Motorola Mobility LLC

Motorola Corporation

Google Inc.

Google Technology Holdings LLC

Nick W Whinnett

Weimin Xiao

Fei Tong

Robert T Love

Robert Mark Harrison

Rapeepat Ratasuk

Amitava Ghosh

Mansoor Ahmed

Fan Wang

Zhijun Cai

Frederick W Vook

Timothy J Wilson

Stephen Lee Spear

Amitabha Ghosh

Stanley J Benes

David Charles Padfield

Chandrasekar Sankaran

Jean-Aicard Fabien

Richard Tonge

In a 3Generation Partnership Project, 3GPP, communication system a base station comprises a scheduler allocating communication resource of at least one of a Physical Uplink Shared CHannel, PUSCH, and a Physical Downlink Shared CHannel, PDSCH to a User Equipment (UE). The scheduling may either be a dynamic scheduling wherein a resource allocation for a single frame is provided to the UE or a persistent scheduling wherein a resource allocation for a plurality of frames is provided to the UE. A resource allocator assigns resource of a Physical Uplink Control CHannel, PUCCH, to the UE dependent on whether dynamic scheduling or persistent scheduling is performed by the scheduler for the UE. The UE transmits uplink control data on a physical uplink channel which is selected as the PUCCH or the PUSCH in response to whether persistent scheduling is used for the UE. The invention allows e.g. reduced PUCCH loading.

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A method, system and communication network for transmitting information signals via uplink (UL) collaborative SDMA, in a wireless communication system. Base station receiver estimates a channel gain associated with the transmission path(s) of each user and keeps a matrix of normalized covariance, between users. Based on the estimated channel gain and the normalized covariance, ULS utility is able to compute channel capacity. Based on capacity estimates of (1) the multiplexed user signals and (2) the individual user signals, signals are either multiplexed for UL SDMA or are transmitted individually. An optimal selection of multiplexed signals may be based upon: (1) a cross user interface measurement; and (2) a selection mechanism based on eigen-decomposition techniques. The ULS utility enables a UL scheduler to pair information signals with clear spatial distinction and minimal correlation, based on capacity evaluations.

Uplink spatial division multiple access (SDMA) user pairing and scheduling

Use of the physical uplink control channel in a 3rd generation partnership project communication system

A base station () operates a hybrid retransmission scheme for a communication to a first subscriber unit () over a communication channel of an air interface of a cellular communication system. The base station () comprises a retransmission parameter controller () which sets a transmission parameter, such as a transmit power or an error correcting scheme, for a transmission of the communication in response to an operating point for the retransmission scheme. A CQI processor () determines a channel quality indication for the communication channel and a variation processor () determines a variation measure of a variation of the channel quality indication. The variation measure can for example be a rate of change. An operating point controller () sets the operating point in response to the variation measure. The invention may allow improved setting of transmission parameters for initial transmissions thereby providing higher throughput, reduced resource consumption and reduced delay.

Retransmission in a cellular communication system

An apparatus comprises a detection processor () for detecting retransmission feedback messages in response to a detection threshold. A threshold processor () determines the detection threshold in response to a noise estimate generated by a noise processor (). The noise processor comprises a sub-symbol generator () which divides a retransmission feedback symbol into a plurality of sub-symbols. Each of the sub-symbols is despread by a spreading code with a lower spreading factor than a spreading factor of the retransmission feedback symbol. A difference generator () then generates difference symbol values between the plurality of sub-symbols and a noise estimator () generates the noise estimate in response to the difference symbol values, for example by determining the variance of the difference symbol values. An improved noise estimate may be determined resulting in improved detection performance and thus improved retransmission performance.

The present invention provides a system and method for transmit beamforming in a Frequency Division Duplex communication system. A first step () includes correcting for differences between transceiver receive and transmit responses within a base station. A next step () obtaining a beamforming weight of a phase antenna array on an uplink. A next step () transforming the uplink beamforming weight a downlink beamforming weight by applying a phase correction that is a function of wavelength at the uplink and downlink frequencies and distance between antenna elements.

Frequency transformation based transmit beamforming in a communication system

A system and method for to establish a wireless group call from one of a plurality of communication units to others communication units includes a first step of receiving, from a requesting communication unit a request for a group call with other communication units of the group. A next step includes allocating a common downlink channel for the group call. A next step includes allocating a dedicated uplink channel for the requesting communication unit. A next step includes switching one of the communication units between the common channel mode and a dedicated channel mode depending upon performance criteria.

Group call service using broadcast radio bearer

A cellular communication system includes first and second base stations and a user equipment. A Radio Network Controller controls a handover of the user equipment between the base stations by either forwarding data of the communication to both the first and second base stations or to only one of the first and second base stations dependent on a Quality of Service (QoS) characteristic of the communication of the user equipment. The QoS characteristic can specifically be an indication of a delay constraint for the communication service such as an indication of whether the service is a real-time service or a non-real time service.

Handover in a cellular communication system

A method () and apparatus () provide for rapid power control based on a quality related value, e.g. channel quality indicator (CQI) value. A transmit power level can be derived from a CQI value received according to a time period, e.g. corresponding to 500 Hz. A first predicted value can be predicted based on the CQI value, at a first time within the time period and a power adjustment value can be determined based on the CQI value as well as the first predicted value at a rate that exceeds the rate of receiving the CQI values. Note that other predicted values for or corresponding to the CQI value can be predicted at other times within the time period and that power adjustment values can be determined through interpolation between predicted values for any time within the period.

Rapid channel quality based power control for high speed channels

A method of and apparatus for adapting an antenna array for closed loop transmit diversity, the method comprising: receiving an adapting signal corresponding to an antenna array weighting pattern for a time period; demodulating the adapting signal to provide a symbol for the time period; determining a preferred symbol from the symbol for the time period and a previous symbol for a previous time period; and transmitting with an antenna array weighting pattern corresponding to the preferred symbol.

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Marlborough, United Kingdom

Nick W Whinnett