307 determines whether an attribution cancellation request has been received (S211). When the attribution cancellation request is received (S211: Yes), the attribution processing unit 307 refers to the end time storage unit 305, and the terminal ID included in the received attribution cancellation request is stored in the end time storage unit 305. It is determined whether or not there is (S212).

  When the terminal ID included in the received attribution release request is not stored in the end time storage unit 305 (S212: No), the attribution processing unit 307 stores the currently belonging attribute stored in the attribution number storage unit 306. The number of wireless LAN terminals 20 is reduced by 1 (S213), and the process shown in step 200 is executed again. On the other hand, when the terminal ID included in the received attribution cancellation request is stored in the end time storage unit 305 (S212: Yes), the attribution processing unit 307 performs no processing on the attribution cancellation request. Without doing so, the processing shown in step 200 is executed again.

  If no attribution cancellation request has been received (S211: No), the command receiving unit 302 determines whether a reservation command has been received (S214). When the reservation command is received (S214: Yes), the command reception unit 302 refers to the reservation permission terminal information storage unit 301 based on the terminal ID included in the received reservation command, and the terminal ID stores the reservation permission terminal information. It is determined whether it is stored in the unit 301 (S215).

  When the terminal ID included in the reservation command is not stored in the reservation permission terminal information storage unit 301 (S215: No), the attribution processing unit 307 executes the process shown in step 200 again. When the terminal ID included in the reservation command is stored in the reservation permission terminal information storage unit 301 (S215: Yes), the command reception unit 302 sets the end time of the reservation period based on the reservation period included in the reservation command. The calculated end time is stored in the end time storage unit 305 in association with the terminal ID included in the reservation command (S216), and the attribution processing unit 307 executes the process shown in step 200 again.

  In step 214, when the reservation command has not been received (S214: No), the command reception unit 302 determines whether or not a release command has been received (S217). When the cancellation command is received (S217: Yes), the command reception unit 302 refers to the end time storage unit 305 based on the terminal ID included in the received cancellation command, and the terminal ID included in the cancellation command stores the end time. If it is stored in the unit 305, the terminal ID and the end time corresponding to the terminal ID are deleted from the end time storage unit 305 (S218), and the attribution processing unit 307 performs the process shown in step 200 again. Execute.

  When the cancel command has not been received (S217: No), the end time deletion unit 303 refers to the end time storage unit 305, and any of the end times stored in the end time storage unit 305 is the current time. It is determined whether or not (S219). When the end time that matches the current time is not stored in the end time storage unit 305 (S219: No), the attribution processing unit 307 executes the process shown in step 200 again.

  When the end time that matches the current time is stored in the end time storage unit 305 (S219: Yes), the end time deletion unit 303 sets the end time and the terminal ID corresponding to the end time to the end time storage unit. It deletes from 305 (S220), and notifies the attribution processing unit 307 of the deleted terminal ID. And then. The attribution processing unit 307 determines whether or not the wireless LAN terminal 20 corresponding to the terminal ID notified from the end time storage unit 305 belongs to the own access point 30 (S221).

  When the wireless LAN terminal 20 corresponding to the deleted terminal ID does not belong to the own access point 30 (S221: No), the attribution processing unit 307 is stored in the belonging number storage unit 306 and is currently belonging. The number of wireless LAN terminals 20 is reduced by 1 (S221), and the process shown in step 200 is executed again. On the other hand, when the wireless LAN terminal 20 corresponding to the deleted terminal ID is belonging to the own access point 30 (S221: Yes), the attribution processing unit 307 executes the process shown in step 200 again.

  The embodiment of the present invention has been described above.

  As is clear from the above description, according to the access point 30 of this embodiment, after the subordinate wireless LAN terminal 20 moves out of the communicable area 14 of the access point 30, the communicable area 14 of the access point 30 is obtained. When it comes back in, the wireless LAN terminal 20 can be reliably attributed.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, if a wireless LAN terminal 20 receives an instruction to hold a system (for example, using a technology defined in RFC3981) from a user during voice communication based on SIP, the wireless LAN terminal 20 executes a system holding process and makes a reservation. The command may be transmitted to the belonging access point 30.

  FIG. 8 is a sequence diagram illustrating an example of the operation of the wireless LAN system 10 when a reservation command is transmitted when the system hold process is executed.

  First, the wireless LAN terminal 20 performs voice communication based on SIP with the communication device 13 via the access point 30 to which it belongs (S300). Upon receiving a system hold instruction from the user (S301), the wireless LAN terminal 20 uses the REFER method in which the SIP URI of the SIP server 12 is described in the Refer-To header via the access point 30, and the communication device 13 of the communication partner. To the communication partner 13 is instructed to hold (S302).

  The communication device 13 changes the communication partner from the wireless LAN terminal 20 to the SIP server 12, and enters the system hold state (S303). Then, the wireless LAN terminal 20 reserves reassignment of the wireless LAN terminal 20 by transmitting a reservation command to the access point 30 (S304). Then, the wireless LAN terminal 20 cancels the attribution to the access point 30 by transmitting the attribution cancellation request (S305).

  Next, after the wireless LAN terminal 20 moves out of the communicable area 14 of the access point 30, the wireless LAN terminal 20 returns to the communicable area 14 and transmits an attribution request to the access point 30. Attribution processing is executed (S306). At this time, since the attribution of the wireless LAN terminal 20 is reserved in step 304, the wireless LAN terminal 20 can surely belong to the access point 30.

  When the wireless LAN terminal 20 receives an instruction to release the system hold from the user (S307), the wireless LAN terminal 20 transmits an INVITE request in which the SIP URI is set in the Replaces header to the communication device 13 on hold, thereby transmitting the communication device. 13 is instructed to cancel the hold (S308). Then, the wireless LAN terminal 20 and the communication device 13 resume the call (S309).

  In the embodiment described above, the reservation period is included in the reservation command, but as another example, the command receiving unit 302 is uniform for any wireless LAN terminal 20 when the reservation command is received. A reservation period may be set. Further, when a reservation period that is different for each wireless LAN terminal 20 is determined in advance and a reservation command is received, a predetermined reservation period may be applied according to the terminal ID included in the reservation command.

  In the above-described embodiment, the access point 30 provides a re-attributable frame that can be attributed only to the wireless LAN terminal 20 that has transmitted the reservation command, within the maximum number that can be attributed for the reservation period. When the reservation command is received, the wireless LAN terminal 20 that transmitted the reservation command belongs again without setting the end time, or until the cancel command is received from the wireless LAN terminal 20 that transmitted the reservation command. Further, a re-assignable frame that only the wireless LAN terminal 20 that has transmitted the reservation command can belong to may be provided within the maximum number that can be assigned.

  In the above-described embodiment, the access point 30 registers the identification information of the wireless LAN terminal 20 that transmitted the reservation command and the end time of the reservation period in the end time storage unit 305 and is registered in the end time storage unit 305. When the belonging wireless LAN terminal 20 cancels the belonging to itself, the number of wireless LAN terminals 20 currently belonging to the wireless LAN terminal 20 is not reduced by one even though the belonging is released, so that the wireless LAN terminal 20 However, the present invention is not limited to this.

  For example, the access point 30 registers the identification information of the wireless LAN terminal 20 that has transmitted the reservation command and the end time of the reservation period in the end time storage unit 305 and newly adds one piece of identification information to the end time storage unit 305. When is registered, the maximum number of belongings can be reduced by one. When the wireless LAN terminal 20 attempts to re-associate with the access point, the access point 30 is currently belonging when the identification information of the wireless LAN terminal 20 is registered in the end time storage unit 305. Regardless of whether or not the number of wireless LAN terminals 20 is less than the maximum attributeable number, the attribution process is executed with the wireless LAN terminal 20.

  On the other hand, when the identification information of the wireless LAN terminal 20 is not stored in the end time storage unit 305, the access point 30 is in the state where the number of wireless LAN terminals 20 currently belonging is less than the maximum number of belongings. The attribution process is executed with the wireless LAN terminal 20. Even with such a configuration, the access point 30 can reliably execute re-assignment of the wireless LAN terminal 20 that has transmitted the reservation command for the reservation period corresponding to the reservation command.

  In the above-described embodiment, after the wireless LAN terminal 20 transmits the reservation command, the wireless LAN terminal 20 moves out of the area of the access point 30 to which the reservation command is transmitted, returns to the area, and belongs to the access point 30 again. When the request is transmitted, the access point 30 deletes the end time set by the reservation command from the wireless LAN terminal 20 from the end time storage unit 305. As another example, the access point 30 The end time may not be deleted until the end time has passed. Thus, the wireless LAN terminal 20 can recursively belong to the access point 30 that is the destination of the reservation command again and again without transmitting the reservation command again during the period once reserved by the reservation command.

  In the embodiment described above, the access point 30 manages the reservation period of the wireless LAN terminal 20 that has transmitted the reservation command by managing the end time. As another example, the access point 30 may It is also possible to manage the reservation period of the wireless LAN terminal 20 that has transmitted the reservation command by managing the passage of time since the reception of.

1 is a diagram showing a system configuration of a wireless LAN system 10 according to an embodiment of the present invention. 2 is a diagram illustrating an example of a detailed functional configuration of a wireless LAN terminal 20. FIG. 2 is a diagram illustrating an example of an overview of a wireless LAN terminal 20. FIG. 2 is a diagram illustrating an example of a detailed functional configuration of an access point 30. FIG. It is a figure which shows an example of the data structure stored in the end time storage part. 4 is a flowchart showing an example of the operation of the wireless LAN terminal 20. 3 is a flowchart showing an example of the operation of an access point 30. It is a sequence diagram which shows an example of operation | movement of the wireless LAN system 10 in the case of transmitting a reservation command when performing a system suspension process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wireless LAN system, 11 ... Wired LAN, 12 ... SIP server, 13 ... Communication equipment, 14 ... Communication area, 20 ... Wireless LAN terminal, 200 ... Notification , 201 ... operation keys, 202 ... reservation period management section, 203 ... attribution processing section, 204 ... in-area determination section, 205 ... command transmission section, 206 ... key operation detection 207 ... Wireless communication unit, 30 ... Access point, 300 ... Wired communication unit, 301 ... Reservation permission terminal information storage unit, 302 ... Command reception unit, 303 ... End time Deletion unit, 304 ... wireless communication unit, 305 ... end time storage unit, 3050 ... terminal ID, 3051 ... end time, 306 ... belonging number storage unit, 307 ... attribution processing unit 40 ... Speaker, 1 ... display screen, 42 ... reservation button, 43 ... reservation release button, 44 ... numeric keys

Claims (3)

  1. An access point used in a wireless LAN system having a wireless LAN terminal,
    Reservation period storage means for storing a reservation period, which is a period during which wireless LAN terminal attribution is permitted, in association with identification information of the permitted wireless LAN terminal;
    Belonging number storage means for storing the number of wireless LAN terminals currently belonging;
    Reservation command reception for storing the reservation period in the reservation period storage unit in association with the identification information of the wireless LAN terminal when a reservation command including the identification information of the wireless LAN terminal is received from the belonging wireless LAN terminal Means,
    Referring to the reservation period storage means, after the reservation period stored in the reservation period storage means has elapsed , the number of wireless LAN terminals stored in the belonging number storage means is reduced by 1 and corresponding A reservation period deleting means for deleting the reservation period and the identification information associated with the reservation period;
    When an attribution request is received from a wireless LAN terminal, referring to the reservation period storage means,
    If the identification information of the wireless LAN terminal that transmitted the attribution request is stored in the reservation period storage means, the attribution number is increased without increasing the number of wireless LAN terminals stored in the attribution number storage means. Execute attribution processing with the wireless LAN terminal that sent the request,
    If the identification information of the wireless LAN terminal that transmitted the attribution request is not stored in the reservation period storage means, refer to the attribution number storage means,
    If the number of wireless LAN terminals currently belonging is less than the maximum number of wireless LAN terminals that can be simultaneously attributed, the number of wireless LAN terminals stored in the belonging number storage means is increased by one. Together with the wireless LAN terminal that transmitted the attribution request,
    If the number of wireless LAN terminals currently attributed is equal to or greater than the maximum attribute number, an attribution processing means for rejecting attribution of the wireless LAN terminal that transmitted the attribution request ,
    The attribution processing means is
    When receiving an attribution cancellation request from the currently belonging wireless LAN terminal, refer to the reservation period storage means,
    If the identification information of the wireless LAN terminal that transmitted the attribution cancellation request is stored in the reservation period storage means, the number of wireless LAN terminals stored in the attribution number storage means is not reduced by 1, Execute the attribution cancellation process with the wireless LAN terminal that sent the attribution cancellation request,
    If the identification information of the wireless LAN terminal that transmitted the attribution cancellation request is not stored in the reservation period storage means, the number of wireless LAN terminals stored in the attribution number storage means is reduced by 1, and the attribution information access point, wherein that you run attribution release processing with the wireless LAN terminal transmitting the release request.
  2. The access point according to claim 1,
    Reservation permission terminal information storage means for preliminarily storing wireless LAN terminal identification information for setting the reservation period according to the reservation command,
    The reservation command receiving means includes
    When the reservation command is received, if the identification information of the wireless LAN terminal included in the reservation command is stored in the reservation permitted terminal information storage unit, the reservation period is set as the identification information of the wireless LAN terminal. An access point that is stored in the reservation period storage means in association with each other.
  3. The access point according to claim 1 or 2,
    The reservation command includes the reservation period,
    The reservation command receiving means includes
    When the reservation command is received, the reservation period included in the reservation command is stored in the reservation period storage unit in association with the identification information of the wireless LAN terminal that has transmitted the reservation command. .
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