Method and apparatus for compressing and transmitting ultra high speed data

• US 20070036124A1
• Filed: 10/23/2006
• Published: 02/15/2007
• Est. Priority Date: 11/07/1996
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kurtz, Scott
• Granted Patent: US 8,503,372 B2
• Time in Patent Office: Days
• US Class Current: 370/344
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
• CPC Class Codes: H04B 14/046 Systems or methods for reducing noise or bandwidth
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 25/4927 using levels matched to the quantisation levels of the channel
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• 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 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Voiceband compression techniques are employed in order to enable an RF telecommunications base station to accommodate data signals of high speed voiceband modems and FAX machines. An Ultra-High Speed Codec supports voiceband modem and FAX transmissions up to 14.4 kb/s and operates using four 16-phase RF slots. Because these codecs transmit information over several RF slots which can be contiguous, the slots within RF communication channels are dynamically allocated. The Dynamic Time slot/Bandwidth Allocation feature detects and monitors the data transmission and forms a data channel from the necessary number of slots.

Claims

1. A compression system in a telecommunications device for receiving a plurality of telephone signals having voice signals or data signals or a combination of both, comprising:

a digital signal processor that comprises a compression selector processor configured to receive a telephone signal, including a monitor and a control unit, wherein the monitor is configured to detect a data signal and to inform the control unit of the presence of the data signal, whereby the control unit identifies a speed type of the detected data signal by its characteristic modem answer tones; and

a plurality of codecs, including a first codec for voice signal compression coding and decoding, and a second codec for data signal compression coding and decoding; and

a channel forming processor configured to perform dynamic timeslot allocation of the data signals and the voice signals for transmitting each of the telephone signals on a respective communication channel, wherein each communication channel is formed on at least one transmit radio frequency (RF) carrier, each RF carrier having a plurality of information slots and at least one of the information slots is assigned to one of the telephone signals;

whereby the control unit initiates a set-up of a communication channel by sending a signal to the channel forming processor and the control unit selects which codec will process the voice compression and the data compression coding and decoding.

2. The system of claim 1, wherein the channel forming processor comprises:

a checking means for checking an assignment status of the information slots responsive to detection of the data signal, the assignment status indicating whether each carrier and each information slot is unassigned or assigned to another one of the telephone signals;

a locating means for locating a predetermined number of unassigned sequential information slots, the predetermined number being a first number for a low speed type, a second number for a high speed type and a third number for an ultra high speed type;

a forming means for forming the communication channel from the unassigned sequential information slots; and

a modulating means for modulating the coded signal on the communication channel.

3. The system of claim 2, wherein the predetermined number of sequential slots is one or two information slots for the low speed type, three or four information slots for the high speed type, and four information slots for the ultra high speed type.

4. The system of claim 3, wherein the predetermined number of sequential information slots is one or two slots for the high speed type and for the ultra high speed type when the predetermined number of unassigned sequential information slots is not located.

5. The system of claim 4, wherein each RF carrier includes four information slots, each information slot includes a guard, and the forming means forms the communication channel with one guard band.

6. The system of claim 1, wherein the second codec comprises a quantizer configured to process a series of non-uniformly companded samples of data and a forward error correcting (FEC) encoder configured to process uniformly quantized data samples produced by the quantizer.

7. The system of claim 6, wherein the second codec further comprises a block interleaver coupled to the FEC encoder configured to interleave the data samples processed by the FEC encoder.