Ntt Docomo, Inc.

Docomo, Inc.

Haralabos Papadopoulos

Sean Anthony Ramprashad

Giuseppe Caire

Carl-Erik W Sundberg

Ozgun Bursalioglu Yilmaz

Chenwei Wang

Ansuman Adhikary

Hooman Shirani-Mehr

Yuichi Kakishima

Qiaoyang Ye

Andreas F Molisch

Le Liu

Ulas C Kozat

Ming-Yang Chen

Christine Pepin

Ozgun Bursalioglu

Xiaojun Tang

Ozgun Bursalioglu-Yilmaz

Dilip Bethanabhotla

Zheda Li

Christine Pépin

Methods and apparatuses for data-driven uplink power control in a wireless network are described. In some embodiments, a network entity in a communication system supporting the uplink power control by the design of target signal-to-interference-plus-noise-ratio (TSIR) patterns for one or more cells in the target area, where the network entity comprises: a transceiver to receive reported traffic data from one or more cells in the target area; and a TSIR generation engine having one or more processors configured to automatically generate the one or more signal-to-interference-plus-noise-ratio (TSIR) patterns for the one or more cells of the target area in response to one or more trigger conditions, wherein the transceiver component is operable to transmit at least one of the one or more TSIR patterns to one or more cells in the target area.

Data-driven uplink power control in a wireless network

A method and apparatus is disclosed herein for scheduling, load balancing and/or pilot assignment in MIMD cellular deployments (e.g., reciprority-based MIMO cellular deployments). In one embodiment, the method comprises receiving, by the central controller from at least one AP, for at least one user terminal, a size of a user set and user rate information indicative of a rate that can be provided to the user terminal when served in a group of one or more user terminals; and determining, by the central controller, based on user rate information and the user set size, an allocation of AP resources among the user terminals for the at least one AP.

Method and apparatus for scheduling, load balancing, and pilot-assignments in reciprocity-based MIMO cellular deployments

A method and apparatus is disclosed herein for wireless transceiver calibration. In one embodiment, the method for relative calibration of multiple transceiver units for their use for joint transmission from groups of transceiver units to at least one other wireless entity, wherein each transceiver unit includes an antenna element, comprises: exchanging pilots using multiple signaling resource slots, using at least two non-overlapping groups of transceiver units; and performing calibration of transceiver units in the first and second groups of transceiver units, including choosing relative calibration parameters to control calibration and using a metric to assess calibration, where the metric is based on at least one combination of calibration parameters and the observations of each transceiver group in at least two groups of transceiver units based the simultaneous pilot broadcast and subsequent reception between transceiver units in pairs of groups of transceiver units.

Transceiver calibration for large-scale and massive MIMO deployments

A method and apparatus is disclosed herein for base station selection based on uplink pilot and distributed user-proximity detection. In one embodiment, the method comprises performing uplink pilot configuration for a plurality of user terminals over a set of common resource elements, including generating a plurality of pilot patterns for the plurality of user terminals, where each of the plurality of pilot patterns comprises at least one zero-power resource element and at least one non-zero-power resource element and at least one zero-power resource element allocated to each different one of the plurality of user terminals has a different position in the pilot pattern.

Mechanism and procedure of base station selection based on uplink pilot and distributed user-proximity detection

A method and apparatus for data transmission in a cellular system are disclosed herein In one embodiment, the method comprises receiving transmissions of uplink pilot signals made in each slot, by a number of UEs, over the radio resource elements in slots that are allocated for uplink pilot transmission, wherein the number of UEs in the vicinity of at least one base station exceeds the number of radio resource elements that have been allocated for uplink pilot transmission in the slot; estimating large-scale radio-channel propagation strengths of a plurality of nearby UEs to a base station; estimating radio-propagation channel coefficients between each base-station antenna and each UE, in a subset of UEs in the plurality of nearby UEs that have large-scale radio-channel propagation strengths to the base station that are stronger than those UEs in the plurality of nearby UEs not part of the subset; and transmitting to in-cell UEs via multi-user beamforming, including suppressing interference to one or more nearby out-of-cell UEs that are part of the plurality of nearby UEs.

Method and apparatus for extracting large-scale features in propagation channels via non-orthogonal pilot signal designs

A method and apparatus is disclosed herein for uplink pilot reuse and user-proximity detection in wireless networks. In one embodiment, a wireless system is disclosed for use in a wireless network having a plurality of user terminals (UTs), where at least two UTs of the plurality of UTs have pre-assigned user uplink pilot codes and are allocated common pilot resources over at least two concurrent slots, the system comprising a UT-proximity detection processor to determine which UT channels the UT-proximity detection processor can resolve among a group of UTs transmitting pilots in identical pilot resources, the UT-proximity detection processor operable to resolve a UT channel of a UT by determining the UT is in proximity of the system and no other UT in the group of UTs transmitting pilots that has transmitted a pilot on the identical pilot resources is in proximity of the system.

Uplink pilot reuse and user-proximity detection in wireless networks

A method and apparatus are disclosed herein for user/base station signaling and load balancing across a wireless network. In one embodiment, the method comprises broadcasting, by a first base station in the wireless network, information indicative of the load of the first base station; receiving an association request from the user terminal for association with the first base station in response to the user terminal predicting a net throughput from the first base station, based on the information indicative of the load, being greater than net throughput from a second base station to which the user terminal is currently associated; and determining whether to accept the association request while performing an association process for selectively allowing only a fraction of requests from user terminals to associated with the base station.

Method and apparatus for user/base-station signaling and association achieving load balancing across wireless multi-band heterogeneous networks

A method and apparatus is disclosed herein for resource allocation in a wireless communication system are disclosed. In one embodiment, the method comprises allocating portions of the resources available to a subset of base stations of the plurality of base stations to serve a subset of UTs from clusters of base stations with cluster sizes including at least one with two or more base stations, where each of the portions of resources are allocated to serve one UT via a user-dependent cluster of base stations; and scheduling UT transmissions over the subset of base stations and scheduling slots, wherein within each of the scheduling slots one or more user terminals are scheduled for transmission, each by its user-dependent cluster of base stations.

Method and apparatus for resource allocation and for scheduling cellular and coordinated multipoint transmissions in heterogeneous wireless networks

A method and apparatus is disclosed herein for channel state information dissemination for multi-user (MU) multiple-input multiple-output (MIMO) (MU-MIMO) transmission schemes based on outdated channel state information. In one embodiment, a method for disseminating channel state information (CSI) coefficients from a first user terminal, where each CSI coefficient corresponds to the CSI previously observed by the first user terminal during transmission resource blocks used by a base station to communicate information to a second set comprising at least one user terminal and not including the first user terminal, comprises: broadcasting by the base station the channel state information (CSI) of each user terminal in the second set of user terminals, on the subset of transmission resources used by the base station to communicate information to each user terminal in the second set; receiving observations of these transmissions by the first user terminal; performing, at first user terminal, eavesdropper channel selection of a subset of CSI coefficients between the base station and the eavesdropping first-user terminal for uplink CSI feedback, the subset chosen out of the set of CSI coefficients between base station and the first user-terminal on the transmission resources used by the base station to communicate information to each user terminal in the second set; scheduling the subset of the selected CSI coefficients for uplink transmission; and transmitting the subset of the selected CSI coefficients via the uplink transmission.

Method and apparatus for efficient channel state information dissemination for MU-MIMO transmission schemes based on outdated channel state information

A method and apparatus is disclosed herein for internal relative transceiver calibration. In one embodiment, the method comprises generating a plurality of processed observations corresponding to pilots transmitted by transceiver units in the entity and observations of the pilots by transceiver units in the entity, each processed observation being indicative of a combined response of a pilot transmitted by transmitter hardware of one transceiver unit at the entity and an observation of the pilot by receiver hardware of another transceiver unit at the entity; grouping the plurality of processed observations into one or more observation pairs, where each observation pair of the one or more observation pairs comprises: a first observation indicative of a combined response between transmitter hardware of a first transceiver unit and receiver hardware of a second transceiver unit in the entity, and a second observation indicative of a combined response between transmitter hardware of the second transceiver unit and receiver hardware of the first transceiver unit in the entity; and calculating, based on at least one of observation pairs, relative calibration values, where each relative calibration value is associated with a transceiver of each transceiver unit and is relative with respect to a transceiver of a reference unit at the entity.

Method and apparatus for internal relative transceiver calibration

A method and apparatus for load balancing in a wireless network is described. In one embodiment, the method comprises receiving, by at least one of the one or more controllers, from at least one of the one or more base stations, information indicative of a rate that can be provided by the at least one base station to at least one client terminal by the at least one base station when serving a group of one or more client terminals, the at least one client terminal being associated to the at least one controller; receiving, by the at least one of the one or more controllers, from the at least one of the one or more base stations, information indicative of the transmission resources provided by the at least one base station for resource allocation among the at least one client terminal by the at least one controller; and determining, by the at least one controller, based on the information indicative of the rate and the information indicative of transmission resources, information indicative of an allocation of base station transmission resources for at least one client terminal from the at least one base station.

Method and apparatus for scalable load balancing across wireless heterogeneous MIMO networks

A method and apparatus is disclosed herein for relative calibration of transceivers in a wireless communication system. In one embodiment, the method comprises transmitting multiple pilots from units in the first group; receiving, in response to the multiple pilots, a first set of pilot observations at each unit in the second group; transmitting a single pilot simultaneously from at least two units in the second group; in response to the single pilot, receiving a second set of pilot observations at each unit in the first group; and using the first and second sets of pilot observations to calibrate each of at least two units in the second group based on a reference array of transceivers in the first group of transceivers.

Method and apparatus for relative transceiver calibration for wireless communication systems

A method and apparatus is disclosed herein for transmitting information in massive MIMO system. In one embodiment, the apparatus comprises a plurality of antenna elements; a baseband processor; a plurality of radio-frequency (RF) chains coupled to the baseband processor; a plurality of switches coupled to the plurality of RF chains, wherein positions of switches in the plurality of switches being determined by instantaneous channel state information; a radio-frequency (RF) preprocessor coupled between the plurality of switches and the plurality of antenna elements, the RF preprocessor to apply a preprocessing matrix to signals, elements of the preprocessing matrix being adjusted as a function of average channel state information, and wherein the positions of the switches and elements of the preprocessing matrix are jointly chosen, and wherein the preprocessing matrix is chosen based on a metric related to expected performance obtained from at least one channel realization.

Growing community of inventors

San Jose, CA, United States of America

Haralabos Papadopoulos