Cellular communication system with dynamically modified data transmission parameters

• US 5,950,124 A
• Filed: 12/04/1995
• Issued: 09/07/1999
• Est. Priority Date: 09/06/1995
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Telxon Corporation (Zebra Technologies Corporation)
• Inventors: Paulsen, Victor K., Holt, James K., Grim, George L. III, Struhsaker, Paul F., Trompower, Michael L.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Ferguson, Keith
• Application Number:
  US08/566,502
• Time in Patent Office: 1,373 Days
• Field of Search: 455/422, 455/466, 455/557, 455/561, 455/562, 455/550, 455/551, 455/571, 455/572, 455/403, 455/23, 455/517, 455/65, 455/126, 455/522, 375/281, 342/463, 342/364, 342/362
• US Class Current: 455/422.1
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

An apparatus and process for improving the performance of a cellular communication system using direct sequence spread spectrum techniques. The apparatus and process enable dynamic modification of communication system parameters including PN code length, chipping rate and modulation technique for transmission of a data packet. Modification is based on proximity of the transmitter and receiver, transmitter and receiver capabilities and other factors. The system evaluates tradeoffs between data transmission speed and communication range to improve system performance.

Claims

1. A cellular communication system, comprising:

a plurality of base stations coupled to a system backbone, each of the base stations comprising a base station receiver system for receiving wireless communications and a base station transmitter system for transmitting wireless communications; and

a plurality of mobile terminals each for communicating with the system backbone by way of at least one of the plurality of base stations, each of the plurality of mobile terminals having a mobile terminal transmitter for transmitting wireless communications to the at least one the plurality of base stations and a mobile terminal receiver system for receiving wireless communications from the at least one of the plurality of base stations;

wherein, with respect to at least one of the mobile terminals, at least one of the mobile terminal transmitter system and the mobile terminal receiving system wirelessly communicates with the at least one of the plurality of base stations by selectively transmitting or receiving data according to a plurality of different PN code parameters as a result of dynamically modifying the transmitting or receiving PN code parameters based on predetermined criteria relating to achieving an optimal communication rate.

2. The cellular communication system of claim 1, wherein the mobile terminal transmitting system of the at least one mobile terminal is controllable to select any of a plurality of different data transmission rates.

3. The cellular communication system of claim 2, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths and selecting among different chipping rates.

4. The cellular communication system of claim 1, wherein the mobile terminal transmitting system of the at least one mobile terminal is controllable based on communications received from the at least one of the plurality of base stations.

5. The cellular communication system of claim 4, wherein the controllable mobile terminal transmitting system is configured to transmit initially at a first data transmission rate and, based on communications received from the at least one of the plurality of base stations, to transmit subsequently at a second data transmission rate.

6. The cellular communication system of claim 1, wherein the mobile terminal receiving system of the at least one mobile terminal is controllable to select any of a plurality of different data transmission rates.

7. The cellular communication system of claim 6, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths and selecting among different chipping rates.

8. The cellular communication system of claim 1, wherein the base station transmitting system and the base station receiving system of the at least one of the plurality of base stations have generally fixed PN code parameters.

9. The cellular communication system of claim 1, wherein at least one of the base station transmitting system and the base station receiving system of the at least one of the plurality of base stations wirelessly communicates with the at least one mobile terminal by selectively transmitting or receiving data according to any of a plurality of different PN code parameters.

10. The cellular communication system of claim 9, wherein the base station transmitting system of the at least one base station is controllable to select any of a plurality of different data transmission rates.

11. The cellular communication system of claim 10, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths and selecting among different chipping rates.

12. The cellular communication system of claim 10, wherein the base station transmitting system is controllable based on communications received from the at least one of the plurality of mobile terminals.

13. The cellular communication system of claim 1, wherein at least one of the plurality of base stations is coupled to the system backbone by way of a wireless connection.

23. The cellular communication system of claim 10, wherein the plurality of different transmission parameters comprise different antennas used to receive or transmit data.

14. A cellular communication system, comprising:

a plurality of base stations coupled to a system backbone, each of the base stations comprising a base station receiver system for receiving wireless communications and a base station transmitter system for transmitting wireless communications; and

a plurality of mobile terminals each for communicating with the system backbone by way of at least one of the plurality of base stations, each of the plurality of mobile terminals having a mobile terminal transmitter for transmitting wireless communications to the at least one the plurality of base stations and a mobile terminal receiver system for receiving wireless communications from the at least one of the plurality of base stations;

wherein, with respect to at least one of the mobile terminals, at least one of the mobile terminal transmitter system and the mobile terminal receiving system wirelessly communicates with a first of the at least one of the plurality of base stations by selectively transmitting or receiving data according to a plurality of different transmission parameters.

15. The cellular communication system of claim 14, wherein the mobile terminal transmitting system of the at least one mobile terminal is controllable to select any of a plurality of different data transmission rates.

16. The cellular communication system of claim 15, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths, selecting among different chipping rates, and selecting among different modulation schemes.

17. The cellular communication system of claim 14, wherein the mobile terminal receiving system of the at least one mobile terminal is controllable to select any of a plurality of different data transmission rates.

18. The cellular communication system of claim 17, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths, selecting among different chipping rates, and selecting among different modulation schemes.

19. The cellular communication system of claim 14, wherein the plurality of different transmission parameters comprise different power levels at which data is transmitted.

20. The cellular communication system of claim 14, wherein the base station transmitting system and the base station receiving system of the at least one of the plurality of base stations have generally fixed transmission parameters.

21. The cellular communication system of claim 14, wherein at least one of the base station transmitting system and the base station receiving system of the at least one of the plurality of base stations wirelessly communicates with the at least one mobile terminal by selectively transmitting or receiving data according to any of a plurality of different transmission parameters.

22. The cellular communication system of claim 14, wherein the plurality of different transmission parameters comprise different power levels at which data is transmitted.

24. The cellular communication system of claim 14, wherein at least one of the plurality of base stations is coupled to the system backbone by way of a wireless connection.

25. A cellular communication system, comprising:

a plurality of base stations coupled to a system backbone, each of the base stations comprising a base station receiver system for receiving wireless communications and a base station transmitter system for transmitting wireless communications; and

a plurality of mobile terminals each for communicating with the system backbone by way of at least one of the plurality of base stations, each of the plurality of mobile terminals having a mobile terminal transmitter for transmitting wireless communications to the at least one the plurality of base stations and a mobile terminal receiver system for receiving wireless communications from the at least one of the plurality of base stations;

wherein, with respect to at least one of the mobile terminals, at least one of the mobile terminal transmitter system and the mobile terminal receiving system wirelessly communicates with the at least one of the plurality of base stations by selectively transmitting or receiving data according to a plurality of different PN code parameters as a result of dynamically modifying the transmitting or receiving PN code parameters based on predetermined criteria relating to achieving an optimal communication rate; and

wherein at least another one of the mobile terminals cannot vary any of its transmission parameters.

26. The cellular communication system of claim 25, wherein the mobile terminal transmitting system of the at least one mobile terminal is controllable to select any of a plurality of different data transmission rates.

27. The cellular communication system of claim 25, wherein the mobile terminal receiving system of the at least one mobile terminal is controllable to select any of a plurality of different data transmission rates.

28. A cellular communication system, comprising:

a plurality of base stations coupled to a system backbone, each of the base stations comprising a base station receiver system for receiving wireless communications and a base station transmitter system for transmitting wireless communications; and

a plurality of mobile terminals each for communicating with the system backbone by way of at least one of the plurality of base stations, each of the plurality of mobile terminals having a mobile terminal transmitter for transmitting wireless communications to the at least one the plurality of base stations and a mobile terminal receiver system for receiving wireless communications from the at least one of the plurality of base stations;

wherein, with respect to the at least one of the base station, at least one of the base station transmitter system and the base station receiving system wirelessly communicates with one of the mobile terminals by selectively transmitting or receiving data according to a plurality of different PN code parameters as a result of dynamically modifying the transmitting or receiving data'"'"'s PN code parameters based on predetermined criteria relating to achieving an optimal communication rate.

29. The cellular communication system of claim 28, wherein the at least one base station is coupled to the system backbone by way of a wireless connection.

30. The cellular communication system of claim 28, wherein the base station transmitting system of the at least one base station is controllable to select any of a plurality of different data transmission rates.

31. The cellular communication system of claim 30, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths and selecting among different chipping rates.

32. A cellular communication system, comprising:

a plurality of base stations coupled to a system backbone, each of the base stations comprising a base station receiver system for receiving wireless communications and a base station transmitter system for transmitting wireless communications; and

a plurality of mobile terminals each for communicating with the system backbone by way of at least one of the plurality of base stations, each of the plurality of mobile terminals having a mobile terminal transmitter for transmitting wireless communications to the at least one the plurality of base stations and a mobile terminal receiver system for receiving wireless communications from the at least one of the plurality of base stations;

wherein, with respect to the at least one of the base station, at least one of the base station transmitter system and the base station receiving system wirelessly communicates with one of the mobile terminals by selectively transmitting or receiving data according to a plurality of different transmission parameters based on communications received from the mobile terminal.

33. The cellular communication system of claim 32, wherein the base station receiving system of the at least one base station is controllable to select any of a plurality of different data transmission rates.

34. The cellular communication system of claim 33, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths and selecting among different chipping rates.

35. The cellular communication system of claim 32, wherein the at least one base station is coupled to the system backbone by way of a wireless connection.

36. The cellular communication system of claim 32, wherein the base station transmitting system of the at least one base station is controllable to select any of a plurality of different data transmission rates.

37. The cellular communication system of claim 32, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths, selecting among different chipping rates, and selecting among different modulation schemes.

38. A cellular communication system, comprising:

a plurality of base stations coupled to a system backbone, each of the base stations comprising a base station receiver system for receiving wireless communications and a base station transmitter system for transmitting wireless communications; and

a plurality of mobile terminals each for communicating with the system backbone by way of at least one of the plurality of base stations, each of the plurality of mobile terminals having a mobile terminal transmitter for transmitting wireless communications to the at least one the plurality of base stations and a mobile terminal receiver system for receiving wireless communications from the at least one of the plurality of base stations;

wherein, with respect to the at least one of the base station, at least one of the base station transmitter system and the base station receiving system wirelessly communicates with one of the mobile terminals by selectively transmitting or receiving data according to a plurality of different PN code parameters as a result of dynamically modifying the transmitting or receiving PN code parameters based on predetermined criteria relating to achieving an optimal communication rate; and

wherein at least another one of the base stations cannot vary any of its transmission parameters.

39. The cellular communication system of claim 38, wherein the base station transmitting system of the at least one base station is controllable to select any of a plurality of different data transmission rates.

40. The cellular communication system of claim 38, wherein the base station receiving system of the at least one base station is controllable to select any of a plurality of different data transmission rates.

41. A base station coupled to a system backbone for use in a cellular communication system, the base station comprising:

a transmitting system for wirelessly communicating data to a mobile terminal included in the cellular communication system; and

a receiving system for wirelessly receiving data from the mobile terminal;

wherein at least on of the transmitting system and the receiving system wirelessly communicates with the mobile terminal by selectively transmitting or receiving data according to a plurality of different transmission parameters based on communications received from the mobile terminal.

42. The base station of claim 41, wherein the base station is coupled to the system backbone by way of a wireless connection.

43. The base station of claim 41, wherein the transmitting system is controllable to select any of a plurality of different data transmission rates.

44. The base station of claim 43, wherein any of the plurality of different data transmission rates is selected by way of at least one of selecting among different PN code lengths, selecting among different chipping rates, and selecting among different modulation schemes.

45. The base station of claim 41, wherein the transmitting system is controllable based on communications received from the mobile terminal.

46. The base station of claim 41, wherein the plurality of different transmission parameters comprise different power levels at which data is transmitted.