The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method and equipment for handover are provided. The method includes informing, by a source base station, a source core network whether a direct data forwarding path is available, determining, by the source core network, whether to use direct data forwarding or indirect data forwarding, informing, by the source core network, a target core network of information of direct data forwarding, indirect data forwarding or data forwarding being not possible, informing, by the target core network, a target base station of the information of direct data forwarding, indirect data forwarding or data forwarding being not possible, and allocating, by the target base station, tunnel information for data forwarding.

Exemplary embodiments include a method, performed by a session management function (V-SMF) of a visited public land mobile network (VPLMN), for establishing a user-requested PDU session to be routed through the user's home PLMN (HPLMN). Such embodiments include receiving, from an access management function (AMF) in the HPLMN, a first request to establish a home-routed PDU session, wherein the first request identifies an SMF (H-SMF) in the HPLMN. Such embodiments also include sending, to the H-SMF, a second request to create the home-routed PDU session. The second request can include an identifier of a resource in the V-SMF associated with the PDU session; and one or more indicators of whether the V-SMF supports respective one or more features related to receiving, from the H-SMF, an identifier of a resource in the H-SMF that is associated with the PDU session. Embodiments also include complementary methods performed by the H-SMF.

Exemplary embodiments include a method, performed by a session management function (V-SMF) of a visited public land mobile network (VPLMN), for establishing a user-requested PDU session to be routed through the user's home PLMN (HPLMN). Such embodiments include receiving, from an access management function (AMF) in the HPLMN, a first request to establish a home-routed PDU session, wherein the first request identifies an SMF (H-SMF) in the HPLMN. Such embodiments also include sending, to the H-SMF, a second request to create the home-routed PDU session. The second request can include an identifier of a resource in the V-SMF associated with the PDU session; and one or more indicators of whether the V-SMF supports respective one or more features related to receiving, from the H-SMF, an identifier of a resource in the H-SMF that is associated with the PDU session. Embodiments also include complementary methods performed by the H-SMF.

One example method of operation may include receiving a call message intended for a call recipient, removing one or more portions of call message data included in the call message, identifying one or more of a trunk group and an entry point associated with the received call message, adding one or more of a trunk group identifier (TGRP) and a universally unique identifier (UUID) to the call message to create a modified call message, and forwarding the modified call message to a destination network associated with the call recipient.

One example method of operation may include receiving a call message intended for a call recipient, removing one or more portions of call message data included in the call message, identifying one or more of a trunk group and an entry point associated with the received call message, adding one or more of a trunk group identifier (TGRP) and a universally unique identifier (UUID) to the call message to create a modified call message, and forwarding the modified call message to a destination network associated with the call recipient.

One embodiment of the present specification can provide a method for performing a protocol data unit (PDU) session-related procedure. The method can comprise the steps of: transmitting, to a session management function (SMF) device, a PDU session-related message including a first indication related to communication through a PC5 link; and receiving a response message from the SMF device. The response message can include: a first quality of service (QoS) rule to be used on a Uu link; a second QoS rule to be used on a PC5 link; and a path selection rule about whether data should be transmitted through the Uu link or the PC5 link.

In a telecommunication system comprising multiple switching nodes (10, 20, 30) having a respective local server (C1, C2, C3) and associated terminals (D1, D2, D3, D4) located within a network and a central DSS server (DSS) for controlling the telecommunication system by using a general switching protocol, the terminals (D1, D2, D3, D4) of a switching node (10, 20, 30) are controlled by the local server (C1, C2, C3) under a local protocol comprising control commands for node-internal call pickup. The pickup of a call directed from a third terminal (D4) to a first terminal (D3) assigned to a first switching node (10) through a second terminal (D1) assigned to another, second switching node (20) occurs across nodes by using the general switching protocol through transferring the control commands provided in the local protocol for call pickup to the general switching protocol and providing them across nodes through the central DSS server (DSS) to the multiple switching nodes (10, 20, 30) located within the network, and converting the registration of a terminal (D1, D2, D3, D4) for call pickup provided in the local protocol to the general switching protocol and forwarding it to the central DSS server.

In a telecommunication system comprising multiple switching nodes (10, 20, 30) having a respective local server (C1, C2, C3) and associated terminals (D1, D2, D3, D4) located within a network and a central DSS server (DSS) for controlling the telecommunication system by using a general switching protocol, the terminals (D1, D2, D3, D4) of a switching node (10, 20, 30) are controlled by the local server (C1, C2, C3) under a local protocol comprising control commands for node-internal call pickup. The pickup of a call directed from a third terminal (D4) to a first terminal (D3) assigned to a first switching node (10) through a second terminal (D1) assigned to another, second switching node (20) occurs across nodes by using the general switching protocol through transferring the control commands provided in the local protocol for call pickup to the general switching protocol and providing them across nodes through the central DSS server (DSS) to the multiple switching nodes (10, 20, 30) located within the network, and converting the registration of a terminal (D1, D2, D3, D4) for call pickup provided in the local protocol to the general switching protocol and forwarding it to the central DSS server.

This application provides a data transmission method. In the method, a first access network device and a second access network device establish a data radio bearer (DRB)-based tunnel and a session-based tunnel. The second access network device sends a Packet Data Convergence Protocol (PDCP) layer data packet to the first access network device via the DRB-based tunnel; and the second access network device sends a Service Data Adaptation Protocol (SDAP) layer data packet to the first access network device via the session-based tunnel.

This application provides a data transmission method. In the method, a first access network device and a second access network device establish a data radio bearer (DRB)-based tunnel and a session-based tunnel. The second access network device sends a Packet Data Convergence Protocol (PDCP) layer data packet to the first access network device via the DRB-based tunnel; and the second access network device sends a Service Data Adaptation Protocol (SDAP) layer data packet to the first access network device via the session-based tunnel.