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WO2011054362A1 - Procédé et système des réseaux permettant d'offrir un accès à un réseau d'au moins un dispositif client par l'intermédiaire d'un réseau mobile - Google Patents

Procédé et système des réseaux permettant d'offrir un accès à un réseau d'au moins un dispositif client par l'intermédiaire d'un réseau mobile Download PDF

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Publication number
WO2011054362A1
WO2011054362A1 PCT/EP2009/007900 EP2009007900W WO2011054362A1 WO 2011054362 A1 WO2011054362 A1 WO 2011054362A1 EP 2009007900 W EP2009007900 W EP 2009007900W WO 2011054362 A1 WO2011054362 A1 WO 2011054362A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
client device
mobile
home
mobile device
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
PCT/EP2009/007900
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English (en)
Inventor
Marco Liebsch
Bernd Lamparter
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.)
NEC Europe Ltd
Original Assignee
NEC Europe Ltd
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 NEC Europe Ltd filed Critical NEC Europe Ltd
Priority to PCT/EP2009/007900 priority Critical patent/WO2011054362A1/fr
Publication of WO2011054362A1 publication Critical patent/WO2011054362A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • 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
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/005—Moving wireless networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/182—Network node acting on behalf of an other network entity, e.g. proxy

Definitions

  • the present invention relates to a method and a system of networks for providing access of at least one client device via a mobile network to a network which is related to the client device.
  • WLAN Wireless LAN
  • client devices or home devices attach to the local network at home via wireless technology, such as the Wireless LAN (WLAN) standard IEEE 802.11.
  • WLAN Wireless LAN
  • These devices include control ports for home automation or even portable LCD screens to display videos, which may be streamed from a home media server.
  • Such end devices have wireless support, but no mobility support like Mobile IP.
  • client devices are functional as long as they are attached to a home WLAN access point and will loose all connections when connecting to another access point in a different IP network. Usually it is also necessary to reconfigure the WLAN parameters before connecting to another WLAN access point.
  • state of the art technologies comprise protocols to support mobile networks.
  • these technologies assume a mobile network, which has a unique and different prefix from the mobile router's home network.
  • Home Forwarding Agents forward all packets, which address the mobile network prefix to the mobile router, whereas packets addressing a different prefix, such as the home local area network remain untouched.
  • a particular problem in this case is to distinguish at the home network which IP addresses it should proxy and forward to the mobile network and which IP addresses and associate clients are still connected at the home network, hence to forward packets between the home and clients in the mobile network only selectively.
  • State of the art technologies such as an lETF's protocol for Network Mobility (NEMO) according to Network Mobility Basic Support, RFC 3963 [1], do not solve the problem, as home and mobile network prefix are assumed to be different and all packets being addressed to the mobile prefix are forwarded to the mobile network by default, others remain untouched.
  • NEMO cannot differentiate the forwarding behavior for hosts physically located in the home network and hosts located in a remote network, i.e. mobile PAN (Personal Area Network) which may be served by a mobile router being attached to a mobile operator's network.
  • a remote network i.e. mobile PAN (Personal Area Network) which may be served by a mobile router being attached to a mobile operator's network.
  • FIG. 4 is showing a client which receives a new IP address in the mobile network and a Forwarding Agent which forwards only packets addressed to the mobile prefix.
  • a session of the client device is broken during movement of the client device away from the home network.
  • Fig. 5 is showing a situation where a registered mobile PAN has the same prefix as the home LAN. However, the Forwarding Agent does not know which packets it shall proxy/forward and which not. Thus, there is a conflict at the Forwarding Agent and there are no means for the forwarding agent to distinguish home devices at home from devices being attached to the mobile Personal Area Network.
  • [2] considers home network mobility models based on different organizations of the home model.
  • the model of the extended home network assumes the home network to be a subset of a larger aggregation that encompasses the mobile network.
  • the mobile router When being connected at the home network, the mobile router still performs routing between the home network and the clients.
  • the model of the aggregated home network still requires that the mobile router at home bridges between the home network and the clients, as the home network simply represents an aggregate of multiple mobile networks.
  • a third model for virtual home networks assumes that the mobile router emulates a home network to clients, but without existence of a physical home network. None of these approaches match the scenario addressed in this document.
  • a further limitation of [1] and [2] is support of IPv6 only.
  • Mobile IPv4, RFC 3344, [3] represents the standard of Mobile IPv4.
  • the clients attaching to the cellular mobile phone with a single IP address could be understood as mobile nodes, which attach to a Mobile IPv4 Foreign Agent.
  • mobile nodes in [3] support the Mobile IPv4 protocol and perform registration of their address at their home agent through a Foreign Agent.
  • the Foreign Agent changes in case the mobile nodes attach to a different network, as Foreign Agents are part of the network infrastructure and not mobile.
  • the aforementioned object is accomplished by a method comprising the features of claim 1 and by a system comprising the features of claim 25.
  • a method and an according system of networks for providing access of at least one client device via a mobile network to a network which is related to the client device, wherein said mobile network is provided by a mobile device, wherein said mobile device learns about the presence of the client device in the provided mobile network and informs a proxy function in the related network to proxy for the client device's network address, while the client device is connected to the mobile device, and wherein said proxy function allows for communication of the client device with the related network while the client device being connected to the mobile device without changing its network address, which has been assigned to the client device in the related network.
  • An important feature of the invention is the use of the same network address of the client device within its related network and within the mobile network. By using the same network address in the related network and in the mobile network an emulation of the related network within the mobile network is possible.
  • said mobile device is connected to the internet.
  • a communication between the client device and the related network can be performed via the internet.
  • said network address of the client device could be an IP address.
  • said proxy function enables bi-directional traffic between the related network and the client device, when it is connected to the mobile device.
  • the client device can be used via the mobile network without any drawback compared to a direct connection to the related network.
  • said proxy function performs proxy IP address resolution for the client device, which is connected to the mobile device. This feature is particularly important if said related network is a home network of a client device's user. - -
  • the home network uses dynamic DNS (Domain Name Service) to remain reachable so that the mobile device can always connect to the home network even when the IP address of the home network changes.
  • DNS Domain Name Service
  • said proxy function could be located within the home network or within the internet or within a mobile operator network. It is not necessary that the related network is a home network.
  • said mobile device could be a client of the related network.
  • the mobile device could be a client of the same home network as at least one of the connected client devices. This feature could ensure essentially seamless mobility for client devices in a very simple way.
  • said mobile device could be a cellular phone.
  • a cellular phone or mobile device could have Soft Access Point functionality.
  • the cellular phone or mobile device could offer a mobile wireless LAN to a client device.
  • the emerging technology of cellular phones being enriched with a WLAN chipset and to enable these phones to function as a WLAN access point enables new use cases. These phones can serve client WLAN devices as access point to build a mobile Personal Area Network (PAN), while the cellular phone is attached to the network infrastructure and the Internet via the subscriber's mobile operator.
  • PAN Personal Area Network
  • wireless home devices can now attach to such mobile device Soft Access Point to maintain connectivity to the Internet when a user is not at home.
  • the technical issue comprises continuity of service from home, such as the streaming server or home control center for home automation, as these components still assume that the client device is attached to the local home WLAN access point.
  • a new idea of using the WLAN functionality of cellular phones is to route traffic from a WLAN client to the internet, i.e. the WLAN chip on the cellular phone is used as - -
  • Soft-AP Soft Access Point
  • connection between the mobile device and the client device and/or between the client device and the related network is not limited to a WLAN connection. In both cases the connection can also be performed by a cable connection. This will provide a connection of the client device via the mobile device to the related network if the client device is remote from the related network.
  • the client device when the client device is connected to the mobile device and recognizes that the related network is - preferably directly - available, the client device could connect to the related network and will then receive the same network address as at the mobile device.
  • the client device when the client device is attached to the mobile device and recognizes that the related network is again available, the client device connects again to the related network, the client device will receive the same IP address as at the mobile device and therefore can just continue the communication with any device in the related network without any interruption.
  • the related network could be the home network of a user. The same applies vice versa in case the client device recognizes that the related network is not available anymore, but the client device may attach to the mobile device to remain connected while keeping the IP address it used in the related network.
  • the client device when the client device is primarily connected to the related network and recognizes that the related network is not available anymore, but the client device may attach to the mobile device, the client device could connect to the mobile device while keeping the network address it used in the related network.
  • the proxy function could be realized by a Forwarding Agent.
  • a Forwarding Agent could be part of the client device's related network.
  • the Forwarding Agent could be co- located with a router, home gateway or base station, preferably home base station or home Femtocell base station.
  • the proxy function or the Forwarding Agent could select and forward the packets for and/or from the client device which is connected to the mobile device or mobile network, while packets of other clients remain untouched.
  • the proxy function or the Forwarding Agent could selectively intercept packets and forward these packets to the emulated mobile related network or mobile home network.
  • the forwarding could preferably be based on IP tunnelling, GRE (Generic Routing Encapsulation), IPsec or UPD/IP tunnelling mechanisms.
  • GRE Generic Routing Encapsulation
  • IPsec IP Security
  • UPD/IP tunnelling mechanisms there could be realized a tunnel connection between the proxy function or the Forwarding Agent in the related network and the mobile device, which provides the mobile network to client devices, preferably via the internet.
  • bitmap or partial bitmap could represent the address suffix of clients being connected to the mobile device or mobile network and whose packets need to be forwarded by the proxy function or Forwarding Agent from the related network.
  • Said bitmap or partial bitmap could preferably be part of a registration message sent by the client device or the mobile device to the proxy function or Forwarding Agent.
  • the bitmap or partial bitmap could be transmitted during a preferred registration of the client device at the related network.
  • the bitmap or partial bitmap could be sent together with a network prefix or home network prefix.
  • the selection at the proxy function or Forwarding Agent could be performed by means of referring to each client's network address. Such a network address could be transmitted to the proxy function or Forwarding Agent during registration of the client device which is connected to the mobile device.
  • an entity in the home network - Forwarding Agent (FA) - and a component on the cellular phone co-ordinate the handover of a WLAN client from the home network to the WLAN Soft-AP on a cellular phone.
  • FA and cellular phone then build a tunnel to forward packets between the WLAN client and any other IP endpoint, e.g. a server in the home network.
  • the WLAN client does not change the IP address, it only uses standard technology to attach to the new WLAN AP, the Soft-AP.
  • the FA maintains a bitmap in order to distinguish between clients, who are "at home" and those which can be reached via the Soft-AP.
  • Alternative control of selection can be done by a list with the client's complete IP addresses.
  • a local home network on a mobile device for preferably wireless clients, which do not support mobility but attach to the mobile device while these clients keep their home IP address.
  • a controlled and selective forwarding of packets for/from these clients between the mobile device and a Forwarding Agent at home is possible, while packets of other clients are untouched.
  • the selection can be controlled according to a bitmap in the registration message, which applies to the home network address suffix space to identify clients which are not at home but attached to the mobile device.
  • An alternative control of selection can be performed by means of referring to each client's complete IP address.
  • the invention enables new use cases for soft AP mobile phones which can not be solved with state of the art mechanisms, as such mechanisms solve a different problem, e.g. mobile router technology.
  • Prior art requires for example a change of a client device's IP address when attaching to a mobile router with a different mobile network prefix. Thus, continuity of home service is not supported.
  • the invention requires no modification of wireless home devices such as mobility protocol support.
  • Prior art is not suitable for the proposed use case due to differences in the mobile router and mobile network characteristics.
  • Existing protocols for network mobility register a mobile prefix with a home agent and all packets addressing the mobile prefix will be forwarded to the mobile network without any individual selection of client devices. Selective forwarding for clients at home and clients on a mobile home network is not supported by prior art mechanisms.
  • Fig. 1 is illustrating a preferred embodiment of a method and a system of networks for providing an access of at least one client device via a mobile network to a network according to the invention
  • Fig. 2 is illustrating an exemplary message and forwarding diagram
  • Fig. 3 is illustrating a preferred embodiment of how to build a partial bitmap for selecting client devices which are attached to the mobile device
  • Fig. 4 is illustrating problems of prior art mechanisms with regard to a use case
  • Fig. 5 is illustrating further problems of prior art mechanisms with regard to a use case.
  • a preferred embodiment of the invention considers a Forwarding Agent in the user's home network. It's preferable to co-locate this Forwarding Agent for example with a - -
  • Fig. 1 depicts the enabled use case, where the Forwarding Agent is illustrated as separate component in the home local area network for the sake of clarity.
  • Client registration can be performed by means of a bitmap, which represents the address suffix of clients being attached to the emulated mobile home network and whose packets need to be forwarded by the forwarding agent.
  • a preferred prerequisite to enable the use case is the capability of the cellular phone to serve as WLAN access point to client devices and to route packets between this WLAN network and the Internet through the cellular operator's network.
  • the cellular phone once being attached to the packet data network of the cellular operator, receives an IP address, e.g. IP 10.2.14.124/16, from the cellular operator.
  • the cellular phone must configure the network prefix of the WLAN network, which builds the mobile Personal Area Network, according to the user's home local area network, e.g. 192.168.1.0/24.
  • the cellular phone must register attached home devices at the Forwarding Agent in the user's home. This can be done by including a masquerading bitmap, which identifies individual client addresses being attached to the cellular phone instead of to the home local network.
  • the cellular phone can - -
  • IP address of individual client devices being attached to the cellular phone's WLAN soft access point.
  • the Forwarding Agent at home intercepts and forwards only packets of registered client devices to the IP address of the cellular phone. The other packets remain untouched as they are supposed to address client devices being attached directly to the home local network. Forwarding can be based on IP tunneling, GRE, IPsec or UPD/IP tunneling mechanisms to preferably cope with NATs (Network Address Translation). On the reverse path, packets being sent by client devices being attached to the cellular phone are forwarded to the Forwarding Agent and then further to the packet's destination.
  • Fig. 1 is showing an enabled use case of an emulated and mobile home network with the help of a soft access point enabled mobile cellular phone with selective interception and forwarding at a Forwarding Agent.
  • the cellular phone implements a Soft WLAN Access Point.
  • Fig. 2 illustrates an exemplary message sequence in case the home device, such as a video display client, is attached to the home network when being at home or attached to the cellular or mobile phone when not being at home.
  • the server streams video data to the video client's local home address in the home network (192.168.1.3).
  • the video client attaches to the user's cellular phone, which is registered with the mobile operator and holds the IP address it received from the operator's packet network (10.2.13.124).
  • the cellular phone signals to the Forwarding Agent at home that it emulates the client's home network (192.168.1.0/24) and requests to forward packets from the home network to the cellular phone only for the client(s) being attached to the cellular phone.
  • Clients which are attached to the cellular phone, are identified by means of the partial bitmap, which applies to the home network suffix space.
  • the cellular phone could identify attached clients by means of including individual clients' complete IP address into the registration message.
  • the Forwarding Agent intercepts packets from the local home network only for the clients being attached to the cellular phone and forwards these packets to the cellular phone by means of packet encapsulation.
  • the cellular phone terminates the forwarding tunnel, decapsulates these packets and forwards the packet to the attached client(s).
  • return packets which are encapsulated at the cellular phone and decapsulated at the Forwarding Agent at home to be further forwarded in the home network. Packets for all other clients in the local home network, which are still at home, are untouched by the Forwarding Agent.
  • Fig. 3 is illustrating a preferred embodiment of how to build a partial bitmap to identify a set of "mobile home devices", which are attached to the cellular phone, in a complete home address suffix space.
  • Fig. 3 exemplarily depicts how a partial bitmap can be built and used to identify clients from a home network suffix address space, which are attached to the emulated mobile home network.
  • the partial bitmap can be sent together with the home network prefix in the registration to the Forwarding Agent. Starting point of the transmitted partial bitmap is the first Byte, which is not 0x00.
  • the partial bitmap is also delimited by the last Byte, which is not 0x00.
  • the protocol option which carries the partial bitmap, must refer to the offset value to allow unambiguous identification of the partial bitmap in the complete bitmap space.
  • Alternative mechanisms can be used to identify individual clients, which are attached to the mobile cellular phone, such as sending all attached clients' individual address with the registration.
  • the cellular phone When the cellular phone sets up the tunnel towards the home network, it has to find out the IP-address of the router.
  • the operator assigns a new address from time to time, e.g. on a daily basis.
  • the home router should use a dynamic DNS service, i.e. register always the fresh IP-address with the dynamic DNS server.
  • the cellular phone can always reconnect after a break. The home router could even warn the cellular phone before it pro-actively refreshes the DSL connection.
  • the client device When the client device is attached to the mobile device and detects again the availability of the home network or related network, it will attach to this network again. This depends on the exact implementation of this device and can therefore not be predicted exactly by the mobile device or the home network or related network.
  • the forwarding agent When the home network or related network recognizes that the client device is attached, the forwarding agent will stop forwarding packets and instead make sure that the packets are sent directly. This can be done by an unsolicited ARP (Address Resolution Protocol) request.
  • ARP Address Resolution Protocol

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un système des réseaux permettant d'offrir un accès à un réseau qui est raccordé à un dispositif client, d'au moins un dispositif client par l'intermédiaire d'un réseau mobile afin de permettre une mobilité sensiblement continue pour des dispositifs clients, ledit réseau mobile étant fourni par un dispositif mobile. Ledit dispositif mobile prend connaissance de la présence du dispositif client dans le réseau mobile fourni et informe une fonction de serveur proxy dans le réseau associé au serveur proxy de l'adresse réseau du dispositif client pendant que le dispositif client est raccordé au dispositif mobile. Ladite fonction de serveur proxy permet une communication du dispositif client avec le réseau associé pendant que le dispositif client est raccordé au dispositif mobile sans changer son adresse réseau qui a été attribuée au dispositif client dans le réseau associé.
PCT/EP2009/007900 2009-11-04 2009-11-04 Procédé et système des réseaux permettant d'offrir un accès à un réseau d'au moins un dispositif client par l'intermédiaire d'un réseau mobile Ceased WO2011054362A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/007900 WO2011054362A1 (fr) 2009-11-04 2009-11-04 Procédé et système des réseaux permettant d'offrir un accès à un réseau d'au moins un dispositif client par l'intermédiaire d'un réseau mobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/007900 WO2011054362A1 (fr) 2009-11-04 2009-11-04 Procédé et système des réseaux permettant d'offrir un accès à un réseau d'au moins un dispositif client par l'intermédiaire d'un réseau mobile

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WO2011054362A1 true WO2011054362A1 (fr) 2011-05-12

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Cited By (1)

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RU2643492C2 (ru) * 2013-12-20 2018-02-01 Хуавэй Текнолоджиз Ко., Лтд. Способ оптимизации маршрута, маршрутизатор и объект-администратор местоположений

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Publication number Priority date Publication date Assignee Title
RU2643492C2 (ru) * 2013-12-20 2018-02-01 Хуавэй Текнолоджиз Ко., Лтд. Способ оптимизации маршрута, маршрутизатор и объект-администратор местоположений

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