Nokia Corporation

Broadcom Corporation

Mediatek Singapore Pte. Ltd.

Mediatek Corporation

Nokia Technologies Oy

Nokia Solutions and Networks Oy

Renesas Mobile Corporation

Avago Technologies International Sales Pte. Limited

Avago Technologies General IP (singapore) Pte. Ltd.

Hfi Innovation Inc.

Cellular Communications Equipment LLC

Avago Technologies General IP Pte, Ltd.

Gilles Charbit

Tao Chen

Timo Koskela

Sami-Jukka Hakola

Abdelkader Medles

Haiming Wang

Jing Han

Vinh Van Phan

Erlin Zeng

Wei Bai

Chunyan Gao

Shiang-Jiun Lin

Na Wei

Per Johan Mikael Johansson

Matti Jokimies

Wei Hong

I-Kang Fu

Li-Chuan Tseng

Sami Hakola

Hai Ming Wang

Kari Rikkinen

Bernhard Raaf

Chun-Chia Chen

Tommi Tapani Koivisto

Bao-Chi Peng

Chiao Yao Chuang

Esa Juhani Tuomaala

Shao-Chou Hung

Samuli Heikki Turtinen

Feifei Sun

Olav Tirkkonen

Seppo Ilmari Vesterinen

Mikko J Rinne

Jorma Lilleberg

Mikko Säily

Kaj Tapio Jansen

Joseph R Cavallaro

Chun Yan Gao

Ülo Parts

Jianke Fan

Sathiaseelan Sundaralingam

Chiao-Yao Chuang

Francesc Boixadera-Espax

Yrjö Olavi Kaipainen

Marjan Karkooti

Alberto Escolar-Piedras

Matti Kullervo Jokimies

Kuo Hsun Lee

Shiang Jiun Lin

Kari Juhani Rikkinen

Timo Kalevi Koskela

Olav E Tirkkonen

Yrjö Kaipainen

Solutions pertaining to enhanced support for transmit-receive (Tx-Rx) gap in non-terrestrial network (NTN) communications are proposed. An apparatus implemented in a UE receives from a non-terrestrial (NT) network node of a network an uplink (UL) grant or a configuration that schedules an UL transmission (Tx). The apparatus performs the UL transmission to the NT network node within a transmit-receive (Tx-Rx) transition gap during which no downlink (DL) Tx from the NT network node is expected. The Tx-Rx transition gap includes an UL Tx duration, a pre-UL Tx gap (Gap_start) before a starting time of the UL Tx duration (t_start), and a post-UL Tx gap (Gap_end) after an ending time of the UL Tx duration (t_end). A starting timing of the Tx-Rx transition gap can be expressed as: t_start−timing advance (TA)−Gap_start. An ending time of the Tx-Rx transition gap can be expressed as: t_end−TA+Gap_end.

Enhanced support for transmit-receive transition gap in non-terrestrial network communications

Provided is an apparatus for transmitting a circularly polarized signal by linearly polarized antennas. A horizontally polarized antenna and a vertically polarized antenna of the apparatus receives a first circularly polarized signal transmitted based on a transmitted baseband signal vector. Based on the first circularly polarized signal, a radio frequency (RF) module of the apparatus generates a received baseband signal vector including a product of the transmitted baseband signal vector and a receiving polarization vector of the transmitted baseband signal vector. Processing circuitry of the apparatus estimates the receiving polarization vector based on the received baseband signal vector and calibrates power amplifiers (PAs) and local oscillator (LO) signals of frequency converters in the RF module based on the estimated receiving polarization vector. The horizontally and vertically polarized antennas transmit a second circularly polarized signal based on the calibrated PAs and the calibrated LO signals of the frequency converters.

Transmitting or receiving circularly polarized signals by linearly polarized antennas

Aspects of the disclosure provide an apparatus for receiving a circularly polarized signal by linearly polarized antennas. A horizontally polarized antenna and a vertically polarized antenna of the apparatus receive a circularly polarized signal that is transmitted based on a transmitted baseband signal vector. A radio frequency (RF) module of the apparatus generates a first baseband signal vector based on the received circularly polarized signal. The first baseband signal vector includes a product of the transmitted baseband signal vector and a receiving polarization vector of the transmitted baseband signal vector. Processing circuitry of the apparatus estimates the receiving polarization vector of the transmitted baseband signal vector based on the first baseband signal vector. The processing circuitry derives a second baseband signal vector based on the estimated receiving polarization vector and the first baseband signal vector.

Various solutions for physical random access channel (PRACH) timing advance operation and PRACH configurations with respect to user equipment and network apparatus are described. An apparatus may determine a propagation delay between the apparatus and a network node. The apparatus may determine a pre-compensation timing margin. The apparatus may perform a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin. The apparatus may transmit an uplink signal by applying the timing advance pre-compensation.

Method and apparatus of physical random access channel timing advance operation in non-terrestrial network communications

Various solutions for synchronization in non-terrestrial network (NTN) communications are proposed. An apparatus implemented in a user equipment (UE) obtains at least one of a downlink (DL) pre-compensated frequency value applied on a service link from a satellite of a non-terrestrial network (NTN) and a feeder link delay drift rate of a feeder link between a network node and the satellite. The apparatus further obtains a Doppler frequency shift value. Then, the apparatus performs a timing compensation through adjusting a sampling rate according to at least one of the DL pre-compensated frequency value, the feeder link delay drift rate, and the Doppler frequency shift value.

Delay drift rate compensation in non-terrestrial network communications

Various solutions for slot aggregation design in non-terrestrial network (NTN) communications with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a demodulation reference signal (DMRS) time bundling configuration. The apparatus may determine a duration interval of the DMRS time bundling configuration. The apparatus may perform channel estimation cross slots based on the duration interval.

Method and apparatus for slot aggregation design in non-terrestrial network communications

Various solutions for random access channel (RACH) preamble design in non-terrestrial network (NTN) communications with respect to user equipment and network apparatus are described. An apparatus may initiate a RACH procedure. The apparatus may determine a fractional frequency offset pattern or a cover code across groups of preamble sequences. The apparatus may generate a RACH preamble signal according to at least one of the fractional frequency offset pattern and the cover code. The apparatus may transmit the RACH preamble signal to a network node.

Method and apparatus for random access channel preamble design in non-terrestrial network communications

Various examples and schemes pertaining to uplink (UL) transmission timing for non-terrestrial networking (NTN) are described. An apparatus receives, from a network, downlink control information (DCI) indicating an NTN offset for a scheduling delay. Accordingly, the apparatus performs one or more UL transmissions to a satellite with the scheduling delay which accounts for the NTN offset.

Uplink transmission timing for non-terrestrial networks

Various solutions for timing advance (TA) reporting by a user equipment (UE) in non-terrestrial network (NTN) communications are described. An apparatus (e.g., a UE), capable of auto-compensation of time delays in signaling, establishes a wireless connection with a network node of a wireless network. The apparatus then transmits a TA report to the network node. Based on the TA, the network can configure a UE-specific offset for UL scheduling.

User equipment timing advance reporting in non-terrestrial network communications

Various examples and schemes pertaining to narrowband reference signal (NRS) transmission on non-anchor carriers in narrowband IoT (NB-IoT) are described. A wireless network indicates a subset of one or more paging groups of user equipment (UEs) among a plurality of UEs in an NB-IoT cell. The wireless network then transmits one or more narrowband reference signals (NRSs) in one or more paging frames or one or more paging occasions associated with the subset of one or more paging groups.

Narrowband reference signal transmission on non-anchor carriers in NB-IoT

Various examples and schemes pertaining to timing advance validation for transmission in preconfigured uplink resources in narrowband Internet of Things (NB-IoT) are described. When in a first mode, an apparatus (e.g., a user equipment) receives a plurality of different values for a time alignment timer (TAT) from a network before entering a second mode from the first mode. When in the second mode, the apparatus selects one of the plurality of values to apply to the TAT and also starts the TAT to count. When there is data for uplink transmission while the apparatus is still in the second mode, the apparatus performs an early data transmission in an event that a timing advance (TA) value is valid and that the apparatus is in the same serving cell as it was before entering the second mode.

Timing advance validation for transmission in preconfigured uplink resources in NB-IoT

Various examples and schemes pertaining to NB-IoT physical random access channel (PRACH) resource partitioning and multiple grants in random access response (RAR) for early data transmission (EDT are described. A network node schedules multiple grants for EDT during a random access (RA) procedure with a user equipment (UE). The network node transmits to the UE a message indicating the multiple grants mapped to a maximum broadcast transport block size (TBS) configured for each of one or more preamble resource of a plurality of preamble resources. The UE calculates a TBS that fits an uplink (UL) data packet of the UE. The UE selects one or more PRACH resources for EDT for the TBS based on a wireless communication coverage of the UE by the network node. The UE transmits to the network node in the RA procedure a first message (Msg1) indicating the selected one or more PRACH resources.

NB-IoT PRACH resource partitioning and multiple grants in RAR for EDT

A method of high reliability and early data transmission (EDT) is proposed. EDT allows one uplink transmission (optionally) followed by one downlink data transmission during a random-access channel (RACH) procedure, which can reduce the signaling overhead and save UE power. To improve reliability, for uplink EDT, there would be different set of RACH reattempt parameters in the UE for different types of access. For downlink EDT, there would be an indication in the paging message to trigger whether the UE would use legacy RACH or not. Further, the configuration for PRACH resource for EDT can be independent to legacy PRACH resource configuration. Under certain conditions, UE can fallback to legacy RACH procedure for high reliability.

High reliability and early data transmission

Growing community of inventors

Farnborough, United Kingdom

Gilles Charbit