JP4268070B2 - Service quality assurance method, service quality assurance device, service quality assurance program, and recording medium recording the program - Google Patents

Description

  The present invention relates to a service quality assurance method, a service quality assurance device, a service quality assurance program, and a recording medium on which the program is recorded, which guarantees the quality of service using a wireless LAN (Local Area Network). More specifically, a wireless LAN is used by suppressing a queue set at a wireless LAN access point to a predetermined number or less and preventing a decrease in the occupied time of a wireless line per terminal during transmission. The present invention relates to a service quality assurance method, a service quality assurance device, a service quality assurance program, and a recording medium recording the program.

  The standardization of a wireless LAN is being standardized as IEEE 802.11 by IEEE (The Institute of Electrical and Electronics Engineers). One of them, IEEE 802.11e, has been studied for standardization, and a standardization plan has been announced as a draft (draft) (see Non-Patent Document 1).

  IEEE802.11e is a specification that has been studied for the purpose of transmitting music and moving images to a terminal in real time and with high quality using a wireless LAN. IEEE802.11a (54 Mbps in the 5.2 GHz band) And an additional function for complementing IEEE 802.11b (which specifies 11 Mbps transmission in the 2.4 GHz band). The additional function based on IEEE 802.11e is a function for guaranteeing QoS (Quality of Service) in the wireless LAN, and defines a transmission band control technique.

  Before describing IEEE 802.11e, the configuration of the wireless LAN will be briefly described first. As shown in FIG. 4, the wireless LAN is made up of an access point (hereinafter abbreviated as “AP”) 42 constituting a part of the network 41 and a terminal 43 that communicates with the AP 42 via a wireless line. Composed. The terminal 43 can change the AP 42 to be connected by moving. In FIG. 4, two APs and three terminals are shown, but the number is not limited to this.

  In IEEE 802.11e, as a transmission band control technique for guaranteeing QoS, a priority control type (Enhanced Distributed Channel Access, hereinafter abbreviated as “EDCA”) and a band guarantee type (HCF Controlled Channel Access), “ (Abbreviated as “HCCA”).

  The EDCA classifies packets transmitted between the terminal 43 and the AP 42 according to priority and stores them in a queue. The EDCA preferentially receives packets from a queue storing high priority packets (high priority queue). This is a method of sending out and transmitting to the terminal 43.

  Specifically, as shown in the EDCA configuration diagram of FIG. 5, the EDCA packet classification means 51 provided in the AP 42 is described in the QoS Control of the header part of the packet received via the network 41. The packets are classified into classes according to the priorities, and stored in a queue 52 set up for each class. In FIG. 5, four classes of queues 52 of “background, best effort, voice, moving image” are listed in order of priority. The stored packet is transmitted from each queue 52 by the transmission means 53, and transmitted to the terminal 43 by a CSMA / CA (Carrier Sense Multiple Access Collision Aidance) method. When the timings at which packets are transmitted from a plurality of transmission means 53 overlap, the schedule management means 54 gives priority to the packets sent from the queue 52 having a high priority.

  In this case, a queue storing high priority packets has a priority coefficient used in CSMA / CA and a random number width set to be small, and the transmission waiting time is shortened probabilistically. Can communicate.

  However, in EDCA, the time that one terminal can occupy and use a wireless line (wireless line occupied time) is calculated from the number of packets transmitted in a certain time and its data size. For this reason, if the number of terminals increases, the radio line occupation time that one terminal can use in one communication decreases. Therefore, even if a packet has a high priority, that is, a service with a high priority. However, since a certain radio channel occupation time cannot be ensured, transmission cannot be performed reliably, and as a result, it is difficult to guarantee the quality of service.

  HCCA is a system that guarantees the quality of service by classifying packets for each terminal to be transmitted, storing them in a queue, and managing the radio channel occupation time when packets are transmitted from the queue to the terminals.

  Specifically, as shown in the configuration diagram of the HCCA in FIG. 6, the packet classification means 61 provided in the AP 42 is configured such that the IP address of the destination terminal 43 described in the header portion of the packet received via the network 41. The packets are classified according to the above and stored in the queue 62 provided for each terminal 43. The stored packet is transmitted from each queue 62 by the transmission means 63 and transmitted to the terminal 43. The transmission to the terminal 43 is performed according to the schedule management of the wireless line in consideration of the packet transmission time by the schedule management means 64.

Comparing EDCA and HCCA, EDCA has the above-mentioned problems, so HCCA is effective from the viewpoint of guaranteeing service quality.
“Draft Supplement to STANDARD FOR Telecommunications and Information Exchange Between Systems-LAN / MAN Specific Requirements-Part11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) specifications: Medium Access Control (MAC) Enhancements for Quality of Service (QoS) ”, Draft 5.0, IEEE 802 Committee of the IEEE Computer Society, July 2003

  However, HCCA defines 8 as the maximum number of queues that can be installed in the AP. This is based on the assumption that HCCA uses a wireless LAN for a service that transmits a high definition television (HDTV) video within a limited range such as a home, where the number of terminals is one or two. It is because of doing. As described above, in HCCA, a queue is set for each terminal, so the maximum number of terminals is also eight. For this reason, when nine or more terminals request connection to the AP of the wireless LAN at the same time, HCCA cannot cope. In this case, at a hot point that is one of the important applications of a wireless LAN, when an unspecified number of terminals use various applications and request connection to the AP at the same time, HCCA is used. You can't do that. As described above, in a public-facing wireless LAN in which the number of terminals that request connection is large, it is difficult to guarantee the quality of service using HCCA.

  This problem is that, if the transmission speeds of the available wireless lines of a plurality of terminals that request connection to the same AP are all the same, packets transmitted from the plurality of terminals using the same application are stored in the same queue. However, the problem can be solved by sending out from the queue at regular intervals and sending it to the terminal.

  However, in a wireless LAN defined by IEEE802.11a and IEEE802.11b for which IEEE802.11e complements the function, the quality of the wireless channel deteriorates as the distance between the AP and the terminal increases. For this reason, in wireless LANs using these methods, the transmission speed of the wireless line is reduced as the distance between the AP and the terminal increases (hereinafter, this is referred to as “fallback”).

  Specifically, in the case of IEEE802.11b, the transmission speed of the wireless line changes in four stages according to the distance between the AP and the terminal due to fallback. In IEEE802.11a, there are 8 levels. As a result, the transmission rates that can be used by a plurality of terminals that request connection to the same AP are not all the same.

  The present invention has been made in view of such problems, and is a case where there are many terminals that request connection to an AP in a wireless LAN, and the transmission rates that can be used by each terminal are not all the same. Even so, a service quality assurance method, a service quality assurance device, a service quality assurance program, and a recording medium on which the program is recorded are provided to suppress the number of queues installed in the AP and guarantee the quality of service using a wireless LAN. The purpose is to do.

In order to solve the above-mentioned problems, the present invention uses the following method, apparatus, program, and recording medium on which the program is recorded.
According to the first aspect of the present invention, the packet classification means for classifying the packet of the service quality assurance method is a wireless channel determined in accordance with the type of application executed by the terminal described in the packet and the distance from the terminal. A packet storage means for classifying packets based on the transmission rate and storing the packets, the packet storage means storing the packets classified by the packet classification means in a queue corresponding to the classification, and managing a schedule for sending the packets The means determines a queue for sending packets and a timing for sending packets from the queue, and notifies the packet sending means for sending packets. The packet sending means is a queue determined by the schedule management means. Therefore, the packet is sent at the determined timing.

The quality of service guarantee method is executed in an AP or a dedicated device connected to the AP. Identification information to be referred to when the packet classification means of the service quality assurance method classifies the packet is described in the header of the packet. The queue is determined based on the type of application required by the service user and the service provider using the wireless LAN and the transmission speed of the required wireless line based on the type of application required for realizing the service. The number is determined and installed. Since packets classified in the installed queue are stored, the type and number of queues need to match the classification in the packet classification means. The packet storage means stores the classified packet in a queue of a type that matches the identification information referred to when the packet is classified. When the schedule management unit detects that the packet is stored in the queue, the schedule management unit sequentially registers the detected queue and calculates a transmission time required for transmitting the packet. Based on the registration information and the transmission time, the schedule management means determines the queue for sending packets and the timing for sending the packets, and notifies them to the packet sending means. According to the notification from the schedule management means, the packet sending means sends the packet from the designated queue at the designated timing, sends the packet to the transmission means conventionally provided in the AP, and the transmission means sends it to the terminal. .
The identification information described in the packet includes the type of application executed by the terminal and the transmission speed of the wireless line that can be used by the terminal. It is possible to know whether the identification information is the application type and the transmission speed of the wireless line depending on the type of application because it is a packet of a service to be preferentially executed. Priorities can be defined, and packets are classified based on this and the transmission speed of the wireless line required for transmission.
In addition, the type of queue is defined by the type of application executed by the terminal and the transmission speed of the wireless line that can be used by the terminal. Since the type of queue is the type of application and the transmission speed of the wireless line that can be used by the terminal, it can be seen from the type of application whether it is a service to be preferentially executed. The type of queue is determined and installed according to the transmission speed of the wireless line.

According to the second aspect of the present invention, as a queue, a queue for storing communication packets using an application in which a change in transmission speed of a wireless line usable by the terminal does not affect the quality of service; Is provided with a queue for storing, for each wireless line transmission rate, packets for communication using applications in which fluctuations in the transmission speed of the wireless line that can be used affect the quality of service.

  An application in which fluctuations in the transmission speed of the wireless line do not affect the quality of service is an application that does not require preferential transmission of packets, and packets with low priority are stored in this queue. An application in which fluctuations in the transmission speed of the wireless line affect the quality of service is an application that needs to preferentially transmit packets, and packets with high priority are stored in this queue.

In the invention according to claim 3, after the packet storage means selects a queue based on the type of application described in the packet, the packet storage means further waits based on the transmission speed of the wireless line usable by the terminal described in the packet. It was decided to select a matrix.

  Selection of a queue for storing packets is first performed based on the priority of the packet by referring to the type of application, and then, for packets with high priority, based on the transmission rate that the terminal can use. Is to be done.

According to the fourth aspect of the present invention, the management of the schedule for transmitting packets is performed by calculating the time for occupying the wireless line by the terminal communicating and the packet from the queue based on the calculated time for occupying the wireless line. Is generated by generating the timing for sending the packet and sending the packet from the queue at the timing of sending the packet.

  For high-priority packets, in order to guarantee the bandwidth at the time of transmission, the occupied time of the wireless line required for transmitting the packet is calculated, and the order of packets to be transmitted and the timing for transmission are generated. Based on this, the transmission schedule means sends the packet from the queue at the generated timing.

According to the fifth aspect of the present invention, the service quality assurance device is based on the type of application executed by the terminal described in the packet and the transmission speed of the wireless line determined in accordance with the distance from the terminal. Packet classification means for classifying the packets, packet storage means for storing the packets classified by the packet classification means in a queue corresponding to the classification, a queue for sending packets, and timing for sending packets from the queue And a schedule management means for notifying the packet sending means for sending the packet, and a packet sending means for sending the packet at a timing determined from the queue determined by the schedule management means. .

  The service quality assurance device is configured as a part of the AP or as a device connected to the AP. The content is the same as the service quality assurance method.

The invention according to claim 6 is a program for causing a computer to execute the service quality assurance method according to any one of claims 1 to 4 .

Is a program for executing the service quality assurance method according to claims 1 to claim 4 on a computer.

In the seventh aspect of the present invention, a program that causes a computer to execute the service quality assurance method according to any one of the first to fourth aspects is recorded on a computer-readable recording medium.

A program for causing a computer to execute the service quality assurance method according to any one of claims 1 to 4 is recorded on a recording medium. Examples of the recording medium include a hard disk, a CD-ROM, a DVD, a flexible disk, and a memory.

According to the first and fifth aspects of the present invention, the packets are classified according to the priority for transmitting the packets, and the packets are stored in the queue according to the priorities by arranging the queues according to the priorities. . Thereby, even if it is a case where a terminal increases, the increase in a queue can be suppressed. As a result, by managing the schedule for transmitting packets, it is possible to prevent a reduction in the line occupation time, and it is possible to use a quality-guaranteed service using a wireless LAN.
And the priority at the time of transmitting a packet can be prescribed | regulated based on the kind of application which a terminal performs, and the transmission speed of the radio | wireless line which a terminal can use. In addition, the queue can be set based on the type of application executed by the terminal and the transmission speed of the wireless line that can be used by the terminal.

According to the invention described in claim 2 , according to the priority of the packet, a queue for storing a packet for communication using an application in which a change in the transmission speed of the wireless line does not affect the quality of service; Packets of communication using an application in which fluctuations in the transmission speed of the wireless line affect the quality of service can be stored separately in queues that store for each transmission speed of the wireless line.

According to the third aspect of the present invention, it is possible to select a queue and store a packet in accordance with the priority defined by the type of application and the transmission speed of the wireless line.

According to the fourth aspect of the present invention, a packet is transmitted from the queue at a timing generated from the calculated occupied time of the wireless line and transmitted to the terminal by securing the wireless line. It is possible to guarantee the quality of service using a wireless LAN.

According to the invention described in claim 6 , it is possible to cause a computer to execute the service quality assurance method described in any one of claims 1 to 4 .

According to the seventh aspect of the present invention, the program for causing a computer to execute the service quality assurance method according to any one of the first to fourth aspects may be recorded on a computer-readable recording medium. it can. Moreover, a program can be run with a computer by making it read into a computer.

Next, embodiments of the present invention will be described in detail with reference to the drawings. Further, FIG. 4 will be referred to as necessary.
FIG. 1 is a block diagram of a service quality assurance device 1 that guarantees service quality using a wireless LAN according to the present invention. The service quality assurance device 1 is configured inside a wireless LAN AP 42 or connected to the AP 42 via a wireless line. FIG. 1 shows a case where the service quality assurance device 1 is configured inside the AP 42.

  The service quality assurance device 1 includes a packet classification unit 11 that classifies packets, a queue 12 that stores packets, a packet storage unit 13 that stores packets in the queue 12, and a schedule management that manages a schedule for sending packets. It comprises means 14 and packet sending means 15 for sending packets from the queue 12. Note that reception of packets via the network 41 and transmission of packets to the terminal 43 use reception means 421 and transmission means 422 that the AP 42 has conventionally provided.

  The packet classification unit 11 classifies the packet based on identification information described in the packet header, specifically, the type of application and the transmission speed of the wireless line that the terminal 43 can use. The type of the queue 12 is determined based on the type of application used in the service and the transmission speed of the wireless line that can be used by the terminal 43, which are determined by the contract between the service user and the service provider. . The determined type of queue 12 is installed in the service quality assurance device 1 in advance. The queue 12 temporarily stores the packets classified by the packet classification unit 11 before transmitting them to the terminal 43. The packet storage means 13 uses the same type (executed by the terminal 43) as the identification information (the type of application and the transmission speed of the wireless line that can be used by the terminal 43) referred to when classifying the packet. And the type of application to be used and the transmission speed of the wireless line that can be used by the terminal 43). The schedule management unit 14 selects the queue 12 to send the packet, determines the timing for sending the packet from the queue 12, and notifies the packet sending unit 15 of the timing. Based on the notification from the schedule management unit 14, the packet transmission unit 15 transmits the packet from the selected queue 12 at the determined timing.

<Packet classification means>
The packet classification by the packet classification unit 11 is performed according to the following criteria. First,
The packet classification means 11 changes the transmission speed of the wireless channel based on the type of application described in the packet header (the amount of data that can be transmitted or received per unit time changes). Is a packet of an application (hereinafter referred to as a “transmission speed-independent application”) that has little influence on the quality of service using a wireless LAN, or a fluctuation in the transmission speed of the wireless line is caused by using the wireless LAN. The packet is classified into an application having a large influence on the quality of service (hereinafter referred to as “transmission rate dependent application”).

  The transmission rate independent application includes, for example, an application used in VoIP (Voice over Internet Protocol) and best effort service. In addition, the transmission rate dependent application includes, for example, an application used in a guarantee type service such as streaming.

  Since the packet of the transmission rate-independent application does not depend on the transmission rate, the classification is determined by this. Since the packet of the transmission rate dependent application depends on the transmission rate, it is further classified based on the transmission rate.

  The packet classification unit 11 further classifies the transmission rate dependent application packet based on the transmission rate necessary for executing the application described in the header. However, in practice, since there are various transmission rates required for executing the application, there are cases where a standard in which a plurality of transmission rates are combined is set and the corresponding packet is classified there.

  For example, in the case of streaming, the standards of transmission speeds of 300 kbps and 600 kbps are set, the packets whose transmission speeds of 200 kbps, 300 kbps, and 400 kbps are described in the header are classified into the transmission speed of 300 kbps, and the transmission speed of 600 kbps is Packets whose transmission rates of 500 kbps, 600 kbps, and 700 kbps are described in the header are classified.

<Queue>
The queue 12 temporarily stores packets for the purpose of waiting for the transmission order to the terminal 43, and is set in advance based on a contract between a service user and a service provider. . The contract defines the service used by the service user.

  Specifically, a queue 12 is provided for each type of application required to execute a service determined by a contract in advance, and transmission determined by the type of AP 42 used in the wireless LAN depending on the type of application. A queue 12 is set up for each speed. The identification information used for classifying the packets described above needs to match one of the types of the queue 12.

  For example, in the case where there are two types of services determined in advance by contract, VoIP and streaming, a queue 12 for storing VoIP packets that is not significantly affected by fluctuations in transmission speed is installed, For streaming affected by fluctuation, a queue 12 for storing packets for each transmission rate (for 300 kbps and for 600 kbps) is installed.

<Packet storage means>
The packet storage means 13 uses the packet classification means 11 to transmit the packet of the transmission rate-independent application, or the packet of the transmission speed-dependent application, the packet classified based on the transmission speed, and the transmission of the application type and the wireless line. Store in queue 12 of the same speed.

<Schedule management means>
The schedule management means 14 selects a queue 12 for sending packets, and performs schedule management for determining the timing for sending packets from the selected queue 12.

  Specifically, the schedule management means 14 is information on the quality of service defined by a contract between the service user and the service provider (for example, guarantee type / best effort type, guaranteed line occupation time, guaranteed delay time). Is managed for each terminal 43 using the service. On that basis, the schedule management means 14 preferentially selects the queue 12 for storing the packets of the transmission rate dependent application, and determines the radio line occupation time required for transmitting the packets sent from the queue 12 to the terminal 43. Referring to information related to service quality, calculation is performed. The schedule management unit 14 manages the calculated wireless line occupation time in the order in which packets are transmitted to the terminal 43. When the schedule management means 14 receives a notification from the packet sending means 15 that the transmission of the packet to the terminal 43 has been completed, the schedule management means 14 determines the next packet sending timing using the radio line occupation time, and then sends it. The packet sending means 15 is notified together with the queue 12 to be sent.

  Further, the queue 12 for storing the packet of the transmission rate independent application is selected in the idle time during which the packet of the transmission rate dependent application is not transmitted, and the queue 12 and the timing of sending the packet from the queue 12 are selected. The packet sending means 15 is notified.

  Next, the operation of the service quality assurance device 1 will be described separately for a case where a transmission rate dependent application packet is transmitted and a case where a transmission rate independent application packet is transmitted.

<Transmission of packets for transmission rate dependent applications>
A case of transmitting a packet of a transmission rate dependent application will be described.

[Packet storage]
The operation of storing packets will be described with reference to the sequence chart shown in FIG. The packet classification unit 11 of the service quality assurance device 1 receives the packet from the packet reception unit 421 of the AP 42 (step S100), and based on the type of application described in the header and the transmission speed of the wireless line that can be used by the terminal 43. The packets are classified (step S101) and sent to the packet storage means 13 (step S102). The packet storage means 13 receives the packets received from the packet classification means 11 and queues 12 (queues B / C / D in FIG. 1) of the same type as the type of application used for packet classification and the transmission speed of the wireless line. (Step S103). The queue 12 storing the packet notifies the schedule management means 14 of this (step S104). Upon receiving the notification, the schedule management means 14 first has the notified queue 12 as a queue 12 for storing transmission rate independent application packets or as a queue for storing transmission rate dependent application packets. 12 is determined (step S105).

  As a result of the determination, if the queue 12 stores the packet of the transmission rate dependent application, the schedule management means 14 sends it from the notified queue 12 using information on the quality of service defined by the contract. The wireless line occupation time required for transmitting the packet is calculated (step S106). The schedule management unit 14 manages the calculated wireless line occupation time in the order of notification from the queue 12.

[Send packet]
The packet transmission operation will be described with reference to the sequence chart shown in FIG. When the schedule management means 14 receives a notification from the packet sending means 15 that the transmission of the packet to the terminal 43 is completed, the schedule management means 14 selects the queue 12 to send the packet next, and based on the managed radio line occupation time. The packet transmission timing is determined, and these are notified to the packet transmission means 15 (step S200).

  The packet sending means 15 requests the selected queue 12 to send packets at the determined timing (step S201), and the queue 12 sends the packets in the order in which the packets are stored, and sends the packets. The data is sent to the means 15 (step S202). The packet sending means 15 receives a packet from the queue 12 (queue B / C / D) and sends it to the sending means 422 provided in the AP 42 (step S203). Finally, the packet sending unit 15 notifies the schedule management unit 14 that the packet transmission has been completed (step S204).

<Transmission of packets for transmission rate independent applications>
A case of transmitting a packet of a transmission rate independent application will be described. As described above, the transmission of the transmission rate independent application packet is performed while the transmission of the transmission rate dependent application packet is not executed.

[Packet storage]
The operation for storing packets will be described with reference to the sequence chart shown in FIG. The packet classification unit 11 of the service quality assurance device 1 receives the packet from the packet reception unit 421 of the AP 42 (step S300), and based on the type of application described in the header and the transmission speed of the wireless line that can be used by the terminal 43. Are classified (step S301) and sent to the packet storage means 13 (step S302). The packet storage means 13 stores the packet received from the packet classification means 11 in the queue 12 (queue A in FIG. 1) of the same type as the application type used in packet classification and the transmission speed of the wireless line ( Step S303). The queue 12 storing the packet notifies the schedule management means 14 of this (step S304). Upon receiving the notification, the schedule management means 14 first has the notified queue 12 as a queue 12 for storing transmission rate independent application packets or as a queue for storing transmission rate dependent application packets. 12 is determined (step S305).

  As a result of the determination, if the queue 12 stores the packets of the transmission rate independent application, the schedule management unit 14 transmits the transmission rate independent type until there is a free time during which the transmission rate dependent application packet is not transmitted. Waiting for transmission of the application packet (step S306).

[Send packet]
The packet transmission operation will be described with reference to the sequence chart shown in FIG. When the idle time during which the packet of the transmission rate dependent application is not transmitted is generated, the schedule management unit 14 notifies the packet transmission unit 15 of the queue 12 for transmitting the packet and the transmission timing (step S400).

  The packet sending means 15 requests the notified queue 12 to send a packet at the notified timing (step S401), and the queue 12 (queue A) follows the order in which the packets are stored. To the packet sending means 15 (step S402). The packet sending means 15 receives the packet from the queue 12 and sends it to the sending means 422 provided in the AP 42 (step S403). Finally, the packet sending unit 15 notifies the schedule management unit 14 that the packet transmission has been completed (step S404).

The operation of the service quality assurance device has been described separately for the case of transmitting transmission rate dependent application packets and the case of transmission rate independent application packets.
As a result, the service quality assurance device stores a packet using a queue for storing transmission rate-independent application packets and a queue for storing transmission rate-dependent application packets. The number of queues installed in the apparatus can be reduced, and the quality of service using a wireless LAN can be guaranteed using HCCA.

It is a block diagram of the service quality assurance apparatus which guarantees the quality of service using the wireless LAN which concerns on embodiment of this invention. (A) is a sequence chart showing the storage of a packet when transmitting a packet of a transmission rate dependent application, and (b) is a sequence showing the sending of a packet when transmitting a packet of a transmission rate dependent application It is a chart. (A) is a sequence chart showing packet storage when transmitting a transmission rate-independent application packet, and (b) shows packet transmission when transmitting a transmission rate-independent application packet. It is a sequence chart. It is a figure which shows the structure of wireless LAN. It is a figure which shows the structure of a priority control type (EDCA) system. It is a figure which shows the structure of a band guarantee type | mold (HCCA) system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Service quality assurance apparatus 12 Packet classification means 12 Queue 13 Packet storage means 14 Schedule management means 15 Packet transmission means 42 Access point (AP)
421 receiving means 422 transmitting means

Claims (7)

A service quality guarantee method for guaranteeing the quality of service using a wireless LAN, which is connected to a terminal via a wireless line and includes a plurality of queues configured of one or different types,
Packet classification means for classifying the packet classifies the packet based on the type of application executed by the terminal described in the packet and the transmission speed of the wireless line determined according to the distance from the terminal. Procedure and
A packet storing means for storing the packet, storing the packet classified by the packet classifying means in a queue corresponding to the classification ;
A schedule management means for managing a schedule for sending the packet, determining a queue for sending the packet and a timing for sending the packet from the queue, and notifying the packet sending means for sending the packet;
The packet sending means for sending the packet at a determined timing from the queue determined by the schedule management means ;
A service quality assurance method characterized in that: As the queue,
A queue for storing packets of communication using an application in which fluctuations in the transmission speed of the wireless line usable by the terminal do not affect the quality of service;
A queue for storing, for each transmission speed of the wireless line, packets of communication using an application in which a change in the transmission speed of the wireless line that can be used by the terminal affects service quality ;
The service quality assurance method according to claim 1, further comprising : The packet storage means
After selecting the queue based on the type of application described in the packet, and further selecting the queue based on the transmission speed of the wireless line available to the terminal described in the packet ;
The service quality assurance method according to claim 1 or 2 , characterized in that: The management of the schedule for transmitting the packet is as follows:
Calculation of the time taken by the terminal to occupy the wireless line;
Based on the calculated time to occupy the wireless line, generation of timing to send the packet from the queue,
Being performed by sending the packet from the queue at a timing to send the packet ;
The service quality assurance method according to any one of claims 1 to 3 , wherein: A service quality assurance device for guaranteeing the quality of service using a wireless LAN, which is connected to a terminal via a wireless line and includes a plurality of queues configured of one or different types,
A packet classification unit for classifying the packet based on the transmission rate of the radio channel that is determined to correspond to the distance between the type and the terminals of the application to be executed is the terminal described in the packet,
Packet storage means for storing the packets classified by the packet classification means in a queue corresponding to the classification ;
A schedule management means for determining a queue for sending the packet and a timing for sending the packet from the queue, and notifying the packet sending means for sending the packet;
A packet sending means for sending the packet at a determined timing from the queue determined by the schedule management means ;
A service quality assurance device comprising: A service quality assurance program for causing a computer to execute the service quality assurance method according to any one of claims 1 to 4 . A computer-readable recording medium storing a program for causing a computer to execute the service quality assurance method according to any one of claims 1 to 4 .

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