Congestion control method, congestion control device, and congestion control program

Patent metadata

Field	Value
Publication number	US-2023370380-A1
Application number	US-202018030687-A
Country	US
Kind code	A1
Filing date	Oct 8, 2020
Priority date	Oct 8, 2020
Publication date	Nov 16, 2023
Grant date	—

Abstract

A congestion control method in an IP telephone system includes acquiring a number of simultaneous calls in one line shared by a plurality of IP telephones, acquiring a call time order corresponding to length of a call time for each call, and controlling a packet discard rate of each call on the basis of the number of simultaneous calls and the call time order. The packet discard rate of each call is set to a predetermined first upper limit value or less. In addition, the packet discard rate is set higher as the call time is longer, and the packet discard rate is set lower as the call time is shorter. Further, the packet discard rate of the latest call having the shortest call time is set to be equal to or less than a predetermined second upper limit value lower than the predetermined first upper limit value.

First claim

1 . A congestion control method in an Internet Protocol (IP) telephone system, comprising:
acquiring a number of simultaneous calls in a first line shared by a plurality of IP telephones; acquiring a call time order corresponding to a length of a call time for each call; and controlling a packet discard rate of each call based on the number of simultaneous calls and the call time order, wherein controlling the packet discard rate includes:
setting the packet discard rate of each call to be equal to or less than a predetermined first upper limit value,
setting the packet discard rate (i) higher for longer call times and (ii) lower for shorter call times, and
setting the packet discard rate of a latest call having the shortest call time is set to be equal to or less than a predetermined second upper limit value lower than the predetermined first upper limit value.

2 . The congestion control method according to claim 1 , wherein:
in a comparison method, the packet discard rate of each call is set to be equal to or less than the predetermined first upper limit value, the packet discard rate is set higher for longer call times, the packet discard rate is set lower for shorter call times, further the packet discard rate is set so that the packet discard rate linearly changes with respect to the call time order, a first call has a longest call time, a first state is a state in which the packet discard rate of the first call in the case of the comparison method reaches the predetermined first upper limit value, and in the first state, the packet discard rate of the latest call is set to be lower than that of the comparison method.

3 . The congestion control method according to claim 2 , wherein, in the first state, a function of the packet discard rate with respect to the call time order is convex upward.

4 . The congestion control method according to claim 2 , wherein controlling the packet discard rate includes, in the first state, based on the packet discard rate of the latest call by the comparison method being greater than 0 and equal to or less than the predetermined second upper limit value, setting the packet discard rate of the latest call to 0.

5 . The congestion control method according to claim 2 , wherein controlling the packet discard rate includes, in the first state, based on the packet discard rate of the latest call by the comparison method exceeding the predetermined second upper limit value, setting the packet discard rate of the latest call to the predetermined second upper limit value.

6 . The congestion control method according to claim 1 , further comprising:
based on establishment of a new call causing the number of simultaneous calls to exceed the maximum number of simultaneous calls, setting the packet discard rate to 100%.

7 . A non-transitory computer recording medium storing a congestion control program, wherein execution of the congestion control program causes one or more computers to perform operations comprising:
acquiring a number of simultaneous calls in a first line shared by a plurality of Internet Protocol (IP) telephones; acquiring a call time order corresponding to a length of call time for each call; and controlling a packet discard rate of each call based on the number of simultaneous calls and the call time order, wherein controlling the packet discard rate includes:
setting the packet discard rate of each call to be equal to or less than a redetermined first upper limit value,
setting the packet discard rate (i) higher for longer call times and (ii) lower for shorter call times, and
setting the packet discard rate of a latest call having the shortest call time to be equal to or less than a predetermined second upper limit value lower than the predetermined first upper limit value.

8 . A congestion control device in an Internet Protocol (IP) telephone system, comprising:
an information processing device, implemented using one or more computing devices, configured to perform operations comprising:
acquiring a number of simultaneous calls in a first line shared by a plurality of IP telephones,
acquiring a call time order corresponding to a length of call time for each call, and
controlling a packet discard rate of each call based on the number of simultaneous calls and the call time order,
wherein the information processing device is configured to:
set the packet discard rate of each call to be equal to or less than a predetermined first upper limit value,
set the packet discard rate (i) higher for longer call times and (ii) lower for shorter call times, and
set the packet discard rate of a latest call having the shortest call time is set to be equal to or less than a predetermined second upper limit value lower than the predetermined first upper limit value.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Nagase Fumiaki
• Ono Yu
• Kuriyama Keita
• Yoshioka Masafumi
• Miyagi Toshifumi
• Hasegawa Hitoshi
• Osaka Kazuo
• FUKUZONO Hayato
• Furuya Hiroyuki

Classifications

• H04W28/0289

  Congestion control (load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12) · CPC title

• H04L47/11 Primary

  Identifying congestion · CPC title

• H04L47/32

  by discarding or delaying data units, e.g. packets or frames · CPC title

• H04M7/006

  Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer (H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42) · CPC title