EP1201068A2 - Systeme de reseaux de protocole (ip) internet mobile avec fonctions d'agent local et/ou d'agent etranger reparties sur des dispositifs multiples - Google Patents

Systeme de reseaux de protocole (ip) internet mobile avec fonctions d'agent local et/ou d'agent etranger reparties sur des dispositifs multiples

Info

Publication number
EP1201068A2
EP1201068A2 EP00947387A EP00947387A EP1201068A2 EP 1201068 A2 EP1201068 A2 EP 1201068A2 EP 00947387 A EP00947387 A EP 00947387A EP 00947387 A EP00947387 A EP 00947387A EP 1201068 A2 EP1201068 A2 EP 1201068A2
Authority
EP
European Patent Office
Prior art keywords
agent
home
registration
foreign
tunneling
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP00947387A
Other languages
German (de)
English (en)
Inventor
Yingchun Xu
Kenneth L. Peirce
Matthew Harper
Timothy G. Mortsolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UTStarcom Inc
Original Assignee
3Com Corp
UTStarcom Inc
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
Priority claimed from US09/354,659 external-priority patent/US6738362B1/en
Application filed by 3Com Corp, UTStarcom Inc filed Critical 3Com Corp
Publication of EP1201068A2 publication Critical patent/EP1201068A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]

Definitions

  • This invention relates generally to systems that provide mobile Internet Protocol (IP) networking, wherein a mobile communications device such as a portable laptop computer or personal digital assistant may communicate with a host computer on an IP network. More particularly, the invention relates to the architecture and arrangement of communications devices functioning as home agents and foreign agents that are used in such a system.
  • IP Internet Protocol
  • Public packet switched networks can be used to carry traffic to and from a mobile communications device, such as a laptop computer or personal digital assistant equipped with a cellular telephone modem.
  • a mobile communications device such as a laptop computer or personal digital assistant equipped with a cellular telephone modem.
  • the basic architecture of mobile IP data networking is known in the art and described in several publications, including the Request for Comments document RFC 2002 (1996) and in the textbook of Charles E. Perkins, Mobile IP Design Principles and Practices, Addison-Wesley Wireless Communications Series (1998), both of which are fully incorporated by reference herein. Persons skilled in the art of mobile IP data networking are familiar with the contents of both of these documents and the devices used to implement mobile IP data networking in practice.
  • a wireless mobile node 10 communicates with a target host 12 on an IP network 14 by means of two devices, a "foreign agent" 16 and a "home agent” 18.
  • foreign agent functionality is incorporated into a router or network access server chassis located on a mobile node's visited network 20.
  • a radio access network linking the mobile node to the foreign agent 16 is not shown for purposes of simplicity in the present discussion.
  • the foreign agent 16 provides routing services for the mobile node while it is registered with the home agent 18.
  • the foreign agent 16 de-tunnels and delivers datagrams to the mobile node 10 that were tunneled by the mobile node's home agent 18.
  • the term "tunneling” refers to packet re-addressing, such as performed by the home agent.
  • the traffic exchanged between the foreign agent 16 and the home agent 18 includes control traffic 22, e.g., registration request and registration reply messages and session control messages, and data traffic 24.
  • the control traffic 22 terminates at the home agent.
  • the data traffic 24 is routed from the mobile node's home network 26 to a second network 14 for delivery to the target host.
  • the target host could be connected to the home network by any arbitrary number of intermediate IP networks, or could be on the mobile node's home network 26.
  • the home agent 18 is typically implemented in a router on a mobile node's home network 26.
  • the home agent maintains current location information for the mobile node, through a variety of possible mechanisms, such as described in the patent application of Richard J. Dynarski, et al., "Dynamic Allocation of Wireless Mobile Nodes Over an Internet Protocol (IP) Network", serial no. 09/233,381, which is incorporated by reference herein.
  • IP Internet Protocol
  • the home agent(s) are providing, in essence, a service analogous to virtual private network services.
  • Each mobile node is typically associated with a separate home network and the routing path from that home network, through the home agent, to the foreign agent and mobile node is like a virtual private network for the mobile node.
  • the home agent performs two separate and distinct tasks for the foreign agent and mobile node.
  • the home agent 18 must perform an authentication and registration process to determine whether the mobile node is authorized to access the home network 26. This may involve checking the identification of the mobile node (such as, through use of the mobile node's unique serial number or manufacturing number), password authentication, and possibly checking that the mobile node's account is current and paid in full.
  • the home agent registration and authentication functions may be performed in conjunction with, or with the assistance of, a second device, such as an authentication, authorization and accounting server such as a RADIUS server. See the patent application of Yingchun Xu, Serial No. 08/887,313 filed July 3, 1997 for further details.
  • the home agent 18 has to tunnel data from the target host to the foreign agent, and provide tunneling services in the reverse direction, i.e., provide packet readdressing for traffic from the foreign agent to the host 12.
  • the home agent provides a forwarding "care/of address to the foreign agent to tell the foreign agent 16 where to tunnel traffic from the mobile node so that it can be sent to the host.
  • This forwarding address is typically contained in a registration reply message sent to the foreign agent notifying the foreign agent that the mobile node is authenticated to communicate in the home network.
  • the home agent is also the device that receives the tunneled traffic from the foreign agent for routing onto the home network, and therefore the forwarding address is the home agent's IP address.
  • the foreign agent also has to perform two distinct tasks for the mobile node, similar to that of the home agent.
  • the foreign agent has to handle the registration and session control aspects for the mobile node, including sending registration request messages to the home agent and processing a registration reply message.
  • the foreign agent has tunneling responsibilities for forwarding data packets to the home agent for ultimate distribution to the destination, and de-tunneling data from the home agent and forwarding the data to the mobile node.
  • the known prior art for providing mobile IP networking services has embraced the concept of a single home agent, in a single chassis, for a given network.
  • some larger scale providers of Mobile IP networking services may require multiple home agents on their networks in order to meet demand for mobile IP network services for a large distributed customer base.
  • the present invention represents an improvement to the above approaches contemplated by the prior art.
  • the present invention contemplates distributing the home agent functionality across multiple devices, with one device devoted to handing the registration and authentication functions, and another device devoted to the routing and tunneling functions of a home agent.
  • the present inventors have appreciated that the former functions, i.e., registration and authentication, are not particularly computationally intensive, and that a single general purpose computing device can handle a very large number of simultaneous registration and authentication transactions without any undue latency, management, or other problems, either alone or in concert with a RADIUS or Authorization, Authentication, and Accounting (AAA) server.
  • RADIUS Authorization, Authentication, and Accounting
  • the routing and inverse tunneling functions of a home agent are more CPU- intensive and better suited to more robust devices designed for such purposes, such as switches and routers.
  • the present distributed home agent design of the present invention overcomes the scaling and management problems presented by prior art approaches and represents a simple, cost effective, and easily managed solution for providing mobile IP network services, particularly for large scale providers of such services.
  • the functionality of a single foreign agent is distributed across multiple devices.
  • the registration and session control functions of a foreign agent are assigned to a first device, referred to herein as a "foreign registration agent", such as a general purpose computer or network access server on the visited network.
  • the tunneling functions of the foreign agent are assigned to one or more different devices, referred to herein as a “foreign tunneling agent.”
  • the foreign registration agent would exchange registration and session control messages with the home registration agent. The tunneling of data traffic between the mobile node and the host system would occur between the home tunneling agent and the foreign tunneling agent.
  • the present invention is an improvement to a system that provides mobile Internet Protocol networking for a mobile node via a foreign agent and a home agent.
  • the improvement comprises implementing the home agent in two separate entities or devices. These two separate entities comprise (1) a home registration agent handling registration requests for the mobile node, and (2) a home tunneling agent receiving traffic from the mobile node via the foreign agent and redirecting the traffic to a destination for the traffic.
  • the home registration agent generates a registration reply message in response to a registration request message associated with the mobile node. The home registration agent sends the registration reply message to the foreign agent.
  • the registration reply message contains an address associated with the home tunneling agent, such as an IP address of the home tunneling agent, whereby the foreign agent tunnels the traffic from the mobile node to the home tunneling agent for transmission to the destination for the traffic.
  • An extension to the mobile IP protocol can be used as a means for including the home tunneling agent's network address in the registration reply message.
  • a mobile Internet Protocol service provider system provides access to a network for a mobile node and enables the mobile node to communicate with a host on the network.
  • the system comprises a first communications device comprising a home registration agent responsive to a registration request message associated with the mobile node.
  • the system further includes a second communications device, different from the first communications device, comprising a home tunneling agent associated with the home registration agent, the home tunneling agent receiving traffic from the mobile node and redirecting the traffic to the network.
  • the system is operated by a wireless communications service provider, and typically a wireless communications service provider that is serving a large number of wireless customers and therefore must provide for a high number of mobile nodes simultaneously.
  • the specific communication device that is used to implement the home registration agent and the home tunneling agent is not particularly important, but will be selected in view of the typical processing requirements of the home tunneling agents and the home registration agents.
  • the home tunneling agent comprises a router.
  • a machine for authenticating a mobile node for network access.
  • the machine implements just the registration part of a home agent function, with the tunneling part of the home agent function being taken up by a separate device such as a router.
  • the machine which may be implemented as a general purpose computer or other suitable device, includes a central processing unit, an interface to the network, and a machine readable storage medium comprising a set of instruction for processing registration request messages associated with the mobile node and responsively generating registration reply messages.
  • the registration reply message contains a field containing a network address for a home tunneling agent.
  • the network address of the home tunneling agent is different from a network address assigned to the machine, because the home tunneling agent function is being performed in the separate device.
  • a method for authenticating a mobile node for network access.
  • a registration request message is generated and sent from a foreign agent to a home registration agent.
  • the registration request message contains information used to determine whether said mobile node is authorized to access a network, such as the mobile device's unique International Mobile Subscriber Identity (IMSI) number and/or its Electronic Serial Number (ESN).
  • IMSI International Mobile Subscriber Identity
  • ESN Electronic Serial Number
  • the home registration agent determines from the information in the registration request message whether the mobile node is permitted to access the network. This step may be performed with the assistance of a authorization, authentication and accounting server, e.g., a RADIUS server.
  • the home registration agent then generates a registration reply message and sends the registration reply message from the home registration agent to the foreign agent.
  • the home registration includes in the registration reply message a network address of a home tunneling agent.
  • the home tunneling agent is adapted to receive data traffic from the mobile node and direct the traffic onto the network.
  • the foreign agent forwards data traffic from the mobile node to the home tunneling agent for transmission to the host or destination.
  • the home registration agent and the home tunneling agent are preferably implemented in two separate communications devices. Similarly, the foreign agent functionality may be split up into two separate devices, one functioning as a foreign tunneling agent and another device functioning as a foreign registration agent.
  • the foreign and home registration agents exchange the registration and session control messages, while the tunneling activity is handled by foreign and home tunneling agents.
  • Figure 1 is an illustration of a p ⁇ or art mobile IP networking system
  • Figure 2 is an illustration of a mobile IP networking system in accordance with a preferred embodiment of the invention, with the home tunneling agent and home registration functions being separated and performed to two separate devices
  • Figure 3 is an illustration of a mobile IP Protocol extension that could be used by the home registration agent to transmit the IP address of the home tunneling agent and thereby inform the foreign agent where to tunnel traffic from the mobile node destined for the target host
  • FIG. 4 is an illustration of a mobile IP networking system in accordance with an alternative embodiment of the invention in which the foreign agent functions are separated into two separate devices, a foreign registration agent and a foreign tunneling agent, and
  • Figure 5 is an illustration of an architecture for mobile IP networking m which the foreign agent functions and the home agent functions are both split up into multiple separate devices
  • the home agent function as provided by RFC 2002 is separated and performed by two (or more) separate devices.
  • device 18A is designated as a home registration agent, dedicated to registration of mobile nodes
  • the other device 18B is designated as a home tunneling agent.
  • the home agent function is split up into one home registration agent 18A and one home tunneling agent 18B.
  • the home agent functionality specified in RFC 2002 is broken up in to two basic tasks: registration of mobile nodes and tunneling/routing for the mobile nodes and foreign agents, with the registration function being performed by a home registration agent 18 A, and the tunneling and routing functions being performed by the home tunneling agent 18B.
  • a need for more than one home tunneling agent per home registration agent may exist, depending on the size of the mobile IP customer base, the capacity or utilization of the router chosen to implement the home tunneling agent function, or other factors.
  • control traffic 22 consisting of, among other things, registration request messages and registration reply messages, is exchanged between the foreign agent 16 and the home registration agent 18 A.
  • the foreign agent 16 could be embodied in one device, or could be broken up into two separate devices, a foreign registration agent and a foreign tunneling agent, as explained below.
  • the home registration agent 18 A does not receive or process the underlying data traffic 24 going to and from the foreign agent and mobile node. This data traffic is instead sent to the home tunneling agent 18B, which handles all the routing and tunneling functions for the foreign agent and mobile node. While the situation illustrated in Figure 2 shows only one mobile node 10, it will be appreciated that in practice the registration and tunneling functions will be performed simultaneously and in parallel for many mobile nodes at once.
  • the home registration agent 18 A will be typically implemented as a machine such as a general purpose computer loaded with a software program having a set of instructions for handling registration request messages from foreign agents pursuant to RFC 2002. Such software programs are either known to persons skilled in the art or readily developed from the RFC 2002 document.
  • the home registration agent 18A tells the foreign agent where to tunnel data traffic 22 by sending an IP address of the home tunneling agent 18B to the foreign agent, as described in further detail below.
  • the home tunneling agent 18B receives traffic from the mobile node via the foreign agent and redirects the traffic to a destination for the traffic, such as the host computer 12 on the network 18. Similarly, the home tunneling agent 18B tunnels traffic from the host 12 to the foreign agent 16 for delivery to the mobile node 10. Since the home tunneling agent will likely be performing home tunneling agent functions for a large number of mobile nodes simultaneously, the device that is designated to perform the home tunneling agent function should be the type of robust device that is designed to perform such functions. An IP router would be a suitable device for the home tunneling agent 18B.
  • the home registration agent 18A will serve a plurality of mobile nodes simultaneously, and potentially thousands of such nodes.
  • the home registration agent works in conjunction with a plurality of home tunneling agents so that the tunneling function for all the mobile nodes can be distributed across more than one tunneling agent.
  • a distributed base of home tunneling agents also facilitates load balancing among the tunneling agents, and provides some redundancy and fail-over capacity in the event that one of the home tunneling agents experiences hardware or software problems, or needs to be taken off line for maintenance, upgrading, repair, etc.
  • a mobile node 10 establishes a PPP connection with a foreign agent 16 over a wireless service provider network (not shown).
  • the foreign agent 16 forwards a registration request message to the home registration agent 18A.
  • the details of a registration request message are set forth in RFC 2002.
  • the home registration agent 18A receives the registration request message and generates a registration reply message, indicating whether the mobile node 10 is allowed to access the network 26.
  • the home registration agent may perform this authentication function alone, or, more preferably, with a separate AAA or RADIUS server 30.
  • the details of registration of a mobile node are not considered particularly important for the present invention and are known to persons skilled in the art.
  • the registration reply message is then sent from the home registration agent 18 A to the foreign agent 16.
  • the registration reply message contains an IP address assigned to a home tunneling agent 18B that is designated to handle the tunneling and routing functions for data traffic between the mobile node and the host 12.
  • the foreign agent 16 tunnels data traffic from the mobile node to the home tunneling agent for transmission to the destination for the traffic, such as the host 12.
  • the home tunneling agent 18B tunnels data traffic from the host 12 to the foreign agent for transmission over the PPP connection to the mobile node 10.
  • the system includes a first communications device 18 A, such as a general-purpose computer, comprising a home registration agent responsive to a registration request message associated a mobile node and generating a registration reply message.
  • the system also includes a second communications device 18B, embodied in platform or device different from the first communications device, comprising a home tunneling agent associated with the home registration agent.
  • the home tunneling agent receives traffic from the mobile node and directs the traffic to the network.
  • the system may be operated by any suitable entity, for example by a wireless communications service provider.
  • the wireless communications service provider may furnish all the basic elements for providing mobile IP services, such as the foreign agents, and the home registration and home tunneling agents. Or, the entity may simply provide home tunneling and home registration agents, and work with other entities that own or manage the foreign agents.
  • At least one of the first and second communications devices implementing the home registration agent and home tunneling agents, respectively, comprises a router. Since the functions provided by the home tunneling agent 18B are more directly analogous to IP routing functions performed by routers, the home tunneling agent function will normally be performed in a router. Other devices could be used, however.
  • a number of different communications devices are all suitable platforms for implementation as a home registration agent.
  • One example is a general-purpose computer.
  • Another example would be an AAA or RADIUS server.
  • Another example would be a router.
  • the home registration agent 18A will typically comprise a machine having a central processing unit, an interface to a network, and a machine readable storage medium (such as EPROM, ROM or other type of memory device) containing a set of instructions for processing registration request messages associated with a mobile node and responsively generating registration reply messages.
  • a machine readable storage medium such as EPROM, ROM or other type of memory device
  • the registration reply message contains a field containing a network address for a home tunneling agent.
  • This may be embodied as an extension to the mobile IP protocol specified in RFC 2002.
  • the mobile IP protocol in RFC 2002 supports the separating of foreign agent addresses and foreign agent care of addresses.
  • a new extension as shown in Figure 3 is defined. This extension will be carried inside a Mobile IP Registration Reply message when the mobile node 10 has been successfully authenticated.
  • the four byte home agent care-of- address field 32 comprises the IP address of the home tunneling agent.
  • the foreign agent tunnels traffic to this address as described above. If the extension of Figure 3 does not appear in the Registration Reply message, the foreign agent must use the home registration agent IP address as the home agent care of address.
  • multiple home registration agent or home tunneling agent functions could be implemented within a single chassis.
  • the multiple home registration agents are implemented as multiple instantiations or threads of a home registration agent software program in a general purpose computer or other suitable device running a Microsoft Windows NT or a similar operating system. Each instantiation of the software would run independently of the other software instantiations and process registration requests and generate registration replies independent of the other software- instantiated home registration agents.
  • multiple home tunneling agents could be implemented as multiple software instantiations running simultaneously in a router or switch.
  • multiple home tunneling agents could be provided in a single router, as separate instantiations of a home tunneling agent software program. Each instantiation or thread would be assigned a unique IP address so that each session for multiple mobile nodes can be kept separate in the single router.
  • the functions of a foreign agent can be grouped into two groups that mirror the functions performed by the home agent: (1) session control and registration functions, and (2) tunneling and packet capsulation/decapsulation.
  • the foreign agent functions are separated out into multiple devices.
  • the session control and registration functions for the mobile node 10 are performed in one device (such as general purpose computer) identified as a foreign registration agent (FRA) 16B.
  • FSA foreign registration agent
  • the tunneling and packet capsulation/decapsulation functions are distributed among three different foreign tunneling agents (FTA), 16 A, 16C and 16D.
  • FSA foreign tunneling agents
  • 16 A, 16C and 16D may be implemented as network access servers of the general type described in the patent to Dale M. Walsh et al., US Patent 5,528,595.
  • the node 10 since the node 10 is by definition a mobile node, it may likely go out of range in the wireless network of the foreign tunneling agent 16A, and be in the position represented by reference numeral 10'.
  • the hand-off of tunneling duties between the FTA 16A and the new FTA 16C can be effectuated without the need for re-registration of the mobile node via the foreign registration agent 16B, home registration agent 18 A, AAA server 30, etc. Instead, a new care of address assigned to the foreign tunneling agent 16C would be sent to the home tunneling agent 18B notifying it where to tunnel data traffic from the host 12 to the foreign tunneling agent.
  • FIG 5 another possible architecture is illustrated for mobile IP networking in which the foreign agent functions and the home agent functions are both split up into multiple separate devices.
  • the foreign agent function is broken down into one foreign registration agent 16B in one device and a plurality of foreign tunneling agents 16A, 16C and 16D embodied another device, such as a router or network access server.
  • the foreign registration agent 16B is responsible for agent discovery procedures and mobile node registration relay, as provided in RFC 2002.
  • the foreign registration agent exchanges session control and registration messages with the home registration agent (HRA) 18 A, as shown in the drawing.
  • the home registration agent 18A may authenticate and register the mobile node alone or in conjunction with an AAA or RADIUS server.
  • the foreign tunneling agents are managed by the foreign registration agent 16B, such as using a simple network management protocol (SNMP) packet or otherwise. In the illustration, there are 3 such foreign tunneling agents 16 A, 16C and 16D.
  • SNMP simple network management protocol
  • the three foreign tunneling agents are implemented in a separate device from the foreign registration agent.
  • the three foreign tunneling agents could be embodied in 3 different IP routers, or, as indicated in the drawing, as three different instantiations of a foreign tunneling agent software program in a single IP router.
  • the foreign tunneling agents are responsible for IP packet capsulation decapsulation and IP packet tunneling and forwarding as described in RFC 2002. They forward data traffic 24 to and receive data traffic 24 from the home tunneling agents 18B, 18C, and 18D.
  • the distribution of foreign agent functionality across multiple devices allows for load balancing among foreign tunneling agents and provides some redundancy and fail-over capacity.
  • the architecture of Figure 5 also has advantages in that it is readily adaptable

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Dans cette invention, un système fournissant un service de protocole Internet mobile met en oeuvre une fonctionnalité d'agent local dans deux dispositifs séparés. Dans le premier dispositif, l'agent d'enregistrement local est consacré à l'enregistrement du noeud mobile et du contrôle de session. L'autre dispositif, l'agent tunnel local, est consacré à des fonctions de routage et d'effet tunnel pour l'agent étranger. L'agent d'enregistrement local peut être un calculateur universel. L'agent tunnel local est de préférence mis en oeuvre dans un dispositif de routage cohérent, tel qu'un commutateur IP ou un routeur. En outre, de multiples agents tunnel locaux ou agents d'enregistrement locaux peuvent être mis en oeuvre dans chacun des dispositifs sous la forme d'instanciations multiples d'un agent d'enregistrement local ou d'un programme logiciel d'agent tunnel local. La fonctionnalité de l'agent étranger pour le système de réseaux IP mobiles peut être aussi séparée en deux dispositifs distincts. Dans un mode de réalisation préféré, un agent d'enregistrement étranger gère le contrôle de session et le trafic d'enregistrement avec l'agent d'enregistrement local, et un agent tunnel étranger fournit des services de capsulation/décapsulation de paquets et de routage au noeud mobile et échange des données de trafic avec l'agent tunnel local.
EP00947387A 1999-07-16 2000-07-14 Systeme de reseaux de protocole (ip) internet mobile avec fonctions d'agent local et/ou d'agent etranger reparties sur des dispositifs multiples Ceased EP1201068A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/354,659 US6738362B1 (en) 1999-02-25 1999-07-16 Mobile internet protocol (IP) networking with home agent and/or foreign agent functions distributed among multiple devices
US354659 1999-07-16
PCT/US2000/019280 WO2001006734A2 (fr) 1999-07-16 2000-07-14 Systeme de reseaux de protocole (ip) internet mobile avec fonctions d'agent local et/ou d'agent etranger reparties sur des dispositifs multiples

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EP1201068A2 true EP1201068A2 (fr) 2002-05-02

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