Wireless communication method and device to facilitate interworking of a user equipment (UE) between a non-public network (NPN) and multiple public land mobile networks (PLMN)
A wireless communication method and device are provided. The method includes: receiving, by a terminal device, first indication information indicating that the terminal device and a first Public Land Mobile Network (PLMN) are capable of interworking with each other. With the first indication information, the terminal device and the first PLMN can interwork with each other. That is, with the first indication information, the terminal device can access an IMS in the first PLMN. It is possible to not only enable the terminal device in an NPN to be connected to the IMS, but also avoid separate deployment of the IMS in the NPN, such that the network deployment cost and system complexity can be reduced.
1 . A wireless communication method, comprising:
establishing, by a user equipment (UE), a packet data unit (PDU) session in a non-public network (NPN) using a second public land mobile network (PLMN), wherein the UE is registered in the NPN using a credential of the second PLMN;
receiving, by the UE from a base station of the NPN, a radio resource control (RRC) connection release message, wherein the RRC connection release message includes a first indication information indicating that the UE and a first PLMN are capable of interworking with each other, and wherein the RRC connection release message indicates a release of an RRC connection between the UE and the base station; and
transmitting, by the UE and based on the RRC connection release message, a request to a core network device of the first PLMN to establish the PDU session in the first PLMN as an existing session,
wherein the first PLMN is different than the second PLMN.
2 . The method according to claim 1 , wherein the first indication information is received from an NPN access and mobility management function (AMF) in an NPN registration process.
3 . The method according to claim 1 , wherein the RRC connection release message further includes a second indication information used to identify the first PLMN.
4 . The method according to claim 1 , further comprising:
transmitting, by the UE, an uplink non-access stratum (NAS) transport message to a first access and mobility management function (AMF), wherein the uplink NAS transport message includes request type information that indicates that the UE has established the PDU session in the NPN, and the first AMF is in the first PLMN.
5 . The method according to claim 1 , wherein the PDU session is used for a quality of service (QoS) flow of a voice service in an Internet Protocol (IP) Multimedia System (IMS).
6 . The method according to claim 5 , wherein a rejection of an establishment of the QoS flow triggers a migration of the PDU session.
7 . A user equipment (UE) configured for wireless communication, the UE comprising:
a transmitter; and
a receiver;
wherein:
the transmitter and receiver are collectively configured to establish a packet data unit (PDU) session in a non-public network (NPN) using a second public land mobile network (PLMN), wherein the UE is registered in the NPN using a credential of the second PLMN;
the receiver is configured to receive, from a base station of the NPN, a radio resource control (RRC) connection release message, wherein the RRC connection release message includes a first indication information indicating that the UE and a first PLMN are capable of interworking with each other, and wherein the RRC connection release message indicates a release of an RRC connection between the UE and the base station; and
the transmitter is configured to transmit, based on the RRC connection release message, a request to a core network device of the first PLMN to establish the PDU session in the first PLMN as an existing session,
wherein the first PLMN is different than the second PLMN.
8 . The UE according to claim 7 , wherein the first indication information is received from an NPN access and mobility management function (AMF) in an NPN registration process.
9 . The UE according to claim 7 , wherein the RRC connection release message further includes a second indication information used to identify the first PLMN.
10 . The UE according to claim 7 , wherein the transmitter is further configured to:
transmit an uplink non-access stratum (NAS) transport message to a first access and mobility management function (AMF), wherein the uplink NAS transport message includes request type information that indicates that the UE has established the PDU session in the NPN, wherein the first AMF is in the first PLMN.
11 . The UE according to claim 7 , wherein the PDU session is used for a quality of service (QoS) flow of a voice service in an Internet Protocol (IP) Multimedia System (IMS).
12 . The UE of claim 11 , wherein a rejection of an establishment of the QoS flow triggers a migration of the PDU session.
13 . A base station in a wireless communication system, the base station comprising:
a transmitter; and
a receiver;
wherein:
the receiver is configured to receive, from a first core network device, a first indication information indicating that a user equipment (UE) and a first public land mobile network (PLMN) are capable of interworking with each other, wherein the UE has established a packet data unit (PDU) session in a non-public network (NPN) using a second PLMN, wherein the UE is registered in the NPN using a credential of the second PLMN; and
the transmitter is configured to transmit, to the UE, a radio resource control (RRC) connection release message, wherein the RRC connection release message includes the first indication information, and wherein the RRC connection release message indicates a release of an RRC connection between the UE and the base station,
wherein the first PLMN is different than the second PLMN.
14 . The base station according to claim 13 , wherein the first core network device is an NPN access and mobility management function (AMF) and the first indication information is received in an NPN registration process.
15 . The base station according to claim 13 , wherein the RRC connection release message further includes a second indication information used to identify the first PLMN.
16 . The base station according to claim 13 , wherein the PDU session is used for a quality of service (QoS) flow of a voice service in an Internet Protocol (IP) Multimedia System (IMS).
17 . The base station according to claim 16 , further comprising a second transmitter configured to transmit a rejection of an establishment of the QoS flow to a second core network device of the second PLMN.