Lantiq Deutschland Gmbh

Infineon Technologies Ag

Lantiq Beteiligungs Gmbh & Co. Kg

Umashankar Thyagarajan

Bernd Heise

Axel Clausen

Gert Schedelbeck

Thomas Zettler

Dietmar Schoppmeier

Frenzel Rudi

Vladimir Oksman

Stefan Uhlemann

Reinhard Stolle

Michael Horvat

Rudi Frenzel

Stefan Krause

According to an embodiment, a DSL transceiver includes a power mode controller and a transmitter. The power mode controller is configured to set the DSL transceiver in a low power mode and move the DSL transceiver out of the low power mode responsive to the DSL transceiver receiving data. The transmitter is configured to transmit data only on a first group of sub-carriers when the power mode controller is moving the DSL transceiver out of the low power mode, the first group of sub-carriers being a subset of the sub-carriers available to the DSL transceiver for transmission.

DSL modem with low-power mode

A communication device includes a transmitter operable to couple to a plurality of transceivers via a plurality of transmission channels, transmit payload data via the plurality of transmission channels, and obtain monitored transmission conditions for one or more transmission channels in the plurality of transmission channels. During operation, the transmitter is further operable to generate reconfiguration request signals resultant from processing the monitored transmission conditions and transmit the reconfiguration request signals on transmission channels in the plurality of transmission channels.

Reconfigurable communication device and method

According to an embodiment, a DSL transceiver is set in a low power mode and moved out of the low power mode responsive to the DSL transceiver receiving data. Data is transmitted only on a first group of sub-carriers when moving the DSL transceiver out of the low power mode, the first group of sub-carriers being a subset of the sub-carriers available to the DSL transceiver for transmission.

Methods of implementing low-power mode for DSL modems

One embodiment relates to a method of communicating data between a transmitter and a receiver of a communication system. In this method, a payload data stream is received from a network interface layer. The payload data stream includes data units eligible for retransmission and data units non-eligible for retransmission. These data units are grouped into containers, where a container is associated with a container identifier that distinguishes the container from other containers. The containers are grouped into data transmission units, where a data transmission unit includes at least one container along with redundancy information that facilitates error detection for that data transmission unit. The data transmission units are transmitted to the receiver as a transmission data stream. Other methods and systems are also disclosed.

Retransmission scheme for communication systems

Allocation of different signal-to-noise margins to different carriers in a multi-carrier system is described. A preferred embodiment comprises assigning signal-to-noise ratio (SNR) margins to carriers in a multi-carrier system, comprises assigning a first SNR margin to a first data service based upon a first service characteristic, assigning a second SNR margin to a second data service based upon a second service characteristic, transmitting data associated with the first data service using the first signal-to-noise margin, and transmitting data associated with the second data service using the second signal-to-noise margin.

Allocation of signal-to-noise ratio margin in multi-carrier systems

One embodiment relates to a method of transmitting data from a transmitter to a receiver. In the method, a payload data stream is provided which comprises a plurality of payload data units. A container stream is formed which comprises a plurality of containers having respective container identifiers, where a container includes an integer number of the payload data units and where the container identifiers collectively establish a predetermined order for consecutive containers. A codeword stream is formed which comprises a plurality of codewords having respective redundancy information, where a codeword includes at least a portion of the container and where redundancy information of the codeword facilitates detection of erroneous data in the codeword. The codeword is transmitted from the transmitter to the receiver. Other methods and systems are also disclosed.

A first communication device estimates upstream channel conditions for an upstream channel and determines an upstream memory requirement for a first buffer at a second communication device and a first buffer at the first communication device based on the upstream channel conditions. A downstream memory requirement is received from the second communication device for a second buffer at the first communication device and a second buffer at the second communication device based on downstream channel conditions estimated at the second communication device for a downstream channel. The first communication device determines whether the sum of the upstream and downstream memory requirements exceeds an available amount of memory for implementing the first and second buffers at the first communication device and revises at least one of the memory requirements if the sum of the upstream and downstream memory requirements is different than the available amount of memory.

Interleaver memory allocation method and apparatus

A method of transmitting data includes generating interleaved data. The method also includes converting the interleaved data into a modulated signal, and transmitting the modulated signal. The interleaved data is also stored, for example, in a buffer. The method further includes determining whether a retransmission of the modulated signal is required, and retransmitting the interleaved data based on a result of that determination.

Data transmission method, transmitter, receiver, transceiver and transmission system

According to one embodiment, memory is allocated between an interleaver buffer and a de-interleaver buffer in a communication device based on downstream and upstream memory requirements. The upstream de-interleaver memory requirement is determined based on upstream channel conditions obtained for a communication channel used by the communication device. The memory is allocated between the interleaver and de-interleaver buffers based on the downstream and upstream memory requirements. The downstream interleaver memory requirement may be determined based on one or more predetermined downstream configuration parameters. Alternatively, the downstream interleaver memory requirement may also be determined based on the upstream channel conditions by estimating the downstream capacity of the communication channel based on the upstream channel conditions and determining an interleaver buffer size that satisfies one or more predetermined downstream configuration parameters and the downstream capacity estimate.

A method of transmitting data includes storing a first set of transmission data and a first set of retransmission data. A first ratio of transmission data to retransmission data is determined. A plurality of transmission data units is generated with each data unit including a portion of transmission data from the first set of transmission data and a portion of retransmission data from the first set of retransmission data in accordance with the first ratio. The plurality of transmission data units is transmitted.

System and method for transmitting and retransmitting data

One embodiment of the present invention relates to a network device. The network device includes a receiver configured to be coupled to a transmission medium supporting a multi-carrier channel over which data is communicated as symbols in a first communication state according to an initial bit-loading configuration. The receiver is further configured to detect noise that can corrupt the symbols on the multi-carrier channel. In addition, the receiver is configured to, in response to the detected noise, allocate at least part of the multi-carrier channel to a transient robust channel that facilitates adaptive communication. Other methods and devices are also disclosed.

Growing community of inventors

Munich, Germany

Umashankar Thyagarajan