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1. WO2011045405 - ROUTAGE DE LIAISON DESCENDANTE DE PAQUETS IP DANS UN I-WLAN PAR L'INTERMÉDIAIRE DE MULTIPLES PDG

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CLAIMS

1. Data packet routing method for transmitting a data packet (p) from a server (HA) to an user equipment (UE), wherein the data packet (p) is transmitted (150) through a forwarding data packet gateway (PDGi) selected among a plurality of packet data gateways (PDG1 , PDG2), characterised in that the forwarding data packet gateway (PDGi) is selected (140) in accordance with flow-level routing information stored in the server (HA) and IP flow identifying data (FIDi) recovered (130) from the content of said data packet (p).

2. Data packet routing method according to claim 1 , characterised in that the flow-level routing information is stored in the server (HA) during an IP flow registration step (110) initiated by the user equipment (UE).

3. Data packet routing method according to claim 2, characterised in that the IP flow registration step (110) comprises, for each one of a plurality of IP flows to be registered in the server (HA), the transmission (211 , 311 ) from the user equipment (UE) to the server (HA) of a respective binding update message (BU1 , BU2) which comprises said flow-level routing information.

4. Data packet routing method according to any one of claims 1 to 3, wherein the flow-level routing information comprises IP flow identifying data (FID1 , FID2) associated with packet data gateway identifying data (PDGJP1 , PDGJP2) for each IP flow, the method being characterised in that the forwarding data packet gateway (PDGi) is selected (240) in accordance with the packet data gateway identifying data (PDGJPi) matching the IP flow identifying data (FIDi) recovered from the data packet (p) content.

5. Data packet routing method according to claim 4, wherein a DSMIPv6 protocol is used by the user equipment (UE) and the server (HA), characterised in that the packet data gateway identifying data (PDGJPi) is included into the flow description field of the respective binding update message (BU1 ,BU2) according to a DSMIPv6 extension.

6. Data packet routing method according to any one of claims 1 to 3, wherein the flow-level routing information comprises IP flow identifying data (FID1 , FID2) associated with Care-of Address data (CoA1 , CoA2) for each IP flow, the method being characterised in that the server (HA) selects (340) the forwarding data packet gateway (PDGi) in accordance with the Care-of Address data (CoAi) matching the IP flow identifying data (FIDi) recovered from the data packet (p) content.

7. Data packet routing method according to claim 6, wherein each packet data gateway (PDGi) among the plurality of packet data gateways (PDG1 , PDG2) is associated to at least one remote IP address, the method being characterised in that the selected forwarding data packet gateway (PDGi) is the data packet gateway associated with an IP address matching (343) the Care-of Address data (CoAi) corresponding (341 ) to the IP flow identifying ata (FIDi) recovered (330) from the data packet (p) content.

8. Data packet routing method according to claim 7, characterised in that the Care-of Address data (CoAi) is assigned by a packet data gateway selected by the user equipment during l-WLAN service access with W-APN.

9. Data packet routing method according to any one of claims 1 to 8, characterised in that the IP flow identifying data (FIDi) is recovered (130) by filtering at least one specific parameter contained in said data packet (P).

10. Data packet routing method according to claim 9, wherein said data packet (p) comprises a source IP address and/or subnet mask, a destination IP address and/or subnet mask, a source port, a destination port and a protocol number, the method being characterized in that the IP flow identifying data (FIDi) is recovered (130) by filtering at least said source IP address and/or subnet mask, destination IP and/or subnet mask, source port, destination port and protocol number.

1 1 . Network server (HA) for forwarding a downlink data packet (p) to a forwarding packet data gateway (PDGi), the network server being characterised in that it comprises memorising means for storing flow-level routing information received from a user equipment (UE), flow identifying means for recovering IP flow identifying data (FIDi) from the content of said downlink data packet (p) and selecting means for selecting the forwarding packet data gateway (PDGi) among a plurality of forwarding packet data gateways (PDG1 , PDG2), the network server (HA) being adapted to carry out the steps of a data packet routing method according to any one of claims 1 to 8.

12. Network system comprising a network server (HA) according to claim

1 1 , a plurality of packet data gateways connected to said network server and at least one user equipment (UE) communicating with at least two active packet data gateways (PDG1 , PDG2) among said plurality of packet data gateways, wherein the user equipment (UE) is able to transmit flow-level routing information to the network server (HA) through said one of the at least two active packet data gateways (PDG1 , PDG2) and to receive a downlink data packet (p) from the network server (HA) via said one of the at least two active packet data gateways (PDG1 , PDG2) selected by the network server (HA).

13. Computer program product for implementing the data packet routing method according to any of the claims 1 to 10, when loaded and run on computer means of a network element.