Telefonaktiebolaget Lm Ericsson (publ)

Jaume Rius I Riu

Chenguang Lu

Samita Chakrabarti

John Fornehed

John Larkins

Fredrik Lindqvist

Boris Dortschy

Aldebaro Klautau

Per Ödling

Ronaldo Zampolo

Miguel Berg

Elmar Trojer

Suresh Krishnan

Antoni Fertner

Per Ola Börjesson

Thomas Magesacher

Jonathan Olsson

Sumit Singhal

Jonas Emanuel Rosenberg

Henrik Back

Joäo C Weyl Albuqerque Costa

Filipe Alexandre Rodrigues De Moura Leitao

Claudomiro De Souza De Sales, Jr

Inigo Pinilla

Moraes Rodrigo Bastos

Stefan Allevad

Rodrigo Bastos Moraes

Per ÖDling

Ronaldo De Freitas Zampolo

Aldebaro Barreto Da Rocha Klautau

Claudomiro De Souza De Sales Junior

Joao Cristostomo Weyl Albuquerque Costa

Per Mikael Ödling

Henrik Daniel Back

Stefan Alf Allevad

A scheme for providing access to 6LoWPAN data in a wireless access network comprising a Digital Unit (DU) coupled to one or more Radio Units (RU) via CPRI links, each RU in turn coupled to one or more radio dot (RD) elements via Ethernet cable links. In one embodiment, an RD element includes a cable front-end interfaced with the Ethernet cable link, a radio front-end interfaced between the cable front-end and an antenna or a suitable access point. A sensor component may be included that is configured to generate sensor data with respect to a measurement variable, which sensor data may be packaged in a 6LoWPAN data format for transmission to the RU element coupled to the RD element.

Active antenna element (AAE) implementation for facilitating 6LoWPAN data access

A scheme for providing access to 6LoWPAN data in a Pico-Remote Radio Unit (PRRU)-based wireless access network. In one embodiment, the PRRU network comprises a Baseband Unit (BBU) coupled to one or more remote Radio Hub (RHUB) elements via a first set of CPRI links, each RHUB element in turn coupled to one or more PRRU elements via corresponding second sets of CPRI links. The BBU element comprises an interface for communicating 6LoWPAN data to and from a router coupled to an IPv6 network. The BBU element also includes a bridging functionality operative to determine endpoint PRRU elements' addresses and corresponding RHUB elements' addresses by querying an address mapping database.

Pico-RRU-based network implementation for facilitating 6LOWPAN data access

A scheme for providing access to 6LoWPAN data in a wireless access network. In one embodiment, a Digital Unit (DU) of the wireless access network is provided with IP bridging functionality for packaging 6LO data as a control channel message. When the DU element receives 6LO data from an external router, the data is packaged in a format specified for a control channel associated with a CPRI link coupling to a Radio Unit (RU). The bridging functionality is operative to transmit the control channel message (including the packaged 6LO data packets) to the RU element based on an address mapping between the destination IP address of the 6LO data packets and an address of the 6LO endpoint coupled to the RU element.

Baseband unit (BBU) implementation for facilitating 6LoWPAN data access

Pico-RRU-based network implementation for facilitating 6LoWPAN data access

A scheme for providing access to 6LoWPAN data in a wireless access network. In one embodiment, a Radio Unit (RU) of the access network is provided with IP bridging functionality for packaging 6LO data as a control channel message. When the RU element receives 6LO data from an external router, the data is packaged in a format specified for a control channel associated with an Ethernet cable link coupling the RU element to a 6LO endpoint of the access network. The bridging functionality is operative to transmit the control channel message (including the packaged 6LO data packets) to the 6LO endpoint based on an address mapping between the destination IP address of the 6LO data packets and the 6LO endpoint's address.

Systems, methods, apparatuses, devices and associated computer-readable media for providing 6LoWPAN data access

The present invention relates to a precoder for a communication system arranged to provide transmission blocks for transmission over a transmission channel based on inputted symbol blocks. The precoder is arranged to pre-distort each symbol block based on an estimate of the characteristics of the transmission channel so that the corresponding transmission block appears to be undistorted after transmission over the transmission channel. In accordance therewith, the precoder is arranged to apply Tomlinson-Harashima precoding on a sum of a first measure corresponding to predistortion so as to remove intrasymbol interference and a second measure corresponding to predistortion so as to remove intersymbol interference. The present invention further relates to a method for providing transmission blocks for transmission over a transmission channel in a communication system.

Precoder for a communication system and methods used in said communication system

A method, central unit, and modem for reducing crosstalk in a Digital Subscriber Line (DSL) system. A virtual line referred to as a ghost line is introduced in the system as a substitution for all of the lines except a first line to induce crosstalk to the first line. The Power Spectral Density (PSD) on the first line is allocated to optimize against the ghost line. A modem on the first line reports to a central Spectrum Management Center (SMC), a measure indicating crosstalk impact from the ghost line. This process is repeated for each line. The SMC calculates updated ghost line parameters for each line, which reflect current crosstalk characteristics between each modem and the remaining modems, and sends the updated parameters to the modems. The modems then reallocate PSDs with respect to the updated ghost line parameters to either maximize the rate or minimize the power on their respective lines.

Method central unit, and modem in a digital subscriber line network

A method and device for estimating one or more transmission properties of a telecommunication transmission line. At least one signal is sent on the line, the at least one signal including at least two frequencies for which the absolute value of the line propagation constant times the line length is less than &#x3c0;, and a resulting signal is received. An estimate of at least one transmission line property is then determined by examining the relationship between the sent and resulting signal or signals. The process may be repeated, if necessary. The estimate determination may also be repeated one or more times, with each successive estimate preferably using for the determination only those frequencies for which, as previously estimated, the absolute value of the line propagation constant times the line length is less than &#x3c0;.

Method and device for estimating properties of a telecommunication transmission line

A method and loop qualification unit for determining loop parameters of a topology of a twisted pair loop for a digital subscriber line system. The parameters are represented by a vector that receives a measurement of a SELT parameter measured at one end of the loop and a measurement of a DELT loop transfer function measured at both ends of the loop. A first model generator generates a first model for the SELT parameter and a second model generator generates a second model for the DELT function based on the loop parameters represented by the vector. A processor then determines the parameters by minimizing the differences between the first model and the SELT parameter, and the second model and the DELT function. The determined parameters are represented by the vector that provides the minimization.

Method and arrangement for loop qualification in a digital subscriber line (DSL) system

A method and transmitter unit in a multi-tone multi-line based transmission system such as a digital subscriber line system for determining a Power Spectral Density (PSD) of a plurality of users over a physical channel for at least one tone. Each of the users has a minimum required data rate and a maximum allowed power. A Power Minimization Problem (PMP) is formulated mathematically introducing Lagrangian multipliers and by utilizing a dual decomposition approach for the objective function of the PMP in order to solve the PMP on a per-tone basis.

Method and arrangement for power minimization in a multi-tone transmission-based communication system

A qualification and monitoring function () monitors the line conditions of a last mile access network that is connected with a multi-access broadband network. The qualification and monitoring function () sends data to a Resource Manager () of the access network upon request. The monitoring function collects, stores, and analyzes performance data, media conditions and stability data using interpretation filters to derive performance indicators. The conditions of the network are also automatically provided to the resource manager () for immediate attention if the access network conditions exceed predetermined thresholds.

Distributed resource management for multi-service, multi-access broadband networks

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Bromma, Sweden

Jaume Rius I Riu