Patent application number | Description | Published |
20100330992 | Device, Method, and Apparatus for Offline Discontinuous Reception (DRX) Processing With Online Triggers in Cellular Systems - An apparatus and method for processing signals are disclosed. The apparatus may include a transceiver configured to receive a first paging signal during a first cycle, a memory, and a processor configured to store the received first paging signal in the memory, to switch the transceiver to an off state after the first paging signal is stored in the memory, to process the stored first paging signal while the transceiver is in the off state, and to determine whether to enter an online mode based on the processing. | 12-30-2010 |
20100331019 | Device, Method, and Apparatus for Offline Discontinuous Reception (DRX) Processing in Cellular Systems - An apparatus and method for processing signals are disclosed. The apparatus may include a transceiver configured to receive a first paging signal during a first cycle, a memory, and a processor configured to store the received first paging signal in the memory, to switch the transceiver to an off state after the first paging signal is stored in the memory, and to process the stored first paging signal while the transceiver is in the off state. | 12-30-2010 |
20110149943 | TIME TRACKING LOOPS FOR A COMMUNICATION SYSTEM UTILIZING A CYCLIC PREFIX - Techniques for performing time tracking in a communication system utilizing a cyclic prefix are described. In an aspect, a receiver may detect for large timing errors based on early and late received samples obtained with early and late FFT windows, respectively. The receiver may derive first and second channel impulse response (CIR) estimates based on the early and late received samples, respectively, determine an early channel energy based on the first CIR estimate, determine a late channel energy based on the second CIR estimate, compute an update amount based on the early and late channel energies, and update the FFT window position based on the update amount. In another aspect, the receiver may perform time tracking with an inner time tracking loop (TTL) and an outer TTL. The receiver may update the FFT window position in coarse steps with the outer TTL and in fine steps with the inner TTL. | 06-23-2011 |
20110158342 | TIME TRACKING FOR A COMMUNICATION SYSTEM UTILIZING A CYCLIC PREFIX - Techniques for performing time tracking in a communication system utilizing a cyclic prefix are described. In an aspect, a receiver may perform time tracking and determine an FFT window position based on a metric related to inter-symbol interference (ISI) and inter-carrier interference (ICI). The receiver may determine an early energy for signal paths earlier than the current FFT window position, determine a late energy for signal paths later than the current FFT window position, determine the metric based on the early and late energies, compute an update amount for the FFT window position based on the metric, and update the FFT window position based on the update amount with a time tracking loop (TTL). In yet another aspect, the receiver may compute the FFT window position based on a channel impulse response (CIR) estimate directly, without using a TTL. | 06-30-2011 |
20110158367 | DUAL FREQUENCY TRACKING LOOP FOR OFDMA SYSTEMS - Methods and apparatus for correcting frequency errors between a carrier frequency of a signal received by a wireless device and a reference frequency local to the device. For certain aspects, such a method generally includes receiving a signal in a receiver having an LO producing a reference frequency, a radio frequency (RF) phase-locked loop (PLL), and a digital rotator, estimating a frequency difference between a carrier frequency of the received signal and the LO reference frequency, and applying the estimated frequency difference to the RF PLL and the digital rotator. | 06-30-2011 |
20130107785 | TRACKING LOOP ENHANCEMENTS FOR MITIGATING SIGNAL INTERFERENCE AND ADJUSTING SIGNAL POWER | 05-02-2013 |
20130155883 | METHOD AND APPARATUS FOR PERFORMING FREQUENCY SCAN FOR WIRELESS SYSTEMS WITH VARIABLE CHANNEL BANDWIDTH - Techniques for performing a frequency scan to detect wireless systems operating on frequency channels with variable bandwidths are disclosed. In one aspect, a user equipment (UE) performs a frequency scan for a plurality of frequency channels and measures the received power of each frequency channel based on a center frequency and a bandwidth of the frequency channel. The UE identifies candidate frequency channels for acquisition based on the results of the frequency scan. In another aspect, a frequency scan of a band is performed by partitioning the band into multiple segments, measuring received powers of subcarriers or raster frequencies within each segment, and concatenating received powers of subcarriers or raster frequencies for all segments. A frequency scan is then performed based on the concatenated results for the multiple segments. | 06-20-2013 |
20130196603 | FLEXIBLE RADIO RESOURCE MANAGEMENT (RRM) MEASUREMENTS FOR WIRELESS NETWORKS - Methods and apparatus for performing reference signal (RS) metric measurements in different parts of a channel bandwidth are described. One example method generally includes receiving signaling indicating one or more frequency bands within an operating frequency band of a current serving cell for performing reference signal (RS) metric measurements, performing the measurements on the one or more frequency bands, and reporting the measurements. | 08-01-2013 |