Methods of handling emergency SMS over IP (IMS) in mobile communications
The proposed schemes address undefined UE behaviors in emergency SMS over IMS by determining access category and RRC cause, negotiating capabilities, and handling congestion, enhancing communication efficiency in diverse mobile networks.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- MEDIATEK SINGAPORE PTE LTD
- Filing Date
- 2025-11-14
- Publication Date
- 2026-05-21
Smart Images

Figure CN2025134881_21052026_PF_FP_ABST
Abstract
Description
METHODS OF HANDLING EMERGENCY SMS OVER IP (IMS) IN MOBILE COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0001] The present disclosure claims the priority benefit of India Patent Application No. 202421088427, filed 15 November 2024, the content of which herein being incorporated by reference in its entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to mobile communications and, more particularly, to handling of emergency Short Message Service (SMS) over Internet Protocol (IP) Multimedia Subsystem (IMS) in mobile communications.BACKGROUND
[0003] In wireless communications such as mobile communications under the current 3rd Generation Partnership Project (3GPP) specification, the behavior of a user equipment (UE) is still undefined in several aspects with respect to emergency SMS over IP at the time of the present disclosure. For instance, regarding capability negotiation, UE behavior is undefined in terms of how to handle and / or indicate a capability of the emergency SMS over IMS feature supported by the UE or a network. Additionally, regarding access class and category, when the UE detects or supports emergency SMS over IMS, UE behavior is undefined in terms of how to determine the access category and radio resource control (RRC) establishment cause for the emergency SMS over IMS. Moreover, regarding congestion handling, UE behavior is undefined when the UE needs to send an emergency SMS over IMS while backoff timer (s) is / are running (e.g., T3346, T3447 and such) .
[0004] Therefore, there is a need for a solution of handling of emergency SMS over IMS in mobile communications.SUMMARY
[0005] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits, and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0006] An objective of the present disclosure is to propose solutions or schemes that address the issue (s) described herein. More specifically, various schemes proposed in the present disclosure are believed to provide solutions pertaining to handling of emergency SMS over IMS in mobile communications. It is believed that implementations of one or more of the schemes proposed herein may address or otherwise alleviate the issues described above.
[0007] In one aspect, a method may involve a UE determining that there is a need for an emergency SMS over IMS. The method may also involve the UE determining either or both of an access category and a radio resource control (RRC) establishment cause for the emergency SMS over IMS. The method may further involve the UE an operation with respect to the emergency SMS over IMS.
[0008] In another aspect, a method may involve a UE communicating with a network to perform a capability negotiation about support of an emergency SMS over IMS. The method may also involve the UE performing an operation with respect to the emergency SMS over IMS.
[0009] In yet another aspect, a method may involve a UE determining that either or both: (i) there is a need for an emergency SMS over IMS, and (ii) a non-access stratum (NAS) backoff timer is running. The method may also involve the UE performing an operation with respect to congestion handling of the emergency SMS over IMS responsive to the determining.
[0010] It is noteworthy that, although the description provided herein may be in the context of certain radio access technologies, networks, and network topologies such as 5th Generation (5G) New Radio (NR) / Beyond Fifth-Generation (B5G) / 6th Generation (6G) mobile communications, the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies such as, for example and without limitation, 4th Generation (4G) / Long-Term Evolution (LTE) , LTE-Advanced, LTE-Advanced Pro, Internet-of-Things (IoT) , Narrow Band Internet of Things (NB-IoT) , Industrial Internet of Things (IIoT) , vehicle-to-everything (V2X) , and non-terrestrial network (NTN) communications. Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation in order to clearly illustrate the concept of the present disclosure.
[0012] FIG. 1 is a diagram of an example network environment in which various solutions and schemes in accordance with the present disclosure may be implemented.
[0013] FIG. 2 is a block diagram of an example communication system under a proposed scheme in accordance with the present disclosure.
[0014] FIG. 3 is a flowchart of a second example process under a proposed scheme in accordance with the present disclosure.
[0015] FIG. 4 is a flowchart of a second example process under a proposed scheme in accordance with the present disclosure.
[0016] FIG. 5 is a flowchart of a second example process under a proposed scheme in accordance with the present disclosure. DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0017] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations. Overview
[0018] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to handling of emergency SMS over IMS in mobile communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0019] FIG. 1 illustrates an example network environment 100 in which various solutions and schemes in accordance with the present disclosure may be implemented. FIG. 2 ~ FIG. 5 illustrate examples of implementation of various proposed schemes in network environment 100 in accordance with the present disclosure. The following description of various proposed schemes is provided with reference to FIG. 1 ~ FIG. 5.
[0020] Referring to FIG. 1, network environment 100 involves a UE 110 in wireless communication with a wireless network 120 (e.g., a mobile network including an NTN and a TN) via a terrestrial network node 125 (e.g., an evolved Node-B (eNB) , a Next Generation Node-B (gNB) , or a transmission / reception point (TRP) ) and / or a non-terrestrial network node 128 (e.g., a satellite) . For example, the terrestrial network node 125 and / or the non-terrestrial network node 128 may form a non-terrestrial network (NTN) serving cell for wireless communication with the UE 110. In some implementations, the UE 110 may be an IoT device such as an NB-IoT UE or an enhanced machine-type communication (eMTC) UE (e.g., a bandwidth reduced low complexity (BL) UE or a coverage enhancement (CE) UE) . In such communication environment, the UE 110, the network 120, the terrestrial network node 125, and the non-terrestrial network node 128 may implement various schemes pertaining to handling of emergency SMS over IMS in accordance with the present disclosure, as described below.
[0021] It is noteworthy that, while the various proposed schemes may be individually or separately described below, in actual implementations some or all of the proposed schemes may be utilized or otherwise implemented jointly. Of course, each of the proposed schemes may be utilized or otherwise implemented individually or separately. Moreover, as used herein, a lower layer may refer to a layer in the 5GMM protocol stack that is lower than the radio resource control (RRC) layer, such as a packet data convergence protocol (PDCP) layer, a radio control link (RLC) layer, a medium access control (MAC) layer, a physical (PHY) layer, or so forth.
[0022] Under a proposed scheme in accordance with the present disclosure, with respect to capability negotiation, each of a UE (e.g., UE 110) and a network (e.g., wireless network 120) may negotiate and / or indicate support of emergency SMS over IMS feature by using one or more mechanisms described below. In a first mechanism, the UE may send a new / existing bit in an existing information element (IE) of a Mobility Management (MM) (e.g., 6th Generation MM (6GMM) , 5th Generation MM (5GMM) , Evolved Packet System (EPS) MM (EMM) and the like) or a new IE in an existing / new message to the network (e.g., via a registration request, service request, attach request, and so on) to indicate the UE’s support for the emergency SMS over IMS to the network. In a second mechanism, in case that the network supports the emergency SMS over IMS, then the network may indicate in an existing / new bit / new IE (e.g., network feature support IE and the like) in an existing / new message to the UE (e.g., via a registration accept, service accept, configuration update command, attach accept, and so on) to the UE. In a third mechanism, the UE may be configured to support the emergency SMS over IMS, and / or the UE may support the emergency SMS over IMS feature if the UE is configured / indicated (e.g., by the network) to enable the support of the feature via a Management Object (MO) configuration mechanism or by information stored in a universal subscriber identity module (USIM) associated with the UE. In an event that the feature is enabled through MO configuration or by USIM or by secure packet, then UE may use the emergency SMS over IMS. Moreover, the emergency SMS over IMS feature support may be delivered to the UE via USIM configuration, management object (e.g., non-access stratum (NAS) MO) or secure packet (e.g., SMS) . In a fourth mechanism, the network may send support indication using access stratum (AS) message such as an existing or new system information block (SIB) or master information block (MIB) from a camped cell (e.g., the cell on which the UE is camped) .
[0023] Under a proposed scheme in accordance with the present disclosure, with respect to access class and category, when a UE (e.g., UE 110) determines a need to send an emergency SMS over IMS (e.g., by receiving a request from an upper layer for an emergency SMS over IMS and / or by the UE attempting to send an emergency SMS over IMS) , then the UE may perform one or more operations described below. Under the proposed scheme, the type of access attempt may be “emergency” or a newly introduced access attempt for the emergency SMS over IMS. Alternatively, or additionally, the access category may be 2 (= emergency) or a newly introduced access category for the emergency SMS over IMS. Alternatively, or additionally, a RRC establishment cause may be emergency or a newly introduced RRC establishment cause for the emergency SMS over IMS. Alternatively, or additionally, the emergency SMS over IMS service may be handled / considered similar to an emergency services. Alternatively, or additionally, the UE may be allowed to start procedures for the SMS over IMS if the access category can be 2 (=emergency) or a newly introduced access category for the emergency SMS over IMS is determined not barred or the barring is alleviated or otherwise lifted. Under the proposed scheme, the UE may consider an emergency service procedure as started when a 5GMM receives a request from upper layers to send an emergency SMS over IMS. Moreover, the UE may consider the emergency service procedure as stopped when the emergency SMS over IMS procedure is ended or resources released or a signaling connection established for the emergency SMS over IMS is released or the UE enters an IDLE mode.
[0024] Under a proposed scheme in accordance with the present disclosure, with respect to congestion handling, when a UE (e.g., UE 110) receives a request from an upper layer for an emergency SMS over IMS and / or the UE is attempting to send an emergency SMS over IMS and / or NAS backoff timers (e.g., T3346, T3447 and the like) are running, then for the emergency SMS over IMS the UE may perform one or more operations described below. For instance, the UE may be allowed to establish a (NAS) signaling connection. Alternatively, or additionally, the UE may be allowed to send an xMM (e.g., 6GMM, 5GMM or EMM) message to a network (e.g., wireless network 120) . In such a case, the xMM message may be, for example, an Uplink (UL) NAS TRANSPORT message, REGISTRATION REQUEST message, SERVICE REQUEST message, ATTACH REQUEST message, and so on. Alternatively, or additionally, the UE may notify the upper layer for failure of procedure so that the upper layer may attempt SMS over another domain such as a circuit-switching (CS) domain or IP core access network (IP-CAN) (e.g., WiFi and the like) . Illustrative Implementations
[0025] FIG. 2 illustrates an example communication system 200 having at least an example apparatus 210 and an example apparatus 220 in accordance with an implementation of the present disclosure. Each of apparatus 210 and apparatus 220 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to handling of emergency SMS over IMS in mobile communications, including the various schemes described above with respect to various proposed designs, concepts, schemes, systems and methods described above, including network environment 100, as well as processes described below.
[0026] Each of apparatus 210 and apparatus 220 may be a part of an electronic apparatus, which may be a network apparatus or a UE (e.g., UE 110) , such as a portable or mobile apparatus, a wearable apparatus, a vehicular device or a vehicle, a wireless communication apparatus or a computing apparatus. For instance, each of apparatus 210 and apparatus 220 may be implemented in a smartphone, a smart watch, a personal digital assistant, an electronic control unit (ECU) in a vehicle, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. Each of apparatus 210 and apparatus 220 may also be a part of a machine type apparatus, which may be an IoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a roadside unit (RSU) , a wire communication apparatus or a computing apparatus. For instance, each of apparatus 210 and apparatus 220 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. When implemented in or as a network apparatus, apparatus 210 and / or apparatus 220 may be implemented in an eNB in an LTE, LTE-Advanced or LTE-Advanced Pro network or in a gNB or TRP in a 5G network, an NR network, or an IoT network.
[0027] In some implementations, each of apparatus 210 and apparatus 220 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more complex-instruction-set-computing (CISC) processors, or one or more reduced-instruction-set-computing (RISC) processors. In the various schemes described above, each of apparatus 210 and apparatus 220 may be implemented in or as a network apparatus or a UE. Each of apparatus 210 and apparatus 220 may include at least some of those components shown in FIG. 2 such as a processor 212 and a processor 222, respectively, for example. Each of apparatus 210 and apparatus 220 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of apparatus 210 and apparatus 220 are neither shown in FIG. 2 nor described below in the interest of simplicity and brevity.
[0028] In one aspect, each of processor 212 and processor 222 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC or RISC processors. That is, even though a singular term “a processor” is used herein to refer to processor 212 and processor 222, each of processor 212 and processor 222 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of processor 212 and processor 222 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of processor 212 and processor 222 is a special-purpose machine specifically designed, arranged, and configured to perform specific tasks including those pertaining to handling of emergency SMS over IMS in mobile communications in accordance with various implementations of the present disclosure.
[0029] In some implementations, apparatus 210 may also include a transceiver 216 coupled to processor 212. Transceiver 216 may be capable of wirelessly transmitting and receiving data. In some implementations, transceiver 216 may be capable of wirelessly communicating with different types of wireless networks of different radio access technologies (RATs) . In some implementations, transceiver 216 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, transceiver 216 may be equipped with multiple transmit antennas and multiple receive antennas for multiple-input multiple-output (MIMO) wireless communications. In some implementations, apparatus 220 may also include a transceiver 226 coupled to processor 222. Transceiver 226 may include a transceiver capable of wirelessly transmitting and receiving data. In some implementations, transceiver 226 may be capable of wirelessly communicating with different types of UEs / wireless networks of different RATs. In some implementations, transceiver 226 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, transceiver 226 may be equipped with multiple transmit antennas and multiple receive antennas for MIMO wireless communications.
[0030] In some implementations, apparatus 210 may further include a memory 214 coupled to processor 212 and capable of being accessed by processor 212 and storing data therein. In some implementations, apparatus 220 may further include a memory 224 coupled to processor 222 and capable of being accessed by processor 222 and storing data therein. Each of memory 214 and memory 224 may include a type of random-access memory (RAM) such as dynamic RAM (DRAM) , static RAM (SRAM) , thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM) . Alternatively, or additionally, each of memory 214 and memory 224 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and / or electrically erasable programmable ROM (EEPROM) . Alternatively, or additionally, each of memory 214 and memory 224 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and / or phase-change memory.
[0031] Each of apparatus 210 and apparatus 220 may be a communication entity capable of communicating with each other using various proposed schemes in accordance with the present disclosure. For illustrative purposes and without limitation, a description of capabilities of apparatus 210, as a UE (e.g., UE 110) , and apparatus 220, as a network node (e.g., network node 125) of a network (e.g., wireless network 120 as a 5G / NR mobile network) , is provided below in the context of example processes 300, 400 and 500. Illustrative Processes
[0032] FIG. 3 illustrates an example process 300 in accordance with an implementation of the present disclosure. Process 300 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 300 may represent an aspect of the proposed concepts and schemes pertaining to handling of emergency SMS over IMS in mobile communications in accordance with the present disclosure. Process 300 may include one or more operations, actions, or functions as illustrated by one or more of blocks. Although illustrated as discrete blocks, various blocks of process 300 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 300 may be executed in the order shown in FIG. 3 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 300 may be executed repeatedly or iteratively. Process 300 may be implemented by or in apparatus 210 and apparatus 220 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 300 is described below in the context of apparatus 210 as a UE (e.g., UE 110) and apparatus 220 as a communication entity such as a network node (e.g., non-terrestrial network node 128 or terrestrial network node 125) of a network (e.g., wireless network 120) . Process 300 may begin at block 310.
[0033] At 310, process 300 may involve processor 212 of apparatus 210, as UE 110, determining that there is a need for an emergency SMS over IMS. Process 300 may proceed from 310 to 320.
[0034] At 320, process 300 may involve processor 212 establishing, via transceiver 216, a signaling connection for the emergency SMS over IMS. Process 300 may proceed from 320 to 330.
[0035] At 330, process 300 may involve processor 212 determining either or both of an access category and a RRC establishment cause for the emergency SMS over IMS. Process 300 may proceed from 330 to 340.
[0036] At 340, process 300 may involve processor 212 performing, via transceiver 216, an operation with respect to the emergency SMS over IMS with a network (e.g., wireless network 120 via apparatus 220 as non-terrestrial network node 128 or terrestrial network 125) .
[0037] In some implementations, in determining the access category, process 300 may involve processor 212 determining a type of an access attempt to be “emergency” or an access attempt indicating the access attempt is for the emergency SMS over IMS.
[0038] In some implementations, in determining the access category, process 300 may involve processor 212 determining the access category to be 2, representing emergency, or an access category indicating the UE is establishing the signaling connection for the emergency SMS over IMS.
[0039] In some implementations, in determining the RRC establishment cause, process 300 may involve processor 212 setting the RRC establishment cause to an emergency call or to the RRC establishment cause indicating the UE is establishing the signaling connection for the emergency SMS over IMS.
[0040] In some implementations, the establishing of the signaling connection for the emergency SMS over IMS may be handled in a way similar to one or more emergency services.
[0041] In some implementations, in performing the operation, process 300 may involve processor 212 starting a procedure for the emergency SMS over IMS responsive to: (a) the access category being 2, representing emergency; or (b) a new access category for the emergency SMS over IMS being determined not barred; or (c) barring of the emergency SMS over IMS being lifted.
[0042] FIG. 4 illustrates an example process 400 in accordance with an implementation of the present disclosure. Process 400 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 400 may represent an aspect of the proposed concepts and schemes pertaining to handling of emergency SMS over IMS in mobile communications in accordance with the present disclosure. Process 400 may include one or more operations, actions, or functions as illustrated by one or more of blocks. Although illustrated as discrete blocks, various blocks of process 400 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 400 may be executed in the order shown in FIG. 4 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 400 may be executed repeatedly or iteratively. Process 400 may be implemented by or in apparatus 210 and apparatus 220 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 400 is described below in the context of apparatus 210 as a UE (e.g., UE 110) and apparatus 220 as a communication entity such as a network node (e.g., non-terrestrial network node 128 or terrestrial network node 125) of a network (e.g., wireless network 120) . Process 400 may begin at block 410.
[0043] At 410, process 400 may involve processor 212 of apparatus 210, as UE 110, communicating, via transceiver 216, with a network (e.g., wireless network 120 via apparatus 220 as non-terrestrial network node 128 or terrestrial network 125) to perform a capability negotiation about support of an emergency SMS over IMS. Process 400 may proceed from 410 to 420.
[0044] At 420, process 400 may involve processor 212 performing, via transceiver 216, an operation with respect to the emergency SMS over IMS with the network.
[0045] In some implementations, in communicating with the network, process 400 may involve processor 212 transmitting, to the network, an indication of the UE’s support for the emergency SMS over IMS via a new or existing bit in an existing IE of a Mobility Management (MM) or a new IE in an existing or new message. In some implementations, the MM may include a 6GMM, 5GMM or EMM.
[0046] In some implementations, in communicating with the network, process 400 may involve processor 212 receiving, from the network, an indication of the network’s support for the emergency SMS over IMS via a new or existing bit or a new IE in an existing or new message. In some implementations, the existing or new message may include a registration accept message, service accept message, configuration update command message, or attach accept message.
[0047] In some implementations, in communicating with the network, process 400 may involve processor 212 receiving, from the network, an indication of the network’s support for the emergency SMS over IMS via an AS message from a camped cell. In some implementations, the AS message may include a SIB or MIB.
[0048] In some implementations, in performing the operation, process 400 may involve processor 212 using the emergency SMS over IMS responsive to the UE being configured, enabled or indicated to support the emergency SMS over IMS.
[0049] In some implementations, process 400 may further involve processor 212 obtaining a feature support of the emergency SMS over IMS from a USIM configuration, a MO or a secure packet.
[0050] FIG. 5 illustrates an example process 500 in accordance with an implementation of the present disclosure. Process 500 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 500 may represent an aspect of the proposed concepts and schemes pertaining to handling of emergency SMS over IMS in mobile communications in accordance with the present disclosure. Process 500 may include one or more operations, actions, or functions as illustrated by one or more of blocks. Although illustrated as discrete blocks, various blocks of process 500 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 500 may be executed in the order shown in FIG. 5 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 500 may be executed repeatedly or iteratively. Process 500 may be implemented by or in apparatus 210 and apparatus 220 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 500 is described below in the context of apparatus 210 as a UE (e.g., UE 110) and apparatus 220 as a communication entity such as a network node (e.g., non-terrestrial network node 128 or terrestrial network node 125) of a network (e.g., wireless network 120) . Process 500 may begin at block 510.
[0051] At 510, process 500 may involve processor 212 of apparatus 210, as UE 110, determining that either or both: (i) there is a need for an emergency SMS over IMS, and (ii) a NAS backoff timer is running. Process 500 may proceed from 510 to 520.
[0052] At 520, process 500 may involve processor 212, in response to the determining, performing, via transceiver 216, an operation with respect to congestion handling of the emergency SMS over IMS.
[0053] In some implementations, the NAS backoff timer may include at least one of T3346 and T3447.
[0054] In some implementations, in performing the operation, process 500 may involve processor 212 establishing a NAS signaling connection.
[0055] In some implementations, in performing the operation, process 500 may involve processor 212 transmitting a MM message to a network. In some implementations, the MM message comprises an UL NAS transport message, registration request message, service request message or attach request message. In some implementations, the MM may include a 6GMM, 5GMM or EMM.
[0056] In some implementations, in performing the operation, process 500 may involve processor 212 notifying an upper layer for failure of a procedure to cause the upper layer to attempt an SMS over another domain (e.g., CS domain) or IP-CAN (e.g., WiFi) . Additional Notes
[0057] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0058] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0059] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a” and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B. ”
[0060] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:determining, by a processor of a user equipment (UE) , that there is a need for an emergency Short Message Service (SMS) over Internet Protocol (IP) Multimedia Subsystem (IMS) ;establishing, by the processor, a signaling connection for the emergency SMS over IMS;determining, by the processor, either or both of an access category and a radio resource control (RRC) establishment cause for the emergency SMS over IMS; andperforming, by the processor, an operation with respect to the emergency SMS over IMS.2.The method of Claim 1, wherein the determining of the access category comprises determining a type of an access attempt to be “emergency” or an access attempt indicating the access attempt is for the emergency SMS over IP (IMS) .3.The method of Claim 1, wherein the determining of the access category comprises determining the access category to be 2, representing emergency, or an access category indicating the UE is establishing the signaling connection for the emergency SMS over IMS.4.The method of Claim 1, wherein the determining of the RRC establishment cause comprises setting the RRC establishment cause to an emergency call or to the RRC establishment cause indicating the UE is establishing the signaling connection for the emergency SMS over IMS.5.The method of Claim 1, wherein the establishing of the signaling connection for the emergency SMS over IMS is handled in a way similar to one or more of other emergency services.6.The method of Claim 1, wherein the performing of the operation comprises starting a procedure for the emergency SMS over IMS responsive to:the access category being 2, representing emergency; ora new access category for the emergency SMS over IMS being determined not barred; orbarring of the emergency SMS over IMS being lifted.7.A method, comprising:communicating, by a processor of a user equipment (UE) , with a network to perform a capability negotiation about support of an emergency Short Message Service (SMS) over Internet Protocol (IP) Multimedia Subsystem (IMS) ; andperforming, by the processor, an operation with respect to the emergency SMS over IMS.8.The method of Claim 7, wherein the communicating with the network comprises transmitting, to the network, an indication of the UE’s support for the emergency SMS over IMS via a new or existing bit in an existing information element (IE) of a Mobility Management (MM) or a new IE in an existing or new message.9.The method of Claim 8, wherein the MM comprises a 6th Generation Mobility Management (6GMM) , 5th Generation Mobility Management (5GMM) or Evolved Packet System (EPS) Mobility Management (EMM) .10.The method of Claim 7, wherein the communicating with the network comprises receiving, from the network, an indication of the network’s support for the emergency SMS over IMS via a new or existing bit or a new information element (IE) in an existing or new message.11.The method of Claim 10, wherein the existing or new message comprises a registration accept message, service accept message, configuration update command message, or attach accept message.12.The method of Claim 7, wherein the communicating with the network comprises receiving, from the network, an indication of the network’s support for the emergency SMS over IMS via an access stratum (AS) message from a camped cell.13.The method of Claim 12, wherein the AS message comprises a system information block (SIB) or master information block (MIB) .14.The method of Claim 7, wherein the performing of the operation comprises using the emergency SMS over IMS responsive to the UE being configured, enabled or indicated to support the emergency SMS over IMS.15.The method of Claim 14, further comprising:obtaining, by the processor, a feature support of the emergency SMS over IMS from a universal subscriber identity module (USIM) configuration, a management object (MO) or a secure packet.16.A method, comprising:determining, by a processor of a user equipment (UE) , that either or both:there is a need for an emergency Short Message Service (SMS) over Internet Protocol (IP) Multimedia Subsystem (IMS) , anda non-access stratum (NAS) backoff timer is running; andperforming, by the processor, an operation with respect to congestion handling of the emergency SMS over IMS responsive to the determining.17.The method of Claim 16, wherein the NAS backoff timer comprises at least one of T3346 and T3447.18.The method of Claim 16, wherein the performing of the operation comprises establishing a NAS signaling connection.19.The method of Claim 16, wherein the performing of the operation comprises transmitting a Mobility Management (MM) message to a network, wherein the MM message comprises an uplink (UL) NAS transport message, registration request message, service request message or attach request message, and wherein the MM comprises a 6th Generation Mobility Management (6GMM) , 5th Generation Mobility Management (5GMM) or Evolved Packet System (EPS) Mobility Management (EMM) .20.The method of Claim 16, wherein the performing of the operation comprises notifying an upper layer for failure of a procedure to cause the upper layer to attempt an SMS over another domain or Internet Protocol (IP) core access network (IP-CAN) .