This application provides a method for signal reception and transmission in a measurement gap. User equipment (UE) obtains, in dual connectivity, a measurement configuration delivered by a base station, and determines a first cell group in which signal reception and transmission can be performed in the measurement gap; performs signal reception and transmission with the base station in the first cell group in the measurement gap; and performs inter-frequency or inter-RAT measurement in a second cell group. The second cell group is a cell group in which signal reception or transmission cannot be performed in the measurement gap. In the measurement gap, the base station and the UE can still receive and transmit signals in the first cell group, and radio frequency channels of the UE that support signal reception and transmission in the measurement gap can be fully used for performing signal reception and transmission.

Methods and apparatuses for mobility between different communication systems are disclosed. According to an embodiment, a session management function (SMF) sends, to a service provider, a request for registering information related to the SMF to the service provider. The information related to the SMF comprises information indicating or derived from an Internet protocol (IP) address of a packet data network (PDN) gateway (PGW) control plane (PGW-C) that is combined together with the SMF. The SMF receives, from the service provider, a response to the request.

A control plane function entity for session management is operative to enable 5G to 4G to 3G mobility for a user equipment (UE). Initially, the entity may communicate one or more messages in a procedure for a handover of a session of the UE from a Fifth Generation System (5GS) to an Evolved Packet System (EPS). The entity may identify whether one or more indications indicate a need to provide 2G and/or 3G parameters. Based on identifying the one or more indications, the entity may communicate one or more messages in a bearer modification procedure with a bearer Quality of Service (QoS) update. In some implementations, the control plane function entity may identify the need to provide the 2G and/or the 3G parameters when the session is originally established in 5GS or when QoS parameters of a QoS Flow of the session are modified while the UE was in 5GS.

A wireless communication method, a terminal device and a network device are provided. The method includes: obtaining, by a terminal device, characteristic information of a neighbor cell; and transmitting, by the terminal device, first information to a network device, the first information including the characteristic information of the neighbor cell and/or characteristic information of the terminal device.

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.

A communication device for handling communications in a dual connectivity comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The storage device stores, and the processing circuit is configured to execute instructions of establishing a first signaling radio bearer (SRB) with a master base station (MBS); establishing a second SRB with a secondary BS (SBS); receiving a first radio resource control (RRC) message comprising a first configuration, on the first SRB from the MBS; receiving a second RRC message comprising a second configuration, on the second SRB from the SBS; and applying the first configuration and ignoring the second configuration, when detecting a conflict between the first configuration and the second configuration.

A method applied to an application scenario in which the terminal device initiates connection reestablishment, comprises: selecting a first cell; when a radio access technology (RAT) of the first cell is the same as a RAT of a source cell, sending, a first message to a reselected radio access network device, and receiving a second message from the reselected radio access network device, wherein the second message is used to indicate the terminal device to establish a connection to the reselected radio access network device.

A base station of a dual connectivity cellular network is provided. The base station provides a first wireless connectivity of a first regulated wireless communication standard to a user equipment (UE) of a cellular network via a master node of the base station. User plane data is forwarded to the UE through the master node according to a first user plane path. The base station requests a secondary node to provide a second wireless connectivity of a second regulated wireless communication standard to the UE. When the master node is configured by a first configuration, the user plane data is forwarded to the UE through the secondary node according to the second user plane path that is established with the cellular network. When the master node is configured by a second configuration, the user plane data is forwarded to the UE through the secondary node according to the first user plane path.

In a radio communication system, a split bearer that passes from a core network to a secondary cell group and branches from gNB 100B included in the secondary cell group to eNB 100A included in a master cell group is set, and data is transmitted to a user equipment via thus set split bearer. The gNB 100B transmits, to the eNB 100A, Use of SCG Radio Resource that indicates whether to configure a split bearer that uses a radio resource between the user equipment and the gNB 100B. The eNB 100A sets the split bearer based on the received Use of SCG Radio Resource.

A second RAN node (2) associated with a second RAT sends a radio resource configuration of the second RAT to a radio terminal (3) via a first RAN node (1) associated with a first RAT. The radio resource configuration explicitly or implicitly indicates at least one numerology that is included in multiple numerologies supported by the second RAT and is different from a reference numerology. It is thus, for example, possible to allow a radio terminal to be configured with a numerology of a cell served by a secondary gNB or a target gNB in Inter-RAT Dual Connectivity between E-UTRA and NR and in a handover from E-UTRA to NR.