Abstract: Systems, methods and apparatus are disclosed for user equipment and network nodes. An example method performed by a user equipment (UE) includes the UE detecting a failure relating to a connection between the UE and a Master Cell Group (MCG). The UE provides, to a master node via a Secondary Cell Group, SCG, a first message relating to the detected failure. The UE receives, from the master node via the SCG, a second message indicating to the UE to perform a connection reconfiguration. An example method performed by the master node includes the master node receiving, from the UE via the SCG, the first message including information relating to the detected failure of the connection between the UE and the MCG. The master node determines, based on the first message and a user equipment context, to perform a connection reconfiguration. The master node provides, to the UE via the SCG, the second message indicating to perform the connection reconfiguration.

Abstract: A wireless transmit-receive unit (WTRU) may receive an indication to switch from a point-to-point (FTP) transmission mode to a point-to-multipoint (PTM) transmission mode or determine to switch from the PTP transmission mode to the PTM transmission mode based on a reliability condition associated with the PTM mode. Based on the indication or the determination, the WTRU may switch from the PTP transmission mode to the PTM transmission mode. The WTRU may receive a first data packet. The WTRU may extend a data packet reception window by extending a boundary of the data packet reception window. The boundary may be extended based on a sequence number (SN) of the first data packet and an offset.

Abstract: Embodiments includes methods for a centralized unit (CU) in an integrated access backhaul (IAB) network. Such methods include determining a first identifier of a first backhaul radio link control (BH RLC) channel between first and second nodes in the IAB network. The second node is a child node of the first node. Such methods include sending, to the second node, a second request to setup a second BH RLC channel between the second node and a third node in the IAB network. The third node is a child node of the second node, and the second request includes the first identifier for association with the second BH RLC channel. In some embodiments, at least one data radio bearer between a user equipment (UE) and the CU is associated with both the first and second BH RLC channels. Other embodiments include complementary methods for an intermediate node in the IAB network.

Abstract: The disclosure pertains to methods and apparatus for performing handover by a relay Wireless Transmit/Receive Unit (WTRU) from a source parent WTRU to a target parent WTRU in a wireless network comprising: obtaining uplink data determining, a channel quality for a first link between the relay WTRU and the source parent WTRU, and a channel quality for a second link between the relay WTRU and the target parent WTRU; sending, the uplink data via the first link and the second link based on any of: (1) the determined channel quality for the first link, (2) the determined channel quality for the second link, and/or (3) load conditions; and sending, to a child WTRU served by the relay WTRU via a third link, information indicating a handover of the relay WTRU from the source parent WTRU to the target parent WTRU.

Abstract: According to some embodiments, a method for use in a user equipment (UE) of resuming a radio bearer in a wireless communication network comprises: establishing a radio resource control (RRC) connection with a first network node; receiving a connection suspend message from the first network node; storing a configuration of a radio bearer associated with the RRC connection; suspending the radio bearer associated with the RRC connection; receiving a connection resume message; determining whether the connection resume message includes configuration information for NR packet data convergence protocol (PDCP) for the suspended radio bearer; upon determining the connection resume message includes configuration information for a NR PDCP, configuring the suspended radio bearer with the configuration information; and resuming the suspended radio bearer.

Abstract: The disclosure pertains to methods and apparatus for a mobility action in IAB in wireless communication networks. A method implemented in a Wireless Transmit/Receive Unit (WTRU) may comprises the steps of: determining traffic load information associated with a parent node; measuring received power of candidate parent nodes; selecting a candidate parent node based on the measured received power; performing a mobility action to the selected candidate parent node based on the determined traffic load information; and transmitting, to a child node, a message, the message comprising an information indicating the selected candidate.

Abstract: A method performed by a first base station, is described. The first base station determines a change in one or more measurements to be performed by a UE. The measurements are associated with a first set of frequencies. The first base station also transmits a first message to a second base station comprising information regarding which frequencies in the first set are to be changed. The first base station and the second base station serve the UE. A method performed by the second base station is also described whereby the second base station receives the first message. In a method performed by the UE, the UE receives, from the first base station, a configuration message configured to specify the measurements to perform and a measurement gap configuration. The UE then takes the measurements based on the configuration message.

Abstract: Embodiments described herein include a method, in a user equipment, UE, operating in dual connectivity, DC, with a master node, MN, and a secondary node, SN, for suspending a secondary cell group, SCG. The method comprises receiving, from a first radio network node, RNN, a command to suspend the SCG, and, in response to receiving the command, suspending the SCG. This first RNN may be the MN or the SN, in various embodiments. In some embodiments the method may further comprise receiving a command to resume operation with the SCG and, in response to the command to resume operation, resuming operation with the SCG.

Abstract: Systems, methods, and apparatus are disclosed for a user equipment. An example method performed by a user equipment includes establishing a connection to a Radio Access Network (RAN) via a first network node. Communications are provided over the connection using Signaling Radio Bearer 1 (SRB1) configured with a New Radio (NR) Packet Data Convergence Protocol (PDCP). After the connection is suspended, the user equipment receives a Radio Resource Control (RRC) connection re-establishment message from a second network node. The connection re-establishment message includes a radioResourceConfigDedicated information element (IE). The user equipment re-establishes the connection to the RAN by applying a Long-Term Evolution (LTE) PDCP configuration to SRB1, performing a radio resource configuration procedure in accordance with the radioResourceConfigDedicated IE, and sending an RRC connection re-establishment complete message to the second network node.

Abstract: Methods and apparatus are provided. In an example aspect, a method in a User Equipment (UE) of performing a RRC re-establishment procedure is provided. The method comprises receiving an instruction from a network node to perform a RRC re-establishment procedure, and transmitting a RRC re-establishment request.

Abstract: Systems and methods are disclosed herein that relate to handling of dormant state measurement configurations and associated measurements upon inter-Radio Access Technology (RAT) cell reselection. In some embodiments, a method performed by a wireless device comprises receiving one or more dormant state measurement configurations from a network node of a source RAT, performing measurements while in a dormant state in accordance with at least one of the one or more dormant state measurement configurations, and performing an inter-RAT cell reselection from the source RAT to a target RAT while in the dormant state. The method further comprises, upon performing the inter-RAT cell reselection, performing one or more actions to handle dormant state measurement configurations and/or measurements performed in accordance with dormant state measurement configurations. Corresponding embodiments of a wireless device are also disclosed.

Abstract: Embodiments include methods performed by a first network node arranged as an ancestor node of a second network node in an Integrated Access Backhaul (IAB) network. Such methods include determining that the second network node is migrating from a first centralized unit (CU) to a second CU and, based on determining that the second network node is migrating from the first CU to the second CU, performing modified handling of buffered data associated with the second network node, including at least one of the following: uplink (UL) data buffered at the first network node, downlink (DL) data buffered at the first network node, and UL data buffered at one or more child nodes of the first network node. Other embodiments include complementary methods for a first CU, as well as network nodes (e.g., IAB nodes, distributed units, CUs) configured to perform such methods.

Abstract: Methods and apparatus are provided. In an example aspect, a method in a User Equipment (UE) of providing data in a PDCP message to a layer above a PDCP layer is provided. The method includes receiving an indication that a PDCP message received at the UE should bypass a PDCP reordering process, and providing data in the PDCP message to a layer above a PDCP layer without using the PDCP reordering process.

Abstract: Methods for a target node to establish a connection with a user equipment (UE) operating in dual connectivity (DC) with a primary cell (PCell) served by a master node and with a primary secondary cell (PSCell) served by a secondary node. The methods include receiving, from the UE, a re-establishment request message comprising parameters associated with the PSCell, a message authentication code, and an indication of the UE's selection of a target cell served by the target node as a replacement for the PCell, which utilizes a first radio access technology (RAT). The PSCell and the target cell utilize a different second RAT. The methods include, based on the parameters associated with the PSCell, determining a full UE context for the UE, and establishing a connection with the UE based on the full UE context, whereby the target cell will serve as a PCell for DC.

Abstract: Example embodiments presented herein are directed towards a wireless terminal and base station, and corresponding methods therein, for providing a handover for a subset of bearers associated with the wireless terminal. The subset of bearers is less than a total number of bearers associated with the wireless terminal. Thus, upon the completion of the handover procedure, at least one bearer will stay connected with a source base station.

Abstract: A method performed by a wireless terminal operating in Multi-Radio Dual Connectivity (MR-DC) and configured with a first cell group associated with a first network node and a second cell group associated with a second network node and a wireless terminal is provided. The method includes monitoring conditions and events for indicating that an operating mode of the second cell group should be modified. The method includes transmitting an indication to a network requesting a modification for the operating mode of the second cell group responsive to the monitoring indicating the operating mode of the second cell group should be modified. The method includes receiving a command from the network to change the operating mode of the second cell group. The method includes responsive to receiving the command, applying the command and start operating the second cell group in the indicated operating mode.

Abstract: A method is performed by a source Central Unit (CU) in an Integrated Access and Wireless Access Backhaul (IAB) network. The method includes transmitting, by the source CU, a message requesting a handover of a plurality of migrating devices associated with a first IAB node migrating from the source CU to a target CU. The message comprises at least one globally unique identifier of at least one management function serving the plurality of migrating devices.

Abstract: According to certain embodiments, a method in a network node for performing a group handover comprises receiving an indication to perform a bearer context operation on a plurality of bearer contexts and performing the indicated bearer operation on the plurality of bearer contexts.

Abstract: An integrated access backhaul, IAB, node (12) migrates a control plane connection (22) of the IAB node (12) from first radio network equipment (14A) to second radio network equipment (14B). After migrating the control plane connection (22), the IAB node (12) at least temporarily maintains a radio network layer application protocol connection (24) between the IAB node (12) and the first radio network equipment (14A).

Abstract: A method by an integrated access backhaul (IAB) node in a radio network includes generating a delivery status that indicates a status of a data connection, the data connection has a logical interface connection to a central unit (CU) node, the logical interface connection of the data connection is not terminated at the IAB node, and transmitting the delivery status to the CU node. The data connection may be a radio bearer.