Patent application number | Description | Published |
20080279125 | Method, a Device and a System For Duplex Communications - A method, a device, and a system for duplex communications. Uplink and downlink frequencies are allocated in an orthogonal manner such that at one time instant a certain carrier frequency is used for uplink (downlink) transmission and at some other time instant for downlink (uplink) transmission. Correspondingly, at said one time instant a second carrier frequency is used for downlink (uplink) transmission and at said some other time instant optionally for uplink (downlink) transmission. | 11-13-2008 |
20080317104 | Linear transformation matrices for distributed diversity - A signal for relay is received from a first node. From a local memory that stores K transform matrices (K being an integer greater than one) is selected a transform matrix that is associated with a relay rank order. The matrices define an optimal tradeoff of diversity gain versus spatial multiplexing. The received signal is transformed using the selected transform matrix, and the transformed signal is relayed over a wireless channel to a second node. In a particular embodiment the received signal is an input symbol vector of N consecutive symbols (N being an integer at least equal to two) and the transform linearly combines the N symbols of the input vector according to the relay rank order. In various embodiments the first node may give the rank order, it may be mutually agreed via signaling among the various relay nodes, or it may be based on an intrinsically generated random number. | 12-25-2008 |
20090092073 | Cooperative relay system enabling simultaneous broadcast-unicast operation with efficient automatic repeat request functionality - A wireless node, such as a relay node, has different operating modes for unicast and broadcast/multicast subchannels. For unicast services the phase offsets of those relay nodes engaged in a cooperative transmission are optimized for the subchannels used for unicast services. Alternatively, when no feedback is available and an open loop MIMO or MIMO-type scheme is in use, retransmissions are performed in such a way that a destination (e.g., user terminal) receives effectively a distributed space-time block code. For the broadcast/multicast services time varying random phase offsets may be employed for the subchannels used for broadcast services. For reliable high data rate broadcast transmissions a cooperative retransmission scheme that effectively forms distributed space-time block codes may be used. | 04-09-2009 |
20090143008 | Apparatus, method and computer program product for determining transmit weights in relay networks - Apparatus, methods and computer program products implement a channel-aware approach for controlling a relay network operative in a wireless communications system wherein weighting matrices are used at a MIMO-capable source electronic device and at the relays where at least one of the weighting matrices is selected or derived using knowledge of channel components of at least one channel link, where the channel link may be from the relays to the destination antennas of the destination device; or from source antennas of the MIMO-capable source device to the relays, or from the source antennas of the MIMO-capable source device to the destination antennas of the destination device. In one approach weighting matrices applied at the source and relay nodes are selected from a predetermined codebook of weighting matrices in dependence on monitored channel conditions. Alternatively, the weighting matrices may be determined using an eigenvalue decomposition and power allocation (e.g., water-filling) approach by using the effective channel correlation matrix possibly combined with the use of the noise correlation matrix. | 06-04-2009 |
20090175160 | Precoder Matrix for Multichannel Transmission - This invention describes a method for precoding in a transmitter utilizing a multichannel transmission, using a precoder for, e.g., M-QAM (M>4) modulated OFDM systems. The invention describes a new precoding method that is suitable for use, e.g., in an MB-OFDM UWB system especially when targeting for high data rates (above 480 Mbps). This may involve transmitting 16-QAM in place of 4-QAM symbols. The method could be adopted also for some future wireless LANs (local area networks), for future evolutions of 3G and for 4G systems. | 07-09-2009 |
20090175363 | Assignment of sub-channels to channels in a multi transmission-channel system - A method of allocating a set of sub-channels to a plurality of transmission channels in a multi transmission-channel system comprising the steps of; mapping a first, non-zero, set of sub-channels to a first transmission channel, mapping a second, non-zero, set of sub-channels to a second transmission channel, wherein at least one sub-channel of the first set and at least one sub-channel of the second set are allocated to one receiving unit. | 07-09-2009 |
20090296626 | Method, apparatus and computer program for relay selection - First are determined which relays are available between at least one source and at least one destination, and from them are selected a subset of those relays for an activation interval under a constraint of equal transmit energy per selected relay across the activation interval. A matrix is formed, using CSI received from the relays, to evaluate each effective channel between source and destination that goes through each of the relays, including multi-relay hops, and the relays are selected from that matrix. Utility of source-relay pairing is evaluated in view of the relay-destination channel and the pairing enables relays to multiplex multiple sources where feasible. | 12-03-2009 |
20090296788 | Closed-loop signalling method for controlling multiple transmit beams and correspondingly adapted transceiver devices - A closed-loop signalling method controls multiple transmit beams. The method also includes transmitting a plurality of beams from a first transceiver via a plurality of transmission channels to a second transceiver, evaluating, at the second transceiver, characteristics of the plurality of transmitted beams received at the second transceiver. The method also includes deriving, at the second transceiver, beamforming information for being fed back from the second transceiver to the first transceiver based on the evaluated characteristics. The beamforming information is usable for controlling, at the first transceiver, the transmitting of the plurality of beams. The method also includes selecting, at the second transceiver, at least one set of beamforming information for being fed back from the second transceiver via a feedback path to the first transceiver. The method also includes calculating, at the first transceiver, additional beamforming information which was not contained in the feedback path, based on the beamforming information being fed back. | 12-03-2009 |
20090312044 | Channel Estimation, Scheduling, and Resource Allocation using Pilot Channel Measurements - A wireless communication system is disclosed that includes forming one or more beam patterns by a transmitter at a first time, where the beam patterns are made up of a first set of beam patterns used to transmit data during the first time, and a second set of beam patterns used to transmit data during a subsequent time. A pilot signal is transmitted on each of the beam patterns and is detectable and decodable by one or more receivers. The receivers test the quality of the beam patterns and transmit an indicator to the transmitter that relates to one of the beam patterns that has a high channel quality. The transmitter determines channel estimation, transmission scheduling, and/or resource allocation based, at least in part, on the indicator. | 12-17-2009 |
20100009706 | Method for controlling the weighting of a data signal in the at least two antenna elements of a radio connection unit, radio connection unit, module and communications system - The invention relates to a method for controlling the weighting of a data signal in the at least two antenna elements of a first radio connection unit of a radio communications system, which data signal is to be distributed for parallel transmission to a second radio connection unit to at least two beams. In order to improved such a method, it comprises: determining in the second radio connection unit a weight information enabling the first radio connection unit to determine the sets of weights for suitable beams for transmission and transmitting it to the first radio connection unit; and distributing the data signal in the first radio connection unit to those sets of weights and transmitting the data signals simultaneously via the formed beams. Alternatively or additionally, the second unit determines the number of beams to be used and informs the first unit about it. The invention equally relates to corresponding radio connection units, radio connection unit modules and radio communications systems. | 01-14-2010 |
20100098187 | DIVERSITY TRANSMITTER AND DIVERSITY TRANSMISSION METHOD - The present invention concerns a diversity transmitter, comprising: transmit symbol input means ( | 04-22-2010 |
20100304666 | SYSTEM FOR DISTRIBUTED BEAMFORMING FOR A COMMUNICATION SYSTEM EMPLOYING RELAY NODES - In accordance with aspects of the present invention, a method, apparatus and system for learning antenna weighting factors in a communication system including relay nodes. In one embodiment, an apparatus (e.g., a relay node ( | 12-02-2010 |
20100331026 | Determination of coupling between radio devices - A method includes transmitting, from a radio device of a secondary communication system, a signal into a channel of a primary communication system; monitoring channel signal quality-related feedback of the primary system; determining, based on the monitored channel signal quality-related feedback, an amount of mutual coupling between the transmitted signal and the channel, if any, caused by the transmitted signal; and if the amount of determined mutual coupling is less than a threshold amount, using the channel for communication with another radio device of the secondary communication system. The signal that is transmitted may be a probing signal having at least a predetermined temporally varying transmission pattern, and where determining includes correlating at least the predetermined temporally varying transmission pattern with changes, if any, in the monitored channel signal quality-related feedback. The channel signal quality-related feedback that is monitored may include at least one of ACK/NACK feedback, power control feedback, rate control feedback and channel quality indicator feedback. | 12-30-2010 |
20110064018 | Apparatus and Method for Input/Output Mapping of Spatial Resources of a Relay Node in a Communication System - An apparatus and method for input/output mapping of spatial resources of a relay node in a communication system. In one embodiment, the apparatus includes a channel manager configured to identify a plurality of channels bearing signal streams from a source node to a plurality of destination nodes via a relay node having a plurality of antennas. The apparatus also includes a channel allocator configured to employ input/output mapping for a plurality of spatial resources of the relay node as a function of channel characteristics of the plurality of channels for the signal streams. | 03-17-2011 |
20110249573 | CHANNEL ACCESS FOR COGNITIVE NETWORKS - A system for managing wireless interaction based on communication performance. Source apparatuses may desire to establish wireless links to target apparatuses. Prior to initiating new wireless links, source apparatuses may evaluate whether the establishment of new wireless links will increase the cumulative performance of the wireless communication environment, wherein the wireless communication environment may comprise the apparatuses communicating wirelessly within transmission range of a source apparatus. The evaluation may determine, for example, whether predicted cumulative performance of the wireless communication environment after the new wireless link is initiated would be greater than cumulative performance prior to link initiation. | 10-13-2011 |
20120026040 | Method, Apparatus, Computer Program and a Computer Readable Storage Medium - A method including calculating a parameter for controlling a main lobe of a radiation pattern of an antenna array, the calculation using a direction of a location relative to the antenna array, the direction determined from information including a position of the location; determining a parameter for controlling the main lobe of the radiation pattern of the antenna array from a signal received at the antenna array from the location; and determining an offset using the parameter calculated from the determined direction and the parameter determined from the received signal. | 02-02-2012 |
20120163284 | Method, Apparatus, System and Related Computer Program Product for Relay-Sensitive Routing - It is disclosed a method (and related apparatus) comprising indexing at least two source streams from at least one source entities and/or at least two sink streams to at least two sink entities, and determining that at least one signal from the at least one source entity to the at least two sink entities is to be relayed based on a result of the indexing. | 06-28-2012 |
20120202538 | Forecasting of dynamic environmental parameters to optimize operation of a wireless communication system - An aspect of the exemplary embodiments of this invention is a method that includes receiving information from a plurality of spatially distributed user devices, where the information includes at least observations of a radio environment of each user device. Based on the received information, the method creates a model of time evolution of a spatio-temporal map for a plurality of spatial locations. The method further includes creating a policy based on the model of time evolution of the spatio-temporal map, and transmitting the policy to the plurality of user devices. A further aspect of exemplary embodiments of this invention is a method that includes generating a probabilistic model based at least on observations of a radio environment of a user device; transmitting the probabilistic model to a network access node of a wireless communication network; receiving information from the network access node; and operating the user device at least in part based on the received information. Also described are apparatus and computer program products that operate in accordance with the methods. | 08-09-2012 |
20130016669 | Periodic Access ControlAANM Hottinen; AriAACI EspooAACO FIAAGP Hottinen; Ari Espoo FIAANM Peltonen; Jaakko TapaniAACI EspooAACO FIAAGP Peltonen; Jaakko Tapani Espoo FIAANM Pajarinen; Joni KristianAACI VantaaAACO FIAAGP Pajarinen; Joni Kristian Vantaa FI - Methods, apparatus, and program products are presented that perform the following: accessing a periodic finite state controller embodying a set of policies for at least access to one or more wireless resources used for transmission by the apparatus; and using the accessed periodic finite state controller to transmit information using the one or more wireless resources. Methods, apparatus, and program products are presented that perform the following: determining a period based at least on characteristics of a wireless environment; and using at least the determined period and the characteristics, determining a periodic finite state controller embodying a set of policies for at least access to one or more wireless resources used for transmission in the wireless environment by a selected wireless device. | 01-17-2013 |
20130028346 | COGNITIVE RADIO RESOURCE UTILIZATION - The present document discloses a solution for utilizing guard time intervals of another wireless communication system. First, it is detected in a first wireless communication apparatus of a first wireless communication system a guard time interval following a transmission of a second wireless communication apparatus of a second wireless communication system. Thereafter, the first wireless communication apparatus is configured to schedule a transmission in the first wireless communication system to a transmission time interval starting on or after the beginning of the detected guard time interval and ending within the detected guard time interval of the second wireless communication system. | 01-31-2013 |
20130090141 | AVOIDING INTERFERENCE IN COGNITIVE RADIO COMMUNICATIONS - A method, apparatus, and computer program for cognitive radio communications are provided. A reference signal is received from a transmitter of a primary system, and the received reference signal is received with an arbitrarily selected beamforming setting. Then, a signal quality metric is calculated from the received and beamformed reference signal. If the signal quality metric indicates that a reception power of the received signal is low, transmission of a data signal to a wireless communication device of a secondary system is scheduled. In the scheduled transmission in the secondary system, the same beamforming setting as was used in the reception of the reference signal is employed. | 04-11-2013 |
20130100864 | ENERGY-EFFICIENT UNDERLAY DEVICE-TO-MULTIDEVICE COMMUNICATIONS WITH INTERFERENCE SUPPRESSION - A method for performing device-to-multidevice communication with interference suppression is provided. The method may include selecting at least one receiving user equipment for D2MD transmission, and receiving requested data rates from the selected at least one receiving user equipment. The method may further include acquiring CSI matrices and identifying interference constraints to the C-UEs sharing the same frequency band as the at least one receiving user equipment. The method then includes determining precoding matrices using the acquired CSI matrices and the identified interference constraints to the C-UEs, and performing D2MD transmission to the at least one receiving user equipment using the determined precoding matrices. | 04-25-2013 |
20140321350 | FACILITATING POWER CONSERVATION FOR LOCAL AREA TRANSMISSIONS - An apparatus for triggering generation of a service period(s) in a network may include a processor and memory storing executable computer program code that cause the apparatus to at least perform operations including triggering generation of at least one service period in a first network based in part on receipt of information from a network device of a second network. The computer program code may further cause the apparatus to enable wake up, based in part on the generated service period, of one or more devices of the first network for communication of content to at least one of the devices during a specified time period of the service period. Corresponding methods and computer program products are also provided. | 10-30-2014 |
20140369394 | BEAM-STEERING CONFIGURATIONS AND TESTS - An apparatus, method and system for beam-steering configurations and tests in a communication system. In one embodiment, the apparatus includes a processor | 12-18-2014 |
20150009844 | Cooperation Mechanism to Lower Stand-By Power Consumption - Methods and apparatus, including computer program products, are provided for enabling lower power consumption. In one aspect there is provided a method. The method may include establishing, by an apparatus, a first wide area network access link to a wide area network including a base station; establishing, by the apparatus, a wireless local link to at least one other apparatus; and placing the first wide area network access link on hold to allow data transmission to the wide area network to occur through the wire-less local link to the at least one other apparatus and a second wide area network access link coupling the at least one other apparatus to the wide area network. Related apparatus, systems, methods, and articles are also described. | 01-08-2015 |
20150063206 | METHOD AND APPARATUS FOR LOCAL AREA NETWORK IMPLEMENTATION - Various methods are described for implementing secondary networks for cooperative communications with a primary network. One example method may include providing for connection to a primary network. The method of this example embodiment may further include receiving configuration information comprising one or more criteria for connecting to a secondary network. Furthermore, the method of this example embodiment may include providing for connection to the secondary network based at least in part on the one or more criteria. The method of this example embodiment may further include causing communication of data with a network entity in the primary network in cooperation with one or more devices connected to the secondary network. Similar and related example methods, example apparatuses, and example computer program products are also provided. | 03-05-2015 |