Network address translation based internet protocol mobility

• US 6,845,094 B1
• Filed: 12/15/2000
• Issued: 01/18/2005
• Est. Priority Date: 12/16/1999
• Status: Expired due to Term

• Current Assignee: Tamiras Per Pte Ltd LLC (Intellectual Ventures LLC)
• Original Assignee: UTStarcom Incorporated (UTStarcom Holdings Corp.)
• Inventors: Zhang, Greg
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US09/739,055
• Time in Patent Office: 1,495 Days
• Field of Search: 370/331, 370/349, 370/352, 370/354, 370/389, 370/401
• US Class Current: 370/349
• CPC Class Codes: H04L 61/25 of the same type
• CPC Class Codes: H04L 61/5061 Pools of addresses
• CPC Class Codes: H04L 67/00 Network arrangements or protocols for supporting network services or applications user-to-user messaging H04L51/00; network arrangements, protocols or services for supporting real-time applications in data packet communications networks H04L65/00
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04W 8/082 for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]
• CPC Class Codes: H04W 92/20 between access points

Abstract

In an end to end fully internet protocol (IP) enabled network, a dynamic IP address space is used to address mobile hosts in order to facilitate mobility management. The network includes a wireless mobile network having a plurality of base stations each being associated with a portion of the dynamic IP address space. The base stations are operative to allocate dynamic IP addresses from the associated portion of the dynamic IP address space for each authenticated mobile host. Each of the base stations provides translation between the dynamic IP address space and a permanent IP address space so that the dynamic IP address space is transparent from the point of view of the mobile hosts. A gateway provides communicative coupling between the backbone of the wireless mobile network and a wire lined IP network. The gateway also provides translation between the dynamic IP address space and the permanent IP address space.

Claims

1. A fully end to end IP enabled wireless mobile network wherein each of a plurality of mobile hosts has an associated permanent IP address, and wherein a dynamic IP address space is used to address the mobile hosts in order to facilitate mobility management, comprising:

a plurality of base stations communicatively coupled with each other via a back bone, each of said base stations having an associated coverage area, and being associated with a portion of the dynamic IP address space, and also being capable of wireless communication with associated local mobile hosts located within said associated coverage area, and being operative to allocate dynamic IP addresses from said associated portion of said dynamic IP address space for corresponding ones of said associated local mobile hosts, and

each of said base stations is further operative to receive first packets via said back bone, each of said first packets carrying a dynamic IP address of an associated destination one of said associated local mobile hosts, each of said base stations being operative to translate said dynamic IP addresses carried by said first packets to the permanent IP addresses of said associated destination mobile hosts.

2. A fully end to end IP enabled wireless mobile network as recited in claim 1 wherein each of said base stations is further operative to receive second packets from said associated local mobile hosts via wireless links, each of said second packets carrying a destination permanent IP address of an associated destination one of the mobile hosts, each of said base stations being further operative to translate said destination permanent IP addresses carried by said second packets to current dynamic IP addresses of said associated destination mobile hosts.

3. A fully end to end IP enabled wireless mobile network as recited in claim 2 further comprising a gateway for communicatively coupling said backbone of said wireless mobile network with a wire lined IP network, said gateway for receiving third packets via the wire lined IP network, each of said third packets carrying a permanent IP address of an associated destination one of the mobile hosts, said gateway being operative to translate said permanent IP addresses carried by said third packets to current dynamic IP addresses of said associated destination mobile hosts.

4. A fully end to end IP enabled wireless mobile network as recited in claim 2 wherein each of said base stations is operative to translate between permanent IP addresses and dynamic IP addresses by accessing a distributed cache storing mapping information.

5. A fully end to end IP enabled wireless mobile network as recited in claim 2 wherein each of said base stations is further operative to store associated mapping information including said permanent IP addresses and said dynamic IP addresses associated with each said local mobile host located within said associated coverage area.

6. A fully end to end IP enabled wireless mobile network as recited in claim 3 wherein said gateway is operative to store mapping information including said permanent IP addresses and said dynamic IP addresses associated with each of said mobile hosts located within said wireless mobile network.

7. A fully end to end IP enabled wireless mobile network as recited in claim 5 wherein each of said base stations is further operative to transmit said associated mapping information to each other one of said base stations and to said gateway via said backbone in accordance with a distributed cache protocol.

8. A fully end to end IP enabled wireless mobile network as recited in claim 7 wherein said gateway is responsive to said mapping information transmitted by each of said base stations, and operative to store said mapping information.

9. A fully end to end IP enabled wireless mobile network as recited in claim 3 wherein said gateway is operative to advertise said permanent IP addresses of each of said mobile hosts to nodes of the wire lined IP network as prefixes served by said gateway.

10. A fully end to end IP enabled wireless mobile network comprising a plurality of base stations coupled together via a backbone, each of said base stations having an associated coverage area and being operative to communicate with a plurality of mobile hosts located within said associated coverage area, each of said mobile hosts having an associated permanent IP address, each of said base stations also being operative to allocate a dynamic IP address for each of said mobile hosts located within said associated coverage area;

wherein the dynamic IP addresses are allocated from a dynamic IP address space, and wherein each of said base stations is associated with a portion of said dynamic IP address space, each of said base stations being operative to allocate said dynamic IP addresses from said associated portion of said dynamic IP address space; and

,

wherein each of said base stations is further operative to receive first packets via said back bone, each of said first packets carrying a dynamic IP address of an associated destination one of said associated local mobile hosts, each of said base stations being operative to translate said dynamic IP addresses carried by said first packets to the permanent IP addresses of said associated destination mobile hosts.

11. A fully end to end IP enabled wireless mobile network as recited in claim 10 wherein each of said base stations is further operative to receive second packets from said associated local mobile hosts via wireless links, each of said second packets carrying a destination permanent IP address of an associated destination one of the mobile hosts, each of said base stations being further operative to translate said destination permanent IP addresses carried by said second packets to current dynamic IP addresses of said associated destination mobile hosts.

12. A fully end to end IP enabled wireless mobile network as recited in claim 11 further comprising a gateway for communicatively coupling said backbone of said wireless mobile network with a wire lined IP network, said gateway for receiving third packets via the wire lined IP network, each of said third packets carrying a permanent IP address of an associated destination one of the mobile hosts, said gateway being operative to translate said permanent IP addresses carried by said third packets to current dynamic IP addresses of said associated destination mobile hosts.

13. A fully end to end IP enabled network wherein each of a plurality of mobile hosts has an associated permanent IP address, and wherein a dynamic IP address space is used to address the mobile hosts in order to facilitate mobility management, comprising:

a wireless mobile network including a plurality of base stations communicatively coupled with each other via a back bone of said mobile network, each of said base stations having an associated coverage area, and being associated with a portion of the dynamic IP address space, and also being capable of wireless communication with associated local mobile hosts located within said associated coverage area, and being operative to allocate dynamic IP addresses from said associated portion of said dynamic IP address space for selected ones of said associated local mobile hosts, each of said base stations being further operative to receive first packets via said back bone, each of said first packets including a destination IP address field carrying a dynamic IP address of an associated destination one of said associated local mobile hosts, each of said base stations being operative to translate said dynamic IP addresses of said associated destination mobile hosts to the permanent IP addresses of said associated destination mobile hosts, each of said base stations being further operative to receive second packets from mobile hosts via wireless links, each of said second packets including a destination IP address field carrying a destination permanent IP address of an associated destination one of the mobile hosts, each of said base stations being further operative to translate said destination permanent IP addresses of said destination mobile hosts to current dynamic IP addresses of said associated destination mobile hosts; and

a gateway for communicatively coupling said backbone of said wireless mobile network with a wire lined IP network, said gateway for receiving third packets via the wire lined IP network, each of said third packets including a destination IP address field carrying a permanent IP address of an associated destination one of the mobile hosts, said gateway being operative to translate said permanent IP addresses of said associated destination mobile hosts to current dynamic IP addresses of said associated destination mobile hosts.

14. A fully end to end IP enabled network as recited in claim 13 wherein said selected associated local mobile hosts are determined by an authentication procedure.

15. A fully end to end IP enabled network as recited in claim 14 wherein each of said base stations is further operative to store associated mapping information including said permanent IP addresses and said dynamic IP addresses associated with each of said mobile hosts located within said associated coverage area.

16. A fully end to end IP enabled network as recited in claim 15 wherein each of said base stations is further operative to transmit said associated mapping information to each other one of said base stations and to said gateway via said backbone in accordance with a distributed cache protocol.

17. A fully end to end IP enabled network as recited in claim 16 wherein said gateway is responsive to said mapping information transmitted by each of said base stations, and wherein said gateway is operative to store said mapping information.

18. A fully end to end IP enabled network as recited in claim 13 wherein:

a target one of said local mobile hosts is initially located in a first coverage area associated with a first one of said base stations;

said first base station stores first mapping information indicating a mapping between a permanent IP address of said target host and a first dynamic IP address of said target host;

said target host moves from said first coverage area to a second coverage area associated with said second base station;

said first and second base stations are operative to exchange messages upon a handoff that occurs when said target host moves from said first coverage area to said second coverage area;

said second base station is operative to create and store second mapping information indicating a mapping between said permanent IP address of said target host and a second dynamic IP address of said target host;

said second base station is operative to pass said second mapping information to said first base station;

said first base station is operative to reserve said first dynamic IP address for a period of time;

said first base station is responsive to a packet destined for said target host and carrying said first dynamic IP address, and operative to translate said first dynamic IP address to said second dynamic IP address, and to forward said packet to said second base station.

19. A fully end to end IP enabled network as recited in claim 13 wherein said network is a heterogeneous network further including at least one stationary wire lined host.

20. A fully end to end IP enabled network as recited in claim 13 wherein said dynamic IP address space overlaps at least a portion of an address space comprising the permanent IP addresses.

21. A fully end to end IP enabled network as recited in claim 13 wherein said dynamic IP address space is a separate reserved address space having no overlap with an address space comprising the permanent IP addresses.