WO2002017667A1 - Renouvellement de la concession d'une adresse ip dans un reseau mobile - Google Patents

Renouvellement de la concession d'une adresse ip dans un reseau mobile Download PDF

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Publication number
WO2002017667A1
WO2002017667A1 PCT/EP2000/008098 EP0008098W WO0217667A1 WO 2002017667 A1 WO2002017667 A1 WO 2002017667A1 EP 0008098 W EP0008098 W EP 0008098W WO 0217667 A1 WO0217667 A1 WO 0217667A1
Authority
WO
WIPO (PCT)
Prior art keywords
network node
address
predetermined period
response
time
Prior art date
Application number
PCT/EP2000/008098
Other languages
English (en)
Inventor
Juha A. RÄSÄNEN
Original Assignee
Nokia Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Corporation filed Critical Nokia Corporation
Priority to PCT/EP2000/008098 priority Critical patent/WO2002017667A1/fr
Priority to AU2000265718A priority patent/AU2000265718A1/en
Publication of WO2002017667A1 publication Critical patent/WO2002017667A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5053—Lease time; Renewal aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5046—Resolving address allocation conflicts; Testing of addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

Definitions

  • the present invention relates to a network control device and a method for controlling the validity of an address of a network node.
  • the "leasing" (i.e., allocation) of a dynamic IP (Internet Protocol) address by a mobile node is carried out using a DHCP (Dynamic Host Configuration Protocol) operation.
  • the leasing is valid for a certain period of time after which it shall be renewed, if the mobile node still wants to be operative in its foreign location, i.e., wi ' th the allocated IP address.
  • the address allocated by the DHCP server to the mobile node may change, i.e. the address may be different than the address of the previous leasing period.
  • the DHCP packets are regarded by the MT as user packets. That is, the MT cannot be aware of any IP address changes which are notified within the DHCP packets.
  • exchange of the DHCP packets is only effected between the TE and the LNS. That is, after the above-mentioned lease period has elapsed, only the TE (terminal equipment with the mobile DHCP client) and the DHCP server know if the IP address of the terminal changes during the lease renewal process.
  • the message exchange between the mobile DHCP client (in TE) and the DHCP server is transparent (i.e. relayed ignoring the contents) to the intermediate network nodes.
  • the GGSN could monitor the data traffic in order to recognize messages between DHCP clients and servers and to compare the addresses in leasing renewals to the old addresses. If the IP address changes during the leasing renewal process, the GGSN could adopt the new address and deliver it further to the SGSN or possibly clear the PDP context if a complete setup procedure is required.
  • a network control device for controlling the validity of an address of a network node, comprising a first timer for waiting for elapsing of a first predetermined period of time; a sending means for sending a check message to a predetermined network node after elapsing of the first predetermined period of time; and a deciding means for deciding whether an address of the predetermined network node is still valid based on whether a response sent from the network node is received or not.
  • Sending of the check message can be repeated for a predetermined number of times in case no response is received. That is, before finally deciding that no response is received, several trials are allowed. Thus, possible lost of the check message due to transmission problems can be considered.
  • above-described method can further comprise the steps of waiting for elapsing of a second predetermined period of time; sending a check message to the predetermined network node; deciding whether an address of the predetermined network node is still valid based on receiving a response from the network node or not; wherein thereafter the waiting step for waiting for elapsing of the first predetermined period, the sending step and the deciding step are performed repeatedly until it is decided that no response is received.
  • the above described network control device may further comprise a second timer for waiting for elapsing of a second predetermined period of time; wherein the sending means is adapted to send a check message after elapsing of the second predetermined period of time, and wherein the first timer, the sending means and the deciding means are adapted to repeatedly measure the first predetermined period of time, to send a check message and to decide whether a response has been received until the decision means decides that no response is received.
  • a second predetermined period of time can be awaited before the above-mentioned steps are performed.
  • a lease time can be considered and less message -traffic is required since the repetition of sending of the check messages with the first predetermined period can be started only after elapsing of the first time period.
  • the second predetermined period may be selected to be longer than the first predetermined period .
  • the second predetermined period may be selected in accordance with a lease time period allocated to the address of the network node.
  • the network node may be a Dynamic Host Configuration Protocol (DHCP) client which receives its address using the DHCP.
  • DHCP Dynamic Host Configuration Protocol
  • the check message may be sent to the network node via the Packet Data Protocol (PDP) .
  • PDP Packet Data Protocol
  • the network control device may be a Gateway GPRS Support Node (GGSN)
  • GGSN Gateway GPRS Support Node
  • the network node may be a a network element such as Terminal Equipment (TE) being a part of a mobile station (MS) .
  • TE Terminal Equipment
  • MS mobile station
  • the network node may be an entity such as GGSN or HLR (Home Location Register) .
  • Fig. 4 a flowchart illustrating a procedure according to the first embodiment
  • Fig. 5 network nodes according to a second embodiment
  • Fig. 6 a flowchart illustrating a procedure according to the second embodiment.
  • Fig. 3 shows a network system according to a first embodiment. Apart from the GGSN, the network nodes concerned and the connections between them are similar to those shown in Fig. 2, thus a detailed description thereof is omitted.
  • the GGSN of Fig. 3 differs from that according to Fig. 2 in that the GGSN comprises a timer B. Furthermore, the GGSN is adapted to send a check message CM to the TE. This can be effected via the Point-to-Point Protocol as shown in Fig. 1, for example.
  • the function of the timer B and the 'check message is described in the following with respect to the flowchart shown in Fig. 4.
  • step SI the timer B is started.
  • the time period Tb to be measured by the timer B is set during an initialization procedure (for example, during start-up of the GGSN) to an appropriate value. This value may later be dynamically changed for example due to changing traffic load conditions in the network element or node.
  • step S2 it is checked whether the timer B has elapsed, i.e., whether the predetermined time period Tb has elapsed. If the time period Tb has elapsed, the process proceeds to step S3.
  • step S4 In case a response from the TE is received in step S4, the GGSN judges that the TE still recognizes its old IP address. Hence, the process returns to step SI again, such that the steps SI to S4 are repeated.
  • step S4 the GGSN judges that the TE does not recognize its old IP address anymore, i.e., the IP address has changed. Thus, in step S5, the GGSN initiates clearing (i.e., deactivation) of the PDP context. Thereafter, a new PDP context set up (activation) and IP address lease procedure is initiated. In step S6, the new IP address of the TE is obtained from the new PDP context. After this, the process returns to step SI, in which the process is repeated.
  • the IP address may still be valid although the GGSN now judges that the address is no longer recognized by the TE.
  • the steps S3 and S4 can be repeated a few times. In this way, it can be assured that non-receiving of a response of the TE is indeed caused by the fact that the IP address of the TE has changed.
  • the check messages are sent periodically to the TE after the activation of the PDP context.
  • the period is determined by the timer B, i.e., the time period Tb, and this period has to be set sufficiently small in order to detect an IP address change before excessive user data packets get lost. This is a process which is uncomplicated and easily to be implemented. However, it causes more message traffic since the check messages have to be sent relatively often.
  • Fig. 5 shows the network nodes according to the second embodiment.
  • the nodes are the same as those shown in Fig. 3, with the exception that the GGSN comprises an additional timer, the timer A.
  • the GGSN takes the lease time value from the registration message (which is described in documents IETF RFC2131 and 3G TS 29.061, for example) in the PDP context activation and registration procedure.
  • the lease time value is Tl as defined in RFC2131.
  • This lease time value i.e., the period of time during which 1 the ' IP address is reserved for the TE, is utilized for determining the time period Ta which is to be measured by the timer A.
  • Ta is set larger than half of the lease time and shorter that the lease time (half the lease time > Ta > lease time) .
  • the time period Ta is utilized in order to be aware when the DHCP client (i.e., the TE) is going to start renewing its address lease from the DHCP server.
  • step Sll the timer A is started.
  • step S12 it is checked whether the time period Ta has elapsed. If the time period Ta (i.e., the timer A) has elapsed, the process advances to step S13, in which a check message CM is sent to the TE.
  • step S14 it is checked whether a response is received from the TE.
  • the check message CM according to the second embodiment can be the same as in the first embodiment. Furthermore, also the modifications described in the second embodiment with respect to sending the check message and waiting for a response can be applied. That is, a certain delay for responding of the TE can be allowed, and in addition, the check message can be sent several times in order to make sure that the check message does not get lost on its way.
  • step S14 In case a response is received in step S14, it means that the TE still has its old IP address. The TE either has not yet renewed its address lease or has got its old address on the renewal. Thus, the process advances to step S15.
  • the steps S15 to S18 fully correspond to the steps SI to S4 according to the first embodiment, thus, a description thereof is omitted here. It is noted that also the modification of the first embodiment is applicable in the second embodiment.
  • step S5 the present PDP context is deactivated and a new PDP context is activated.
  • step S20 the new IP address of the TE and the lease time value of the new IP address is obtained from the new PDP context. Thereafter, the process returns to step Sll and is repeated.
  • the GGSN can always deactivate the PDP context after the expiration of the timer Ta (i.e. just before the lease time renewal is supposed to be initiated by the TE) .
  • the MT can monitor the message traffic going through it, study the IP address renewal messages, find out the change of the address and generate a deactivation of the PDP context. This requires that the MT is adapted to have an IP protocol stack in the current architecture.
  • the MT could monitor the PDP context activation and IP address lease messages and use the timers and send an address checking message to the TE as the GGSN in the primary solution above, and generate a deactivation of the PDP context. Again, this requires that the MT comprises an IP protocol stack in the current architecture . Alternatively, the MT can always generate a deactivation of the PDP context after the expiration of the timer Ta (i.e. just before the lease time renewal is supposed to be initiated by the TE) . This procedure would be very easy to implement since no check messages would have to be sent.
  • the above described procedures according to the first and second embodiments and the modifications thereof can be preferably applied to a case in which addresses are dynamically allocated using a DHCP operation.
  • the invention is not limited thereto and can be applied to every case in which an address change of a certain network element cannot be easily detected.

Abstract

L'invention concerne un procédé permettant de vérifier la validité d'une adresse d'un noeud de réseau. Ce procédé consistant à attendre (S2) l'écoulement d'une période prédéterminée (Tb); à envoyer (S3) un message de vérification (CM) à un noeud de réseau prédéterminé (TE); à décider (S4) si une adresse de ce noeud de réseau prédéterminé (TE) est encore valable selon qu'une réponse envoyée par le noeud de réseau (TE) est reçue ou non. Ce procédé permet de déterminer facilement si une adresse provisoirement attribuée d'un certain noeud de réseau est encore valable ou non. L'invention concerne également un dispositif correspondant de gestion de réseau.
PCT/EP2000/008098 2000-08-18 2000-08-18 Renouvellement de la concession d'une adresse ip dans un reseau mobile WO2002017667A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2000/008098 WO2002017667A1 (fr) 2000-08-18 2000-08-18 Renouvellement de la concession d'une adresse ip dans un reseau mobile
AU2000265718A AU2000265718A1 (en) 2000-08-18 2000-08-18 Renewal of ip address lease in a mobile network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2000/008098 WO2002017667A1 (fr) 2000-08-18 2000-08-18 Renouvellement de la concession d'une adresse ip dans un reseau mobile

Publications (1)

Publication Number Publication Date
WO2002017667A1 true WO2002017667A1 (fr) 2002-02-28

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WO (1) WO2002017667A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008045957A3 (fr) * 2006-10-10 2008-06-05 Qualcomm Inc Enregistrement d'un terminal auprès d'un serveur de localisation pour la localisation de plan utilisateur
DE102005000773B4 (de) * 2005-01-05 2011-12-01 Alpha Networks Inc. Verfahren zur Eingabe der Parameter einer IP Adresse in ein fernsteuerbares Netzwerkgerät
US9642513B2 (en) 2009-06-18 2017-05-09 Endochoice Inc. Compact multi-viewing element endoscope system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0883266A2 (fr) * 1997-05-12 1998-12-09 Kabushiki Kaisha Toshiba Dispositif de routage, procédé de transfert de datagrammes et système de communication réalisant le contrÔle de changement de cellules pour des terminaux mobiles
WO1999063774A1 (fr) * 1998-06-01 1999-12-09 Telefonaktiebolaget Lm Ericsson (Publ) Reseau de radiotelecommunication integre et procede d'interconnexion d'un reseau ansi-41 et le service general de radiocommunication par paquets (gprs)

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0883266A2 (fr) * 1997-05-12 1998-12-09 Kabushiki Kaisha Toshiba Dispositif de routage, procédé de transfert de datagrammes et système de communication réalisant le contrÔle de changement de cellules pour des terminaux mobiles
WO1999063774A1 (fr) * 1998-06-01 1999-12-09 Telefonaktiebolaget Lm Ericsson (Publ) Reseau de radiotelecommunication integre et procede d'interconnexion d'un reseau ansi-41 et le service general de radiocommunication par paquets (gprs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005000773B4 (de) * 2005-01-05 2011-12-01 Alpha Networks Inc. Verfahren zur Eingabe der Parameter einer IP Adresse in ein fernsteuerbares Netzwerkgerät
WO2008045957A3 (fr) * 2006-10-10 2008-06-05 Qualcomm Inc Enregistrement d'un terminal auprès d'un serveur de localisation pour la localisation de plan utilisateur
US9094784B2 (en) 2006-10-10 2015-07-28 Qualcomm Incorporated Registration of a terminal with a location server for user plane location
US9642513B2 (en) 2009-06-18 2017-05-09 Endochoice Inc. Compact multi-viewing element endoscope system

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