WO2001020892A2 - Procede de transmission de donnees entre un premier et un deuxieme modems dans un systeme de telecommunication et systeme de telecommunication - Google Patents

Procede de transmission de donnees entre un premier et un deuxieme modems dans un systeme de telecommunication et systeme de telecommunication Download PDF

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Publication number
WO2001020892A2
WO2001020892A2 PCT/IE2000/000105 IE0000105W WO0120892A2 WO 2001020892 A2 WO2001020892 A2 WO 2001020892A2 IE 0000105 W IE0000105 W IE 0000105W WO 0120892 A2 WO0120892 A2 WO 0120892A2
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WO
WIPO (PCT)
Prior art keywords
modem
data transmission
modems
transmission rate
switch signal
Prior art date
Application number
PCT/IE2000/000105
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English (en)
Other versions
WO2001020892A3 (fr
Inventor
Michael Joseph Mclaughlin
Original Assignee
Fernway Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fernway Limited filed Critical Fernway Limited
Priority to AU70361/00A priority Critical patent/AU7036100A/en
Publication of WO2001020892A2 publication Critical patent/WO2001020892A2/fr
Publication of WO2001020892A3 publication Critical patent/WO2001020892A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Definitions

  • the present invention relates to a method for transmitting data between respective first and second modems in a telecommunications system, and the invention also relates to an improved telecommunications system.
  • Echo can present problems. Echo typically arises where data is being transmitted at relatively high data transmission rates at relatively high power levels. It is known to provide echo cancellers for cancelling out echo, however in data transmission systems where digitised data is being transmitted, echo can cause significant problems as a result of distortion and corruption of data signals. This is a particular problem where data is being transmitted and received through a PCM modem due to the fact that received data signals are sampled at a relatively low resolution codec before an echo canceller has had the opportunity of removing echo from data signals. Telecommunications systems and methods for optimising between data transmission rates and echo are known. For example, in U.S. Patent Specification No.
  • a high volume of data may have to be transmitted in one direction while the volume of data in the opposite direction may be relatively low, and during a subsequent part of the data transmission, the positions may be reversed whereby it may be necessary to transmit a large volume of data in the direction in which originally only a low volume data transmission was required, and vice versa.
  • none of the known systems adequately provide for such a situation.
  • the present invention is directed towards providing such a telecommunications system and a method.
  • a method for transmitting data between respective first and second modems in a telecommunications system wherein at least one of the modems is a PCM modem wherein the method comprises the steps of selecting respective high and low data transmission rates for the respective modems during handshaking, the respective high and low data transmission rates for the respective modems being the same or different, and setting the modems to transmit at their respective high data transmission rates during transmission in response to the volume of data to be transmitted such that neither of the two modems are set to transmit at their respective high data transmission rates until the other of the two modems has been set to transmit at its low data transmission rate.
  • the high data transmission rates of the respective modems are different.
  • the low data transmission rates of the respective modems are different.
  • the high and low data transmission rates of the first modem are selected by selecting corresponding high and low transmission power levels.
  • the high and low data transmission rates of the first modem are selected by selecting the spacing between signal levels of the data signal to be transmitted.
  • the high and low data transmission rates of the second modem are selected by selecting the spacing between signal levels of the data signal to be transmitted.
  • the data signals are transmitted as constellation points.
  • the low data transmission rate of the first modem is selected by increasing the spacing between the constellation points.
  • the low data transmission rate of the second modem is selected by increasing the spacing between the constellation points.
  • the respective modems are responsive to a switch signal received from the other of the two modems for switching from one data transmission rate to the other.
  • the second modem is responsive to the received switch signal received from the first modem for switching from its high data transmission rate to its low data transmission rate.
  • each modem is responsive to the received switch signal for switching from its high data transmission rate to its low data transmission rate.
  • each modem is responsive to the received switch signal only if the volume of data to be transmitted by that modem no longer requires the high data transmission rate.
  • the switch signal is provided by a predetermined signal.
  • the switch signal comprises at least one illegal constellation point.
  • the at least one illegal constellation point is followed by a predetermined sequence of legal constellation points.
  • the switch signal comprises a predetermined sequence of legal constellation points.
  • the predetermined sequence of legal constellation points is an illegal sequence.
  • the switch signal comprises a predetermined frame of data signals.
  • the switch signal comprises a reversed bit or byte.
  • the respective high and low data transmission rates of at least one of the modems are determined in response to the amount of echo.
  • the high and low data transmission rates of the at least one modem are determined for minimising echo.
  • the respective high and low data transmission rates are determined for the first modem in response to echo.
  • the respective high and low data transmission rates are determined for the second modem in response to echo.
  • the data signals transmitted between the respective first and second modems are digitally encoded data signals.
  • the first modem is a PCM codec modem.
  • the second modem is a linear codec modem.
  • the respective high and low data transmission rates of the respective modems are alterable during a retraining interrupt during data transmission.
  • the invention provides a telecommunications data transmission system comprising respective first and second modems wherein at least one of the modems is a PCM modem, the respective first and second modems comprising handshaking means, wherein the respective handshaking means of each modem comprise a selecting means for selecting respective high and low data transmission rates for the respective modems during handshaking, the respective high and low data transmission rates for the respective modems being the same or different, and each modem comprises a means for setting its data transmission rate at its high data transmission rate in response to the volume of data to be transmitted such that neither of the two modems are set to transmit at their respective high data transmission rates until the other of the two modems has been set to transmit at its low data transmission rate.
  • the high data transmission rates of the respective modems are different.
  • the low data transmission rates of the respective modems are different.
  • the selecting means of the first modem selects the high and low data transmission rates of the first modem by selecting corresponding high and low transmission power levels.
  • the selecting means of the first modem selects the high and low data transmission rates of the first modem by selecting the spacing between signal levels of the data signal to be transmitted.
  • the selecting means of the second modem selects the high and low data transmission rates of the second modem by selecting the spacing between signal levels of the data signal to be transmitted.
  • the data signals are transmitted as constellation points.
  • the selecting means of the first modem selects the low data transmission rate of the first modem by increasing the spacing between the constellation points.
  • the selecting means of the second modem selects the low data transmission rate of the second modem by increasing the spacing between the constellation points.
  • each modem comprises a switch signal generating means for generating a switch signal in response to the volume of data to be transmitted by that modem, and the means for setting the data transmission rate of each modem being responsive to a switch signal received from the other of the two modems for switching the modem having received the switch signal from one data transmission rate to the other.
  • the means for setting the data transmission rate of the second modem is responsive to the received switch signal received from the first modem for switching from its high data transmission rate to its low data transmission rate.
  • the means for setting the data transmission rate of each modem is responsive to the received switch signal for switching from its high data transmission rate to its low data transmission rate.
  • the means for setting the data transmission rate of each modem is responsive to the received switch signal only if the volume of data to be transmitted by that modem no longer requires the high data transmission rate.
  • the switch signal is provided by a predetermined signal.
  • the switch signal comprises at least one illegal constellation point.
  • the at least one illegal constellation point is followed by a predetermined sequence of legal constellation points.
  • the switch signal comprises a predetermined sequence of legal constellation points.
  • the predetermined sequence of legal constellation points is an illegal sequence.
  • the switch signal comprises a predetermined frame of data signals.
  • the switch signal comprises a reversed bit or byte.
  • the selecting means for selecting the respective high and low data transmission rates of at least one of the modems selects the respective data transmission rates in response to the amount of echo.
  • the selecting means for selecting the high and low data transmission rates of the at least one of the modems selects the respective data transmission rates for minimising echo.
  • the selecting means of the first modem selects the respective high and low data transmission rates for the first modem in response to echo.
  • the selecting means of the second modem selects the respective high and low data transmission rates for the second modem in response to echo.
  • the data signals transmitted between the respective first and second modems are digitally encoded data signals.
  • the first modem is a PCM codec modem.
  • the second modem is a linear codec modem.
  • the selecting means of the respective first and second modems are operational for altering the respective selected high and low data transmission rates of the respective modems during a retraining interrupt during data transmission.
  • the advantages of the invention are many.
  • the modem from which the highest volume of data is to be transmitted can be set at its high data transmission rate, while the other modem is set to transmit data at its low data transmission rate.
  • the modem which had been transmitting at the low data transmission rate can be set to transmit data at its high data transmission rate, after the other modem has been set to transmit its low data transmission rate. This, thus, leads to particularly efficient transmission of data, furthermore, minimises distortion and corruption of transmitted data.
  • the method and telecommunications system according to the invention are particularly suitable for use in a transmission system where at least one of the modems is PCM modem, and indeed where the other modem may also be a PCM modem, or a linear codec modem or the like.
  • Fig. 1 is a block representation of a telecommunications system according to the invention
  • Fig. 2 is a timing chart illustrating the operation of the telecommunications system of Fig. 1 .
  • Fig. 3 is a timing chart illustrating the operation of the telecommunications system according to another embodiment of the invention.
  • a telecommunications system which is indicated generally by the reference numeral 1.
  • data is being transmitted through the telecommunications system 1 between a PC 2 of a client and a server 3 of an internet service provider.
  • First and second modems namely, a first modem provided by a PCM codec modem 5 associated with the server 3, and a second modem, namely, a linear codec modem 6 associated with the PC 2 communicate the server 3 and the PC 2 through the telecommunications system 1.
  • the data is digitised data and is transmitted between the modems 5 and 6 as a series of constellation points.
  • First and second receive data buffers 10 and 11 respectively, receive data for the server and the PC 2, respectively, transmitted by the other of the server 3 and the PC 2.
  • Respective first and second control means namely, first and second microprocessors 14 and 15, respectively, control the operation of the PCM modem 5 and the linear modem 6 and their corresponding first and second transmit data buffers 8 and 9, as well as the first and second receive buffers 10 and 11 , as will be described below.
  • first and second microprocessors 14 and 15 may be incorporated in the corresponding modems 5 and 6, respectively, or the second microprocessor 15 could be implemented by the PC 2, and the first microprocessor 14 could be implemented by a computer controlling the server 3.
  • a selecting means implemented by software in the first microprocessor 14 reads the results of the test data transmission between the PCM modem 5 and the linear modem 6, and selects a suitable high data transmission rate and a suitable low data transmission rate for the PCM modem 5 which minimises echo.
  • a selecting means implemented by software in the second microprocessor reads the results of the test data transmission between the PCM modem 5 and the linear modem 6 and selects a suitable high data transmission rate and a suitable low data transmission rate for the linear modem 6 also for minimising echo.
  • the high data transmission rates for the respective modems 5 and 6 may be the same or different, however, in general, they will be different, and the low data transmission rates selected for the PCM modem 5 and the linear modem 6 may likewise be the same or different, but typically, will be different. Methods for selecting a high and a low data rate for a modem for minimising echo will be well known to those skilled in the art.
  • Each first and second microprocessor 14 and 15 comprises a means for generating a switch signal, which is implemented by software, in response to the microprocessor 14 or 15 detecting overflow of data from its corresponding transmit data buffer 8 or 9, if the corresponding modem 5 or 6 is operating at its low data transmission rate.
  • the switch signal is a predetermined signal as will be described below.
  • Each first and second microprocessor 14 and 15 comprises a means for setting the data transmission rate of its corresponding modem 5 or 6 at its appropriate high or low data transmission rate in response to a received switch signal.
  • the respective means for setting the data transmission rates are implemented in software in the corresponding microprocessor 14 and 15.
  • the second microprocessor 15 detecting overflow of the second transmit data buffer 9 indicating an increased volume of data to be transmitted by the PC 2 to the server 3 the second microprocessor 15 generates the switch signal and relays the switch signal to the linear modem 6 for transmission to the PCM modem 5 and reception by the first microprocessor 14.
  • the first microprocessor 14 checks the status of the first transmit data buffer
  • the first microprocessor 14 sets the PCM modem 5 to transmit at its low data transmission rate.
  • the second microprocessor 15 sets the linear modem 6 to transmit at its high data transmission rate.
  • the PCM modem 5 continues to transmit at its low data transmission rate and the linear modem 6 continues to transmit at its high data transmission rate until the first microprocessor 14 detects the first transmit data buffer 8 commencing to overflow.
  • the first microprocessor 14 On an overflow situation being detected by the first microprocessor 14 in the first transmit data buffer 8, the first microprocessor 14 generates and transmits the switch signal through the PCM modem 5 to the linear modem 6 which is received by the second microprocessor 15.
  • the second microprocessor 15 checks the status of the second transmit data buffer
  • the second microprocessor 15 sets the linear modem 6 to transmit at its low data transmission rate.
  • the first microprocessor 14 sets the PCM modem 5 to transmit at its high data transmission rate, and so operation of the telecommunications system 1 continues.
  • a timing chart for the operation of the telecommunications system 1 will now be described.
  • the PCM modem is operating at its low data transmission rate, which in this embodiment of the invention is at a low power level.
  • the linear modem 6 is operating at its high data transmission rate.
  • the first microprocessor 14 determines that the first transmit data buffer 8 is commencing to overflow and transmits a switch signal to the second microprocessor 15 through the PCM modem 5 and the linear modem 6.
  • the second microprocessor 15 determines that the linear modem 6 can be operated at its low data transmission rate, and at time t 2 sets the linear modem 6 to transmit at its low data transmission rate.
  • the linear modem 6 is operated at the same power level during its high and low data transmission rates, however, during its low data transmission rate the spacing between the levels at which constellation points are transmitted is increased as can be seen in Fig. 2.
  • the first microprocessor 14 sets the PCM modem 5 to transmit at its high data transmission rate, and in this embodiment of the invention increases the power level at which the PCM modem 5 is operating to a high power level, as can be seen in Fig. 2.
  • the PCM modem 5 When operating at its high data transmission rate the PCM modem 5 operates at a significantly higher power level than when operating at its low data transmission rate, however, the spacing between the levels at which the constellation points are transmitted remains unaltered from its low data transmission rate.
  • the second microprocessor 15 detects the second transmit data buffer 9 commencing to overflow indicating a high volume of data to be transmitted from the PC 2.
  • the second microprocessor 15 transmits a switch signal through the linear modem 6 and the PCM modem 5 for reception by the first microprocessor 14.
  • the first microprocessor 14 reads the first transmit data buffer 8 which indicates that the volume of data being transmitted by the server 3 does not require the PCM modem to transmit at its high data transmission rate, and at time t 5 the first microprocessor 14 sets the PCM modem 5 to operate at its low data transmission rate.
  • the second microprocessor 15 on detecting from the second receive data buffer 11 that the PCM modem 5 is transmitting data at its low data transmission rate sets the linear modem 6 at time t ⁇ to operate at its high data transmission rate.
  • the power level at which the linear modem 6 operates between its high and low data transmission rate remains unchanged, however, the spacing between the levels at which constellation points can be transmitted is significantly increased thereby permitting data to be transmitted by the linear modem 6 at a significantly higher rate.
  • the spacing between the levels at which constellation points can be transmitted during the high data transmission rate of the linear modem 6 is set to accommodate a relatively high number of constellation points, while at its low data transmission rate the spacing between the constellation point level is such as to facilitate transmission of a lesser number of constellation points.
  • the operation of the telecommunications system 1 continues with the PCM modem 5 operating at its low data transmission rate and the linear modem 6 operating at its high data rate until time t 7 .
  • the first microprocessor 14 detects a high volume of data to be transmitted by the PCM modem 5 from the server 3, and the first microprocessor 14 transmits a switch signal which is responded to by the second microprocessor 15 setting the linear modem 6 to transmit at time t ⁇ at its low data transmission rate.
  • the first microprocessor 14 sets the PCM modem 5 to transmit at its high data rate until times t 10 , tn and t 12 at which stage the position is again reversed.
  • the microprocessor which has received the switch signal will fail to respond to the switch signal until such time as the volume of data to be transmitted associated with that microprocessor has reduced to a level which could be accommodated by the modem transmitting at its low data transmission rate.
  • the switch signal may be any predetermined signal which is understood by the respective first and second microprocessors 14 and 15. Since the telecommunications system 1 is transmitting data as a series of constellation points, the switch signal may be provided by an illegal constellation point, or an illegal constellation point followed by a predetermined sequence of legal constellation points. Alternatively, the switch signal may be provided by a predetermined sequence of legal constellation points, or alternatively may be provided by a predetermined illegal sequence of legal constellation points.
  • An illegal constellation point is a constellation point which would not be used in the communications protocol.
  • An illegal sequence of constellation points is a sequence of constellation points which would not be used in the transmission protocol.
  • a method for providing a switch signal which is specific to the protocol in use could for example be provided by an inverted HDLC CRC or some other transformation of the CRC, for example, bit reversed, byte reversed, add/subtract a fixed number, or the like.
  • a specific type of frame of data may be used.
  • Fig. 3 a timing chart of a method according to an alternative embodiment of the invention for switching the modems 5 and 6 between their respective high and low data transmission rates will now be described.
  • the first microprocessor 14 which is associated with the PCM modem 5 controls switching of the respective modems 5 and 6 between their respective high and low data transmission rates.
  • the PCM modem 5 is transmitting at its low data transmission rate and the linear modem 6 is transmitting at its high data transmission rate.
  • the first microprocessor 14 determines from the first transmit data buffer 8 that the volume of data to be transmitted by the server requires the PCM modem 5 to operate at its high data transmission rate, and at time t
  • the second microprocessor 15 receives the switch signal and at time t 3 sets the linear modem 6 to operate at its low data transmission rate and retransmits the switch signal back to the first microprocessor 15 through the linear modem 6 and the PCM modem 5.
  • the first microprocessor 14 receives the returned switch signal and at time t 5 sets the PCM modem 5 to operate at the high data transmission rate.
  • the first microprocessor 14 determines that it is no longer necessary for the PCM modem 5 to operate at its high data transmission rate and accordingly, at time t ⁇ transmits a switch signal to the second microprocessor 15 through the respective PCM and linear modems 5 and 6, respectively.
  • the first microprocessor 14 sets the PCM modem 5 to operate at its low data transmission rate.
  • the second microprocessor 15 receives the switch signal and at time t 9 sets the linear modem 6 to operate at its high data transmission rate.
  • telecommunications system 1 has been described as comprising a PCM codec modem and a linear codec modem, it will be appreciated that the system may be provided with two PCM codec modems.

Abstract

L'invention concerne un système de transmission de données de télécommunication (1) destiné à la communication entre un PC client (2) et un serveur (3) d'un fournisseur d'accès à l'Internet; le système comprend la transmission de données entre un modem codec MIC (5) du serveur (3) et un modem codec linéaire (6) du PC (2). Les données reçues par le modem MIC (5) pour le serveur (3) passent par des premiers tampons de données de transmission (8, 9) qui gardent les données à transmettre par le modem MIC (5) et le modem linéaire (8, 9) respectivement. Un premier et un deuxième microprocesseurs (14, 15) contrôlent le débit de transmission de données des modems (5, 6), respectivement. Lors de l'établissement d'une liaison, le microprocesseur (14, 15) sélectionne le débit de transmission de données des modems MIC (5) et linéaire (6) de manière à réduire au minimum l'écho pendant la transmission. Le modem (5, 6) qui doit transmettre un volume de données plus important fonctionne sélectivement avec son débit élevé, alors que les deux autres modems (5, 6) fonctionnent avec un débit peu élevé. Les microprocesseurs (14, 15) contrôlent les modems de manière à éviter que les deux modems (5, 6) ne fonctionnent simultanément avec leurs débits élevés de transmission de données.
PCT/IE2000/000105 1999-09-13 2000-09-13 Procede de transmission de donnees entre un premier et un deuxieme modems dans un systeme de telecommunication et systeme de telecommunication WO2001020892A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU70361/00A AU7036100A (en) 1999-09-13 2000-09-13 A method for transmitting data between respective first and second modems in a telecommunications system, and telecommunications system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IE990767 1999-09-13
IES990767 1999-09-13

Publications (2)

Publication Number Publication Date
WO2001020892A2 true WO2001020892A2 (fr) 2001-03-22
WO2001020892A3 WO2001020892A3 (fr) 2001-11-08

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AU (1) AU7036100A (fr)
WO (1) WO2001020892A2 (fr)

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