Qualcomm Incorporated

Shivratna Giri Srinivasan

Brian Clarke Banister

Supratik Bhattacharjee

Raghu Narayan Challa

Yongle Wu

Won-Joon Choi

Amit Mahajan

Udayan Murli Bhawnani

Sunil Kumar Kandukuri Narayana

Tingfang Ji

Alexei Yurievitch Gorokhov

Masato Kitazoe

Amir Aminzadeh Gohari

Amir Farajidana

Valentin Alexandru Gheorghiu

Michael Lee McCloud

Daniel Amerga

Matthias Brehler

Nitin Pant

Dominique Francois Bressanelli

Mariam Motamed

Muralidharan Murugan

Remi Jonathan Gurski

Joseph C Chan

Kiran Patil

Shengshan Cui

Thomas James Christol

Srivatsa Venkata Chivukula

Raghu Hanumantha Gowda

Sibasish Das

Brandon Allen Burdge

Marian Madan

Vishu Kumar

Osama Nafeth Saleem Alrabadi

Florina Andreea Prisecaru

Sandeep Kumar Sunkesala

Gilbert Anpei Fu

Mohamed Khalifa

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.

Flexible radio resource management (RRM) measurements for wireless networks

Certain aspects of the present disclosure relate to methods and apparatus for wireless communication, and more particularly, to methods and apparatus that utilize one or more user equipment (UE) panic states under connected discontinuous reception (C-DRX) mode in long term evolution (LTE).

User equipment panic state(s) under connected mode discontinuous reception state in long term evolution

Methods, systems, apparatuses, and devices are described for transmitting a measurement report during wireless communications. When, for example, a low-power period (e.g., CDRX OFF period) is scheduled to begin during a time defined by a measurement event timer (TTT timer), a UE may modify the low-power period. The low-power period may be modified based, at least in part on determining the low-power period of the UE will begin during a time defined by a measurement event timer, a duration of the measurement event timer, and a duration of the low-power period. Modifying the low-power period may include delaying the start of the low-power state until after transmission of the MR associated with the measurement event timer or skipping the low-power period altogether. The UE may transmit the MR based, at least in part, on the modification.

Priority management of a measurement event timer and low-power period

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.

Device, method, and apparatus for offline discontinuous reception (DRX) processing with online triggers in cellular systems

Methods and apparatus for resuming operations with an LTE network are described. One example method generally includes suspending operations with a base station of a first radio access technology (RAT) network (e.g., LTE network), tuning to a second RAT network (e.g., 1x network) to monitor for paging messages targeting the UE, and determining whether or not to resume operations with the base station of the first RAT network without performing system acquisition based, at least in part, on how much time has elapsed since suspending operations.

Resume handling after tune-away

Certain aspects of the present disclosure relate to methods and apparatus for Channel Quality Indicator (CQI) reporting after resumption of Long Term Evolution (LTE) after a temporary suspension. In certain aspects, in order to minimize performance penalty to LTE on resumption after an LTE tune away for example to service a different Radio Access Technology, information available from before the LTE tune away may be used in addition to one or more additional parameters for determining how to perform LTE CQI calculation/update after tuning back to LTE. In certain aspects, a decision regarding whether a User Equipment (UE) reports a CQI based on channel conditions before the LTE tune away or reports a CQI based on channel conditions after tuning back to LTE may be based on a value of the Doppler estimate, a time duration of the LTE tune away, or a combination thereof.

Methods and apparatus for determining how to perform operations after communication suspend based on information before the suspend

Methods and apparatus for enhanced radio resource control (RRC) reestablishment in a communication system include addressing repeated radio link failures (RLFs). For example, the methods and apparatus include incrementing a counter value associated with a first cell based on a detection of a RLF by a user equipment (UE) in a RRC connected state with the first cell. The methods and apparatus further include determining that the counter value meets or exceeds a first barring threshold value within a cell barring evaluation time duration. Additionally, the methods and apparatus include prohibiting the UE from performing an RRC reestablishment procedure with the first cell for a first barring time duration.

Addressing radio link failures in wireless communication systems

Methods and apparatus for computing measurement metrics in a wireless communications network are provided. One example method generally includes obtaining a channel impulse response (CIR) from one or more reference signals (RSs) transmitted from one or more antennas of a base station (BS); calculating an absolute square per element of the CIR to generate channel energy response (CER) elements; calculating a threshold value based on a noise variance estimated from a portion of the CER elements; selecting CER elements that exceed the threshold value; and computing a reference signal received power (RSRP) value based on the selected CER elements.

Computation of measurement metrics for wireless networks

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.

Dual frequency tracking loop for OFDMA systems

In a wireless network, a base station (BS) may send a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The synchronization signals may be used by user equipments (UEs) for cell detection and acquisition. A typical searching operation may involve first locating the PSS sequences transmitted by neighboring BSs, followed by SSS detection. Described further herein are algorithms that result in the detection of the PSS and the SSS from a BS. A method for detecting a BS generally includes sampling a received signal from receiver antennas to obtain a sampled sequence, analyzing the sampled sequence to detect a PSS in a current half-frame (HF), calculating signal-to-noise ratio (SNR) metrics based on the detected PSS, combining the calculated SNR metrics with SNR metrics from previous HFs, analyzing the combined SNR metrics to obtain timing information, and analyzing the sampled sequence using the timing information to detect a SSS.

Initial acquisition and neighbor search algorithms for wireless networks

Techniques for making measurements of cells in a wireless network are disclosed. In an aspect, cells to be measured are arranged into groups with different priorities. Groups with higher priority include stronger cells, which are measured more frequently and/or with more filtering to improve measurement accuracy. In one design, a user entity determines a plurality of groups of cells to make measurements. Each group includes at least one cell, and the plurality of groups have different priorities. The user entity determines a measurement interval for each of the plurality of groups of cells, with higher priority groups having shorter measurement intervals. The user entity schedules each cell in each group for measurement at least once (e.g., once) within the measurement interval for that group. The user entity makes measurements for the plurality of groups of cells based on the measurement interval for each group.

Measurement of cells arranged in groups of different priorities

Methods and apparatus for determining a reference sequence and timing based on normalized correlations are described. One example method generally includes receiving, at a first antenna of an apparatus, a first signal comprising a reference sequence; receiving, at a second antenna of the apparatus, a second signal comprising the same reference sequence; sampling the first and second signals to form first and second signal sequences; correlating the first and second signal sequences with each of one or more candidate sequences for the reference sequence using normalization; and determining the reference sequence and timing for the first and second signals based on the normalized correlations.

Searcher detection metrics

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.

Device, method, and apparatus for offline discontinuous reception (DRX) processing in cellular systems

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.

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San Diego, CA, United States of America

Shivratna Giri Srinivasan