Embodiments include 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. Such 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. Such 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.

In user equipment, a wireless interface circuit simultaneously communicates with two communication networks. A control circuit decides to use a first reserved power of one communication network where URLLC transmission is necessary, and a second reserved power of the other communication network in which the URLLC is not operated, for the URLLC transmission as to the one communication network. The wireless interface circuit transmits URLLC signals over the one communication network, using the first reserved power and the second reserved power.

When a first node is considering setup of dual-connectivity service for a UE, the first node will take into consideration data-buffer occupancy of one or more candidate second nodes, in order to decide whether to set up the dual-connectivity service for the UE and/or to decide which of multiple second nodes to use for the UE's dual-connectivity service. For instance, if a candidate second node has threshold high data-buffer occupancy, then, based on that fact, the first node may decide to not use that second node for dual-connectivity service of the UE. Or the first node may decide to use a given candidate second node based on the given candidate second node having lower data-buffer occupancy than one or more other candidate second nodes. Further, data-buffer occupancy could be based on downlink data buffering and/or uplink data buffering.

Policy based dual connectivity traffic steering is described herein. A master Long-Term Evolution (LTE) base station may operate in conjunction with a secondary New Radio (NR) base station to provide dual connectivity to user equipment (UE) operating in an environment. The LTE base station can steer traffic between the LTE base station and the NR base station based at least in part on policy information received at the LTE base station. The policy information can indicate, for a particular UE and for a particular Quality of Service (QoS) Class Identifier (QCI), whether the LTE base station can transfer a communication to the NR base station. Thus, traffic steering determinations can be based on the policy information, quality identifiers, device capability, signal strength(s), load level(s), and the like, thereby providing a flexible framework for steering wireless traffic in a dual connectivity environment.

Provided is a method for optimizing radio resource for Ultra-Reliable Low Latency Communication services in a Dual Connectivity technology. The method includes: receiving DownLink (DL) data by a UE using a first Radio Access Technology (RAT) from a base station; transmitting a first Acknowledgement (ACK) signal using the first RAT to the base station based on the DL data being successfully received; updating a Mapping Table Sequence Number of the DL data in a Mapping Table by the UE, based on the DL data being successfully received by the UE using the first RAT; checking the Mapping Table by the UE upon detecting an error in the received DL data using a second RAT; and sending a second ACK signal to the base station using the second RAT of the UE based on the Mapping Table Sequence Number of the DL data being found in the Mapping Table.

Provided are a method and an apparatus for performing a secondary node change procedure disclosed by a source secondary node in a wireless communication system. A master node receives a secondary node change request message from the source secondary node, transmits a secondary node addition request message to a target secondary node, receives a secondary node addition request confirm message from the target secondary node, and transmits a secondary node change request confirm message to the source secondary node.

Embodiments of the present disclosure provide a reconfiguration method and related products, where the method includes: receiving, by a user equipment, a reconfiguration instruction from a network device, wherein the reconfiguration instruction is used to instruct reconfiguration of a PDCP layer; reconfiguring the PDCP layer and transmitting an EM) by the user equipment. Embodiments of the present disclosure can prevent other bearers from being affected by a change in the PDCP layer, thereby ensuring data continuity of other services.

Embodiments herein provide a method and system for performing a bearer type change of a plurality of radio bearers configured for a User Equipment (UE). The proposed method includes changing the bearer type of specific bearer by the network. Further, the proposed method includes checking any changes in keys or PDCP termination point or PDCP version change. Furthermore, the proposed method includes notifying the UE to change the bearer type either through reconfiguration procedure without handover or SN change procedure or reconfiguration procedure with handover or SN change procedure. The network indicates one or more operations to the UE for performing the bearer type change.

A radio station (2) transmits configuration information (501) to a radio terminal (1). The configuration information (501) indicates, on a cell-by-cell basis, at least one specific cell on which the radio terminal (1) is allowed to perform at least one of data transmission and data reception on a radio bearer used for uplink transmission or downlink transmission or both via a common Packet Data Convergence Protocol (PDCP) layer (402). As a result, in a radio architecture that provides tight interworking of two different Radio Access Technologies (RATs), it is for example possible to allow an eNB to indicate, to a radio terminal (UE), a specific cell on which the UE should perform uplink transmission.

A user equipment (UE) and an operating method of the UE in a communication system are provided. The method includes establishing a first connection with a first cell using a first access technology; transmitting, through the first cell via the first connection, capability information on data communication with a second cell using a second access technology, which is different from the first access technology; receiving first data through the first cell via the first connection; receiving configuration information related to the second cell through the first cell via the first connection; establishing a second connection with the second cell using the second access technology; and receiving second data through the second cell via the second connection, while the first data is received through the first cell.