Hybrid wireless wire-line network integration and management

• US 6,021,158 A
• Filed: 10/31/1996
• Issued: 02/01/2000
• Est. Priority Date: 05/09/1996
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Weiner, Douglas B., Chen, Walter Y., Schurr, Paul E.
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): GHAYOUR, MOHAMMAD H
• Application Number:
  US08/741,777
• Time in Patent Office: 1,188 Days
• Field of Search: 375/211, 375/222, 375/220, 455/4.2, 455/507, 455/554, 455/555, 455/561
• US Class Current: 375/211
• 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 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0023 characterised by the signalling
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03611 Iterative algorithms
• CPC Class Codes: H04L 25/03 Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/4921 using quadrature encoding, e.g. carrierless amplitude-phase coding
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 27/2656 Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
• CPC Class Codes: H04M 11/062 : using different frequency bands for speech and other data

Abstract

A modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided. This modem supports multiple line codes, like DMT and CAP. The modem uses a Digital Signal Processor (DSP), so that different existing ADSL line codes, such as Discrete MultiTone (DMT) and Carrierless AM/PM (CAP), can be implemented on the same hardware platform. The modem negotiates in real-time, for a desired line transmission rate to accommodate line condition and service-cost requirement. The line code and rate negotiation process may be implemented at the beginning of each communication session through the exchange of tones between the modems. A four-step MDSL modem initialization process is provided for line code and rate compatibility.

Claims

1. A two-way communications system, comprising:

circuitry at a centrally located point for providing communications signals in the form of digital data from other communications systems or networks to a preselected multiplicity of subscriber locations.

a node connected to said circuitry for two way wireless point-to-multipoint communications links,

a wireless network unit for receiving said multipoint communications and providing preselected portions of said communications to respective end users using one or more single-pair or two-pair copper wire transmission links,

said node for two way wireless point-to-multipoint communications links comprising two-way microwave or millimeter wave wireless circuitry,

a plurality of nodes for two way wireless point-to-multipoint communications links which are distributed in a manner to provide information from said centrally located point to a multiplicity of local areas distributed around and adjacent said centrally located point,

a receiver located at each of said local areas,

circuitry for converting received microwave signals to data signals which can be transmitted over copper pair wires from one of said local areas to one or more subscribers served by said local area and; and

circuitry for converting data signals received from the end subscribers via copper pair wires into microwave signals for transmission to said centrally located point,

a node containing circuitry for converting received microwave signals into suitable data signals for serving subscribers via copper pair wires, and circuitry for converting data signals from copper pair wires into microwave signals for wireless transmission, and

for selecting between a set of subscriber available bandwidths, and circuitry for controlling bandwidth allocation.

2. A two-way communications system, comprising:

circuitry at a centrally located point for providing communications signals in the form of digital data from other communications systems or networks to a preselected multiplicity of subscriber locations,

a node connected to said circuitry for two way wireless point-to-multipoint communications links, and

a wireless network unit for receiving said multipoint communications and providing preselected portions of said communications to respective end users using one or more single-pair or two-pair copper wire transmission links,

said node for two way wireless point-to-multipoint communications links comprising two-way microwave or millimeter wave wireless circuitry,

a plurality of nodes for two way wireless point-to-multipoint communications links which are distributed in a manner to provide information from said centrally located point to a multiplicity of local areas distributed around and adjacent said centrally located point,

a receiver located at each of said local areas,

circuitry for converting received microwave signals to data signals which can be transmitted over copper pair wires from one of said local areas to one or more subscribers served by said local area and; and

circuitry for converting data signals received from the end subscribers via copper pair wires into microwave signals for transmission to said centrally located point,

a node containing circuitry for converting received microwave signals into suitable data signals for serving subscribers via copper pair wires, and circuitry for converting data signals from copper pair wires into microwave signals for wireless transmission, and

circuitry for dynamically adapting channel band capacity for wireless transmission based upon data rate demand, circuitry for changing a continuously variable subscriber bandwidth, and circuitry for controlling bandwidth allocation.

3. A two-way communications system, comprising:

circuitry at a centrally located point for providing communications signals in the form of digital data from other communications systems or networks to a preselected multiplicity of subscriber locations,

a node connected to said circuitry for two way wireless point-to-multipoint communications links, and

a wireless network unit for receiving said multipoint communications and providing preselected portions of said communications to respective end users using one or more single-pair or two-pair copper wire transmission links,

said node for two way wireless point-to-multipoint communications links comprising two-way microwave or millimeter wave wireless circuitry,

a plurality of nodes for two way wireless point-to-multipoint communications links which are distributed in a manner to provide information from said centrally located point to a multiplicity of local areas distributed around and adjacent said centrally located point,

a receiver located at each of said local areas,

circuitry for converting received microwave signals to data signals which can be transmitted over copper pair wires from one of said local areas to one or more subscribers served by said local area and; and

circuitry for converting data signals received from the end subscribers via copper pair wires into microwave signals for transmission to said centrally located point,

a node containing circuitry for converting received microwave signals into suitable data signals for serving subscribers via copper pair wires, and circuitry for converting data signals from copper pair wires into microwave signals for wireless transmission, and

circuitry for dynamically adapting channel band capacity and for adjusting transmitted data rates for wireless transmission based upon measured inband signal degradation.