Nokia Solutions and Networks Oy

Alcatel Lucent

Nokia of America Corporation

Paschalis Tsiaflakis

Carl Jeremy Nuzman

Jochen Maes

Werner Coomans

Wouter Lanneer

Yannick Lefevre

Dirk Vanderhaegen

Danny Van Bruyssel

Koen De Schepper

Hong Yang

Danny De Vleeschauwer

Philippe Dierickx

Nicolas Dupuis

Geert Bert Ysebaert

Sarvesh Sanjay Bidkar

Mihaela Jivanescu

Alain Anderlini

Konstantinos Christodoulopoulos

Gert-Jan Stockman

Wim Van Damme

Rodrigo Bastos Moraes

Koen A E De Schepper

Coomans Werner

Koen AE De Schepper

An optical line terminal is disclosed. The optical line terminal comprises at least one processor; and at least one memory including machine-readable instructions. The at least one memory and the machine-readable instructions are configured to, with the at least one processor, cause the optical line terminal to determine based on one or more variables a relationship between bandwidth efficiency and latency for communication of contents of a queue buffer of an optical network unit with the optical line terminal via an optical distribution network, and determine a burst schedule for the queue buffer based on the determined relationship.

Bandwidth allocation

An apparatus is disclosed, which may include: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving downlink channel estimates between a plurality of access point (AP) antennas of one or more APs and a plurality of user equipment (UE) antennas of one or more UEs; iteratively updating a set of power allocation weights for the AP antennas using weights extracted from a precoder; computing the precoder based on the received channel estimates and a previous set of power allocation weights; performing the iterative updates until a stopping criterion is reached; and outputting data representative of a precoder computed from the received channel estimates and the updated set of power allocation weights.

Low complexity precoder

Example embodiments describe means () for performing i) pre-compensating (, N sets of Ktone data values () for crosstalk between N communication lines; the N sets of Ktone data values pertaining to respective N terminal nodes of a digital communication system; ii) calculating () from the pre-compensated N sets of Ktone data values () N sets of first time domain symbols (); iii) calculating () a second time domain symbol () from a set of Ktones values (); the Ktone data values pertaining to a selected one of the N terminal nodes; and iv) adding () the second time domain symbol in a weighted manner to the first time domain symbols such that the second time domain symbol is added to the first time domain symbol for the selected terminal node and to at least one other of the first time domain symbols for the respective other terminal nodes.

Discontinuous time-frequency operation

Embodiments relate to an apparatus comprising means configured for:

Method and apparatus for monitoring a communication line

The present disclosure relates to an equalizer training unit for deriving equalization parameters for compensating data-dependent distortion in received samples by use of a training sequence including a sequence p&#x3e;1 times and cyclically comprising N sub-sequences of respective combinations of L time-domain symbols of a modulation scheme, wherein the N sub-sequences are cyclically arranged in a selected order and such that L&#x2212;1 symbols of a respective sub-sequence overlap with symbols in the preceding and following sub-sequences. The present disclosure further relates to a training sequence generator unit for generative the training sequence and an equalizer employing the equalizer training unit.

Equalizer and an equalizer training unit for data-dependent distortion compensation

A wired communication systems, a subscriber device and a method, and more specifically related to initialization and/or update of communication parameters used for communication through the wired communication systems. An access node comprises at least one processor and memory storing instructions that when executed by the at least one processor cause a local transceiver of the access node to transmit signaling data via a subscriber line to a remote transceiver, the signaling data identifying particular symbol positions within a sequence of symbols transmitted over the subscriber line during show-time as being suitable for characterizing a direct communication channel between the local transceiver and the remote transceiver.

Direct channel characterization for discontinuous time-frequency operation

The present invention relates to a communication controller () and method for controlling communications between an access node () and a plurality of remote communication units () coupled to the access node via at least one wired transmission medium (). At least one communication unit () of the access node and of the plurality of remote communication units is configured to operate in full-duplex mode according to a first full-duplex communication profile (OP) when using a first subset of transmission resources (TSSET; TONESET) selected from a whole set of transmission resources available for communication over the at least one transmission medium, and according to a second full-duplex communication profile (OP) when using a second non-overlapping subset of transmission resources (TSSET; TONESET) selected from the whole set of transmission resources. The first full-duplex communication profile includes first downstream and upstream transmit power profiles (PSDDS, PSDUS) to achieve first aggregate downstream and upstream data rates (DSMAX, USMIN; DSMAX, USMIN) over the at least one transmission medium, and the second full-duplex communication profile includes second downstream and upstream transmit power profiles (PSDDS, PSDUS) to achieve second aggregate downstream and upstream data rates (USMAX, DSMIN; USMAX, DSMIN) over the at least one transmission medium distinct from the respective first aggregate downstream and upstream data rates. The present invention also relates to a so-configured full-duplex communication unit.

Method and apparatus for full-duplex communication over wired transmission media

A communication system in which DRA control is aided by RL. An example embodiment may control one or more buffer queues populated by downstream and/or upstream data streams. The egress rates of the buffer queues can be dynamically controlled using an RL technique, according to which a learning agent can adaptively change the state-to-action mapping function of the DRA controller while circumventing the RL exploration phase and relying on extrapolation of the already taken actions instead. This feature may result in at least two benefits: (i) cancellation of a performance penalty typically associated with RL exploration; and (ii) faster learning of the environment, as the learning agent can determine the performance metrics of many actions per state in a single occurrence of the state. In an example embodiment, the communication system may be a DSL system, a PON system, or a wireless communication system.

Dynamic resource allocation aided by reinforcement learning

A vectoring controller for configuring a vectoring processor that jointly processes DMT communication signals to be transmitted over, or received from, a plurality of N subscriber lines according to a vectoring matrix. In accordance with an embodiment, the vectoring controller is configured, for given ones of a plurality of tones, to enable the given tone for direct data communication over a first set of N&#x2212;Mk targeted lines out of the plurality of N subscriber lines, and to disable the given tone for direct data communication over a second disjoint set of Mk supporting lines out of the plurality of N subscriber lines, Mk denoting a non-null positive integer. The vectoring controller is further configured to configure the vectoring matrix to use an available transmit or receive power at the given tone over the second set of Mk supporting lines for further enhancement of data signal gains at the given tone over the first set of N&#x2212;Mk targeted lines.

Targeted rectangular conditioning

A digital circuit for implementing a channel-tracking functionality, in which an adaptive (e.g., FIR) filter is updated based on reinforcement learning. In an example embodiment, the adaptive filter may be updated using an LMS-type algorithm. The digital circuit may also include an electronic controller configured to change the convergence coefficient of the LMS algorithm using a selection policy learned by applying a reinforcement-learning technique and based on residual errors and channel estimates received over a sequence of iterations. In some embodiments, the electronic controller may include an artificial neural network. An example embodiment of the digital circuit is advantageously capable of providing improved performance after the learning phase, e.g., for communication channels exhibiting variable dynamicity patterns, such as those associated with aerial copper cables or some wireless channels.

Communication-channel tracking aided by reinforcement learning

A vectoring controller is configured to determine first coefficient values for a vectoring matrix at a first tone based on a first number of iterations through an iterative update algorithm and a first channel matrix estimate at the first tone, and to determine second coefficient values for the vectoring matrix at a second neighboring tone based on a second number of iterations through the iterative update algorithm and a second channel matrix estimate at the second tone. The vectoring controller is configured to start with the first coefficient values as initial values for the respective second coefficient values in the iterative update algorithm. The second number of iterations is lower than or equal to the first number of iterations.

Method and apparatus for determination of vectoring matrices

A multi-line digital transceiver configured to use digital signal vectoring in a manner that causes effects of crosstalk between distinct groups of subscriber lines to be effectively mitigated, without directly attempting to mitigate effects of crosstalk within any one of those distinct groups. In an example embodiment, effects of crosstalk within each of the distinct groups can be mitigated indirectly using an appropriate T/FDMA schedule, according to which, during a given symbol period, a given resource block of any of the distinct groups can carry data corresponding to a single respective subscriber. A precoder (postcoder) matrix for the digital signal vectoring can be generated using block-diagonalization techniques appropriately constrained, e.g., using the groups' definitions, aggregate-transmit-power restrictions, etc. In various embodiments, the disclosed digital signal vectoring can be used on the downlink or on the uplink, or both.

Use of vectoring and time- and/or frequency&#x2014;division multiple access in a multi-user connection

A multi-line digital transceiver configured to use low-complexity beamforming on at least some tones to boost effective SNR values for selected subscriber lines. In an example embodiment, the beamforming coefficients can be restricted to one-bit values or two-bit values, e.g., such that the corresponding beamforming computations can be implemented using only sign changes, swaps of the real and imaginary parts, and/or zeroing of some values, and without invoking any full-precision hardware multiplication operations. At least some embodiments can be run on a significantly simpler and/or less powerful vectoring engine than conventional beamforming solutions while still being able to provide nearly optimal beamforming SNR gains. In some embodiments, additional scaling by powers of two may be applied to at least some signals contributing to the beamforming, e.g., to satisfy power constraints for some or all of the subscriber lines.

Low-complexity beamforming for a multi-line communication system

At least one example embodiment discloses a method including determining a first set of lines and a second set of lines in a system, obtaining signals to be transmitted over, or received from, the first set of lines and the second set of lines, obtaining normal operation interval (NOI) vectoring coefficients for the second set of lines, determining discontinuous operation interval (DOI) vectoring coefficients for the first set of lines, the DOI vectoring coefficients for the first set of lines and the NOI vectoring coefficients for the second set of lines being part of a vectoring matrix and jointly processing the signals for a discontinuous operation interval using the vectoring matrix.

Growing community of inventors

Schriek, Belgium

Paschalis Tsiaflakis