Hierarchical wireless network and an associated method for delivering IP packets to mobile stations

• US 20030202505A1
• Filed: 04/30/2002
• Published: 10/30/2003
• Est. Priority Date: 04/30/2002
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Ozugur, Timucin
• Granted Patent: US 7,289,463 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04L 61/59 using proxies for addressing
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A hierarchical wireless network is comprised of two levels, a first level configured for wired coupling to an IP network and comprised of a gateway configured for wired coupling to the IP network, a WiARP server and a data store; and a second level, wired to the first level by a distribution system, and comprised of at least two access points, each configured for wireless association with a respective plurality of mobile stations and having a WiARP proxy residing therein. For each mobile station associated with the second level, the WiARP server maintains an IP address of the mobile station and a MAC address for the access point with which the mobile station is associated. Conversely, each WiARP proxy maintains, on behalf of the associated access point, IP and MAC addresses for each mobile station associated therewith.

Claims

1. A hierarchical wireless network, comprising:

a first level, said first level configured for wired coupling to an IP network; and

a second level wired to said first level, said second level configured for wireless association with a plurality of mobile stations;

said first level maintaining, for each mobile station associated with said second level, a wireline address for said mobile station within said second level; and

said second level maintaining, for each mobile station associated with said second level, a wireless address for said mobile station.

2. The hierarchical wireless network of claim 1, wherein:

said second level is comprised of at least two access points configured for wireless association with a respective plurality of mobile stations; and

said first level maintaining, for each mobile station associated with said wireless level by one of said at least two access points, an address of said access point to which said mobile station is associated.

3. The hierarchical wireless network of claim 2, wherein each one of said at least two access points maintains a data store containing an IP address and a MAC address, linked to said IP address, for each mobile terminal associated with to said access point.

4. The hierarchical wireless network of claim 3, wherein said data store is a look-up table.

5. The hierarchical wireless network of claim 2, wherein each one of said at least two access points maintains a look-up table containing an entry for each mobile station associated therewith.

6. The hierarchical wireless network of claim 5, wherein each entry in said look-up table contains an IP address and a MAC address for a mobile terminal associated with said access point maintaining said look-up table.

7. The hierarchical wireless network of claim 2, wherein said first level further comprises a gateway configured for wired coupling to said IP network.

8. The hierarchical wireless network of claim 7, and further comprising a distribution system for coupling said gateway to said at least two access points, said distribution system wired to said gateway and said at least two access points.

9. The hierarchical wireless network of claim 8, wherein said gateway maintains, for each mobile station coupled to said second level, said MAC address of said access point with which said mobile station is associated.

10. The hierarchical wireless network of claim 8, and further comprising a WiARP server wired to said gateway, said WiARP server maintaining, for each mobile station associated with said second level, said MAC address of said access point with which said mobile station is associated.

11. The hierarchical wireless network of claim 10, wherein said WiARP server maintains a look-up table containing an entry for each mobile station associated with one of said at least one access points.

12. The hierarchical wireless network of claim 11, wherein each entry in said look-up table maintained in said WiARP server contains an IP address for a mobile terminal associated with one of said at least one access points and a MAC address for said access point with which said mobile terminal is associated.

13. The hierarchical wireless network of claim 10, wherein said WiARP server maintains a data store containing an IP address for each mobile terminal associated with one of said at least one access points and a MAC address, linked to said IP address, for said access point with which said mobile terminal is associated.

14. The hierarchical wireless network of claim 13, wherein said data store is a look-up table.

15. The hierarchical wireless network of claim 14, wherein each one of said at least two access points maintains a look-up table containing an entry for each mobile station associated therewith.

16. The hierarchical wireless network of claim 15, wherein each entry in said look-up table contains an IP address and a MAC address for a mobile terminal associated with said access point maintaining said look-up table.

17. The hierarchical wireless network of claim 14, wherein each one of said at least two access points maintains a look-up table containing an IP address and a MAC address, linked to said IP address, for a mobile terminal associated with said access point maintaining said look-up table.

18. The hierarchical wireless network of claim 7, and further comprising a WiARP server wired to said distribution system, said WiARP server maintaining, for each mobile station associated with said second level, said MAC address of said access point with which said mobile station is associated.

19. The hierarchical wireless network of claim 18, wherein said WiARP server maintains a data store containing an IP address for each mobile terminal associated with one of said at least one access points and a MAC address, linked to said IP address, for said access point with which said mobile terminal is associated.

20. For a wireless network comprised of at least two access points with which mobile stations may associate, a gateway to an IP network and a distribution system coupling said at least two access points to said gateway, a method for unicast delivery of IP data to mobile stations associated with one of said at least two access points, comprising:

linking an IP address for a mobile station to a MAC address for an access point with which said mobile station is associated;

said gateway forwarding an IP data packet bearing said IP address to said access point having said MAC address linked to said IP address; and

said access point delivering said forwarded IP data packet to said mobile station having said IP address.

21. The method of claim 20, wherein said access point delivering said forwarded IP data packet to said mobile station having said IP address further comprises:

linking said IP address for said mobile station to a MAC address for said mobile station; and

said access point delivering said forwarded IP data packet bearing said IP address to said mobile station having said MAC address linked to said IP address.

22. The method of claim 20, and further comprising maintaining a first data store at said gateway, said first data store comprised of IP addresses for each mobile station associated with one of said at least two access points of said wireless network and MAC addresses for each one of said at least two access points.

23. The method of claim 22, wherein each said IP address of a mobile station maintained in said first data store is linked to said MAC address for said access point with which said mobile station is associated.

24. The method of claim 23, and further comprising:

receiving, at said gateway, an IP data packet from said IP network;

determining an IP address of said received IP data packet;

determining if said first data store includes an IP address matching said determined IP address; and

if said first data store includes an IP address matching said determined IP address, forwarding said received IP data packet to said access point having said MAC address linked to said matching IP address.

25. The method of claim 24, and further comprising maintaining a second data store at each one of said at least two access points, said second data store at each one of said at least two access points comprised of IP and MAC addresses for each mobile station associated with that access point.

26. The method of claim 25, and further comprising:

if said first data store does not have an IP address matching said determined IP address, broadcasting said determined IP address to each one of said at least two access points of said wireless network;

if said second data store of one of said at least two access points includes an IP address matching said determined IP address, said access point having said second data store which includes said matching IP address transmitting its MAC address to said gateway; and

said gateway forwarding said received IP data packet bearing said IP address to said access point which transmitted its MAC address thereto.

27. The method of claim 26, and further comprising, prior to forwarding said received IP data packet, linking said determined IP address to said MAC address transmitted thereto.

28. The method of claim 27, and further comprising said gateway discarding said received IP data packet if none of said at least two access points transmits its MAC address to said gateway in response to said broadcast of said determined IP address.

29. The method of claim 24, wherein said access point delivering said forwarded IP data packets to said mobile station having said IP address further comprises:

linking said IP address for said mobile station to a MAC address for said mobile station; and

said access point delivering said forwarded IP data packet to said mobile station having said MAC address linked to said IP address.

30. The method of claim 29, and further comprising maintaining a second data store at each one of said at least two access points, said second data store at each one of said at least two access points comprised of IP and MAC addresses for each mobile station associated with that access point.

31. The method of claim 30, wherein said IP and MAC addresses for each mobile station maintained in said second data store are linked to one another.

32. The method of claim 31, and further comprising:

determining, at said access point receiving said IP packet, said IP address of said received IP data packet;

determining if said second data store includes an IP address matching said determined IP address; and

if said second data store includes an IP address matching said determined IP address, forwarding said received IP data packet to said mobile station having said MAC address linked to said matching IP address.

33. The method of claim 32, and further comprising:

if said second data store does not have an IP address matching said IP address of said received IP data packet, said access point broadcasting said IP address of said received IP data packet to the other access points of said wireless network;

if said second data store of an other access point of said wireless network includes an IP address matching said IP address broadcast by said access point, said other access point notifying said broadcasting access point of said matching IP address;

said broadcasting access point forwarding said received IP data packet to said other access point; and

said other access point delivering said forwarded IP data packet to a mobile station having a MAC address linked to said matching IP address.

34. The method of claim 33, and further comprising said broadcasting access point providing said gateway with an updated MAC address for linking with said IP address, said updated MAC address being said MAC address for said other access point.