Alcatel Lucent

Alcatel-lucent USA Inc.

Nokia Solutions and Networks Oy

Lucent Technologies Inc.

Nokia Siemens Networks Oy

Google Technology Holdings LLC

Shirish Nagaraj

Harish Viswanathan

Suman Das

Subramanian Vasudevan

Pantelis Monogioudis

Jung Ah Lee

Phil Fleming

Raghavendra M Ramakrishna

Hongwei Kong

Ashok N Rudrapatna

Shupeng Li

Yuda Yehuda Luz

Francis Dominique

Anil M Rao

Alan P Rottinghaus

Xiaoyong Yu

Roy Yang

Walid Elias Nabhane

Sivarama Venkatesan

Sudhir Ramakrishna

Michael Honig

David Baietto

Olli Piirainen

Suresh Kalyanasundaram

Jialin Zou

Rajeev Agrawal

Phillip D Rasky

Gerald J Gutowski

Philip J Fleming

Sridhar Gollamudi

Khalid Zeineddine

Christopher Robert Schmidt

Kashyap Kamdar

Yehuda Luz

Mark Allen Schamberger

Deepak Pengoria

Ke-Kang Chin

Scott R Clapp

Pradap Konda

Deepak Das

Pradap Venkatramanan Konda

Francis Doninique

A method and apparatus are disclosed for determining a signal subspace in a communications system. A remote apparatus obtains signal streams from antenna elements or signal streams from antenna beams. Based on the obtained signal streams, the apparatus selects a signal subspace for a user, the signal subspace having a dimension M. Based on the selected signal subspace, the apparatus transmits, via an interface to a central apparatus, M streams of post-fast-Fourier-transform data, the interface being capable of transmitting a different subspace for different frequency bins.

Distributed base station with frequency domain interface on which signal subspace varies according to frequency bin

Systems and techniques for managing helper cells in coordinated multipoint processing. Bandwidth assistance is requested from one or more cells operating in a network. In response to demand price and headroom information provided by a plurality of cells receiving the request, a set of potential helper cells is rank ordered and identified one or more helpers is identified from the ordered set and a candidate helper set is assembled based on bandwidth performance assistance criteria. A new request for bandwidth assistance is made. In response to new demand price and headroom information obtained from the candidate helper set, a determination is made whether sufficient iterations have been performed. If sufficient iterations have not been performed, the process is repeated, and if sufficient iterations have been performed, a requesting cell proceeds to operate while receiving bandwidth assistance from the assembled set.

Methods and apparatus for coordinated multipoint communication

The embodiments of the invention provide at least a method and apparatus to schedule an uplink communication from a user equipment of a plurality of user equipment; identify one or more candidate cells to support the uplink communication from the user equipment; send a request to the identified one or more candidate cells for requesting at least one of antenna data and pilot symbols from the one or more candidate cells for the uplink communication from the user equipment; and in response to the request, receive the uplink communication from the user equipment via a coordinated multi-point operation using at least in part a reception cells of the one or more candidate cells. Further, to receive, by one or more candidate cell, from a serving cell a request for at least one of antenna data and pilot symbols from the one or more candidate cells for a scheduled uplink communication from a user equipment to the serving cell; and in response to the request, provide the at least one of antenna data and pilot symbols for the uplink communication from a user equipment to the serving cell.

Management of coordinated multi-point communication

Successfully decoded data received from a mobile terminal as well as the transmission format of that data is relayed over the backhaul from a base station receiver that successfully decoded the mobile terminal's transmission to the base stations in the mobile terminal's active set that presumably were unable to decode the mobile terminal's transmission due to inadequate signal-to-noise ratio. A base station that receives this transmission from the relaying base station that did successfully decode and demodulate the mobile terminal's transmission is then able to reconstruct the data and subtract it from the total interference, thereby increasing the signal-to-noise ratio at this base station for its in-cell processing.

Method to control the effects of out-of-cell interference in a wireless cellular system using backhaul transmission of decoded data and formats

A method includes, for a selected user equipment for signals corresponding in part to the selected user equipment and received by antennas from a number of cells, wherein each cell has one or more antennas, and wherein each signal is from an individual one of the antennas, performing the following: estimating carrier frequency offset for each cell using one or more of the signals from the cell; performing frequency offset correction on each signal from each cell by using at least the estimated carrier frequency offset for an associated cell; estimating a channel for each frequency offset corrected signal; and combining, using the estimated channels, each of the frequency offset corrected signals to generate one or more estimates of one or more symbols transmitted from the selected user equipment. A second frequency offset correction may be performed subsequent to the combining. Apparatus, computer programs, and software are also disclosed.

Frequency error correction for LTE uplink CoMP

A first cell determines that UE(s) should have HARQ cycle(s) skipped, where each of the UE(s) is to take part in a CoMP transmission. Skipping is to be performed to enable the first cell to receive information from second cell(s) over backhaul link(s) for the HARQ transmission(s). A first HARQ cycle is scheduled and participated in for the UE(s) in order to receive a transmission at the first cell from the UE(s). The HARQ cycle(s) is/are skipped for the UE(s) by sending, prior to decoding information from the uplink CoMP transmissions, an acknowledgement to the UE(s) and not scheduling the UE(s) for a PDCCH grant for the HARQ cycle(s). The skipping depends on one or more of: a backhaul latency, a load in the first cell, a type of UE, or a request to the second cell(s). Apparatus and program products are also disclosed.

Cooperative uplink reception suitable for non-ideal backhaul

Methods of reverse link power control are provided. A first example method includes first adjusting OFDMA transmission power based on first feedback signals during an OFDMA transmission and second adjusting OFDMA transmission power based on second feedback signals during periods between OFDMA transmissions. A second example method includes sending first power adjustment indicators based on measured OFDMA SINRs when receiving OFDMA transmissions from a mobile station and sending second power adjustment indicators based on estimated OFDMA SINRs when not receiving OFDMA transmissions from the mobile station. A third example method includes receiving a plurality of interference indicating signals from different base stations and determining whether to adjust a maximum transmit power threshold based on the plurality of interference indicating signals, the maximum transmit power threshold indicating the maximum permitted transmission power level below which transmissions are constrained.

Methods of reverse link power control

Embodiments of the invention utilize advanced statistical data analytics to predict and provide recommendations for root-cause analysis for service access QoE issues in networks, such as 3G/4G networks. Using FCAPS data as predictor variables, embodiments are configured to set up the problem as a predictive regression or classification problem to estimate service access QoE related indicators. Some embodiments perform training and tuning of various non-linear statistical modelling algorithms, based for example on tree and ensemble methods, using network deregistration information from RAN logs.

Method and system for prediction and root cause recommendations of service access quality of experience issues in communication networks

A method includes selecting a subset k of N accessible antennas to use to process a transmission received at the N antennas and sent by a user equipment, and processing the transmission from the user equipment at least by using baseband information from the k antennas. An apparatus includes one or more processors and one or more memories including computer program code. The one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to perform at least the following: selecting a subset k of N accessible antennas to use to process a transmission received at the N antennas and sent by a user equipment; and processing the transmission from the user equipment at least by using baseband information from the k antennas. Additional apparatus, computer programs, and computer program products are disclosed.

Uplink grouping and aperture apparatus

The specification and drawings present a new method, apparatus and software related product (e.g., a computer readable memory) for a timing offset/error estimate (TOE) method, e.g., for a LTE UL receiver. This may especially beneficial for the MU-MIMO and/or CoMP with MAAS applications, where the conventional methods do not work properly due to a strong interference among users (UEs) sharing the same radio resource. Two approaches (separately or in combination) may be used to improve TOE quality. First, the timing offset/error may be calculated using phase difference for pilot pairs with non-adjacent pilots/carriers having a larger separation between subcarriers than for pilot pairs with adjacent subcarriers. Second, a modified pilot sequence for timing offset estimate may be created using sliding an averaging window. This can effectively remove interference which is critical for the MU-MIMO and CoMP applications.

Timing error estimate of UL synchronization

Methods of reverse link power control are provided. In one example embodiment, a signal-to-interference+noise (SINR) is measured for a plurality of mobile stations. A power control adjustment is determined for each of the mobile stations based on the measured SINR for the mobile station and a fixed target SINR, the fixed target SINR being used in the determining step for each mobile station and sending the power control adjustments to the mobile stations. In another example embodiment, one or more signals are transmitted to a base station. A power control adjustment indicator indicating an adjustment to a transmission power level is received. The received power control adjustment is determined based on a measured signal-to-interference+noise ratio (SINR) for the one or more transmitted signals and a fixed target SINR threshold, the fixed target SINR threshold being used for power control adjustment of a plurality of mobile stations.

A method is disclosed that includes accessing baseband information for a number, N (N&#x3e;1), of antennas accessible by a number of baseband units, where the baseband information correspond to a transmission by a user equipment and is received at the N antennas. The method includes determining values for one or more metrics for the baseband information for the N antennas. The method includes selecting, based on the determined values, a subset k of the N antennas and corresponding baseband information to use to determine output data for the transmission by the user equipment. The method includes determining the output data for the user equipment using the baseband information from the k antennas. Apparatus and computer program products are also disclosed.

Cell clustering and aperture selection

The specification and drawings present a new method, apparatus and software related product for antenna clustering for multi-antenna aperture selection (MAAS), e.g., in LTE wireless systems, using multi-core DSP processing with sub-optimum selection of N out of M of antenna signals and minimizing the performance degradation due to the sub-optimal antenna/antenna signal selection. Assigning each DSP core (machine) to N/K antennas (i.e., to antenna signals) having a similar property (e.g., polarization) and a same tier, the selection of N out of M using a predefined criterion (e.g., best SINR) is reduced to selecting N/K out of M/K which reduces the computation complexity by a factor of K, where K is a number of the DSP cores.

Antenna clustering for multi-antenna aperture selection

Systems and techniques for managing interference between pico cells in a pico cluster. Pico eNodeBs are configured in groups for each of a plurality of UEs, based on factors such as signal to noise ratio and geographic location. All signals from UEs may be measured by all eNodeBs in the cluster, but a pico group decodes packets only of UEs associated with the pico group. Decoded packets are exchanged between pico groups, and when a pico group is unable to decode packets of an associated UE, is uses the decoded packets received in exchanges to reconstruct an interference signal. The interference signal is subtracted from the received signal and the resulting received signal is used to decode the packets of the UE.

Methods and apparatus for interference management

Apparatus, methods, and programs products are disclosed that perform the following techniques: in a receiver comprising first and second stages, each stage at least decoding information corresponding to a user equipment, wherein the second stage performs decoding only if the first stage completes decoding with a fail, predicting whether decoding performed by the second stage for the user equipment will complete with a pass or fail; and prior to completion of the second stage, sending an indication of the predicted pass or fail to the user equipment.

Error prediction for two-stage receivers

Growing community of inventors

Cedar Knolls, NJ, United States of America

Shirish Nagaraj