Wide-area wireless lan access

• US 5,796,727 A
• Filed: 04/30/1993
• Issued: 08/18/1998
• Est. Priority Date: 04/30/1993
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Jaepel, Dieter, Harrison, Colin George
• Primary Examiner(s): Safourek, Benedict V.
• Application Number:
  US08/056,285
• Time in Patent Office: 1,936 Days
• Field of Search: 379/58, 379/59, 379/60, 379/63, 379/165, 379/220, 455/33.1, 455/33.2, 455/53.1, 455/54.1, 455/56.1, 455/422, 455/426, 455/436, 455/445, 455/507, 455/517, 455/518, 455/520, 455/557, 370/85.1, 370/85.13, 370/94.1, 370/94.3, 370/328, 370/329, 370/336, 370/338, 370/349, 370/400, 370/401, 370/406, 370/911, 370/913
• US Class Current: 370/338
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y10S 370/913 Wireless or radio

Abstract

A method and apparatus is provided which permits mobile computers equipped with modems for cellular telephone systems to obtain various classes of data communication services, as well as voice service, including taking part in local-area networks. The LAN'"'"'s may be composed of conventional LANS in establishments or of other mobile computers. In this way, mobile computers can take part in mainstream client-server computing and also establish wireless LANs using the cellular telephone system.

Claims

1. A method of transmitting data via a cellular telephone communication system comprising the steps of:

a. transmitting fragments of a LAN MAC frame over a wireless link from a source computer to a Cell Controller, CC, the source computer being equipped with a cellular wireless modem for use in the wireless link;

b. transporting fragments of the LAN MAC frame from the CC to a Mobile Telephone Service Office, MTSO;

c. routing the fragments of the LAN MAC frame through the MTSO to a Mobile Data Service Controller MDSC; and

d. re-assembling the LAN MAC frame from successive fragments received at the MDSC.

2. The method as set forth in claim 1, and further including after step d, the steps of:

a. recognizing from a destination MAC address in the re-assembled LAN MAC frame that a destination computer is another computer equipped with a cellular wireless modem in the same cell or another cell controlled by the same MTSO; and

b. relaying the re-assembled LAN MAC frame to the destination computer.

3. The method as set forth in claim 2, wherein a second computer equipped with a wireless modem establishes and takes part in LAN communication via the cellular telephone system with another computer equipped with a wireless modem in the same cell or another cell controlled by the same MTSO.

4. The method as set forth in claim 1, and further including after step d, the steps of:

a. recognizing from a destination MAC address in the re-assembled LAN MAC frame that a destination computer is not another computer equipped with a cellular wireless modem in the same cell or another cell controlled by the same MTSO; and

b. relaying the re-assembled LAN MAC frame to a wide-area network interface module.

5. The method as set forth in claim 4, wherein the wide-area network interface module is a gateway into a packet-switched wide-area network including the step of:

a. routing the LAN MAC frame through the wide-area network to a gateway into a Local Area Network, LAN, containing the destination computer.

6. The method as set forth in claim 5, including the step of:

merging into a common stream through said wide-area network, said LAN MAC frame and another MAC frame having destination MAC addresses on a common remote LAN.

7. The method as set forth in claim 4, wherein the wide-area network interface module is a half-bridge interfaced to a connection-oriented wide-area network including the steps of:

a. using one of an address and an identifier previously provided by the source computer to establish a connection through the wide-area network to a similar half-bridge which is attached to a Local Area Network, LAN, containing the destination computer.

8. The method as set forth in claim 7, including the steps of:

a. routing the LAN MAC frame through the wide-area network to the half-bridge attached to the LAN containing the destination computer; and

b. merging into a common stream through said wide-area network, said LAN MAC frame and another MAC frame having destination MAC addresses on a common remote LAN.

9. The method as set forth in claim 7, wherein a second computer equipped with a wireless modem establishes and takes part in LAN communication via the cellular telephone system with another computer which is attached to a remote LAN.

10. The method as set forth in claim 4, wherein the wide-area network interface module is a half-bridge interfaced to a connection-oriented data network, including the step of:

a. using one of an address and an identifier previously provided by the source computer to establish a connection to a similar half-bridge which is attached to another MDSC which communicates with the destination computer via another cellular telephone MTSO and CC.

11. The method as set forth in claim 10, wherein a second computer equipped with a wireless modem establishes and takes part in LAN communication via the cellular telephone system with another computer equipped with a wireless modem in the same cell or another cell controlled by another MTSO.

12. The method as set forth in claim 1, and further including after step d. the steps of:

a. recognizing from a destination MAC address in the re-assembled LAN MAC frame that a destination computer is not another computer equipped with a cellular wireless modem in the same cell or another cell controlled by the same MTSO; and

b. relaying the re-assembled LAN MAC frame to a Shadow PC in the MDSC.

13. The method as set forth in claim 12, wherein the Shadow PC provides support for a source computer which is equipped with a wireless modem and which is taking part in LAN communication via the cellular telephone system with at least one other computer which is attached to a remote LAN.

14. The method as set forth in claim 12, wherein the Shadow PC provides a service to a source computer which is equipped with a wireless modem and which is taking part in LAN communication via the cellular telephone system with at least the Shadow PC.

15. The method according to claim 1, wherein another computer equipped with a cellular wireless modem informs the MDSC at the time of registration of the association between LAN MAC addresses it expects to employ and an identifier which is an address or identifying number of half-bridges between connection-oriented data networks and the LANs containing these LAN MAC addresses.

16. The method as set forth in claim 15, wherein the identifier identifies one or more LAN addresses as belonging to computers equipped with cellular wireless modems.

17. The method as set forth in claim 16, wherein the identifier is a network address.

18. The method as set forth in claim 16, wherein the identifier is a telephone number.

19. The method as set forth in claim 15, wherein the identifier is a network address.

20. The method as set forth in claim 15, wherein the identifier is a telephone number.

21. A method of transmitting data via a cellular telephone communication system comprising the steps of:

a. receiving a LAN MAC frame at a Mobile Data Service Controller, MDSC;

b. dividing the LAN MAC frame into fragments;

c. routing the fragments of the LAN MAC frame through a Mobile Telephone Service Office, MTSO;

d. transporting the fragments of the LAN MAC frame from the MTSO to a Cell Controller, CC; and

e. transmitting the fragments of the LAN MAC frame over a wireless link from the CC to a computer, the computer being equipped with a cellular wireless modem for use in the wireless link.

22. A method of Local Area Network, LAN, communications between a first computer and at least one other computer comprising the steps of:

a. initially establishing and taking part in LAN communication by a first computer with at least one other computer via either a wired connection between the first computer and a LAN or a local non-cellular wireless connection between the first computer and the LAN;

b. using a cellular wireless modem attached to the first computer to establish a cellular LAN connection between the first computer and one or more of the same other computers for cellular communication;

c. dropping the initial LAN communication via the wired or local non-cellular wireless connection with the first computer; and

d. maintaining the cellular LAN communication.

23. The method as set forth in claim 22, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in the same cell as said first computer or another cell controlled by the same Mobile Telephone Service Office (MTSO) as said first computer.

24. The method as set forth in claim 22, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in another cell controlled by a different Mobile Telephone Service Office MTSO as said first computer.

25. The method as set forth in claim 22, wherein said at least one other computer is attached to a remote LAN.

26. A method of Local Area Network, LAN, communications between a first computer and at least one other computer comprising the steps of:

a. initially using a cellular wireless modem attached to a first computer to establish a cellular LAN connection between the first computer and a LAN for establishing and taking part in LAN communication with at least one other computer;

b. establishing LAN communication between the first computer and one or more of the same other computers via either a wired connection between the first computer and the LAN or a local non-cellular wireless connection between the first computer and the LAN;

c. dropping the initial cellular LAN connection; and

d. maintaining the LAN communication via the wired or local wireless connection.

27. The method as set forth in claim 26, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in the same cell as said first computer or another cell controlled by the same Mobile Telephone Service Office (MTSO) as said first computer.

28. The method as set forth in claim 26, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in another cell controlled by a different Mobile Telephone Service Office (MTSO) as said first computer.

29. The method as set forth in claim 26, wherein said at least one other computer is attached to a remote LAN.

30. Apparatus for transmitting data via a cellular telephone communication system, comprising:

a. means for transmitting fragments of a LAN MAC frame over a wireless link from a source computer to a Cell Controller, CC, the source computer being equipped with a cellular wireless modem for use in the wireless link;

b. means for transporting fragments of the LAN MAC frame from the CC to a Mobile Telephone Service Office, MTSO;

c. means for routing the fragments of the LAN MAC frame through the MTSO to a Mobile Data Service Controller, MDSC; and

d. means for re-assembling the LAN MAC frame from successive fragments received at the MDSC.

31. The apparatus as set forth in claim 30, including:

a. means for recognizing from a destination MAC address in the re-assembled LAN MAC frame that a destination computer is another computer equipped with a cellular wireless modem in the same cell or another cell controlled by the same MTSO; and

b. means for relaying the re-assembled LAN MAC frame to the destination computer.

32. The apparatus as set forth in claim 31, wherein a second computer equipped with a wireless modem establishes and takes part in LAN communication via the cellular telephone system with another computer equipped with a wireless modem in the same cell or another cell controlled by the same MTSO.

33. The apparatus as set forth in claim 30, including:

a. means for recognizing from a destination MAC address in the re-assembled LAN MAC frame that a destination computer is not another computer equipped with a cellular wireless modem in the same cell or another cell controlled by the same MTSO; and

b. means for relaying the re-assembled LAN MAC frame to a wide-area network interface module.

34. The apparatus as set forth in claim 33, wherein the wide-area network interface module is a gateway into a packet-switched wide-area network, including:

a. means for routing the LAN MAC frame through the wide-area network to a gateway into a Local Area Network, LAN, containing the destination computer.

35. The apparatus as set forth in claim 34, including:

means for merging into a common stream through said wide-area network, said LAN MAC frame and another MAC frame having destination MAC addresses on a same remote LAN.

36. The apparatus as set forth in claim 33, wherein the wide-area network interface module is a half-bridge interfaced to a connection-oriented wide-area network, including:

a. means for using one of an address and an identifier previously provided by the source computer to establish a connection through the wide-area network to a similar half-bridge which is attached to a Local Area Network, LAN, containing the destination computer.

37. The apparatus as set forth in claim 36, wherein a second computer equipped with a wireless modem establishes and takes part in LAN communication via the cellular telephone system with another computer which is attached to a remote LAN.

38. The apparatus as set forth in claim 36, including:

a. means for routing the LAN MAC frame through the wide-area network to the half-bridge attached to the LAN containing the destination computer; and

b. means for merging into a common stream through said wide-area network, said LAN MAC frame and another MAC frame having destination MAC addresses on a common remote LAN.

39. The apparatus according to claim 30, wherein another computer equipped with a cellular wireless modem informs the MDSC at the time of registration of the association between LAN MAC addresses it expects to employ and an identifier which is an address or identifying number of half-bridges between connection-oriented data networks and the LANs containing these LAN MAC addresses.

40. The apparatus as set forth in claim 39, wherein the identifier identifies one or more LAN addresses as belonging to computers equipped with cellular wireless modems.

41. The apparatus as set forth in claim 40, wherein the identifier is a network address.

42. The apparatus as set forth in claim 40, wherein the identifier is a telephone number.

43. The apparatus as set forth in claim 39, wherein the identifier is a network address.

44. The apparatus as set forth in claim 39, wherein the identifier is a telephone number.

45. The apparatus as set forth in claim 33, wherein the wide-area network interface module is a half-bridge interfaced to a connection-oriented data network, including:

a. means for using one of an address and an identifier previously provided by the source computer to establish a connection to a similar half-bridge which is attached to another MDSC which communicates with the destination computer via another cellular telephone MTSO and CC.

46. The apparatus as set forth in claim 45, wherein a second computer equipped with a wireless modem establishes and takes part in LAN communication via the cellular telephone system with another computer equipped with a wireless modem in the same cell or another cell controlled by another MTSO.

47. The apparatus as set forth in claim 30, including:

a. means for recognizing from a destination MAC address in the re-assembled LAN MAC frame that a destination computer is not another computer equipped with a cellular wireless modem in the same cell or another cell controlled by the same MTSO; and

b. means for relaying the re-assembled LAN MAC frame to a Shadow PC in the MDSC.

48. The apparatus as set forth in claim 47, wherein the Shadow PC provides support for a source computer which is equipped with a wireless modem and which is taking part in LAN communication via the cellular telephone system with at least one other computer which is attached to a remote LAN.

49. The apparatus as set forth in claim 47, wherein the Shadow PC provides a service to a source computer which is equipped with a wireless modem and which is taking part in LAN communication via the cellular telephone system with at least the Shadow PC.

50. Apparatus for transmitting data via a cellular telephone communication system, comprising:

a. means for receiving a LAN MAC frame at a Mobile Data Service Controller, MDSC;

b. means for dividing the LAN MAC frame into fragments;

c. means for routing the fragments of the LAN MAC frame through a Mobile Telephone Service Office, MSTO;

d. means for transporting the fragments of the LAN MAC frame from the MTSO to a Cell Controller, CC; and

e. means for transmitting the fragments of the LAN MAC frame over a wireless link from the CC to a computer, the computer being equipped with a cellular wireless modem for use in the wireless link.

51. A system of Local Area Network, LAN, communications between a first computer and at least one other computer, comprising:

a. means for initially establishing and taking part in LAN communication by a first computer with at least one other computer via either a wired connection between the first computer and a LAN or a local non-cellular wireless connection between the first computer and the LAN;

b. means for using a cellular wireless modem attached to the first computer to establish a cellular LAN connection between the first computer and one or more of the same other computers for cellular communication;

c. means for dropping the initial LAN communication via the wired or local non-cellular wireless connection with the first computer; and

d. means for maintaining the cellular LAN communication.

52. The system as set forth in claim 51, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in the same cell as said first computer or another cell controlled by the same Mobile Telephone Service Office (MTSO) as said first computer.

53. The system as set forth in claim 51, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in another cell controlled by a different Mobile Telephone Service Office (MTSO) as said first computer.

54. The system as set forth in claim 51, wherein said at least one other computer is attached to a remote LAN.

55. A system of Local Area Network, LAN, communications between a first computer and at least one other computer, comprising:

a. means for initially using a cellular wireless modem attached to a first computer to establish a cellular LAN connection between the first computer and a LAN for establishing and taking part in LAN communication with at least one other computer;

b. means for establishing LAN communication between the first computer and one or more of the same other computers via either a wired connection between the first computer and the LAN or a local non-cellular wireless connection between the first computer and the LAN;

c. means for dropping the initial cellular LAN connection; and

d. means for maintaining the LAN communication via the wired or local wireless connection.

56. The system as set forth in claim 55, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in the same cell as said first computer or another cell controlled by the same Mobile Telephone Service Office (MTSO) as said first computer.

57. The system as set forth in claim 55, wherein said at least one other computer is equipped with a wireless modem for taking part in LAN communications with said first computer and is located in another cell controlled by a different Mobile Telephone Service Office (MTSO) as said first computer.

58. The system as set forth in claim 55, wherein said at least one other computer is attach ed to a remote LAN.