New! View global litigation for patent families

US20040223511A1 - Method and multi-carrier transceiver with stored application profiles for supporting multiple applications - Google Patents

Method and multi-carrier transceiver with stored application profiles for supporting multiple applications Download PDF

Info

Publication number
US20040223511A1
US20040223511A1 US10863247 US86324704A US2004223511A1 US 20040223511 A1 US20040223511 A1 US 20040223511A1 US 10863247 US10863247 US 10863247 US 86324704 A US86324704 A US 86324704A US 2004223511 A1 US2004223511 A1 US 2004223511A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
application
profile
applications
data
rate
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US10863247
Inventor
Marcos Tzannes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daphimo Co B V LLC
Original Assignee
Aware Inc
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

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/70Admission control or resource allocation
    • H04L47/80Actions related to the nature of the flow or the user
    • H04L47/803Application aware
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H04L1/0018Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement based on latency requirement
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025Transmission of mode-switching indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/007Unequal error protection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0071Use of interleaving
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0075Transmission of coding parameters to receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/38Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40Transmitting circuits; Receiving circuits
    • H04L25/49Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4906Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using binary codes
    • H04L25/4915Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using binary codes using pattern inversion or substitution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/2608Allocation of payload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/10Flow control or congestion control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/10Flow control or congestion control
    • H04L47/18End to end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/10Flow control or congestion control
    • H04L47/26Explicit feedback to the source, e.g. choke packet
    • H04L47/263Source rate modification after feedback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/70Admission control or resource allocation
    • H04L47/82Miscellaneous aspects
    • H04L47/826Involving periods of time
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/70Admission control or resource allocation
    • H04L47/82Miscellaneous aspects
    • H04L47/828Allocation of resources per group of connections, e.g. per group of users
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0064Rate requirement of the data, e.g. scalable bandwidth, data priority
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078Timing of allocation
    • H04L5/0087Timing of allocation when data requirements change
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • H04L5/0096Indication of changes in allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M11/00Telephonic communication systems adapted for combination with other electrical systems
    • H04M11/06Simultaneous speech and telegraphic or other data transmission over the same conductors
    • H04M11/062Simultaneous speech and telegraphic or other data transmission over the same conductors using different frequency bands for speech and other data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0057Block codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0042Arrangements for allocating sub-channels of the transmission path intra-user or intra-terminal allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078Timing of allocation
    • H04L5/008Timing of allocation once only, on installation

Abstract

A system and method for supporting multiple applications are described. A digital subscriber line system includes two transceivers in communication over a communication channel using multicarrier modulation. Application profiles are defined for characterizing transmission of information over the communication channel. Each application profile is a parameter set that is associated with a unique set of one or more applications that may become active between the transceivers and specifies the transmission requirements for such applications. Each transceiver stores the application profiles and transmits information over the communication channel according to the one of the stored application profiles. When a change in a number of applications active between the transceivers occurs, a second one of the application profiles is retrieved. The transceivers then transition to transmitting information over the communication channel according to the second application profile. The transitioning can occur without interrupting communication between the transceivers in order to retrain the transceivers. One of the transceivers transmits a message the other transceiver that specifies the second application profile and requests a transition to that second application profile. In one embodiment, the transceiver transmitting the request receives an inverted sync symbol from the other transceiver to synchronize use of the second application profile.

Description

    RELATED APPLICATIONS
  • [0001]
    This application is a continuation-in-part of co-pending U.S. patent application Ser. No. 09/522,869, filed on Mar. 10, 2000, which claims the benefit of and priority to U.S. provisional application Serial No. 60/124,222, filed Mar. 12, 1999, entitled “Seamless Rate Adaptive (SRA) ADSL System”, U.S. provisional application Serial No. 60/161,115, filed Oct. 22, 1999, entitled “Multicarrier System with Stored Application Profiles”, and U.S. provisional application Serial No. 60/177,081, filed Jan. 19, 2000, entitled “Seamless Rate Adaptive (SRA) Multicarrier Modulation System and Protocols. This application also claims the benefit of and priority to U.S. provisional application Serial No. 60/154,116, filed Sep. 15, 1999, entitled “Transceiver Supporting Multiple Applications”, U.S. provisional application Serial No. 60/161,115, filed Oct. 22, 1999, entitled “Multicarrier System with Stored Application Profiles”, and U.S. provisional application Serial No. 60/177,081, filed Jan. 19, 2000, entitled “Seamless Rate Adaptive (SRA) Multicarrier Modulation System and Protocols, which co-pending provisional applications are incorporated-herein by reference in their entirety.
  • FIELD OF THE INVENTION
  • [0002]
    This invention relates to transmission systems using multicarrier modulation. More particularly, the invention relates to multicarrier transmission systems that support multiple applications.
  • BACKGROUND
  • [0003]
    In a conventional multicarrier transmission system, transceivers communicate over a communication channel using multicarrier modulation or Discrete Multitone Modulation (DMT). Carriers or subchannels spaced within a usable frequency band of the communication channel are modulated at a symbol transmission rate of the system. In ADSL (Asynchronous Digital Subscriber Line) systems, the symbol rate is approximately 4 kHz. Every 250 microseconds, the transmitting transceiver allocates a new set of bits for transmission to the subchannels so that the bit error rates of the subchannels are substantially equal at the receiving transceiver. Consequently, for a given symbol period the numbers of bits may vary from subchannel to subchannel.
  • [0004]
    ITU (International Telecommunication Union) standards G.992.1 and G.992.2 specify parameters that characterize the operation of ADSL DMT transceivers. Examples of parameters, to name but a few, include the data rate (b/s) for the connection between the transceivers, the number of subchannels in the upstream and downstream directions, and the number of bits allocated to each subchannel. In general, such parameters remain fixed after the initial configuration and installation of the transceiver. Some parameters depend on the data rate of the connection and may change when the ADSL connection is at a high or low data rate. Some parameters may change when channel conditions change. However, after the type of application is determined, i.e., voice, data, video, etc., the parameters are optimized and fixed for that application.
  • [0005]
    For splitterless operation, described in the ITU Q.922.2 standard, ADSL transceivers store “channel profiles,” which include a subset of parameters that are used when conditions of the communication channel change (e.g., a telephone goes off the hook). When the channel conditions change because of an event that the ADSL transceiver does not control (e.g., a telephone connected to the same wire as the ADSL transceiver goes off hook), the ADSL transceiver must identify the new channel condition, retrain some of the receiver functions (e.g., equalizers, echo cancellers, etc.), and switch to the channel profile that is used for the new channel condition. This process, defined as a “Fast Retrain” procedure in ITU G.922.2, takes approximately 1-2 seconds. These channel profiles, however, depend solely on the channel condition and not on the application(s) executing on the ADSL connection.
  • [0006]
    As technological advances increase the data rate throughput for multicarrier transmission systems, ADSL transceivers are becoming capable of supporting multiple applications. To support multiple applications, it is necessary that the ADSL transceiver be able to quickly and efficiently adapt the transmission parameters as the number and type of active applications change over time. For example if the ADSL transceiver is accessing data over the Internet when a voice telephone call that is being transported over the ADSL connection becomes active, the ADSL transceiver must be able to modify the transmission parameters to accommodate both active applications. As other voice telephone calls and different applications (e.g., video on demand, video conferencing) become activated and deactivated over the ADSL connection, the ADSL transceiver must also be able to support the various transmission requirements of the various combinations of concurrently active applications. For example, video signals have higher reliability but lesser transmission delay requirements than voice and data signals. For some transmission systems, it has been necessary to find a compromise between high reliability and transmission delay.
  • [0007]
    Thus, there remains a need for a system and method that can support the various transmission requirements of multiple active applications as the number and type of active applications change over time.
  • SUMMARY OF THE INVENTION
  • [0008]
    One objective is to provide a DMT transceiver that can support multiple applications and quickly and efficiently modify transmission parameters over time as applications are activated and deactivated. In one aspect of the invention, a multicarrier modulation system has two transceivers in communication with each other over a communication channel. In one aspect of the invention, a multicarrier modulation system has two transceivers in communication with each other over a communication channel. The invention features a method for supporting a plurality of applications. A plurality of application profiles is defined. Each application profile corresponds to a unique set of one or more applications and specifies at least one transmission parameter for each application in that unique application set for transmitting information associated with that application over the communication channel.
  • [0009]
    The plurality of application profiles is stored at one of the transceivers. Information is transmitted according to a first stored application profile that corresponds to a set of currently active applications. A second stored application profile is selected in response to a change in the set of currently active applications. This second application profile corresponds to the one or more applications in the changed set of currently active applications. The transmission of information transitions to the use of the second stored application profile, without interrupting communication between the transceivers in order to retrain the transceivers.
  • [0010]
    A message is transmitted to one of the transceivers, identifying the second application profile as the application profile to use for subsequent communications between the transceivers. The message can operate to request a transition to the second application profile. Either a receiver or a transmitter of a transceiver can send the message to initiate the transition.
  • [0011]
    A reply message is received from the transceiver to which the message was transmitted. When the receiver sent the initial message, the reply message grants the request and synchronizes use of the second application profile. In one embodiment, an inverted sync symbol is used for the reply message. When the transition is transmitter-initiated, the reply message grants the request to transition to the second application profile. Then, another message is sent, acknowledging the grant and synchronizing use of the second application profile. In one embodiment, this other message is an inverted sync symbol.
  • [0012]
    Each application profile can be transmitted to the other transceiver over the communication channel with or without performing a full initialization of the transceivers. Application profiles can be generated upon an initial occurrence of a unique set of active applications, and associated with that unique application set. In one embodiment, each of the transceivers locally generates at least one of the transmission parameters for one of the stored application profiles using a predefined process employed by both transceivers. In other embodiments, transceivers can be preconfigured with the stored application profiles.
  • [0013]
    In an application profile, the transmission parameters specified for each application includes at least one of: a transmission data rate, subchannels allocated for downstream and upstream transmission, a number of bits allocated to each of the subchannels, performance margin, fine gain adjustments for each of the subchannels, interleave depth, a minimum and a maximum QAM constellation size, a length of a cyclic prefix, a codeword size, a framing mode, and trellis code.
  • [0014]
    In another aspect, the invention features a method for supporting multiple applications that are active between the transceivers. A plurality of application profiles is developed for characterizing transmission of information over the communication channel. Each application profile is associated with a unique set of one or more applications that may become active between the transceivers. The application profiles are stored at the transceivers. Information is transmitted over the communication channel according to a first stored application profile that corresponds to a set of currently active applications. A second one of the application profiles that corresponds to the changed set of currently active applications is retrieved in response to a change in the set of currently active applications that are active between the transceivers. The transceivers transition to transmitting information over the communication channel according to the second application profile. The transitioning can occur with or without retraining the transceivers.
  • [0015]
    In still another aspect, the invention features a method for supporting a plurality of applications in which a plurality of application profiles are defined. Each application profile corresponds to a unique set of one or more applications and specifies at least one transmission parameter for each application in that unique application set for transmitting information associated with that application over the communication channel. The plurality of application profiles is stored at one of the transceivers.
  • [0016]
    In yet another aspect of the invention, a multicarrier modulation system has a transceiver communicating over a communication channel. A plurality of application profiles is defined. Each application profile corresponds to a unique set of one or more applications and specifies at least one transmission parameter for each application in that unique application set for transmitting information associated with that application over the communication channel.
  • [0017]
    The plurality of application profiles is stored at the transceiver. Information is transmitted according to a first stored application profile that corresponds to a set of currently active applications. A second stored application profile is selected in response to a change in the set of currently active applications. This second application profile corresponds to the one or more applications in the changed set of currently active applications. The transmission of information transitions to the use of the second stored application profile, without having to retrain the transceiver. The transceiver can transmit or receive a message that identifies the second application profile as the application profile to use for subsequent communications.
  • [0018]
    In still another aspect of the invention, each application profile corresponds to a unique set of one or more applications and specifies at least one reception parameter for each application in that unique application set, for receiving information associated with that application over the communication channel. The reception of information transitions from using the first stored application profile to use of the second stored application profile without having to retrain the transceiver. Again, the transceiver can transmit or receive a message that identifies the second application profile as the application profile to use for subsequent communications.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0019]
    The invention is pointed out with particularity in the appended claims. The advantages of the invention described above, as well as further advantages of the invention, may be better understood by reference to the following description taken in conjunction with the accompanying drawings, in which:
  • [0020]
    [0020]FIG. 1 is a block diagram of an embodiment of a digital subscriber line multicarrier transmission system including a remote DMT (discrete multitone modulation) transceiver in communication with a central office transceiver and supporting multiple applications using application profiles in accordance with the principles of the invention;
  • [0021]
    [0021]FIG. 2 is a block diagram of an embodiment of a transmitter of the remote DMT transceiver having two latency paths for supporting multiple applications with different latency requirements;
  • [0022]
    [0022]FIG. 3 is a flow diagram of an embodiment of a process for initially exchanging and storing the application profiles at the central office and the remote DMT transceivers;
  • [0023]
    [0023]FIG. 4 is a flow diagram of an embodiment of a receiver-initiated process used by the remote DMT transceiver and the CO transceiver to transition to a stored application profile; and
  • [0024]
    [0024]FIG. 5 is a flow diagram of an embodiment of a transmitter-initiated process used by the remote DMT transceiver and the CO transceiver to transition to a stored application profile.
  • DESCRIPTION OF THE INVENTION
  • [0025]
    [0025]FIG. 1 shows an asymmetric DSL transmission system 2 including a remote discrete multitone modulation (DMT) transceiver 10 (e.g., a modem) in communication with a central office (CO) transceiver 14 over a communication channel 18. The remote DMT transceiver 10 includes a transmitter 22, a receiver 26, and memory 30 storing a plurality of application profiles (AP) 34 in accordance with the principles of the invention. The CO transceiver 14 includes a transmitter 38, a receiver 42, and memory 46 storing a plurality of application profiles 50 that have a one-to-one correspondence with the application profiles 34 of the remote DMT transceiver 10.
  • [0026]
    The communication channel 18 in one embodiment is a pair of twisted wires of a telephone subscriber line. The communication channel 18 provides an upstream transmission path from the transmitter 22 of the remote DMT transceiver 10 to the receiver 42 of the CO transceiver 14, and a downstream transmission path from the transmitter 38 of the CO transceiver 14 to the receiver 26 of the remote DMT transceiver 10. The system 2 is asymmetric in that the bandwidth of the downstream transmission path is greater than the bandwidth of the upstream transmission path.
  • [0027]
    The remote DMT transceiver 10 and the CO transceiver 14 receive and transmit application streams 54, 54′ (generally 54) using the application profiles 34, 50 in accordance with the principles of the invention. Each application stream 54 (hereafter, referred to as an application 54) conveys one type of signal (e.g., digital data, voice, video, etc.). For example, a stream of voice signals is one application, a stream of digital data signals is another application, and a stream of video signals is yet another application. Voice applications correspond to one or more active voice telephone calls. An example of a digital data application are Internet access Web browsing (IAWB), and an example of a video application is video-on demand. The ADSL system 2 may also transmit applications 54 comprised of other signal types. Although shown as separate applications streams, the application streams can arrive at the transceiver 10, 14 as part of a single stream of transmission packets (e.g., ATM cells) having the various types of signals.
  • [0028]
    The ADSL system 2 supports multiple active applications 54 concurrently. For example, the transmitter 22 of the remote DMT transceiver 10 can concurrently transmit signals of a voice application and signals of a digital data application to the receiver 42 of the CO transceiver 14 over the upstream transmission path of the communication channel 18. As another example, FIG. 1 shows the ADSL system 2 concurrently transmitting signals associated with digital data, voice, and video applications 54 over the upstream and downstream transmission paths.
  • [0029]
    At any given point in time, the DSL system 2 has zero, one, or more applications 54 that are currently active. Each unique combination of one or more active applications, hereafter referred to as a set of applications or application set, represents an unique active communication state of the transceivers 10, 14. Examples of application sets 54 include: two or more concurrently active applications of different types (e.g., an Internet access Web browsing application together with a voice telephony application comprised of one or more voice telephone calls). Other examples of sets of active applications have only one active application (e.g., an Internet access Web browsing application, or one or more active voice telephone calls).
  • [0030]
    Each application 54 falls into one of two categories of applications: (1) fixed data rate applications, and (2) variable data rate applications. Fixed data rate applications require a specific bandwidth, and must obtain that bandwidth in order to pass over the communication channel 18. If the required data rate is presently unavailable, then the application is not presently supported. An example of a fixed data rate application is a voice telephony application that requires 64 kb/s for each active telephone call. Some video applications may also require a specific fixed data rate. Variable data rate applications can operate over a range of data rates (e.g., 1 Mb/s to 2 Mb/s). Thus, if the available channel bandwidth falls into this range, the application is supportable. An example of a variable data rate application is a digital data application (e.g., Internet access Web browsing). Some video applications are other examples of variable data rate applications that can operate within a data rate range.
  • [0031]
    Such data rate requirements determine, in part, the content of the application profiles 34, 50, as described in more detail below. In general, application profiles 34, 50 that support one or more fixed data rate applications specify the specific data rate requirement for each such fixed data rate application. Application profiles 34, 50 that support variable data rate applications specify up to the maximum amount of available data rate that falls within the range of the particular variable data rate applications. Application profiles 34, 50 that support both fixed data rate and variable data rate applications first allot the specific data rate requirements to the specific fixed data rate application(s) and then allot the remaining available bandwidth to the variable data rate application(s).
  • [0032]
    Different types of applications 54 typically also have different transmission and reception requirements for reliability and transmission delay. More specifically, the requirements for data rate, latency, burst or impulse noise, bit error rate (BER), and data rate symmetry can vary significantly for different applications. For example, high-speed video applications are asymmetric, requiring a high downstream data rate, e.g., 1.5 Mb/s to 6 Mb/s, and a low upstream data rate,. e.g., 16 kb/s to 64 kb/s. In addition, because video signals are highly compressed when transmitted, video applications have low immunity to impulse noise. Consequently, video applications require a low BER of <1E-9. A high latency of >20 ms is acceptable.
  • [0033]
    In contrast, digital data applications, such as Web browsing over the Internet, are less asymmetric that video applications, using downstream data rates ranging between 32 kb/s to 6 Mb/s and upstream data rates between 32 kb/s to 1 Mb/s. Bit error rate requirements for digital data applications are <1E-7, generally being immune to impulse noise more than video applications. Also, a moderate latency of <5 ms is generally acceptable.
  • [0034]
    Voice applications (i.e., telephone calls) are symmetric, requiring a 64 kb/s data rate in both the upstream and downstream transmission paths. Having a high immunity to impulse noise, voice applications can have a BER of <1E-3. In contrast to video and digital data applications, a low latency of approximately less than 1.5 ms is required.
  • [0035]
    Other types of applications may have other requirements.
  • [0036]
    Various digital multitone transmission (or reception) parameters control these requirements. For example, bit allocation tables (BAT) control the data rate and the bit error rate. Reed-Solomon (R/S) coding controls and interleaving provides a lower bit error rate; both increase immunity to impulse noise at the expense of increased latency. The number of tones used in the upstream and downstream paths determines data rate symmetry. Consequently, a variety of parameters characterize the DMT transmission and reception of signals associated with a given application 54 over the communication channel 18. (Hereafter, such parameters are referred to generally as transmission parameters although such parameters are also used in the reception of signals.) Such transmission parameters include:
  • [0037]
    the data rate (in bits/second) for the given application (upstream and/or downstream) between the transceivers 10, 14;
  • [0038]
    the subchannels allocated in the upstream and downstream transmission paths for the given application;
  • [0039]
    the number of bits allocated to each subchannel for the given application;
  • [0040]
    the minimum and maximum quadrature amplitude modulation (QAM) constellation size used on each subchannel for the given application;
  • [0041]
    the inclusion or exclusion of a trellis code for the given application;
  • [0042]
    the length of the cyclic prefix for the given application;
  • [0043]
    coding parameters (e.g., R/S codeword size) for the given application;
  • [0044]
    the interleaver depth, if an interleaver is used for the given application;
  • [0045]
    the framing mode (e.g., the ITU ADSL transmission standards G.922.1 specify four different framing modes) for the given application;
  • [0046]
    the fine gain adjustments made to each tone for the given application; and
  • [0047]
    the performance margin for the given application.
  • [0048]
    To transmit and receive signals associated with one or more active applications, the remote DMT transceiver 10 and the CO transceiver 14 use the application profiles 34, 50 to characterize such communications. More specifically, each application profile 34, 50 is a parameter set that specifies the transmission parameters for a unique set of one or more presently active applications 54. Application profiles corresponding to application sets that represent only one active application specify the transmission parameters for that one application. As described below, the values assigned to the parameters of each application profile 34, 50 depend upon the category and type of each application in the application set corresponding to that application profile.
  • [0049]
    For application sets that represent two or more concurrently active applications, the corresponding application profile 34, 50 specifies transmission parameters that concurrently accommodate every active application in that application set. In effect, the application profile 34, 50 operates to combine the individual transmission (or reception) requirements of the individual applications 54 into a single transmission parameter set that achieves concurrent transmission of every active application.
  • [0050]
    For example, assume that the total data rate of a connection is 1.532 Mb/s. When a variable data rate application (e.g., a digital data application) is running alone, it uses the fill available data rate of 1.532 Mb/s, presuming that this data rate is within the range of data rates for the variable data rate application. Thus, one embodiment of the application profile, corresponding to this variable data rate application, allots the full available data rate of the connection to the variable data rate application. When a-fixed data rate application (e.g., voice application) is running alone, it uses the specifically required data rate (e.g., a 64 kb/s data rate for a voice application). Thus, one embodiment of the application profile, corresponding to this fixed data rate application, allots the specifically required data rate to the fixed data rate application.
  • [0051]
    When the above-described fixed and variable data rate applications run concurrently, the application profile corresponding to this set of two applications provides first for the data rate requirements of the fixed data rate application and then for the variable data rate application using the channel bandwidth that remains after satisfying the fixed data rate application. Thus, if the fixed data rate application is a voice application requiring 64 Kb/s, the application profile specifies the required 64 Kb/s for the voice application and allots the remaining channel bandwidth of 1.468 Mb/s data rate to the variable data rate application. As another example, if the fixed data rate application is a voice application comprised of two voice calls, each requiring 64 Kb/s, the application profile specifies the required 128 Kb/s for the voice application and gives the remaining channel bandwidth of 1.404 Mb/s data rate to the variable data rate application. In these examples, it is presumed that the reduced bandwidth for the variable data rate application (i.e., from 1.532 Mb/s to 1.468 Mb/s or 1.404 Mb/s) falls within the range of acceptable data rates of the variable data rate application. In effect, the parameters associated with transmitting and receiving signals for each of the active applications individually are combined within the application profile in a manner that achieves the simultaneous transmission and reception of signals for all of the concurrently active applications.
  • [0052]
    Although shown above to specify the data rate for particular applications, each application profile 34, 50 may specify one or any combination of the parameters described above and other unlisted parameters for characterizing the DMT transmission (and reception) of signals associated with each application in that application profile. For example, other transmission parameters that the application profile 34, 50 can specify are the number of latency paths required to support the applications in the application profile, and the data rate of each latency path.
  • [0053]
    As another example, application profiles can also specify the allocation of subchannels to applications. For example, assume that when a variable data rate application is running alone, the corresponding application profile allocates every available subchannel to carry bits associated with the variable data rate application. Further assume that when a fixed data rate application is running alone, the corresponding application profile allocates a subset of the available subchannels sufficient to achieve the specifically required data rate (e.g., a 64 kb/s data rate for a voice application) of the fixed data rate application. When these fixed and variable data rate applications run concurrently, the application profile corresponding to this set of two applications specifies the allocation of some subchannels to the fixed data rate application, and other subchannels to the variable data rate application. Possibly, one or more of the subchannels are allocated to both the fixed and variable data rate applications.
  • [0054]
    Application profiles are further illustrated by the following five examples of application profiles, AP #1-AP #5, which can be developed and stored at the transceivers 10, 14. These exemplary profiles specify the transmission characteristics for five different communication states involving two types of applications, a fixed data rate voice application comprised of one or more voice calls and a variable data rate Internet access Web browsing (IAWB) application. For these examples, assume that the total data rate of the connection (e.g., upstream) between the transceiver 10, 14 is 1.532 Mb/s, and that the IAWB application has a minimum and maximum data rate range of 1 Mb/s to 2 Mb/s. Each voice call of the voice application requires 64 kp/s. In general, the fixed data rate applications receive the data rate that each requires, and the variable data rate receives the balance of the bandwidth capacity of the connection.
  • [0055]
    Application Profile #1.
  • [0056]
    Application profile #1 (hereafter, also AP #1) corresponds to an application set of only one variable data rate application, the IAWB application with the data rate range of 1 Mb/s and 2 Mb/s. Thus, AP #1 specifies the full connection capacity (here, 1.532 Mb/s) for transmitting signals associated with the IAWB application. All useable subchannels are allocated to the IAWB data stream with a 1E-7 BER on each subchannel. An R-S codeword size is 200 bytes with interleaver depth of 5 codewords.
  • [0057]
    Application Profile #2
  • [0058]
    Application profile #2 (hereafter, also AP #2) corresponds to an application set of only one fixed data rate application, a voice telephone (VT) application requiring 64 kb/s. Thus, AP #2 specifies 64 kp/s for transmitting signals associated with the VT application. A subset of the subchannels sufficient to achieve 64 kb/s is allocated to the VT data stream with a 1E-3 BER on each subchannel. There is no coding or interleaving.
  • [0059]
    Application Profile #3
  • [0060]
    Application profile #3 (hereafter, also AP #3) corresponds to an application set of only one fixed data rate application, specifically, one voice application comprised of two voice telephone (VT) calls on separate voice channels, each call requiring 64 kb/s. Accordingly, AP #3 specifies a data rate of 128 kb/s (i.e., 2×64 kb/s) for transmitting signals associated with this VT application. A subset of the subchannels sufficient to achieve 128 kb/s is allocated to the VT data stream with a 1E-3 BER on each subchannel. Again, there is no coding or interleaving.
  • [0061]
    Application Profile #4
  • [0062]
    Application profile #4 (hereafter, also AP #4) corresponds to-an application set of two applications of different types, specifically, the variable data rate IAWB application and one fixed data rate VT application. For transmitting signals associated with the IAWB and VT applications, AP #4 specifies the data rate for the VT stream as 64 kb/s and for the IAWB stream as 1.468 Mb/s (1532 kb/s-64 kb/s). A subset of the subchannels sufficient to achieve 64 kb/s is allocated to the VT stream with a 1E-3 BER on each subchannel so allocated. A subset of the subchannels sufficient to achieve 1.468 Mb/s is allocated to the IAWB stream with 1E-7 BER on each subchannel so allocated. For the IAWB stream, there is an R-S codeword size of 200 bytes with an interleaver depth of 5 codewords; for the VT stream, there is no coding or interleaving.
  • [0063]
    Application Profile #5
  • [0064]
    Application profile #5 (hereafter, also AP #5) corresponds to an application set of two applications; the variable data rate IAWB application and one fixed data rate VT application comprised of two voice telephone calls on separate channels, each call requiring 64 kb/s. For transmitting signals associated with the IAWB and the VT applications, AP #5 allots a 128 kb/s data rate for the VT stream and a 1.404 Mb/s (1532 kb/s-128 kb/s) data rate for the IAWB stream. A subset of the subchannels sufficient to achieve 128 kb/s is allocated to the VT data stream with a 1E-3 BER on each subchannel so allocated. A subset of the subchannels sufficient to achieve 1.404 Mb/s is allocated to the IAWB stream with 1E-7 BER on each subchannel so allocated. For the IAWB stream, there is an R-S codeword size of 200 bytes with an interleaver depth of 5 codewords; again, for the VT stream, there is no coding or interleaving.
  • [0065]
    As applications 54 become active and inactive over time, the remote DMT transceiver 10 and the CO transceiver 14 use the stored application profiles 34, 50 to change the transmission parameters quickly and efficiently and thereby accommodate the transmission requirements of the currently active application(s). Whenever a change occurs to the set of currently active applications, the remote DMT transceiver 10 and CO transceiver 14 select the appropriate application profile from the stored set of profiles 34, 50. In one embodiment, if an application profile does not yet exist for the current set of active applications, one of the transceivers 10, 14 generates the appropriate application profile and exchanges that new application profile with the other transceiver over the communication channel 18. In other embodiments the transceivers 10, 14 can be configured with predefined application profiles and/or dynamically generate application profiles during the operation of the ADSL system 2 as the need for such profiles arises. In another embodiment, the transmission parameters in the application profiles are exchanged during initialization. In yet another embodiment, transmission parameters in the application profiles are mutually generated by each transceiver 10, 14 locally.
  • [0066]
    [0066]FIG. 2 shows an exemplary embodiment of the transmitter 22 of the remote DMT transceiver 10 including two latency paths 56, 58 for supporting multiple applications 54 with different latency requirements. The transmitter 38 of the CO transceiver 14 comprises equivalent paths and functions as the transmitter 22. The receivers 26, 42 also comprise equivalent latency paths, but in reverse order and performing inverse operations than those of the transmitters 22, 38 to demodulate the information received over the communication channel 18.
  • [0067]
    The multiple latency paths 56, 58 are used to send different application bit seams with different latency requirements through the ADSL DMT transceiver 10. In FIG. 2, two different applications 54″, 54′″ are shown. One exemplary application 54″ is a digital data stream (e.g., and ATM (asynchronous transfer mode) data stream) and the other exemplary application is a voice telephony application. It is to be understood that additional and/or different applications can be used, and that the use of the digital data and voice telephony applications is merely illustrative of the principles of the invention. The digital data application 54″ can tolerate a moderate amount of latency (i.e., less than approximately 5 ms) and is sent through the latency path 56, which has interleaving. The voice telephony application 54′″ with low latency requirements is sent through the other latency path 58, which has no interleaving.
  • [0068]
    The transmitter 22 can have additional and/or different latency paths. For example, in one embodiment, the ADSL system 2 has a video application in addition to the digital data and voice telephony applications. This video application can tolerate a higher latency that the moderate latency of the ATM data application 54″ and the low latency of the voice telephony application 54′″. For this embodiment, the ADSL system 2 can accommodate the latency requirements of the video application by providing a third, different latency path.
  • [0069]
    Each latency path 56, 58 includes three blocks: a MUX block 60, a framer/coder/interleaver (FCI) block layer 64, 64′, and a modulator block 68. The MUX block 60 has multiple inputs for receiving the signal streams of the active applications 54 and an output for each latency path 56, 58. The MUX block 60 directs the signal stream of the digital data application 54″ to the first latency path 56 and the signal stream of the voice data application 54′″ to the second latency path 58.
  • [0070]
    Each FCI block 64, 64′ (generally 64) provides functionality associated with preparing a stream of bits for modulation, transforming the received signals into frames and superframes, adding overhead channel (i.e., AOC and EOC) information the frames, and if applicable, coding and interleaving. The operations performed by each FCI block 64 depends upon the type of application 54″, 54′″ and the latency path 56, 58 taken by that application.
  • [0071]
    On the first latency path 56, the FCI block 64 includes a framer block 72, a cyclic redundancy check (CRC) and scrambler (SCR) block 76, a forward error correction (FEC) block 80 (e.g., R-S Coding), and an interleaving (INT) block 84. On the second latency path 58, the FCI block 64′ includes a framer block 76′ and a CRC and SCR block 80′. The second latency path 58 through the FCI block 64′ has a different (i.e., lesser) amount of latency than the first path 56 because the second path 58 does not perform interleaving or coding on the voice stream.
  • [0072]
    The modulator block 68 provides functionality associated with DMT modulation and includes a quadrature amplitude modulation (QAM) encoder 88 and an inverse Fast Fourier transform (IFFT) 92. The QAM encoder 88 has multiple inputs to receive and combine the signal streams from the latency paths 56, 58 into a single signal stream that is sent to the IFFT 92 for modulation. The IFFT 92 modulates bits received from the QAM encoder 88 into the multicarrier subchannels of the communication channel 18.
  • [0073]
    Also shown in FIG. 2 are the five exemplary application profiles, AP #1-AP #5, which are described in FIG. 1. Application profiles #1, #4, and #5 are in communication with the FCI block 64 of the first latency path 54 because each of these profiles specifies one or more transmission parameters that characterizes the ATM data stream. Application profiles #2, #3, #4, and #5 are in communication with the FCI block 64′ of the second latency path 58 because each of these profiles specifies one or more transmission parameters that characterize the voice stream. In one embodiment, all five of the application profiles, AP #1-AP #5, are in communication with the Modulator block 68 because each profile specifies one or more transmission parameters that characterize the allocation of bits to subchannels of the communication channel 18.
  • [0074]
    Storing and Exchanging Application Profiles
  • [0075]
    Predefined Profiles
  • [0076]
    Before the transceivers 10, 14 can communicate over the communication channel 18 using an application profile to characterize such communications, that application profile is stored in the appropriate local memory 30, 46. In one embodiment, each transceiver 10, 14 is preconfigured (e.g., factory set); that is, the application profile is already stored in the local memory 30, 46 before the transceivers 10, 14 are incorporated into the ADSL system 2.
  • [0077]
    Profiles Exchanged and Stored Upon First Occurrence of an Application Set
  • [0078]
    In another embodiment, the transceivers 10, 14 exchange the application profile over the communication channel 18 and then store the application profile. FIG. 3 shows an embodiment of a process used to accomplish the profile exchange. For the purpose of illustrating the process, assume that the remote DMT and CO transceivers 10, 14 are exchanging signals associated with an Internet access Web browsing (IAWB) application according to the AP #1 of FIG. 1, when a new voice application becomes activated, resulting in the need of a new application profile. In general, either the remote DMT transceiver 10 or the CO transceiver 14 can act as the initiator of an exchange of the new application profile. More specifically, either the transmitter 22 or the receiver 26 of the remote DMT transceiver 10, or the transmitter 38 or the receiver 42 of the CO transceiver 14 can initiate the new application profile exchange.
  • [0079]
    During the exchange of IAWB signals, the activation of the new voice application 54 is detected (step 100). Either transceiver 10, 14 or other component of the DSL system 2 (e.g., a computer system within which the transceiver 10, 14 operates) may make this detection. Upon the detection of this new voice application 54, a determination is made (step 104) as to whether an application profile for the combination of the active IAWB application and the new voice application already exists. Again, the transceiver 10, 14 or another component of the DSL system 2 may make this determination. When such an application profile does not exist, transmission parameters are determined (step 108) that accommodate the concurrent transmission of signals associated with the IAWB application and the new voice application. Note that the deactivation of an active application can also result in a unique set, of currently active applications for which-there does not presently exist an application profile. In such an event, transmission parameters are likewise determined (step 108) for transmitting signals associated with the one or more applications that are currently active after the deactivation.
  • [0080]
    These transmission parameters represent a new application profile. One embodiment of this new application profile can be application profile #4 (AP #4), as described above FIG. 1, because AP #4 supports one IAWB application and one voice application. An identifier is associated with the new application profile. For example, if at the time of activation of this new application there are already three stored application profiles, the new application profile becomes the fourth. Because of the one-to-one correspondences between application profiles at the CO transceiver 14 as those at the remote DMT transceiver 10, the same identifier is to be used by the remote DMT 10 and CO transceivers 14 to identify the new application profile.
  • [0081]
    One of the transceivers 10, 14 then exchanges the new application profile with the other transceiver 14, 10, sending (step 112) the transmission parameters associated with the new application profile over the communication channel 18 using the AOC or EOC channel. In one embodiment; transmission of this new application profile operates as a message requesting use of the new application profile.
  • [0082]
    Profiles Exchanged and Stored During Full Initialization
  • [0083]
    In another embodiment, the transceivers 10, 14 exchange the new application-profile with each other using the ITU compliant “Full Initialization” protocol of the G.992.2 or G.992.1 ITU standards, or a similar initialization protocol that interrupts the application data communication between the transceivers 10, 14 in order to train and exchange transmission information between transceivers. Use of the Full Initialization protocol causes approximately a 10-second drop in the link. This 10-second interruption occurs only once, upon the first occurrence of a unique set of currently active applications for which a new application profile is exchanged and subsequently stored. In another embodiment, upon initialization the transceivers 10, 14 negotiate the application to be supported and exchange profiles corresponding to all possible combinations of active applications.
  • [0084]
    After the application profile is exchanged, the transceivers 10, 14 store (steps 116) the application profile in local memory, 30, 46. Consequently, when a new voice application is activated while the transceivers 10, 14 are communicating according to AP #1 (FIG. 1), the transition to the stored AP #4 (FIG. 1) occurs quickly, as described in more detail below, because the exchange of the application profile over the communication channel 18 is not performed; the exchange is unnecessary.
  • [0085]
    Locally Generating Parameters in an Application Profile
  • [0086]
    In the exchange of the new application profile between transceivers 10, 14, the transceivers 10, 14 do not need to exchange every transmission parameter of the new application profile over the communication channel 18. In one embodiment, the each transceiver 10, 14 can locally develop one or more transmission parameters (e.g., the allocation of subchannels to applications) and store the locally developed parameter in the appropriate application profile. The local development of such transmission parameters can occur when initially developing or updating an application profile.
  • [0087]
    For example, assume that the transceivers 10, 14 are running two applications: a digital data application and a voice application. The transceivers 10, 14 exchange information with each other indicating that the connection supports these two applications. Based on the exchange of this information, each transceiver 10, 14 locally generates one or more transmission parameters for the application profile that corresponds to the two applications. Because both transceivers 10, 14 mutually generate these transmission parameters, the transceivers 10, 14 do not exchange the locally-generated transmission parameters with each other over the communication channel 18. Other transmission parameters,.such as those associated with framing, coding, and interleaving, are still determined in the information exchange between the transceivers 10, 14.
  • [0088]
    Mutually generating transmission parameters has the advantage of reducing or eliminating lengthy exchange messages when initially developing or updating an application, profile. For example, if changes in channel conditions result in a decrease in the total data rate of the channel 18, resulting in a lower bit capacity for some of the subchannels, then typically, the transceivers 10, 14 would need to exchange updates with each other for all application profiles that specify those affected subchannels. By mutually generating transmission parameters in the application profiles, the transceivers 10, 14 can each locally update the application profiles without having to exchange the update information with each other.
  • [0089]
    The following three examples illustrate the use of mutually generated parameters as applied to the allocation of subchannels to two applications, here a digital data application and a voice application. Each example shows an application profile that specifies the allocation subchannels to the applications as a transmission parameter: (1) one application profile for when the digital data application runs alone, (2) another for when the voice application runs alone, and (3) another for when the digital data and voice applications run concurrently.
  • [0090]
    For the first application profile, the transceivers 10, 14 each locally allocate all of the available data rate and useable subchannels to the digital data application after establishing the connection. Other transmission parameters that are not mutually generated by the transceivers 10, 14, e.g., those parameters associated with framing, coding, and interleaving, are determined in the information exchange between the transceivers 10, 14.
  • [0091]
    For the second application profile, the transceivers 10, 14 allocate 64 kb/s to the voice application, regardless of the data rate capability of the connection. Each transceiver 10, 14 uses a predetermined technique (e.g., specified by a standard) to select the subchannels that are allocated to carry the 64 kb/s of the voice application. Examples of schemes that iterate through the available subchannels to select subchannels for the voice application include: (1) ascending from a subchannel with the lowest frequency to subchannels with higher frequencies; (2) descending from an available subchannel with the highest frequency to subchannels of lower frequencies; (3) ascending from a subchannel with the least number of bits to subchannels with higher numbers of bits; and (4) descending from a subchannel with the most number of bits to subchannels with lesser numbers of bits. Again, the transceivers 10, 14 can frame, code, and interleave in a predefined manner or as determined during the exchange during initialization.
  • [0092]
    For the third application profile, each transceiver 10, 14 allocates 64 kb/s to the voice application and the remaining data rate to the digital data application. Similar to the second application profile, each transceiver 10, 14 uses a predetermined technique for choosing the subchannels that are allocated to carry the voice application (e.g., subchannels of the highest or lowest frequency or of the smallest or largest constellations). Also, framing, coding, and interleaving are predefined or determined during the exchange as described above.
  • [0093]
    The transceivers 10, 14 use a coordinated numbering scheme for the locally generated application profiles (e.g., #6=digital data application only, #7=voice application only, #8=digital data and voice applications together). The numbering scheme can be predefined or the transceivers 10, 14 can exchange the numbering scheme over the communication channel 18.
  • [0094]
    The principles of the invention extend to embodiments with more than the two applications. For such embodiments, to generate corresponding application profiles for each of the possible active applications, individually and in combination, the transceivers 10, 14 follow prescribed rules for selecting the application profile transmission parameters and their corresponding parameter values.
  • [0095]
    Fast Transitioning to a Stored Application Profile
  • [0096]
    Throughout the operation of the DSL system 2, applications may be activated and de-activated over time. This change in the active applications (i.e., via the activation or deactivation of an application) is known by the transceiver 10 (or receiver) and therefore does not need to be identified with a Fast Retrain as specified in the ITU G.922.1 and G.922.2 standards. Since the application profile is being changed because of a change in the active applications, and not because of a change in the channel conditions, there is no requirement to retrain retriever functions, such as echo cancellars, equalizers, etc., as is done in a Fast Retrain.
  • [0097]
    Storing application profiles for subsequent use shortens the handshake between the transceivers 10, 14, used by the transceivers 10, 14 to transition to another application profile because the transceivers do not have to undergo the process of creating, exchanging, and storing a new application profile.
  • [0098]
    The remote DMT transceiver 10 or the CO transceiver 14, and either the receiver or the transmitter of that transceiver 10, 14 can initiate the transition. Stored application profiles are identified so that the transmitter and the receiver simply notify the other as to which profile is to be used. The information associated with the application profile does not have to be transmitted again. In one embodiment, the stored application profiles are numbered. Accordingly, one transceiver simply specifies the number of the desired application profile to the other transceiver.
  • [0099]
    Receiver-Initiated Fast Application Profile Transition
  • [0100]
    [0100]FIG. 4 shows an embodiment of a receiver-initiated process used by the remote DMT transceiver 10 and the CO transceiver 14 to transition to a stored application profile. Although the process is shown from the perspective of the receiver 26 of the remote DMT transceiver 10, it is to be understood that the receiver 42 of the CO transceiver 14 can also initiate the transition. In one embodiment, a change in the set of currently active applications occurs (step 140), requiring a transition to another application profile. The change may be the result of an application that has been activated or deactivated, or of an existing application that requires additional bandwidth (e.g., a second voice channel opens for a voice application that previously had only one voice channel).
  • [0101]
    After the change in the active applications, the receiver 26 determines (step 142) which application profile corresponds to the current set of active applications. The receiver 26 sends (step 148) a message to the transmitter 38 using the AOC or EOC channel specifying the stored application profile that is to be used for transmission based on this current set of active applications. This message corresponds to a request by the receiver 26. For example, if the transceivers 10, 14 are communicating according to AP #1 (FIG. 1) when a voice telephone call is activated, the receiver 26 sends the request to the transmitter 38 requesting a transition to AP #4 (FIG. 1). In one embodiment, the request identifies the AP #4 by the numeral 4.
  • [0102]
    After receiving the request, the transmitter 38 sends (step 152) an inverted sync symbol as a flag to signal the receiver 26 that the requested stored application profile is about to be used for transmission and to synchronize its use. The transmitter 38 uses (step 154) its stored copy of the specified application profile for transmission on-the first frame, or on a predetermined number of frames, following the inverted sync symbol. This inverted sync signal corresponds to a “Go” message sent by the transmitter 38. The receiver 26 detects (step 156) the inverted sync symbol and, in synchronization with the transmitter 38, uses the specified application profile upon the first frame, or the predetermined number of frames, received after the inverted sync symbol.
  • [0103]
    The inverted sync symbol is a sync symbol in which the phase information in the QAM signal is shifted by 180 degrees. Phase shifts of the sync symbol other than 180 degrees can also be used for the “Go” message. The sync symbol is defined in the ANSI and ITU standards as a fixed non-data carrying DMT symbol that is transmitted every 69 symbols. The sync symbol is constructed by modulating all the DMT carriers with a predefined pseudo-random number sequence using basic QPSK (2 bit QAM) modulation. This sync symbol signal, which is used throughout the transceiver initialization process, has special autocorrelation properties that make possible the detection of the sync symbol and the inverted sync symbol even in highly noisy environments.
  • [0104]
    Because of its near invulnerability to channel noise, use of the inverted sync symbol to synchronize use of the new application profile by the transceivers 10,14 is more robust than using the EOC or AOC channel. In contrast, messages sent over the EOC or AOC channel can be more easily corrupted by noise on the communication channel 18 than the inverted sync symbol. These overhead channels are multiplexed into the data stream at the framer 72 and therefore are, transmitted with quadrature amplitude modulation over a finite number of DMT subchannels. Impulse noise or other noise occurring on the communication channel 18 can cause bit errors in the EOC or AOC channel message, causing the message to be lost. Notwithstanding this sensitivity of the EOC or AOC channel to noise, which is greater than that of the inverted sync symbol, in one embodiment the EOC or AOC channel is used to communicate the “Go” message.
  • [0105]
    Receiver-initiated transitioning to a stored application profile completes quickly, requiring the exchange of only two messages (the request and the “Go” message) because the appropriate application profile is stored and does not need to be exchanged. Again, use of the inverted sync symbol as the “Go” message makes the synchronization between the transceivers 10, 14 robust in noisy environments.
  • [0106]
    Transmitter-Initiated Fast Application Profile Transition
  • [0107]
    [0107]FIG. 5 shows an embodiment of a transmitter-initiated process used by the remote DMT transceiver 10 and the CO transceiver 14 to transition to a stored application profile. Although the process is shown from the perspective of the transmitter 22 of the remote DMT transceiver 10, it is to be understood that the transmitter 38 of the CO transceiver 14 can also initiate the transition. As before, a change in the set of currently active applications occurs (step 160), requiring a transition to another application profile. Again, the change may be the result of an application that has been activated or deactivated, or of an existing application that requires additional bandwidth (e.g., a second voice channel opens for a voice application that previously had only one voice channel).
  • [0108]
    After the change in active applications the transmitter 22 determines (step 162) which application profile corresponds to the current set of applications. The transmitter 22 sends (step 168) a message to the receiver 42 using the AOC or EOC channel specifying the stored application profile that is to be used for transmission based on the current set of active applications. The message can identify the appropriate stored application profile by number or by any other identification uniquely associated with that stored application profile. This message corresponds to a request by the transmitter 22. After receiving the request, the receiver 42 returns (step 172) a “grant” or “deny” message to the transmitter 22.
  • [0109]
    If the transmitter 22 receives the “grant” message, the transmitter 22 sends (step 176) an inverted sync symbol as a flag to signal the receiver 42 that the requested stored application profile will be used for transmission. The transmitter 22 then uses (step 178) its stored copy of the specified application profile for transmission on the first frame, or a predetermined number of flames, following the inverted sync symbol. The inverted sync signal corresponds to a “Go” message sent by the transmitter 22. The receiver 42 detects (step 180) the inverted sync symbol (“Go”) and starts communicating using the specified application profile for reception on the first frame, or a predetermined number of frames, following the inverted sync symbol in synchronization with the transmitter 22.
  • [0110]
    Transmitter-initiated transitions to a stored application profile completes quickly, requiring the exchange of three messages (the request, the deny or grant message, and the Go message) when transmitter-initiated, because the appropriate application profile is stored and does not need to be exchanged. Again, use of the inverted sync symbol as the “Go” message makes the synchronization between the transceivers 10, 14 robust in noisy environments.
  • [0111]
    In another embodiment, the transceivers 10, 14 transition to a stored application profile using the “Fast Retrain” protocol described in the ITU G.922.2 specification, or a similar fast initialization protocol that interrupts the application data communication between the transceivers 10, 14 in order to train and exchange transmission information between transceivers. The Fast Retrain causes a 1 to 2 second disconnection between the transceivers 10, 14.
  • [0112]
    Updating Application Profiles
  • [0113]
    Under certain circumstances, the contents of a stored application profile 34 (and the corresponding application profile 50) may require updating. For example, communication channel 18 conditions can change, (e.g., a telephone goes off the hook), which result in an increase or decrease in the data rate capabilities of the channel 18 and a different bit capacity of certain subchannels of the channel 18. The transceivers 10, 14 then need to update all stored application profiles that specify the bit capacity of the affected subchannels. In one embodiment, each transceiver 10, 14 locally updates its own stored copy of the affected application profile without exchanging the update information with each other. In another embodiment, the transceivers 10, 14 exchange the update information with each other.
  • [0114]
    While the invention has been shown and described with reference to specific preferred embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the following claims. For example, although the invention is described with respect to DMT modulation, the principles of the invention also apply to DWMT (Discrete Wavelet Multitone) modulation. Also, IP frames instead of ATM packets can be used to transport data. Further, although the specification uses ADSL to describe the invention, it is to be understood that any form of DSL can be used, i.e., VDSL, SDSL, HDSL, HDSL2, or SHDSL. The principles of the invention also apply to any DMT communication system that supports multiple sets of applications, where the applications are activated and de-activated over time. Although several embodiments described above included Internet and voice applications, it is also to be understood that the principles of the invention apply to any combination of applications transported over DSL systems (e.g., telecommuting, video conferencing, high speed Internet access, video-on demand).

Claims (26)

  1. 1. In multicarrier modulation communications including two transceivers in communication with each other over a communication channel, a system configurable to support a plurality of applications comprising:
    means for defining a plurality of application profiles, each application profile corresponding to a unique set of one or more applications and specifying at least one transmission parameter for each application in that unique application set for transmitting information associated with that application over the communication channel;
    means for storing the plurality of application profiles at one of the transceivers;
    means for transmitting information according to a first stored application profile that corresponds to a set of currently active applications;
    means for selecting, in response to a change in the set of currently active applications, a second stored application profile that corresponds to the one or more applications in the changed set of currently active applications; and
    means for transitioning to transmitting information according to the second stored application profile, without interrupting communication between the transceivers in order to retrain the transceivers.
  2. 2. The system of claim 1, further comprising means for receiving a message that identifies the second application profile as the application profile to use for subsequent communications.
  3. 3. The system of claim 1, further comprising means for transmitting a message to one of the transceivers that identifies the second application profile as the application profile to use for subsequent communications between the transceivers.
  4. 4. The system of claim 1, further comprising means for transmitting a message to one of the transceivers requesting a transition to the second application profile.
  5. 5. The system of claim 4, further comprising means for receiving a reply message from that one transceiver, and means for granting the request to transition to the second application profile.
  6. 6. The system of claim 5, further comprising means for sending another message to that one transceiver, and means for acknowledging the grant and synchronizing use of the second application profile.
  7. 7. The system of claim 5, wherein the other message is an inverted sync symbol.
  8. 8. The system of claim 4, further comprising means for receiving a reply message from that one transceiver, and means for granting the request and synchronizing use of the second application profile.
  9. 9. The system of claim 8, wherein the reply message is an inverted sync symbol.
  10. 10. The system of claim 1, further comprising means for transmitting at least one of the application profiles to the other transceiver over the communication channel without performing a full initialization of the transceivers.
  11. 11. The system of claim 1, further comprising means for performing a full initialization of the transceivers to exchange one of the application profiles between the transceivers.
  12. 12. The system of claim 1, further comprising means for generating one of the application profiles upon an initial occurrence of a unique set of active applications, and means for associating the generated application profile with that unique application set.
  13. 13. The system of claim 1, further comprising means for locally generating, by each of the transceivers, at least one of the transmission parameters for one of the stored application profiles.
  14. 14. The system of claim 1, wherein the transceivers are preconfigured with the stored application profiles.
  15. 15. The system of claim 1, wherein the at least one transmission parameter specified for each application in one of the stored application profiles is at least one of a transmission data rate, subchannels allocated for downstream and upstream transmission, a number of bits allocated to each of the subchannels, performance margin, fine gain adjustments for each of the subchannels, interleave depth, a minimum and a maximum QAM constellation size, a length of a cyclic prefix, a codeword size, a framing mode, and trellis code.
  16. 16. The system of claim 1, wherein the first stored application profile characterizes a transmission of signals associated with a Web browsing application, and the second stored application profile characterizes concurrent transmission of signals associated with a voice telephony application and the Web browsing application.
  17. 17. In multicarrier modulation communications, a system including transceivers in communication with each other over a communication channel configurable to support multiple applications that are active between the transceivers comprising:
    means for developing a plurality of application profiles for characterizing transmission of information over the communication channel;
    means for associating each application profile with a unique set of one or more applications that may become active between the transceivers;
    means for storing the application profiles at the transceivers;
    means for transmitting information over the communication channel according to a first stored application profile that corresponds to a set of currently active applications;
    retrieving, in response to a change in the set of currently active applications that are active between the transceivers, a second one of the application profiles that corresponds to the changed set of currently active applications; and
    means for transitioning to transmitting information over the communication channel according to the second application profile.
  18. 18. The system of claim 17, wherein the transitioning occurs without interrupting communication between the transceivers in order to retrain the transceivers.
  19. 19. The system of claim 17, wherein the means for transitioning includes means for retraining the transceivers to communicate according to the second stored application profile.
  20. 20. In multicarrier modulation communications including transceivers in communication with each other over a communication channel, a system configurable to support a plurality of applications comprising:
    means for defining a plurality of application profiles, each application profile corresponding to a unique set of one or more applications and specifying at least one transmission parameter for each application in that unique application set for transmitting information associated with that application over the communication channel; and
    means for storing the plurality of application profiles at one of the transceivers.
  21. 21. In multicarrier modulation communications including a transceiver communicating over a communication channel, a system configurable to support a plurality of applications comprising:
    means for defining a plurality of application profiles, each application profile corresponding to a unique set of one or more applications and specifying at least one transmission parameter for each application in that unique application set for transmitting information associated with that application over the communication channel;
    means for storing the plurality of application profiles at the transceiver;
    means for transmitting information according to a first stored application profile that corresponds to a set of currently active applications;
    means for selecting, in response to a change in the set of currently active applications, a second stored application profile that corresponds to the changed set of currently active applications; and
    means for transitioning to transmitting information according to the second stored application profile without having to retrain the transceiver.
  22. 22. The system of claim 21, further comprising means for transmitting a message that identifies the second application profile as the application profile to use for subsequent communications.
  23. 23. The system of claim 21, further comprising means for receiving a message that identifies the second application profile as the application profile to use for subsequent communications.
  24. 24. In multicarrier modulation communications including a transceiver communicating over a communication channel, a system configurable to support a plurality of applications comprising:
    means for defining a plurality of application profiles, each application profile corresponding to a unique set of one or more applications and specifying at least one reception parameter for each application in that unique application set for receiving information associated with that application over the communication channel;
    means for storing the plurality of application profiles at the transceiver;
    receiving information according to a first stored application profile that corresponds to a set of currently active applications;
    means for selecting, in response to a change in the set of currently active applications, a second stored application profile that corresponds to the changed set of currently active applications; and
    means for transitioning to transmitting information according to the second stored application profile without having to retrain the transceiver.
  25. 25. The system of claim 24, further comprising means for transmitting a message that identifies the second application profile as the application profile to use for subsequent communications.
  26. 26. The system of claim 24, further comprising means for receiving a message that identifies the second application profile as the application profile to use for subsequent communications.
US10863247 1999-03-12 2004-06-09 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications Abandoned US20040223511A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US12422299 true 1999-03-12 1999-03-12
US15411699 true 1999-09-15 1999-09-15
US16111599 true 1999-10-22 1999-10-22
US17708100 true 2000-01-19 2000-01-19
US09522869 US6498808B1 (en) 1999-03-12 2000-03-10 Seamless rate adaptive multicarrier modulation system and protocols
US09663758 US6778596B1 (en) 1999-03-12 2000-09-15 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US10863247 US20040223511A1 (en) 1999-03-12 2004-06-09 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US10863247 US20040223511A1 (en) 1999-03-12 2004-06-09 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US12044498 US7813419B2 (en) 1999-03-12 2008-03-07 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US12879907 US8351491B2 (en) 1999-03-12 2010-09-10 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US13708801 US8934555B2 (en) 1999-03-12 2012-12-07 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US14565404 US9369404B2 (en) 1999-03-12 2014-12-09 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US15181356 US20170041245A1 (en) 1999-03-12 2016-06-13 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09663758 Continuation US6778596B1 (en) 1999-03-12 2000-09-15 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12044498 Continuation US7813419B2 (en) 1999-03-12 2008-03-07 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

Publications (1)

Publication Number Publication Date
US20040223511A1 true true US20040223511A1 (en) 2004-11-11

Family

ID=32831181

Family Applications (11)

Application Number Title Priority Date Filing Date
US09663001 Active 2022-08-28 US6775320B1 (en) 1999-03-12 2000-09-15 Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US09663758 Active 2022-08-30 US6778596B1 (en) 1999-03-12 2000-09-15 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US10863247 Abandoned US20040223511A1 (en) 1999-03-12 2004-06-09 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US10863246 Abandoned US20040223510A1 (en) 1999-03-12 2004-06-09 Method and multi-carrier transceiver supporting dynamic switching between active application sets
US12013043 Active US7813418B2 (en) 1999-03-12 2008-01-11 Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US12044498 Active US7813419B2 (en) 1999-03-12 2008-03-07 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US12859086 Active US8045603B2 (en) 1999-03-12 2010-08-18 Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US12879907 Active 2020-03-12 US8351491B2 (en) 1999-03-12 2010-09-10 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US13708801 Active US8934555B2 (en) 1999-03-12 2012-12-07 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US14565404 Active US9369404B2 (en) 1999-03-12 2014-12-09 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US15181356 Pending US20170041245A1 (en) 1999-03-12 2016-06-13 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US09663001 Active 2022-08-28 US6775320B1 (en) 1999-03-12 2000-09-15 Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US09663758 Active 2022-08-30 US6778596B1 (en) 1999-03-12 2000-09-15 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

Family Applications After (8)

Application Number Title Priority Date Filing Date
US10863246 Abandoned US20040223510A1 (en) 1999-03-12 2004-06-09 Method and multi-carrier transceiver supporting dynamic switching between active application sets
US12013043 Active US7813418B2 (en) 1999-03-12 2008-01-11 Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US12044498 Active US7813419B2 (en) 1999-03-12 2008-03-07 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US12859086 Active US8045603B2 (en) 1999-03-12 2010-08-18 Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US12879907 Active 2020-03-12 US8351491B2 (en) 1999-03-12 2010-09-10 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US13708801 Active US8934555B2 (en) 1999-03-12 2012-12-07 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US14565404 Active US9369404B2 (en) 1999-03-12 2014-12-09 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US15181356 Pending US20170041245A1 (en) 1999-03-12 2016-06-13 Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

Country Status (1)

Country Link
US (11) US6775320B1 (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050053229A1 (en) * 2003-09-08 2005-03-10 Tsatsanis Michail Konstantinos Common mode noise cancellation
US20050053097A1 (en) * 2003-09-08 2005-03-10 Djokovic Igor Shen Multi-channel communication system for multiple input, multiple output processing of an encoded signal
US20050180354A1 (en) * 2003-11-25 2005-08-18 Samsung Electronics Co., Ltd. Method for allocating subchannels in an OFDMA mobile communication system
US20060029148A1 (en) * 2004-08-06 2006-02-09 Tsatsanis Michail K Method and apparatus for training using variable transmit signal power levels
US20060029147A1 (en) * 2004-08-06 2006-02-09 Tsatsanis Michail K Method and apparatus for training using variable transmit signal power levels
US20060176942A1 (en) * 2005-02-07 2006-08-10 Vladimir Oksman On-line reconfiguration and synchronization protocol for multi-carrier DSL
US20070061557A1 (en) * 2005-09-15 2007-03-15 Shauh Jack S Techniques for managing applications in a portable communication device
US20070133705A1 (en) * 1999-03-12 2007-06-14 Aware, Inc. Method for synchronizing seamless rate adaptation
US20080037666A1 (en) * 1999-03-12 2008-02-14 Aware, Inc. Method for seamlessly changing power modes in an adsl system
US20080089433A1 (en) * 2006-10-13 2008-04-17 Jun Hyok Cho Method and apparatus for adapting to dynamic channel conditions in a multi-channel communication system
EP1936855A1 (en) * 2006-12-21 2008-06-25 Alcatel Lucent Method and apparatus for configuring data paths over a multi-carrier signal
US20080198909A1 (en) * 2003-09-08 2008-08-21 Michail Konstantinos Tsatsanis Efficient multiple input multiple output signal processing method and apparatus
US20080212660A1 (en) * 1999-03-12 2008-09-04 Aware, Inc. Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US20080215650A1 (en) * 2007-01-25 2008-09-04 Michail Konstantinos Tsatsanis Efficient multiple input multiple output signal processing method and apparatus
DE102008005290A1 (en) * 2008-01-19 2009-07-23 T-Mobile Internationale Ag DSL process variable upload / download bit rate and application-specific, dynamic profile switching
US20100070950A1 (en) * 2008-09-18 2010-03-18 Jeffrey John Smith Apparatus and methods for workflow capture and display
US20100080167A1 (en) * 2005-06-28 2010-04-01 Koninklijke Philips Electronics, N.V. Handshaking method and apparatus for ofdm systems with unknown sub-channel availability
WO2012058170A1 (en) * 2010-10-26 2012-05-03 Qualcomm Incorporated Application specific resource management

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040044942A1 (en) * 1999-03-12 2004-03-04 Aware, Inc. Method for seamlessly changing power modes in an ADSL system
DE60100733D1 (en) * 2000-04-23 2003-10-16 Coppergate Comm Ltd ADSL system for voice and data transmission
GB0014325D0 (en) * 2000-06-12 2000-08-02 Koninkl Philips Electronics Nv Computer profile update system
US6947748B2 (en) 2000-12-15 2005-09-20 Adaptix, Inc. OFDMA with adaptive subcarrier-cluster configuration and selective loading
US7187712B2 (en) * 2001-04-02 2007-03-06 Texas Instruments Incorporated Efficient framing of overhead channel for ADSL modems
US7349691B2 (en) * 2001-07-03 2008-03-25 Microsoft Corporation System and apparatus for performing broadcast and localcast communications
US20030039317A1 (en) * 2001-08-21 2003-02-27 Taylor Douglas Hamilton Method and apparatus for constructing a sub-carrier map
US7336680B2 (en) * 2001-09-18 2008-02-26 Scientific-Atlanta, Inc. Multi-carrier frequency-division multiplexing (FDM) architecture for high speed digital service
US20030053493A1 (en) * 2001-09-18 2003-03-20 Joseph Graham Mobley Allocation of bit streams for communication over-multi-carrier frequency-division multiplexing (FDM)
US7590145B2 (en) * 2002-09-17 2009-09-15 Scientific-Atlanta, Inc. Multiplexing octets from a data flow over MPEG packets
EP2506508A3 (en) 2001-10-05 2012-10-17 Aware, Inc. Systems and methods for multi-pair ATM over DSL
US8543681B2 (en) * 2001-10-15 2013-09-24 Volli Polymer Gmbh Llc Network topology discovery systems and methods
US8868715B2 (en) 2001-10-15 2014-10-21 Volli Polymer Gmbh Llc Report generation and visualization systems and methods and their use in testing frameworks for determining suitability of a network for target applications
WO2003040736A1 (en) * 2001-11-07 2003-05-15 Aware, Inc. Modeling and calibrating a three-port time-domain reflectometry system
US20030187520A1 (en) * 2002-02-25 2003-10-02 General Electric Company Method and apparatus for circuit breaker node software architecture
US7697431B1 (en) * 2003-04-25 2010-04-13 Cisco Technology, Inc. Managing the bandwidths of virtual circuits when the aggregate bandwidth to an adjacent device changes
ES2220208A1 (en) * 2003-05-06 2004-12-01 Diseño De Sistemas En Silicio, S.A. Spectral configurability procedure for signals modulated by orthogonal frequency division multiplexing (OFDM) for mains.
US7496144B2 (en) * 2004-03-05 2009-02-24 Infineon Technologies Ag Allocating data between tones in a VDSL system
US20050227683A1 (en) * 2004-03-22 2005-10-13 Motorola, Inc. Apparatus and method for over the air software repair
WO2006044227A1 (en) 2004-10-12 2006-04-27 Aware, Inc. Resource sharing in a telecommunications environment
US7573851B2 (en) 2004-12-07 2009-08-11 Adaptix, Inc. Method and system for switching antenna and channel assignments in broadband wireless networks
JP4463133B2 (en) * 2005-03-25 2010-05-12 Necインフロンティア株式会社 Key telephone system and voice communication channel control method
US7664091B2 (en) * 2005-10-03 2010-02-16 Motorola, Inc. Method and apparatus for control channel transmission and reception
CN100542198C (en) * 2006-01-11 2009-09-16 华为技术有限公司 Discrete multi-audio frequency modulation data transmitting method and system
US8611300B2 (en) * 2006-01-18 2013-12-17 Motorola Mobility Llc Method and apparatus for conveying control channel information in OFDMA system
EP2173071B1 (en) 2006-04-12 2013-06-26 TQ Delta, LLC Packet retransmission and memory sharing
US8155580B2 (en) * 2006-06-23 2012-04-10 Qualcomm Incorporated Methods and apparatus for efficient data distribution to a group of users
US20080123755A1 (en) * 2006-09-18 2008-05-29 Axel Clausen Method and apparatus for data transmission
US7970990B2 (en) * 2006-09-22 2011-06-28 Oracle America, Inc. Memory module with optical interconnect that enables scalable high-bandwidth memory access
EP2210191A1 (en) * 2007-11-15 2010-07-28 Sk Telecom Co., LTD System and method for producing importance rate-based rich media, and server applied to the same
US8817907B2 (en) * 2008-03-26 2014-08-26 Ikanos Communications, Inc. Systems and methods for signaling for vectoring of DSL systems
US8300518B2 (en) * 2008-04-01 2012-10-30 Alcatel Lucent Fast seamless joining of channels in a multi-channel communication system
JP5196181B2 (en) * 2008-04-14 2013-05-15 株式会社リコー The image processing system and a storage medium
CN101741606B (en) * 2008-11-24 2011-12-28 中兴通讯股份有限公司 vdsl2 configuration management model based on real business scenarios
US8693419B2 (en) * 2010-07-12 2014-04-08 Entropic Communications, Inc. Method and apparatus for using dynamic subchannels in a communications network
US9900064B2 (en) 2012-10-03 2018-02-20 Sckipio Technologies S.I Ltd Hybrid precoder
CN104125580A (en) * 2013-04-23 2014-10-29 中国移动通信集团浙江有限公司 Network planning method and apparatus
CN103888403B (en) * 2014-04-03 2017-12-12 深圳市金频科技有限公司 One suitable high rate of 5g network wavelet multi-carrier spread spectrum communications systems and methods
FR3033109B1 (en) * 2015-02-19 2017-02-24 Commissariat Energie Atomique Method of transmitting a frequency plan in a telecommunication system

Citations (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573380A (en) * 1969-05-15 1971-04-06 Bell Telephone Labor Inc Single-sideband modulation system
US4131766A (en) * 1977-07-11 1978-12-26 Granger Associates Digital filter bank
US4568156A (en) * 1984-11-07 1986-02-04 Dane John A Tracking apparatus for parabolic reflectors
US4679227A (en) * 1985-05-20 1987-07-07 Telebit Corporation Ensemble modem structure for imperfect transmission media
US4802190A (en) * 1987-01-26 1989-01-31 U.S. Philips Corporation Method of transmitting information by means of code signals, information transmission system for carrying out the method, and transmitting and receiving apparatus for use in the transmission system
US4912763A (en) * 1986-10-30 1990-03-27 International Business Machines Corporation Process for multirate encoding signals and device for implementing said process
US5048054A (en) * 1989-05-12 1991-09-10 Codex Corporation Line probing modem
US5128964A (en) * 1990-10-10 1992-07-07 Intelligent Modem Corporation Modulation method and apparatus for multicarrier data transmission
US5206886A (en) * 1990-04-16 1993-04-27 Telebit Corporation Method and apparatus for correcting for clock and carrier frequency offset, and phase jitter in mulicarrier modems
US5285474A (en) * 1992-06-12 1994-02-08 The Board Of Trustees Of The Leland Stanford, Junior University Method for equalizing a multicarrier signal in a multicarrier communication system
US5327574A (en) * 1990-02-23 1994-07-05 Mitsubishi Denki Kabushiki Kaisha Mobile communication system
US5400322A (en) * 1993-08-20 1995-03-21 Amati Communications Corp. Updating of bit allocations in a multicarrier modulation transmission system
US5428790A (en) * 1989-06-30 1995-06-27 Fujitsu Personal Systems, Inc. Computer power management system
US5452288A (en) * 1992-04-08 1995-09-19 France Telecom Method for the transmission of digital data in radio paging systems and corresponding radio paging receiver
US5479447A (en) * 1993-05-03 1995-12-26 The Board Of Trustees Of The Leland Stanford, Junior University Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines
US5497398A (en) * 1993-08-12 1996-03-05 Aware, Inc. Multi-carrier transceiver
US5521906A (en) * 1995-01-26 1996-05-28 Motorola Inc. Method and apparatus for updating carrier channel allocations
US5533008A (en) * 1995-01-26 1996-07-02 Motorola, Inc. Method and apparatus for providing a communication system infrastructure
US5555244A (en) * 1994-05-19 1996-09-10 Integrated Network Corporation Scalable multimedia network
US5596604A (en) * 1993-08-17 1997-01-21 Amati Communications Corporation Multicarrier modulation transmission system with variable delay
US5598435A (en) * 1993-12-23 1997-01-28 British Telecommunications Public Limited Company Digital modulation using QAM with multiple signal point constellations not equal to a power of two
US5625651A (en) * 1994-06-02 1997-04-29 Amati Communications, Inc. Discrete multi-tone data transmission system using an overhead bus for synchronizing multiple remote units
US5636246A (en) * 1994-11-16 1997-06-03 Aware, Inc. Multicarrier transmission system
US5644573A (en) * 1995-01-20 1997-07-01 Amati Communications Corporation Methods for coordinating upstream discrete multi-tone data transmissions
US5682419A (en) * 1995-01-26 1997-10-28 Grube; Gary W. Method and apparatus for providing infrastructure call support
US5812599A (en) * 1995-07-11 1998-09-22 Alcatel N.V. Method for allocating data elements in multicarrier applications and equipment to perform this method
US5822374A (en) * 1996-06-07 1998-10-13 Motorola, Inc. Method for fine gains adjustment in an ADSL communications system
US5822372A (en) * 1996-08-02 1998-10-13 Motorola, Inc. Multicarrier system using subchannel characteristics to implement different error rates within a data stream
US5910959A (en) * 1997-01-06 1999-06-08 Conexant Systems, Inc. Control channel for modems
US6009122A (en) * 1997-05-12 1999-12-28 Amati Communciations Corporation Method and apparatus for superframe bit allocation
US6011814A (en) * 1997-09-30 2000-01-04 Paradyne Corporation Adaptive comb filter and decision feedback equalizer for noise suppression
US6052411A (en) * 1998-04-06 2000-04-18 3Com Corporation Idle mode for digital subscriber line
US6072779A (en) * 1997-06-12 2000-06-06 Aware, Inc. Adaptive allocation for variable bandwidth multicarrier communication
US6084917A (en) * 1997-12-16 2000-07-04 Integrated Telecom Express Circuit for configuring and dynamically adapting data and energy parameters in a multi-channel communications system
US6188729B1 (en) * 1993-04-01 2001-02-13 Scientific-Atlanta, Inc. Method and apparatus for effecting seamless data rate changes in a video compression system
US6480475B1 (en) * 1998-03-06 2002-11-12 Texas Instruments Incorporated Method and system for accomodating a wide range of user data rates in a multicarrier data transmission system
US6665872B1 (en) * 1999-01-06 2003-12-16 Sarnoff Corporation Latency-based statistical multiplexing

Family Cites Families (67)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577380A (en) * 1968-06-28 1971-05-04 Gen Motors Corp Cross-linked carboxylated elastomers
US5252288A (en) * 1986-06-17 1993-10-12 Sumitomo Electric Industries, Inc. Method for producing an elongated sintered article
US4922537A (en) * 1987-06-02 1990-05-01 Frederiksen & Shu Laboratories, Inc. Method and apparatus employing audio frequency offset extraction and floating-point conversion for digitally encoding and decoding high-fidelity audio signals
JP2761281B2 (en) * 1990-05-17 1998-06-04 富士通株式会社 Encryption communication method of a multi-carrier communication system
JPH0494140A (en) 1990-08-10 1992-03-26 Nippon Telegr & Teleph Corp <Ntt> Small-sized part holding mechanism
US5224152A (en) 1990-08-27 1993-06-29 Audiovox Corporation Power saving arrangement and method in portable cellular telephone system
US5247347A (en) * 1991-09-27 1993-09-21 Bell Atlantic Network Services, Inc. Pstn architecture for video-on-demand services
JPH0724966B2 (en) 1991-12-16 1995-03-22 東京都 Perforating apparatus tubular liner
JPH05316111A (en) 1992-05-11 1993-11-26 N T T Data Tsushin Kk Network monitor system
JPH05327796A (en) 1992-05-19 1993-12-10 N T T Data Tsushin Kk Carrier control system for multi-carrier modem
FR2692372B1 (en) 1992-06-12 1994-07-29 Buffet Alain Spectacle frame for filter glasses.
WO1994001964A1 (en) * 1992-07-08 1994-01-20 Bell Atlantic Network Services, Inc. Media server for supplying video and multi-media data over the public telephone switched network
US5612599A (en) * 1994-04-25 1997-03-18 Ricoh Company, Ltd. DC brushless motor driving device, DC brushless motor, and image forming device using the driving device and brushless motor
JP2821979B2 (en) * 1993-09-13 1998-11-05 富士通株式会社 Control system of the ring configuration network
US5708659A (en) 1993-10-20 1998-01-13 Lsi Logic Corporation Method for hashing in a packet network switching system
GB9322999D0 (en) 1993-11-08 1994-01-05 Foley John P Terrestrial television standards converter
JPH07183862A (en) 1993-12-22 1995-07-21 Toshiba Corp Error correcting method of frequency division multiplexing transmission and transmission system using same
DE69433357T2 (en) 1994-09-12 2004-09-09 Aventis Pharma Deutschland Gmbh Recombinant Mersacidin and process for its preparation
US5719883A (en) 1994-09-21 1998-02-17 Lucent Technologies Inc. Adaptive ARQ/FEC technique for multitone transmission
US5819184A (en) * 1995-06-07 1998-10-06 Pacific Communication Sciences, Inc. Portable communications and data terminal operating to optimize receipt of both incoming CDPD and AMPS messages
EP0753948B1 (en) 1995-07-11 2006-06-07 Alcatel Capacity allocation for OFDM
JP2802255B2 (en) 1995-09-06 1998-09-24 株式会社次世代デジタルテレビジョン放送システム研究所 Orthogonal frequency division multiplexing transmission method and a transmission apparatus and a receiving apparatus using the same
US5757813A (en) 1995-10-18 1998-05-26 Telefonaktiebolaget Lm Ericsson Method for achieving optimal channel coding in a communication system
JP3192358B2 (en) 1995-10-24 2001-07-23 富士通株式会社 Service variable device in the information center
JPH09171902A (en) 1995-12-20 1997-06-30 Amp Japan Ltd Position sensor
JP2000509214A (en) 1996-03-27 2000-07-18 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Point - to-multipoint radio transmission system
JP2968717B2 (en) 1996-04-25 1999-11-02 日本電気株式会社 Time-division multiplexing transmission apparatus
EP0820168A3 (en) 1996-07-19 2000-04-12 Texas Instruments Incorporated Multimode modem, and protocols therefor
US5852633A (en) 1996-06-07 1998-12-22 Motorola, Inc. Method for allocating data in a data communication system
US6055297A (en) 1996-08-02 2000-04-25 Northern Telecom Limited Reducing crosstalk between communications systems
FI101845B1 (en) 1996-08-09 1998-08-31 Nokia Telecommunications Oy Method for determining the quality of the connection, and receiver
EP0922341B1 (en) 1996-09-02 2002-11-13 STMicroelectronics N.V. Improvements in, or relating to, multi-carrier transmission systems
EP0828363A3 (en) 1996-09-04 2000-04-05 Texas Instruments Incorporated Multicode modem with a plurality of analogue front ends
US5737337A (en) * 1996-09-30 1998-04-07 Motorola, Inc. Method and apparatus for interleaving data in an asymmetric digital subscriber line (ADSL) transmitter
US5909463A (en) 1996-11-04 1999-06-01 Motorola, Inc. Single-chip software configurable transceiver for asymmetric communication system
US5831690A (en) * 1996-12-06 1998-11-03 Rca Thomson Licensing Corporation Apparatus for formatting a packetized digital datastream suitable for conveying television information
CA2272576A1 (en) 1996-12-17 1998-06-25 Thomas Bingel Apparatus and method for communicating voice and data between a customer premises and a central office
JP3117415B2 (en) 1997-03-04 2000-12-11 日本電気株式会社 Diversity reception system and the transmission device, the receiving device
US6175550B1 (en) 1997-04-01 2001-01-16 Lucent Technologies, Inc. Orthogonal frequency division multiplexing system with dynamically scalable operating parameters and method thereof
US6064692A (en) 1997-06-20 2000-05-16 Amati Communications Corporation Protocol for transceiver initialization
US6005893A (en) 1997-09-23 1999-12-21 Telefonaktiebolaget Lm Ericsson Reduced complexity bit allocation to subchannels in a multi-carrier, high speed data transmission system
US6130882A (en) 1997-09-25 2000-10-10 Motorola, Inc. Method and apparatus for configuring a communication system
GB9721075D0 (en) 1997-10-03 1997-12-03 Cancer Res Campaign Tech Materials and methods relating to the stimulation of cells
US6101216A (en) 1997-10-03 2000-08-08 Rockwell International Corporation Splitterless digital subscriber line communication system
US6266348B1 (en) 1997-10-10 2001-07-24 Aware, Inc. Splitterless multicarrier modem
WO1999020027B1 (en) 1997-10-10 1999-10-14 Aware Inc Splitterless multicarrier modem
JP3176576B2 (en) 1997-10-21 2001-06-18 三菱電機株式会社 Data communication equipment
US6122247A (en) * 1997-11-24 2000-09-19 Motorola Inc. Method for reallocating data in a discrete multi-tone communication system
US6091713A (en) 1998-04-13 2000-07-18 Telcordia Technologies, Inc. Method and system for estimating the ability of a subscriber loop to support broadband services
US6449288B1 (en) 1998-05-09 2002-09-10 Centillium Communications, Inc. Bi-level framing structure for improved efficiency DSL over noisy lines
US6219377B1 (en) * 1998-06-29 2001-04-17 Legerity, Inc. Method and apparatus for generating tones in a multi-tone modem
WO2000002335A3 (en) 1998-07-06 2000-02-24 Roman Vitenberg Source adaptive digital subscriber line and method
US6272170B1 (en) 1998-07-09 2001-08-07 Conexant Systems, Inc. Method and apparatus for reducing start-up latency in a data transmission system
US6337877B1 (en) * 1998-08-27 2002-01-08 Legerity, Inc. Method and apparatus for scaling modem transfer capacity in a multi-channel communications system
US6426961B1 (en) 1998-09-02 2002-07-30 Bellsouth Intellectual Property Corporation Method and system for selection of mode of operation of a service in light of use of another service in an ADSL system
JP3152217B2 (en) 1998-10-09 2001-04-03 日本電気株式会社 Wire transmission device and a wired transmission method
JP3161426B2 (en) 1998-10-09 2001-04-25 日本電気株式会社 Wire transmission device and a wired transmission method
US6665672B2 (en) * 1998-10-30 2003-12-16 Xerox Corporation Transaction/object accounting method and system
US6754241B1 (en) * 1999-01-06 2004-06-22 Sarnoff Corporation Computer system for statistical multiplexing of bitstreams
JP3743742B2 (en) 1999-02-01 2006-02-08 株式会社日立国際電気 Data transmission system
US20060274840A1 (en) 2005-06-06 2006-12-07 Marcos Tzannes Method for seamlessly changing power modes in an ADSL system
US20040044942A1 (en) 1999-03-12 2004-03-04 Aware, Inc. Method for seamlessly changing power modes in an ADSL system
EP1956785B1 (en) * 1999-03-12 2012-12-26 Daphimo Co. B.V., LLC Multicarrier modulation system and method
US6775320B1 (en) * 1999-03-12 2004-08-10 Aware, Inc. Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US6647117B1 (en) 1999-08-16 2003-11-11 Nortel Networks Limited Continuity of voice carried over DSL during power failure
WO2001084796A3 (en) 2000-05-01 2002-04-11 Centillium Communications Inc Framing technique for adsl systems
US6885696B2 (en) 2000-07-28 2005-04-26 Nortel Networks Limited Notifying bit allocation changes in a multicarrier modulation communications system

Patent Citations (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573380A (en) * 1969-05-15 1971-04-06 Bell Telephone Labor Inc Single-sideband modulation system
US4131766A (en) * 1977-07-11 1978-12-26 Granger Associates Digital filter bank
US4568156A (en) * 1984-11-07 1986-02-04 Dane John A Tracking apparatus for parabolic reflectors
US4679227A (en) * 1985-05-20 1987-07-07 Telebit Corporation Ensemble modem structure for imperfect transmission media
US4731816A (en) * 1985-05-20 1988-03-15 Telebit Corporation Ensemble modem structure for imperfect transmission media
US4912763A (en) * 1986-10-30 1990-03-27 International Business Machines Corporation Process for multirate encoding signals and device for implementing said process
US4802190A (en) * 1987-01-26 1989-01-31 U.S. Philips Corporation Method of transmitting information by means of code signals, information transmission system for carrying out the method, and transmitting and receiving apparatus for use in the transmission system
US5048054A (en) * 1989-05-12 1991-09-10 Codex Corporation Line probing modem
US5428790A (en) * 1989-06-30 1995-06-27 Fujitsu Personal Systems, Inc. Computer power management system
US5327574A (en) * 1990-02-23 1994-07-05 Mitsubishi Denki Kabushiki Kaisha Mobile communication system
US5206886A (en) * 1990-04-16 1993-04-27 Telebit Corporation Method and apparatus for correcting for clock and carrier frequency offset, and phase jitter in mulicarrier modems
US5128964A (en) * 1990-10-10 1992-07-07 Intelligent Modem Corporation Modulation method and apparatus for multicarrier data transmission
US5452288A (en) * 1992-04-08 1995-09-19 France Telecom Method for the transmission of digital data in radio paging systems and corresponding radio paging receiver
US5285474A (en) * 1992-06-12 1994-02-08 The Board Of Trustees Of The Leland Stanford, Junior University Method for equalizing a multicarrier signal in a multicarrier communication system
US6188729B1 (en) * 1993-04-01 2001-02-13 Scientific-Atlanta, Inc. Method and apparatus for effecting seamless data rate changes in a video compression system
US5479447A (en) * 1993-05-03 1995-12-26 The Board Of Trustees Of The Leland Stanford, Junior University Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines
US5497398A (en) * 1993-08-12 1996-03-05 Aware, Inc. Multi-carrier transceiver
US5596604A (en) * 1993-08-17 1997-01-21 Amati Communications Corporation Multicarrier modulation transmission system with variable delay
US5400322A (en) * 1993-08-20 1995-03-21 Amati Communications Corp. Updating of bit allocations in a multicarrier modulation transmission system
US5598435A (en) * 1993-12-23 1997-01-28 British Telecommunications Public Limited Company Digital modulation using QAM with multiple signal point constellations not equal to a power of two
US5555244A (en) * 1994-05-19 1996-09-10 Integrated Network Corporation Scalable multimedia network
US5625651A (en) * 1994-06-02 1997-04-29 Amati Communications, Inc. Discrete multi-tone data transmission system using an overhead bus for synchronizing multiple remote units
US5636246A (en) * 1994-11-16 1997-06-03 Aware, Inc. Multicarrier transmission system
US5644573A (en) * 1995-01-20 1997-07-01 Amati Communications Corporation Methods for coordinating upstream discrete multi-tone data transmissions
US5521906A (en) * 1995-01-26 1996-05-28 Motorola Inc. Method and apparatus for updating carrier channel allocations
US5682419A (en) * 1995-01-26 1997-10-28 Grube; Gary W. Method and apparatus for providing infrastructure call support
US5533008A (en) * 1995-01-26 1996-07-02 Motorola, Inc. Method and apparatus for providing a communication system infrastructure
US5812599A (en) * 1995-07-11 1998-09-22 Alcatel N.V. Method for allocating data elements in multicarrier applications and equipment to perform this method
US5822374A (en) * 1996-06-07 1998-10-13 Motorola, Inc. Method for fine gains adjustment in an ADSL communications system
US5822372A (en) * 1996-08-02 1998-10-13 Motorola, Inc. Multicarrier system using subchannel characteristics to implement different error rates within a data stream
US5910959A (en) * 1997-01-06 1999-06-08 Conexant Systems, Inc. Control channel for modems
US6009122A (en) * 1997-05-12 1999-12-28 Amati Communciations Corporation Method and apparatus for superframe bit allocation
US6072779A (en) * 1997-06-12 2000-06-06 Aware, Inc. Adaptive allocation for variable bandwidth multicarrier communication
US6011814A (en) * 1997-09-30 2000-01-04 Paradyne Corporation Adaptive comb filter and decision feedback equalizer for noise suppression
US6084917A (en) * 1997-12-16 2000-07-04 Integrated Telecom Express Circuit for configuring and dynamically adapting data and energy parameters in a multi-channel communications system
US6480475B1 (en) * 1998-03-06 2002-11-12 Texas Instruments Incorporated Method and system for accomodating a wide range of user data rates in a multicarrier data transmission system
US6052411A (en) * 1998-04-06 2000-04-18 3Com Corporation Idle mode for digital subscriber line
US6665872B1 (en) * 1999-01-06 2003-12-16 Sarnoff Corporation Latency-based statistical multiplexing

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7649928B2 (en) 1999-03-12 2010-01-19 Tzannes Marcos C Method for synchronizing seamless rate adaptation
US8934555B2 (en) 1999-03-12 2015-01-13 Intellectual Ventures Ii Llc Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US8718163B2 (en) 1999-03-12 2014-05-06 Intellectual Ventures Ii Llc Method for seamlessly changing power modes in an ADSL system
US8351491B2 (en) 1999-03-12 2013-01-08 Daphimo Co. B.V., Llc Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US8340200B2 (en) 1999-03-12 2012-12-25 Daphimo Co. B.V., Llc Method for seamlessly changing power modes in an ADSL system
US20080037666A1 (en) * 1999-03-12 2008-02-14 Aware, Inc. Method for seamlessly changing power modes in an adsl system
US8340162B2 (en) * 1999-03-12 2012-12-25 Daphimo Co. B.V., Llc Method for synchronizing seamless rate adaptation
US20120093172A1 (en) * 1999-03-12 2012-04-19 Daphimo Co.B.V., Llc Method for synchronizing seamless rate adaptation
US20070133705A1 (en) * 1999-03-12 2007-06-14 Aware, Inc. Method for synchronizing seamless rate adaptation
US8045601B2 (en) 1999-03-12 2011-10-25 Daphimo Co. B.V., Llc Method for synchronizing seamless rate adaptation
US8045603B2 (en) 1999-03-12 2011-10-25 Daphimo Co. B.V., Llc Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US20110064124A1 (en) * 1999-03-12 2011-03-17 Marcos Tzannes Method for seamlessly changing power modes in an adsl system
US20100329317A1 (en) * 1999-03-12 2010-12-30 Tzannes Marcos C Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US7860175B2 (en) 1999-03-12 2010-12-28 Tzannes Marcos C Method for seamlessly changing power modes in an ADSL system
US20100309967A1 (en) * 1999-03-12 2010-12-09 Tzannes Marcos C Method and a multi-carrier transceiver supporting dynamic switching between active appliction sets
US7813418B2 (en) 1999-03-12 2010-10-12 Tzannes Marcos C Method and a multi-carrier transceiver supporting dynamic switching between active application sets
US20080212660A1 (en) * 1999-03-12 2008-09-04 Aware, Inc. Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US7813419B2 (en) 1999-03-12 2010-10-12 Tzannes Marcos C Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US9369404B2 (en) 1999-03-12 2016-06-14 Intellectual Ventures Ii Llc Method and multi-carrier transceiver with stored application profiles for supporting multiple applications
US20050053229A1 (en) * 2003-09-08 2005-03-10 Tsatsanis Michail Konstantinos Common mode noise cancellation
US20050053097A1 (en) * 2003-09-08 2005-03-10 Djokovic Igor Shen Multi-channel communication system for multiple input, multiple output processing of an encoded signal
US7315592B2 (en) 2003-09-08 2008-01-01 Aktino, Inc. Common mode noise cancellation
US20080198909A1 (en) * 2003-09-08 2008-08-21 Michail Konstantinos Tsatsanis Efficient multiple input multiple output signal processing method and apparatus
US7415086B2 (en) 2003-09-08 2008-08-19 Aktino, Inc. Multi-channel communication system for multiple input, multiple output processing of an encoded signal
US20050180354A1 (en) * 2003-11-25 2005-08-18 Samsung Electronics Co., Ltd. Method for allocating subchannels in an OFDMA mobile communication system
US7411924B2 (en) * 2003-11-25 2008-08-12 Samsung Electronics Co., Ltd Method for allocating subchannels in an OFDMA mobile communication system
US20060029148A1 (en) * 2004-08-06 2006-02-09 Tsatsanis Michail K Method and apparatus for training using variable transmit signal power levels
US20060029147A1 (en) * 2004-08-06 2006-02-09 Tsatsanis Michail K Method and apparatus for training using variable transmit signal power levels
US7471732B2 (en) 2004-08-06 2008-12-30 Aktino, Inc. Method and apparatus for training using variable transmit signal power levels
WO2006081922A1 (en) * 2005-02-07 2006-08-10 Infineon Technologies Ag On-line reconfiguration and synchronization protocol for multi-carrier dsl
US20060176942A1 (en) * 2005-02-07 2006-08-10 Vladimir Oksman On-line reconfiguration and synchronization protocol for multi-carrier DSL
US8902820B2 (en) * 2005-06-28 2014-12-02 Koninklijke Philips N.V. Handshaking method and apparatus for OFDM systems with unknown sub-channel availability
US20100080167A1 (en) * 2005-06-28 2010-04-01 Koninklijke Philips Electronics, N.V. Handshaking method and apparatus for ofdm systems with unknown sub-channel availability
US20070061557A1 (en) * 2005-09-15 2007-03-15 Shauh Jack S Techniques for managing applications in a portable communication device
US7454607B2 (en) * 2005-09-15 2008-11-18 Qualcomm Incorporated Techniques for managing applications in a portable communication device
US20080089433A1 (en) * 2006-10-13 2008-04-17 Jun Hyok Cho Method and apparatus for adapting to dynamic channel conditions in a multi-channel communication system
EP1936855A1 (en) * 2006-12-21 2008-06-25 Alcatel Lucent Method and apparatus for configuring data paths over a multi-carrier signal
US20080215650A1 (en) * 2007-01-25 2008-09-04 Michail Konstantinos Tsatsanis Efficient multiple input multiple output signal processing method and apparatus
US8326906B2 (en) 2007-01-25 2012-12-04 Positron Access Solutions, Inc. Efficient multiple input multiple output signal processing method and apparatus
DE102008005290A1 (en) * 2008-01-19 2009-07-23 T-Mobile Internationale Ag DSL process variable upload / download bit rate and application-specific, dynamic profile switching
US20100070950A1 (en) * 2008-09-18 2010-03-18 Jeffrey John Smith Apparatus and methods for workflow capture and display
WO2012058170A1 (en) * 2010-10-26 2012-05-03 Qualcomm Incorporated Application specific resource management

Also Published As

Publication number Publication date Type
US6775320B1 (en) 2004-08-10 grant
US8351491B2 (en) 2013-01-08 grant
US20080159366A1 (en) 2008-07-03 application
US7813418B2 (en) 2010-10-12 grant
US20130195156A1 (en) 2013-08-01 application
US20080212660A1 (en) 2008-09-04 application
US20170041245A1 (en) 2017-02-09 application
US8934555B2 (en) 2015-01-13 grant
US8045603B2 (en) 2011-10-25 grant
US9369404B2 (en) 2016-06-14 grant
US20100309967A1 (en) 2010-12-09 application
US20150163164A1 (en) 2015-06-11 application
US7813419B2 (en) 2010-10-12 grant
US20100329317A1 (en) 2010-12-30 application
US6778596B1 (en) 2004-08-17 grant
US20040223510A1 (en) 2004-11-11 application

Similar Documents

Publication Publication Date Title
US6021158A (en) Hybrid wireless wire-line network integration and management
US6038251A (en) Direct equalization method
US6538986B2 (en) Data transmission system and method using nQAM constellation with a control channel superimposed on a user data channel
US5557612A (en) Method and apparatus for establishing communication in a multi-tone data transmission system
US6055268A (en) Multimode digital modem
US6345071B1 (en) Fast retrain based on communication profiles for a digital modem
US6021167A (en) Fast equalizer training and frame synchronization algorithms for discrete multi-tone (DMT) system
US6567464B2 (en) Fast retrain based on communication profiles for a digital modem
US5999563A (en) Rate negotiation for variable-rate digital subscriber line signaling
EP0820168A2 (en) Multimode modem, and protocols therefor
US5970088A (en) Reverse channel next cancellation for MDSL modem pool
US5910970A (en) MDSL host interface requirement specification
US6249543B1 (en) Protocol for transceiver initialization
US6434188B1 (en) Differential encoding arrangement for a discrete multi-tone transmission system
US5987061A (en) Modem initialization process for line code and rate selection in DSL data communication
US6137839A (en) Variable scaling of 16-bit fixed point fast fourier forward and inverse transforms to improve precision for implementation of discrete multitone for asymmetric digital subscriber loops
US6535550B1 (en) Transceiver with variable width cyclic prefix
EP0831624A2 (en) A modem
US6549512B2 (en) MDSL DMT architecture
US6870888B1 (en) Bit allocation among carriers in multicarrier communications
US6389062B1 (en) Adaptive frequency domain equalizer circuits, systems, and methods for discrete multitone based digital subscriber line modem
US6519280B1 (en) Method and apparatus for inserting idle symbols
US20030108095A1 (en) System and method for reducing noise induced by digital subscriber line (DSL) systems into services that are concurrently deployed on a communication line
US6590893B1 (en) Adaptive transmission system in a network
US6219378B1 (en) Digital subscriber line modem initialization

Legal Events

Date Code Title Description
AS Assignment

Owner name: DAPHIMO CO. B.V., LLC, DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AWARE, INC.;REEL/FRAME:022259/0569

Effective date: 20081219