Method and apparatus for a spectrally compliant cellular communication system

• US 8,463,255 B2
• Filed: 04/07/2003
• Issued: 06/11/2013
• Est. Priority Date: 12/20/1999
• Status: Expired due to Fees

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Amalfitano, Carlo, Proctor, James A. Jr.
• Primary Examiner(s): PATEL, MAHENDRA R
• Application Number:
  US10/409,031
• Publication Number:
  US 20040043751A1
• Time in Patent Office: 3,718 Days
• Field of Search: 455/403, 455/450, 455/422.1, 455423-425, 455/17, 455/20, 455/118, 455/452.1, 455/452.2, 455/455, 455/509, 455515-517, 455/445, 455/439, 370/280, 370/335, 370/341, 370/441, 370/329, 370/342, 370/352, 370/458, 370/209, 340/7.39, 713/169
• US Class Current: 455/422.1
• CPC Class Codes: H04B 7/216 Code division or spread-spectrum multiple access [CDMA, SSMA]
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0042 Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape H04L1/0067 takes precedence
• CPC Class Codes: H04L 25/00 Baseband systems
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/185 using make before break
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

A system for wireless data transmission that uses a channel bandwidth, channel separation, and radio frequency power spectrum which is compatible with existing deployments of wireless voice services. The transmitted waveforms are thus compatible with existing cellular networks. However, the time domain digital coding, modulation, and power control schemes are optimized for data transmission. Existing cellular network sites can thus be used to provide a high speed service optimized for wireless data traffic without the need for new radio frequency planning, and without interfering with existing voice service deployments.

Claims

1. A method for use in a subscriber unit for providing data transmissions to a base station in a wireless communication network, the method comprising:

receiving a plurality of allocated channels from the base station, wherein at least one of the plurality of allocated channels is used for data transmissions;

encoding a data signal using a data encoding scheme optimized for data transmissions, wherein the data encoding scheme uses an encoding different than the encoding used for a voice signal, wherein a number of the plurality of allocated channels changes during the transmission of the data signal; and

modulating the encoded data signal such that the modulated bandwidth and power spectrum of the encoded data signal are optimized for data transmissions, wherein the modulated bandwidth and power spectrum of the encoded data signal is the same as the modulated bandwidth and power spectrum for a modulated voice signal; and

transmitting the modulated data signal;

wherein the plurality of allocated channels are allocated on an instantaneous basis, and

wherein the plurality of allocated channels are allocated based on the demands of the data transmissions.

2. The method of claim 1 wherein the modulating uses spread spectrum modulation to produce a code division multiple access (CDMA) signal.

3. The method of claim 1 wherein the rate of the encoding is based on signal strength.

4. The method of claim 1 wherein the rate of encoding is based on a signal to noise ratio.

5. The method of claim 1 wherein the rate of encoding is based on a signal to interference ratio.

6. The method of claim 1 further comprising:

transmitting the modulated data signal over one or more channels, such that it is compatible with existing cellular networks from a frequency domain perspective.

7. A code division multiple access (CDMA) user device comprising:

an antenna configured to receive a plurality of allocated channels from a base station, wherein at least one of the plurality of allocated channels is used for data transmissions;

an encoder configured to encode a data signal using a data encoding scheme optimized for data transmissions, wherein the data encoding scheme uses an encoding different than the encoding used for a voice signal, wherein a number of the plurality of allocated channels changes during the transmission of the data signal; and

a modulator configured to modulate the encoded data signal such that the modulated bandwidth and power spectrum of the encoded data signal are optimized for data transmission, wherein the modulated bandwidth and power spectrum of the encoded data signal is the same as the modulated bandwidth and power spectrum of a modulated voice signal,

wherein the plurality of allocated channels are allocated on an instantaneous basis, and

wherein the plurality of allocated channels are allocated based on the demands of the data transmissions.

8. The CDMA user device according to claim 7 wherein the modulator is configured to use spread spectrum modulation to produce a code division multiple access (CDMA) signal.

9. The CDMA user device according to claim 7 wherein the modulator is configured to modulate the encoded data signal at a rate based on signal strength.

10. The CDMA user device according to claim 7 wherein the modulator is configured to modulate the encoded data signal based on a signal to noise ratio.

11. The CDMA user device according to claim 7 wherein the modulator is configured to modulate the encoded data signal based on a signal to interference ratio.