Patent application number | Description | Published |
20100087204 | SYSTEM AND METHOD OF UMTS UE LOCATION USING UPLINK DEDICATED PHYSICAL CONTROL CHANNEL AND DOWNLINK SYNCHRONIZATION CHANNEL - A system and method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“LMUs”). A set of signal samples from a first wireless device and a second wireless device may be collected by one or more LMUs in a search window. A first time of arrival (“TOA”) is determined, and a second search window is estimated as a function of the first TOA. A second TOA may be determined within the second search window at a second node or one of the LMUs from the set of signal samples. A range estimate of the wireless device may then be determined, and an estimated location of the wireless device may be determined as a function of the first uplink TOA, the second uplink TOA, or the range estimate and second TOA. | 04-08-2010 |
20100316092 | SYSTEM AND METHOD FOR DETECTING SPREAD SPECTRUM SIGNALS IN A WIRELESS ENVIRONMENT - An apparatus for detecting a spread spectrum signal in a wireless signal environment includes at least one antenna for receiving spread spectrum signals, such as UMTS signals, from a signal source in the wireless signal environment. In one embodiment, a detection circuit is configured for correlating a code in signal received by the apparatus with a set of possible codes for spread spectrum signals in order to detect the existence of a spread spectrum signal. In another embodiment, a detection circuit is configured for obtaining at least one reference frame of data from a received signal. The detection circuit is further operable for correlating a segment of the reference frame with a repeated segment of at least one subsequent frame of data in order to detect the existence of a spread spectrum signal. A repeater might incorporate such an apparatus wherein the variable gain of the repeater is adjusted based upon the correlation and the detection of a spread spectrum signal. | 12-16-2010 |
20100329311 | UPLINK SIGNAL DETECTION IN RF REPEATERS - A method for detecting an IS-95 signal without knowledge of a spreading code for the IS-95 signal is provided. A received baseband signal is rotated through a plurality of phase-shifts. For each phase-shifted baseband signal, an in-phase component or a quadrature component of the phase-shifted baseband signal is realigned. The in-phase and quadrature components are multiplied by a PN short code to partially despread the components. The partially despread in-phase and quadrature components are multiplied and integrated. The integrated despread in-phase and quadrature components are compared to a threshold value. In response to exceeding the threshold value, the received baseband signal is identified as an IS-95 signal. The method may be implemented on a repeater for repeating signals between multiple sources. | 12-30-2010 |
20120028653 | SYSTEM AND METHOD OF UMTS UE LOCATION USING UPLINK DEDICATED PHYSICAL CONTROL CHANNEL AND DOWNLINK SYNCHRONIZATION CHANNEL - A system and method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“LMUs”). A set of signal samples from a first wireless device and a second wireless device may be collected by one or more LMUs in a search window. A first time of arrival (“TOA”) is determined, and a second search window is estimated as a function of the first TOA. A second TOA may be determined within the second search window at a second node or one of the LMUs from the set of signal samples. A range estimate of the wireless device may then be determined, and an estimated location of the wireless device may be determined as a function of the first uplink TOA, the second uplink TOA, or the range estimate and second TOA. | 02-02-2012 |
20120129550 | SYSTEM AND METHOD FOR HYBRID LOCATION IN AN LTE NETWORK - A system and method for estimating a location of a wireless device receiving signals from plural nodes of a communications network. A wireless device may be directed to transmit a first signal having one or more predetermined parameters. At one or more location measurement units (“LMU”) an uplink time of arrival (“TOA”) measurement between the wireless device and one or more of the plural nodes or LMUs may be determined as a function of the first signal transmitted from the wireless device. Downlink signal measurements of signals received by the wireless device may be collected, and a location of the wireless device determined as a function of the uplink TOA measurements and the collected downlink signal measurements. | 05-24-2012 |
20130095853 | System and Method of UMTS UE Location Using Uplink Dedicated Physical Control Channel And Downlink Synchronization Channel - A system and method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“LMUs”). A set of signal samples from a first wireless device and a second wireless device may be collected by one or more LMUs in a search window. A first time of arrival (“TOA”) is determined, and a second search window is estimated as a function of the first TOA. A second TOA may be determined within the second search window at a second node or one of the LMUs from the set of signal samples. A range estimate of the wireless device may then be determined, and an estimated location of the wireless device may be determined as a function of the first uplink TOA, the second uplink TOA, or the range estimate and second TOA. | 04-18-2013 |
20130143598 | UMTS PROXIMITY DETECTION WITH UPLINK AND DOWNLINK SIGNALS - A method and system for determining the location of a mobile device in a communications network or the proximity of the device to a node in the network. A location request may be received for a mobile device served by a base station in the network. A set of nodes associated with the serving base station may then be tasked and downlink data collected at a first node, the downlink data from a downlink signal received from the serving base station. Downlink frame timing may then be determined as a function of the collected downlink data and uplink data collected at a second node as a function of the determined downlink frame timing. A geographic location for the device or proximity thereof to a node may be determined as a function of the collected uplink data. | 06-06-2013 |
20130181865 | Autonomous Transmit Chain Delay Measurements - A system and method for determining transmission delay in a communications system. In some embodiments, satellite positioning information may be received for a mobile device and enhanced cell identification (E-CID) positioning information received for the mobile device. A location of the mobile device may be determined as a function of the received satellite positioning information, and transmission delay between a node serving the mobile device and an antenna serving the mobile device determined as a function of the received E-CID positioning information and the determined location of the mobile device. | 07-18-2013 |
20130203447 | LTE USER EQUIPMENT POSITIONING SYSTEM AND METHOD - A method of determining the location of a mobile device in a communications network having a plurality of nodes, one of the plural nodes serving the device. Observed positioning measurements for a mobile device may be received from the serving node and uplink enhanced cell identification (E-CID) positioning measurements received from the mobile device. One or more ranges between ones of the plural nodes and the mobile device may then be determined as a function of the received observed positioning measurements and the received uplink E-CID positioning measurements. A geographic location of the mobile device may then be estimated as a function the determined one or more ranges. | 08-08-2013 |
20140171105 | Enhanced Cell ID Location Method Using Non Uniform Subsectors and Neighboring Cell Centroid - A system and method of determining the location of a mobile device. Network measurement report information may be received from a target mobile device, the NMR having measurement information and range information of the target mobile device from a cell serving the device. The serving cell may be divided a plurality of subsectors and candidate locations placed on an intersection of a range formed from the range information and bisectors of the plurality of subsectors. A subset of neighboring and serving cells may be selected as a function of the NMR measurement information and a radio frequency (RF) coverage centroid determined for each of the selected neighboring cells. A centroid of the determined RF centroids may be determined, and a location of the target mobile device estimated as the candidate location having a minimum distance to the determined centroid. | 06-19-2014 |