JP2018037973A - Gateway router and QoS control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide gateway router capable of fair QoS (Quality of Service) considering transfer delay in a transfer unit at a key point at which user traffics geographically dispersed in wide area are converged.SOLUTION: A gateway router GWR which transfers packets from edge routers ER1 and ER2 to a destination, includes: a required arrival time acquisition section 101 acquires a packet required arrival time from an edge router of a transmission source of a packet; and a QoS control unit 103 that executes a QoS (Quality of Service) control depending on the packet required arrival time. The QoS control unit may reduce the packet abandonment rate for the larger the packet required arrival time.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gateway router and a QoS (Quality of Service) control method, and more particularly, to a gateway router and a QoS control method for performing fair QoS control at an aggregation base.

  In order to provide a more efficient service, a method is considered in which service functions that have been conventionally deployed at the edge portion are separated and deployed centrally in a remote DC (data center) or the like.

  FIG. 1 is a schematic diagram showing a method of deploying service functions at an aggregation base. A group of servers for realizing the service function is centrally deployed in the DC, which is the service function aggregation base. The traffic from each user terminal is distributed by ER (edge router), and the traffic that needs to be processed by the service function is transferred to the aggregation base.

  Since traffic is transferred from a wide range to the aggregation base, there is a concern that the traffic processed by the service function of the aggregation base may increase in a burst manner. Furthermore, even a slight increase at each edge router can cause a significant increase in traffic at the aggregation location, so it is difficult to suppress bursts at the edge router, and it is necessary to suppress bursts at the GWR (gateway router) at the aggregation base. is there.

  As a solution to the above problem, there is 2r3c (2 rate 3 color) / WRED (Weighted Random Early Detection) (see Non-Patent Documents 1 and 2).

  2r3c provides two-level thresholds (CIR (Committed Information Rate) and PIR (Peak Information Rate)) in the token bucket. If the token flow rate is less than CIR, the packet is Green. If the token flow rate is more than CIR and less than PIR, the packet is Yellow. Then, it is a technology to color the packet to Red.

  WRED is a technology that suppresses bursty congestion by dropping packets that accumulate in a queue in advance. The packet discard probability is not completely random, but is weighted according to coloring by 2r3c, and the discard probability increases in the order of Green ≦ Yellow ≦ Red.

  FIG. 2 shows an outline of the queue in WRED. In FIG. 2, two colors, Green and Yellow, are shown for simplicity. In WRED, the queue is a Green dedicated area (Green dedicated section), an area where Yellow packets are discarded with a certain probability (Yellow packet random discard section), an area where Red packets are discarded with a certain probability (not shown), All packets are divided into areas (non-discarded sections) where they can be stored. When a packet is stored in the queue, the packet is discarded according to the remaining amount of the queue after storage.

  In WRED, the throughput of TCP (Transmission Control Protocol) communication can be suppressed and the occurrence of burst loss can be reduced by randomly discarding Yellow and Red packets in order to reduce the occurrence of burst loss.

RFC2698, "A Two Rate Three Color Marker", September 1999, Internet (URL: https://www.ietf.org/rfc/rfc2698.txt), search on August 4, 2016 Sally Floyd and Van Jacobson, "Random Early Detection (RED) gateways for Congestion Avoidance", August 1993, Internet (URL: http://www.icir.org/floyd/papers/red/red.html), 2016 8 Month 4 search

  When 2r3c / WRED is applied to the GWR at the central location, the throughput of TCP communication can be suppressed and the occurrence of burst loss can be reduced.

  On the other hand, in TCP communication, a window size is used to determine an appropriate transmission rate. The TCP window size can be calculated by the following formula.

TCP window size = transmission rate * RTT
That is, since the transmission rate is inversely proportional to RTT (Round Trip Time), the RTT causes a difference in throughput for each user.

  Although it is conceivable to increase the queuing buffer area as a method of reducing the throughput difference due to RTT, it is difficult to prepare a sufficient buffer capacity for the traffic that increases year by year.

  In order to solve such a solution, an object of the present invention is to provide a fair QoS in consideration of a transfer delay in a transfer apparatus at a base where user traffic distributed over a wide geographical area is aggregated.

A gateway router according to an aspect of the present invention is:
A gateway router that forwards packets from an edge router to a destination,
An arrival time acquisition unit for acquiring the packet arrival time from the edge router of the packet source;
A QoS control unit that performs QoS (Quality of Service) control according to the packet arrival time;
It is characterized by having.

In addition, the QoS control method according to an aspect of the present invention includes:
A QoS (Quality of Service) control method in a gateway router that forwards a packet from an edge router to a destination,
Obtaining a packet arrival time from the edge router of the packet source;
Implementing QoS control according to the packet arrival time;
It is characterized by having.

  According to the present invention, it is possible to provide fair QoS considering transfer delay in a transfer apparatus at a base where user traffic distributed over a wide geographical area is aggregated.

Schematic diagram showing the method of deploying service functions at a central location Figure showing an overview of queues in WRED Schematic diagram of QoS control according to an embodiment of the present invention Schematic diagram of QoS control according to Embodiment 1 of the present invention The flowchart which shows QoS control which concerns on Example 1 of this invention Schematic diagram of QoS control according to the second embodiment of the present invention Schematic diagram of QoS control according to the third embodiment of the present invention Schematic diagram of QoS control according to Embodiment 4 of the present invention Schematic diagram of QoS control according to the fifth embodiment of the present invention Schematic diagram of QoS control according to Embodiment 6 of the present invention

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

  In the embodiment of the present invention, a communication system having an ER (edge router) and a GWR (gateway router) will be described. The ER is a device that accommodates a user, and is a router device that forwards a packet from the user to an appropriate destination. The GWR is a router device that is arranged at a service function aggregation base or the like and forwards packets transferred from the ER to a destination service function providing server or the like. In order to provide fair QoS in such a communication system, a packet arrival time required for transfer from the packet source ER to the GWR is acquired, and QoS control is performed according to the result. Specifically, the packet discard rate is controlled for each ER of the transmission source by adjusting the ratio of the color marked by the policer of the GWR according to the time required for arrival of the packet. The GWR temporarily stores the received packet in the buffer, but because the buffer capacity is limited, the policer discards the packet that cannot be stored in the buffer. The policer performs marking (Green, Yellow, Red) used when discarding the packet.

  FIG. 3 is a schematic diagram of QoS control according to an embodiment of the present invention. The GWR according to the embodiment of the present invention includes a required arrival time acquisition unit 101 and a QoS control unit 103. The QoS control unit 103 includes a policer determination table 105 and a distribution function unit 107.

  The required arrival time acquisition unit 101 acquires the required packet arrival time from the packet source ER. Note that the packet arrival time includes not only actual measurement values from the ER to the GWR but also estimated values corresponding thereto. A plurality of policers in which different CIR / PIRs are set according to the time required for packet arrival are prepared. Policer CIR / PIR is set so that the ratio of green packets increases for flows with a long packet arrival time, and policer CIR / PIR is set so that the ratio of green packets decreases for flows with a short packet arrival time Is done. The QoS control unit 103 performs QoS control according to the packet arrival time. Specifically, the association between the ER and the policer is recorded in the policer determination table 105 of the QoS control unit 103 according to the required packet arrival time, and the distribution function unit 107 of the QoS control unit 103 stores the packet from the ER. When received, the packet is distributed with reference to the policer determination table 105. The distribution function unit 107 distributes packets to policers that are set so that the proportion of Green packets increases as the required packet arrival time increases, and decreases the packet discard rate. The distribution function unit 107 distributes packets to policers that are set such that the proportion of green packets decreases as the packet arrival time decreases, and increases the packet discard rate. Packets distributed to the policer are marked according to CIR / PIR, and Yellow and Red packets are randomly discarded in a congested state. Thereby, fair QoS control is realized.

  Note that the packet arrival time is acquired by one of the following methods.

  (Embodiment 1) Geographic distance information is determined from the IP (Internet Protocol) address of the transmission source ER, and the required arrival time is estimated from the distance information.

  (Embodiment 2) The transmission source ER assigns geographic location information to a packet as an identifier, and estimates the required arrival time from the identifier.

  (Embodiment 3) The transmission source ER assigns a TTL to the packet, and estimates the required arrival time from the remaining TTL value of the packet.

  (Embodiment 4) The ER attaches a tag storing the packet transmission time and transmits the packet, and the GWR measures the difference between the arrival time and the transmission time to obtain the required arrival time.

  (Embodiment 5) Using a packet transmission / reception function between ER and GWR such as Ping, GWR acquires RTT between ER and GWR.

  (Embodiment 6) Using a packet transmission / reception function between ER and GWR such as Ping, ER acquires RTT between ER and GWR, and ER transmits a packet with a tag storing RTT information.

<Example 1>
In the first embodiment, a specific example in which the geographical distance information is determined from the IP address of the transmission source ER and the required arrival time is estimated from the distance information will be described.

  FIG. 4 is a schematic diagram of QoS control according to the first embodiment of the present invention. Similar to FIG. 3, the GWR according to the embodiment of the present invention includes a required arrival time acquisition unit 101 and a QoS control unit 103. The QoS control unit 103 includes a policer determination table 105 and a distribution function unit 107.

  The required arrival time acquisition unit 101 estimates the required packet arrival time from the geographical distance information acquired based on the IP address of the transmission source ER. The arrival time acquisition unit 101 acquires the correspondence between the IP address of the ER and the location information from an operator, an orchestrator, an API (Application Programming Interface), and the like. Then, it estimates the time required to reach the packet from the IP address of the source ER, and calculates an approximate value of RTT. The QoS control unit 103 sets the CIR / PIR of the policer according to the required packet arrival time, and records the association between the ER and the policer in the policer determination table 105 according to the required packet arrival time. When the distribution function unit 107 receives a packet from the ER, the distribution function unit 107 distributes the packet with reference to the policer determination table 105.

  Next, a QoS control procedure in the first embodiment will be described with reference to FIGS. 4 and 5. FIG. 5 is a flowchart showing QoS control according to the first embodiment of the present invention.

  First, the GWR acquires the IP address and location information of the ER connected to itself by the required arrival time acquisition unit 101, and calculates an approximate value of the RTT between the ER and GWR (STEP 101 in FIG. 4).

  The QoS control unit 103 groups ERs into a plurality of groups according to the calculated RTT, and sets the CIR / PIR according to the RTT prediction result for the policer prepared for each group (STEP 151 in FIG. 5). STEP 103 in FIG. 4). Further, the QoS control unit 103 updates the policer determination table 105 so that the packet transmitted from each ER is assigned to an appropriate policer (STEP 153 in FIG. 5 and STEP 105 in FIG. 4). For example, when the GWR exists in Tokyo, the ER in Okinawa far from Tokyo is assigned to the policer 1 with a large CIR / PIR, and the ER in Saitama near Tokyo is assigned to the policer 3 with a small CIR / PIR.

  When receiving a packet from the ER (STEP 155 in FIG. 5), the GWR refers to the transmission source IP address in the tunnel header of the packet transmitted by the distribution function unit 107 and distributes the packet to an appropriate policer (in FIG. 5). STEP157, STEP107 of FIG. 4).

<Example 2>
In the second embodiment, a specific example will be described in which the transmission source ER assigns geographic location information to a packet as an identifier and estimates the required arrival time from the identifier.

  FIG. 6 is a schematic diagram of QoS control according to the second embodiment of the present invention. Similar to FIG. 3, the GWR according to the embodiment of the present invention includes a required arrival time acquisition unit 101 and a QoS control unit 103. The QoS control unit 103 includes a policer determination table 105 and a distribution function unit 107. Further, the ER according to the embodiment of the present invention includes an identifier assigning function unit 201.

  The identifier assigning function unit 201 assigns an identifier indicating its geographical position information to the packet. The required arrival time acquisition unit 101 estimates the required arrival time of the packet from the identifier indicating the geographical position information given to the packet in the transmission source ER, and calculates an approximate value of the RTT. The QoS control unit 103 sets the CIR / PIR of the policer according to the required packet arrival time, and records the association between the identifier and the policer in the policer determination table 105 according to the required packet arrival time. When the distribution function unit 107 receives a packet from the ER, the distribution function unit 107 distributes the packet with reference to the policer determination table 105.

  Next, a QoS control procedure in the second embodiment will be described with reference to FIGS. 5 and 6. Also in the second embodiment, QoS control is performed as in FIG.

  First, an identifier value assigned by each ER is set for each location (STEP 201 in FIG. 6). The GWR calculates the approximate value of the RTT between the ER and GWR from the identifier in the required arrival time acquisition unit 101.

  The QoS control unit 103 prepares a policer for each identifier, and sets a CIR / PIR value corresponding to each identifier (STEP 151 in FIG. 5 and STEP 203 in FIG. 6). Set a larger CIR / PIR for policers assigned to distant ERs. Note that policers may be collected at a plurality of locations. The QoS control unit 103 sets the policer determination table 105 according to the correspondence between the identifier and the policer (STEP 153 in FIG. 5 and STEP 205 in FIG. 6). For example, if GWR is in Tokyo, the identifier assigned to the ER in Okinawa far from Tokyo is assigned to policer 1 with a large CIR / PIR, and the identifier assigned to the ER in Saitama near Tokyo is low in CIR / PIR. Set to be assigned to policer 3.

  The ER sends a packet with an identifier, and when the GWR receives a packet from the ER (STEP 155 in FIG. 5), distributes the packet to an appropriate policer based on the identifier assigned by the distribution function unit 107 ( STEP157 in FIG. 5 and STEP207 in FIG. 6). Then, the distribution function unit 107 removes the identifier when transmitting the packet to the policer (STEP 209 in FIG. 6).

<Example 3>
In the third embodiment, a specific example will be described in which the transmission source ER attaches a TTL to a packet and estimates the required arrival time from the remaining TTL value of the packet.

  FIG. 7 is a schematic diagram of QoS control according to the third embodiment of the present invention. Similar to FIG. 3, the GWR according to the embodiment of the present invention includes a required arrival time acquisition unit 101 and a QoS control unit 103. The QoS control unit 103 includes a policer determination table 105 and a distribution function unit 107. Further, the ER according to the embodiment of the present invention includes a TTL conversion function unit 211. Note that the TTL conversion function unit 211 may exist in a device outside the ER.

  The TTL conversion function unit 211 converts the TTL of the outer tunnel header / IP header of the packet transferred from the ER to the GWR into a constant value so that the TTL of the packets output from all the ERs has the same value. The required arrival time acquisition unit 101 estimates the required packet arrival time from the remaining TTL value given to the packet in the transmission source ER, and calculates an approximate value of RTT. The QoS control unit 103 sets the CIR / PIR of the policer according to the required packet arrival time, and records the association between the remaining TTL value and the policer in the policer determination table 105 according to the required packet arrival time. When the distribution function unit 107 receives a packet from the ER, the distribution function unit 107 distributes the packet with reference to the policer determination table 105.

  Next, with reference to FIGS. 5 and 7, a QoS control procedure in the third embodiment will be described. Also in the third embodiment, QoS control is performed as in FIG.

  First, in all ER TTL conversion function units 211, the TTL of the output packet is set to the same value (STEP 301 in FIG. 7). For example, as shown in FIG. 7, the TTL of a packet output from Okinawa ER and Saitama ER is set to 10. The GWR calculates an approximate value of the RTT between the ER and GWR from the remaining value of TTL in the required arrival time acquisition unit 101.

  The QoS control unit 103 prepares a policer for each remaining TTL value, and sets a CIR / PIR value corresponding to the remaining TTL value (STEP 151 in FIG. 5 and STEP 303 in FIG. 7). A policer to which a packet with a small TTL is assigned sets a larger CIR / PIR. The QoS control unit 103 sets the policer determination table 105 according to the correspondence between the remaining TTL value and the policer (STEP 153 in FIG. 5 and STEP 305 in FIG. 7). For example, if GWR is located in Tokyo, a packet with a small TTL residual value from the Okinawa ER far from Tokyo is assigned to policer 1 with a large CIR / PIR, and a packet with a large TTL residual value from the Saitama ER near Tokyo. Is set to be assigned to policer 3 having a small CIR / PIR.

  The ER converts the TTL into a specific value and transmits the packet. When the GWR receives the packet from the ER (STEP 155 in FIG. 5), the distribution function unit 107 converts the packet to an appropriate policer based on the remaining TTL value. Sort (STEP157 in FIG. 5, STEP307 in FIG. 7).

<Example 4>
In the fourth embodiment, a specific example will be described in which the ER attaches a tag storing the packet transmission time and transmits the packet, and the GWR measures the difference between the arrival time and the transmission time to acquire the required arrival time.

  FIG. 8 is a schematic diagram of QoS control according to the fourth embodiment of the present invention. Similar to FIG. 3, the GWR according to the embodiment of the present invention includes a required arrival time acquisition unit 101 and a QoS control unit 103. The QoS control unit 103 includes a policer determination table 105 and a distribution function unit 107. In addition, the ER according to the embodiment of the present invention includes a tag addition function unit 221.

  The tag addition function unit 221 adds a tag storing transmission time information to a packet transferred from the ER to the GWR. The required arrival time acquisition unit 101 calculates the RTT that is the required arrival time of the packet from the difference between the transmission time and the arrival time given to the packet in the transmission source ER. The QoS control unit 103 sets the CIR / PIR of the policer according to the required packet arrival time, and records the association between the required arrival time and the policer in the policer determination table 105 according to the required packet arrival time. When the distribution function unit 107 receives a packet from the ER, the distribution function unit 107 distributes the packet with reference to the policer determination table 105.

  Next, a QoS control procedure in the fourth embodiment will be described with reference to FIGS. Also in the fourth embodiment, QoS control is performed as in FIG.

  The QoS control unit 103 prepares a policer for each required arrival time, and sets a CIR / PIR value according to the required arrival time (STEP 151 in FIG. 5 and STEP 401 in FIG. 8). A larger CIR / PIR is set for a policer to which a packet having a longer arrival time is assigned. The QoS control unit 103 sets the policer determination table 105 according to the correspondence relationship between the required arrival time and the policer (STEP 153 in FIG. 5 and STEP 403 in FIG. 8). For example, when GWR is located in Tokyo, a packet that has a long arrival time from the ER in Okinawa far from Tokyo is assigned to policer 1 with a large CIR / PIR, and a packet that has a short arrival time from the ER in Saitama near Tokyo. Is set to be assigned to policer 3 having a small CIR / PIR.

  Each ER attaches a tag storing transmission time information to the packet to be transmitted to the GWR, and transmits the packet (STEP 405 in FIG. 8). When the GWR receives a packet from the ER (STEP 155 in FIG. 5), the GWR calculates the required arrival time from the difference between the transmission time and the current time in the required arrival time acquisition unit 101, and the distribution function unit 107 Based on the required arrival time, the packet is distributed to an appropriate policer (STEP 157 in FIG. 5 and STEP 407 in FIG. 8). Then, the distribution function unit 107 removes the tag when transmitting the packet to the policer (STEP 409 in FIG. 8).

<Example 5>
In the fifth embodiment, a specific example in which the GWR acquires the RTT between the ER and GWR using the packet transmission / reception function between the ER and GWR such as Ping will be described.

  FIG. 9 is a schematic diagram of QoS control according to the fifth embodiment of the present invention. Similar to FIG. 3, the GWR according to the embodiment of the present invention includes a required arrival time acquisition unit 101 and a QoS control unit 103. The required arrival time acquisition unit 101 includes an RTT measurement function unit 109. The QoS control unit 103 includes a policer determination table 105 and a distribution function unit 107.

  The RTT measurement function unit 109 measures RTT, which is the time required to reach a packet to the ER to be connected, using a packet transmission / reception function such as Ping. The QoS control unit 103 sets the CIR / PIR of the policer according to the required packet arrival time, and records the association between the remaining TTL value and the policer in the policer determination table 105 according to the required packet arrival time. When the distribution function unit 107 receives a packet from the ER, the distribution function unit 107 distributes the packet with reference to the policer determination table 105.

  Next, a QoS control procedure in the fifth embodiment will be described with reference to FIGS. Also in the fifth embodiment, QoS control is performed as in FIG.

  The RTT measurement function unit 109 measures the RTT between each ER and GWR at regular intervals using Ping or the like (STEP 501 in FIG. 9).

  The QoS control unit 103 prepares a policer for each RTT range, and sets CIR / PIR values according to the RTT (STEP 151 in FIG. 5 and STEP 503 in FIG. 9). A policer to which a packet with a large RTT is assigned sets a larger CIR / PIR. At this time, CIR / PIR may be set according to the RTT measured by the RTT measurement function unit 109. The QoS control unit 103 sets the policer determination table 105 according to the correspondence between the RTT and the policer (STEP 153 in FIG. 5 and STEP 505 in FIG. 9). The policer determination table 105 records RTT measurement results, ER IP addresses, and policer correspondences.

  When the GWR receives a packet from the ER (STEP 155 in FIG. 5), the distribution function unit 107 distributes the packet to an appropriate policer based on the IP address (STEP 157 in FIG. 5 and STEP 507 in FIG. 9).

<Example 6>
In the sixth embodiment, the ER acquires the RTT between the ER and GWR using the packet transmission / reception function between ER and GWR such as Ping, and the ER attaches the tag storing the RTT information and transmits the packet. explain.

  FIG. 10 is a schematic diagram of QoS control according to the sixth embodiment of the present invention. Similar to FIG. 3, the GWR according to the embodiment of the present invention includes a required arrival time acquisition unit 101 and a QoS control unit 103. The QoS control unit 103 includes a policer determination table 105 and a distribution function unit 107. Further, the ER according to the embodiment of the present invention includes an RTT measurement function unit 231 and a tag addition function unit 233.

  The RTT measurement function unit 231 measures the RTT up to the connected GWR by a packet transmission / reception function such as Ping. The tag addition function unit 233 adds a tag storing RTT to a packet transferred from the ER to the GWR. The required arrival time acquisition unit 101 acquires the RTT that is the required arrival time of the packet from the tag attached to the packet in the transmission source ER. The QoS control unit 103 sets the CIR / PIR of the policer according to the required packet arrival time, and records the association between the remaining TTL value and the policer in the policer determination table 105 according to the required packet arrival time. When the distribution function unit 107 receives a packet from the ER, the distribution function unit 107 distributes the packet with reference to the policer determination table 105.

  Next, a QoS control procedure in the sixth embodiment will be described with reference to FIGS. Also in the sixth embodiment, QoS control is performed as in FIG.

  The RTT measurement function unit 231 measures RTT between the ER and the GWR at regular intervals using Ping or the like (STEP 601 in FIG. 10).

  The QoS control unit 103 prepares a policer for each RTT range, and sets CIR / PIR values according to the RTT (STEP 151 in FIG. 5 and STEP 603 in FIG. 10). A policer to which a packet with a large RTT is assigned sets a larger CIR / PIR. The QoS control unit 103 sets the policer determination table 105 according to the correspondence between the RTT and the policer (STEP 153 in FIG. 5 and STEP 605 in FIG. 10).

  Each ER attaches a tag storing RTT to the packet to be transmitted to the GWR, and transmits the packet (STEP 607 in FIG. 10). When the GWR receives the packet from the ER (STEP 155 in FIG. 5), the GWR acquires the RTT from the tag by the arrival time acquisition unit 101, and distributes the packet to an appropriate policer based on the RTT by the distribution function unit 107 (STEP157 in FIG. 5 and STEP609 in FIG. 10). Then, the distribution function unit 107 removes the tag when transmitting the packet to the policer (STEP 611 in FIG. 10).

<Effect of the embodiment of the present invention>
As described above, according to the embodiment of the present invention, it is possible to provide fair QoS by performing 2r3c / WRED control according to the packet arrival time at the aggregation base.

<Supplement>
For convenience of explanation, the ER and GWR according to the embodiment of the present invention are described using functional block diagrams. However, the ER and GWR according to the embodiment of the present invention may be hardware, software, or a combination thereof. It may be realized. For example, each functional unit of the ER and GWR may be realized by a CPU (Central Processing Unit) executing data and programs stored in a storage device or a memory device. Further, the embodiment of the present invention includes a program for causing a computer to realize the functions of the ER and GWR according to the embodiment of the present invention, a program for causing a computer to execute each procedure of the method according to the embodiment of the present invention, etc. May be realized. Furthermore, the functional units may be used in combination as necessary. In addition, the method according to the embodiment of the present invention may be performed in an order different from the order shown in the embodiment.

  As described above, the technique for providing fair QoS considering transfer delay in the transfer apparatus at the base where user traffic distributed over a wide area is aggregated has been described. However, the present invention is limited to the above embodiment. However, various modifications and applications are possible within the scope of the claims.

DESCRIPTION OF SYMBOLS 101 Arrival time acquisition part 103 QoS control part 105 Policer judgment table 107 Distribution function part 109 RTT measurement function part 201 Identifier assignment function part 211 TTL conversion function part 221 Tag assignment function part 231 RTT measurement function part 233 Tag assignment function part

Claims (5)

A gateway router that forwards packets from an edge router to a destination,
An arrival time acquisition unit for acquiring the packet arrival time from the edge router of the packet source;
A QoS control unit that performs QoS (Quality of Service) control according to the packet arrival time;
Gateway router with The packet arrival time is:
Arrival time estimated from geographical distance information obtained based on the IP (Internet Protocol) address of the source edge router,
Arrival time estimated from the identifier indicating the geographical location information given to the packet at the source edge router,
Arrival time estimated from the remaining value of TTL (Time To Live) attached to the packet at the source edge router,
Arrival time measured from the transmission time attached to the packet at the source edge router,
Time required for arrival acquired by the gateway router transmitting / receiving a packet to / from the source edge router, or time required for arrival acquired by transmitting / receiving the packet to / from the gateway router by the source edge router The gateway router according to claim 1, wherein   The gateway router according to claim 1, wherein the QoS control unit decreases the packet discard rate as the time required for reaching the packet increases. The gateway router has a plurality of policers in which different CIR (Committed Information Rate) and PIR (Peak Information Rate) are set according to the packet arrival time,
The gateway router according to claim 3, wherein the QoS control unit distributes a packet to a policer having a larger CIR and PIR as the time required for reaching the packet is larger. A QoS (Quality of Service) control method in a gateway router that forwards a packet from an edge router to a destination,
Obtaining a packet arrival time from the edge router of the packet source;
Implementing QoS control according to the packet arrival time;
QoS control method comprising:

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