Lucent Technologies Inc.

Alcatel Lucent

Alcatel-Lucent USA Inc.

Robert Atmaram Soni

R Michael Buehrer

Roger David Benning

Sridhar Gollamudi

Emad N Farag

Mohammad Riaz Khawer

Paul Anthony Polakos

Jiann-An Tsai

Gopal N Kumar

Stephen Alan Allpress

Yigang Cai

Fang-Chen Cheng

Harish Viswanathan

Colin Leon Kahn

Lei Song

Pantelis Monogioudis

Anil M Rao

Quinn Li

Jean-Michel Pugeat

Nallepilli S Ramesh

Steven P Nicoloso

Thierry Billon

Dirck Uptegrove

Tracey G Dwyer

Richard L Davies

Kam Hung Wu

Rich Davies

Victor Da Silva

Frederick Deville

Noah Jacobsen

Ilya Alexander Korisch

A method of operating a first network element in a wireless communications network to perform WIFI and long term evolution (LTE) communications with a second network element on an unlicensed portion of a radio spectrum, the unlicensed portion being divided into first and second frequency regions, includes performing, at the first network element, WIFI protocol communications over the unlicensed portion, including at least one of transmission to, and reception from, a second network element, of WIFI protocol data using one or more first frequencies of the first frequency region, and performing, at the first network element, LTE protocol communications over the unlicensed portion including at least one of transmission to, and reception from, the second network element, of LTE protocol data using one or more second frequencies of the second frequency region, the WIFI protocol communications and LTE protocol communications being performed by the first network element simultaneously.

Network element and method of operating the same

User equipment aggregates connections in at least one of a first unlicensed frequency band and a second unlicensed frequency band with a connection in a licensed frequency band to form a wireless backhaul connection to the user equipment. The user equipment selectively allocates a third unlicensed frequency band to a tethering connection.

Allocation of unlicensed frequency bands for a wireless hotspot

A user equipment determines a set of licensed and unlicensed frequency bands that are available for wireless communication. The user equipment selects a first subset of the set as targets for a handover involving at least one unlicensed frequency band and transmits information indicating the first subset. A base station receives information indicating a first subset of a set of licensed and unlicensed frequency bands. The first subset are targets for a handover of user equipment involving at least one unlicensed frequency band. The base station selects a second subset based on the first subset and transmits information indicating the second subset.

User equipment assisted handover in licensed and unlicensed frequency bands

In one embodiment, a message is sent from the wireless network to a user equipment having a variable rate vocoder. The message defines transport block sizes for the user equipment to select from in making uplink transmissions if the user equipment is permitted to vary a packet size for uplink transmission. A scheduling grant is sent to the user equipment, and the scheduling grant includes an indicator indicating that the user equipment is permitted to vary the packet size for uplink transmissions by selecting a transport block size from among the defined transport block sizes.

Method to improve voice over IP capacity for user equipment employing variable rate vocoders

Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected. The interference is symbol interference from an earlier successfully decoded user's symbols. The user symbol interference is determined by cross correlations.

Interference cancellation with a time-sliced architecture

A method of determining coverage areas in a communication system includes determining, by a controller, a plurality of base stations in the communication system and determining, by the controller, a Voronoi region for each of the plurality of base stations. The Voronoi region corresponds to the coverage area for the base station. Each location in the Voronoi region is closest to the base station than any other base station of the plurality of base stations.

Methods of determining coverage areas

The present invention provides a method of determining handoff parameters. One embodiment of the method includes determining values of a hysteresis for a handoff from a serving cell, one or more pairwise offset values for hand off between the serving cell and one or more neighbor cells, and one or more times-to-trigger (TTTs) for hand off between the serving cell and the neighbor cell(s). The values may be determined So that hand off is triggered beyond a first distance from the serving cell selected to avoid ping-ponging and within a second distance from the serving cell selected so that a mobile unit moving at a selected velocity does not travel beyond a third distance within the TTT.

Method of determining wireless hand off parameters

In a system for parity encoding data using a low density parity check (LDPC) code, a rate-compatible, irregular LDPC code is generated by extending a base code using a constrained edge growth operation and a parity splitting operation. The base code is a 'daughter' code having an encoding rate higher than a designated rate of the LDPC code. The daughter code is progressively extended to lower and lower rates such that each extension code (including the target LDPC code) is compatible with the previously obtained codes. The extension operation may involve introducing a set of new code symbols to the daughter code, by splitting check nodes of a base graph associated with the daughter code, and through constrained edge growth of the base graph. The LDPC code is used to parity encode a data message as a means for forward error correction across a communication channel.

Method and system for encoding data using rate-compatible irregular LDPC codes based on edge growth and parity splitting

Spatial Division Multiple Access (SDMA) may be implemented in both the forward and reverse link directions through the use of, for example, a sector-wide primary pilot channel and one or more beamformed secondary pilot channels (secondary pilot channel).

High rate packet data spatial division multiple access (SDMA)

The present invention provides a method of processing a baseband signal including user signals transmitted by a plurality of users. The method includes applying frequency offset compensations to the baseband signal, thereby to form respective frequency-shifted baseband signals. Each frequency compensation shifts the baseband signal by a multiple of a selected frequency offset and each resulting frequency-shifted baseband signal includes frequency-shifted user signals. The method also includes assigning at least some of the frequency-shifted user signals to groups. Each group corresponds to one of the frequency compensations and the assignment is carried out so that each group includes frequency-shifted user signals that have an estimated frequency offset that lies within a range determined by the corresponding frequency compensation. The method further includes estimating a frequency offset of each of the user signals based on the frequency-shifted user signal and the frequency compensation of the group including the frequency-shifted user signal.

Method of frequency offset compensation

An antenna array includes four closely spaced, linearly arranged antenna columns. At least two of the columns, e.g., the center two columns, are dual-polarized. Spacing between neighboring columns is about &#xbd;&#x3bb;, where &#x3bb; is the free space wavelength at the network carrier frequency. Each column includes a first vertical linear array of radiating elements or groups of elements (sub-arrays) connected to a port. The dual-polarized columns each further include a second linear array of radiating elements oriented at a different polarization than the first array. (For example, horizontal/vertical or slant 45&#xb0;.) Array ports are connected with four RF feed cables using duplexers in such a way so as to provide two different antenna configurations for forward link and reverse link frequencies, namely, a four-column closely spaced beam-forming array at the forward link and a two-column dual-polarized array at the reverse link for 4-branch diversity reception.

Multiple-element antenna array for communication network

Downlink diversity in a CDMA system is provided by employing Walsh codes in conjunction with M transmit antennas at a common base station serving K mobiles, where M may or may not be to equal to K. The present invention provides methods and apparatus for improving downlink diversity in a CDMA system. Each transmit antenna transmits a signal representing the result of the modulation of Walsh codes by data signals for each of the K mobiles, assuming there is data pertaining to a particular mobile. The assignment of Walsh codes is accomplished in accordance with a transmission matrix T. The transmission matrix maps the user data symbols onto the Walsh codes for each antenna and is preferably designed such that its columns are representative of the transmit antennas and orthogonal. Thus, at a given mobile, the mobile need only correlate with M different Walsh codes since each transmit signal received contains a component that is the result of M different Walsh codes having been modulated by a data signal associated with that particular mobile. The set of Walsh codes to select from includes 2Walsh codes. However, with respect to any given mobile, there is needed only as many different Walsh codes as there are transmit antennas serving the particular mobile. The results of the respective M correlations are combined and, with obtained channel estimates, the receiver estimates the particular data pertaining to that particular mobile so that it can be provided to the user. Also, the present invention provides for various ways to estimate the respective channels between the M transmit antennas and a mobile. It is to be appreciated that the downlink diversity techniques of the invention may be applied to the physical layer proposed in the IS95-C physical layer draft proposal.

Methods and apparatus for downlink diversity in CDMA using Walsh codes

Disclosed is a method and apparatus of transmit diversity that is backward compatible and does not significantly degrade performance in additive white guassan noise (AWGN) conditions using a transmission architecture that incorporates a form of phase sweep transmit diversity (PSTD) referred to herein as biased PSTD. Biased PSTD involves transmitting a signal and a frequency swept version of the same signal over diversity antennas at different power levels. By transmitting the two signals at different power levels, the depths of nulls normally seen in AWGN conditions when PSTD is utilized is reduced and performance degradation in AWGN conditions is mitigated.

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Morris Plains, NJ, United States of America

Robert Atmaram Soni