Qualcomm Incorporated

Daisuke Terasawa

Edward George Tiedemann, Jr

Avneesh Agrawal

Jack M Holtzman

Serge D Willenegger

Stein Arne Lundby

Sandip Sarkar

Da-shan Shiu

Francesco Grilli

Sivarama Krishnan Venkatesan

Joseph P Odenwalder

Yu-Cheun Jou

Deepu John

Hao Liu

Qiuzhen (Joe) Zou

Shailesh Maheshwari

Amir Aminzadeh Gohari

Arak Sutivong

Thomas Klingenbrunn

Uppinder Singh Babbar

Bao Vinh Nguyen

Andrew Sendonaris

Leonid Razoumov

Nitin Kasturi

Alok Mitra

Vaibhav Kumar

Subramanya P Rao

Abhijit G Shanbhag

Mathias Kohlenz

Sandeep Urgaonkar

Edward G Tiedemann

Gwang-Hyun Gho

Rajat Rajinderkumar Dhawan

Iain Finlay

David Patterson

Mohammed M Rumi

Pavathanathan Subrahmanya

Stein A Lunby

Gautam Sheoran

Abihijit Shanbhag

Aspects of the present disclosure provide methods and apparatus for offloading checksum processing in a user equipment (UE) (e.g., from an application processor to a modem processor). Such offloading may speed up packet processing, increase data rate, and/or free up resources of the application processor for other tasks.

Methods and apparatus for offloading checksum processing

A method and apparatus for determining an operational mode for use in a wireless communication system based on a location, a velocity, or both, of a wireless communication device (WCD) in relation to a wireless network infrastructure is described. The selected mode can be used by various devices within the communication system. Modes that are selected include transmit diversity and site selection diversity.

Utilizing speed and position information to select an operational mode in a wireless communication system

A novel and improved method and apparatus, in a WCDMA communication system, for informing a mobile station of a downlink data frame time offset by determining the downlink data frame time offset, and transmitting the downlink data frame time offset via an Active Set Update message transmitted from a cell to mobile station. Once an Active Set Update message is received, the data frame time offset information is provided to a timing block which may determine data frame boundary of each downlink signal. Timing block may then adjust the PN sequence timing corresponding to the downlink signal associated with the data frame time offset such that corresponding data symbols in each data frame are correctly soft combined in a combiner.

Method and apparatus in a CDMA communication system

Techniques for efficient searching in asynchronous systems, such as W-CDMA, as well as multi-mode searching, are disclosed. In one aspect, step one and step three search are performed in a single search engine. In another aspect, a search engine is configurable to search the offsets of a slot in step one search, producing sequential hypothesis energies, and peak detecting and sorting those energies. In yet another aspect, the peak detector and sorter are configurable to perform step one searching or step three/multimode searching. Various other aspects of the invention are also presented. These aspects have the benefit of circuit area and search-time efficiency which translate into reduced costs, increased standby time, increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.

Steps one and three W-CDMA and multi-mode searching

A novel and improved method and apparatus, in a WCDMA communication system (), for informing a mobile station () of a downlink data frame time offset by determining the downlink data frame time offset, and transmitting the downlink data frame time offset via an Active Set Update message transmitted from a cell (or) to mobile station (). Once an Active Set Update message is received, the data frame time offset information is provided to a timing block () which may determine data frame boundary of each downlink signal. Timing block () may then adjust the PN sequence timing corresponding to the downlink signal associated with the data frame time offset such that corresponding data symbols in each data frame are correctly soft combined in a combiner().

The invention is a method for limiting the peak transmit power in a CDMA communication system. At least one of first and second high transmit power regions are separated into a plurality of high transmit power subregions. The high transmit power subregions of the plurality of high subregions are shifted by time offsets of differing durations to provide a plurality of time offset subregions. First and second low transmit power regions are also provided. At least one of the first and second low transmit power regions is also separated into a plurality of transmit power subregions and the low transmit power subregions are shifted by time offsets of differing time durations. The subregions can be time offset by a predetermined time duration or by a random time duration.

Signal splitting method for limiting peak power in a CDMA system

A method and apparatus for using information about a mobile terminal's location relative to a base station can improve performance of a communication system. In addition, information about the mobile terminal's velocity relative to the base station may be used to improve performance of the communication system. The location information may be used to estimate a nominal PN offset, and a set of PN offset to use, for processing communication signals. The velocity information may be used to estimate a nominal frequency of the communication signals.

Communication system performance using position location information

An improved method for facilitating handoff between an asynchronous and a synchronous base station. A method for determining a pilot channel PN offset of a pilot channel transmitted by a wireless base station. In a first embodiment, the method includes correlating a PN sequence with a received pilot signal to acquire a PN frame timing, receiving at least one search code burst aligned with the PN frame timing, the at least one search code burst signifying the pilot channel PN offset, and comparing the at least one search code burst to a set of codewords, each codeword representing a predetermined PN offset. From the search code bursts, the mobile station is able to quickly determine the PN offset of the transmitting base station, and thereby identify it. Methods for transmitting a complementary set of forward link channels are also disclosed.

Method for handoff between an asynchronous CDMA base station and a synchronous CDMA base station

A novel and improved method and apparatus, in a WCDMA communication system (), for informing a mobile station () of a downlink data frame time offset by determining the downlink data frame time offset, and transmitting the downlink data frame time offset via an Active Set Update message transmitted from a cell (or) to mobile station (). Once an Active Set Update message is received, the data frame time offset information is provided to a timing block () which may determine data frame boundary of each downlink signal. Timing block () may then adjust the PN sequence timing corresponding to the downlink signal associated with the data frame time offset such that corresponding data symbols in each data frame are correctly soft combined in a combiner ().

Techniques for efficient W-CDMA modulation are disclosed. In one aspect, a multiplexing/coding chain for use in modulation such as that defined by the W-CDMA specification is disclosed. In another aspect, transport blocks are processed and concatenated, utilizing memory efficiently. This aspect has the further benefit of preparing transport channels for efficient subsequent processing. It also allows for ease of interface with the transport channel source. In another aspect, the use of repeated channel coding is used in lieu of an interleaver memory to provide channel coding and interleaving. These aspects, collectively, yield the advanced benefits of a system, such as W-CDMA, in a hardware efficient manner. The techniques described herein apply equally to both access points and access terminals. The techniques are not limited to W-CDMA systems; they are quite suitable to other systems requiring the various benefits the invention offers. Various other aspects of the invention are also presented.

Method and apparatus for W-CDMA modulation

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San Diego, CA, United States of America

Daisuke Terasawa