WO2005079019A1 - Procede et systeme de selection de paquets en fonction du volume emis par connexion - Google Patents
Procede et systeme de selection de paquets en fonction du volume emis par connexion Download PDFInfo
- Publication number
- WO2005079019A1 WO2005079019A1 PCT/FR2004/000094 FR2004000094W WO2005079019A1 WO 2005079019 A1 WO2005079019 A1 WO 2005079019A1 FR 2004000094 W FR2004000094 W FR 2004000094W WO 2005079019 A1 WO2005079019 A1 WO 2005079019A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- packet
- initial
- predetermined threshold
- packets
- count value
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/625—Queue scheduling characterised by scheduling criteria for service slots or service orders
- H04L47/6265—Queue scheduling characterised by scheduling criteria for service slots or service orders past bandwidth allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/52—Queue scheduling by attributing bandwidth to queues
- H04L47/522—Dynamic queue service slot or variable bandwidth allocation
Definitions
- the present invention relates to the transmission of information over a TCP / IP type data packet transmission network and more particularly to the management of TCP / IP packets.
- TCP / IP type data packet transmission network It is well known that the transmission of information on the Internet which uses the TCP / IP protocol takes place in the form of a packet or datagram transmission of a determined and standardized format.
- a connection between a transmitting device and a receiving device is therefore characterized by a succession of packet exchanges whose role is first to initialize the connection and then to transmit the data exchanged.
- the routing of these packets will take place in a variable manner depending on the network load. As a result, packets sent before others may be received after these.
- each TCP / IP packet contains in its header a serial number or count value.
- this value is initialized at the start of the connection by the sending device to a random value, for security purposes, so that a third party cannot, if not with difficulty, enter the exchange by simulating the creation of "authentic" packages. Then this number is incremented by 1, or by the number of bits / bytes of data transmitted in this packet, each time a new packet is transmitted.
- a priority management mechanism is based on the management of the volumes already transmitted by the connections: It is carried out by the installation of counters, one per connection, which keep in memory the volumes of data already transmitted and which are compared with each other or with a predetermined value to affect processing priorities.
- These systems have the drawback of requiring storage locations in order to be able to install a counter per connection, as well as means of processing important information since, on the arrival of each packet, it is necessary to update the corresponding counter, or create it if it is a new connection, compare it to determine the priority to be given to this packet and, when the connection is terminated (an event that is often difficult to determine) destroy the counter.
- the object of the invention is therefore to remedy these drawbacks by proposing a mechanism which is simple and quick to execute.
- the object of the invention is therefore a method of selection by a downstream device of the data packets of the connections of a network transmitted by at least one upstream device as a function of a predetermined threshold of the quantities of data transmitted by these connections, this method comprising - at the start of each connection, the initialization by each upstream device of a packet counter sent at an initial count value, the incrementation of a determined value of said counter at each packet transmitted, defining the current count value of the packet, and the copy of this current count value in the header of the packet, by the upstream device, reception by the downstream device of each IP packet of each connection, characterized in that it consists of: - choosing, at the upstream device, the initial count value from a set of predetermined initial values such as the difference between two consecutive initial values of this set is greater than the predetermined threshold, and - compare, at the level of the downstream device, the predetermined threshold with the difference between the current
- the object of the invention is also a system for generating packets of network connection data comprising means for transmitting packets connected to the network, these means for transmitting being connected to an information processing unit. and to information storage means comprising at least one register capable of storing the number of packets transmitted, the information processing unit comprising means for initializing this register at the start of the connection to an initial value of counting and means for incrementing the content of this register at each creation of a new packet and means for copying this register into a field of the current counting value of the header of the packet, characterized in that the means initialization comprises means for selecting the initial count value of each connection from a set of predetermined initial values such as the difference between two initial values consecu tives of this set is greater than a predetermined threshold, as well as a data packet transmission system of at least one connection of a network comprising packet reception means and packet transmission means connected to information processing means, each packet having in its header a current count value, characterized in that the information processing means further comprise a table of initial count values and means for calculating the
- FIG. 1 represents an overall diagram of a TCP / IP network
- - Figure 2 shows a simplified diagram of a TCP / IP packet header according to the standard
- - Figure 3 shows a symbolic diagram of the distribution of initial values according to the invention
- - Figure 4 shows a diagram of the count value according to the invention in a binary representation
- - Figure 5 shows a diagram of an upstream packet generation system
- - Figure 6 shows a diagram of a downstream packet transmission system.
- FIG. 1 represents an overall diagram of a TCP / IP network
- - Figure 2 shows a simplified diagram of a TCP / IP packet header according to the standard
- - Figure 3 shows a symbolic diagram of the distribution of initial values according to the invention
- - Figure 4 shows a diagram of the count value according to the invention in a binary representation
- - Figure 5 shows a diagram of an upstream packet generation system
- - Figure 6 shows a diagram of a downstream packet transmission system.
- FIG. 1 represents an overall diagram of a
- a packet or datagram, FIG. 2, is composed of a header 5 comprising predefined fields necessary for the correct routing of this packet, for example, the address of the sending computer and that of the receiving computer, and transmitted data 6.
- a counting field 7 This is generated by the transmitting device from an initial count value by having incremented it, ie by one unit per packet sent, ie the number of bits or bytes of data sent, since the start of the connection.
- the receiving device 2 can thus verify that it has received all the data correctly and put them back in order if necessary.
- the initial count value is chosen randomly from a limited and predefined number of count values PIN-], PIN 2 , ..., PIN n , thus constituting a set of predetermined initial values.
- PIN- limited and predefined number of count values
- PIN n a limited and predefined number of count values
- the difference between two consecutive initial values must be much greater than the predetermined threshold value th which is used to discriminate the packets.
- This list of initial count values is also known to downstream devices. Thus, when a packet arrives, the downstream device estimates the volume emitted on the connection by making the difference between the count value of the packet and the initial count value of the list which is immediately below it.
- the packet is part of a "short" connection and therefore receives a high priority, otherwise it is part of a "long” connection and then receives a low priority . It is remarkable to note that if the connection is long enough, the current count value can reach and exceed the initial count value PINj + i which, in the list, is immediately higher than the initial count value PINj, used to start the connection. Therefore, the downstream device then calculates the difference between the current count value and PIIVi and not PINj, which has the effect of incorrectly classifying the packet as belonging to a short connection, and this as long as this new difference is not greater than the predetermined value th.
- connection volumes follows a Pareto law. Thus, 80% of the volume is generated by 20% of the connections. By judiciously setting the predetermined threshold, this 20% or less will be considered as long connections.
- the error only occurs when a number of packets equal to or greater than PINj + i - PINj have already been transmitted, a difference which is much greater than the threshold value predetermined by the judicious choice of these values of initial counting. Consequently, erroneously classified packets are doubly rare: they belong to rare connections and they represent a small proportion of the packets sent by these connections.
- the invention thus advantageously makes it possible to sort the packets according to the volume emitted by the corresponding connection without having to manage a counter specific to this connection in each downstream device.
- An alternative implementation of the invention consists in choosing the initial count values so that an I-bit area of the counter is always initialized to zero. To do this, FIG. 4, the counter and its associated values, can be represented in the form of a field of n bits and can therefore take 2 n distinct values.
- the predetermined threshold value th is chosen to be equal to a power of 2 minus 1, or 2 m -1. In binary representation, th has the position bit m positioned at 0 and the other least significant bits positioned at one.
- the predetermined threshold value th is much lower than the maximum possible value of the counter, ie 2 ⁇ .
- the initial count values must also be much greater than th.
- at least one of the bits of the field [2 m , 2 l + m is set to 1 when the predetermined threshold value is reached.
- the difference made by the downstream device is in the form of a comparison with zero on the corresponding field to determine whether the packet belongs to a short or long connection, without it being necessary to maintain a table of the values of initial counting.
- Priority management is thus done by an extremely simple calculation which very advantageously solves the problems posed by the prior art.
- the least significant bits of the initial count values that is to say those having a weight less than m, are also initialized to zero. There are thus 2 n "(l + m) possible initial values since they were chosen from multiples of 2 l + m . However, it may be necessary, for safety reasons, to increase the number of values of the possible initial counting, in order to decrease the probability of drawing two identical numbers.
- the counter is a packet counter, it is possible to choose th, and therefore m, small, and therefore the number of initial values remains large enough for the random draw to be effective.
- the counter is a data byte counter, as in the TCP standard, th must be much larger, which limits the number of initial count values accordingly. For example, for packets of 1024 bytes which is a value very often encountered on the Internet, a connection is considered to be long when it contains more than 5 packets. For a packet count, this means that m is chosen equal to 2 or 3. But in the case of a count of bytes of transmitted data, m becomes equal to 12 or 13.
- a variant of the embodiment of the invention consists in drawing a certain number of least significant bits in the initial sequence number.
- the upstream device, transmitting the packets comprises, FIG. 5, means 8 for transmitting these packets connected to the network, such as, for example, an ethemet network card.
- An information processing unit 9 is connected to these transmission means 8 and to information storage means 10 such as, for example, random access memory.
- An address in this memory serves as a register 11 for counting the packets, or bytes, transmitted.
- the information processing unit 9 comprises means 9a for initializing this register 11 at the start of the connection to an initial count value chosen according to the methods explained above.
- These initialization means 9a also include means 9d for selecting the initial value from a set of predetermined values and means 9e for drawing random of the least significant bits of this initial value.
- the information processing unit 9 also includes means 9b for incrementing the content of this register 11 each time a new packet is transmitted, this incrementing being either by one, in the case of a packet counting , or the number of bytes of data transmitted in the packet. In the preferred embodiment of the invention, these incrementing means 9b comprise tilting means 9f at the value 1 of at least one bit of the field of I bit.
- the information processing unit 9 also includes means 9c for copying the value of this register 11 into the field of the current count value of the header of the packet.
- the downstream device, FIG. 6, is a packet transmission system.
- reception 12 and transmission 13 means are connected to an information processing unit 14 which further comprises a table 15 of initial count values and means 14a for calculating the difference between the current count value of the packet and the initial value of the table immediately lower than this one.
- This information processing unit 14 also comprises means 14b for comparing this difference with the predetermined threshold value th.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Sorting Of Articles (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/586,390 US7830790B2 (en) | 2004-01-16 | 2004-01-16 | Method for selecting packets in a data transmission network |
AT04702723T ATE398372T1 (de) | 2004-01-16 | 2004-01-16 | Verfahren und system zur sortierung von paketen, die auf dem verschickten volumen pro verbindung basiert |
EP04702723A EP1733515B1 (fr) | 2004-01-16 | 2004-01-16 | Procede et systeme de selection de paquets en fonction du volume emis par connexion |
PCT/FR2004/000094 WO2005079019A1 (fr) | 2004-01-16 | 2004-01-16 | Procede et systeme de selection de paquets en fonction du volume emis par connexion |
DE602004014413T DE602004014413D1 (de) | 2004-01-16 | 2004-01-16 | Verfahren und system zur sortierung von paketen, die auf dem verschickten volumen pro verbindung basiert |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR2004/000094 WO2005079019A1 (fr) | 2004-01-16 | 2004-01-16 | Procede et systeme de selection de paquets en fonction du volume emis par connexion |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005079019A1 true WO2005079019A1 (fr) | 2005-08-25 |
Family
ID=34855246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2004/000094 WO2005079019A1 (fr) | 2004-01-16 | 2004-01-16 | Procede et systeme de selection de paquets en fonction du volume emis par connexion |
Country Status (5)
Country | Link |
---|---|
US (1) | US7830790B2 (fr) |
EP (1) | EP1733515B1 (fr) |
AT (1) | ATE398372T1 (fr) |
DE (1) | DE602004014413D1 (fr) |
WO (1) | WO2005079019A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7433814B2 (en) * | 2004-09-30 | 2008-10-07 | Microsoft Corporation | Network emulator architecture |
US7339899B2 (en) * | 2004-09-30 | 2008-03-04 | Microsoft Corporation | Method and system for network emulation using packet reorder emulation techniques |
US7411908B2 (en) * | 2004-09-30 | 2008-08-12 | Microsoft Corporation | Method and system for network emulation using bandwidth emulation techniques |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030043802A1 (en) * | 2001-08-31 | 2003-03-06 | Takeki Yazaki | Packet transferring method and apparatus that employs the same |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5617561A (en) * | 1994-12-22 | 1997-04-01 | International Business Machines Corporation | Message sequence number control in a virtual time system |
-
2004
- 2004-01-16 WO PCT/FR2004/000094 patent/WO2005079019A1/fr active IP Right Grant
- 2004-01-16 US US10/586,390 patent/US7830790B2/en not_active Expired - Fee Related
- 2004-01-16 AT AT04702723T patent/ATE398372T1/de not_active IP Right Cessation
- 2004-01-16 DE DE602004014413T patent/DE602004014413D1/de not_active Expired - Lifetime
- 2004-01-16 EP EP04702723A patent/EP1733515B1/fr not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030043802A1 (en) * | 2001-08-31 | 2003-03-06 | Takeki Yazaki | Packet transferring method and apparatus that employs the same |
Non-Patent Citations (3)
Title |
---|
DEFENSE ADVANCED RESEARCH PROJECTS AGENCY INFORMATION SCIENCES INSTITUTE UNIVERSITY OF SOUTHERN CALIFORNIA: "RFC: 793, TRANSMISSION CONTROL PROTOCOL DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION", INTERNET ARTICLE, September 1981 (1981-09-01), XP015006775 * |
ESTAN C; VARGHESE G, DEPT. OF COMPUT. SCI. & ENG., CALIFORNIA UNIV., SAN DIEGO, CA; USA: "New directions in traffic measurement and accounting: focusing on the elephants, ignoring the mice", ACM TRANSACTIONS ON COMPUTER SYSTEMS, vol. 21, no. 3, August 2003 (2003-08-01), pages 270 - 313, XP002298877, ISSN: 0734-2071, Retrieved from the Internet <URL:http://delivery.acm.org/10.1145/860000/859719/p270-estan.pdf?key1=859719&key2=5712266901&coll=portal&dl=ACM&CFID=3957717&CFTOKEN=38351001> [retrieved on 20041001] * |
N. BROWNLEE; THE UNIVERSITY OF AUCKLAND; C. MILLS; GTE LABORATORIES, INC; G. RUTH; GTE INTERNETWORKING: "RFC 2722, Traffic Flow Measurement: Architecture", INTERNET ARTICLE, October 1999 (1999-10-01), XP015008505 * |
Also Published As
Publication number | Publication date |
---|---|
ATE398372T1 (de) | 2008-07-15 |
EP1733515B1 (fr) | 2008-06-11 |
EP1733515A1 (fr) | 2006-12-20 |
DE602004014413D1 (de) | 2008-07-24 |
US7830790B2 (en) | 2010-11-09 |
US20070165528A1 (en) | 2007-07-19 |
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