Abstract: The present disclosure relates to a Time Duplex Division (TDD) modem and a method in such a modem for making Single Ended Line Test (SELT) measurements. The device comprises a transmitter and a receiver and it has a normal mode of TDD communication. In these devices, Time Domain Reflectometry (TDR) is used as line measurement. It has a number of drawbacks, and for overcoming said drawbacks, Frequency Domain Reflectometry (FDR) measurement techniques adapted for TDD devices are suggested.

Abstract: Disclosed is a method performed by a radio unit (10) operable in a base station system of a wireless communication network, for reducing interference at the RU. The base station system comprises a baseband unit (30) the radio unit (10) and a plurality of radio heads (21-26) wherein the radio unit is connected to the plurality of radio heads via a number of metallic conductors (40), and wherein a signal is to be communicated to the radio unit at a first frequency range over one of the number of metallic conductors from one of the plurality of radio heads.

Abstract: Disclosed is a method performed by a base station system of a wireless communication network, for increasing signal quality of signals sent from a radio head (RH) to a radio unit (RU) over a metallic conductor. The base station system comprising a baseband unit (BBU), the RU, and the RH, and the RU is connected to the RH via the metallic conductor. The method comprises, at the RH: amplifying, by an amplification unit, a signal to be transmitted from the RH to the RU; changing the signal amplification level of the amplification unit; and transmitting the amplified signal to the RU. The method further comprises, at the RU: receiving the amplified signal and compensating, by a compensating unit capable of adapting its amplification level, for the change in signal amplification level performed at the RH such that the strength of the signal is transparent to the base station system.

Abstract: It is presented a hybrid coil circuit comprising: a transformer; a common mode choke, wherein all choke windings are magnetically coupled; an impedance matching device connected on a middle choke winding, the impedance matching device being connected to ground; a first port being provided between a first choke winding and the impedance matching device; a second port being provided between a third choke winding and the impedance matching device; a third port being provided between either end of a second transformer winding; a first inductor arranged between the impedance matching device and the first port; and a second inductor arranged between the impedance matching device and the second port, wherein the first inductor and the second inductor are magnetically coupled.

Abstract: It is presented a method for determining a position of a wireless device, the method being performed in a network node connected to a plurality of remote radio head devices each comprising a first antenna device which can be used for a first MIMO, multiple input multiple output, stream and a second antenna device which can be used for a second MIMO stream. The method comprises the steps of: sending a first cell identifier for transmission on both the first antenna device and the second antenna device of each one of the remote radio head devices; sending a second cell identifier, for transmission on an antenna device of only a specific remote radio head device; receiving a measurement report from the wireless device associated with the second cell identifier; and determining a position of the wireless device based on the received measurement report.

Abstract: A central node for digital subscriber line access multiplex.

Abstract: There is provided mitigation of disconnect events in a vectoring based digital subscriber line, DSL, system. A method performed by a digital subscriber line access multiplexer, DSLAM, comprises detecting a loss of signal or disconnect event of a line in a vectored group of DSL lines, the loss of signal or disconnect event causing a negative impact on the DSL system. The method further comprises detecting a change in at least one downstream, DS, crosstalk coefficient of at least one line in said vectored group of DSL lines. The method further comprises determining a magnitude of said change. The method further comprises determining where the loss of signal or disconnect event has occurred by processing precoding coefficients of the vectored group of DSL lines. The method further comprises determining, on basis of the determined magnitude and where the loss of signal or disconnect event has occurred, an action to be performed by the DSLAM so as to mitigate for said negative impact.

Abstract: A method is provided performed by an access point for handling uplink communication in a communication system comprising the access point and a wire line network node connected via wire line to the access point. The method comprises receiving an encrypted and/or integrity protected packet data unit, PDU, from a user equipment (UE) wirelessly connected to the access point and detecting type of the received PDU, the type of PDU being any of a signaling radio bearer type or a data radio bearer type. The method further comprises encapsulating the received PDU by setting a header to the PDU, which header comprises an identity indicating the detected type of PDU and an identity indicating a source address and/or a destination address of the PDU, and sending the encapsulated PDU to the wire line network node. Provided is also a corresponding method performed in the wire line network node.

Abstract: Presented are methods and arrangements for adapting the load in a cell based on information on upcoming events related to a backhaul link. The upcoming events related to the backhaul link may be delayed in order to give enough time for an RBS to complete activities related to the load adaptation. Thus, UEs may be handed over to neighboring cells proactively, before the cell becomes overloaded due to events related to the backhaul link.

Abstract: A first network node of a cellular system is configured for communication with a second network node over a twisted pair wire. The first network node includes a receiver for receiving, over the twisted pair wire, an intermediate frequency signal from the second network node, which intermediate frequency signal has been converted from a high frequency signal having a frequency higher than the frequency of the intermediate frequency signal by the second network node, and a down-converter for converting the intermediate frequency signal to a low frequency signal having a frequency lower than the frequency of the intermediate frequency signal. The first network node also includes an up-converter for converting a received low frequency signal to an intermediate frequency signal having a frequency higher than the frequency of the low frequency signal.

Abstract: The invention relates to an interconnecting node for use in interconnecting a passive optical network (PON) and a copper wire xDSL access network, wherein said interconnecting node comprises an optical network unit (ONU) arranged to be connected to an optical line termination (OLT) over the PON network; and at least one xDSL access device connectable to at least one user end xDSL equipment over the copper wire xDSL access network. The interconnecting node is characterized in that it further comprises a clocking interconnect between the ONU unit and the at least one xDSL access device arranged to distribute a clock signal obtained from optical network transmissions received in the ONU unit over the PON network to an timing reference input of the at least one xDSL access device. The invention also relates to a further interconnecting node, methods for use in interconnecting nodes, a central office optical network apparatus and an access network.

Abstract: Disclosed is a method performed by a radio unit (10) operable in a base station system of a wireless communication network, for reducing interference at the RU. The base station system comprises a baseband unit (30) the radio unit (10) and a plurality of radio heads (21-26) wherein the radio unit is connected to the plurality of radio heads via a number of metallic conductors (40), and wherein a signal is to be communicated to the radio unit at a first frequency range over one of the number of metallic conductors from one of the plurality of radio heads.

Abstract: Disclosed is a method performed by a base station system of a wireless communication network, for increasing signal quality of signals sent from a radio head, RH, (21) to a radio unit, RU (10) over a metallic conductor (40). The base station system comprising a baseband unit, BBU (40), the RU and the RH and the RU is connected to the RH via the metallic conductor. The method comprises, at the RH amplifying (102), by an amplification unit, a signal to be transmitted from the RH to the RU changing (104) the signal amplification level of the amplification unit; and transmitting (108) the amplified signal to the RU. The method further comprises, at the RU receiving (114) the amplified signal and compensating (116), by a compensating unit capable of adapting its amplification level, for the change in signal amplification level performed at the RH such that the strength of the signal is transparent to the base station system.

Abstract: There is provided spectrum shaping of a signal. A frequency-domain representation of the signal to be spectrum-shaped is provided. The signal is associated with a set of constellation points having a minimum distance. A spectrum-shaped signal is determined by altering a proper subset of the constellation points whilst maintaining the minimum distance between all of the constellation points. The spectrum-shaped signal is transformed into a time-domain signal.

Abstract: A first network node of a cellular system is configured for communication with a second network node over a twisted pair wire. The first network node includes a receiver for receiving, over the twisted pair wire, an intermediate frequency signal from the second network node, which intermediate frequency signal has been converted from a high frequency signal having a frequency higher than the frequency of the intermediate frequency signal by the second network node, and a down-converter for converting the intermediate frequency signal to a low frequency signal having a frequency lower than the frequency of the intermediate frequency signal. The first network node also includes an up-converter for converting a received low frequency signal to an intermediate frequency signal having a frequency higher than the frequency of the low frequency signal.

Abstract: In a vectoring-capable DSL system, power can be saved by a low power mode wherein data transmission is reduced or halted, but synch symbols continue to be transmitted, so that estimation of crosstalk coefficients may continue during the low power mode. When crosstalk coefficient estimates are up to date, a line may exit low power mode without causing problematic changes of crosstalk noise in other lines, since the vectoring functionality will eliminate or reduce the crosstalk.

Abstract: Systems and methods for determining non-linear precoding coefficients are disclosed. In some embodiments, a method of determining non-linear precoding coefficients for transmitting at least one frequency tone on lines includes obtaining a channel matrix that relates an input of the lines to an output of the lines for the at least one frequency tone. The method also includes computing a metric for each line in a subset of the lines and determining a line order for the subset of the lines based on the metric for each line in the subset of the lines. The method also includes reordering elements of the channel matrix based on the line order for the subset of the lines to create a reordered channel matrix and determining the non-linear precoding coefficients based on the reordered channel matrix. This may provide a systematic way to sort lines and balance the bit rates between different lines.

Abstract: Method and arrangement in a Vectoring Control Entity, VCE, for handling disorderly events in a Digital Subscriber Line, DSL, system. The method involves a number of actions, to be performed when a disorderly event occurs on line m in a vectored group of DSL lines, and the transmission on line m is continued. The method comprises obtaining error samples from Customer Premises Equipments, CPEs, connected to other lines in the vectored group of DSL lines. The method further comprises—calculating an estimate of the channel coefficients changed due to the disorderly event, based on the error samples, thus providing a partial channel estimate. Further, the method comprises—modifying a downstream precoder, at least partly based on the partial channel estimate, such that retraining the other lines in the vectored group due to the disorderly event is avoided. The arrangement is adapted to enable the performance of the above described method.

Abstract: Transceiver node and method therein for enabling dynamic bandwidth assignment in bi-directional Time Division Duplexing (TDD) multicarrier communication over wire lines. The transceiver node is operable to be coupled to a plurality of loops, wherein each loop is terminated by a respective network terminal (NT). The method comprises collecting traffic reports from local and remote queues associated with uplink and downlink traffic on the plurality of loops, and determining an actual demand for upstream and downstream bandwidth, respectively, for each of the plurality of loops, based on the collected traffic reports. The method further comprises deriving an Upstream/Downstream (US/DS) frame partitioning based on the determined actual demand for upstream and downstream bandwidth, and providing an indication of the derived US/DS frame partitioning to the NTs. NTs are then scheduled in accordance with the derived partitioning.

Abstract: The present invention relates to a method and an arrangement for the power management of a digital communication line such as a digital subscriber line DSL (2201). A problem addressed by the invention is that the transitioning of the digital subscriber line (2201) from a low transmission power state to a high transmission power state can cause disturbance to adjacent lines. This problem is solved by the current invention by an access node AN (2100) that is arranged to step-wise increase the power state until the high transmission power state has been reached. The invention also comprises embodiments of monitoring and detecting traffic events that serve as triggers of the transitioning.