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Communication fallback in 5G systems and methods — T-Mobile Usa, Inc. (US11589271B2)

T-Mobile Usa, Inc. · Google Patents

Google Patents · Patents · License: Open Access

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mobileusa

patent, google patents, intellectual property, US11589271B2, T-Mobile Usa, Inc., Muhammad Tawhidur Rahman, en, 2023

ABSTRACT

Abstract

Systems and methods for performing Evolved Packet System (EPS) fallback from a 5G system to an Evolved Packet Core (EPC) system are disclosed. The method, performed in a mobile device, detects a communication at the mobile device. The method then determines whether either the mobile device or a base station supports the communication over new radio. Directly in response to determining that either one of the mobile device or the base station does not support the communication over new radio, the method generates and transmits an EPS fallback message from the mobile device to the base station, wherein the EPS fallback message instructs the base station to initiate a fallback procedure from the 5G system to the EPC system.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No. 16/372,396, filed Apr. 1, 2019, entitled COMMUNICATION FALLBACK IN 5G SYSTEMS AND METHODS, which is hereby incorporated by reference in its entirety.

BACKGROUND

5G New Radio (NR) is expected to coexist with 4G Long Term Evolution (LTE) both during the initial deployment phase (providing a seamless transition from 4G LTE to 5G NR) and even later when 5G is widely deployed. For example, heterogenous networks (HetNets) providing for E-UTRAN-NR Dual Connectivity (EN-DC) will exist to provide, for example, better in-building connectivity and indoor coverage using user equipment or terminal equipment simultaneously connected to 5G small cell devices and 4G macro base stations or vice-versa. Multiple migration paths and steps exist for migration to 5G. For instance, an initial 5G deployment using option 3-5G Evolved Packet System (EPS) includes NR non-standalone in the Radio Access Network (RAN). 4G voice (VoLTE) and other IP Multimedia System (IMS) services continue to be used without the need for any core network upgrade. At least initially, a 5G system will not be deployed with full network coverage. Therefore, the 5G system will need to be tightly coupled to an existing 4G VoLTE deployment to provide seamless voice services across the whole 4G+5G network.

To accommodate 5G systems using option 2 (3GPP-option 2), the 3rd Generation Partnership Project (3GPP) has published an EPS fallback procedure. The EPS fallback procedure enables phones to use the 5G system with NR before all needed voice features are implemented in a mobile device and in NG-RAN. This is an intermediate step toward supporting in a 5G system voice or other communication, such as video, text, and so on. A mobile device (user device, UE) that tries to establish a voice communication via a NR node will perform an EPS fallback at call setup, triggered by an attempt to establish a Quality-of-Service (QoS) bearer for the voice flow for voice over NT (VoNR). When attempting to establish the QoS bearer for the voice flow over NR during call set-up, the NG-RAN can reject the QoS flow setup towards the 5G system and provide an indication that mobility is in progress. The NG-RAN can then initiate transfer of all sessions from the 5G system to EPS, using either a release with redirect procedure or an inter-system handover procedure. However, the EPS fallback procedure adds significant call setup time, which should be kept as short as possible.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a communication network in which some implementations of the present technology can be utilized.

FIG. 2 is a flow diagram illustrating a set of operations for performing EPS fallback according to various implementations.

FIG. 3 is a flow diagram illustrating a set of operations for initiating EPS fallback according to various implementations.

FIGS. 4 A- 4 B are flow diagrams illustrating a set of operations for performing EPS fallback according to various implementations.

FIG. 5 illustrates an example data structure to store information at a mobile device about various protocols supported by base stations according to various implementations.

FIG. 6 is a diagrammatic representation of a machine in the example form of a computer system within which a set of instructions, for causing the machine to perform any one or more of the methodologies discussed herein, can be executed.

In the drawings, some components and/or operations can be separated into different blocks or combined into a single block for discussion of some of the implementations of the present technology. Moreover, while the technology is amenable to various modifications and alternative forms, specific implementations have been shown by way of example in the drawings and are described in detail below. The intention, however, is not to limit the technology to the particular implementations described. On the contrary, the technology is intended to cover all modifications, equivalents, and alternatives falling within the scope of the technology as defined by the appended claims.

DETAILED DESCRIPTION

Currently, under the 3GPP guidelines, the process to setup a call from a 5G user device (UE) that does not support Voice over New radio (VoNR) takes a long time (e.g., more than 10-12 seconds) and is performed via a set of complex and time-consuming steps. In particular, as per the current 3GPP guidelines, a 5G UE will not invoke the EPS fallback procedure immediately when a user initiates a communication (for example, dials a call). Instead, the 5G UE will first perform multiple signaling steps (costing time and resources) to try to connect to the IMS network via a 5G New Radio (5G NR) before eventually triggering the EPS fallback procedure. Thus, the current process will result in a significant delay in call setup time.

Once telecommunications service providers and UEs start adopting 5G, this long call setup time will result in degraded customer experience. To solve this problem, modified call setup methods and systems that reduce the call setup time in such circumstances are described herein. In particular, a 5G UE that does not support VoNR (3GPP-option 2) will automatically fallback to an LTE radio without first executing multiple signaling steps to try to connect to the IMS network via a 5G NR. Logic in the 5G UE will be enhanced such that when a UE initiates communications (for example, when a user dials a call), instead of immediately sending a SIP INVITE from the 5G UE to the IMS network (via the 5G NR), the 5G UE will automatically trigger the EPS fallback procedure to fallback to LTE by performing reselection to available LTE cell sites. Once the 5G UE has latched onto an LTE cell site, the 5G UE will send a SIP INVITE to the connected LTE cell site and re-establish IMS registration using the LTE cell site (existing VoLTE call flow).

In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of implementations of the present technology. It will be apparent, however, to one skilled in the art that implementations of the present technology can be practiced without some of these specific details. Further, while the following description discusses voice communication (for example, VoLTE, VoNR, and so on), it will be apparent to one skilled in the art that implementations of the present technology can be practiced for other types of communications as well (for example, video, text, and so on).

The techniques introduced here can be implemented as special-purpose hardware (for example, circuitry), as programmable circuitry appropriately programmed with software and/or firmware, or as a combination of special-purpose and programmable circuitry. Hence, implementations can include a machine-readable medium having stored thereon instructions which can be used to program a computer (or other electronic devices) to perform a process. The machine-readable medium can include, but is not limited to, floppy diskettes, optical disks, compact disc read-only memories (CD-ROMs), magneto-optical disks, ROMs, random access memories (RAMs), erasable programmable read-only memories (EPROMs), electrically erasable programmable read-only memories (EEPROMs), magnetic or optical cards, flash memory, or other types of media/machine-readable medium suitable for storing electronic instructions.

The phrases âin some implementations,â âaccording to some implementations,â âin the implementations shown,â âin other implementations,â and the like generally mean the particular feature, structure, or characteristic following the phrase is included in at least one implementation of the present technology and can be included in more than one implementation. In addition, such phrases do not necessarily refer to the same implementations or different implementations.

FIG. 1 illustrates a telecommunications network 10 (also referred to herein as network 10 ) in accordance with various implementations or embodiments. The network 10 comprises a base station (BS) 12 communicatively coupled to multiple user devices, referred to as user equipment (UE) UEs 14 _ 1 , 14 _ 2 , . . . , 14 _N, where N is an integer. The BS 12 serves UEs 14 located within a geographical area, for example, within a macro cell 16 . FIG. 1 illustrates the macro cell 16 to be hexagonal in shape, though this is merely a schematic representation. In general, the network 10 comprises multiple cells 16 , with each cell 16 including one or more BSs 12 (macro cell), 5G transceivers (small cell devices), or a combination of both macro and small cells (HetNets), though many other cell types are possible including cells having one or more femtocells, picocells, IEEE 802.11 access points (WiFi APs). (While FIG. 1 shows a macro cell, the cell 16 need not be so limited, and the term âbase stationâ as used herein likewise encompasses any device to provide a wireless connection between UEs and a larger wired network.) Depending on the configuration and size, the network 10 can represent and serve various regional areas, for example, a city, a state, an entire nation, the whole world, etc.

The UEs 14 _ 1 , . . . , 14 _N comprise any devices for communicating over a wireless communication network. Such devices include mobile telephones, cellular telephones, mobile computers, Personal Digital Assistants (PDAs), radio frequency devices, handheld computers, laptop computers, tablet computers, server computers, client computers, personal computers (PCs), tablet PCs, set-top boxes (âSTBsâ), palmtops, pagers, integrated devices combining one or more of the preceding devices, or any machine capable of executing a set of instructions (sequential or otherwise) that specify actions to be taken by that machine. As such, UEs 14 _ 1 , . . . , 14 _N can range widely in terms of capabilities and features. UEs 14 _ 1 , . . . , 14 _N can include a universal integrated circuit card (UICC) with, e.g. a subscriber identity module (âSIMâ)), but alternatively or additionally can include SIM-less devices (i.e., mobile devices that do not contain a functional SIM), embedded SIM devices (for example, eSIM and/or iSIM devices), roaming mobile devices (i.e., mobile devices operating outside of their home access networks), and/or mobile software applications.

In some implementations, the BS 12 communicates voice traffic and/or data traffic with one or more of the UEs 14 _ 1 , . . . , 14 _N. The BS 12 can communicate with the UEs 14 _ 1 , . . . , 14 _N using one or more communication protocols or standards. For example, the BS 12 communicates with the UEs 14 _ 1 , . . . , 14 _N using one or more standards/protocols, including but not limited to Global System for Mobile Communications (GSM), Internet Protocol (IP) Multimedia Subsystem (IMS), Time Division Multiple Access (TDMA), Universal Mobile Telecommunications System (UMTS), Evolution-Data Optimized (EVDO), Long Term Evolution (LTE), Generic Access Network (GAN), Unlicensed Mobile Access (UMA), Code Division Multiple Access (CDMA) protocols (including IS-95, IS-2000, and IS-856 protocols), Advanced LTE or LTE+, Orthogonal Frequency Division Multiple Access (OFDM), General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), Advanced Mobile Phone System (AMPS), WiMAX protocols (including IEEE 802.16e-2005 and IEEE 802.16m protocols), any of the various IEEE 802.11 standards, High Speed Packet Access (HSPA), (including High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)), Ultra Mobile Broadband (UMB), 5G NR (New Radio), or other communications networks.

The BS 12 can be communicatively coupled (for example, using a backhaul connection, illustrated using solid lines in FIG. 1 ) to backhaul equipment, for example, an operation support subsystem (OSS) server 18 , a radio network controller (RNC) 20 , etc. The RNC 20 can also be in the form of or include a mobility management entity (MME) when the wireless communication network 10 operates according to the long term evolution (LTE) standard or LTE Advanced standard, be in the form of or include an access and management mobility function (AMF) when the wireless communication network 10 operates according to the 5G standard, or both.

As shown in the block diagram, the base station 12 comprises processors 120 , one or more transmit antennas (transmitters) 122 , one or more receive antennas (receivers) 124 , and computer- readable media 126 . The processors 120 are configured to execute instructions, which can be stored in the computer- readable media 126 or in other computer-readable media accessible to the processors 120 . The processors 120 can be a central processing unit (CPU), a graphics processing unit (GPU), or both CPU and GPU, or any other sort of processing unit. In 3GPP RANs in LTE systems, the <figure-callout id="12" label="base station" filenames="US11589271-20230221-D00000.png,U

CROSS-REFERENCE TO RELATED APPLICATION

BACKGROUND

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a communication network in which some implementations of the present technology can be utilized.

FIG. 2 is a flow diagram illustrating a set of operations for performing EPS fallback according to various implementations.

FIG. 3 is a flow diagram illustrating a set of operations for initiating EPS fallback according to various implementations.

FIGS. 4 A- 4 B are flow diagrams illustrating a set of operations for performing EPS fallback according to various implementations.

FIG. 5 illustrates an example data structure to store information at a mobile device about various protocols supported by base stations according to various implementations.

DETAILED DESCRIPTION

As shown in the block diagram, the base station 12 comprises processors 120 , one or more transmit antennas (transmitters) 122 , one or more receive antennas (receivers) 124 , and computer- readable media 126 . The processors 120 are configured to execute instructions, which can be stored in the computer- readable media 126 or in other computer-readable media accessible to the processors 120 . The processors 120 can be a central processing unit (CPU), a graphics processing unit (GPU), or both CPU and GPU, or any other sort of processing unit. In 3GPP RANs in LTE systems, the base station 12 can include a RAN Node such as an Evolved-Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted an eNode B, or eNB) and/or RNC in an E-UTRAN, which communicates with user devices, such as UEs 14 _ 1 , . . . , 14 _N. In 5G wireless RANs, RAN Nodes can include a 5G Node, new radio (NR) or g Node B (gNB).

The one or more transmit antennas 122 transmit signals to the UEs 14 _ 1 , . . . , 14 _N, and the one or more receive antennas 124 receive signals from the UEs 14 _ 1 , . . . , 14 _N. The antennas

122 and 124 include antennas known in the art. For example, antennas

122 and 124 include radio transmitters and radio receivers that perform the function of transmitting and receiving radio frequency communications. The antennas

122 and 124 can be included in a transceiver module of the BS 12 .

The computer- readable media 126 includes computer-readable storage media (âCRSMâ). The CRSM can be any available physical media accessible by a computing device to implement the instructions stored thereon. CRSM can include, but is not limited to, random-access memory (âRAMâ), read-only memory (âROMâ), electrically erasable programmable read-only memory (âEEPROMâ), flash memory or other memory technology, compact disc read-only memory (âCD-ROMâ), digital versatile discs (âDVDâ) or other optical disc storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by the base station 12 . The computer- readable media 126 can reside within the base station 12 , on one or more storage devices accessible on a local network to the base station 12 , on cloud storage accessible via a wide area network to the base station 12 , or in any other location. The computer- readable media 126 stores modules, such as instructions, data stores, and so forth that are configured to execute on the processors 120 .

For instance, the computer- readable media 126 stores a 5G support indicator module 128 and a network settings module 130 . The 5G support indicator module 128 in base station 12 stores information about: whether base station 12 supports communication under 5G systems with NR (for example, Voice over NR-VoNR), whether a connected UE (for example, UE 14 ) supports communication under VoNR, whether a connected network supports communication under VoNR, whether one or more associated base stations support communication under VoNR, and so on. In some embodiments, the 5G support indicator module 128 stores a validity timeframe with one or more indicators of 5G VoNR communication support for networks, base stations, UEs, and so on. For example, the 5G support indicator module 128 may store information about a first UE UE 14 _ 1 supporting 5G VoNR communication from Aug. 1, 2019 onwards, store information about a second UE UE 14 _ 2 supporting 5G VoNR communication from Apr. 1, 2019 onwards, and store information about a third UE UE 14 _ 3 supporting 5G VoNR communication only from Nov. 1, 2019 to Dec. 31, 2020 (for example, for testing purposes). In some embodiments, base station 12 retrieves information about whether (and/or for what time period), a UE supports VoNR from a telecommunications service provider to which the UE is connected (for example, by querying a Home Subscriber Service (HSS)).

Although FIG. 1 illustrates the computer- readable media 126 in the BS 12 storing the 5G support indicator module 128 , the network settings module 130 , and/or one or more other modules (not illustrated), these modules can be stored in another component of the network 10 (for example, other than the BS 12 ). For example, one or more of these modules can be stored in a computer-readable media included in the OSS server 18 , the RNC 20 , another server associated with the network 10 , and so on.

As shown in the block diagram of FIG. 1 , the UEs 14 _ 1 comprises processors 140 , one or more transmit antennas (transmitters) 142 , one or more receive antennas (receivers) 144 , and computer- readable media 146 . The processors 140 are configured to execute instructions, which are stored in the computer- readable media 146 or in other computer-readable media accessible to the processors 140 . In some implementations, the processor 140 is a central processing unit (CPU), a graphics processing unit (GPU), or both CPU and GPU, or any other sort of processing unit. The one or more transmit antennas 142 transmit signals to the base station 12 , and the one or more receive antennas 144 receive signals from the base station 12 . The antennas

142 and 144 can be included in a transceiver module of the UE 14 .

The computer- readable media 146 stores several modules, such as instructions, data stores, and so forth that are configured to execute on the processors 140 . For instance, the computer- readable media 146 stores a configuration module 148 and a 5G support indicator module 150 . The 5G support indicator module 150 in UE 14 stores information about whether UE 14 supports communication under VoNR, whether a connected network supports communication under VoNR, whether one or more associated base stations support communication under VoNR, and so on. The 5G support indicator module 150 can store and classify this information based on a type of communication (for example, non-emergency voice, emergency voice, non-emergency text, emergency text, video, and so on), location of mobile device, and so on.

In some embodiments, the 5G support indicator module 150 stores a validity timeframe with one or more indicators of 5G VoNR communication support for networks, base stations and so on. For example, the 5G support indicator module 150 may store information about a first telecommunications network supporting 5G VoNR communication from Jan. 1, 2019, onwards, store information about a second telecommunications network supporting 5G VoNR communication from Jul. 10, 2019 onwards, and store information about a third telecommunications network supporting 5G VoNR communication only from May 1, 2019 to Dec. 31, 2019 (for example, for testing purposes). FIG. 5 illustrates an example data structure 500 maintained by the 5G support indicator module 150 to store information about various protocols supported by base stations according to various implementations. As illustrated in FIG. 5 , data structure 500 stores the following information: node identifiers (for example, base station identifier codes (BSIC)) 505 , locations 510 (e.g. Northeast US, Europe), supported protocols 515 (3G, 4G, 5G, etc.), supported frequencies 520 , validity start date- time 525 , validity end date- time 530 , and so on.

In some embodiments, information stored in the 5G support indicator module 150 (for example, values in data structure 500 ) is initially setup by an Original Equipment Manufacturer (OEM) when the UE is manufactured and/or before it is distributed to a subscriber. For example, an OEM can set-up initial values for whether base stations associated with a telecommunications service provider support VoNR and their associated validity timeframes. Information stored in the 5G support indicator module 150 can be periodically updated by an OEM, subscribed telecommunications service providers, connected base stations, UE subscriber, and so on. For example, when a subscribed telecommunications service provider can fully support VoNR, it can send an update to UE 14 _ 1 (for example, via Non-Access Stratum (NAS) layer messages) to update the corresponding information in the 5G support indicator module 150 of UE 14 _ 1 to indicate that the subscribed telecommunications service provider now fully supports VoNR (and as such, the EPS fallback procedure does not need to be invoked to complete a 5G VoNR call).

Although not illustrated in FIG. 1 , the computer- readable media 146 can also store one or more applications configured to receive and/or provide voice, data and messages (for example, short message service (SMS) messages, multi-media message service (MMS) messages, instant messaging (IM) messages, enhanced message service (EMS) messages, etc.) to and/or from another device or component (for example, the base station 12 , other UEs, etc.). Although not illustrated in FIG. 1 , the UEs 14 can also comprise various other components, for example, a battery, a charging unit, one or more network interfaces, an audio interface, a display, a keypad or keyboard, a GPS receiver and/or other location determination component, and other input and/or output interfaces.

Although FIG. 1 illustrates only one UE (UE 14 _ 1 ) in detail, each of the UEs 14 _ 2 , . . . , 14 _N can have a structure that is at least in part similar to that of the UE 14 _ 1 . For example, similar to the UE 14 _ 1 , each of the UEs 14 _ 2 , . . . , 14 _N comprise processors, one or more transmit antennas, one or more receive antennas, and computer-readable media including a configuration module.

The network settings module 130 of BS 12 , stored in the computer- readable media 126 , maintains one or more network settings associated with the network 10 . Individual network settings maintained by the network settings module 130 can be pertinent to a single UE of the UEs 14 _ 1 , . . . , 14 _N, a subset of the UEs 14 _ 1 , . . . , 14 _N, or each of the UEs 14 _ 1 , . . . , 14 _N. For example, a network setting of the one or more network settings can specify a maximum bit rate at which each of the UEs 14 _ 1 , . . . , 14 _N can transmit data to the BS 12 . Another network setting of one or more network settings can specify a transmit time interval (tti) used by each of the UEs 14 _ 1 , . . . , 14 _N to transmit data to the BS 12 . Yet another network setting can specify a maximum power that each of the UEs 14 _ 1 , . . . , 14 _N can use to transmit data to the BS 12 . One or more network settings maintained by the network settings module 130 can also include any other type of network settings.

One or more of the network settings maintained by the network settings module 130 can be communicated to the UEs 14 _ 1 , . . . , 14 _N (for example, by the transmit antennas 122 to the receive antennas 144 of the UEs 14 _ 1 , . . . , 14 _N). Based on receiving the network settings, the UEs 14 _ 1 , . . . , 14 _N (for example, the corresponding configuration modules 148 ) configure themselves and communicate with the BS 12 . The application server can also be located within the OSS server 18 or the RNC 20 , or be located outside the network 10 . The network 10 can include multiple application servers 134 .

The UEs 14 generally access or connect to the network 10 by a registration process. Likewise, the UEs 14 exit the network 10 by a de-registration process. While UEs 14 are registered with the network 10 , they communicate with the base station 12 by sending and/or receiving messages, feedback and commands. Examples of messages and commands include, but are not limited to the following: power-up, power-down, quality of service, data speed request, resource request, bandwidth request, call type origination, service type, power headroom report, radio bearer, handover. The UEs 14 and/or the base station 12 can perform one or more actions upon receiving a message. Examples of actions include, but are not limited to, increasing transmit power, decreasing transmit power, allocating resources, changing the format of transmission, and so on.

FIG. 2 is a flow diagram illustrating an overall process flow for performing EPS fallback according to various implementations. UE 14 _ 1 is communicatively coupled to a 5G node (gNB, NR, NGRAN, and so on) 12 . The 5G node or BS 12 is communicatively coupled to the 5G system (5G Core) 210 , which is supported by IMS 205 . As illustrated in FIG. 2 , when UE 14 _ 1 determines that either the UE 14 _ 1 itself, or the connected 5G node 12 , does not support communication over the 5G system (for example, does not support VoNR), UE 14 _ 1 will automatically invoke the EPS fallback procedure to fallback to a LTE base station (e_UTRAN or eNB 230 ) without first executing multiple signaling steps to try to connect to the IMS network 205 via the 5G NR 12 . As discussed below, this immediate trigger to perform the EPS fallback procedure can be achieved by enhancing logic in UE 14 _ 1 (for example, based on the 5G support indicator module 150 ) such that when communication is initiated at UE 14 _ 1 , instead of immediately sending a SIP INVITE from UE 14 _ 1 to the IMS network 205 (via the 5G NR 12 ), UE 14 _ 1 will automatically trigger the EPS fallback procedure to fallback to LTE by performing reselection to available LTE cell sites (for example, eNB 230 ). Once UE 14 _ 1 is latched on to an LTE cell site (eNB 230 ), UE 14 _ 1 will send a SIP INVITE to the connected LTE cell site 230 and re-establish IMS registration using the LTE cell site 230 and Evolved Packet Core (EPC) 215 (existing VoLTE call flow).

FIG. 3 is a flow diagram illustrating a set of operations 300 performed by a UE for immediately initiating the EPS fallback procedure according to various implementations. At block 305 , the UE detects whether communication is initiated. For example, communication can be initiated at the UE when a user dials a call and the UE attempts to establish a voice connection. Upon detecting that communication is initiated, at block 310 the UE determines whether the UE itself supports communication over the 5G system. For example, when a user dials an emergency number, the UE evaluates information stored in its 5G support indicator module to determine whether it supports emergency VoNR. When the UE itself supports communication over the 5G system, the UE then evaluates at block 315 whether the connected telecommunications network (for example, connected base station) supports communication over the 5G system. For example, when the user dials the emergency number, the UE evaluates information stored in its 5G support indicator module to determine whether the connected base station currently supports emergency VoNR. In some embodiments, the UE stores information about which communication protocols are currently supported by a connected base station (and the timeframe for such support) during registration (for example, when the UE sends a SIP REGISTER message to the connected base station). The UE can evaluate one or more of the following factors to determine whether the UE and/or the connected base station supports voice communication over 5G: OEM of the UE, attributes of the UE, OEM of the base station, attributes of the base station, current location of the UE, location history of the UE, subscriber plan of a subscriber of the UE, profile of the subscriber of the UE, type of communication initiated at block 305 , health of the connected base station, health of the telecommunications network, congestion in the telecommunications network, SIM associated with the UE, and so on. For example, the UE can evaluate one or more information elements of a NAS message (e.g., IMS voice over PS session over 3GPP access indicator field under 5GS Network Feature Support information element) to evaluate whether a connected telecommunications network support communication over 5G New Radio.

When both the UE and the connected network/base station support communication over the 5G system, at block 325 , the UE proceeds with establishing such communication (for example, setting up a call using VoNR). When the UE determines that either the UE itself or the connected network/base station does not support communication over the 5G system, at block 320 , the UE invokes the EPS fallback procedure (discussed in detail below with reference to FIGS. 4 A- 4 B ).

FIGS. 4 A- 4 B are flow diagrams illustrating a set of operations 400 for performing the EPS fallback procedure according to various implementations. Once communication is initiated by UE 14 at operation 1 ( a ) and UE 14 determines that either communication over the 5G system is not fully supported (for example, either UE 12 or NG RAN BS 12 does not support VoNR), at operation 1 ( b ) UE 14 sends a service request for EPS fallback to the connected NG RAN BS 12 . UE 14 can send the EPS fallback extended service request to NG RAN BS 12 via, for example, a 5G Non-Access Stratum (NAS) message (for example, 5G NAS Service Request) indicating that it requires EPS fallback for the communication. For example, UE 14 sends an extended service request to AMF 210 to allow the 5G core network to know that UE 14 wants to start a voice call using fall back to non-5G Radio. NG RAN BS 12 then forwards the EPS fallback service request to the 5G system (5G Core) 210 (for example, to an AMF node within the 5G Core). Upon receiving the EPS fallback service request, in operation 2 the 5G Core 210 requests NG RAN BS 12 to initiate handover to EPC 215 . For example, the 5G system 210 triggers a handover towards EPC 215 by executing an N2-AP procedure in which it indicates to NG RAN BS 12 that this is a handover for EPS fallback (for example, via communication between NG RAN BS 12 and AMF in the 5G system 210 ). In operation 3 , NG RAN BS 12 initiates handover of the communication to EPC and a 5G system to EPC handover is executed. In some embodiments, NG RAN 12 sends a command to UE 14 to perform handover (or RRC release with redirection/reselection) to E-UTRAN 230 at a particular frequency band. For example, a source base station (NG RAN 12 ) sends a âHand over Commandâ message to UE 14 once target base station (E-UTRAN 230 ) accepts the handover (for example, acknowledges the handover request) in preparation phase. The handover command can be an execution phase message that is triggered by a voice call setup command wherein a fall back to 4G Radio is required due to absences of Voice over New Radio (i.e. 5G) support. A frequency band can be selected based on the available bandwidth (frequency licensing), specific frequencies coverage and propagation characteristic, and so on. For example, based on one or more of the above factors, a network operator advises a UE to prioritize bands to be camped on. In several embodiments, when there is only 1 frequency available as sensed by

CLAIMS

Claims ( 20 )

The invention claimed is:

1. At least one computer-readable medium, excluding transitory signals and carrying instructions, which when executed in a base station, cause the base station to perform a method, the method comprising:

receiving an Evolved Packet System (EPS) fallback service request from a mobile device to the base station,

wherein the mobile device is associated with a 5G support indicator,

wherein the 5G support indicator includes information about whether the mobile device, or both the mobile device and the base station, support communication over 5G New Radio,

wherein the mobile device determines, based at least in part on the 5G support indicator, whether the mobile device supports communication over 5G New Radio,

wherein the mobile device determines, based at least in part on the 5G support indicator, whether the base station supports communication over new radio,

wherein the EPS fallback service request is generated by the mobile device directly in response to determining that either the mobile device or the base station does not support communication over new radio,

wherein the EPS fallback service request instructs the base station to initiate a fallback procedure from the 5G system to an Evolved Packet Core (EPC) system, and

wherein, when the mobile device initiates a communication, instead of immediately sending a SIP INVITE message to the base station, the mobile device automatically causes the EPC system to connect to an available 3G or 4G base station, based on the EPS fallback service request.

2. The computer-readable medium of claim 1 , wherein the EPS fallback service request comprises information of at least one frequency band to be used to perform the fallback procedure from the 5G system to the EPC system.

3. The computer-readable medium of claim 1 further comprising:

transmitting at least one protocol indicator to the mobile device,

wherein the protocol indicator informs the mobile device of a communication protocol supported by the base station, and

wherein the at least one protocol indicator associated with the base station is further associated with a timeframe during which the at least one protocol indicator is valid.

4. A mobile device for performing Evolved Packet System (EPS) fallback from a 5G system to an Evolved Packet Core (EPC) system, the mobile device comprising:

a communication interface configured to communicate with and connect to at least one base station; and

a memory storing computer executable instructions of:

determining, based at least in part on a 5G support indicator module of the mobile device, whether the mobile device supports voice communication over new radio (VoNR);

determining, based at least in part on the 5G support indicator module, whether a connected base station supports voice communication over new radio (VoNR);

in response to determining that either one of the mobile device or the connected base station does not support voice communication over new radio (VoNR):

transmitting an EPS fallback service request from the mobile device to the connected base station,

wherein the EPS fallback service request instructs the connected base station to initiate a fallback procedure from the 5G system to the EPC system, and

wherein the fallback procedure is initiated, based on the 5G support indicator module, to reduce setup time for a call initiated by the mobile device.

5. The mobile device of claim 4 wherein the memory further stores computer executable instructions of:

receiving at least one protocol indicator from the connected base station, wherein the protocol indicator informs the mobile device of a communication protocol supported by the connected base station; and

storing the at least one protocol indicator associated with the connected base station at the mobile device, and wherein the at least one protocol indicator associated with the base station is further associated with a timeframe during which the at least one protocol indicator is valid.

6. The mobile device of claim 4 wherein the memory further stores computer executable instructions of:

receiving at least one protocol indicator from the base station, wherein the protocol indicator informs the mobile device of a communication protocol supported by the base station; and

storing the at least one protocol indicator associated with the connected base station at the mobile device.

7. The mobile device of claim 4 wherein determining whether the mobile device supports voice communication over new radio (VoNR) and determining whether the connected base station supports voice communication over new radio (VoNR) is based at least in part on:

manufacturer of the mobile device,

manufacturer of the connected base station,

attributes of the mobile device,

attributes of the connected base station,

current location of the mobile device,

location of the connected base station,

location history of the mobile device,

subscriber plan of a subscriber of the mobile device,

profile of the subscriber of the mobile device,

type of communication initiated by the mobile device,

health of the connected base station,

health of a telecommunications network in which the connected base station resides,

congestion in the telecommunications network,

SIM associated with the mobile device,

or any combination thereof.

8. The mobile device of claim 4 wherein the EPS fallback service request is a Non-Access Stratum message.

9. The mobile device of claim 4 wherein the EPS fallback service request is transmitted to an access and management mobility function node in a telecommunications network in which the connected base station resides, and comprises information of at least one frequency band to be used to perform the fallback procedure from the 5G system to the EPC system.

10. The mobile device of claim 4 whereby, when the mobile device initiates communications, instead of immediately sending a SIP INVITE message to the at least one base station, the mobile device automatically triggers the EPS fallback service request to fall back to the EPC system by performing reselection to an available LTE base station.

11. The mobile device of claim 4 :

wherein the 5G support indicator module includes at least one protocol indicator that contains information about a communication protocol supported by one of the mobile device, the connected base station, or a telecommunications network associated with the connected base station; and

wherein the at least one protocol indicator is associated with at least one timeframe during which the at least one protocol indicator is valid.

12. At least one computer-readable medium, excluding transitory signals and containing instructions, that when executed by a processor, performs a method, the method comprising:

determining, based at least in part on 5G indicator data of a mobile device, whether the mobile device supports a communication over 5G new radio;

determining, based at least in part on the 5G indicator data, whether a base station supports the communication over 5G new radio;

in response to determining that either the mobile device or the base station does not support the communication over 5G new radio:

transmitting an Evolved Packet System (EPS) fallback service request from the mobile device to the base station,

wherein the EPS fallback service request instructs the base station to initiate a fallback procedure from a 5G system to an Evolved Packet Core (EPC) system, and

when the mobile device detects the communication, instead of immediately sending a SIP INVITE message to the base station, the mobile device automatically causes the EPC system to connect to an available 3G or 4G base station, based on the EPS fallback service request.

13. The computer-readable medium of claim 12 , wherein the communication is detected when the mobile device initiates a mobile originated (MO) call or when the mobile device receives an Internet Protocol (IP) Multimedia Subsystem (IMS) message indicating a mobile terminated (MT) call.

14. The computer-readable medium of claim 12 , wherein the base station is a new radio (NR) node or an evolved universal terrestrial radio access node (E-UTRAN), and wherein the 5G indicator data is stored in a memory of the mobile device.

15. The computer-readable medium of claim 12 , wherein the method further comprises:

receiving at least one protocol indicator from the base station, wherein the protocol indicator informs the mobile device of a communication protocol supported by the base station; and

storing the at least one protocol indicator associated with the base station at the mobile device, wherein the at least one protocol indicator associated with the base station is further associated with a timeframe during which the at least one protocol indicator is valid.

16. The computer-readable medium of claim 12 , wherein the method further comprises:

receiving at least one protocol indicator from the base station, wherein the protocol indicator informs the mobile device of a communication protocol supported by the base station; and

storing the at least one protocol indicator associated with the base station at the mobile device.

17. The computer-readable medium of claim 12 , wherein determining whether the mobile device supports the communication over new radio and determining whether the base station supports the communication over 5G new radio is based at least in part on:

manufacturer of the mobile device,

manufacturer of the base station,

attributes of the mobile device,

attributes of the base station,

current location of the mobile device,

location of the base station,

location history of the mobile device,

subscriber plan of a subscriber of the mobile device,

profile of the subscriber of the mobile device,

a type of the communication,

health of the base station,

health of a telecommunications network in which the base station resides,

congestion in the telecommunications network,

SIM associated with the mobile device,

or any combination thereof.

18. The computer-readable medium of claim 12 , wherein the communication is of a type:

non-emergency voice call,

emergency voice call,

non-emergency text message,

emergency text message,

video,

or any combination thereof.

19. The computer-readable medium of claim 12 , wherein the EPS fallback service request is a Non-Access Stratum message, and wherein the 5G indicator data includes information about whether the mobile device supports communication over 5G new radio.

20. The computer-readable medium of claim 12 , wherein the EPS fallback service request is transmitted to an access and management mobility function node in a telecommunications network in which the base station resides, and comprises information of at least one frequency band to be used to perform the fallback procedure from the 5G system to the EPC system, and wherein the fallback procedure is triggered, based on the 5G indicator data, to reduce setup time for the mobile device in response to the detecting of the communication.

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