Telefonaktiebolaget Lm Ericsson (publ)

Jose Angel Leon Calvo

Congchi Zhang

Muhammad Ali Kazmi

Stefan Parkvall

Gabor Fodor

Zhang Zhang

Mats Folke

Santhan Thangarasa

Ricardo Blasco Serrano

Shehzad Ali Ashraf

Jörg Huschke

Antonino Orsino

Hieu Do

Liang Hu

Erik Stare

Ratheesh Kumar Mungara

Smriti Gopinath

Jeong Hun Kim

A D2D communication device sends a synchronization signal to enable synchronization of one or more other D2D communication devices. The D2D communication device provides the synchronization signal with an indication that the synchronization signal is derived from a D2D communication device configured as a synchronization master which, when not being synchronized to an external synchronization reference, has a higher priority to be used as a synchronization source than other D2D communication devices not synchronized to an external synchronization reference.

Priority management for D2D communication devices as synchronization source

Embodiments described herein relate to methods and apparatus for communicating between devices using sidelinks. There is provided a method performed by a transmitting device for transmitting a packet to a destination device. The method comprises duplicating the packet and adding header information to form duplicated modified packets, each having a respective duplication identifier. Multiple wireless pathways to the destination device are determined, each wireless pathway comprising a sidelink. The duplicated modified packets are transmitted onto respective wireless pathways.

Packet duplication over multiple sidelinks

Embodiments include methods, performed by a user equipment (UE), for hybrid ARQ (HARQ) feedback in relation to multicast transmissions from a network node in a radio access network (RAN). Such methods include receiving, from the network node, first downlink control information (DCI) scheduling a first multicast transmission associated with the UE and determining a HARQ feedback mode for the first multicast transmission. Such methods also include, based on the first DCI, attempting to decode the first multicast transmission; and selectively transmitting HARQ feedback related to the first multicast transmission to the network node based on the determined HARQ feedback mode and on whether the attempt to decode is successful or unsuccessful. Embodiments also include complementary methods for a network node, as well as UEs and network nodes configured to perform such methods.

Hybrid automatic repeat request (HARQ) mechanism for multicast in NR

Power control for a bidirectional Sidelink (SL) is provided. Solutions proposed herein limit the Physical SL Feedback Channel (PSFCH) transmit power level to that of the power level used for Physical SL Shared Channel (PSSCH) so as to prohibit too high transmit power for the PSFCH. In addition, if the difference between the PSSCH and PSFCH exceeds a preconfigured threshold (e.g., the PSFCH is too low), a Receiver (Rx) User Equipment (UE) can take preventive actions that ensure sufficient quality over the PSFCH. In further embodiments, both UEs continuously maintain the estimated SL Path Loss (PL) and transmit a single SL Channel State Information Reference Signal (SCSI-RS), and associated measurement reports rather than triggering new SCSI-RS transmissions and measurement reports for each PSSCH and associated PSFCH channel per SL (e.g., PC5) connection.

Power control for bidirectional sidelink

A first and second UE are connected via a PC5 unicast link. Both maintain a list of potential Side link relay UEs and agree on a common list of UEs that appear in both lists. When the first UE detects that the second UE has trouble receiving it's transmission, e.g. ack/nack timeout or high level of NACKs, decide to use a third UE from the common list as Side Link relay towards the second UE.

Maintaining sidelink (SL) operation under radio link failure (RLF) using UE-to-UE relay

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Aachen, Germany

Jose Angel Leon Calvo