Mediatek Singapore Pte. Ltd.

Mediatek Corporation

Mehmet Kunt

Pradeep Jose

Pavan Santhana Krishna Nuggehalli

Abhishek Roy

Chia-Chun Hsu

Abdelkader Medles

A method includes receiving a measurement configuration from a serving cell of a user equipment (UE) in a non-terrestrial network (NTN) providing mobile communication service based on satellites. The satellites can be low Earth orbiting (LEO) satellites, geostationary Earth orbiting (GEO) satellites, and the like. The measurement configuration indicates a first synchronization signal block (SSB) based measurement timing configuration (SMTC) and a second SMTC. The first SMTC specifies first SMTC windows aligning with SSB signals from the serving cell of the UE. The second SMTC specifies second SMTC windows aligning with SSB signals from a first neighbor cell of the UE. The serving cell is associated with a first flying object, and the first neighbor cell is associated with a second flying object. The UE performs a measurement based on the first SMTC corresponding to the serving cell and the second SMTC corresponding to the first neighbor cell.

Measurement configuration in non-terrestrial network (NTN)

Low Earth Orbit (LEO) satellites orbit around the earth at a high speed (mobility), but over a predictable or deterministic orbit. In this invention, an efficient mechanism to include a list of multiple Tracking Area Codes (TAC List) in LEO-NTN is proposed for efficient tracking area update (TAU). Each cell broadcasts a TAC list corresponding to all the tracking areas it covers as it moves, dynamically. A UE selects a cell and is registered with a TA during initial registration and cell selection. As the satellite moves, the UE reselects another cell during cell reselection. The UE triggers a TAU only if its current TA does not match with any tracking area code of the TAC List broadcasted by the reselected cell. By using the concept of TAC list, it significantly reduces the TAU signaling overhead in LEO-NTN.

Efficient tracking area update in LEO-NTN

Various solutions for autonomous retransmission on configured grant with respect to user equipment and network apparatus in mobile communications are described. An apparatus may start a first timer and a second timer when a transmission is performed on a hybrid automatic repeat request (HARQ) process configured for a configured grant. The apparatus may perform an autonomous retransmission using the configured grant when the second timer is expired. The apparatus may cancel restart of the first timer when the autonomous retransmission is performed. The apparatus may restart the second timer when the autonomous retransmission is performed. The apparatus may stop the second timer when the first timer expires. The apparatus may stop the second timer at the activation of a type 2 configured grant.

Method and apparatus for autonomous retransmissions on configured grants in mobile communications

Various schemes pertaining to conditions on LBT impact on MAC counters in mobile communications involve a user equipment (UE) determining a status of a listen-before-talk (LBT) failure detection and recovery feature. Based on the status of the LBT failure detection and recovery feature (e.g., whether the LBT failure detection and recovery feature is configured or not configured), a preamble transmission counter in a random access (RA) procedure or a scheduling request (SR) counter in a SR procedure is conditionally incremented in the event of an LBT failure.

Conditions on listen-before-talk impact on mac counters in mobile communications

Various examples and schemes pertaining to multiplexing, addressing and HARQ for MsgB in two-step RACH in mobile communications are described. An apparatus implemented in a user equipment (UE) transmits to a network node of a wireless network a first message containing a preamble index and data. In response, the apparatus receives from the network node a second message containing a random access response (RAR) and contention resolution information. The second message is addressed to either a cell radio network temporary identifier (C-RNTI) of the UE or a random access radio network temporary identifier (RA-RNTI).

Multiplexing, addressing and HARQ for MsgB in two-step RACH in mobile communications

Various solutions for skipping uplink transmission with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether a padding buffer status report (BSR) is included in a protocol data unit (PDU). The apparatus may skip transmission of the PDU when the padding BSR is included in the PDU. The PDU may comprise a medium access control (MAC) PDU. The MAC PDU may comprise no MAC service data unit (SDU).

Method and apparatus for skipping uplink transmission in mobile communications

Various solutions for handling packet data convergence protocol (PDCP) duplication with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether a PDCP entity is associated with two radio link control (RLC) entities. The apparatus may determine whether PDCP duplication is activated. The apparatus may select one of the two RLC entities to transmit a PDCP control protocol data unit (PDU) in an event that the PDCP entity is associated with the two RLC entities and the PDCP duplication is activated.

Method and apparatus for handling packet data convergence protocol duplication in mobile communications

Various solutions for detecting consistent listen before talk (LBT) failure with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether an LBT failure is detected. The apparatus may start a first timer in an event that the LBT failure is detected. The apparatus may increase an LBT counter. The apparatus may determine whether the LBT counter reaches a threshold value. The apparatus may determine a consistent LBT failure event in an event that the LBT counter reaches the threshold value.

Method and apparatus for detecting consistent listen before talk failure in mobile communications

Various solutions for transmission without dynamic scheduling with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a configured grant. The apparatus may select an allowed logical channel to use the configured grant. The apparatus may schedule uplink data from the allowed logical channel to a protocol data unit (PDU). The apparatus may transmit the PDU on the configured grant.

Method and apparatus for transmission without dynamic scheduling in mobile communications

Various solutions for handling data duplication with respect to user equipment and network apparatus in mobile communications are described. An apparatus may establish a first link and a second link with a network. The apparatus may generate a first protocol data unit (PDU) to transmit on the first link. The apparatus may generate a second PDU to transmit on the second link. The apparatus may transmit the first PDU on the first link. The apparatus may determine whether to discard the second PDU according to a condition. The second PDU may be duplicated from the first PDU.

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Cambridge, United Kingdom

Mehmet Kunt