Abstract: A method (10) of controlling utilization of a fronthaul link in a wireless communication network, the fronthaul link being configured to transport a time-domain sample representation of a carrier having a traffic load, the time-domain sample representation of the carrier being generated at a bit rate. The method comprising: obtaining (12) an indication of a traffic load of the carrier; determining (14) a new bit rate for the time-domain sample representation of the carrier, the new bit rate being dependent on the indication of the traffic load of the carrier; and generating (16) a control signal configured to cause the time-domain sample representation of the carrier to be generated at the new bit rate.

Abstract: It is provided a method for reducing interference. The method is performed in a receiver and comprises the steps of: receiving a first signal forming part of a symbol; extracting a differential signal by comparing the first signal with a second signal, wherein the first signal and the second signal are based on the same information; estimating a base frequency of the differential signal for the symbol; mapping the base frequency to a first time of the symbol; estimating frequencies at other times of the symbol using interpolation and/or extrapolation using base frequencies from at least one adjacent symbol; reconstructing an interfering signal based on the estimated frequencies; and subtracting the reconstructed interfering signal from a received signal for the symbol.

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: It is provided a method for reducing bit rate requirement over an uplink fronthaul link. The method is performed in a fronthaul transmitter of a radio network node and comprises the steps of: determining a group of frequency-domain resource elements having been received over a wireless channel (40); estimating channel information (42); reducing a number of bits for representing the respective frequency-domain resource element, to thereby obtain a modified resource element (44); transmitting the modified resource elements of the group over the fronthaul link to a fronthaul receiver (46); and transmitting compression metadata (48), indicating how the reduction was performed, over the fronthaul link to the fronthaul receiver which performs the steps of receiving the modified resource elements (50), receiving the compression metadata (52) and expanding the resource elements to increase the number of bits for representing the frequency-domain resource elements (54).

Abstract: The invention relates to a multi-carrier base station and a method performed at the multi-carrier base station configured to enable wireless access to wireless communication terminals. In an aspect, a device is provided configured to provide wireless communication access to wireless communication terminals. The device comprises a Base Transceiver Station (BTS), configured to be connectable to a core network, a tethering access point, and at least one antenna. The BTS is configured to provide at least a first carrier via the at least one antenna for Third Generation Partnership Project (3GPP) wireless access, and further to provide the tethering access point via a wired connection with at least a second carrier exclusively used by the tethering access point for 3GPP access. Moreover, the tethering access point is configured to provide non-3GPP wireless access via the at least one antenna.

Abstract: It is provided a splitter device comprising: a first trunk cable interface for connecting with a first aggregation node via a first trunk cable; a first radio head interface for connecting to a first remote radio head via a first distribution cable; a second radio head interface for connecting to a second remote radio head via a second distribution cable; a signal combiner and splitter connected to the first radio head interface and the second radio head interface; and a radio signal refresh unit provided between the first trunk cable interface and the signal combiner and splitter. The radio head interfaces comprise respective gain control units and uplink signal amplifiers, wherein a gain of the uplink signal amplifiers is adjusted based on a signal from the respective gain control unit.

Abstract: It is provided a method for reducing interference. The method is performed in a receiver and comprises the steps of: receiving a first signal forming part of a symbol; extracting a differential signal by comparing the first signal with a second signal, wherein the first signal and the second signal are based on the same information; estimating a base frequency of the differential signal for the symbol; mapping the base frequency to a first time of the symbol; estimating frequencies at other times of the symbol using interpolation and/or extrapolation using base frequencies from at least one adjacent symbol; reconstructing an interfering signal based on the estimated frequencies; and subtracting the reconstructed interfering signal from a received signal for the symbol.

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

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: 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: Vector Control Entity and method therein for Disorderly Leaving Events, DLEs, causing Sudden Termination Change in a DSL system. The method comprises, when a DLE occurs on a line m in a vectored group of DSL lines, and the transmission on line m is, at least partly, continued: obtaining at least one error sample from CPEs connected to other lines in the vectored group of DSL lines, and calculating an estimate of the channel coefficients, H?, changed due to the DLE. The estimate is calculated based on the at least one error sample, and thus a channel estimate is provided. The method further comprises modifying a downstream precoder, based on the channel estimate, such that retraining of the other lines in the vectored group due to the DLE is avoided. The estimate of the channel coefficients is calculated based on the model H?=H+C?H.

Abstract: Disclosed is a method for mitigating crosstalk performed by a network node of a wireless communication network operable in a base station system of the wireless communication network, the base station system comprising an intermediate radio unit, IRU, a baseband unit, BBU, connected to the IRU and a plurality of radio heads, RHs, connected to the IRU via a plurality of metallic conductors.

Abstract: 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.

Abstract: 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.

Abstract: It is presented a method for testing a cable connectable to a remote radio head. The method is performed in a test device and comprises the steps of: generating an outbound test container, the outbound test container comprising digital samples representing a test signal; transmitting the outbound test container and a frequency parameter indicating a frequency on which the test signal is to be transmitted to a converter device being connectable to a plurality of remote radio heads via respective cables, for transmission by the converter device; receiving an inbound test container, the inbound test container comprising digital samples of a response signal received by the converter device based on the outbound test container; and evaluating the inbound test container.

Abstract: It is provided a splitter device comprising: a first trunk cable interface for connecting with a first aggregation node via a first trunk cable; a first radio head interface for connecting to a first remote radio head via a first distribution cable; a second radio head interface for connecting to a second remote radio head via a second distribution cable; a signal combiner and splitter connected to the first radio head interface and the second radio head interface; and a radio signal refresh unit provided between the first trunk cable interface and the signal combiner and splitter. The radio head interfaces comprise respective gain control units and uplink signal amplifiers, wherein a gain of the uplink signal amplifiers is adjusted based on a signal from the respective gain control unit.

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: 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 while maintaining the minimum distance between all of the constellation points. The spectrum-shaped signal is transformed into a time-domain signal.

Abstract: A device for limiting crosstalk between vectoring modems connected to a group of communication lines comprises a subgroup determining element that obtains information of the division into subgroups, each subgroup being made up of lines experiencing cross-talk from each other, and assigns operational pilot sequences to the group according to the division, an operational sequence transmission control element that transmits the operational sequences on the lines to the modems, which sequences are mutually orthogonal to each other and each communication line receives a corresponding sequence, and a corrective action determining element that obtains cross-talk measurements related to the transmitted operational pilot sequences and determines, for each subgroup, cross-talk and corrective action based on measurements made for a number of sequence symbols, which number corresponds to the minimum number required for obtaining mutually orthogonal pilot sequences within the subgroup.

Abstract: Vector Control Entity and method therein for Disorderly Leaving Events, DLEs, causing Sudden Termination Change in a DSL system. The method comprises, when a DLE occurs on a line m in a vectored group of DSL lines, and the transmission on line m is, at least partly, continued: obtaining at least one error sample from CPEs connected to other lines in the vectored group of DSL lines, and calculating an estimate of the channel coefficients, H?, changed due to the DLE. The estimate is calculated based on the at least one error sample, and thus a channel estimate is provided. The method further comprises modifying a downstream precoder, based on the channel estimate, such that retraining of the other lines in the vectored group due to the DLE is avoided. The estimate of the channel coefficients is calculated based on the model H?=H+C?H.