JPH10271165A - Communication quality setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently set communication quality from a data packet transmission terminal to data packet reception terminals by generating a table for associating communication quality which is set on a communication line with a traffic characteristic to be transmitted for a data packet transmission terminal and deciding communication quality by referring to the table prior to the transmission of data. SOLUTION: When the data transmission terminal 201 knows communication quality corresponding to the traffic characteristic of the data packet to be transmitted, it transmits a quality setting packet to data reception terminals 202 and 203 prior to the transmission of the data packet. Routers 208-213 through which the quality setting packets pass set communication quality for a line interface and the data reception terminals 202 and 203 receiving the quality setting packet set communication quality for the received interface. Thus, the transfer of the data transmission terminal 201 and the data reception terminals 202 and 203 can be reduced prior to the transmission of the data packet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a communication quality setting method.

[0002]

2. Description of the Related Art Communication quality control performed by a router includes control for processing a specific packet preferentially and control for guaranteeing a band for a specific packet. In these control methods, an administrator of each router performs setting for the router device to preferentially process a packet of an application that requires real-time processing, and communication quality assurance control is performed based on the setting. In these schemes,
In order to perform quality assurance control on traffic of a specific application between certain terminals, an administrator must perform the same setting for all routers existing between the terminals.

In order to perform communication quality control on traffic between terminals, standardization work of a protocol for transmitting communication quality information required by traffic from a terminal side to all routers on a communication path has been advanced. I have. This protocol achieves the required communication quality by the router device and the terminal by requesting the router device and the communication partner terminal of communication quality information necessary for performing communication. It is called a resource reservation protocol because it secures network resources. Regarding the resource reservation protocol, see Nikkei Communication No. 209, p71-P76 (19
95.11.6). The resource reservation protocol is operated on the terminal and the router, and the communication quality information requested from the terminal to the router is transmitted to all routers on the communication path to the partner communication terminal. In each router device, by performing communication quality control so as to satisfy the communication quality of each traffic transmitted by the resource reservation protocol, the administrator can set the communication quality between the terminals without setting the communication quality information in the router device. The communication quality of traffic can be guaranteed.

[0004]

In the prior art, a data packet transmitting terminal periodically transmits traffic information of transmission data to a receiving terminal. On the other hand, the terminal desiring to receive data transmits the requested communication quality to the data packet transmitting terminal. Since traffic information and communication quality information are regularly exchanged between transmitting and receiving terminals, the traffic on the line is increased. Furthermore, when the data transmitting terminal transmits data to a plurality of receiving terminals, the communication quality reservation packet further increases the traffic on the line as the number of receiving terminals increases.

[0005] The prior art is a WAN (wide area network).
But for LAN (local area network)
It is also necessary to ensure communication quality when broadcasting data that requires real-time properties in a closed area by using. In such a case, particularly, the configuration of the receiving station does not frequently change, and if the application is determined, the required communication quality is also determined, and it is not necessary to change the communication quality to be set every time data is transmitted.

An object of the present invention is to provide a data transmission terminal having a correspondence table of traffic characteristics of transmission data and a communication quality comprising a plurality of parameters, referencing the table before transmitting data, determining communication quality and determining data quality. An object is to efficiently set communication quality from a transmission terminal to a data reception terminal.

[0007]

In order to achieve the above object, a data packet transmitting terminal prepares a table associating communication quality set on a communication path with traffic characteristics to be transmitted, and the table is transmitted prior to data transmission. And, when the communication quality corresponding to the traffic characteristic to be transmitted is not set, a packet requesting transmission of the communication quality to the data packet receiving terminal is transmitted, and the packet indicating the communication quality from the data packet receiving terminal is transmitted. When the communication quality is set in the above table when the communication quality is received, and the communication quality corresponding to the traffic characteristic to be transmitted is set, a packet for setting the communication quality is transmitted on the communication path and the communication quality is set. After a certain packet transmission, a data packet is transmitted after a predetermined time. In addition, when the data packet receiving terminal receives a packet requesting transmission of communication quality, the data packet receiving terminal transmits a packet in which the requested communication quality is set. Further, in a router device for relaying a packet between a data packet transmitting terminal and a data packet receiving terminal, when a packet for setting a communication quality is received, the communication quality is set for an interface corresponding thereto, and then the received packet is forwarded. An interface that forwards a received packet when a packet requesting quality transmission or a data packet is received, merges the communication quality of the packet when receiving a packet that reserves the communication quality from a data packet receiving terminal, and corresponding interface After setting the communication quality, the packet in which the result of the merge of the communication quality is set is forwarded.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a processing flowchart in a data packet transmitting terminal for setting communication quality, which is one embodiment showing the features of the present invention.

First, an outline of a network configuration example to which this processing flowchart is applied will be described with reference to FIG. 2, and then a communication quality setting method in a data packet transmitting terminal will be described in detail with reference to FIG.

FIG. 2 shows an example of the network configuration. The network configuration includes terminals 201, 202, and 203 that perform packet transmission and reception and communication quality setting, and sub-networks 204, 205, and 20 that relay packet transmission and reception between terminals.
6, 207, router 20 connecting between sub-networks
8, 209, 210, 211, 212, and 213.

In the present invention, a data packet and a control packet are used. The control packet consists of the following three types. A packet for setting communication quality is called a quality setting packet, a packet for notifying communication quality from a receiving terminal to a transmitting terminal is called a quality reservation packet, and a packet for requesting transmission of a quality reservation packet is called a quality request packet. A terminal that transmits a data packet is simply called a transmitting terminal 201, and terminals that receive a data packet are called receiving terminals 202 and 203. It is also possible for the transmitting terminal to double as the receiving terminal.

Before transmitting a data packet, the transmitting terminal 2
01, when the communication quality corresponding to the traffic characteristic of the data to be transmitted is known, the quality setting packet for setting the communication quality to the communication path is received by the receiving terminals 202 and 203.
Send to Router 2 located on the path through which packets pass
When receiving the quality setting packet, 08, 209, 210, 211, 212, and 213 set the quality for the line interface, and transmit this packet to the interface other than the one that received it. Router 208, 20
Receiving terminals 202 and 203 which have received the quality setting packets via 9, 210, 211, 212 and 213 set the communication quality on the received interface and wait for data reception.

If the packet transmitted by the transmitting terminal 201 is a quality request packet, the routers 208, 209, 210, 211, and 21 located on the path through which the packet passes
2, 213 transmits this packet to an interface other than the one received by itself. Routers 208, 209,
Receiving terminals 202 and 203 that have received the quality request packet via 210, 211, 212 and 213 are routers 208, 209, 210, 211, 212 and 213 on the route.
Transmits a packet for making a communication quality reservation to the. Each router 208, 209, 210, 211, 21
2, 213 sets the communication quality to the interface by receiving the packet. Router 211 and Router 212
Router 20 that has received the quality reservation packet from two locations
Reference numeral 9 merges the contents of the two quality reservation packets, and sets the communication quality of the merged result in the interface on the transmitting terminal 201 side. The quality reservation packets transmitted by the receiving terminals 202 and 203 are passed to the transmitting terminal 201 via the router 208. The transmitting terminal 201 that has received the quality reservation packet updates the correspondence table between the traffic characteristics of the transmitted packet and the communication quality.

With the above operation, the quality from the transmitting terminal 201 to the receiving terminals 202 and 203 is set.

A method of setting communication quality in transmitting terminal 201 will be specifically described with reference to FIG.

First, in step 101, referring to the table 301 shown in FIG. 3, the traffic characteristics of the packet to be transmitted are searched, and it is searched whether the quality corresponding to the traffic characteristics is set.

Table 3 in which communication qualities corresponding to the traffic characteristics of the transmission data referred to in step 101 are set.
01 is shown in FIG.

The table 301 includes an area 302 indicating traffic characteristics for each data to be transmitted, P1, P2, and P3 indicating detailed contents of the traffic characteristics, and an area 306 indicating communication quality set on a communication path. The traffic characteristic 302 indicates a value determined by a combination of the parameters P1, P2, and P3. The parameters P1, P2, and P3 indicating the contents of the traffic characteristics include, for example, a transfer rate (bits / sec) in which P1 is a type of transfer data packet, a text packet, a voice packet, a moving image packet, and P2 are secured on a line. Let P3 be the transfer delay (sec).

The receiving terminals 202 and 203 determine the communication quality to be set from the traffic characteristics set in the received packet.

If the quality for the traffic characteristics of the packet to be transmitted is set in step 102, step 1
At step 03, a packet 401 shown in FIG. 4 is created. When the traffic characteristic is T-1, P1 is set to a, P2 to c, and P3 to e.
Referring to the quality 306 corresponding to this area, 1 is set. Therefore, in this case, a packet 401 for setting the communication quality is created. FIG. 4 shows a packet format. A packet 401 is S402 indicating the address of a terminal that transmits the packet, and D403 is an address of a terminal that receives the packet. Here, D403 sets a multicast address when transmitting a packet to a plurality of receiving terminals. K40 indicating the packet type
4, TF 405 indicating traffic characteristics of transmission data, and CQ 406 for setting communication quality. When the packet type k404 is data: 0, quality setting packet:
1, quality request packet: 2, quality reservation packet: 3. In this example, the packet type k404 is 1, and the communication quality 1 corresponding to T-1 of the traffic characteristic 302 is CQ40.
Set to 6. The communication quality setting packet does not require the setting of the traffic characteristics TF405. At this time, communication quality is set for network controllers 504, 505, and 506 described later. The quality setting packet created in step 104 is transmitted. Next, at step 105, the timer is started. This timer is set in consideration of the time from when the transmitted communication quality setting packet reaches the receiving terminals 202 and 203 to when the communication quality is set in the communication path. In step 106, the timeout of the packet is monitored, and the monitoring is continued until the timeout occurs. When a timeout occurs, data transmission is started in step 107.

In step 102, referring to the table 301, if the quality 306 is not set, step 1
08 is performed. For example, when the traffic characteristic 302 is T-3 in the table 301, the quality 306 is not set. In step 108, a packet 401 is created.
In S402, the address of the transmitting terminal 201 is set.
Are set to the addresses of the receiving terminals 202 and 203, and k404
, And the traffic characteristics of transmission data are set in TF405. In this example, T-3 is set, the packet type k404 is set to 2, and the packet is a quality request packet. CQ 406 for setting the communication quality does not need to be set. Step 1
The quality request packet created in step 09 is transmitted. Next, in step 110, the reception of the quality reservation packet from the receiving terminals 202 and 203 for the packet transmitted in step 109 is awaited. Upon receiving the packet, the table 301 is updated in step 111. Here, the quality set in the received packet in the portion corresponding to the quality 306 for the traffic characteristic T-3 is set. The communication quality is
2, 203 to routers 208, 209, 210, 21
It is set on a communication path that reaches the transmitting terminal 201 via 1, 212, and 213. When the quality reservation packet is received and the table 301 is updated, the data transmission is started in step 107.

FIG. 5 shows a configuration diagram of the packet transmission terminal 201 which executes the processing flow shown in FIG. Packet receiving terminals 202, 203 and routers 208, 209, 21
Process follow-up described later in 0, 211, 212, and 213 is also executed with the same configuration.

The transmitting terminal 201 includes a CPU 501 for executing a processing flow, a memory 502 for storing transmission / reception packets and programs, and data, communication lines 507 and 508,
A network controller 504 for controlling the 509;
It comprises a bus 503 for controlling and exchanging data between the elements 505 and 506 and the elements described above. Memory 50
2 are transmitted to communication lines 507, 508, 509 via a bus 503 and network controllers 504, 505, 506. Packets received from the communication lines 507, 508, 509 are stored in the memory 502 via the network controllers 504, 505, 506 and the bus 503. Further, the network controllers 504, 505, and 506 set communication quality such as the speed and delay of a communication path in accordance with an instruction from the CPU 501.

Next, the routers 208, 209, 210, 21
The operations at 1, 212, and 213 will be described with reference to FIGS.

In step 601, the process waits for the reception of a packet.
If a packet has been received via the communication lines 507, 508, 509 and the network controllers 504, 505, 506, the process proceeds to step 602. Step 602
The packet type k404 of the packet 401 received by
If it is set to packet 4 in step 603
01 is set in the network controller 50i that has received the communication quality. The communication quality set in the network controller 50i includes a plurality of parameters such as a communication speed and a delay. Routers 208, 209, 210, 211, 2
FIG. 8 shows a table of parameters referred to in steps 12 and 213. The elements for setting the communication quality are usually not so many. For this reason, one value is assigned to a combination of a plurality of parameters, and this is assigned to the receiving terminals 202 and 203 and the routers 208, 209, 210,
211, 212, and 213, and this value is set in the control packet. As a result, the amount of information transferred by the packet 401 can be reduced. Table 7 shown in FIG.
01 includes communication quality (quality to be set) 702 indicating a value set in the packet 401, and parameters P1 and P2 for setting communication quality. For example, when the field CQ 406 indicating the communication quality of the received packet 401 is set to 2, P1 is set to a, parameter 2 is set to d, and the values are set to the network controller 50i. In the example of the table 701 shown here, the parameter 1 has two values a and b, and the parameter 2 has two values c and d. Therefore, there are four types of communication quality based on this combination.

After setting the communication quality in step 603,
Other routers 208, 209, 210, 211, 212,
The packet 401 received to perform the same setting in 213
From the memory 502 via the network controller 50i.

The packet 402 received in step 602
If is not a quality setting packet, it is determined in step 605 whether the packet is a quality request packet or normal data. If the packet is a quality request packet or normal data, the packet 402 received in step 604 is forwarded. With reference to the packet type k404, if there is no quality request packet or normal data in step 605, it is determined in step 606 whether the packet is a quality reservation packet. Packet type k404
If is not 3, the process returns to step 601. In the case of a quality reservation packet, it is determined in step 607 whether the first quality reservation packet has been received. Step 60 for the first case
At 8, the timer is started. After the timer starts, the process returns to step 601. If the packet is not the first packet, the packet is compared with the packet received immediately before in step 609, and is merged with the previously received communication quality in step 610 according to the comparison result, and the value is retained. Next, in step 611, it is determined whether a timeout has occurred. If no timeout has occurred, the process returns to step 601. If a time-out has occurred, the merge result is sent to packet 4 in step 612.
01 is set to the communication quality CQ 406 and transmitted to the transmitting terminal 201. After transmitting the packet 401, the process returns to step 601.

Next, the processing flow in the receiving terminals 202 and 203 will be described with reference to FIG. The packet received via the network controller 50i is stored in the memory 502
And is processed by the CPU 501. Step 80
In step 802, the packet type k404 of the packet 401 is referred to when the reception of the packet is recognized. If the packet is a quality request packet, the table 901 shown in FIG. The value is compared with the value of the characteristic TF405. FIG.
A table 901 shown in FIG. 9 has a value 90 corresponding to the traffic characteristic TF 405 set in the received packet 401.
2, a communication quality 903 corresponding to the communication quality CQ 406, and P1 and P2 indicating parameters of the communication quality. A table 906 shown in FIG.
Is composed of P1, P2, and P3 indicating parameters corresponding to the value of. After the communication quality is determined in step 803, the packet 401 is created and the communication quality is set in the network controller 50i in step 804.

For example, if the traffic characteristic is T-2, the required quality is 2, and a quality reservation packet is created in step 804. The address of its own station is set as the source address S402, and the address of the transmitting terminal 201 is set as the destination address D403. Packet type k40
In 4, 3 indicating a quality reservation packet is set. The traffic characteristic TF405 remains at T-2, and the quality CQ406
Sets 2 as described above. After the creation of the packet 401 is completed, the packet 401 is transmitted in step 805, and the process returns to step 801. The quality CQ 406 to be set is the traffic characteristic TF40 received to reflect the user's request.
5 can be displayed to the user and determined. At this time, referring to the table 906 shown in FIG. 11, if the traffic characteristic is T-2, the user displays P1 as a, P2 as c, and P3 as d, and decides the communication quality for this. At step 805, a quality reservation packet is transmitted.

If the packet received in step 802 is not a quality request packet, it is determined in step 806 whether the packet is a quality setting packet by referring to the packet type k404. If the packet is a quality setting packet, reference is made to the table 901 in step 807 to determine the quality CQ 406 of the packet 401.
Is 2, the communication quality 903 is searched for 2 and the corresponding P
1, a and d are set in the network controller 50i by P2.

If the packet is not a quality setting packet in step 806, the packet type k404 of the packet 401 is referred to in step 808 to determine whether the packet is a data packet. If the value is 0, data reception processing is performed in step 809. Step 801 when the data processing is completed
Return to If it is not data in step 808, step 8
Return to 01.

According to the first embodiment, a data transmitting terminal has a correspondence table of traffic characteristics of transmission data and communication quality including a plurality of parameters, and determines the communication quality by referring to the table prior to data transmission. Set the communication quality from the sending terminal to the receiving terminal. Generally, traffic characteristics of transmission data are finite and depend on applications. For example, data types include text data, audio data, moving image data, interactive data, data that requires real-time properties, and the like. Once the application is determined, the communication quality (transfer speed, etc.) to be set is rarely changed, and the communication quality is also determined. Therefore, it is useless to transmit the traffic characteristics of the transmission data to all the receiving terminals every time the data is transferred, and to transmit the communication quality set for the transmission characteristics. If the type of data to be transmitted and the application are determined, the communication quality is determined. Therefore, there is a correspondence between the traffic characteristics and the communication quality, and the communication quality is determined and set based on the correspondence. In particular, considering that a video conference or the like is performed via a closed LAN in a company, the required communication quality is rarely changed every time the video conference starts, and in such a situation, the configuration of the data receiving station is frequently changed. It does not change much. For this reason, the communication quality corresponds to the traffic characteristics.
Therefore, by having the correspondence table between the traffic characteristics of transmission data and the communication quality in the data transmission terminal as in the present invention, it is possible to reduce unnecessary exchanges between the data transmission terminal and the data reception terminal prior to data transmission. .

Next, as a second embodiment, a method of updating the table held by the transmitting terminal shown in the first embodiment independently of data transmission / reception will be described with reference to FIG.

The transmitting terminal 201 first starts a timer in step 1001. The update cycle of the correspondence table between the traffic characteristics and the communication quality is determined by the timer interval set here. In step 1002, occurrence of a timeout is monitored. Step 1 if a timeout occurs
At 003, a quality request packet is created. This procedure is the first
This is the same as the method shown in the embodiment. Then step 10
At step 04, a quality request packet is transmitted, and at step 1008, reception of a reservation packet as a response to the quality request packet is monitored. Step 1 is performed by receiving the quality reservation packet transmitted by the receiving terminal in response to the quality request packet.
At 006, a correspondence table 30 of traffic characteristics and communication quality
1 is updated. The processing of the quality request packet and the quality reservation packet shown here at the router and the receiving terminal is the same as in the first embodiment.

According to the above procedure, the correspondence table between the effective traffic characteristics and the communication quality can be updated.

In the first embodiment, only one quality is set in the quality setting packet transmitted from the transmitting terminal 201.
And 203 have the same communication quality. Next, as a third embodiment, when the receiving terminals 202 and 203 request different communication quality,
And a method for setting different communication qualities between the router 209 and the receiving terminal 203.

Transmission terminal 201, reception terminals 202 and 203
And routers 208, 209, 210, 211, 21
The processing flow in 2, 213 is basically the same.
Packet format 401 for implementing this embodiment
Then, the table 301 held by the transmitting terminal 201 is changed. FIG. 13 shows a new packet format 1107.
FIG. 14 shows a table 1207 used in this embodiment.

The quality reservation packet created by the receiving terminals 202 and 203 is converted into a packet 1107 by the router 209. In FIG. 13, the source address S402 is the router 20
9 and the destination address D4
03 sets the address of the transmitting terminal 201.

The packet type k404 is kept at 3, and the traffic characteristics TF405 do not need to be changed.

The communication quality CQ1 is set to the communication quality 406 of the packet 401 transmitted by the receiving terminal 202, and the address A1 is set to the address of the receiving terminal 202. The communication quality 406 of the packet 401 transmitted by the receiving terminal 203 is set as the communication quality CQ2, and the address of the receiving terminal 203 is set as the address A2.

The merging result set in the packet transmitted in step 612 of FIG. 7 described in the first embodiment is set in the communication quality CQ3, and the router A 20 is set in the address A3.
9 address is set. The transmitting terminal 201 that has received the packet 1107 performs the process shown in FIG.
The table 1207 shown in FIG. Packet 1107
With reference to the traffic characteristic TF405 set in the table 1207, the same thing is searched from the table 1207. If the traffic characteristic 302 is T-1, CQ1 is at the top of quality 1, address A1 is at the top of A1, and CQ2 is quality 2
, The address A2 is set at the top of A2, the CQ3 is set at the top of quality 3, and the address A3 is set at the top of A3. This table is referred to when a quality setting packet is created in step 103 of FIG. The procedure for creating the packet 1107 is completely opposite to the procedure for creating the table 1207 described above, and a description thereof will be omitted. The settings of the source S402 and the destination D403 are the same as in the first embodiment. When this packet 1107 is received by the router 209 after transmitting the quality setting packet in step 104 of FIG. 1, the quality setting is performed by CQ3 corresponding to A3 in which the router address of the packet 1107 is set in step 603 of FIG. After that, the packet 1107 is divided into the packets 401 shown in the first embodiment. Address part A1
And A2 are set as destination addresses D403 of different packets. The communication quality CQi corresponding to the address is set. Source address S
402, packet type k404, traffic characteristics TF4
05 is the same as the packet 1107 before division. According to the present embodiment, it is possible to set different communication qualities for each interface for the same traffic characteristics.

[0043]

According to the present invention, a transmitting terminal of a data packet holds a correspondence table between traffic characteristics of transmission data and communication quality, and determines communication quality prior to data transmission, thereby providing a communication path on a communication path. Optimal and efficient communication quality settings can be made for various transmission data or applications.

[Brief description of the drawings]

FIG. 1 is a flowchart of a communication quality setting process in a data transmission terminal.

FIG. 2 is a block diagram showing a network configuration example.

FIG. 3 is an explanatory diagram of a management table of traffic characteristics and communication quality used in a data transmission terminal.

FIG. 4 is a format diagram of a control packet.

FIG. 5 is a basic block diagram of hardware of a data transmission terminal, a data reception terminal, and a router.

FIG. 6 is a processing flowchart in a router.

FIG. 7 is a processing flowchart in a router.

FIG. 8 is an explanatory diagram of a management table of traffic characteristics and communication quality used in the router.

FIG. 9 is a processing flowchart in a data receiving terminal.

FIG. 10 is an explanatory diagram of a management table of traffic characteristics and communication quality used in the data receiving terminal.

FIG. 11 is an explanatory diagram of a management table of traffic characteristics and communication quality used in the data receiving terminal.

FIG. 12 is a processing flowchart for requesting communication quality in the data transmission terminal.

FIG. 13 is an explanatory diagram of a packet format for setting a plurality of communication qualities.

FIG. 14 is an explanatory diagram of a traffic characteristic and communication quality management table for setting a plurality of communication qualities;

[Explanation of symbols]

201: data transmission terminal, 202, 203: data reception terminal, 204, 205, 206, 207: subnetwork, 208, 209, 210, 211, 212, 213: router, 301: management table of traffic characteristics and communication quality, 401: packet format, 501: CPU, 502: memory, 503: bus, 504, 505, 506: network controller.

Claims (5)

[Claims] In a communication system in which terminal devices are interconnected via a network, a data packet transmitting terminal creates a table for associating a communication quality set on a communication path with a traffic characteristic to be transmitted. Refer to the above table prior to the transmission, if the communication quality corresponding to the traffic characteristics to be transmitted is not set, transmits a packet requesting transmission of the communication quality to the data packet receiving terminal, from the data packet receiving terminal The communication quality is set in the table and the received interface described when receiving the packet indicating the communication quality of the above, and when the communication quality corresponding to the traffic characteristic to be transmitted is set by referring to the table, A packet that sets communication quality on the transmission interface and sets communication quality on the line And transmitting a data packet after a lapse of a predetermined time. 2. A router device according to claim 1, wherein said router device relays a packet between said data packet transmitting terminal and said data packet receiving terminal. After setting, forward the received packet, forward the packet requesting transmission of communication quality, or forward the received packet when receiving a data packet, and merge the communication quality of the above packet when receiving a packet that reserves communication quality. A communication quality setting method for setting a communication quality for a corresponding interface and then forwarding a packet in which a result of merging the communication qualities is set. 3. The data packet transmitting terminal according to claim 1, wherein the data packet transmitting terminal transmits a packet requesting transmission of communication quality to the data packet receiving terminal irrespective of data packet transmission, and receives the communication quality information. A communication quality setting method in which the data packet transmitting terminal updates the table. 4. The communication quality setting method according to claim 1, wherein one value is assigned to a combination of a plurality of parameters. 5. The router according to claim 1, wherein packets for reserving communication quality transmitted by different data packet receiving terminals are combined into one packet in the router, and packets for setting communication quality are transmitted to a plurality of packets having different destination addresses. A communication quality setting method that divides packets into packets.