WO2021237553A1 - Enregistrement de service vocal dans un réseau de communication sans fil - Google Patents

Enregistrement de service vocal dans un réseau de communication sans fil Download PDF

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Publication number
WO2021237553A1
WO2021237553A1 PCT/CN2020/092815 CN2020092815W WO2021237553A1 WO 2021237553 A1 WO2021237553 A1 WO 2021237553A1 CN 2020092815 W CN2020092815 W CN 2020092815W WO 2021237553 A1 WO2021237553 A1 WO 2021237553A1
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WO
WIPO (PCT)
Prior art keywords
service
ims
wireless communication
vops
core network
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PCT/CN2020/092815
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English (en)
Inventor
Dongsheng Wang
Chaofeng HUI
Guojing LIU
Xiaomeng Lu
Xuesong Chen
Liang Xue
Bing LENG
Jian Li
Zongyou XIA
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Qualcomm Incorporated
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Priority to PCT/CN2020/092815 priority Critical patent/WO2021237553A1/fr
Publication of WO2021237553A1 publication Critical patent/WO2021237553A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1073—Registration or de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer

Definitions

  • aspects of the present disclosure generally relate to wireless communication and a voice service registration in a wireless communication network.
  • Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (for example, time, frequency, and power) .
  • a wireless communication system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • Different base stations or network access nodes may implement different radio access technologies (RATs) .
  • RATs radio access technologies
  • 4G fourth-generation
  • LTE-A LTE-Advanced
  • LTE-A Pro LTE-A Pro
  • 5G New Radio
  • NR which also may be referred to as 5G for brevity, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • Wireless communication technologies are evolving to make more use of voice of internet protocol (VoIP) .
  • Deployments of IP multimedia subsystems (IMS) networks are enabling more efficient use of bandwidth, more features, and more reliable handover techniques.
  • Legacy wireless voice service such as those commonly deployed on second-generation (2G) systems and third-generation (3G) systems, is being replaced with IMS voice over packet system (VoPS) service in the 4G and 5G systems.
  • VoIP IMS voice over packet system
  • the UE may revert to the legacy wireless voice service when sending a mobile-originated call or receiving a mobile-terminated call.
  • the method may include establishing at least a first radio connection to a first radio access network (RAN) of a wireless communication system.
  • the method may include sending, via the first radio connection, an attach request message to establish a default packet bearer with a core network of the wireless communication system.
  • the method may include receiving an attach accept message in response to the attach request message.
  • the method may include determining that the attach accept message fails to indicate whether or not the core network supports an IP multimedia subsystem (IMS) voice over packet system (VoPS) service.
  • IMS IP multimedia subsystem
  • VoIP voice over packet system
  • the method may include sending, via the default packet bearer, a voice service registration message to an IMS server of the wireless communication system to attempt a registration to the IMS VoPS service in response to a determination that the attach accept message fails to indicate whether or not the core network supports the IMS VoPS service.
  • determining that the attach accept message fails to indicate whether or not the core network supports the IMS VoPS service may include determining that the attach accept message does not include an information element that would otherwise indicate whether or not the core network supports the IMS VoPS service.
  • the information element is an Evolved Packet System (EPS) network feature support (eps_netwk_feature_support) information element.
  • EPS Evolved Packet System
  • the voice service registration message is a session initiation protocol (SIP) register message directed to the IMS server in an IMS network that provides the IMS VoPS service.
  • SIP session initiation protocol
  • the first radio connection is established to a Long Term Evolution (LTE) RAN.
  • the method may include establishing a second radio connection to a 5G New Radio (NR) RAN of the wireless communication system.
  • the IMS VoPS service may enable the UE to maintain the second radio connection to the 5G NR RAN during a voice call and without the registration to IMS VoPS service the UE would otherwise be required to fall back to a legacy call service for the voice call on a legacy RAN.
  • the method may include receiving a voice service response message from the IMS server indicative that the UE has successfully registered with the IMS VoPS service.
  • the method may include sending a mobile originated call or receiving a mobile terminated call via the IMS VoPS service.
  • the method may include determining that the voice service registration message fails to register with the IMS VoPS service.
  • the method may include utilizing a legacy call service on a legacy RAN for a mobile originated call or a mobile terminated call. Utilizing the legacy call service may include disconnecting the first radio connection and establishing a traditional radio connection to the legacy RAN of the wireless communication system.
  • the first RAN is a Long Term Evolution (LTE) RAN
  • the core network is an Evolved packet core (EPC) network
  • the IMS VoPS service is a voice over LTE (VoLTE) service.
  • LTE Long Term Evolution
  • EPC Evolved packet core
  • VoLTE voice over LTE
  • the UE may include an interface and a processor configured to perform any one of the above-mentioned methods.
  • Another innovative aspect of the subject matter described in this disclosure can be implemented as a computer-readable medium having stored therein instructions which, when executed by a processor, causes the processor to perform any one of the above-mentioned methods.
  • Figure 1 shows a pictorial diagram conceptually illustrating an example of a wireless network.
  • Figure 2 shows a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless network.
  • UE user equipment
  • FIG. 3 shows a block diagram conceptually illustrating an example of a wireless communication system that supports an IP multimedia subsystem (IMS) voice over packet system (VoPS) service.
  • IMS IP multimedia subsystem
  • VoIP voice over packet system
  • FIG. 4 shows a block diagram conceptually illustrating another example of a wireless communication system that supports an IMS VoPS via different radio access technologies (RATs) .
  • RATs radio access technologies
  • Figure 5 shows an example message flow diagram conceptually illustrating an IMS VoPS registration.
  • Figure 6 shows a flowchart illustrating an example process for an IMS VoPS registration.
  • Figure 7 shows a flowchart illustrating a detailed example process for an IMS VoPS registration depending on the contents of an attach accept message.
  • Figure 8 shows a block diagram of an example wireless communication device.
  • the described implementations may be implemented in any device, system or network that is capable of transmitting and receiving radio frequency signals according to any of the wireless communication standards, including any of the IEEE 802.11 standards, the standard, code division multiple access (CDMA) , frequency division multiple access (FDMA) , time division multiple access (TDMA) , Global System for Mobile communications (GSM) , GSM/General Packet Radio Service (GPRS) , Enhanced Data GSM Environment (EDGE) , Terrestrial Trunked Radio (TETRA) , Wideband-CDMA (W-CDMA) , Evolution Data Optimized (EV-DO) , 1xEV-DO, EV-DO Rev A, EV-DO Rev B, High Speed Packet Access (HSPA) , High Speed Downlink Packet Access (HSDPA) , High Speed Uplink Packet Access (HSUPA) , Evolved High Speed Packet Access (HSPA+) , Universal Mobile Telecommunication System (UMTS) , Long Term Evolution (LTE) ,
  • This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for a user equipment (UE) to establish a voice service registration in a wireless communication system.
  • the wireless communication system may fail to indicate whether or not the it supports a packet-based voice call service.
  • the UE may presumptively attempt to register with the packet-based voice call service.
  • the UE may register with the packet-based voice call service even when the wireless communication system does not explicitly indicate that it supports the packet-based voice call service.
  • a wireless communication system may include one or more radio access networks (RANs) , a core network, and gateways to other networks.
  • Each RAN may operate using a particular radio access technology (RAT) .
  • RAT radio access technology
  • Different types of base stations (BSs) may be referred to as a NodeB, an LTE evolved nodeB (eNB) , a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G NodeB, among other examples, depending on the RAT that the base station supports.
  • eNB LTE evolved nodeB
  • AP access point
  • TRP transmit receive point
  • NR New Radio
  • 5G NodeB 5G NodeB
  • one or more LTE base stations may make up an LTE RAN that provides access to the core network of the wireless communication system.
  • the core network may be an Evolved Packet Core (EPC) network or may be a 5G core (5GC) network.
  • EPC Evolved Packet Core
  • 5GC 5G core
  • the UE, the LTE RAN, the EPC and other network services may be collectively referred to as an evolved packet system (EPS) .
  • EPS evolved packet system
  • the examples in this disclosure are based on an EPS or 5G system having an EPC network but also may apply to other system configurations including those with a 5GC or later generations of the core network that support packet-based voice call service.
  • a wireless communication session or association between a UE and a BS of a first RAN may be referred to as a first radio connection (or just a “connection” ) .
  • the UE may setup a default packet bearer via the first radio connection to communicate with the core network.
  • the default packet bearer may be used to communicate with a packet data network and also may be used to set up other bearers to application servers or other services of the wireless communication system.
  • the UE When supported by the UE and the wireless communication system, the UE may establish a non-standalone (NSA) connection in which the first radio connection to a first RAN operates as an anchor radio connection and a second radio connection to a second RAN may be referred to as a secondary radio connection.
  • NSA non-standalone
  • Some legacy RATs such as second-generation (2G) and third-generation (3G) systems may provide a legacy voice call service using a dedicated wireless channel referred to as a circuit-switched (CS) service.
  • Newer RATs such as fourth-generation (4G) and fifth-generation (5G) systems may provide a packet-based multimedia service that includes voice over IP (VoIP) call service.
  • the core network may allow a UE using a 4G RAT or a 5G RAT to register with an IP Multimedia Subsystem (IMS) network that provides an IMS voice over packet system (VoPS) service.
  • IMS IP Multimedia Subsystem
  • VoIP IP Multimedia Subsystem
  • Examples of an IMS VoPS service may include Voice over LTE (VoLTE) .
  • VoLTE Voice over LTE
  • the core network may indicate whether or not the core network enables registration to an IMS VoPS service via a particular RAT. If the core network does not support the IMS VoPS, the UE may use the 4G or 5G RAT for data access and may revert to a legacy RAT for a CS call service whenever it places a mobile-originated voice call or receives a mobile-terminated call.
  • the process of disconnecting the 4G or 5G RAT and connected to the legacy RAT may be referred to as a CS fallback (or CSFB) procedure.
  • the CSFB procedure includes additional steps to establish a radio connection with the legacy RAT.
  • the UE may be necessary for the UE to re-establish radio connections and setup a new default packet bearer when the UE returns to the 4G or 5G RAT after the CSFB call terminates.
  • These additional steps are not necessary when the UE is registered with an IMS VoPS service because the UE may maintain the default packet bearer with the 4G or 5G system during a packet-based voice call. Therefore, it is desirable for the UE to utilize the IMS VoPS service rather than the CSFB procedure for voice calls.
  • the UE may presumptively attempt to register with the IMS VoPS service if the core network fails to explicitly indicate whether or not the it supports the IMS VoPS service.
  • the core network may send an attach accept message to the UE indicating parameters of the core network and default packet bearer.
  • the UE may determine that the attach accept message does not include an information element that would otherwise indicate whether or not the core network supports the IMS VoPS service.
  • the attach accept message may optionally include an EPS network feature support (eps_netwk_feature_support) information element (IE) .
  • the eps_netwk_feature_support IE When included in the attach accept message, the eps_netwk_feature_support IE includes an indicator to indicate whether or not the core network supports the IMS VoPS service. However, when the eps_netwk_feature_support IE is not included in the attach accept message, absent the techniques of this disclosure a traditional UE may not register with the IMS VoPS service and would require CSFB for voice calls.
  • the UE may determine that the eps_netwk_feature_support IE is not included in the attach accept message.
  • the UE may attempt to register with the IMS VoPS service to establish a packet-based voice service registration. For example, the UE may setup an IMS bearer via the core network and send a session initiation protocol (SIP) register message to an IMS server. If the UE receives an acknowledgement from the IMS server in response to the SIP register message, the UE may utilize the IMS VoPS service for packet-based voice calls. Thus, the UE may successfully establish a voice service registration with the wireless communication system. If the UE does not receive an acknowledgement from the IMS server, the UE may determine that the IMS VoPS service is unavailable and may utilize the CSFB procedure for legacy voice call service.
  • SIP session initiation protocol
  • a UE may establish a registration to a packet-based voice service of the wireless communication system rather than require legacy voice call service using CSFB.
  • the packet-based voice service (such as the IMS VoPS service) may provide a better call quality than the legacy voice call service using CSFB.
  • the packet-based voice service may enable the UE to maintain connectivity to a 4G or 5G system (or both) during a packet-based voice call. Absent the techniques of this disclosure, the UE may lose connectivity to the 4G or 5G system whenever the UE performs a CSFB procedure to a legacy RAT.
  • FIG. 1 is a block diagram conceptually illustrating an example of a wireless network 100.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • Wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with UEs and also may be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS, a BS subsystem serving this coverage area, or a combination thereof, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, another type of cell, or a combination thereof.
  • a macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs having association with the femto cell (for example, UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (for example, three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another as well as to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as a direct physical connection, a virtual network, or a combination thereof using any suitable transport network.
  • Wireless network 100 also may include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (for example, a BS or a UE) and send a transmission of the data to a downstream station (for example, a UE or a BS) .
  • a relay station also may be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station also may be referred to as a relay BS, a relay base station, or a relay, among other examples.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, for example, macro BSs, pico BSs, femto BSs, relay BSs, among other examples. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100.
  • macro BSs may have a high transmit power level (for example, 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (for example, 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs also may communicate with one another, for example, directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE also may be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, or a station, among other examples.
  • a UE may be a cellular phone (for example, a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (for example, smart ring, smart bracelet) ) , an entertainment device (for example, a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs.
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, among other examples, that may communicate with a base station, another device (for example, remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (for example, a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices or may be implemented as NB-IoT (narrowband internet of things) devices.
  • Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, similar components, or a combination thereof.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular RAT and may operate on one or more frequencies.
  • a RAT also may be referred to as a radio technology, an air interface, among other examples.
  • a frequency also may be referred to as a carrier, a frequency channel, among other examples.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • access to the air interface may be scheduled, where a scheduling entity (for example, a base station) allocates resources for communication among some or all devices and equipment within the scheduling entity’s service area or cell.
  • a scheduling entity for example, a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (for example, one or more other UEs) . In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, in a mesh network, or another type of network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • P2P peer-to-peer
  • mesh network UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (for example, without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, or similar protocol) , a mesh network, or similar networks, or combinations thereof.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, as well as other operations described elsewhere herein as being performed by the base station 110.
  • FIG 2 is a block diagram conceptually illustrating an example 200 of a base station 110 in communication with a UE 120.
  • the base station 110 and the UE 120 may respectively be one of the base stations and one of the UEs in wireless network 100 of Figure 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (for example, encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs.
  • MCS modulation and coding schemes
  • CQIs channel quality indicators
  • the transmit processor 220 also may process system information (for example, for semi-static resource partitioning information (SRPI) or the like) and control information (for example, CQI requests, grants, upper layer signaling, among other examples. ) and provide overhead symbols and control symbols.
  • SRPI semi-static resource partitioning information
  • the transmit processor 220 also may generate reference symbols for reference signals (for example, the cell-specific reference signal (CRS) ) and synchronization signals (for example, the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (for example, for OFDM) to obtain an output sample stream.
  • Each modulator 232 may further process (for example, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (for example, filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (for example, for OFDM) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (for example, demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller or processor (controller/processor) 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , among other examples.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (for example, for reports including RSRP, RSSI, RSRQ, CQI, among other examples) from controller/processor 280. Transmit processor 264 also may generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (for example, for DFT-s-OFDM, CP-OFDM, among other examples) , and transmitted to base station 110.
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller or processor (i.e., controller/processor) 240.
  • the base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • the network controller 130 may include communication unit 294, a controller or processor (i.e., controller/processor) 290, and memory 292.
  • the controller/processor 240 of base station 110, the controller/processor 280 of UE 120, or any other component (s) of Figure 2 may perform one or more techniques associated with managing measurement gap behavior of the first connection based on an operating attribute of the second connection, as described in more detail elsewhere herein.
  • the controller/processor 280 of UE 120, or any other component (s) (or combinations of components) of Figure 2 may perform or direct operations of, for example, process 600 of Figure 6, process 700 of Figure 7, or other processes as described herein.
  • the memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • the stored program codes when executed by the controller/processor 280 or other processors and modules at UE 120, may cause the UE 120 to perform operations described with respect to process 600 of Figure 6, process 700 of Figure 7, or other processes as described herein.
  • a scheduler 246 may schedule UEs for data transmission on the downlink, the uplink, or a combination thereof.
  • While blocks in Figure 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components.
  • the functions described with respect to the transmit processor 264, the receive processor 258, the TX MIMO processor 266, or another processor may be performed by or under the control of controller/processor 280.
  • Figure 3 shows a block diagram conceptually illustrating an example of a wireless communication system that supports an IMS VoPS service.
  • the example of Figure 3 is based on an EPS 300 that includes a UE 120, an LTE RAN 320, an EPC 330, and an IMS network 340.
  • the LTE RAN 320 may be an evolved universal terrestrial radio access network (E-UTRAN) and is just one example RAT that may be used for an access stratum of the EPS 300.
  • the EPC 330 is just one example of a core network that may be used in the EPS 300.
  • Another example may be a 5GC or a core network based on later generations of the Third Generation Partnership Project (3GPP) or similar standard setting organization.
  • 3GPP Third Generation Partnership Project
  • the UE 120 may establish a radio connection (LTE connection 312) with an eNB 310 of the LTE RAN 320. Once the LTE connection 312 is connected, the UE may setup a default packet bearer 322 to the EPC 330. For example, the UE 120 may send an attach request message to a Mobility Management Entity (MME) 335 in the EPC 330. The MME 335 may respond with an attach accept message that sets up the default packet bearer 322.
  • MME Mobility Management Entity
  • the default packet bearer 322 may be referred to as a default EPS bearer and may be used to communicate with the MME 335 or other elements in the EPC 330.
  • the default packet bearer 322 may be used to setup other bearers or services provided by the EPS 300. For example, the UE may send packet data via the default packet bearer 322 to gateway (not shown) in the EPC 330 that connects to a packet data network.
  • the attach accept message from the MME 335 may optionally include an eps_netwk_feature_support IE to indicate (among other things) whether or not the EPS 300 supports an IMS VoPS service. If the eps_netwk_feature_support IE indicates that the EPS 300 supports the IMS VoPS service, the UE 120 may request the MME 335 to setup a default IMS bearer 332 to the IMS services 345 of the IMS network 340.
  • the IMS services 345 may enable the UE 120 to communicate VoIP calls to or from a remote IMS network 350 or a gateway (not shown) that connects to a public switched telephone network 360.
  • the attach accept message from the MME 335 may not include an eps_netwk_feature_support IE. There may be various reasons the attach accept message from the MME 335 may not include an eps_netwk_feature_support IE, such as a network misconfiguration, a corrupt attach accept message, or a format error, among other examples.
  • the attach accept message does not include the eps_netwk_feature_support IE
  • the UE 120 may interpret the attach accept message as having the eps_netwk_feature_support IE with an IMS VoPS indicator set to zero (indicating that IMS VoPS is not supported) .
  • the EPS 300 may nonetheless actually provide IMS VoPS service.
  • the UE 120 may attempt a registration with the IMS services 345 to determine whether the IMS VoPS service is actually available.
  • FIG. 4 shows a block diagram conceptually illustrating another example of a wireless communication system that supports an IMS VoPS service via different RATs.
  • the EPS 400 in Figure 4 includes the UE 120, the LTE RAN 320, the EPC 330, and the IMS network 340 as described with reference to Figure 3.
  • the EPS 400 also may include a 5G NR RAN 420 capable of establishing a 5G NR connection 412 with the UE 120.
  • the 5G NR RAN 420 may use the same EPC 330 as the LTE RAN 320.
  • the 5G NR RAN 420 may use a 5GC 420 with a 5G Core Access and Mobility Management Function (AMF) that performs similar functionality as the MME 335.
  • the 5GC 420 may connect to an IMS network 340 which may be the same as described with reference to Figure 3.
  • the same IMS network 340 may provide IMS services 345 for the EPC 330, the 5GC 430, or both.
  • AMF 5
  • the LTE RAN 320 and the 5G NR RAN 420 may be used to establish multiple radio connections with the same UE 120.
  • the LTE connection 312 may be a first radio connection and may be referred to as an anchor radio connection.
  • the 5G NR connection 412 may be an NSA connection and may be referred to as a secondary radio connection.
  • the LTE RAN 320 and the 5G NR RAN 420 may communicate with the same core network (EPC 330) .
  • the UE 120 may setup a default EPS bearer with the MME 335 via either or both of the LTE connection 312 and the 5G NR connection 412.
  • the UE 120 may request the MME 335 to setup a default IMS bearer to the IMS services 345 via either or both of the LTE connection 312 and the 5G NR connection 412.
  • the UE 120 may register with the IMS VoPS service (such as at the IMS services 345) via the default IMS bearer.
  • the UE 120 may prefer the IMS VoPS service. Furthermore, if the IMS VoPS service is unavailable, the UE 120 may be required to perform a CSFB procedure to a legacy RAT (not shown) which causes delays and disruption to the various bearers setup in the EPS. Therefore, the UE 120 may presumptively attempt a registration to the IMS services 345 even when the attach accept message from the MME 335 does not explicitly indicate that the IMS VoPS service is supported.
  • FIG. 5 shows an example message flow diagram 500 conceptually illustrating an IMS VoPS registration.
  • the UE 120 may begin by establishing an anchor radio connection with a first RAN of one or more RANs 520.
  • the first RAN may be an LTE RAN.
  • the UE 120 may send radio resource control (RRC) connection setup message 522 to the first RAN and may receive an RRC configuration message 524 from the first RAN.
  • RRC connection setup message 522 and the RRC configuration message 524 are example RRC messages that may be exchanged between the UE 120 the first RAN to establish the anchor radio connection.
  • the UE 120 may send an attach request message 523 via the anchor radio connection to the EPC 530 to setup a default EPS bearer to the EPC 530.
  • the EPC 530 may setup the default EPS bearer and respond with an attach accept message 534.
  • the UE 120 also may establish a secondary radio connection with a second RAN (such as a 5G NR RAN) of the one or more RANs 520.
  • the UE 120 may exchange RRC messages 526 and 528 to establish a secondary radio connection with the second RAN.
  • the UE 120 also may exchange attachment messages with the EPC 530 to establish an EPS bearer with EPC 530 via the second radio connection.
  • the one or more RANs 520 may coordinate to share a default EPS bearer with the EPC 530 among between the anchor radio connection and the secondary radio connection.
  • the UE 120 may process the attach accept message 534 from the EPC 530.
  • the attach accept message 534 does not explicitly indicate whether or not that the EPS supports the IMS VoPS service, or when the attach accept message 534 explicitly indicates that the EPS does support the IMS VoPS service
  • the UE 120 may attempt to register with the IMS network 540.
  • the UE 120 may request the EPC 530 to setup a default IMS bearer between the UE 120 and an IMS network 540 via the anchor radio connection, the secondary radio connection, or both.
  • the UE 120 may send an IMS registration request message 542 (such as a SIP register message) to the IMS network 540 via the default IMS bearer.
  • the IMS network 540 may respond with an IMS registration response 544 indicating an acknowledgement of the IMS registration request message 542.
  • the IMS network 540 may respond with a negative acknowledgement (NAK) or may fail to respond if the IMS network 540 is not supported by the EPC 530.
  • NAK negative acknowledgement
  • FIG 6 shows a flowchart illustrating an example process 600 for an IMS VoPS registration.
  • the operations of process 600 may be implemented by a UE or its components as described herein.
  • the process 600 may be performed by an apparatus such as UE 120 described above with reference to Figures 3-5 or a wireless communication device such as the wireless communication device 800 described with reference to Figure 8.
  • the apparatus may establish at least a first radio connection to a first RAN of a wireless communication system. In some implementations, the apparatus may establish a second radio connection to a second RAN of the wireless communication system.
  • the apparatus may send, via the first radio connection, an attach request message to establish a default packet bearer with a core network of the wireless communication system.
  • the apparatus may receive an attach accept message in response to the attach request message.
  • the apparatus may determine that the attach accept message fails to indicate whether or not the core network supports an IMS VoPS service.
  • the attach accept message may not include an eps_netwk_feature_support IE that would otherwise explicitly indicate whether or not the core network supports the IMS VoPS service.
  • the apparatus may send, via the default packet bearer, a voice service registration message to an IMS server of the wireless communication system to attempt a registration to the IMS VoPS service in response to a determination that the attach accept message fails to indicate whether or not the core network supports the IMS VoPS service.
  • the voice service registration message may be a request to setup an IMS bearer to an IMS network, a SIP register message via the IMS bearer, or both.
  • FIG 7 shows a flowchart illustrating a detailed example process 700 for an IMS VoPS registration depending on the contents of an attach accept message.
  • the operations of process 700 may be implemented by a UE or its components as described herein.
  • the process 700 may be performed by an apparatus such as UE 120 described above with reference to Figures 3-5 or a wireless communication device such as the wireless communication device 800 described with reference to Figure 8.
  • the apparatus may establish an anchor radio connection.
  • the apparatus may setup a bearer to the core network via the anchor radio connection.
  • the core network may send an attach accept message to the apparatus.
  • the apparatus may establish a secondary radio connection.
  • the apparatus may determine whether or not the attach accept message includes the EPS network feature support (eps_network_feature_support) IE. If attach accept message includes the eps_netwk_feature_support IE, the process 700 may proceed to block 750. Otherwise, if the attach accept message does not include the eps_netwk_feature_support IE, the process 700 may proceed to block 760.
  • EPS network feature support eps_network_feature_support
  • the apparatus may determine whether the eps_network_feature_support IE indicates that IMS VoPS service is supported. If the eps_network_feature_support IE indicates that IMS VoPS service is supported, the process 700 may proceed to block 760. Otherwise, the process 700 may proceed to block 790 at which the apparatus may not use the IMS VoPS service.
  • the apparatus may attempt a registration to the IMS VoPS service.
  • the process 700 may proceed to block 780 at which the apparatus may use the IMS VoPS service. Otherwise, the process 700 may proceed to block 790 at which the apparatus may not use the IMS VoPS service.
  • Figure 8 shows a block diagram of an example wireless communication device 800.
  • the wireless communication device 800 can be an example of a device for use in a UE, such as UE 120 described above with reference to Figure 1.
  • the wireless communication device 800 is capable of transmitting (or outputting for transmission) and receiving wireless communications.
  • the wireless communication device 800 can be, or can include, a chip, system on chip (SoC) , chipset, package or device.
  • SoC system-on-chip
  • the term “system-on-chip” (SoC) is used herein to refer to a set of interconnected electronic circuits typically, but not exclusively, including one or more processors, a memory, and a communication interface.
  • the SoC may include a variety of different types of processors and processor cores, such as a general purpose processor, a central processing unit (CPU) , a digital signal processor (DSP) , a graphics processing unit (GPU) , an accelerated processing unit (APU) , a sub-system processor, an auxiliary processor, a single-core processor, and a multicore processor.
  • CPU central processing unit
  • DSP digital signal processor
  • GPU graphics processing unit
  • APU accelerated processing unit
  • the SoC may further include other hardware and hardware combinations, such as a field programmable gate array (FPGA) , a configuration and status register (CSR) , an application-specific integrated circuit (ASIC) , other programmable logic device, discrete gate logic, transistor logic, registers, performance monitoring hardware, watchdog hardware, counters, and time references.
  • SoCs may be integrated circuits (ICs) configured such that the components of the IC reside on the same substrate, such as a single piece of semiconductor material (such as, for example, silicon) .
  • SIP system in a package
  • a SIP may include a single substrate on which multiple IC chips or semiconductor dies are stacked in a vertical configuration.
  • the SIP may include one or more multi-chip modules (MCMs) on which multiple ICs or semiconductor dies are packaged into a unifying substrate.
  • MCMs multi-chip modules
  • a SIP also may include multiple independent SoCs coupled together via high speed communication circuitry and packaged in close proximity, such as on a single motherboard or in a single mobile communication device. The proximity of the SoCs facilitates high speed communications and the sharing of memory and resources.
  • multicore processor is used herein to refer to a single IC chip or chip package that contains two or more independent processing cores (for example a CPU core, IP core, GPU core, among other examples) configured to read and execute program instructions.
  • An SoC may include multiple multicore processors, and each processor in an SoC may be referred to as a core.
  • multiprocessor may be used herein to refer to a system or device that includes two or more processing units configured to read and execute program instructions.
  • the wireless communication device 800 may include one or more modems 802.
  • the one or more modems 802 may include a WWAN modem (for example, a 3GPP 4G LTE or 5G compliant modem) .
  • the wireless communication device 800 also includes one or more radios 804 (collectively “the radio 804” ) .
  • the wireless communication device 800 further includes one or more processors, processing blocks or processing elements 806 (collectively “the processor 806” ) and one or more memory blocks or elements 808 (collectively “the memory 808” ) .
  • the modem 802 can include an intelligent hardware block or device such as, for example, an application-specific integrated circuit (ASIC) among other possibilities.
  • the modem 802 is generally configured to implement a PHY layer.
  • the modem 802 is configured to modulate packets and to output the modulated packets to the radio 804 for transmission over the wireless medium.
  • the modem 802 is similarly configured to obtain modulated packets received by the radio 804 and to demodulate the packets to provide demodulated packets.
  • the modem 802 may further include digital signal processing (DSP) circuitry, automatic gain control (AGC) , a coder, a decoder, a multiplexer and a demultiplexer.
  • DSP digital signal processing
  • AGC automatic gain control
  • data obtained from the processor 806 is provided to a coder, which encodes the data to provide encoded bits.
  • the encoded bits are mapped to points in a modulation constellation (using a selected MCS) to provide modulated symbols.
  • the modulated symbols may be mapped to a number NSS of spatial streams or a number NSTS of space-time streams.
  • the modulated symbols in the respective spatial or space-time streams may be multiplexed, transformed via an inverse fast Fourier transform (IFFT) block, and subsequently provided to the DSP circuitry for Tx windowing and filtering.
  • the digital signals may be provided to a digital-to-analog converter (DAC) .
  • the resultant analog signals may be provided to a frequency upconverter, and ultimately, the radio 804.
  • the modulated symbols in the respective spatial streams are precoded via a steering matrix prior to their provision to the IFFT block.
  • DSP circuitry While in a reception mode, digital signals received from the radio 804 are provided to the DSP circuitry, which is configured to acquire a received signal, for example, by detecting the presence of the signal and estimating the initial timing and frequency offsets.
  • the DSP circuitry is further configured to digitally condition the digital signals, for example, using channel (narrowband) filtering, analog impairment conditioning (such as correcting for I/Q imbalance) , and applying digital gain to ultimately obtain a narrowband signal.
  • the output of the DSP circuitry may be fed to the AGC, which is configured to use information extracted from the digital signals, for example, in one or more received training fields, to determine an appropriate gain.
  • the output of the DSP circuitry also is coupled with the demodulator, which is configured to extract modulated symbols from the signal and, for example, compute the logarithm likelihood ratios (LLRs) for each bit position of each subcarrier in each spatial stream.
  • the demodulator is coupled with the decoder, which may be configured to process the LLRs to provide decoded bits.
  • the decoded bits from all of the spatial streams are fed to the demultiplexer for demultiplexing.
  • the demultiplexed bits may be descrambled and provided to the MAC layer (the processor 806) for processing, evaluation, or interpretation.
  • the radio 804 generally includes at least one radio frequency (RF) transmitter (or “transmitter chain” ) and at least one RF receiver (or “receiver chain” ) , which may be combined into one or more transceivers.
  • the RF transmitters and receivers may include various DSP circuitry including at least one power amplifier (PA) and at least one low-noise amplifier (LNA) , respectively.
  • PA power amplifier
  • LNA low-noise amplifier
  • the RF transmitters and receivers may, in turn, be coupled to one or more antennas.
  • the wireless communication device 800 can include, or be coupled with, multiple transmit antennas (each with a corresponding transmit chain) and multiple receive antennas (each with a corresponding receive chain) .
  • the symbols output from the modem 802 are provided to the radio 804, which transmits the symbols via the coupled antennas.
  • symbols received via the antennas are obtained by the radio 804, which provides the symbols to the modem 802.
  • the processor 806 can include an intelligent hardware block or device such as, for example, a processing core, a processing block, a central processing unit (CPU) , a microprocessor, a microcontroller, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a programmable logic device (PLD) such as a field programmable gate array (FPGA) , discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • the processor 806 processes information received through the radio 804 and the modem 802, and processes information to be output through the modem 802 and the radio 804 for transmission through the wireless medium.
  • the processor 806 may generally control the modem 802 to cause the modem to perform various operations described above.
  • the memory 808 can include tangible storage media such as random-access memory (RAM) or read-only memory (ROM) , or combinations thereof.
  • the memory 808 also can store non-transitory processor-or computer-executable software (SW) code containing instructions that, when executed by the processor 806, cause the processor to perform various operations described herein for wireless communication, including the generation, transmission, reception and interpretation of MPDUs, frames or packets.
  • SW non-transitory processor-or computer-executable software
  • various functions of components disclosed herein, or various blocks or steps of a method, operation, process or algorithm disclosed herein can be implemented as one or more modules of one or more computer programs.
  • Figures 1-8 and the operations described herein are examples meant to aid in understanding example implementations and should not be used to limit the potential implementations or limit the scope of the claims. Some implementations may perform additional operations, fewer operations, operations in parallel or in a different order, and some operations differently.
  • the term “component” is intended to be broadly construed as hardware, firmware, or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, or a combination of hardware and software.
  • the phrase “based on” is intended to be broadly construed to mean “based at least in part on. ”
  • satisfying a threshold may refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, or the like.
  • a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover the possibilities of: a only, b only, c only, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a and b and c.
  • the hardware and data processing apparatus used to implement the various illustrative components, logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single-or multi-chip processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device (PLD) , discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine.
  • a processor also may be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • particular processes, operations and methods may be performed by circuitry that is specific to a given function.
  • implementations of the subject matter described in this specification can be implemented as software.
  • various functions of components disclosed herein, or various blocks or steps of a method, operation, process or algorithm disclosed herein can be implemented as one or more modules of one or more computer programs.
  • Such computer programs can include non-transitory processor-or computer-executable instructions encoded on one or more tangible processor-or computer-readable storage media for execution by, or to control the operation of, data processing apparatus including the components of the devices described herein.
  • storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store program code in the form of instructions or data structures. Combinations of the above should also be included within the scope of storage media.
  • the terms “user equipment” , “wireless communication device” , “mobile communication device” , “communication device” , and/or “mobile device” refer to any one or all of cellular telephones, smartphones, portable computing devices, personal or mobile multi-media players, laptop computers, tablet computers, smartbooks, Internet-of-Things (IoT) devices, palm-top computers, wireless electronic mail receivers, multimedia Internet enabled cellular telephones, wireless gaming controllers, display sub-systems, driver assistance systems, vehicle controllers, vehicle system controllers, vehicle communication system, infotainment systems, vehicle telematics systems or subsystems, vehicle display systems or subsystems, vehicle data controllers or routers, and similar electronic devices which include a programmable processor and memory and circuitry configured to perform operations as described herein.
  • IoT Internet-of-Things
  • SIM Subscriber identification module
  • SIM card Subscriber identification module
  • subscriber identification module refers to a memory that may be an integrated circuit or embedded into a removable card, and that stores an International Mobile Subscriber Identity (IMSI) , related key, and/or other information used to identify and/or authenticate a mobile communication device on a network and enable a communication service with the network.
  • IMSI International Mobile Subscriber Identity
  • SIM subscriber identity
  • SAT SIM application toolkit
  • a SIM card may further store home identifiers (such as, a System Identification Number (SID) /Network Identification Number (NID) pair, a Home Public Land Mobile Number (HPLMN) code, among other examples) to indicate the SIM card network operator provider.
  • SID System Identification Number
  • NID Network Identification Number
  • HPLMN Home Public Land Mobile Number
  • An Integrated Circuit Card Identity (ICCID) SIM serial number may be printed on the SIM card for identification.
  • a SIM may be implemented within a portion of memory of the mobile communication device, and thus need not be a separate or removable circuit, chip or card.
  • drawings may schematically depict one or more example processes in the form of a flowchart or flow diagram. However, other operations that are not depicted can be incorporated in the example processes that are schematically illustrated. For example, one or more additional operations can be performed before, after, simultaneously, or between any of the illustrated operations. In some circumstances, multitasking and parallel processing may be advantageous.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des systèmes, des procédés et un appareil, incluant des programmes d'ordinateur codés sur des supports lisibles par ordinateur, destinés à un équipement d'utilisateur (UE) pour établir un enregistrement de service vocal dans un système de communication sans fil. Le système de communication sans fil peut inclure un ou plusieurs réseaux d'accès radio (RAN), un réseau fédérateur et un réseau de sous-systèmes multimédias IP (IMS). Dans certains déploiements, lorsque le réseau fédérateur établit un support de paquet par défaut pour l'UE, le réseau fédérateur peut ne pas parvenir à indiquer s'il prend en charge un service de système voix sur paquet (VoPS) IMS (par exemple voix sur évolution à long terme, VoLTE). Dans de telles instances, l'UE peut essayer par présomption de s'enregistrer auprès du service VoPS IMS. Cette façon d'agir peut être utile, par exemple, lorsque l'UE a également une connexion radio LTE ainsi qu'une connexion radio 5G Nouvelle Radio (NR) avec un RAN 5G NR du système de communication sans fil.
PCT/CN2020/092815 2020-05-28 2020-05-28 Enregistrement de service vocal dans un réseau de communication sans fil WO2021237553A1 (fr)

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WO2017082996A1 (fr) * 2015-11-10 2017-05-18 Blackberry Limited Sélection de passerelle commandée par réseau
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WO2017082996A1 (fr) * 2015-11-10 2017-05-18 Blackberry Limited Sélection de passerelle commandée par réseau
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