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

• US 7,949,066 B2
• Filed: 03/29/2002
• Issued: 05/24/2011
• Est. Priority Date: 10/29/1996
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zehavi, Ephraim
• Primary Examiner(s): Ghebretinsae; Temesghen
• Application Number:
  US10/109,790
• Publication Number:
  US 20020106015A1
• Time in Patent Office: 3,343 Days
• Field of Search: 375/295, 375/358, 375/265, 375/377, 375/316, 370/341, 455/422, 455/436, 455/69
• US Class Current: 375/295
• 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 of providing a signal transmitted over the air from an infrastructure element to a remote unit in a wireless communication system, comprising:

receiving, at the infrastructure element, information indicative of a quality measure of a wireless channel for communications between the infrastructure element and the remote unit, wherein the information indicative of the quality measure is at least partially based on information received from the remote unit of physical location of the remote unit; and

determining a transmission rate representing a rate of signal bits transmitted over the air from the infrastructure element to the remote unit and a separate information rate representing a rate of user generated information bits by;

establishing the information rate by selecting, at the infrastructure element, based on the received information indicative of the quality measure, a channel encoding rate at which to encode the signal for subsequent transmission at the transmission rate at a fixed power level;

transmitting the signal at the transmission rate at said fixed power level; and

selectively altering the channel encoding rate at which the infrastructure element encodes the signal upon encountering changes in the information received from the remote unit of physical location of the remote unit.

2. The method of claim 1, wherein the signal comprises a channel encoding component and an information component, and establishing the information rate by selecting causes the channel encoding component to include a first predefined quantity of bits, which thereby causes the information component to include a second predefined quantity of bits.

3. The method of claim 1, wherein the establishing the information rate by selecting comprises selecting a channel encoding rate from among a predefined plurality of channel encoding rates.

4. An infrastructure element configured to provide a signal to be transmitted over the air to a remote unit in a wireless communication system, the infrastructure element comprising:

means for receiving information indicative of a quality measure of a wireless channel for communications between the infrastructure element and the remote unit, wherein the information indicative of the quality measure is at least partially based on information received from the remote unit of physical location of the remote unit; and

means for determining a transmission rate representing a rate of signal bits transmitted over the air from the infrastructure element to the remote unit and a separate information rate representing a rate of user generated information bits, including;

means for establishing the information rate by selecting, based on the received information indicative of the quality measure, a channel coding rate at which to encode the signal for transmission at the transmission rate at a fixed power level;

means for transmitting the signal at the transmission rate at said fixed power level;

whererin said means for determining is configured to selectively alter the channel coding rate at which the infrastructure element encodes the signal upon encountering changes in the information received from the remote unit of physical location of the remote unit.

5. The infrastructure element of claim 4, wherein the signal comprises a channel encoding component and an information component, and the means for establishing the information rate by selecting causes the channel encoding component to include a first predefined quantity of bits, which thereby causes the information component to include a second predefined quantity of bits.

6. The infrastructure element of claim 4, wherein the means for establishing the information rate by selecting comprises means for selecting a channel encoding rate from among a predefined plurality of channel encoding rates.

7. An infrastructure element configured to provide a signal transmitted over the air to a remote unit in a wireless communication system, comprising:

a receiver configured to receive information indicative of a quality measure of a wireless channel for communications between the infrastructure element and the remote unit, wherein the information indicative of the quality measure is at least partially based on information received from the remote unit of physical location of the remote unit;

a controller coupled to the receiver and configured to determine a transmission rate representing a rate of signal bits transmitted over the air from the infrastructure element to the remote unit and a separate information rate representing a rate of user generated information bits by establishing the information rate by selecting, based on the received information indicative of the quality measure, a channel coding rate at which to encode the signal for transmission at the transmission rate at a fixed power level; and

a transmitter coupled to the controller and configured to transmit the signal at the transmission rate at said fixed power level;

wherein the controller is configured to selectively alter the channel coding rate at which the infrastructure element encodes the signal upon encountering changes in the information received from the remote unit of physical location of the remote unit.

8. The infrastructure element of claim 7, wherein the signal includes an information component and a channel coding component, and wherein the controller causes the channel encoding component to include a first predefined quantity of bits, which thereby causes the information component to include a second predefined quantity of bits.

9. The infrastructure element of claim 7, wherein the controller is configured to select a channel encoding rate from among a predefined plurality of channel encoding rates.

10. A method of providing a signal from an infrastructure element to a remote unit over a wireless channel, comprising:

determining a transmission rate representing a rate of signal bits transmitted over the air from the infrastructure element and a separate information rate representing a rate of user generated information bits by;

transmitting to the infrastructure element information indicative of a quality measure of the wireless channel, wherein the information indicative of the quality measure is at least partially based on information received from the remote unit of physical location of the remote unit; and

establishing the information rate by selecting, based on the information indicative of the quality measure of the wireless channel, a channel coding rate at which to encode the signal for subsequent transmission at the transmission rate at a fixed power level; and

receiving at the remote unit the signal encoded at the channel coding rate,

wherein the signal is transmitted by the infrastructure element to the remote unit at the transmission rate at said fixed power level, and further wherein the channel coding rate is selectively altered based on changes in information received from the remote unit of physical location of the remote unit.

11. The method of claim 10, wherein the transmitting comprises transmitting information indicative of a measure of distance between the infrastructure element and the remote unit.

12. The method of claim 10, wherein the transmitting comprises transmitting information indicative of a measure of an effective distance between the infrastructure element and the remote unit.

13. A remote unit configured to receive a signal transmitted by an infrastructure element over a wireless channel, the remote unit comprising:

means for determining a transmission rate representing a rate of signal bits transmitted over the air from the infrastructure element and a separate information rate representing a rate of user generated information bits including;

means for transmitting to the infrastructure element information indicative of a quality measure of the wireless channel, wherein the information indicative of the quality measure is at least partially based on location of the remote unit, wherein the infrastructure element comprises means for establishing the information rate by selecting, based on the information indicative of the quality measure of the wireless channel, a channel coding rate at which to encode the signal for subsequent transmission at the transmission rate at the fixed power level; and

means for receiving at the remote unit the signal encoded at the channel coding rate,

wherein the signal is transmitted by the infrastructure element to the remote unit at the transmission rate at said fixed power level, and further wherein the channel coding rate is selectively altered based on changes in the location of the remote unit.

14. The remote unit of claim 13, wherein the means for transmitting comprises means for transmitting information indicative of a measure of distance between the infrastructure element and the remote unit.

15. The remote unit of claim 13, wherein the means for transmitting comprises means for transmitting information indicative of a measure of an effective distance between the infrastructure element and the remote unit.

16. A remote unit configured to receive a signal transmitted by an infrastructure element over a wireless channel, the remote unit comprising:

a transmitter configured to transmit to the infrastructure element information indicative of a quality measure of the wireless channel, wherein the information indicative of the quality measure is at least partially based on information received from the remote unit of location of the remote unit; and

a receiver configured to receive the signal encoded at an information rate that is based on the information indicative of the quality measure of the wireless channel, wherein the information rate is a rate of user generated information bits representing a maximum available data rate for data transmission at a transmission rate at a fixed power from the infrastructure element to the remote unit, and

wherein the signal is transmitted by the infrastructure element to the remote unit at the transmission rate at said fixed power and further wherein the information rate is selectively altered based on changes in the information received from the remote unit of physical location of the remote unit.

17. The remote unit of claim 16, wherein the information indicative of a quality measure includes information indicative of a measure of distance between the infrastructure element and the remote unit.

18. The remote unit of claim 16, wherein the information indicative of a quality measure includes information indicative of a measure of an effective distance between the infrastructure element and the remote unit.