Patent application number | Description | Published |
20100260103 | Distributed Antenna System - A wireless communication network employs a distributed antenna system to provide radio coverage. The wireless communication network comprises a plurality of access points providing service in respective coverage areas. The access point within each coverage area connects to a plurality of antennas that are widely distributed within the coverage area. Radio resources at antennas within the overlapping region of two or more neighboring coverage areas are shared by the access points in the neighboring coverage areas according to a multiple access scheme. The sharing of radio resources within the overlapping region of two or more coverage areas allows the overlapping region to be enlarged, thereby providing more time to complete a handover. | 10-14-2010 |
20100278047 | System and Method for Parameter Estimation with Interference Suppression in a Telecommunications Network - A system, method and node of implementing interference suppression for estimation of a signal parameter of a base station transmission at a User Equipment (UE) in a telecommunications network with irregular reference signal patterns assigned to base stations. A list of base stations for which a parameter of the transmitted signal is to be estimated and a list of OFDM symbols and subcarriers to avoid for each base station are compiled. The compiled list is sent to the UE, which performs measurements for each base station using the received measurement information and simple interference avoidance is performed utilizing OFDM symbols and subcarriers not on the list of OFDM symbols and subcarriers to avoid. The measurements are then sent to the network. | 11-04-2010 |
20110256901 | POWER CONTROL IN A COORDINATED MULTIPOINT SYSTEM - A Coordinated Multipoint (CoMP) controller advantageously reduces the transmit powers of transmissions coordinated across a plurality of sub-cells within a CoMP cell. The CoMP controller determines serving sub-cell path gains and interfering sub-cell path gains for a set of mobile terminals to be served by distinct sub-cells. The CoMP controller then evaluates an objective function that expresses an aggregate throughput of concurrent transmissions to be sent to or received from the set of mobile terminals as a function of the serving sub-cell path gains, the interfering sub-cell path gains, and the individual transmit powers of those transmissions, to determine the combination of individual transmit powers that maximizes the aggregate throughput while meeting minimum quality of service requirements for the mobile terminals. The combination of individual transmit powers will necessarily require less power than if the concurrent transmissions were each sent at maximum transmit power. | 10-20-2011 |
20110263280 | SELF-CALIBRATING MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM - A large scale, self-calibrating multi-antenna wireless communication system calibrates the transmit-receive RF chains of antennas in the system. The system, during a first time interval, transmits a pilot signal from at least those antennas in a first time-reuse group, so that the pilot signals are received at antennas in one or more other time-reuse groups. The system, during a second time interval, transmits a pilot signal from at least those antennas in a second time-reuse group, so that the pilot signals are received at antennas in one or more other time-reuse groups. The system also, during a third time interval, transmits a pilot signal from at least those antennas in a third time-reuse group, so that the pilot signals are received at antennas in one or more other time-reuse groups. Based on these received pilot signals, the system calculates RF-chain calibration factors for one or more of the antennas. | 10-27-2011 |
20110275397 | Uplink Reference Signal Allocation and Assignment for Cell Clusters - The inventive methods and apparatus disclosed herein allocate and assign uplink reference signals to cells ( | 11-10-2011 |
20110280181 | CYCLIC PREFIX FOR NON-CONTIGUOUS SIGNAL TRANSMISSION - Transmitted signals are modified to facilitate the emulation of circular convolution in non-contiguous transmission environments. These modified signals may be derived from well-known signature sequences. In an exemplary method, a tail portion of a final segment of a base signal is prefixed to an initial segment of the base signal, to form a first transmit segment. One or more additional transmit segments are formed by prefixing, to each of the one or more segments of the base signal other than the initial segment, a tail portion of the immediately preceding segment of the base signal. The transmit segments so formed are transmitted in respective ones of the plurality of non-contiguous transmit-time intervals. Corresponding methods for receiving the transmitted segments and reconstructing the base signal are also described, as are corresponding transmitting and receiving apparatuses. | 11-17-2011 |
20120122462 | DISTRIBUTED SCHEDULING COORDINATION FOR PLURAL SERVICE AREAS - An apparatus ( | 05-17-2012 |
20120230691 | METHOD OF DOWNLINK SIGNAL TRANSPORT OVER BACKHAUL COMMUNICATIONS THROUGH DISTRIBUTED PROCESSING - The amount of multi-antenna signals to be transmitted over the backhaul in a Coordinated MultiPoint (CoMP) system from the central processor (CP) to each base station is reduced. Embodiments of the present invention exploit characteristics of the underlying signal structure, and distribute some baseband processing functionalities—such as channel coding and the application of the multi-user precoding—from the CP to the remote base stations. Additionally, in some embodiments the non-precoded parts of multi-antenna signals are broadcast from the CP to all base stations in the CoMP system, to further reduce the burden on backhaul communications. In one embodiment, the backhaul network is a Gigabit-capable Passive Optical Network (GPON). | 09-13-2012 |
20120236774 | JOINT MANAGEMENT OF RADIO AND TRANSPORT RESOURCES - A system for managing radio access resources includes a joint radio resource management/transport resource management unit configured to communicate with a plurality of radio units over a transport network, to jointly allocate radio resources at the radio unit and transport resources on the transport network in response to requests from wireless terminals requesting access to radio resources from the radio units, to send a radio resource allocation schedule to the plurality of radio units that defines radio resource allocations for the wireless terminals, and to generate a transport resource allocation schedule that defines transport resource allocations for the wireless terminals. The system further includes a transport resource controller configured to receive the transport resource allocation schedule and to map user data to physical transport resources on the transport network in response to the transport resource allocation schedule. | 09-20-2012 |
20120243468 | SIGNAL COMPRESSION FOR BACKHAUL COMMUNICATIONS USING LINEAR TRANSFORMATIONS - A compression/decompression method for backhaul communication of a complex-valued radio signal between base stations and the network processing unit, such as a Central Processor of a Coordinated MultiPoint (CoMP) system, significantly reduces backhaul bandwidth. The spatial and temporal correlations of the wireless IQ signal are exploited in order to remove redundancy and substantially reduce signal bandwidth. Feature component signals of significance are extracted through linear transformation to form the radio signal, and are individually quantized, possibly at different bit rates in accordance with their relative importance. The transformation can either be pre-determined or computed in real-time based on the spatial and temporal statistics of the radio signal. In the latter case, the transformation matrix or matrices are also sent over the backhaul in order to allow the radio signal to be reconstructed at the receiving end. Different methods of generating the transformation matrices are proposed. | 09-27-2012 |
20120244898 | DYNAMIC, DISTRIBUTED COORDINATION OF PARAMETERS IN A CELLULAR TELECOMMUNICATION NETWORK - An apparatus, system, and method for dynamic, distributed coordination of parameters between a plurality of base stations in a cellular telecommunication network. An inter-cell communication interface connecting each given base station with the given base station's neighboring base stations is extended to communicate parameter settings between the given base station and the neighboring base stations. An apparatus in each given base station receives from the given base station's neighboring base stations, parameter settings being utilized by the neighboring base stations for transmitting and/or receiving in associated neighboring cells. The apparatus utilizes the parameter settings received from the neighboring base stations as factors to determine local parameter settings for the given base station. The given base station then sends the local parameter settings and supplemental information to the neighboring base stations so that optimal network-wide parameter settings can be selected. | 09-27-2012 |
20120288022 | CHANNEL ESTIMATION FOR A VERY LARGE-SCALE MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEM - A transmitter, receiver, and method for channel estimation for a Multiple-Input Multiple-Output (MIMO) communication system in which the transmitter includes a multiplicity of transmit antennas spaced such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level. The transmitter selects a subset of the multiplicity of transmit antennas for transmitting the pilot reference signals. The pilot reference signals are transmitted only from the selected subset of transmit antennas to the receiver. The receiver includes a channel estimator configured to derive a channel estimation for all of the multiplicity of transmit antennas using the received pilot reference signals and known or estimated spatial correlation among the multiplicity of transmit antennas. | 11-15-2012 |
20120307818 | CYCLIC PREFIX FOR NON-CONTIGUOUS SIGNAL TRANSMISSION - Transmitted signals are modified to facilitate the emulation of circular convolution in non-contiguous transmission environments. These modified signals may be derived from well-known signature sequences. In an exemplary method, a tail portion of a final segment of a base signal is prefixed to an initial segment of the base signal, to form a first transmit segment. One or more additional transmit segments are formed by prefixing, to each of the one or more segments of the base signal other than the initial segment, a tail portion of the immediately preceding segment of the base signal. The transmit segments so formed are transmitted in respective ones of the plurality of non-contiguous transmit-time intervals. Corresponding methods for receiving the transmitted segments and reconstructing the base signal are also described, as are corresponding transmitting and receiving apparatuses. | 12-06-2012 |
20130017855 | DISTRIBUTED BEAM SELECTION FOR CELLULAR COMMUNICATIONAANM HUI; DennisAACI SunnyvaleAAST CAAACO USAAGP HUI; Dennis Sunnyvale CA USAANM Guey; Jiann-ChingAACI FremontAAST CAAACO USAAGP Guey; Jiann-Ching Fremont CA US - A group of multiple base stations implements distributed and coordinated antenna beamforming selection to achieve increased performance. Each of the base stations in the group determines an associated optimal set of antenna beam direction parameters in a distributed manner based on local radio information exchanged between neighboring ones of the base stations. Each of the base stations transmits to one or more user equipments (UEs) served by that base station using its associated optimal set of beam direction parameters. The local radio information generated by one of the base stations indicates how the transmissions of its neighbor base stations affect the performance of the base station. The performance of a base station may be measured by the difficulty or challenge in maintaining a minimum desired signal quality, e.g., a minimum SINR, for the UE served by the base station. | 01-17-2013 |
20130072131 | Method, Apparatus and System For Choosing a Parameter Setting From a Set of Available Parameter Settings - A system comprises a communication device that chooses a parameter setting from a set of available parameter settings. The system may include multiple communication devices, and each available parameter setting may have an associated cost. The communication device may receive parameter setting information from one or more other communication devices in the system, and the parameter setting information may identify the parameter setting being used by the one or more communication devices in the system. The communication device may choose a parameter setting that is associated with the lowest cost based on the parameter setting information received from the one or more other communication devices in the system. | 03-21-2013 |
20130077658 | SPATIALLY RANDOMIZED PILOT SYMBOL TRANSMISSION METHODS, SYSTEMS AND DEVICES FOR MULTIPLE INPUT/MULTIPLE OUTPUT (MIMO) WIRELESS COMMUNICATIONS - Compressive sampling is used to generate pilot symbols to be transmitted over an array of antennas in a MIMO wireless communications device. A pilot symbol is transmitted over the array of antennas according to a spatially randomized antenna transmission function that randomly changes across the array of antennas. The randomized antenna transmission function may randomly select/deselect antennas and/or randomly change amplitude and/or phase of the pilot symbol transmission. Channel estimates can be constructed at a receiver based on the spatially randomized pilot symbols that were transmitted. | 03-28-2013 |
20130089065 | Time and Frequency Synchronization - The scheduling flexibility of CSI reference signals enables time and frequency synchronization using multiple non-zero CSI-RSs transmitted in the same subframe, or using CSI-RSs transmitted in the same subframe with other synchronization signals. Also, multiple synchronization signals may be scheduled in the same subframe to enable fine time and frequency synchronization without cell-specific reference signals. | 04-11-2013 |
20130109421 | Adaptation of Parameters in a Communication Network | 05-02-2013 |
20130114468 | DYNAMIC SPACE DIVISION DUPLEX (SDD) WIRELESS COMMUNICATIONS WITH MULTIPLE ANTENNAS USING SELF-INTERFERENCE CANCELLATION - A system and method to perform Full Duplex (FD) Space Division Duplex (SDD) communication using a Self-Interference Cancelling (SIC) precoder that applies different antenna phase shifts and amplitude scales to the transmitted signals to force them to be in the null space of the selected receive antennas. Thus, a wireless communication unit can place nulls at each of its receive antennas digitally at baseband for one or more frequency bands. The SIC precoder may be computed based on the self-interference channel from the transmit chain(s) to the receive chain(s). Different SIC precoders may be adaptively selected and stored digitally for different frequency bands. Subsequent single or multi-user precoder can be applied in concatenation with the SIC precoder to transmit signals to one or more users while receiving signals from one or more users simultaneously over the same frequency band. | 05-09-2013 |
20130128785 | ENERGY EFFICIENT OPERATION FOR DENSE DEPLOYMENT OF WIRELESS ACCESS NODES - Systems and methods are disclosed for providing energy efficient operation for wireless access nodes in a dense deployment of wireless access nodes in a cellular communication network. In one particular embodiment, wireless access nodes form a super dense network. In one embodiment, a wireless access node in a dense deployment of wireless access nodes in a cellular communication network includes a transmitter and a receiver that are operated according to a discontinuous transmit and a discontinuous receive mode of operation. The wireless access node controls one or more duty cycles for the discontinuous transmit and discontinuous receive mode of operation based on an alertness state of the wireless access node. In one embodiment, the one or more duty cycles increase as the alertness state of the wireless access node increases. In this manner, the wireless access node is operated in an energy efficient manner. | 05-23-2013 |
20130142078 | SYSTEMS AND METHOD FOR GRAPH-BASED DISTRIBUTED PARAMETER COORDINATION IN A COMMUNICATION NETWORK - Systems and method are disclosed for graph-based distributed parameter coordination in a communication network. In general, discrete local parameters to be coordinated among communication nodes in the network and their respective performance metrics, or costs, are modeled using a factor graph. Based on the factor graph, a variant of the sum-product algorithm, namely the min-sum algorithm, is applied in order for the communication nodes, through iterative message passing with their neighboring communication nodes, to decide upon optimal values for the local parameters for the communication nodes that collectively optimize a global performance metric across the communication network. In one embodiment, the communication network is a wireless communication network. In one specific embodiment, the wireless communication network is a cellular communication network. | 06-06-2013 |