Patents by Inventor Xavier Perez Costa
Xavier Perez Costa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9439104Abstract: A method for supporting admission control and/or path selection in a communication network, the network including a plurality of wireless communication links, possibly of different link technologies, established between a plurality of network nodes, includes the steps of partitioning the communication links of the network into groups of communication links—link groups—, assigning each link group an associated link group controller that is configured to observe and/or measure the performance and/or quality of the link group, based on the observations and/or measurements, computing estimates of metrics for the capacity of the respective link group and the costs for using each of the communication links of the respective link group, and transmitting the estimates to at least one resource management entity being configured to take admission control and/or path selection decisions on the basis of the estimates.Type: GrantFiled: July 15, 2010Date of Patent: September 6, 2016Assignees: NEC CORPORATION, UNIVERSIDAD CARLOS III DE MADRIDInventors: Frank Zdarsky, Xavier Pèrez Costa, Roberto De Marca, Albert Banchs, Antonio De La Oliva
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Patent number: 9338686Abstract: Method for operating a wireless network, wherein at least one MIMO (Multiple Input Multiple Output) group of different stations will be constructed by a grouping algorithm based on a grouping metric for providing a MIMO group of different stations addressable simultaneously in space by a base station using MIMO techniques and meeting a definable level of performance quality, the grouping metric being based on an SINR (Signal-to-Interference and Noise Ratio) experienced by each station within the MIMO group. The method includes: computing an SNR (Signal-to-Noise Ratio) that a new station would experience without any interference when added to an existing MIMO group; computing an SINR estimate by correcting the SNR with the sum of spatial correlations between the new and each of the stations already present in the existing MIMO group; and using the SINR estimate for deciding whether the new station can be added to the existing MIMO group.Type: GrantFiled: January 13, 2012Date of Patent: May 10, 2016Assignee: NEC EUROPE LTD.Inventors: Anatolij Zubow, Johannes Marotzke, Daniel Camps Mur, Xavier Perez Costa
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Patent number: 9306711Abstract: A method of assembling a frame in an Orthogonal Frequency Division Multiple Access (OFDMA)-based communication system, wherein data packets to be transmitted from a broadcast station to a receiver are given a rectangular shape in terms of the two dimensions—time and frequency—of the OFDMA frame, and wherein the data packets are successively fitted into the OFDMA frame by way of a frame assembly scheduler, is characterized in that the filling process of the OFDMA frame is based on an ordered list of data structures that represent the current empty space within the OFDMA frame. Furthermore, a corresponding communication system is disclosed.Type: GrantFiled: November 28, 2007Date of Patent: April 5, 2016Assignee: NEC EUROPE LTD.Inventors: Anatolij Zubow, Xavier Perez Costa, Daniel Camps Mur, Julio Arauz, Paolo Favaro
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Patent number: 9204384Abstract: A method for operating a mobile terminal as access point, wherein the access point composes a network together with one or more associated client stations, wherein the access point has an operational mode of alternating awake and sleep periods, and wherein the access point broadcasts beacon frames at regular intervals for signaling communication parameters to the associated client stations, is characterized in that the access point, based on the level of activity in the network, adjusts the communication parameters by slowing down or accelerating the access of the associated client stations to the network. Furthermore, a corresponding mobile terminal is disclosed.Type: GrantFiled: August 6, 2010Date of Patent: December 1, 2015Assignee: NEC EUROPE LTD.Inventors: Daniel Camps Mur, Xavier Perez Costa
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Patent number: 9106590Abstract: A method for controlling the admission of a flow to a network, particularly a WiMAX (Worldwide Interoperability for Microwave Access) network, wherein an estimation of maximum capacity required within a link of the network and/or within the network will be performed for examining, whether the flow requesting to enter the network with at least one QoS (Quality of Service) reservation of resources can be admitted, by finding first sets of intersections between all pairs of QoS reservations, i.e. the QoS reservations already accepted within the link and/or within the network and the at least one QoS reservation requested by the flow. The method is characterized by structuring the found sets of intersections by building a matrix of intersections of QoS reservations and—based on the matrix—deriving the rest of the sets of intersections between the intersections found, based on information obtained regarding the QoS reservations involved in each intersection.Type: GrantFiled: September 14, 2010Date of Patent: August 11, 2015Assignee: NEC EUROPE LTD.Inventors: Xavier Perez Costa, Marco Mezzavilla, Roberto De Marca
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Patent number: 9100977Abstract: A method for operating a wireless terminal as an access point—access point terminal (2)—that connects a set of one or more client terminals (4) to an external network, wherein a schedule of absence periods is established during which the connected client terminals (4) are not allowed to transmit data to the access point terminal (2), wherein the absence periods together with corresponding presence periods are scheduled at regular intervals and have certain durations, is characterized in that an adaptation of the absence/presence periods' duration and/or interval parameters is executed on the basis of the bandwidth available in the external network and the amount of traffic transmitted between the access point terminal (2) and the connected client terminals (4). Furthermore, a corresponding wireless terminal is disclosed.Type: GrantFiled: June 28, 2010Date of Patent: August 4, 2015Assignee: NEC EUROPE LTD.Inventors: Daniel Camps Mur, Xavier Perez Costa
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Patent number: 9094959Abstract: A communication network, wherein the network includes a plurality of communication elements that function as transmitters and/or receivers, in particular base stations and operating nodes being associated to at least one of the base stations, wherein the communication between the transmitters and the receivers is performed by way of generating and transmitting signals based on a multi-carrier modulation with a number of N subcarriers around a carrier frequency fc, is characterized in that the communication elements are configured to perform, upon receiving a transmitted signal, a sub-sampling of the received signal, wherein only a predetermined number of the inner-most subcarriers around the carrier frequency fc are employed for data reconstruction. Furthermore, a respective method for operating a communication network is described.Type: GrantFiled: August 24, 2010Date of Patent: July 28, 2015Assignee: NEC EUROPE LTD.Inventors: Peter Rost, Andreas Maeder, Xavier Perez Costa
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Patent number: 8873393Abstract: In order to allow an efficient use of data or frame aggregation techniques with real-time communications a method for operating a wireless network, especially a Wi-Fi technology based network, is described, wherein the network includes at least one wireless device for transmission of data and wherein the device may use a data or frame aggregation technique to provide an adjustable amount of aggregation. The method is characterized in that the amount of aggregation provided by the aggregation technique will be adjusted depending on a level of congestion in the network. Further, an according wireless network is described, preferably for carrying out the above mentioned method.Type: GrantFiled: January 20, 2010Date of Patent: October 28, 2014Assignee: NEC Europe Ltd.Inventors: Daniel Camps Mur, Manil Gomony, Xavier Perez Costa
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Patent number: 8819688Abstract: A method of scheduling periodic processes for execution in an electronic system, in particular in a network, in a data processor or in a communication device, wherein the electronic system includes a controller for performing the scheduling, wherein a number of N processes Pi are already scheduled with each process Pi having an individual service interval Sli, and wherein an additional process PN+1 is to be scheduled with a service interval SIN+1, is characterized in that the additional process PN+1 is scheduled in such a way that the minimum time lag between the execution times of the additional process PN+1 and the execution times of the number of N already scheduled processes Pi is maximized. Furthermore, a corresponding device for scheduling periodic processes for execution in an electronic system is disclosed.Type: GrantFiled: August 27, 2009Date of Patent: August 26, 2014Assignee: NEC Europe Ltd.Inventors: Daniel Camps Mur, Xavier Perez Costa
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Publication number: 20140010080Abstract: Method for operating a wireless network, wherein at least one MIMO (Multiple Input Multiple Output) group of different stations will be constructed by a grouping algorithm based on a grouping metric for providing a MIMO group of different stations addressable simultaneously in space by a base station using MIMO techniques and meeting a definable level of performance quality, the grouping metric being based on an SINR (Signal-to-Interference and Noise Ratio) experienced by each station within the MIMO group. The method includes: computing an SNR (Signal-to-Noise Ratio) that a new station would experience without any interference when added to an existing MIMO group; computing an SINR estimate by correcting the SNR with the sum of spatial correlations between the new and each of the stations already present in the existing MIMO group; and using the SINR estimate for deciding whether the new station can be added to the existing MIMO group.Type: ApplicationFiled: January 13, 2012Publication date: January 9, 2014Applicant: NEC EUROPE LTD.Inventors: Anatolij Zubow, Johannes Marotzke, Daniel Camps Mur, Xavier Perez Costa
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Patent number: 8509165Abstract: A method for filling a WiMAX downlink frame by the base station of a WiMAX network, wherein the downlink MAC Protocol Data Units (MPDUs) are fitted into the WiMAX downlink frame by means of a DL-MAP scheduler, which allows the concatenation of downlink MPDUs from different connections in single bursts, the bursts having a rectangular shape in terms of the two dimensions—OFDMA (Orthogonal Frequency Division Multiple Access) symbols and subchannels—of a WiMAX downlink frame, is characterized in that the DL-MAP scheduler is configured in a way that it considers the concatenation of downlink MPDUs from different connections in single bursts based on the available and/or the remaining free space in the WiMAX downlink frame, such that it simplifies the DL-MAP scheduler task of filling the WiMAX downlink frame minimizing the amount of wasted radio resources.Type: GrantFiled: August 15, 2007Date of Patent: August 13, 2013Assignee: NEC Europe Ltd.Inventors: Xavier Perez Costa, Daniel Camps Mur, Julio Arauz
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Publication number: 20130136113Abstract: A communication network, wherein the network includes a plurality of communication elements that function as transmitters and/or receivers, in particular base stations and operating nodes being associated to at least one of the base stations, wherein the communication between the transmitters and the receivers is performed by way of generating and transmitting signals based on a multi-carrier modulation with a number of N subcarriers around a carrier frequency fc, is characterized in that the communication elements are configured to perform, upon receiving a transmitted signal, a sub-sampling of the received signal, wherein only a predetermined number of the inner-most subcarriers around the carrier frequency fc are employed for data reconstruction. Furthermore, a respective method for operating a communication network is described.Type: ApplicationFiled: August 24, 2010Publication date: May 30, 2013Applicant: NEC EUROPE LTD.Inventors: Peter Rost, Andreas Maeder, Xavier Perez Costa
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Publication number: 20130121228Abstract: A method for managing energy consumption in a wireless network, in particular a mobile radio network, wherein the wireless network includes radio access points that provide uplink and downlink connections to the wireless network for mobile stations, and wherein the uplink and the downlink connection of at least one mobile station being connected to the wireless network are physically served by different radio access points is characterized in that, at least temporarily, one or more of the radio access points function as unidirectional radio access points that provide either uplink connections or downlink connections—radio resource access—for the at least one mobile station. Furthermore, a corresponding wireless network system is disclosed.Type: ApplicationFiled: July 29, 2011Publication date: May 16, 2013Applicant: NEC EUROPE LTD.Inventors: Peter Rost, Andreas Maeder, Xavier Perez Costa
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Publication number: 20120294150Abstract: In order to allow an efficient use of data or frame aggregation techniques with real-time communications a method for operating a wireless network, especially a Wi-Fi technology based network, is described, wherein the network includes at least one wireless device for transmission of data and wherein the device may use a data or frame aggregation technique to provide an adjustable amount of aggregation. The method is characterized in that the amount of aggregation provided by the aggregation technique will be adjusted depending on a level of congestion in the network. Further, an according wireless network is described, preferably for carrying out the above mentioned method.Type: ApplicationFiled: January 20, 2010Publication date: November 22, 2012Applicant: NEC EUROPE LTD.Inventors: Daniel Camps Mur, Manil Gomony, Xavier Perez Costa
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Publication number: 20120201131Abstract: A method for controlling the admission of a flow to a network, particularly a WiMAX (Worldwide Interoperability for Microwave Access) network, wherein an estimation of maximum capacity required within a link of the network and/or within the network will be performed for examining, whether the flow requesting to enter the network with at least one QoS (Quality of Service) reservation of resources can be admitted, by finding first sets of intersections between all pairs of QoS reservations, i.e. the QoS reservations already accepted within the link and/or within the network and the at least one QoS reservation requested by the flow. The method is characterized by structuring the found sets of intersections by building a matrix of intersections of QoS reservations and—based on the matrix—deriving the rest of the sets of intersections between the intersections found, based on information obtained regarding the QoS reservations involved in each intersection.Type: ApplicationFiled: September 14, 2010Publication date: August 9, 2012Applicant: NEC EUROPE LTD.Inventors: Xavier Perez Costa, Marco Mezzavilla, Roberto De Marca
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Publication number: 20120195193Abstract: A method for operating a mobile terminal as access point, wherein the access point composes a network together with one or more associated client stations, wherein the access point has an operational mode of alternating awake and sleep periods, and wherein the access point broadcasts beacon frames at regular intervals for signaling communication parameters to the associated client stations, is characterized in that the access point, based on the level of activity in the network, adjusts the communication parameters by slowing down or accelerating the access of the associated client stations to the network. Furthermore, a corresponding mobile terminal is disclosed.Type: ApplicationFiled: August 6, 2010Publication date: August 2, 2012Applicant: NEC EUROPE LTD.Inventors: Daniel Camps Mur, Xavier Perez Costa
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Publication number: 20120178429Abstract: A method for operating a wireless terminal as an access point—access point terminal (2)—that connects a set of one or more client terminals (4) to an external network, wherein a schedule of absence periods is established during which the connected client terminals (4) are not allowed to transmit data to the access point terminal (2), wherein the absence periods together with corresponding presence periods are scheduled at regular intervals and have certain durations, is characterized in that an adaptation of the absence/presence periods' duration and/or interval parameters is executed on the basis of the bandwidth available in the external network and the amount of traffic transmitted between the access point terminal (2) and the connected client terminals (4). Furthermore, a corresponding wireless terminal is disclosed.Type: ApplicationFiled: June 28, 2010Publication date: July 12, 2012Applicant: NEC EUROPE LTD.Inventors: Daniel Camps Mur, Xavier Perez Costa
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Publication number: 20120170457Abstract: A method for supporting admission control and/or path selection in a communication network, the network including a plurality of wireless communication links, possibly of different link technologies, established between a plurality of network nodes, includes the steps of partitioning the communication links of the network into groups of communication links—link groups—, assigning each link group an associated link group controller that is configured to observe and/or measure the performance and/or quality of the link group, based on the observations and/or measurements, computing estimates of metrics for the capacity of the respective link group and the costs for using each of the communication links of the respective link group, and transmitting the estimates to at least one resource management entity being configured to take admission control and/or path selection decisions on the basis of the estimates.Type: ApplicationFiled: July 15, 2010Publication date: July 5, 2012Applicants: UNIVERSIDAD CARLOS III DE MADRID, NEC EUROPE LTD.Inventors: Frank Zdarsky, Xavier Perez Costa, Roberto De Marca, Albert Banchs, Antonio De La Oliva
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Publication number: 20110058525Abstract: A method for filling a WiMAX downlink frame by the base station of a WiMAX network, wherein the downlink MAC Protocol Data Units (MPDUs) are fitted into the WiMAX downlink frame by means of a DL-MAP scheduler, which allows the concatenation of downlink MPDUs from different connections in single bursts, the bursts having a rectangular shape in terms of the two dimensions—OFDMA (Orthogonal Frequency Division Multiple Access) symbols and subchannels—of a WiMAX downlink frame, is characterized in that the DL-MAP scheduler is configured in a way that it considers the concatenation of downlink MPDUs from different connections in single bursts based on the available and/or the remaining free space in the WiMAX downlink frame, such that it simplifies the DL-MAP scheduler task of filling the WiMAX downlink frame minimizing the amount of wasted radio resources.Type: ApplicationFiled: August 15, 2007Publication date: March 10, 2011Applicant: NEC EUROPE LTD.Inventors: Xavier Perez Costa, Daniel Camps Mur, Julio Arauz
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Publication number: 20110026546Abstract: A method of assembling a frame in an Orthogonal Frequency Division Multiple Access (OFDMA)-based communication system, wherein data packets to be transmitted from a broadcast station to a receiver are given a rectangular shape in terms of the two dimensions—time and frequency—of the OFDMA frame, and wherein the data packets are successively fitted into the OFDMA frame by way of a frame assembly scheduler, is characterized in that the filling process of the OFDMA frame is based on an ordered list of data structures that represent the current empty space within the OFDMA frame. Furthermore, a corresponding communication system is disclosed.Type: ApplicationFiled: November 28, 2007Publication date: February 3, 2011Applicant: NEC EUROPE LTD.Inventors: Anatolij Zubow, Xavier Perez Costa, Daniel Camps Mur, Julio Arauz, Paolo Favaro