WO2020186422A1 - Procédé et appareil de retour rapide à 5gs après un repli eps - Google Patents

Procédé et appareil de retour rapide à 5gs après un repli eps Download PDF

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Publication number
WO2020186422A1
WO2020186422A1 PCT/CN2019/078482 CN2019078482W WO2020186422A1 WO 2020186422 A1 WO2020186422 A1 WO 2020186422A1 CN 2019078482 W CN2019078482 W CN 2019078482W WO 2020186422 A1 WO2020186422 A1 WO 2020186422A1
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WIPO (PCT)
Prior art keywords
message
wireless communication
entity
communication system
eps
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PCT/CN2019/078482
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English (en)
Inventor
Zhendong Li
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Zte Corporation
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to CN201980094228.2A priority Critical patent/CN113597785A/zh
Priority to PCT/CN2019/078482 priority patent/WO2020186422A1/fr
Publication of WO2020186422A1 publication Critical patent/WO2020186422A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • This disclosure relates generally to wireless communications and, more particularly, to a method and apparatus for fast return to a 5G system (5GS) upon a completion of Evolved Packet System (EPS) fallback.
  • 5GS 5G system
  • EPS Evolved Packet System
  • EPS fallback i.e., from 5G to 4G
  • 5GS 5G system
  • 4G system Long-Term Evolution
  • the control plane embraces all signaling between network elements while the user plane carries the IP flows used for voice and e.g. for Internet access.
  • EPS fallback enables phones to use the 5GC with New Radio prior to all needed voice features are in place in the phone and in New Generation-Radio Access Network (NG-RAN) and before the NG-RAN is dimensioned and tuned for voice.
  • NG-RAN New Generation-Radio Access Network
  • IP multimedia subsystem (IMS) network is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP) , providing an open and flexible environment that is independent of access and supporting multimedia applications (e.g., voice) .
  • the IMS network can work over 5G to provide voice services, i.e., voice over New radio (VoNR) , and work over 4G to provide voice service, i.e., voice over LTE (VoLTE) .
  • the 5GS and EPS provide IP connectivity and resources to the IMS network for multimedia applications.
  • exemplary embodiments disclosed herein are directed to solving the issues related to one or more problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings.
  • exemplary systems, methods, and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and not limitation, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of the invention.
  • Inter-system handover or redirection of voice services from a 5GS to an EPS is enabled by common gateways and interworking between network function entities in the two systems.
  • EPS fallback 3GPP TS 23.501 and 23.502
  • PDU Packet Data Unit
  • the common gateway ensures IP address preservation.
  • a UE cannot fast return to the 5GS. Therefore, there exists a need to develop a method and apparatus for fast return to 5GS after EPS fallback.
  • method for performing a fast return to 5G by a first wireless communication node of a first wireless communication system includes: receiving a first message from a first core network of the first wireless communication system; and returning a wireless communication device to a second wireless communication system according to the first message, wherein the first message comprises an Evolved Packet System (EPS) fallback indication.
  • EPS Evolved Packet System
  • a method for performing a fast return to 5G by a first core network of a first wireless communication system includes: transmitting a first message to a first wireless communication node of the first wireless communication system, wherein the first message comprises an Evolved Packet System (EPS) fallback indication, wherein the EPS fallback indication in the first message is used by the first wireless communication node to return a wireless communication device to a second wireless communication system.
  • EPS Evolved Packet System
  • a computing device comprising at least one processor and a memory coupled to the processor, the at least one processor configured to carry out the method.
  • a non-transitory computer-readable medium having stored thereon computer-executable instructions for carrying out the method.
  • FIG. 1A illustrates an exemplary wireless communication network, in accordance with some embodiments of the present disclosure.
  • FIG. 1B illustrates a block diagram of an exemplary wireless communication system, in accordance with some embodiments of the present disclosure.
  • FIG. 2 illustrates a method for performing a fast returning of a UE to a 5GS, in accordance with some embodiments of the present disclosure.
  • FIG. 3 illustrates a method for performing a fast returning of a UE to a 5GS, in accordance with some embodiments of the present disclosure.
  • FIG. 4 illustrates a method for performing a fast returning of a UE to a 5GS, in accordance with some embodiments of the present disclosure.
  • FIG. 5 illustrates a method for performing a fast returning of a UE to a 5GS, in accordance with some embodiments of the present disclosure.
  • FIG. 1A illustrates an exemplary wireless communication network 100, in accordance with some embodiments of the present disclosure.
  • a wireless communication system comprises at least one network-side wireless communication node, at least one terminal-side communication device, and a core network.
  • the at least one network-side wireless communication node each can be one of the following: a node B, an E-utran Node B (also known as Evolved Node B, eNodeB or eNB) , a gNodeB (also known as gNB) in new radio (NR) technology, a pico station, a femto station, or the like.
  • E-utran Node B also known as Evolved Node B, eNodeB or eNB
  • gNodeB also known as gNB
  • NR new radio
  • the at least one terminal-side wireless communication device each can be one of the following: a long range communication system like a mobile phone, a smart phone, a personal digital assistant (PDA) , tablet, laptop computer, or a short range communication system such as, for example a wearable device, a vehicle with a vehicular communication system and the like.
  • a network-side wireless communication node is represented by a base station (BS) 102 hereinafter in all embodiments, and is generally referred to as “wireless communication node” .
  • a terminal-side communication device is represented by a user equipment (UE) 104 hereinafter in all embodiments, and is generally referred to as “wireless communication devices” .
  • Such communication nodes and devices may be capable of wireless and/or wired communications, in accordance with various embodiments of the invention.
  • the core network in the wireless communication system further comprises a plurality of network function (NF) entities.
  • NF network function
  • the wireless communication network 100 includes a first BS 102-1, and a second BS 102-2, and a UE 104.
  • the first BS 102-1, and the second BS 102-2 each is connected to a respective core network (CN) 108, i.e., the first BS 102-1 is connected to a first CN 108-1 through a first interface 107-1 and a second interface 107-2 and the second BS 102-2 is connected to a second CN 108-2 through a third interface 107-3 and a fourth interface 107-4.
  • the first CN 108-1 is a 5G Core Network (5GC)
  • the second CN 108-2 is an Evolved Packet System (EPS) .
  • the first CN 108-1 and the second CN 108-2 are connected through a fifth interface 156.
  • the interfaces 107-1, 107-2, 107-3, 107-4 and 156 are specifically discussed in detail below.
  • the first CN 108-1 further comprises at least one of the following network function (NF) entities: Access and Mobility Management Function (AMF) 122, User Plane Function (UPF) 126, and System Management Function (SMF) 124.
  • the first CN 108-1 further comprises Policy Control Function (PCF) and Unified Data Management (UDM) .
  • the AMF 122 supports at least one of the following: termination of Non-Access Stratum (NAS) signaling, NAS ciphering and integrity protection, registration management, connection management, mobility management, access authentication and authorization, and security context management.
  • NAS Non-Access Stratum
  • NAS Non-Access Stratum
  • the UPF 126 supports at least one of the following: packet routing and forwarding, packet inspection, Quality of Service (QoS) handling, acts as external Protocol Data Unit (PDU) session point of interconnect to Data Network (DN) , and is an anchor point for intra-and inter-Radio Access Technology (RAT) mobility.
  • the SMF 124 supports at least one of the following: session management (session establishment, modification, and release) , UE IP address allocation and management, Dynamic Host Configuration Protocol (DHCP) functions, termination of NAS signaling related to session management, Downlink (DL) data notification, and traffic steering configuration for UPF for proper traffic routing.
  • session management session establishment, modification, and release
  • DHCP Dynamic Host Configuration Protocol
  • DL Downlink
  • traffic steering configuration for UPF for proper traffic routing.
  • the PCF supports at least one of the following: unified policy framework, providing policy rules to Control Plane (CP) functions, and access subscription information for policy decisions in User Data Repository (UDR) .
  • the UDM supports at least one of the following: generation of Authentication and Key Agreement (AKA) credentials, user identification handling, access authorization and subscription management.
  • the first CN 108-1 has a CP and User Plane (UP) split.
  • the UPF supports UP data processing and the AMF, SMF, PCF, and UDM act as CP functions.
  • the second CN 108-2 further comprises at least one of the following NF entities: Mobility Management Entity (MME) 130, Serving Gateway (SGW) 128, Packet Data Network (PDN) Gateway control plane (PGW-C) 132, and PGW-User plane (PGW-U) 134.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • PDN Packet Data Network
  • PGW-C Gateway control plane
  • PGW-User plane PGW-User plane
  • the second CN 108-2 further comprises Policy and Charging Rules Function (PCRF) , and Home Subscriber Server (HSS) .
  • PCRF Policy and Charging Rules Function
  • HSS Home Subscriber Server
  • the MME 130 of the second CN 108-2 supports at least one of the following: paging and tagging procedure by idle mode UE, bearer activation/deactivation process, choosing a SGW 128 for a UE at the initial attach and during intra-LTE handover, authenticating the user, and ciphering/integrity protection.
  • the SGW 128 supports one of the following: routing and forwarding user data packets, acting as the mobility anchor for the UP during inter-eNB handovers and as the anchor for mobility between LTE and other 3GPP technologies.
  • the PGW 132/134 of the second CN 108-2 supports at least one of the following: connectivity from the UE to external packet data networks, policy enforcement, packet filtering, charging support, lawful interception and packet screening, and activing as an anchor for mobility between 3GPP and non-3GPP technologies.
  • the PCRF of the second CN 108-2 supports at least one of the following: real-time determination of policy rules, aggregates information to and from the network, and creation of rules and automatically making policy decisions for each subscriber active on the network.
  • the HSS of the second CN 108-2 supports at least one of the following: storage of user-related and subscription-related information, mobility management, call and session establishment support, user authentication and access authorization.
  • the first CN 108-1 and the second CN 108-2 share two combo-nodes, i.e., a first combo-node140-1 and a second combo-node 140-2.
  • each of the two combo-nodes comprises two NF entities for both of the first CN 108-1 and the second CN 108-2.
  • the first combo-node 140-1 comprises the UPF 126 of the first CN 108-1 and the PGW-U 134 of the second CN 108-2; and the second combo-node 140-2 comprises the SMF 124 of the first CN 108-1 and the PGW-C 132 of the second CN 108-2.
  • the UE 104 is connected to the AMF 122 of the first CN 108-1 through a logical N1 interface 164 and is connected to the MME of the second CN 108-2 through an EPC interface 166.
  • the first BS 102-1 is connected to the AMF 122 of the first CN 108-1 through the first interface 107-1 (i.e., N2 interface) and is connected to UPF 126 of the first CN 108-1 through the second interface 107-2, i.e., N3 interface.
  • the second BS 102-2 is connected to the SGW 128 of the second CN 108-1 through the fourth interface 107-4, i.e., S1-U interface, and is connected to the MME 130 of the second CN 108-1 through the third interface 107-3, i.e., S1-C interface.
  • the AMF 122 of the first CN 108-1 is connected to the MME 130 of the second CN 108-2 through the fifth interface 156 (i.e., N26 interface) .
  • the SGW 128 of the second CN 108-2 is connected to the MME 130 of the second CN 108-2 through a S11 interface 162.
  • the SGW 128 of the second CN 108-2 is coupled to the first combo- node 140-1 (i.e., the UPF 126 of the first CN 108-1 and the PGW-U of the second CN 108-2) through a S5-U interface 160.
  • the SGW 128 of the second CN 108-2 is connected to the second combo-node 140-2 (i.e., the SMF 124 of the first CN 108-1 and the PGW-C 132 of the second CN 108-2) through a S5-C interface 158.
  • the AMF 122 of the first CN 108-1 is coupled to second combo-node 140-2 (i.e., the SMF 124 of the first CN 108-1 and the PGW-C 132 of the second CN 108-2) through a N11 interface 152.
  • the first combo-node 140-1 is connected to the second combo-node 140-2 through the fifth interface 154, i.e., N4 interface.
  • Figure 1B illustrates a block diagram of an exemplary wireless communication system 150, in accordance with some embodiments of the present disclosure.
  • the system 150 may include components and elements configured to support known or conventional operating features that need not be described in detail herein.
  • the system 150 can be used to transmit and receive data symbols in a wireless communication environment such as the wireless communication network 100 of Figure 1A, as described above.
  • the system 150 generally includes a first BS 102-1, a second BS 102-2, and a UE 104, collectively referred to as BS 102 and UE 104 below for ease of discussion.
  • the first BS 102-1 and the second BS 102-2 each comprises a BS transceiver module 152, a BS antenna array 154, a BS memory module 156, a BS processor module 158, and a network interface 160.
  • each module of the BS 102 are coupled and interconnected with one another as necessary via a data communication bus 180.
  • the UE 104 comprises a UE transceiver module 162, a UE antenna 164, a UE memory module 166, a UE processor module 168, and an I/O interface 169.
  • each module of the UE 104 are coupled and interconnected with one another as necessary via a date communication bus 190.
  • the BS 102 communicates with the UE 104 via a communication channel 192, which can be any wireless channel or other medium known in the art suitable for transmission of data as described herein.
  • the system 150 may further include any number of modules other than the modules shown in Figure 1B.
  • the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof.
  • various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software depends upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present invention.
  • a wireless transmission from a transmitting antenna of the UE 104 to a receiving antenna of the BS 102 is known as an uplink (UL) transmission
  • a wireless transmission from a transmitting antenna of the BS 102 to a receiving antenna of the UE 104 is known as a downlink (DL) transmission
  • the UE transceiver 162 may be referred to herein as an "uplink" transceiver 162 that includes a RF transmitter and receiver circuitry that are each coupled to the UE antenna 164.
  • a duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion.
  • the BS transceiver 152 may be referred to herein as a "downlink" transceiver 152 that includes RF transmitter and receiver circuitry that are each coupled to the antenna array 154.
  • a downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna array 154 in time duplex fashion.
  • the operations of the two transceivers 152 and 162 are coordinated in time such that the uplink receiver is coupled to the uplink UE antenna 164 for reception of transmissions over the wireless communication channel 192 at the same time that the downlink transmitter is coupled to the downlink antenna array 154.
  • there is close synchronization timing with only a minimal guard time between changes in duplex direction.
  • the UE transceiver 162 communicates through the UE antenna 164 with the BS 102 via the wireless communication channel 192.
  • the BS transceiver 152 communications through the BS antenna 154 of a BS (e.g., the first BS 102-1) with the other BS (e.g., the second BS 102-2) via a wireless communication channel 196.
  • the wireless communication channel 196 can be any wireless channel or other medium known in the art suitable for direct communication between BSs.
  • the UE transceiver 162 and the BS transceiver 152 are configured to communicate via the wireless data communication channel 192, and cooperate with a suitably configured RF antenna arrangement 154/164 that can support a particular wireless communication protocol and modulation scheme.
  • the UE transceiver 162 and the BS transceiver 152 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards (e.g., NG-RAN) , and the like. It is understood, however, that the invention is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 162 and the BS transceiver 152 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
  • the processor modules 158 and 168 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein.
  • a processor module may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like.
  • a processor module may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 158 and 168, respectively, or in any practical combination thereof.
  • the memory modules 156 and 166 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • the memory modules 156 and 166 may be coupled to the processor modules 158 and 168, respectively, such that the processors modules 158 and 168 can read information from, and write information to, memory modules 156 and 166, respectively.
  • the memory modules 156 and 166 may also be integrated into their respective processor modules 158 and 168.
  • the memory modules 156 and 166 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 158 and 168, respectively.
  • the memory modules 156 and 166 may also each include non-volatile memory for storing instructions to be executed by the processor modules 158 and 168, respectively.
  • the network interface 160 generally represents the hardware, software, firmware, processing logic, and/or other components of the base station 102 that enable bi-directional communication between BS transceiver 152 and other network components and communication nodes configured to communication with the BS 102.
  • network interface 160 may be configured to support internet or WiMAX traffic.
  • network interface 160 provides an 802.3 Ethernet interface such that BS transceiver 152 can communicate with a conventional Ethernet based computer network.
  • the network interface 160 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) .
  • MSC Mobile Switching Center
  • the terms “configured for” or “configured to” as used herein with respect to a specified operation or function refers to a device, component, circuit, structure, machine, signal, etc. that is physically constructed, programmed, formatted and/or arranged to perform the specified operation or function.
  • the network interface 160 could allow the BS 102 to communicate with other BSs or a CN over a wired or wireless connection.
  • the BS 102 repeatedly broadcasts system information associated with the BS 102 to one or more UEs 104 so as to allow the UEs 104 to access the network within the cells (e.g., 110-1 for the first BS 102-1 and 110-2 for the second BS 102-2) where the BS 102 is located, and in general, to operate properly within the cell.
  • Plural information such as, for example, downlink and uplink cell bandwidths, downlink and uplink configuration, cell information, configuration for random access, etc., can be included in the system information, which will be discussed in further detail below.
  • the major system information carried by the first broadcast signal may be transmitted by the BS 102 in a symbol format via the communication channel 192 (e.g., a PBCH) .
  • an original form of the major system information may be presented as one or more sequences of digital bits and the one or more sequences of digital bits may be processed through plural steps (e.g., coding, scrambling, modulation, mapping steps, etc. ) , all of which can be processed by the BS processor module 158, to become the first broadcast signal.
  • the UE processor module 168 may perform plural steps (de-mapping, demodulation, decoding steps, etc. ) to estimate the major system information such as, for example, bit locations, bit numbers, etc., of the bits of the major system information.
  • the UE processor module 168 is also coupled to the I/O interface 169, which provides the UE 104 with the ability to connect to other devices such as computers.
  • the I/O interface 169 is the communication path between these accessories and the UE processor module 168.
  • FIG. 2 illustrates a method 200 for performing fast return to a 5GS, in accordance with some embodiments of the present disclosure. It is understood that additional operations may be provided before, during, and after the method 200 of Figure 2, and that some operations may be omitted or reordered.
  • the communication system in the illustrated embodiment comprises a first BS 102-1, second BS 102-2, a first CN 108-1, a second CN 108-2, and a UE 104.
  • the UE 104 is in one of at least one serving cell covered by the first BS 102-1 and the second BS 102-2, i.e., the UE 104 is in connection with one of the following: the first BS 102-1 and the second BS 102-2.
  • the UE 104 is in connection with the first BS 102-1 initially.
  • the first BS 102-1 is a NG RAN and the first CN 108-1 is a 5GC
  • the second BS 102-2 is a 4G RAN (i.e., eNB)
  • the second CN 108-2 is an EPC.
  • Figure 2 is for illustration purposes and is not intend to be limiting. It should be noted that that any numbers of BS 102 can be used, which is within the scope of this invention.
  • the method 200 starts with operation 202 in which a first message is transmitted from the first BS 102-1 to the first CN 108-1 according to some embodiments.
  • the first message transmitted by the first BS 102-1 is a handover request message.
  • the first message is received by an AMF of the first CN 108-1.
  • the first message comprises a first information entity (IE) for an EPS fallback indication and in some embodiments, the first IE is carried in a source-to-target transparent container.
  • IE information entity
  • the first IE for the EPS fallback indication has a binary value, e.g., a value of 0 indicate that no EPS fallback is performed and a value of 1 indicates that an EPS fallback is performed.
  • the EPS fallback indication is used to trigger a return to a 5GS of the UE 104 after an IMS voice session is completed.
  • the source-to-target container further comprises a second IE, wherein the second IE comprises a 5G Public Land Mobile Network (PLMN) Identifier (ID) .
  • PLMN Public Land Mobile Network
  • ID 5G Public Land Mobile Network
  • the 5G PLMN ID in the EPS fallback indication is used to locate a neighboring cell of an NG-RAN within the 5G PLMN.
  • the method 200 continues with operation 204 in which a second message is transmitted from the first CN 108-1 to the second CN 108-2 according to some embodiments.
  • the second message is a Forward Relocation message.
  • the second message is transmitted from the AMF of the first CN 108-1 to a MME of the second CN 108-2.
  • the second message further comprises the source to target transparent container.
  • the method 200 continues with operation 206 in which a third message is received by the second BS 102-2 from the second CN 108-2 according to some embodiments.
  • the third message is a Handover Request message.
  • the third message comprises the source to target transparent container.
  • the method 200 continues with operation 208 in which an IMS voice session is established according to some embodiments.
  • a PGW of the second CN 108-2 transmits a Create Bearer Request message to the MME through a SGW of the second CN 108-2.
  • the MME of the second CN 108-2 further transmits a Bearer Setup Request message to the second BS 102-2.
  • an IMS network (not shown) continues an IMS voice session establishment for the UE 104.
  • the EPC notifies the IMS network.
  • the NF entity of the IMS network i.e., Proxy-Call Session Control Function (P-CSCF) , continues sending IMS signaling to establish the IMS voice session.
  • P-CSCF Proxy-Call Session Control Function
  • the method 200 continues with operation 210 in which a fourth message is received by the second BS 102-2 from the second CN 108-2 according to some embodiments.
  • the fourth message is received from the MME of the second CN 108-2.
  • the fourth message is a Deactivate Bearer Request message so as to delete the dedicated bearer for the IMS voice session.
  • a Quality of Service Class Identifier (QCI) of the dedicated bearer is 1.
  • the method 200 continues with operation 212A in which a fifth message is transmitted by the second BS 102-2 to the second CN 108-2 according to some embodiments.
  • the fifth message is a Handover Required message so as to initiate a second handover procedure, through which the UE 104 is returned from the second BS 102-2 to a 5GS, according to at least one of the following: the EPS fallback indication and the 5G PLMN ID.
  • the UE 104 accesses a third BS (not shown) , wherein the third BS is an NG-RAN within the 5GS which is identified by the 5G PLMN ID.
  • the third BS is the same as the first BS 102-1.
  • the third BS 102-3 is different from the first BS 102-1.
  • the method 200 continues with operation 212B in which a fifth message is transmitted from the second BS 102-2 to the UE 104 according to some embodiments.
  • the fifth message is a Radio Resource Control (RRC) Release message with redirection information so as to initiate an RRC release procedure, through which BS 102-2 initiates RRC release with redirection, according to at least one of the following: the EPS fallback indication and the 5G PLMN ID.
  • the fifth message comprises redirection information to return the UE 104 to the 5GS.
  • the UE 104 access a third BS (not shown) , wherein the third BS is an NG-RAN within the 5GS which is identified by the 5G PLMN ID.
  • the third BS is the same as the first BS 102-1.
  • the third BS 102-3 is different from the first BS 102-1.
  • the method 200 continues with operation 214 in which the UE access the 5GS according to prior art.
  • the fifth message is a Handover Required message
  • the second BS 102-2 transmits a Handover Command to the UE 104
  • the UE 104 accesses the third BS on radio resources reserved by the third BS.
  • the fifth message is a Radio Resource Control (RRC) Release message
  • the UE 104 accesses the third BS according to the redirection information in the fifth message.
  • RRC Radio Resource Control
  • FIG. 3 illustrates a method 300 for performing a fast returning of a UE 104 to a 5GS, in accordance with some embodiments of the present disclosure. It is understood that additional operations may be provided before, during, and after the method 300 of Figure 3, and that some operations may be omitted or reordered.
  • the communication system in the illustrated embodiment comprises a first BS 102-1, second BS 102-2, a third BS 102-3, a first CN 108-1, a second CN 108-2, and a UE 104.
  • the second CN 108-2 comprises a first NF 302-1 and a second NF 302-2, wherein the first NF 302-1 and the second NF 302-2 each is a MME.
  • the UE 104 is in one of at least one serving cell covered by one of the following: the first BS 102-1, the second BS 102-2, and the third BS 102-3, i.e., the UE 104 is in connection with one of the following: the first BS 102-1, the second BS 102-2, and the third BS 102-3.
  • the first BS 102-1 is a NG-RAN and the first CN 108-1 is a 5GC
  • the second BS 102-2 and the third BS 102-3 each is a 4G RAN (i.e., eNB)
  • the second CN 108-2 is an EPS.
  • the UE 104 can be moved from the second BS 102-2 to the third BS 102-3 during an intra-RAT handover.
  • Figure 3 is for illustration purposes and is not intend to be limiting. It should be noted that that any numbers of BS 102 can be used, which is within the scope of this invention.
  • the method 300 starts with operation 312 in which a first message is transmitted from the first BS 102-1 to the first CN 108-1 according to some embodiments.
  • the first message transmitted by the first BS 102-1 is a handover request message.
  • the first message is received by an AMF of the first CN 108-1.
  • the first message comprises a first information entity (IE) for an EPS fallback indication and in some embodiments, the first IE is within a source-to-target transparent container.
  • IE information entity
  • the first IE for the EPS fallback indication is a binary value, e.g., a value of 0 indicate that no EPS fallback is performed and a value of 1 indicates that an EPS fallback is performed.
  • the EPS fallback indication is used to trigger a return to a 5GS for the UE 104 after an IMS voice session is completed.
  • the source-to-target transparent container further comprises a second IE, wherein the second IE comprises a 5G Public Land Mobile Network (PLMN) Identifier (ID) .
  • PLMN Public Land Mobile Network
  • ID 5G Public Land Mobile Network
  • the 5G PLMN ID in the EPS fallback indication is used to locate a neighboring cell of an NG-RAN within the 5G PLMN.
  • the method 300 continues with operation 314 in which a second message is transmitted from the first CN 108-1 to the second CN 108-2 according to some embodiments.
  • the second message is a Forward Relocation message.
  • the second message is transmitted from the AMF of the first CN 108-1 to the first NF 302-1 of the second CN 108-2.
  • the second message further comprises the source to target transparent container.
  • the method 300 continues with operation 316 in which a third message is received by the second BS 102-2 from the first NF 302-1 of the second CN 108-2 according to some embodiments.
  • the third message is a Handover Request message.
  • the third message comprises the source-to-target transparent container.
  • the method 300 continues with operation 318 in which an IMS voice session is established according to some embodiments.
  • a PGW (not shown) of the second CN 108-2 transmits a Create Bearer Request message to the first NF 302-1 (i.e., MME) through a SGW (not shown) of the second CN 108-2.
  • the first NF 302-1 of the second CN 108-2 further transmits a Bearer Setup Request message to the second BS 102-2.
  • an IMS network (not shown) continues IMS voice session establishment for the UE 104.
  • the EPS notifies the IMS network.
  • An NF entity of the IMS network i.e., Proxy-Call Session Control Function (P-CSCF) , continues sending IMS signaling to establish the IMS voice session.
  • P-CSCF Proxy-Call Session Control Function
  • the method 300 continues with operation 320 in which a fourth message is transmitted from the second BS 102-2 to the first NF 302-1 of the second CN 108-2 according to some embodiments.
  • the fourth message is a Handover Request message, when the second BS 102-2 initiates a second handover procedure.
  • the fourth message comprises the source-to-target transparent container.
  • the method 300 continues with operation 322 in which a fifth message is transmitted from the first NF 302-1 of the second CN 108-2 to the second NF 302-2 of the second CN 108-2 according to some embodiments.
  • the fifth message is a Forward Relocation Request message.
  • the fifth message comprises the source-to-target transparent container.
  • the operation 322 is optional.
  • the method 300 continues with operation 324 in which a sixth message is transmitted from the second NF 302-2 of the second CN 108-2 to the third BS 102-3 according to some embodiments.
  • the sixth message is a Handover Request message.
  • the sixth message comprises the source-to-target transparent container.
  • the method 300 continues with operation 326 in which a seventh message is received by the third BS 102-3 from the second NF 302-2 of the second CN 108-2 according to some embodiments.
  • the seventh message is a Deactivate Bearer Request so as to delete the dedicated bearer for the IMS voice session.
  • a Quality of Service Class Identifier (QCI) of the dedicated bearer is 1.
  • the method 300 continues with operation 328A in which an eighth message is transmitted by the third BS 102-3 to the second NF 302-2 of the second CN 108-2 according to some embodiments.
  • the eighth message is Handover required message so as to initiate a third handover procedure, through which the UE 104 is returned from the third BS 102-3 to a 5GS, according to at least one of the following in the source-to-target container: the EPS fallback indication and the 5G PLMN ID.
  • the UE 104 is handed over to a fourth BS (not shown) , wherein the fourth BS is a NG-RAN within the 5G PLMN.
  • the fourth BS is the same as the first BS 102-1.
  • the fourth BS 102-3 is different from the first BS 102-1.
  • the method 300 continues with operation 328B in which an eighth message is transmitted from the third BS 102-3 to the UE 104 according to some embodiments.
  • the eighth message is a Radio Resource Control (RRC) Release message so as to initiate an RRC release procedure, through which BS 102-2 initiates RRC release with redirection, according to at least one of the following: the EPS fallback indication and the 5G PLMN ID.
  • the eighth message comprises redirection information to return the UE 104 to the 5GS.
  • the UE 104 accesses a fourth BS (not shown) , wherein the fourth BS is a NG-RAN within the 5G PLMN.
  • the fourth BS is the same as the first BS 102-1. In some other embodiments, the fourth BS is different from the first BS 102-1.
  • the method 300 continues with operation 330 in which the UE 104 accesses the 5GS according to prior art.
  • the eighth message is a Handover Required message
  • the second BS 102-2 transmits a Handover Command to the UE 104
  • the UE 104 accesses the fourth BS on radio resources reserved by the fourth BS for the UE 104.
  • the eighth message is a Radio Resource Control (RRC) Release message
  • the UE 104 accesses the fourth BS according to the redirection information in the eighth message.
  • RRC Radio Resource Control
  • Figure 4 illustrates a method 400 for performing a fast returning of a UE 104 to a 5GS, in accordance with some embodiments of the present disclosure. It is understood that additional operations may be provided before, during, and after the method 400 of Figure 4, and that some operations may be omitted or reordered.
  • the communication system in the illustrated embodiment comprises a first BS 102, second BS 102-2, a third BS 102-3, a first CN 108-1, a second CN 108-2, and a UE 104.
  • the second CN 108-2 comprises a first NF 302-1 and a second NF 302-2, wherein the first NF 302-1 and the second NF 302-2 each is a MME.
  • the UE 104 is in one of at least one serving cell covered by one of the following: the first BS 102-1, the second BS 102-2, and the third BS 102-3, i.e., the UE 104 is in connection with one of the following: the first BS 102-1, the second BS 102-2, and the third BS 102-3.
  • the first BS 102-1 is a NG-RAN and the first CN 108-1 is a 5GC
  • the second BS 102-2 and the third BS 102-3 each is a 4G RAN (i.e., eNB)
  • the second CN 108-2 is an EPS.
  • the UE 104 can be moved from the second BS 102-2 to the third BS 102-3 during an intra-RAT handover.
  • Figure 4 is for illustration purposes and is not intend to be limiting. It should be noted that that any numbers of BS 102 can be used, which is within the scope of this invention.
  • the method 400 starts with operation 402 in which a first message is transmitted from the first BS 102-1 to the first CN 108-1 according to some embodiments.
  • the first message transmitted by the first BS 102-1 is a handover request message.
  • the first message is received by an AMF of the first CN 108-1.
  • the first message comprises a first information entity (IE) for an EPS fallback indication and in some embodiments, the first IE is within a source-to-target transparent container.
  • IE information entity
  • the first IE for the EPS fallback indication is a binary value, e.g., a value of 0 indicate that no EPS fallback is performed and a value of 1 indicates that an EPS fallback is performed.
  • the EPS fallback indication is used to trigger a return to a 5GS for the UE 104 after an IMS voice session is completed.
  • the source-to-target transparent container in the first message further comprises a second IE, wherein the second IE comprises a 5G Public Land Mobile Network (PLMN) Identifier (ID) .
  • PLMN Public Land Mobile Network
  • ID 5G Public Land Mobile Network
  • the 5G PLMN ID in the EPS fallback indication is used to locate a neighboring cell of an NG-RAN within the 5G PLMN.
  • the method 400 continues with operation 404 in which a second message is transmitted from the first CN 108-1 to the second CN 108-2 according to some embodiments.
  • the second message is a Forward Relocation message.
  • the second message is transmitted from the AMF of the first CN 108-1 to the first NF 302-1 of the second CN 108-2.
  • the second message further comprises the source-to-target transparent container.
  • the method 400 continues with operation 406 in which a third message is received by the second BS 102-2 from the first NF 302-1 of the second CN 108-2 according to some embodiments.
  • the third message is a Handover Request message.
  • the third message comprises the source-to-target transparent container.
  • the method 400 continues with operation 408 in which an IMS voice session is established according to some embodiments.
  • a PGW (not shown) of the second CN 108-2 transmits a Create Bearer Request message to the first NF 302-1 (i.e., MME) through a SGW (not shown) of the second CN 108-2.
  • the first NF 302-1 of the second CN 108-2 further transmits a Bearer Setup Request message to the second BS 102-2.
  • an IMS network (not shown) continues IMS voice session establishment for the UE 104.
  • the EPS notifies the IMS network.
  • An NF entity of the IMS network i.e., Proxy-Call Session Control Function (P-CSCF) , continues sending IMS signaling to establish the IMS voice session.
  • P-CSCF Proxy-Call Session Control Function
  • the method 400 continues with operation 410 in which a fourth message is transmitted from the second BS 102-2 to the third BS 102-3 according to some embodiments.
  • the fourth message is a Handover Request message, when the second BS 102-2 initiates a second handover procedure.
  • the fourth message is transmitted through an X2 interface.
  • the fourth message further comprises the source-to-target transparent container.
  • the method 400 continues with operation 412 in which a fifth message is received by the third BS 102-3 from the second NF 302-2 of the second CN 108-2 according to some embodiments.
  • the seventh message is a Deactivate Bearer Request so as to delete the dedicated bearer for the IMS voice session.
  • a Quality of Service Class Identifier (QCI) of the dedicated bearer is 1.
  • the method 400 continues with operation 414A in which a sixth message is transmitted by the third BS 102-3 to the second NF 302-2 of the second CN 108-2 according to some embodiments.
  • the eighth message is Handover required message so as to initiate a third handover procedure, through which BS 102-2 initiates RRC release with redirection, according to at least one of the following in the source-to-target transparent container: the EPS fallback indication and the 5G PLMN ID.
  • the eighth message comprises redirection information to return the UE 104 to the 5GS.
  • the UE 104 accesses a fourth BS (not shown) , wherein the fourth BS is a NG-RAN within the 5G PLMN.
  • the fourth BS is the same as the first BS 102-1. In some other embodiments, the fourth BS is different from the first BS 102-1.
  • the method 400 continues with operation 414B in which a sixth message is transmitted from the third BS 102-3 to the UE 104 according to some embodiments.
  • the eighth message is a Radio Resource Control (RRC) Release message so as to initiate an RRC release procedure, through which the UE 104 is returned from the third BS 102-2 to a 5GS, according to at least one of the following: the EPS fallback indication and the 5G PLMN ID.
  • the eighth message comprises redirection information to return the UE 104 to the 5GS.
  • RRC Radio Resource Control
  • the UE 104 locates a fourth BS (not shown) , wherein the fourth BS is a neighboring NG-RAN of the UE 104 with the 5G PLMN ID.
  • the fourth BS is the same as the first BS 102-1. In some other embodiments, the fourth BS is different from the first BS 102-1.
  • the method 400 continues with operation 416 in which the UE 104 accesses the 5GS according to prior art.
  • the eighth message is a Handover Required message
  • the second BS 102-2 transmits a Handover Command to the UE 104
  • the UE 104 accesses the fourth BS on radio resources reserved by the fourth BS for the UE 104.
  • the eighth message is a Radio Resource Control (RRC) Release message
  • the UE 104 accesses the fourth BS according to the redirection information in the eighth message.
  • RRC Radio Resource Control
  • FIG. 5 illustrates a method 500 for performing a fast returning of a UE 104 to a 5GS, in accordance with some embodiments of the present disclosure. It is understood that additional operations may be provided before, during, and after the method 500 of Figure 5, and that some operations may be omitted or reordered.
  • the communication system in the illustrated embodiment comprises a first BS 102-1, a second BS 102-2, a first CN 108-1, a second CN 108-2, and a UE 104.
  • the second CN 108-2 further comprises a plurality of network function (NF) entities, including a first NF 502-1, a second NF 502-2, and a third NF 502-3.
  • NF network function
  • the first NF 502-1 is at least one of the following: a PGW-C and a PGW-U; the second NF 502-2 is a SGW; and the third NF 502-3 is a MME.
  • the first CN 108-1 comprises a plurality of NF entities, including the first NF 502-1, and a fourth NF 502-4.
  • the first NF 502-1 is a combo-node supporting network functions of the first CN 108-1 and the second CN 108-2.
  • the first NF 502-1 is one of the following: a first combo-node with the SMF of the first CN 108-1 and the PGW-C of the second CN 108-2, and a second combo-node with the UPF of the first CN 108-1 and the PGW-U of the second CN 108-2.
  • the fourth NF 502-4 is an AMF of the first CN 108-1.
  • the UE 104 is in one of at least one serving cell covered by one of the following: the first BS 102-1 and the second BS 102-2, i.e., the UE 104 is in connection with one of the following the first BS 102-1 and the second BS 102-2.
  • the first BS 102-1 is a NG-RAN and the first CN 108-1 is a 5GC
  • the second BS 102-2 is a 4G RAN (i.e., eNB)
  • the second CN 108-2 is an EPS.
  • Figure 5 is for illustration purposes and is not intend to be limiting. It should be noted that that any numbers of BS 102 can be used, which is within the scope of this invention.
  • the method 500 starts with operation 512 in which a first message is received by the first CN 108-1 from the first BS 104-1 according to some embodiments.
  • the first message is received by the fourth NF 502-4 of the first CN 108-1.
  • the first message is an N2 Protocol Data Unit (PDU) Session Acknowledgement message.
  • the first message further comprises a first information entity (IE) for an EPS fallback indication.
  • the EPS fallback indication is used to trigger a return to a 5GS of the UE 104 after an IMS voice session is completed.
  • the method 500 continues with operation 514 in which a second message is transmitted from the fourth NF 502-4 to the first NF 502-1 of the first CN 108-1 according to some embodiments.
  • the second message is Nsmf_PDUSession_UpdateSMContext service operation so as to inform the first NF 502-1 of the first CN 108-1 about rejection of the PDU session modification to setup a QoS flow for the IMS voice session with an indication that mobility due to the EPS fallback for the IMS voice session.
  • the method 500 starts with operation 516 in which a third message is transmitted in the second CN 108-2 from the first NF 502-1 to the second NF 502-2 according to some embodiments.
  • the operation 516 is performed after the EPS fallback, when a dedicated bearer for an IMS voice session is initiated by the first NF 502-1.
  • the first message is a Create Bearer Request message.
  • the third message further comprises the first IE for the EPS fallback indication.
  • the third message further comprises the second IE with the 5G PLMN ID.
  • the operation 516 is performed after the EPS fallback, when a dedicated bearer for an IMS voice session is deleted by the first NF 402-1.
  • the third message is a Delete Bearer Request message.
  • the third message further comprises the first IE for the EPS fallback indication.
  • the third message further comprises the second IE with the 5G PLMN ID.
  • the method 500 continues with operation 518 in which a fourth message is transmitted in the second CN 102-2 from the second NF 502-2 to the third NF 502-3 according to some embodiments.
  • the fourth message is a Delete Bearer Request message, when the third message is a Delete Bearer Request message.
  • the fourth message is a Create Bearer Request message, when the third message is a Create Bearer Request message.
  • the fourth message further comprises the first IE for the EPS fallback indication received from the first NF 502-1.
  • the fourth message further comprises the second IE with the 5G PLMN ID.
  • the fourth message further comprises the information of the dedicated bearer for the IMS voice session.
  • the method 500 continues with operation 520 in which a fifth message is received by the second BS 102-2 from the second CN 108-2 according to some embodiments.
  • the fifth message is received by the second BS 102-2 from the third NF 502-3 of the second CN 108-2.
  • the fifth message is a Bearer Setup Request message.
  • the fifth message comprises the information of the dedicated bearer so as to establish the dedicated bearer for the IMS voice session by the second BS 102-2.
  • the method 500 continues with operation 522 in which an IMS voice session is established according to some embodiments.
  • the first NF 502-1 of the second CN 108-2 transmits a Create Bearer Request message to the third NF 502-3 through the second NF 502-2 of the second CN 108-2.
  • the third NF 502-3 of the second CN 108-2 further transmits a Bearer Setup Request message to the second BS 102-2.
  • an IMS in the application layer transmits a signaling to the UE 104 to continue the establishment of the voice session.
  • the method 500 continues with operation 522 followed by operation 524 in which a sixth message is received by the second BS 102-2 from the second CN 108-2 according to some embodiments.
  • the sixth message is a Deactivate Bearer Request message so as to delete the dedicated bearer for the IMS voice session.
  • the sixth message comprises the first IE for the EPS fallback indication.
  • the sixth message further comprises the second IE with the 5G PLMN ID.
  • the sixth message is received by the second BS 102-2 from the third NF 402-3 of the second CN 108-2.
  • the method 500 continues with operation 526A in which a seventh message is transmitted by the second BS 102-2 to the second CN 108-2 according to some embodiments.
  • the seventh message is a Handover Required message so as to initiate a handover procedure, through which the UE 104 is returned from the second BS 102-2 to a 5GS, according to the EPS fallback indication.
  • the UE 104 is handed over to a third BS (not shown) , wherein the third BS is a NG-RAN within the 5G PLMN.
  • the third BS is the same as the first BS 102-1.
  • the third BS 102-3 is different from the first BS 102-1.
  • the fourth BS when an intra-system handover takes place (i.e., a handover from the second BS 102-2 to a fourth BS) before the IMS voice session is completed, the fourth BS (not shown) , which is an eNB, can obtain the EPS fallback indication from a corresponding NF of the second NF 108-2. In this case, the operation 526A is then transmitted from the fourth BS.
  • the method 500 continues with operation 526B in which a seventh message is transmitted from the second BS 102-2 to the UE 104 according to some embodiments.
  • the fifth message is a Radio Resource Control (RRC) Release message so as to initiate an RRC release procedure, through which the UE 104 is returned from the second BS 102-2 to a 5GS, according to at least one of the following: the EPS fallback indication.
  • the seventh message comprises redirection information.
  • the redirection information in the seventh message comprises frequency information of at least one cell of at least one NG-RAN of the 5GS, which can be further used by the UE 104 to scan and access the at least one cell according to the frequency information..
  • the seventh message comprises redirection information to return the UE 104 to the 5GS.
  • the UE 104 accesses a third BS (not shown) , wherein the third BS is a NG-RAN within the 5G PLMN.
  • the third BS is the same as the first BS 102-1.
  • the third BS 102-3 is different from the first BS 102-1.
  • the fourth BS when an intra-system handover takes place (i.e., a handover from the second BS 102-2 to a fourth BS) before the IMS voice session is completed, the fourth BS (not shown) , which is an eNB, can obtain the EPS fallback indication from a corresponding NF (i.e., MME) of the second NF 108-2. In this case, the operation 526B is then transmitted from the fourth BS.
  • a NF i.e., MME
  • the method 500 continues with operation 528 in which the UE 104 accesses the 5GS according to some embodiments.
  • the seventh message is a Handover Required message
  • the second BS 102-2 transmits a Handover Command to the UE 104
  • the UE 104 accesses the fourth BS on radio resources reserved by the fourth BS for the UE 104.
  • the seventh message is a Radio Resource Control (RRC) Release message
  • the UE 104 accesses the fourth BS according to the redirection information in the seventh message.
  • RRC Radio Resource Control
  • any reference to an element herein using a designation such as “first, “ “second, “ and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
  • any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two, which can be designed using source coding or some other technique) , various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software” or a "software module) , or combinations of both.
  • software or a “software module”
  • IC integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the logical blocks, modules, and circuits can further include antennas and/or transceivers to communicate with various components within the network or within the device.
  • a general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine.
  • a processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
  • Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another.
  • a storage media can be any available media that can be accessed by a computer.
  • such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • module refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the invention.
  • memory or other storage may be employed in embodiments of the invention.
  • memory or other storage may be employed in embodiments of the invention.
  • any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the invention.
  • functionality illustrated to be performed by separate processing logic elements, or controllers may be performed by the same processing logic element, or controller.
  • references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé et un appareil de retour rapide à la 5G après un processus de repli EPS. Dans un mode de réalisation, un procédé pour effectuer un retour rapide à 5G par un premier nœud de communication sans fil d'un premier système de communication sans fil, comprend les étapes consistant à : recevoir un premier message provenant d'un premier réseau central du premier système de communication sans fil; et renvoyer un dispositif de communication sans fil à un second système de communication sans fil selon le premier message, le premier message comprenant une indication de repli de système de paquet évolué (Evolved Packet System, EPS).
PCT/CN2019/078482 2019-03-18 2019-03-18 Procédé et appareil de retour rapide à 5gs après un repli eps WO2020186422A1 (fr)

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PCT/CN2019/078482 WO2020186422A1 (fr) 2019-03-18 2019-03-18 Procédé et appareil de retour rapide à 5gs après un repli eps

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Citations (2)

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US20180132141A1 (en) * 2016-11-09 2018-05-10 Mediatek Inc. Enhanced Multimedia Call Control in Next Generation Mobile Communication Systems
WO2018231813A1 (fr) * 2017-06-13 2018-12-20 Intel IP Corporation Systèmes, procédés et dispositifs de reprise d'un système existant dans un système de communication sans fil

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US10805168B2 (en) * 2016-07-29 2020-10-13 Lg Electronics Inc. Method and apparatus for performing cell specific procedure or mobility procedure for network slice-based NR in wireless communication system

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Publication number Priority date Publication date Assignee Title
US20180132141A1 (en) * 2016-11-09 2018-05-10 Mediatek Inc. Enhanced Multimedia Call Control in Next Generation Mobile Communication Systems
WO2018231813A1 (fr) * 2017-06-13 2018-12-20 Intel IP Corporation Systèmes, procédés et dispositifs de reprise d'un système existant dans un système de communication sans fil

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