| Patent application number | Description | Published |
|---|
| 20080200204 | SYSTEMS AND METHODS FOR BACK-OFF AND CLIPPING CONTROL IN WIRELESS COMMUNICATION SYSTEMS - Systems and methods for controlling transmission power are provided. The systems and methods vary the power of a signal provided to a power amplifier based upon the location of a frequency or frequencies of signals to be transmitted within the transmission frequency band, the location of a hop region within the transmission frequency band, the bandwidth of signals to be transmitted, or combinations of these approaches. | 08-21-2008 |
| 20080225792 | MULTIPLEXING OF FEEDBACK CHANNELS IN A WIRELESS COMMUNICATION SYSTEM - Techniques for sending signaling in a wireless communication system are described. Multiple feedback channels may be multiplexed such that they can share time frequency resources. Each feedback channel may be allocated a different subset of subcarriers in each of at least one tile. In one design, a subscriber station may determine time frequency resources including first and second portions of time frequency resources for first and second feedback channels, respectively. The subscriber station may send vectors of modulation symbols of a first length on the first feedback channel and/or vectors of modulation symbols of a second length on the second feedback channel. A base station may receive the first and second feedback channels and may perform detection on vectors of received symbols for each feedback channel to recover the signaling sent on that feedback channel. | 09-18-2008 |
| 20080227481 | SIGNALING TRANSMISSION AND RECEPTION IN WIRELESS COMMUNICATION SYSTEMS - Techniques for sending and receiving signaling in a wireless communication system are described. Multiple (e.g., eight) vectors of modulation symbols may be defined and may be orthogonal to one another. Multiple subscriber stations may share transmission resources and may simultaneously send different vectors of modulation symbols in the same tile. Each subscriber station may be assigned multiple sets of at least one vector of modulation symbols usable by that subscriber station to convey signaling, e.g., one set of three vectors for acknowledgement (ACK) and another set of three vectors for negative acknowledgement (NAK). Each subscriber station may send one set of at least one vector in at least one tile to convey a signaling value. Different subscriber stations may simultaneously send different sets of at least one vector in the at least one tile to convey their signaling values. | 09-18-2008 |
| 20090022178 | METHODS AND SYSTEMS FOR ADAPTIVE TRANSMISSION OF CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for adaptive transmission of control information in a wireless communication system may include generating a control segment carrying control information. The control segment may have a configurable size. The method may also include generating a pointer for the control segment. The pointer may indicate a location of the control segment in a downlink subframe. The pointer may also indicate a size of the control segment. The method may also include sending the pointer and the control segment. | 01-22-2009 |
| 20090052340 | METHOD AND APPARATUS FOR REQUESTING A CHANNEL MEASUREMENT REPORT IN WIRELESS COMMUNICATION SYSTEMS - A method and apparatus for requesting a ChannelMeasurementReport in a wireless communication system are described. A ChannelMeasurementReportRequest message comprising an 8 bit MessageID field set to “0x07”, a 12 bit PilotPN field wherein the PilotPN field is set to the PilotPN of the sector requesting the measurement report, a 2 bit CarrierID field wherein the CarrierID field is set to the carrier on which the measurements are requested, a 40 bit StartPHYFrame wherein the StartPHYFrame is set to the frame number of the PHYFrame where access terminals are required to being measurements, a 3 bit NumChannels field wherein the NumChannels field is set to the number of channel to be measured, an 8 bit MeasurementsPerMessage field wherein the MeasurementsPerMessage determines the number of measurements to be included in one report message, an 8 bit NumMeasurementsRequested field wherein the NumMeasurementsRequested determines the total number of measurements to be made by access terminal and a 4 bit Reserved field is generated and transmitted over a communication link. | 02-26-2009 |
| 20090124265 | ENHANCED PILOT SIGNAL - Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference. | 05-14-2009 |
| 20090129332 | METHODS AND APPARATUS FOR PROVIDING AN EFFICIENT FRAME STRUCTURE FOR WIRELESS COMMUNICATION SYSTEMS - Providing for an efficient frame structure for wireless communication is disclosed, which may include frequency division multiplexing (FDM) first and second air interfaces in a downlink subframe of a frame, and may also include time division multiplexing (TDM) the first and second air interfaces in an uplink subframe of the frame. | 05-21-2009 |
| 20090213950 | PILOT SIGNAL TRANSMISSION FOR AN ORTHOGONAL FREQUENCY DIVISION WIRELESS COMMUNICATION SYSTEM - Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The pattern allows for improved receipt of the pilot symbols transmitted. In addition, schemes for improving the ability to multiplex pilot symbols without interference and/or biasing from different mobile stations over the same frequencies and in the same time slots. | 08-27-2009 |
| 20090279503 | SYSTEMS AND METHODS FOR MULTIMODE WIRELESS COMMUNICATION HANDOFF - Methods and apparatus for base-station-assisted handover between WiMAX (Worldwide Interoperability for Microwave Access) and CDMA (Code Division Multiple Access) EVDO (Evolution-Data Optimized) or 1xRTT (one times Radio Transmission Technology, or 1x) networks during normal operation of a dual-mode mobile station (MS) are provided. By having a base station (BS) using one radio access technology (RAT) broadcast information about a BS in a neighboring cell employing a different RAT, the methods and apparatus may improve service continuity during handover. | 11-12-2009 |
| 20090279517 | METHODS AND SYSTEMS FOR MULTI-MODE TERMINAL SCANNING - Certain embodiments of the present disclosure provide a method for scanning for paging messages in a second radio access technology (RAT) network, such as a CDMA network, while connected to a first RAT network, such as a WiMAX network. For certain embodiments, an enhanced scanning request message may facilitate establishing a scanning cycle in the first RAT that aligns with a paging cycle of the second RAT. | 11-12-2009 |
| 20090315779 | METHODS AND SYSTEMS FOR FAST RANGING IN WIRELESS COMMUNICATION NETWORKS - A method for efficiently performing ranging in a wireless communication network may be implemented by a mobile station. The method may include sending a ranging code to a base station. The method may also include receiving a ranging response message from the base station. The method may also include determining whether a ranging failure condition is satisfied. The ranging failure condition may relate to something other than a duration of time. The method may further include re-sending the ranging code to the base station if the ranging failure condition is satisfied. | 12-24-2009 |
| 20100008432 | METHODS AND SYSTEMS FOR REDUCING PAPR OF AN OFDM SIGNAL - Certain embodiments of the present disclosure provide a method and an apparatus for peak-to-average power ratio (PAPR) reduction of a transmission signal in a single carrier frequency division multiple access (SC-FDMA) system. The method may utilize a permutation of a time domain signal, and/or a permutation of a frequency domain signal or a permutation of a signal transformed by a unitary matrix. The apparatus may include an M-point DFT or some other M×M unitary matrix, N-point IDFT, interpolation and frequency conversion units, and a pair of possibly different permutation matrices of size M×M, where M can be less or equal than N. | 01-14-2010 |
| 20100067599 | MIMO PREAMBLE FOR INITIAL ACCESS WITH AN UNKNOWN NUMBER OF TRANSMIT ANTENNAS - For certain embodiments, a preamble sequence associated with a particular number of transmit antennas may allow a receiving mobile station to determine the number of transmit antennas used for transmission. The preamble sequence may be selected from one of a set of Constant Amplitude and Zero Auto Correlation (CAZAC) sequences corresponding to all of the supported number of transmit antennas. As a result, a receiving station may be able to determine the sequence sent by correlation and, thereby determine the number of antennas used for transmission. Given the number of transmit antennas, the mobile station may then perform MIMO channel estimation during initial synchronization to recover the channel taps between each transmit and each receive antenna. | 03-18-2010 |
| 20100091915 | METHODS AND SYSTEMS FOR MIMO PREAMBLE DETECTION - Certain embodiments of the present disclosure allow for detection of a transmitted preamble sequence by processing a correlation of a received signal and a preamble hypothesis in a way that exploits the good correlation properties of the known set of preamble sequences. For certain embodiments, the highest peaks of the correlation output may be compared across all preamble hypotheses to decide which preamble sequence is transmitted. | 04-15-2010 |
| 20100128617 | METHOD AND APPARATUS FOR TWO-WAY RANGING - The subject matter disclosed herein relates to a system and method for wirelessly receiving a first communication from a first mobile device. A processing delay may be measured. An acknowledgement communication indicating receipt of the first communication may be generated. A measurement of the processing delay may be broadcast in a broadcast packet, for example, or by transmitting a subsequent communication including the processing delay in response to receiving a second communication having a request for the measurement of the processing delay. | 05-27-2010 |
| 20100128637 | NETWORK-CENTRIC DETERMINATION OF NODE PROCESSING DELAY - Apparatus and methods are directed to calibrating a delay within a wireless access point for determining a position of a mobile station. One method includes receiving an initial packet at an eavesdropping device, receiving a response packet, sent by another entity, at the eavesdropping device, computing a time difference based upon the packet arrival times, and providing the time difference to a position determination entity. Another method includes providing a request to appropriate eavesdropping devices to send information, receiving, from each appropriate eavesdropping device, a time difference which represents a difference in a time of arrival of a packet transmitted by the wireless access point and a time of arrival of a packet transmitted by the mobile station, determining a processing delay estimate based upon the time differences, and determining a position of the mobile station based upon the processing delay estimate and the received time differences. | 05-27-2010 |
| 20100130229 | WIRELESS-BASED POSITIONING ADJUSTMENTS USING A MOTION SENSOR - Apparatuses and methods for adjusting wireless-derived positions of a mobile station using a motion sensor are presented. One method includes estimating a position of a mobile station based upon wireless signal measurements and measuring a movement of the mobile station using a relative motion sensor. The method further includes detecting a displacement of the mobile station based upon the measured movement, determining that the displacement is below a threshold and then adjusting the estimated position of the mobile station using information from the relative motion sensor. An apparatus includes a wireless transceiver, a relative motion sensor, a processor coupled to the wireless transceiver and the relative motion sensor, and a memory coupled to the processor. The memory stores executable instructions and data for causing the processor to execute methods for adjusting wireless-derived positions using a motion sensor. | 05-27-2010 |
| 20100130230 | BEACON SECTORING FOR POSITION DETERMINATION - Apparatuses and methods for sector-based position determination of a mobile station are presented. One method includes determining an estimate of a distance between the mobile station and at least one wireless access point (WAP), receiving sector information which describes sectors associated with the at least one WAP, and combining the distance estimate and sector information to determine a position of the mobile station. One apparatus includes a wireless transceiver, a processor coupled to the wireless transceiver, and a memory coupled to the processor which stores executable instructions and data. The instructions cause the processor to determine an estimate of a distance between the mobile station and at least one wireless access point (WAP), receive sector information which describes sectors associated with the at least one WAP, and combine the distance estimate and sector information to determine a position of the mobile station. | 05-27-2010 |
| 20100135178 | WIRELESS POSITION DETERMINATION USING ADJUSTED ROUND TRIP TIME MEASUREMENTS - One method for wirelessly determining a position of a mobile station includes measuring a round trip time (RTT) to a plurality of wireless access points, estimating a first distance to each wireless access point based upon the round trip time delay and an initial processing time associated with each wireless access point, estimating a second distance to each wireless access point based upon supplemental information, combining the first and second distance estimates to each wireless access point, and calculating the position based upon the combined distance estimates. Another method includes measuring a distance to each wireless access point based upon a wireless signal model, calculating a position of the mobile station based upon the measured distance, determining a computed distance to each wireless access point based upon the calculated position of the mobile station, updating the wireless signal model, and determining whether the wireless signal model has converged. | 06-03-2010 |
| 20100254354 | Softer and Soft Handoff in an Orthogonal Frequency Division Wireless Communication System - Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The patterns may be selected according to a location of the mobile station with respect to one or more antennas are provided. In some aspects, the pattern may be selected based upon the distance between the mobile station and the one or more antennas. In other aspect, the pattern may be based upon whether the mobile station is in handoff. | 10-07-2010 |
| 20100329310 | LOW COMPLEXITY BEAMFORMING FOR MULTIPLE ANTENNA SYSTEMS - Methods and apparatuses are disclosed that utilize the discrete Fourier transform of time domain responses to generate beamforming weights for wireless communication. In addition, in some embodiments frequency subcarriers constituting less than all of the frequency subcarriers allocated for communication to a user may utilized for generating the beamforming weights. | 12-30-2010 |
| 20110019649 | METHODS AND SYSTEMS FOR MOBILE STATION LOCATION DETERMINATION IN WIMAX - Certain embodiments of the present disclosure provide techniques for determining and communicating the location of a mobile station within a wireless communication system. | 01-27-2011 |
