Method and apparatus for providing high speed data communications in a cellular environment

• US 20030053432A1
• Filed: 10/11/2002
• Published: 03/20/2003
• Est. Priority Date: 10/29/1996
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zehavi, Ephraim
• Granted Patent: US 8,085,865 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for transmitting digital data in a cellular environment. Adjacent cells of the cellular system are prevented from simultaneously transmitting data. Because the noise from transmissions of adjacent cells is a primary source of interference, the transmission rate of power limited base stations can be dramatically increased when the noise from adjacent cells is eliminated. The transmissions to each subscriber station are made at a fixed transmission power level. However, the data rate of transmitted signals differs from one subscriber station to another depending the path loss differences. In a first exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selecting an encoding rate for the transmitted signal while holding the symbol rate constant. In a second exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selection a modulation format for the transmitted signal which directly changes the symbol rate of transmission to a subscriber station.

Claims

1. A method for a communication system, comprising:

receiving a signal, carrying digital data, at a mobile station of a plurality of mobile stations, from a base station, in non-overlapping transmission bursts at a fixed predetermined power level, at a selected encoding rate, for a selected amount of data and with a selected modulation format, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames;

decoding said received signal to retrieve said digital data based on said selected encoding rate, said selected amount of data and said selected modulation format, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for said receiving at said mobile station of said plurality of mobile stations from said base station is based on an effective link budget for each of said plurality of mobile stations, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level.

2. The method as recited in claim 1 wherein said effective link budget for each of said plurality of mobile stations is based on an effective distance as measured by an effective transmission path loss between said base station and each of said plurality of mobile stations.

3. An apparatus for a communication system, comprising:

a receiver for receiving a signal, carrying digital data, at a mobile station of a plurality of mobile stations, from a base station, in non-overlapping transmission bursts at a fixed predetermined power level, at a selected encoding rate, for a selected amount of data and with a selected modulation format, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames;

a decoder for decoding said received signal to retrieve said digital data based on said selected encoding rate, said selected amount of data and said selected modulation format, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for said receiving at said mobile station of said plurality of mobile stations from said base station is based on an effective link budget for each of said plurality of mobile stations, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level.

4. The apparatus as recited in claim 3 wherein said effective link budget for each of said plurality of mobile stations is based on an effective distance as measured by an effective transmission path loss between said base station and each of said plurality of mobile stations.

5. A method for a communication system, comprising:

selecting an encoding rate for each of fixed and predetermined power level transmissions of digital data from a base station to each mobile station of a plurality of mobile stations in said communication system;

selecting an amount of data for each of said fixed and predetermined power level transmissions from said base station to each of said plurality of mobile stations;

selecting a modulation format for each of said fixed and predetermined power level transmissions from said base station to each of said plurality of mobile stations;

encoding and modulating said selected amount of data in accordance with said selected encoding data rate and said selected modulation format for each of said plurality of mobile stations;

transmitting from said base station, encoded and modulated data, to each of said plurality of mobile stations in non-overlapping transmission bursts at said fixed and predetermined power level, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for each of said fixed and predetermined power level transmissions from said base station to each of said plurality of mobile stations is based on an effective link budget for each of said plurality of mobile stations, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level;

receiving and decoding said transmission to retrieve said digital data based on said selected encoding rate, said selected amount of data and said selected modulation format.

6. The method as recited in claim 5 wherein said effective link budget for each of said plurality of mobile stations is based on an effective distance as measured by an effective transmission path loss between said base station and each of said plurality of mobile stations.

7. An apparatus for a communication system, comprising:

a controller for selecting an encoding rate, an amount of data and a modulation format for each of fixed and predetermined power level transmissions of digital data from a base station to each mobile station of a plurality of mobile stations in said communication system;

a transmitter for encoding and modulating said selected amount of data in accordance with said selected encoding data rate and said selected modulation format for each of said plurality of mobile stations, and for transmitting from said base station, encoded and modulated data, to each of said plurality of mobile stations in non-overlapping transmission bursts at said fixed and predetermined power level, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for each of said fixed and predetermined power level transmissions from said base station to each of said plurality of mobile stations is based on an effective link budget for each of said plurality of mobile stations, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level;

a receiver for receiving and decoding said transmission to retrieve said digital data based on said selected encoding rate, said selected amount of data and said selected modulation format.

8. The apparatus as recited in claim 7 wherein said effective link budget for each of said plurality of mobile stations is based on an effective distance as measured by an effective transmission path loss between said base station and each of said plurality of mobile stations.

9. An apparatus for a mobile station for communication with a base station in a communication system, comprising:

a controller for selecting an encoding rate, an amount of data and a modulation format for a fixed and predetermined power level transmission of digital data from said base station;

a transmitter for communicating said selected encoding rate, amount of data and modulation format to said base station, wherein said fixed and predetermined power level transmission is over non-overlapping transmission bursts from said base station, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for said fixed and predetermined power level transmission is based on an effective link budget for said mobile station, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level.

10. The apparatus as recited in claim 9 further comprising:

a receiver for receiving and decoding said transmission from said base station to retrieve said digital data based on said selected encoding rate, said selected amount of data and said selected modulation format.

11. The apparatus as recited in claim 9, wherein said effective link budget for said mobile station is based on an effective distance as measured by an effective transmission path loss between said base station and said mobile station.

12. A method for a mobile station for communication with a base station in a communication system, comprising:

selecting an encoding rate, an amount of data and a modulation format for a fixed and predetermined power level transmission of digital data from said base station;

communicating said selected encoding rate, amount of data and modulation format to said base station, wherein said fixed and predetermined power level transmission is over non-overlapping transmission bursts from said base station, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for said fixed and predetermined power level transmission is based on an effective link budget for said mobile station, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level.

13. The method as recited in claim 12 further comprising:

receiving and decoding said transmission from said base station to retrieve said digital data based on said selected encoding rate, said selected amount of data and said selected modulation format.

14. The method as recited in claim 12, wherein said effective link budget for said mobile station is based on an effective distance as measured by an effective transmission path loss between said base station and said mobile station.

15. A method for a base station for communication with a mobile station in a communication system, comprising:

receiving communication from said mobile station including information relating to a selected encoding rate, an amount of data and a modulation format for a fixed and predetermined power level transmission of digital data from said base station to said mobile station;

encoding and modulating said selected amount of data in accordance with said selected encoding data rate and said selected modulation format for transmission to said mobile station, wherein said fixed and predetermined power level transmission is over non-overlapping transmission bursts, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for said fixed and predetermined power level transmission is based on an effective link budget for said mobile station, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level.

16. The method as recited in claim 15 further comprising:

transmitting from said base station, encoded and modulated data, to said mobile station in non-overlapping transmission bursts at said fixed and predetermined power level over said predefined and fixed duration time frames.

17. The method as recited in claim 15, wherein said effective link budget for each of said mobile station is based on an effective distance as measured by an effective transmission path loss between said base station and said mobile station.

18. An apparatus for a base station for communication with a mobile station in a communication system, comprising:

a receiver for receiving communication from said mobile station including information relating to a selected encoding rate, an amount of data and a modulation format for a fixed and predetermined power level transmission of digital data from said base station to said mobile station;

an encoder for encoding and modulating said selected amount of data in accordance with said selected encoding data rate and said selected modulation format for transmission to said mobile station, wherein said fixed and predetermined power level transmission is over non-overlapping transmission bursts, wherein said non-overlapping transmission bursts are over predefined and fixed duration time frames, wherein at least one of said selected encoding rate, said selected modulation format and said selected amount of data for said fixed and predetermined power level transmission is based on an effective link budget for said mobile station, wherein said link budget includes a parameter indicating transmission set at said fixed and predetermined power level.

19. The apparatus as recited in claim 18 further comprising:

a transmitter for transmitting from said base station, encoded and modulated data, to said mobile station in non-overlapping transmission bursts at said fixed and predetermined power level over said predefined and fixed duration time frames.

20. The apparatus as recited in claim 18, wherein said effective link budget for each of said mobile station is based on an effective distance as measured by an effective transmission path loss between said base station and said mobile station.