At+t Corp.

At&t Intellectual Property I, L.p.

At&t Wireless Services, Inc.

Broadcom Corporation

Other

Cingular Wireless Ii, LLC

Chanyu Holdings, LLC

Kapil K Chawla

Xiaoxin Qiu

Li Fung Chang

Justin Che-I Chuang

Nelson Ray Sollenberger

Kin K Leung

Peter Frank Driessen

Reinaldo A Valenzuela

Michael Jeffrey Dunn

Zoran Kostic

Bruce E McNair

Justin C Chuang

Michael Allen Raffel

Masud Kibria

Shailender Timiri

Justin Chi-I Chuang

Bruce Edwin Mcnair

Justin Che-I Chang

A method for improving the performance for a streaming service by link-adaptation and power-control in a wireless packet network such as an Enhanced General Packet Radio Services (EGPRS) cellular network is described. In particular, the effects of a combined link adaptation and power control scheme (referred to as an error-based scheme) for achieving a target error rate, which is non-zero but low enough so that limited retransmission and error concealment techniques are effective, is presented.

Method of using link adaptation and power control for streaming services in wireless networks

A wireless network includes transmission power and data rate adaptation based upon quality experienced by the user.

Wireless network having joint power and data rate adaptation

A system and method for acquiring a transmitted spread-spectrum signal uses a matched filter configuration that is preferably employed as a Stagefilter in the second phase of an initial signal acquisition procedure performed in the receiver. In operation, a Stagefilter matches a sequence which is repeated a number of times according to a second sequence within a secondary synchronization sub-channel of the spread-spectrum signal. The Stagefilter of the invention then filters the output of the Stagefilter in order to recover a secondary synchronization code. The Stagefilters the output of the Stagefilter using three matched filters of its own. The first and second filters sample different taps of a sequence output from the Stagefilter. The third filter samples a predetermined number of taps overlapping taps for the first and second filters in a way that resolves ambiguities with respect to the identification of the sequence. The ambiguity resolution performed by the third filter improves the frequency offset robustness and thus the overall performance of the receiver.

Acquisition matched filter for W-CDMA systems providing frequency offset robustness

This invention provides interference predictions, suitable for least interference dynamic channel assignment use or other frequency hopping uses by de-coupling the time slot assignment and the frequency hopping pattern assignment. In particular, a least interfered time slot is selected based on an aggregate interference measurement performed across an entire transmission band or a pre-specified range of frequencies in the transmission band. A user is assigned a least interfered time slot and provided an appropriate frequency hopping pattern.

Dynamic channel assignment

A wireless network includes transmission power and data rate adaptation based upon signal quality experienced by the user.

A system and method for acquiring a transmitted spread-spectrum signal uses a matched filter configuration that is preferably employed as a Stage 2 filter in the second phase of an initial signal acquisition procedure performed in the receiver. In operation, a Stage 1 filter matches a sequence which is repeated a number of times according to a second sequence within a secondary synchronization sub-channel of the spread-spectrum signal. The Stage 2 filter of the invention then filters the output of the Stage 1 filter in order to recover a secondary synchronization code. The Stage 2 filters the output of the Stage 1 filter using three matched filters of its own. The first and second filters sample different taps of a sequence output from the Stage 1 filter. The third filter samples a predetermined number of taps overlapping taps for the first and second filters in a way that resolves ambiguities with respect to the identification of the sequence. The ambiguity resolution performed by the third filter improves the frequency offset robustness and thus the overall performance of the receiver.

Automated adjustment of system organization parameters in a wireless communication system is provided by determining the parameter settings using a characterization of signal propagation of the system's coverage area. This characterization is based on measurements of path loss-related characteristics by the system's base stations and wireless terminals. An exemplary path loss-related characteristic is path loss as determined by measuring received signal strength (RSS) at wireless terminals based on signals transmitted at known powers by a plurality of the system's base stations. It is possible for the wireless terminals to take measurement while operating in the coverage area, whether idle or during communication with the system, and for such terminals to be associated with the system's subscribers. A resulting characterization of signal propagation in the coverage area based on the measured path loss-related characteristic can then be used to determine a variety of parameter settings.

Method for determining organization parameters in a wireless communication system

A TDMA wireless communication system adjusts the power control target and transmission power based upon link quality to enhance voice capacity. The power can be adjusted in response to the average SNIR and number of decoding errors in a link quality reporting period. The power control target can be increased and decreased in discrete intervals after evaluating the number of decoding errors in the reporting period. The transmission power can be adjusted towards the new power control target based upon the average SNIR.

TDMA communication system having enhanced power control

An arrangement where, in addition to the control channels that are used to set up sessions, there is a logically and physically separate and independent set of control channels that can be used as session control channels. Illustratively, the physical GSM frame arrangement that employs 8 logical slots is used, with one slot both in the uplink and downlink dedicated to these separate control channels. In the downlink, such a control channel provides channel grant information, requests to make and transmit power measurements, poll mobile units, etc. In the uplink, such a control channel can be used to request access to a traffic channel, to report on power measurements, to request special hand-off handling, to respond to polling, etc. Because the uplink session control channel does not need to carry a significant amount of information, the GSM slot can be divided into minislots, with each minislot constituting a session control channel for a group of mobile units.

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Scotch Plains, NJ, United States of America

Kapil K Chawla