Protocol conversion and bandwidth reduction technique providing multiple nB+D ISDN basic rate interface links over a wireless code division multiple access communication system

• US 6,151,332 A
• Filed: 12/17/1997
• Issued: 11/21/2000
• Est. Priority Date: 06/20/1997
• Status: Expired

• Current Assignee: Intel Corporation
• Original Assignee: Tantivy Communications Incorporated (InterDigital, Inc.)
• Inventors: Amalfitano, Carlo, Gorsuch, Thomas E.
• Primary Examiner(s): Vu, Huy D.
• Assistant Examiner(s): BOAKYE, ALEXANDER O
• Application Number:
  US08/992,759
• Time in Patent Office: 1,070 Days
• Field of Search: 370/465, 370/466, 370/468, 370/469, 370/335, 370/342, 370/522, 370/524, 370/249, 375/200
• US Class Current: 370/466
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04L 1/165 Variable formats
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13202 Network termination [NT]
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/1327 Release and resetting of connection
• CPC Class Codes: H04Q 2213/13298 Local loop systems, access network
• CPC Class Codes: H04Q 2213/13332 Broadband, CATV, dynamic bandwidth allocation
• CPC Class Codes: H04Q 2213/1336 Synchronisation
• CPC Class Codes: H04Q 2213/13389 LAN, internet
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

A technique for integrating services digital network (ISDN) and code division multiple access (CDMA) or other digital wireless communication protocols by a technique that strips off lower protocol layers, such as layers one and two of the ISDN protocol and sending only layer three and above messages over a more efficient wireless protocol.

Claims

1. For use with a digital communication network having a first digital communication path for coupling Integrated Services Digital Network (ISDN) communication signals with a first wireless transceiver at a first site, said first wireless transceiver being operative to conduct wireless communications with a second wireless transceiver at a second site, a method of controlling bandwidth utilization of said network comprising the steps of:

(a) in response to establishment of a communication session between said first and second sites, controlling said first wireless transceiver to appear to said first digital communication path as though the bandwidth is continuously available during said communication session for wireless communications between said first and second transceivers, irrespective of the need to transport ISDN communication signals between said first and second sites; and

(b) in the absence of said need to transport ISDN communication signals between said first and second sites, making said bandwidth available for wireless communication by another wireless transceiver of said digital communication network.

2. A method as in claim 1 additionally comprising the step of:

(c) maintaining a connection at a network layer above a data link layer by establishing a lower level connection and using radio frequency bandwidth only when required.

3. A method as in claim 1 additionally comprising the step of:

looping back synchronizing and maintenance bits on the ISDN link to spoof an ISDN physical layer protocol.

4. A method as in claim 1 additionally comprising the step of:

looping back an LAPD layer protocol by removing flag bits.

5. For use with a digital communication network having a first digital communication path for coupling data communication signals with a first wireless transceiver at a first site, said first wireless transceiver being operative to conduct wireless communications with a second wireless transceiver at a second site, a method of controlling wireless communication bandwidth comprising the steps of:

(a) in response to establishment of a communication session between said first and second sites, controlling said first wireless transceiver to appear to said first digital communication path as though the bandwidth is continuously available during said communication session for wireless communications between said first and second transceivers, irrespective of a need to transport data communication signals between said first and second sites; and

(b) in the absence of said need to transport data communication signals between said first and second sites, making said bandwidth available for wireless communication by another wireless transceiver of said digital communication network.

6. A method as in claim 5 additionally comprising the step of:

(c) maintaining a connection at a network layer above a data link layer by establishing a lower level connection and using radio frequency bandwidth only when required.

7. A method as in claim 6 additionally comprising the step of:

(d) looping back synchronizing and maintenance bits on the link layer to spoof a physical layer protocol.

8. A method as in claim 6 additionally comprising the step of:

(e) looping back a higher layer protocol by removing flag bits.

9. A method as in claim 5 wherein the first and second wireless transceivers use Code Division Multiple Access (CDMA) to conduct wireless communication.

10. A digital communication system comprising:

a first wireless transceiver located at a first site, said first wireless transceiver being coupled to receive data communication signals from a first digital communication path, and being operative to conduct wireless communications;

a second wireless transceiver located at a second site, said second wireless transceiver being operative to conduct wireless communication with said first wireless transceiver;

means for establishing a communication session between said first and second sites, and for controlling said first wireless transceiver to appear to said first digital communication path as though communication bandwidth is continuously available during said communication session for wireless communication between said first and second transceivers, irrespective of a need to transport data communication signals between said first and second sites;

means for making said bandwidth available for wireless communication by another wireless transceiver of said digital communication network, in the absence of said need to transport data communication signals between said first and second sites; and

means for maintaining a connection at a network layer above a data link layer by establishing a lower level connection and using radio frequency bandwidth only when required.

11. A system as in claim 10 additionally comprising:

means for looping back synchronizing and maintenance bits on the like layer to spoof a physical layer protocol.

12. A system as in claim 10 additionally comprising:

means for looping back a higher layer protocol by removing flag bits.

13. A system as in claim 10 wherein the first and second wireless transceivers use Code Division Multiple Access (CDMA) to conduct wireless communication.