Arraycomm, Inc.

Intel Corporation

Atheros Communications, Inc.

Craig H Barratt

Christopher Richard Uhlik

Mitchell D Trott

David M Parish

Athanasios Agamamnon Kasapi

Tibor Boros

Michael Youssefmir

Louis C Yun

Richard H Roy, Iii

Stephen J Sifferman

Marc H Goldburg

Stephen P Boyd

Farhad Farzaneh

William John McFarland

Jeffrey M Gilbert

Alain M Chiodini

John T Orchard

Bjorn E Ottersten

Kamaraj Karuppiah

Michael S Y Wong

Chinping Q Yang

Stephen Boyd

Youssefmir Michael

David M Parrish

Richard H Roy

Richard H Iii Roy

Björn E Ottersten

In one embodiment, the present invention comprises transmitting a broadcast burst in a broadcast channel from a base station of a radio communications system. The invention further comprises receiving a request burst from a user terminal, and transmitting a message burst from the base station to the user terminal from which the request was received. The message burst includes a description of the channels available on the radio communications system for receiving messages from user terminals.

Radio communications system with a minimal broadcast channel

Methods and apparatus implementing spatial processing in a remote unit. In general, in one aspect, a remote unit in accordance with the invention includes a spatial processing unit to process signals received by a plurality of antennas.

Remote unit for providing multiple-mode spatial processing

A system and method are described for repeatedly and efficiently performing a wireless communication channel survey to determine whether comparable communications devices exist, which frequencies are in use, and the identities of the comparable communications devices. A beacon data table stores received beacon data which is used to predict beacon arrival times, thereby allowing a receiver to be tuned away from an active data communications channel for a shorter dwell time than a beacon period. A further efficiency can be gained if beacon generators cooperatively stagger their beacon times according to one or more measurable characteristics of the beacon generator, e.g. the operating channel number and the SSID.

Efficient communication channel survey

Remote unit for providing spatial processing

Methods and apparatus implementing spatial processing in a remote unit. In general, in one aspect, the present invention provides a remote unit, that includes a plurality of antennas and a spatial processing unit coupled to the plurality of antennas. The remote unit also includes a performance determination unit to determine a performance of the remote unit and a feedback adjustment unit to adjust feedback transmitted from the remote unit to a device, wherein the adjusted feedback accounts for performance associated with the spatial processing unit.

Method and apparatus for adjusting feedback of a remote unit

Methods and apparatuses, including computer program products, for spatial processing in a radio receiver. One embodiment is a radio receiver for operation in a wireless communication system. The radio receiver may include a receive processing unit to process signals received by an antenna array by applying a selected spatial processing mode of a plurality of spatial processing modes. The modes include one or more modes of one or more spatial processing methods. The receiver also includes a selector to select the spatial processing mode from the plurality of spatial processing modes. The selecting includes selecting the spatial processing method in the case that the set of spatial processing modes are of more than one spatial processing method.

Method and apparatus to provide multiple-mode spatial processing in a radio receiver

A method of minimizing collisions in a CSMA/CA wireless data communication system using an access point includes sensing the presence of a client desirous of communication with the access point. A start time slot list having at least one unique start time slot during which the client may begin transmitting can be allocated. The start time slot list to the client can be transmitted. A transmission from the client can be received, wherein such transmission begins only during the start time slot(s) indicated by the start time slot list. Notably, the start time slot list can include a high-priority start time slot and a low-priority start time slot substantially equally displaced in time from a center start time slot. A client capable of receiving the start time slot list can select between the high-priority start time slot and the low-priority start time slot based on a randomizing function.

Apparatus and method for transmission collision avoidance

A data stream is transmitted between a base station and user terminal. A first resource that is available to transmit a page is selected at the base station and the page transmitted from the base station via the first resource. The page is received at the user terminal via the first resource and a second resource that is available to transmit a page response is selected at the user terminal. A page response is transmitted from the user terminal via the second resource in response to the page. A data stream is then transmitted between the base station and user terminal via a third resource. In one embodiment, the first, second and third resources utilize the same sequence of radio frequency resources that follow a hopping sequence among a set of available radio frequency resources. In one embodiment, at least two of the first, second and third resources utilize the same sequence of radio frequency resources. In yet another embodiment, the resources utilize different sequences of radio frequency resources.

Resource allocation in a wireless network

Dynamic conditions present in a channel can quickly degrade signal quality, thereby reducing the data rate usable by a WLAN transmitter. For maximum throughput, the highest, reliable data rate available should be used. In accordance with one feature of an adaptive rate technique, a lookup RSSI from one or more acknowledgment packets can be determined. One or more valid data rates can then be determined, wherein a valid data rate has an RSSI threshold less than or equal to the lookup RSSI. An achievable throughput can be computed for each valid data rate based on a theoretical rate and a packet error rate (PER). The valid data rate having the highest achievable throughput can be chosen as the new transmission rate. A rate control table, which can include RSSI thresholds, UDP rates, and PERs for each supported data rate, can be updated based on actual transmission information.

Wireless LAN using RSSI and BER parameters for transmission rate adaptation

A wireless communication system operates in a combined FDD and TDD mode. During a first time period, data may be transmitted at a first frequency band and received at a second frequency band. During a second time period, data is transmitted at the second frequency band and received at the first frequency band. The first and second time periods may be of identical durations, thereby creating a 50% duty cycle. When the base station operates with multiple frequency bands, spatial processing parameters such as the spatial signature or copy weights of the mobile stations may be collected in all frequency bands, thereby allowing the full processing advantage of adaptive antenna.

Operating time division duplex (TDD) wireless systems in paired spectrum (FDD) allocations

This invention relates to a method and apparatus for transmitting a downlink signal from a communication station to one or more subscriber units to achieve a desired radiation level over a desired sector (e.g., everywhere), the communication station including an array of antenna elements and one or more signal processors programmed (in the case of programmable signal processors) to weight the downlink signal according to one of a sequence of complex valued weight vectors. The method includes sequentially repeating transmitting the downlink signal, each repetition with a different weight vector from the sequence until all weight vectors in the sequence have been transmitted with. The sequence is designed for achieving the desired radiation level during at least one of the repetitions. In this way, every user in the desired region is transmitted to in the time period.

Downlink broadcasting by sequential transmissions from a communication station having an antenna array

Methods and apparatuses, including computer program products, for spatial processing in a remote terminal unit. One embodiment is a wireless remote terminal receiver in a wireless terminal unit for operation in a wireless communication system. The wireless remote terminal receiver includes an antenna array, and a receive processing unit to process signals received by the antenna array by applying a selected spatial processing mode of a plurality of spatial processing modes. The modes include one or more modes of one or more spatial processing methods. The receiver also includes a selector to select the spatial processing mode from the plurality of spatial processing modes. The selecting includes selecting the spatial processing method in the case that the set of spatial processing modes are of more than one spatial processing method.

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Redwood City, CA, United States of America

Craig H Barratt