Methods of cellular internet of things connection release handling after activation of congestion control for transport of user data via control plane in mobile communications
Patent Information
- Application Number
- PCT/CN2026/082731
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-04-21
- Filing Date
- 2026-03-11
- Publication Date
- 2026-09-17
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Figure CN2026082731_17092026_PF_FP_ABST
Abstract
Description
METHODS OF CELLULAR INTERNET OF THINGS CONNECTION RELEASE HANDLING AFTER ACTIVATION OF CONGESTION CONTROL FOR TRANSPORT OF USER DATA VIA CONTROL PLANE IN MOBILE COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0001] The present disclosure claims the priority benefit of India Patent Application Nos. 202521021931 and 202521038139, filed 11 March 2025 and 21 April 2025, respectively, the contents of which herein being incorporated by reference in their entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to mobile communications and, more particularly, to handling of cellular Internet of things (CIoT) connection release after activation of congestion control for transport of user data via a control plane in mobile communications.BACKGROUND
[0003] In wireless communications such as mobile communications under the current 3rd Generation Partnership Project (3GPP) specification, a network may activate congestion control for transport of user data via the control plane, as specified in the 3GPP technical specification (TS) 23.501. In a user equipment (UE) has indicated to the network the UE’s support for the control plane CIoT 5th Generation System (5GS) optimizations and the network decides to activate the congestion control for transport of user data via the control plane, the network may include a value for the control plane data back-off timer T3448 in a REGISTRATION ACCEPT, SERVICE ACCEPT or SERVICE REJECT message, and the network is to store a control plane data back-off time on a per-UE basis. The UE starts the timer T3448 with the value indicated in the message.
[0004] To avoid that large numbers of UEs simultaneously initiate deferred requests, the network may likely select the value for the timer T3448 for the informed UEs so that timeouts are not synchronised. Based on local policy, the network needs not to include a value for the control plane data back-off timer T3448 in the REGISTRATION ACCEPT, SERVICE ACCEPT or SERVICE REJECT message to a UE which is configured for high-priority access in a selected public land mobile network (PLMN) . Moreover, the network may send a REGISTRATION ACCEPT message or SERVICE ACCEPT message without T3448 value information element (IE) to stop the timer T3448 running in the UE.
[0005] However, when the UE is using a control plane service request message to transmit user data in a CIoT user data container and the network activates congestion for transport of user data via the control plane, the UE may receive a service reject message with cause #22 along with a timer value for T3448. In this case, the UE is to remain in a connected mode until the network releases the connection; however, the battery of the UE / CIoT device would be drained out if the network never releases the connection.
[0006] Therefore, there is a need for a solution of handling of CIoT connection release after activation of congestion control for transport of user data via a control plane in mobile communications.SUMMARY
[0007] 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.
[0008] 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 CIoT connection release after activation of congestion control for transport of user data via a control plane 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.
[0009] In one aspect, a method may involve a UE receiving a message from a network with a control plane data back-off timer. The message may also include a value indicating that the control plane data back-off timer is other than zero or deactivated. In response to the receiving, the method may involve the UE starting a connection release guard timer to allow the network to release a non-access stratum (NAS) signaling connection.
[0010] In another aspect, an apparatus implementable in a UE may include a transceiver configured to communicate wirelessly and a processor coupled to the transceiver. The processor may receive a message from a network with a control plane data back-off timer. The message may also include a value indicating that the control plane data back-off timer is other than zero or deactivated. In response to the receiving, the processor may start a connection release guard timer to allow the network to release a non-access stratum (NAS) signaling connection.
[0011] 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
[0012] 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.
[0013] 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.
[0014] FIG. 2 is a block diagram of an example communication system under a proposed scheme in accordance with the present disclosure.
[0015] FIG. 3 is a flowchart of an example process under a proposed scheme in accordance with the present disclosure. DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0016] 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
[0017] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to handling of CIoT connection release after activation of congestion control for transport of user data via a control plane 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.
[0018] 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. 3 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. 3.
[0019] 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 CIoT connection release after activation of congestion control for transport of user data via a control plane in accordance with the present disclosure, as described below. 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.
[0020] Under a proposed scheme in accordance with the present disclosure, in case of any of the following situations with respect to a UE (e.g., UE 110) : (1) the UE is using 5GS (EPS in 4G, 6GS in 6G) services with control plane CIoT 5GS (or Evolved Packet System (EPS) in 4G or 6th Generation System (6GS) in 6G) optimization; and / or (2) the UE receives a value for timer T3448 (regarding congestion for transport of user data via the control plane) in a message from a network (e.g., wireless network 120) to the UE (e.g., SERVICE REJECT message, REGISTRATION REJECT message, REGISTREATION ACCEPT message, SERVICE ACCEPT message, ATTACH ACCEPT message, TAU ACCEPT message, for example but not limited thereto) ; and / or (3) the UE receives a SERVICE ACCEPT or SERVICE REJECT message when a service request procedure was initiated in an idle mode and / or the UE receives a message other than the SERVICE ACCEPT and SERVICE REJECT message (e.g., REGISTRATION ACCEPT message) ; and / or (4) the value indicates that the timer T3448 is neither zero nor deactivated (e.g., the value is more than zero) , then the UE may perform one or more operations under the proposed scheme. For instance, the UE may start a connection release guard timer for a non-access stratum (NAS) signaling connection, with the connection release guard timer being T3440 in EPS, T3540 in 5GS or T3640 in 6GS. Alternatively, or additionally, the UE may perform local release of the NAS signaling connection. Alternatively, or additionally, the network may release the NAS signaling connection.
[0021] Under another proposed scheme in accordance with the present disclosure, when the connection release guard timer is running due to any of the aforementioned reasons and / or when there is a request from an upper layers to perform an emergency services fallback only for a UE in a 3GPP access or to establish an emergency protocol data unit (PDU) session, then the UE may perform one or more operations under the proposed scheme. For instance, the UE may stop a timer T3540. Alternatively, or additionally, the UE may send an uplink (UL) signaling via an existing N1 NAS signaling connection. Alternatively, or additionally, the UE may locally release the N1 NAS signaling connection. Alternatively, or additionally, the UE may not send the uplink signaling until expiry of a connection release guard timer or the connection release guard timer having been stopped.
[0022] In general, a signaling procedure for the release of an N1 NAS signaling connection is initiated by the network. In N1 mode, upon indication from lower layers that an access stratum (AS) connection has been released, the UE may enter a 5GMM-IDLE mode and consider the N1 NAS signaling connection released. Under the proposed schemes, to allow the network to release the N1 NAS signaling, the UE may start the timer T3540 in case that: (1) the UE receives a SERVICE REJECT or SERVICE ACCEPT message with a control plane data back-off timer, with a value indicating that the control plane data back-off timer is neither zero nor deactivated, while a service request procedure has been initiated in the 5GMM-IDLE mode; or (2) the UE receives a REGISTRATION ACCEPT message with a control plane data back-off timer, with a value indicating that the control plane data back-off timer is neither zero nor deactivated.
[0023] As an implementational example, to allow the network to release the N1 NAS signaling, the UE may start the timer T3440 in case that: (1) the UE receives a SERVICE REJECT, SERVICE ACCEPT message with timer T3448 value IE, the UE starts the timer T3448 and the service request procedure has been initiated in EMM-IDLE mode; or (2) the UE receives an ATTACH ACCEPT or TRACKING AREA UPDATE ACCEPT message with timer T3448 value IE and the UE starts the timer T3448.
[0024] As an implementational example, to allow the network to release the N1 NAS signaling, the UE may start the timer T3540 in case that: (1) the UE receives a SERVICE REJECT or SERVICE ACCEPT message with timer T3448 value IE, the UE starts the timer T3448 and the service request procedure has been initiated in 5GMM-IDLE mode; or (2) the UE receives a REGISTRATION ACCEPT message with timer T3448 value IE and the UE starts the timer T3448. 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 CIoT connection release after activation of congestion control for transport of user data via a control plane 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 “aprocessor” 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 CIoT connection release after activation of congestion control for transport of user data via a control plane 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 process 300. 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 CIoT connection release after activation of congestion control for transport of user data via a control plane 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 310 and 320. 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, receiving, via transceiver 216, from a network (e.g., wireless network 120 via apparatus 220 as non-terrestrial network node 128 or terrestrial network node 125) a message with a control plane data back-off timer. The message also including a value indicating that the control plane data back-off timer is other than zero or deactivated. Process 300 may proceed from 310 to 320.
[0034] At 320, process 300 may involve processor 212 starting, in response to receiving the message, a connection release guard timer to allow the network to release a NAS signaling connection.
[0035] In some implementations, in receiving the message, process 300 may involve processor 212 receiving the message while a service request procedure has been initiated in an idle mode.
[0036] In some implementations, in receiving the message, process 300 may involve processor 212 starting the control plane data back-off timer.
[0037] In some implementations, the message may include a SERVICE REJECT message or a SERVICE ACCEPT message or a REGISTRATION ACCEPT message.
[0038] In some implementations, the connection release guard timer may include a timer T3440 in an EPS, a timer T3540 in a 5GS or a 6GS, or a timer T3640 in the 6GS.
[0039] In some implementations, process 300 may further involve processor 212, upon an event in the UE, stopping the connection release guard timer and locally releasing the NAS signaling connection.
[0040] In some implementations, process 300 may further involve processor 212, upon an event that triggers, stopping the connection release guard timer and transmitting, via transceiver 216, an uplink signaling via the NAS signaling connection. In some implementations, the event may involve a request to perform emergency services fallback or establishing an emergency PDU session.
[0041] In some implementations, the control plane data back-off timer may include a timer T3448. Additional Notes
[0042] 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.
[0043] 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.
[0044] 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., “asystem 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., “asystem 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. ”
[0045] 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:receiving, by a processor of a user equipment (UE) , a message from a network with a control plane data back-off timer, the message also comprising a value indicating that the control plane data back-off timer is other than zero or deactivated; andresponsive to the receiving, starting, by the processor, a connection release guard timer to allow the network to release a non-access stratum (NAS) signaling connection.2.The method of Claim 1, wherein the receiving of the message comprises receiving the message while a service request procedure has been initiated in an idle mode.3.The method of Claim 2, wherein the receiving of the message comprises starting the control plane data back-off timer.4.The method of Claim 1, wherein the message comprises a SERVICE REJECT message or a SERVICE ACCEPT message or a REGISTRATION ACCEPT message.5.The method of Claim 1, wherein the connection release guard timer comprises a timer T3440 in an Evolved Packet System (EPS) .6.The method of Claim 1, wherein the connection release guard timer comprises a timer T3540 in a 5th Generation System (5GS) or a 6th Generation System (6GS) or a timer T3640 in the 6GS.7.The method of Claim 1, further comprising:upon an event in the UE, stopping, by the UE, the connection release guard timer and locally releasing the NAS signaling connection.8.The method of Claim 1, further comprising:upon an event that triggers, stopping, by the UE, the connection release guard timer and transmitting an uplink signaling via the NAS signaling connection.9.The method of Claim 8, wherein the even comprises a request to perform emergency services fallback or establishing an emergency protocol data unit (PDU) session.10.The method of Claim 1, wherein the control plane data back-off timer comprises a timer T3448.11.An apparatus implementable in a user equipment (UE) , comprising:a transceiver configured to communicate wirelessly; anda processor coupled to the transceiver and configured to perform operations comprising:receiving, via the transceiver, a message from a network with a control plane data back-off timer, the message also comprising a value indicating that the control plane data back-off timer is other than zero or deactivated; andresponsive to the receiving, starting a connection release guard timer to allow the network to release a non-access stratum (NAS) signaling connection.12.The apparatus of Claim 11, wherein the receiving of the message comprises receiving the message while a service request procedure has been initiated in an idle mode.13.The apparatus of Claim 12, wherein the receiving of the message comprises starting the control plane data back-off timer.14.The apparatus of Claim 11, wherein the message comprises a SERVICE REJECT message or a SERVICE ACCEPT message or a REGISTRATION ACCEPT message.15.The apparatus of Claim 11, wherein the connection release guard timer comprises a timer T3440 in an Evolved Packet System (EPS) .16.The apparatus of Claim 11, wherein the connection release guard timer comprises a timer T3540 in a 5th Generation System (5GS) or a 6th Generation System (6GS) or a timer T3640 in the 6GS.17.The apparatus of Claim 11, wherein the processor is further configured to perform operations comprising:upon an event in the UE, stopping the connection release guard timer and locally releasing the NAS signaling connection.18.The apparatus of Claim 11, wherein the processor is further configured to perform operations comprising:upon an event that triggers, stopping, by the UE, the connection release guard timer and transmitting, via the transceiver, an uplink signaling via the NAS signaling connection.19.The apparatus of Claim 18, wherein the event comprises a request to perform emergency services fallback or establishing an emergency protocol data unit (PDU) session.20.The apparatus of Claim 11, wherein the control plane data back-off timer comprises a timer T3448.