Abstract: A system, method, apparatus, signal-bearing medium, and means for transmitting speech activity in a distributed voice recognition (VR) system. The distributed voice recognition system includes a local VR engine in a subscriber unit (102) and a server VR engine on a server (160). The local VR engine comprises a voice activity detection (VAD) module (106) that detects voice activity within a speech signal, and comprises an advanced feature extraction (AFE) module (104) that extracts features from a speech signal. The detected voice activity information is transmitted over a first wireless communication channel to the server (160). The feature extraction information is transmitted over a second wireless communication channel, separate from the first wireless communication channel, to the server (160). The server (160) processes the received information to determine a linguistic estimate of the electrical speech signal, and transmits the linguistic estimate to the subscriber unit (102).

Abstract: A mutual authentication method is provided for securely agreeing application-security keys with mobile terminals supporting legacy Subscriber Identity Modules (e.g., GSM SIM and CDMA2000 R-UIM, which do not support 3G AKA mechanisms). A challenge-response key exchange is implemented between a bootstrapping server function (BSF) and mobile terminal (MT). The BSF generates an authentication challenge and sends it to the MT under a server-authenticated public key mechanism. The MT receives the challenge and determines whether it originates from the BSF based on a bootstrapping server certificate. The MT formulates a response to the authentication challenge based on keys derived from the authentication challenge and a pre-shared secret key. The BSF receives the authentication response and verifies whether it originates from the MT.

Abstract: A system is disclosed that senses physical characteristics of an electronic device. The system controls the electronic device in response to the sensed physical characteristics. The system includes a control subsystem. The control subsystem includes a time trigger and an anticipation/latency reduction subsystem. The anticipation/latency reduction subsystem includes additional subsystems such as a time trigger, a position trigger and an attitude trigger. In an alternate embodiment, the anticipation/latency reduction subsystem also includes an activation interval trigger, a repetitive action trigger and a repetitive distance trigger. The various triggers can be implemented using processors that execute software. The system also includes sensing devices, such as a position sensing device and an attitude sensing device, to sense physical characteristics of the particular electronic device being controlled. The control subsystem receives signals from the sensing devices.

Abstract: A programmable varactor apparatus may include multiple binary weighted varactors controlled by multiple digital varactor bits. A programmable varactor apparatus may include a plurality of binary weighted varactors, and a control to selectively disable one or more of the plurality of binary weighted varactors to decrease an effective capacitance of the programmable varactor apparatus. A method for changing an effective capacitance of a programmable varactor apparatus may include providing a plurality of binary weighted varactors, and disabling one or more of the plurality of binary weighted varactors to decrease the effective capacitance of the programmable varactor apparatus.

Abstract: A method of signal reception according to one embodiment of the invention includes compensating for an estimated or measured Doppler shift during integration of a correlated signal. Such a method also includes determining a composite peak position and correcting this position based on the compensation.

Abstract: A method for protecting traffic in a radio access network connected to at least two core networks. The method comprises maintaining a core-network-specific authentication protocol and a radio-bearer-specific ciphering process, and generating, for each ciphering process, a count parameter comprising a cyclical sequence number and a hyperframe number (HFN) which is incremented each time the cyclical sequence number completes one cycle. For each core network or authentication protocol, a first radio bearer of a session is initialized with a HFN exceeding the highest HFN used during the previous session. When a new radio bearer is established, the mobile station selects the highest HFN used during the session for the core network in question, increments it and uses it for initializing the count parameter for the new radio bearer. At the end of a session, the mobile station stores at least part of the highest HFN used during the session.

Abstract: A mixed serial-parallel content addressable memory (CAM) includes serial CAM cells and parallel CAM cells that are arranged in multiple (N) columns and multiple (M) rows. Each row includes at least one serial CAM cell and at least two parallel CAM cells. The M rows are searched in parallel. For each row, the serial CAM cells are searched sequentially, and the parallel CAM cells are selectively searched in parallel. The CAM further includes a driver that generates search lines for the N columns of CAM cells, one search line per column. The driver sets the search lines to an N-bit value to search for in the CAM. Prior to each search operation, the driver presets at least one search line for at least one column of serial CAM cells to precharge a match line for each row.

Abstract: An improved method and system for determining round-trip time (RTT) during a radio link protocol (RLP) wireless communication link. The RTT estimate is negotiated by both sides of the RLP communication link without the need for the 3-way handshake generally required for RLP synchronization. The method includes techniques used by both sides of the RLP communication link to dynamically update and refine their initial, negotiated RTT estimates.

Abstract: A system for maintaining time in a satellite positioning system (SPS) receiver that relies on almanac data to maintain a reasonably accurate time. The approximate time based on almanac data is sufficiently accurate to bound the unknown parameters when a request for position is received. The receiver may automatically update the internal time and/or position. When a time update is required, the approximate time based on almanac data is sufficiently accurate that the receiver need only acquire the code phase from the satellites and can internally determine the code period into the bit and the bit into the week based on the almanac data.

Abstract: The present invention provides a method and apparatus for maximizing throughput of a data call in a wireless communication system in which data is transmitted from a wireless station, such as a mobile station, on multiple assigned channels in accordance with a known transmission standard, such as IS-95B. The multiple assigned channels include a fundamental channel and at least one supplemental channel. Data is formatted into variable rate data frames and transmitted on the fundamental channel and the supplemental channel. A wireless receiver, such as a base station, receives the multiple assigned channels. The wireless receiver demodulates and decodes data frames associated with each of the multiple assigned channels. The wireless receiver determines a likely initial data rate for each demodulated and decode data frame.

Abstract: Corrections to a coarse position estimate of the pseudorange receiving device are made based upon knowledge of the amount of error present in inaccurate information (e.g., the old Almanac and/or Ephemeris) used to estimate the coarse position.

Abstract: A method and system for speech recognition combines different types of engines in order to recognize user-defined digits and control words, predefined digits and control words, and nametags. Speaker-independent engines are combined with speaker-dependent engines. A Hidden Markov Model (HMM) engine is combined with Dynamic Time Warping (DTW) engines.

Abstract: Techniques for maintaining packet data connectivity in a wireless communications network are presented. A mobile station detects a change from a first packet control function (PCF) to a second PCF. The first PCF is connected to a first packet data service node (PDSN). The second PCF is connected to a second PDSN. The mobile station consults a database configured to map at least one previously visited PCF to a servicing PDSN. Based at least in part on the consulting, the mobile station observes one from among a plurality of predetermined origination patterns, wherein an origination pattern defines origination functions to be performed by the mobile station. As such, zombie PPP and mobile IP instances may be detected and handled.

Abstract: Compensation for variations in temperature and manufacturing process of a MOSFET operating in its sub-threshold mode. The compensation may include circuitry containing at least a second MOSFET that may also operate in its sub-threshold mode. The operational characteristics of the second MOSFET may be closely matched to those of the first MOSFET, and the second MOSFET may be contained on the same substrate.

Abstract: A system for digital filtering includes a set of logic gates, a state storage, and a multiplexer. The state storage includes two or more storage banks and may also include combinatorial logic and/or at least one lookup table. In one application, a filtering operation according to a finite-impulse-response filter coefficient vector is performed without runtime multiplications. Applications to symmetric and antisymmetric filter coefficient vectors are described, as well as applications to filter coefficient vectors of arbitrary odd or even length.

Abstract: A low-bit-rate coding technique for unvoiced segments of speech includes the steps of extracting high-time-resolution energy coefficients from a frame of speech, quantizing the energy coefficients, generating a high-time-resolution energy envelope from the quantized energy coefficients, and reconstituting a residue signal by shaping a randomly generated noise vector with quantized values of the energy envelope. The energy envelope may be generated with a linear interpolation technique. A post-processing measure may be obtained and compared with a predefined threshold to determine whether the coding algorithm is performing adequately.

Abstract: An apparatus and method for filtering a signal in a phase lock loop is disclosed. An typical apparatus for filtering a phase error signal comprises a first filter subcircuit receiving a phase error signal from a phase comparator and filtering the error signal when enabled, a second filter subcircuit receiving the phase error signal from the phase comparator and filtering the error signal when enabled and first and second enable switches which are activated in combination to control filtering of at the error signal. The first filter subcircuit is enabled by activating a first combination of the enable switches and the second filter subcircuit is enabled by activating a second combination of the enable switches. A fast acquisition subcircuit can also be used to temporarily underdampen the filter and improve overall performance of the phase lock loop circuit. The filter can be used to obtain multimode operation in a cellular radio.

Abstract: A method for adjusting a power level in a communications network which includes a first plurality of signal-transmission-elements adapted to receive signals coupled to a second plurality of signal-transmission-elements adapted to transmit the signals, the method including de-activating at least some of the first plurality so that the signals are not received in the first plurality and de-activating at least some of the second plurality so that the signals are not transmitted from the second plurality. The method includes injecting a reference signal having a predetermined injected power level at the first plurality, receiving the reference signal at the second plurality, measuring a received power level of the reference signal at the second plurality, comparing the injected and received power levels, and, responsive to the comparison, setting a gain of at least one of the signal-transmission-elements comprised in the first and second pluralities.

Abstract: In a method and apparatus for controlling registration activity, transmission of a registration message from a node 100 is disabled upon a determination that an identity token is not present within a predetermined area of a memory 130. In an alternative implementation, registration activity is initiated by node 100 upon committing provisioning information, which task may include storing an identity token into predetermined area 130.

Abstract: An antenna sharing system and method. In the illustrative embodiment, the inventive system includes a first matching network coupled to a first circuit; a second matching network coupled to a second circuit; and a switch having a first throw coupled to the first network, a second throw coupled to the second network, and a pole coupled to the antenna. In the specific implementation, the first circuit is a cellular subsystem and the second circuit is a Global Positioning System subsystem. The system further includes a controller for selectively actuating the switch whereby the first network is coupled to the antenna in a first operational mode and the second network is coupled to the antenna in a second operational mode. In the illustrative implementation, the first network provides an impedance match to the switch and the antenna with respect to the first circuit. The second network provides an impedance match to the switch and the antenna with respect to the second circuit.