Abstract: It is an object of the present invention to adequately report the SRS transmission timing and SRS parameters to a mobile terminal apparatus, when an aperiodic SRS is adopted, and efficiently use radio resources to be used for SRS transmission. A radio base station apparatus that reports SRS transmission control information to a mobile terminal apparatus and controls transmission of an SRS by the mobile terminal apparatus, and the radio base station apparatus has an SRS setting section that selects bit information to report to the mobile terminal apparatus, from a table having bit information to indicate not to trigger the SRS and bit information to indicate to trigger the SRS using a default SRS parameter, and a reporting section that reports the bit information for the mobile terminal apparatus using a downlink control channel.

Abstract: The formation of a wireless device group for use in a computing environment involves establishing a wireless communication connection between a host wireless interface device and each of one or more dependent wireless interface devices, in which each dependent wireless interface device is configured to not directly communicate with a computing device. Another wireless communication connection is established between the host wireless interface device and the computing device when the host wireless interface device is within a host connection distance of the computing device. A further wireless communication connection can be established between the host wireless interface device and a second, different computing device.

Abstract: The estimation of an amount of chromatic dispersion using a training signal sequence is possible. A transmission method includes: a training signal sequence generation step of generating, as training signal sequences, a plurality of signal sequences having power concentrated in a plurality of frequency bands, the power concentrated at different frequency bands; a training signal sequence selection step of selecting at least one training signal sequence from among the plurality of training signal sequences generated in the training signal sequence generation step, a signal multiplexing step of generating a signal sequence obtained by time-division multiplexing the training signal sequence selected in the training signal sequence selection step with a transmission data sequence, and an electrical-to-optical conversion step of transmitting the signal sequence generated in the signal multiplexing step as an optical signal.

Abstract: Receiver using antenna beam forming for tracking a transmitter signal and method for tracking the transmitter signal. The receiver includes a beam forming network comprising at least one beam forming channel for weighting each of N signals received from an N-element antenna array with an assigned weighting factor for forming a beam for tracking a transmitter signal of a certain transmitter, and a calibrator structured and arranged to calibrate the weighting factor (Wi) assigned to a signal (i) selected from the N signals by determining an average phase difference (??) between consecutive samples of the selected signal and consecutive samples of a reference signal and structured and arranged to adapt the weighting factor (Wi) of the selected signal depending on the determined average phase difference (??), where (i) is a number between 1 and N.

Abstract: A method for retransmitting data in wireless communication system is disclosed. MS can receive a NACK (Not-Acknowledge) signal from a base station (BS) through a specific downlink subframe of a specific frame in a first superframe, and the MS can retransmits the data using a second uplink subframe in a first frame in a second superframe subsequent to a first superframe. In this case, a index of the second uplink subframe may be 1. The wireless communication system can support the Half-Frequency Division Duplex (H-FDD) scheme. A first uplink subframe in the first frame of the second superframe can be punctured.

Abstract: In the presence of an assignment of the downlink resource block to the UE2-1, the eNB1-1 requests the UE2-1 to transmit SRS in the frequency band corresponding to the comb 0, and in the absence of the assignment of the downlink resource block to the UE2-1, the eNB1-1 requests the UE2-1 to transmit SRS in the frequency band corresponding to the comb 1. The UE2-1 transmits the SRS of the frequency band corresponding to the request.

Abstract: The present disclosure relates to a radio system (1), a base band unit (20) and a method (100) for relaying radio signals in a cell (101) of a mobile network. The radio signals are relayed according to a service criterion (300). With the present invention the radio signals are grouped into a grouped payload signal (30-1, 30-2, . . . , 30-M) and a grouped receive signal (220-1, 220-2, . . . , 220-M) according to the service criterion (300). The grouped payload signal (30-1, . . . , 30-M) and the grouped receive signal (220-1, 220-2, . . . , 220-M) are associated with a beam forming vector (40-1, 40-2, . . . , 40-M). The grouping according to the present disclosure helps to improve a quality of service provided to an individual user of the mobile network. The associated beam forming vector (40-1, 40-2, . . . , 40-M) may be provided and adjusted at a digital radio interface DRI (200). Furthermore the present disclosure provides various computer programme product implementing the various aspects.

Abstract: Disclosed herein, among other things, are methods and apparatus for wireless interference diagnostic hearing assistance device systems. One aspect of the present subject matter includes a method for assessing and mitigating wireless interference for hearing assistance device programmers. The method includes measuring wireless interference over wireless communication channels using a wireless programmer configured to communicate with a hearing assistance device. A graphical display in communication with the wireless programmer is used to assist or direct a user to physically move the wireless programmer or the hearing assistance device to minimize the measured wireless interference. In various embodiments, the measured wireless interference is used to identify a source of the wireless interference, and an identity of the source of the wireless interference is displayed on the graphical display.

Abstract: A method (400) and apparatus (300) for selecting one of a plurality of antennas (320, 322), on a UE (300) implementing transmit diversity in a multi-carrier wireless communication system, for the joint transmission of two or more uplink signals, each modulated onto a different carrier frequency, such as when the carriers share a power amplifier (314). The method (400) and apparatus (300) select an antenna (320, 322) based on channel conditions associated with the carriers, even when prior art transmit diversity methods provide conflicting antenna selection indications.

Abstract: A method and a network node (110) for determining an indication of interference mitigation in a receiver comprised in a user equipment (120) are provided. The network node (110) receives, from the user equipment (120), a first set of measures and a second set of measures. The first set of measures relates to a signal received by the user equipment (120) and the second set of measures relates to the same signal. The first set of measures was obtained by the user equipment (120) prior to processing of the signal in the receiver, and the second set of measures was obtained by the user equipment (120) after processing of the signal in the receiver. Next, the network node (110) determines (202) the indication of interference mitigation based on the first and second sets of measures.

Abstract: Provided is an antenna apparatus equipped with a single RF chain. The antenna apparatus includes: a combiner configured to divide omnidirectional space into N sectors to perform a sector sweep, combine a reception signal received via the single RF chain for each sector and calculate a gain of a composite signal; a comparator configured to determine a gain magnitude of the composite signal; and a controller configured to perform a beam-forming according to a comparison result of the gain magnitude of the comparator.

Abstract: Methods and apparatus for enforcing codebook properties (e.g., constant modulus and/or finite alphabet) in adaptive and dual-stage codebooks are described. One example method generally includes receiving multiple feedback aspects of a channel for wireless communications determining multiple codewords based on the multiple feedback aspects, determining a final precoding matrix based on the multiple codewords, enforcing at least one codebook property in at least one of the multiple codewords or the final precoding matrix, applying the final precoding matrix to a plurality of spatial streams to form precoded spatial streams, and transmitting the precoded spatial streams. For certain aspects, enforcing the at least one codebook property includes quantizing elements in each of the multiple codewords and/or the final precoding matrix to the nearest value in a finite alphabet or to increase a performance metric.

Abstract: A method includes receiving a signal including a two-dimensional signal pattern in a time-frequency representation, wherein the two-dimensional signal pattern includes a first reference signal at a predetermined first position in the two-dimensional signal pattern and at least one second reference signal at a predetermined second position in the two-dimensional signal pattern. The first reference signal includes cell identification information of a target cell of a cellular radio system and the at least one second reference signal includes cell identification information of at least one interfering cell of the cellular radio system. The method further includes determining a first noise covariance measure based on the first reference signal, determining at least one second noise covariance measure based on the at least one second reference signal, and mitigating an interference included in the received signal based on the first noise covariance measure and the at least one second noise covariance measure.

Abstract: A transmission method of simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals. One of signal generation processing in which phase change is performed and signal generation processing in which phase change is not performed is selectable, thereby improving general versatility in signal generation.

Abstract: A first microwave backhaul transceiver may comprise a plurality of antenna elements. The transceiver may determine atmospheric conditions between it and one or more potential link partners, and adjust a radiation pattern of the plurality of antenna elements based on the determined atmospheric conditions. A first radiation pattern of the plurality of antenna elements may correspond to a first microwave backhaul link between the first microwave transceiver and a second microwave backhaul transceiver. A second radiation pattern of the plurality of antenna elements may correspond to a second microwave backhaul link between the first microwave transceiver and a third microwave backhaul transceiver. The transceiver may adjust the radiation pattern based on characteristics of data to be transmitted, and based on a routing table it maintains.

Abstract: Apparatuses and methods for maintaining an optimal beam direction in a wireless communication system are provided. The method for operating a receiving node in a wireless communication system includes, determining a first transmission beam is determined as a preferred transmission beam using a plurality of reference signals transmitted by a transmitting node, generating preferred transmission beam information, transmitting the preferred transmission beam information to the transmitting node, receiving transmissions from the transmitting node via the first transmission beam, and determining whether a change of a transmission beam is necessary. When the change of the transmission beam is determined to be necessary, generating a beam change request and transmitting the beam change request to the transmitting node.

Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data corresponding to each of a plurality of data transmission units, an encoder for encoding physical signaling data by a shortening scheme and a puncturing scheme, a mapper for mapping the encoded service data onto constellations, a frame builder for building at least one signal frame including preamble data, a modulator for modulating the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a transmitter for transmitting the broadcast signals carrying the at least one modulated signal frame.

Abstract: A method and an apparatus and for transmitting downlink Hybrid Automatic Repeat request (HARQ) information in a wireless communication system are provided. In the method, at least one Physical Resource Block (PRB) for transmitting a Physical HARQ Indicator Channel (PHICH) signal is set among all PRBs forming an available frequency band. A PHICH resource is determined within the set at least one PRB. A PHICH signal is transmitted using the determined PHICH resource.

Abstract: A method and an apparatus for utilizing multiple carriers are disclosed. A wireless transmit/receive unit (WTRU) capable of receiving on a single downlink carrier at a time may tune the receiver to one downlink carrier and switch the downlink carrier in accordance with a configured pattern. The WTRU may switch the carrier from an anchor carrier to a non-anchor carrier at a high speed shared control channel (HS-SCCH) sub-frame boundary, and switches back at an end of a subsequent high speed physical downlink shared channel (HS-PDSCH) subframe. The WTRU may switch the carrier at an HS-PDSCH sub-frame boundary. A WTRU capable of receiving on multiple downlink carriers simultaneously may tune the receiver to an anchor carrier and a supplementary carrier, and switch the supplementary carrier to another carrier based on a carrier switching order. The carrier switching order may be received via an HS-SCCH or via layer 2 signaling.

Abstract: An integrated duplexer and combiner in a telecommunication system, such as a cross-polarized antenna system, is disclosed. An integrated duplexer and combiner may result in a reduction in the number of transmit filters used. A transmit filter may be coupled to two receive filters through a transmission network that provides isolation between the two receive signal paths and, at the same time, provide power splitting of transmitter power to two duplexed transmit signal paths. The transmission network includes first and second ?/4 transmission lines coupled between inputs of the two receive filters. A third ?/4 transmission line couples the first and second ?/4 transmission lines to an output of the transmit filter. The two receive filters may have the same passband, while the transmit filter may have a different passband.

Abstract: A transmission method of simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals. One of signal generation processing in which phase change is performed and signal generation processing in which phase change is not performed is selectable, thereby improving general versatility in signal generation.

Abstract: User Equipment (UE) selects a Sounding Reference Signal (SRS) pattern and transmits orthogonal frequency-division multiplexing (OFDM) symbols according to the selected SRS pattern. The OFDM communication system wirelessly receives data from the UE and processes the data to detect the OFDM symbols. The detected OFDM symbols are processed to identify the selected SRS pattern. An impulse response matrix is generated based on the selected SRS pattern. Additional data based on the impulse response matrix can be transferred to the UE.

Abstract: From the network perspective, an uplink resource allocation (PDCCH) is sent that grants an uplink resource to a plurality of user equipments UEs, and the allocation has an indication of a cyclic shift CS for each of the plurality of UEs. The granted uplink resource is mapped to a downlink resource (PHICH) in dependence on the indicated CS for each of the plurality of UEs. The mapping is such that for a predetermined number of UEs being allocated a same uplink resource in a single MU-MIMO uplink resource allocation grant, each pair of said predetermined number of UEs which map to an adjacent downlink resource exhibit an optimized CS relative to one another. The network sends to each of the respective plurality of UEs on the respective mapped downlink resource an indication (ACK/NACK) about data received (on a PUSCH). Apparatus, method, and computer programs for network and UE side implementations are detailed.

Abstract: The present disclosure relates to scheduling of radio resources by a radio network node to a UE located in a wireless communications network. The UE is being served by the network node and is determined to have enough priority The present disclosure relates scheduling of radio resources by a radio network node to a UE located in a wireless communications network. The UE is being served by the network node and is determined to have enough priority weight for being scheduled in downlink. UE Channel State Information (CSI) is retrieved and a determination is made whether the retrieved CSI is unreliable, and when unreliable, retrieving a Scheduling Delay Time (SDT) representing a time for which the network node is allowed to delay a scheduling of radio resources to the UE.

Abstract: Radio devices for wireless transmission including an integrated adjustable mount allowing mounting to a pole or stand and adjustment of the angle of the device (e.g., the altitude). The device may include a compact array antenna having a high gain configured to operate in, for example, the 5.15 to 5.85 GHz band and/or the 2.40-2.48 GHz band. The antenna emitters may be arranged in a separate plane from a plane containing the antenna feed connecting the emitting elements and also from a ground plane. The antenna array may be contained within a protective weatherproof housing along with the radio control circuitry.

Abstract: There is provided a method for determining a radiation beam pattern. The method is performed by a network node. The method comprises transmitting probe signals, the probe signals being orthogonal to cell-specific reference signals (CRS) transmitted by the network node. The method comprises receiving responses to the probe signals from wireless devices, wherein each response comprises a measurement report based on reception of the transmitted probe signals at each wireless device. The method comprises determining a radiation beam pattern based on the received measurement reports.

Abstract: A method and apparatus has been developed to reduce SAR for a mobile device by designing appropriate matching circuits between each antenna and its power amplifier. In the presence of such matching circuits the normal phase adjustments may be carried out to provide a preferred safe SAR level that can be maintained during phase adjustment without sacrificing TRP.

Abstract: A system, apparatus, and method use full duplexing with polarization. A wireless communication system includes a first transceiver configured to transmit and receive wireless signals to and from at least a second transceiver. The first transceiver includes a plurality of transmitter antennas and a plurality of receiver antennas. At least one of the transmitter antennas is configured to transmit a first signal with a first polarization weight to at least the second transceiver. At least one of the receiver antennas is configured to receive a second signal with a second polarization from the second transceiver. The second polarization is cross polarized with the first polarization.

Abstract: A system for communicating with wireless devices. The systems includes radio groups whose MIMO physical sectors overlap. The MIMO physical sectors communicate using different channels. The MIMO physical sectors overlap to form an area of overlap. Each radio group includes directional antennas and radios. Radios are selectively coupled to the antennas. The antennas that are oriented so that the physical sectors of the antennas overlap to operate as MIMO antennas and form the MIMO physical sector for the radio group. The antennas operate as a MIMO antenna.

Abstract: A method for transmitting a signal to a receiver by a transmitter in a multiple input multiple output (MIMO) wireless communication system is disclosed. A method for transmitting a signal to a receiver by a transmitter in a multiple input multiple output (MIMO) wireless communication system includes: generating at least one bit stream by channel-coding data; allocating a first bit stream having a specific size from among the bit streams to an antenna sequence codeword according to an antenna sequence codebook; and transmitting the remaining second bit stream from among the bit streams to the receiver according to the order of antenna pairs indicated by the allocated antenna sequence codeword, wherein the antenna sequence codebook indicates a mapping relationship between the first bit stream and the antenna sequence codeword, and the antenna sequence codeword is defined by two timeslots and two antenna indexes.

Abstract: The present invention relates to a wireless network, and more specifically, to a method and apparatus for partitioning a coordination area in a wireless network, the method comprising: obtaining antenna directions of respective cells, base station locations of respective cells, and scope of a coordination area within the wireless network; determining an initial coordination area based on the scope of the coordination area and the base station locations in respective cells; partitioning the initial coordination area into an inner area and an outer area; partitioning the outer area into an inward area and an outward area based on the antenna directions of cells within the outer area and the base station locations of cells within the outer area; and combining the inner area and the inward area within the outer area into a new coordination area. The method is simple and easy.

Abstract: A system and method for the management of client computing device DNS queries and subsequent resource requests within a content delivery network service provider domain are provided. The management of the DNS queries can include the selection of computing devices corresponding to various Point of Presence locations for processing DNS queries. Additionally, the management of the content requests can include the selection of computing devices corresponding to resource cache components corresponding to various Point of Presence locations for providing requested content. The selection of the computing devices can incorporate logic related to geographic criteria, testing criteria, and the like.

Abstract: Methods, apparatuses, and systems relating to narrow beam communications and wireless networking are disclosed. Exemplary methods for wireless networking and communications may include identifying a geographic area, receiving location data relating to the geographic area, receiving network performance data, analyzing the location data and the network performance data, identifying a first access point in the geographic area based at least in part on the analyzing, and adjusting a narrow beam communication device a predetermined amount relating to the first access point based at least in part on the analyzing.

Abstract: A base station includes an antenna, a sending unit, a monitoring unit, and a controlling unit. The antenna is configured to be operated corresponding to a communication area of the base station, the antenna being capable of controlling a tilt angle, the tilt angle being an angle made by a vertical direction and a direction of a main beam of the antenna. The sending unit is configured to send a command corresponding to adjustment of timing of sending a signal sent from a mobile station. The monitoring unit is configured to monitor the number of mobile stations present in the communication area by using the command. The controlling unit is configured to reduce the tilt angle when the number of mobile stations exceeds an upper limit allowed to be contained in the communication area.

Abstract: Disclosed herein are a method of beamforming and a 3D antenna array. The method includes: transmitting a first control channel; receiving first feedback information on a first antenna set and a first precoding scheme of a plurality of antenna sets included in the 3D antenna array, which are determined based on the first control channel, from a first communication node different from the communication node; and beamforming a traffic channel to be transmitted to the first communication node using the first antenna set and the first precoding scheme.

Abstract: In accordance with the exemplary embodiments there is at least a method and apparatus to operations including determining, by a communication device, parameters for each of at least one interfering radio signal of a communication signal received by one or more antenna of the communication device; and based on the determined parameters, at least one of suppressing and cancelling the at least one interfering radio signal from the communication signal by the communication device.

Abstract: A phased-array transceiver includes: a plurality of antennas; a plurality of transceiving elements respectively coupled to the plurality of antennas; a signal processing block; and a first distributed network, coupled between the signal processing block and the transceiving elements, wherein the transceiving elements, the signal processing block, and the first distributed network are configured as a single chip, and a first transceiving path between one of the plurality of transceiving elements and the signal processing block and a second transceiving path between another of the plurality of transceiving elements and the signal processing block share at least partial signal traces of the first distributed network.

Abstract: Methods and apparatuses for wireless communication are provided. In an aspect, the method includes receiving a plurality of channel quality reports based on a multiple description coding schedule and determining a transmission parameter based on the plurality of channel quality reports. In another aspect, the method includes receiving a family of codebooks organized based on a transmission rank, and reporting, using a multiple description coding scheme, a channel quality parameter using a codebook entry from the family of codebooks.

Abstract: Disclosed is a printed antenna which includes: a ground plane which is a layer of metal formed on the insulating layer; a feed unit which is multiple metallic lines formed on the insulating layer and includes a first end and a second end; a feed point which is set between the feed unit and the ground plane and is connected to the first end of the feed unit; a first radiation unit which is formed on the insulating layer, and configured to radiate or receive first frequency band signals; a second radiation unit which is formed on the insulating layer, connected to the second end of the feed unit, and configured to radiate or receive second frequency band signals; a third radiation unit, which is formed on the insulating layer, connected to the second end of the feed unit, and configured to radiate or receive third frequency band signals.

Abstract: An object discovery capability is provided to enable discovery of objects in a wireless environment, which may include discovering objects available from a set of wireless nodes in a wireless environment. The discovery of objects available from a set of wireless nodes may include a determination as to whether a particular object is available from the set of wireless nodes, identification of the wireless node or nodes from which a particular object is available, or the like. The object discovery capability may leverage physical features of the wireless medium (namely the additive nature of wireless signals in a Hertzian broadcast channel) in combination with set reconciliation techniques (e.g., using data encoding structures, such as Bloom filters, with information at the physical layer or one or more other layers) in order to enable discovery of objects available from a set of wireless nodes in a wireless environment.

Abstract: A software application and system that enables point-and-click interaction with a TV screen. The application determines geocode positioning information for a handheld device, and uses that data to create a virtual pointer for a television display or interactive device. Some embodiments utilize motion sensing and touchscreen input for gesture recognition interacting with video content or interactive device. Motion sensing can be coupled with positioning or localization techniques the user to calibrate the location of the interactive devices and the user location to establish and maintain virtual pointer connection relationships. The system may utilize wireless network infrastructure and cloud-based calculation and storage of position and orientation values to enable the handheld device in the TV viewing area to replace or surpass the functionality of the traditional TV remote control, and also interface directly with visual feedback on the TV screen.

Abstract: Methods and apparatus to mitigate coexistence interference among multiple wireless subsystems and wired connection ports of a computing device are described. A processor obtains configurations for at least two wireless subsystems and for a connection state of at least one wired connection port. When the first and second wireless subsystem configurations or the connection state of the at least one wired connection port indicate potential or actual coexistence interference, the processor is configured to adjust wireless circuitry of the first and second wireless subsystems. The first wireless subsystem is configured based on frequency bands used by the first and second wireless subsystems, while the second wireless subsystem is configured based on the connection state. In an embodiment, the first wireless subsystem operates in accordance with a wireless personal area network protocol, and the second wireless subsystem operates in accordance with a wireless local area network protocol.

Abstract: A device for forming a beam of an antenna array, the device including: an antenna array having a plurality of spatially distributed elements; a processor for selectively switching said elements between first and second states wherein, in said first state, said elements are configured to receive an incoming signal; and a receiver operatively associated with said antenna array and said processor for generating a reference signal, mixing said incoming signal with a modified reference signal to generate a mixed signal and summing the mixed signal over a predetermined period to generate an accumulated signal, wherein said reference signal is modified prior to being mixed with said received signal such that said accumulated signal is indicative of the direction and magnitude of the beam of the antenna array.

Abstract: In one embodiment, a first communication is transmitted from a transmitting node in a network using a mesh routing protocol. The first communication is received at a particular node in the network. Based on the first communication, a directional attribute is computed. Based on the directional attribute, a particular direction is computed. Then, a second communication is transmitted from the particular node using a beam forming technique in the second direction.

Abstract: An access point and a method for transmitting data through an access point are disclosed, In one embodiment the access point includes a MAC processor configured to process and output a single transmit data stream, and a physical layer (PHY) processor configured to split the single transmit data stream in a plurality of transmit data streams, the physical layer (PHY) processor further configured to process a first group of one or more channel paths for the first set of one or more transmit data streams according to the first mode of operation and a second group of one or more channel paths for the second set of one or more transmit data streams according to the second mode of operation.

Abstract: The present invention relates to a method, of operating a base station (100) of a cellular communications network, wherein said base station (100) comprises at least one antenna (110), said method comprising a step of adjusting (200) a tilt angle (?) of the antenna (110) and/or of a beam pattern of said antenna, wherein said step of adjusting (200) is performed depending on a quality measure which characterizer the quality of a signal transmission associated with said antenna (110).

Abstract: A target cell extracting unit extracts a handover destination cell of a wireless communication terminal. A target cell notifying unit notifies first HO preparation information, which is information for handover of the wireless communication terminal including information about the handover destination cell, to an eNB accommodating the handover destination cell. A subsequent candidate cell notifying unit receives, from the eNB, information about a subsequent candidate cell, and notifying second HO preparation information including the information about the subsequent candidate cell to the eNB. A subsequent candidate cell extracting unit obtains the information about the handover destination cell from the received first HO preparation information, and extracts the subsequent candidate cell based on a state between the handover destination cell and another cell in wireless communication. A subsequent candidate cell notifying unit notifies the information about the subsequent candidate cell to the eNB.

Abstract: The present invention provides a method and device for calibrating antenna reciprocity via OTA in a base station of wireless network, and the method comprises: determining, based on a predefined rule, a plurality of calibrating UEs out of a plurality of UEs, and antennas, to be calibrated by the plurality of calibrating UEs, of the plurality of base stations, wherein the plurality of calibrating UEs are configured to calibrate antennas of the plurality of base stations; and calibrating, according to the determined calibration relationship, the antennas reciprocity of the plurality of base stations based on the plurality of calibrating UEs. With the method of present invention, communication channel model can be calibrated effectively so as to enhance antenna reciprocity in CoMP scenario.

Abstract: Provided are a method of transmitting a signal of a multi-node system. The method includes: transmitting a first signal to a user equipment via the plurality nodes by applying a first power factor; receiving power feedback information as a feedback from the user equipment; and transmitting a second signal to the user equipment via at least one node among the plurality of nodes by applying a second power factor, wherein the first power factor and the second power factor are elements for determining transmit power to be applied to the plurality of nodes, wherein the power factor information includes information for transmit power applicable to each of the plurality of nodes by measuring the first signal, and wherein the second power factor is determined based on the power factor information.

Abstract: The invention relates to millimeter-wave point-to-point communication systems. A system comprises two separated millimeter-wave transceivers which provide high throughput data transmission and reception in frequency duplex mode and use high gain antennas capable of electronic scanning in some continuous angle range provided by the control module that implement control algorithms for antenna radiation pattern. Also a method based on the exploitation of scanning antennas of initial beam directions fine adjustment and subsequent beam directions tracking and readjustment when needed is proposed. The proposed system and method provide automatic recovery of failed connection in case of relay station orientation change due to influence of various external factors (wind, vibration, different intensity of heating of the bracing mountings at different time of a day and others) and can be used in backhaul systems of base station sites for mobile networks.