Telefonaktiebolaget Lm Ericsson (publ)

Other

Leif Wilhelmsson

Miguel Lopez

Bengt Lindoff

Dennis Sundman

Thomas Nilsson

Lars Sundström

Guido Roland Hiertz

Anders Wallén

Henrik Sjöland

Filip Mestanov

Thomas Olsson

Rocco Di Taranto

Dzevdan Kapetanovic

Anders Wallen

Naveed Butt

Stefan Parkvall

Joakim Persson

Jim Svensson

Athanasios Stavridis

Gabor Fodor

Sven Erik Mattisson

Erik Bengt Dahlman

Yu Wang

Robert Baldemair

Johan Rune

Yi-Pin Eric Wang

Erik A Eriksson

Joachim Sachs

Bo Hagerman

Fenghao Mu

Meng Wang

Yngve Selen

Jung-Fu Cheng

Joakim Axmon

Johan Nilsson

Imadur Rahman

Per Skillermark

Fredrik Nordström

Roland A Smith

Oscar Zee

Bo Magnus Bernhardsson

Göran N Klang

Joao Vieira

Pontus Arvidson

Parth Amin

Hakan Persson

Charlie Pettersson

Stefano Sorrentino

Stefan Wager

Qianxi Lu

Qingyu Miao

David Astely

Jacobus Cornelis Haartsen

Ali S Khayrallah

Erik G Larsson

Marco Belleschi

Niklas Andgart

David Hammarwall

Christian Hoymann

Chester Park

Tai Do

Emil Björnson

Johan Söder

Luis Felipe Del Carpio Vega

Michael Samuel Bebawy

Lars Sundstrom

Magnus L Olsson

Piergiuseppe Di Marco

Fredrik Nordstrom

Anders Berkeman

Fredrik Gunnarsson

Havish Koorapaty

Andres Reial

Henning Wiemann

Gregory Edward Bottomley

Konstantinos Dimou

Kumar Balachandran

Michael Meyer

Peter Alriksson

Andreas Bergström

Christian Bergljung

Christofer Lindheimer

Sina Maleki

Magnus Nilsson

Yngve Selén

Thomas Rimhagen

Anders Furuskar

Johan Sköld

Vicknesan Ayadurai

Roland Strandberg

Peter Malm

Hongwei Wang

Lennart Andersson

Jan Celander

Nafiseh Shariati

Michael Faulkner

Michal Stala

Narendar Madhavan

Robert Hed

A method is disclosed of a transmitter configured to transmit a physical layer packet in accordance with a listen-before-talk procedure. The method includes acquiring an indication of a specific time for channel estimation, providing the physical layer packet with at least one measurement signal for channel estimation based on the specific time, and transmitting the physical layer packet. In some embodiments, the physical layer packet is provided with a plurality of midambles, wherein each midamble includes one or more measurement signals for channel estimation. In some embodiments, the physical layer packet is provided with a floating midamble which comprises one or more measurement signals for channel estimation. A method is also disclosed of a receiver configured to receive a physical layer packet transmitted in accordance with a listen-before-talk procedure.

Measurement signal for channel estimation

A packet format is disclosed for transmission of data packets over a communication channel, wherein transmission of one of the data packets utilizes a frequency bandwidth, and wherein the frequency bandwidth is dynamically variable between data packets. The packet format defines a frequency bandwidth detection field, wherein the frequency bandwidth detection field of a data packet has a first field content or a second field content, and wherein corresponding parts of the first and second field contents are orthogonal to each other. The first field content is indicative of that transmission of the data packet utilizes a first frequency bandwidth and the second field content is indicative of that transmission of the data packet utilizes a frequency bandwidth which is larger than the first frequency bandwidth. Corresponding methods and apparatuses for transmission/reception of data packets are also disclosed.

Packet format for transmission of data packets

A method for a wake-up transmitter comprises generating a wakeup signal (WUS) from a digital WUS sequence having an information symbol rate and a corresponding information symbol bandwidth, and transmitting the WUS over a frequency range having a signal bandwidth, wherein the signal bandwidth is larger than twice the information symbol rate, and wherein any frequency interval comprised in the frequency range conveys the digital WUS sequence when a width of the frequency interval is at least the information symbol bandwidth. A corresponding method for a wake-up receiver comprises receiving the WUS over the frequency range, and filtering the received WUS through a filter having a filter bandwidth for passing the information symbol bandwidth of the received WUS. Corresponding apparatuses, wake-up transmitter, wake-up receiver, communication device and computer program product are also disclosed.

Wake-up signal, and corresponding transmitter and receiver

A method is disclosed of a transmitter configured to transmit a physical layer packet having a plurality of midambles. The method comprises applying a respective phase shift for each midamble of the physical layer packet, and transmitting the physical layer packet. The respective phase shift is applied to at least a portion of symbols of the midamble. A method is also disclosed of a receiver configured to receive a physical layer packet having a plurality of midambles. The method comprises receiving the physical layer packet, and counteracting a respective phase shift for each midamble of the physical layer packet. Counteracting the respective phase shift comprises applying an opposite of the respective phase shift to at least a portion of symbols of the midamble or compensating the respective phase shift for at least a portion of symbols of the midamble.

Transmission and reception of a physical layer packet with midambles

An access point of a wireless communication system configures a carrier for communication with one or more wireless devices associated with the access point. Based on a backoff counter maintained by the access point, the access point contends for access to the carrier to transmit data. In response to another access point winning contention for access to the carrier, the access point cooperates at least with the access point winning the contention by sharing a transmission opportunity reserved on the carriers by the access point winning the contention and transmitting at least a part of the data in the shared transmission opportunity. During the shared transmission opportunity the access point pauses the backoff counter.

Backoff counter handling for TXOP sharing

A wireless communication node () and method therein for generating and transmitting a modulated radio frequency (RF) signal by means of backscattering are disclosed. The wireless communication node () comprises an antenna () configured to receive a illuminating RF signal, a switch () that has M states, a set of impedances () comprising Mimpedances (Z1, Z2 . . . ZM). The antenna () is coupled to the set of impedances () by the switch (). The wireless communication node () further comprises a modulating value generator () configured to generate modulating values based on data to be transmitted and a frequency offset and a switch controller () configured to switch the state of the switch () based on the generated modulating values such that the antenna () is connected to a selected impedance among the M impedances. The received illuminating RF signal at the antenna () is modulated by the generated modulating values and reflected by the antenna () to generate and transmit the modulated RF signal. The switching rate is an integer multiple of the data rate, the integer is greater than 1 and the center frequency of the modulated RF signal has the frequency offset with respect to the center frequency of the received illuminating RF signal.

Communication node and method for generating modulated signals by backscattering

A method is disclosed of a transmitter configured to transmit a physical layer packet comprising a plurality of measurement signals for channel estimation. The method includes configuring the transmitter to use different precoding settings for at least two of the plurality of measurement signals for channel estimation, and transmitting the physical layer packet. In some embodiments, at least one of the plurality of measurement signals for channel estimation occurs outside of a preamble of the physical layer packet (e.g., in a midamble). A method of a corresponding receiver is also disclosed. Corresponding apparatuses, wireless communication device, and computer program product are also disclosed.

Measurement signals for sensing

An access point () of a wireless communication system configures a carrier for communication with one or more wireless devices () associated with the access point (). Further, the access point () contends for access to the carrier and, in response to winning contention for access to the carrier, reserves a transmission opportunity, TXOP, on the carrier. Further, the access point () cooperates with one or more other access points () of the wireless communication system by sharing the TXOP based on spatial multiplexing of wireless transmissions on the carrier.

Sharing of TXOP based on spatial multiplexing

Methods are disclosed for communication devices capable of simultaneous transmission and reception, wherein a first method is for reception of a packet comprising a header and a payload and a second method is for transmission of a packet comprising a header and a payload. The second method comprises transmitting at least a part of the header. The first method comprises receiving at least a part of the header, attempting to decode the part of the header, and (when the part of the header is successfully decoded) transmitting a header acknowledgement signal. The second method comprises monitoring receipt of a header acknowledgement signal, and (when absence of the header acknowledgement signal is detected) interrupting the transmission of the packet and scheduling the packet for retransmission. Corresponding apparatuses, transceivers, communication devices and computer program products are also disclosed.

Acknowledgement for simultaneous transmission and reception

A method performed in a base station for frequency calibration of a receiver is disclosed. The base station generates a first signal with periodic ASK modulation and transmits the first signal as a preamble or frequency marker signal to facilitate frequency calibration of the receiver. The receiver sweeps its oscillator frequency to detect if there is a preamble or frequency marker signal present. When it is determined that there is a signal present, the oscillator frequency of the receiver is calibrated to the transmitting frequency of the base station. The base station then transmits a second signal as a wakeup signal to the receiver.

Preamble signal for wakeup communication in a wireless communication system

A position of a wireless device () is determined based on an optical communication signal transmitted between the wireless device () and one or more access points () of the wireless communication network. The determined position is used for controlling beamforming processing of radio communication signals transmitted between the wireless device () and one or more second access points () of the wireless communication network.

Light-communication based control of radio transmissions

Methods, apparatus and non-transitory machine-readable mediums are provided for wireless access in communications networks comprising radio access network nodes and wireless light communication network nodes. In one embodiment, a method is performed by a radio access network node for selecting a transmit or receive beam for communication with a wireless device in a communication network. The radio access network node comprises a plurality of antenna elements configurable to provide a plurality of transmit or receive beams. The communication network further comprises one or more wireless light communication, LC, network nodes. The method comprises: obtaining information identifying a wireless LC network node to which the wireless device is connected; based on the identified wireless LC network node, selecting a subset of the plurality of transmit or receive beams; and initiating a beam-sweeping procedure using the subset of transmit or receive beams to select a transmit or receive beam for communication with the wireless device.

Methods, apparatus and machine-readable mediums related to wireless access in communication networks

A wireless communication device () comprises a first transceiver () comprising a first frequency synthesizer () which comprises a first digitally controlled oscillator (DCO) and a crystal oscillator (XO). The wireless communication device () further comprises a second transceiver () comprising a wakeup receiver (Rx), a second transmitter (Tx) and a second digitally controlled oscillator (DCO) connected to the wakeup receiver (Rx) and second transmitter (Tx). The wireless communication device () further comprises a control unit () configured to control operation of the wireless communication device. The second transmitter (Tx) is configured to transmit periodically a signal to a base station. The signal is modulated by a code identifying the wireless communication device () and transmitted at a frequency set by the second digitally controlled oscillator (DCO).

Wakeup communication in a wireless communication system

A method is disclosed for transferring data symbols between a transmitter and a receiver. The method comprises specifying communication symbols through application of a transform to a representation of the data symbols, and conveying a signal indicative of the communication symbols from the transmitter to the receiver. When expressed as a transform matrix, the transform has at least the following properties: that a ratio (between number of zero-valued elements of the transform matrix and number of non-zero-valued elements of the transform matrix) equals or exceeds a sparsity threshold, and that a number of columns of the transform matrix that has a zero-valued element sum equals or exceeds an angle distortion mitigation threshold. When the method is performed by the transmitter, the method may further comprise providing the communication symbols by applying the transform to amplitude representations of the data symbols, and conveying the signal indicative of the communication symbols may comprise transmitting the signal. When the method is performed by the receiver, conveying the signal indicative of the communication symbols may comprise receiving the signal, and the method may further comprise estimating the data symbols by applying a reverse operation of the transform to angle representations of the received signal. Corresponding apparatuses, transmitter, receiver, communication device and computer program product are also disclosed.

Transform for communication symbols

A technique for performing a multi-layer transmission from a transmitting station to a receiving station on a radio frequency is described. The multi-layer transmission comprises multiple layers () having different robustnesses on the radio frequency. As to a method aspect of the technique, a first portion () of first data () and a first portion () of second data () on a first layer () of the multi-layer transmission and, simultaneously on a second layer () of the multi-layer transmission, a second portion () of the first data () and a second portion () of the second data () are transmitted.

Multi-layer transmission technique

Growing community of inventors

Dalby, Sweden

Leif Wilhelmsson