Abstract:
PROBLEM TO BE SOLVED: To provide a method and device for providing emergency notification by a wireless mobile device in response to a trigger of a sensor that is remote from the wireless mobile device. SOLUTION: A detection system located within a vehicle is configured to sense an emergency event with one or more sensors and transmit a message regarding the emergency event via a wireless link. A wireless mobile device within a short range of a transmitter receives the message via a short range receiver located therein and processes the message regarding the trigger of the sensor. For example, the wireless mobile device determines position information about the wireless transmitter and/or mobile device, calls a predetermined emergency number such as E911, and transmits data including position and other pieces of information from the wireless mobile device in response to the received message to the emergency number. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a methods and an apparatus for controlling distribution of location information. SOLUTION: A mobile system communicates its location information to a server system and sends permission criteria defining which other mobile systems are allowed to access its location. In the case where the mobile system does not provide its location, the server determines the location using the other position information. The server system receives a request from another mobile system for the location and sends the location to other mobile systems in accordance with the permission criteria. If no permission criterion has been sent, the server system queries the mobile system for the permission criteria. If no permission criterion is sent by the mobile system, or if the permission criterion denies the request, the server system can, alternately, not reply to the request or reply with an error message. The permission criteria can include additional access limitations such as dates or times during which access is permitted or denied, and geographic areas in which access is permitted or denied. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide various methods and devices which synchronize portable base stations in a portable network.SOLUTION: A first date and a first geographical location of a first mobile portable receiving station (MS) are determined based on a first satellite positioning system (SPS) receiver arranged together with the first MS. Then, the first date and the first location are transmitted by the first MS to a first base station. In the first base station, the date of the first base station is determined based on the first date, the first location, and a known location of the first base station.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for synchronizing cellular base stations in a cellular network.SOLUTION: In this method, a first date-and-time and a first geographical location of a first mobile cellular receiver station (MS) are determined from a first satellite positioning system (SPS) receiver which is co-located with the first MS, and the first date-and-time and the first location are transmitted by the first MS to a first base station which determines a date-and-time of the first base station from the first date-and-time and the first location and from a known location of the first base station.
Abstract:
A method for time synchronizing base stations in an asynchronous cellular communication system via multi-communications mode user equipment is described. The method includes receiving time-of-day in a synchronous cellular communication signal with the user equipment operable in a synchronous cellular communications mode. Alternatively, time-of-day is received from a non-cellular system signal with user equipment that is operable to receive signals from the non-cellular system. After time-of-day is received the user equipment is switched to operate in an asynchronous cellular communications mode. Then a frame boundary of a received asynchronous cellular communication signal is time-tagged. Timing information is then transmitted to an entity of the asynchronous cellular communication system to determine time-of-day at the entity.
Abstract:
Methods and apparatuses for processing Satellite Positioning System (SPS) signals. In one exemplary method, a first set of frequency coefficient, which corresponds to a first Doppler frequency of an SPS signal, is determined, and said SPS signal is processed in a matched filter with the first set of frequency coefficients during a first window of time. A second set of frequency coefficients, which corresponds to a second Doppler frequency of the SPS signal, is determined, and the SPS signal is processed in the matched filter with the second set of frequency coefficients during a second window of time, where the first and second windows of time occur within a period of time which is not greater than one SPS frame period. In another exemplary method, a first SPS signal is processed in a matched filter with a first set of pseudonoise (PN) coefficients during a first window of time, where the first set of PN coefficients corresponds to the first SPS signal, and a second SPS signal is processed in the matched filter with a second set of PN coefficients (which correspond with the second SPS signal) during a second window of time, wherein the first window and the second windows occur within a period of time not greater than one SPS frame period.
Abstract:
A system (100) for and method of estimating a frequency shift parameter of an oscillator (110) are described. A received signal is down-converted (102). The first and second correlation functions represent the likelihood of one or more frequency hypotheses at first and second times, respectively. An estimate of a frequency shift parameter is derived from the first and second correlation functions.
Abstract:
A method and apparatus are disclosed for fixing the location of a receiver using transmitted signals that include a unique periodically repeating sequence. The apparatus and method are useful in communication systems, especially unsynchronized systems, such as A-GPS utilized on GSM and UMTS cellular telephone systems. A received signal is stored by the receiver for at least two repetitions of the periodically repeating sequence. FFT operations are performed, and the resulting data frequency samples are pruned responsive to a hypothesized residual frequency. This reduces the number of subsequent calculations required and the processing time. A correlation series is determined from the pruned samples and reference frequency samples corresponding to a hypothesized transmitter. If a match is found, a code phase offset is determined; if not, the process is repeated with another hypothesized residual frequency. Multiple correlation series similarly obtained may also be incoherently combined prior to this examination.
Abstract:
In general, the invention is directed to techniques for directly acquiring P-codes without first acquiring C/A-codes. For example, in one embodiment, a system comprises an assist server to track a P-code signal from a Global Positioning System GPS satellite and generate acquisition assistance information from the signal. The system further comprises a mobile unit to receive the acquisition assistance data from the assist server, and to acquire the P-code signal from the satellite based on the acquisition assistance data. The acquisition assistance data may include time-of-week data indicating an initial time offset into a P-code pseudorandom code sequence for the satellite. The mobile unit may include a reference generator to locally generate a reference pseudorandom code sequence based on the time-of-week data.