WO2022061659A1 - Procédés, entités et support lisible par ordinateur pour la divulgation d'association sgs entre mme et msc - Google Patents

Procédés, entités et support lisible par ordinateur pour la divulgation d'association sgs entre mme et msc Download PDF

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Publication number
WO2022061659A1
WO2022061659A1 PCT/CN2020/117486 CN2020117486W WO2022061659A1 WO 2022061659 A1 WO2022061659 A1 WO 2022061659A1 CN 2020117486 W CN2020117486 W CN 2020117486W WO 2022061659 A1 WO2022061659 A1 WO 2022061659A1
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WIPO (PCT)
Prior art keywords
mme
indication
hss
sms
voice
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PCT/CN2020/117486
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English (en)
Inventor
Lei Xia
Xiaoming Li
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Telefonaktiebolaget Lm Ericsson (Publ)
Lei Xia
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Priority to PCT/CN2020/117486 priority Critical patent/WO2022061659A1/fr
Publication of WO2022061659A1 publication Critical patent/WO2022061659A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1073—Registration or de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data

Definitions

  • the present disclosure generally relates to the technical field of communication technologies, and particularly to methods, entities, and computer readable media for releasing an SGs association between a Mobility Management Entity (MME) and a Mobile Switching Center (MSC) .
  • MME Mobility Management Entity
  • MSC Mobile Switching Center
  • CS Circuit Switched
  • EPS Evolved Packet System
  • the voice call support may be a typical use case of communication service for accessing the CS domain.
  • the SGs interface connecting an MSC/Visitor Location Register (VLR) and a Serving General Packet Radio Service Support Node (SGSN) -MME, is used for registration in the MSC/VLR of a User Equipment (UE) by performing combined procedures, to page the UE on behalf of the MSC/VLR, and to convey CS-related services.
  • a CS call may fall back to Wideband Code Division Multiple Access (WCDMA) and Global System for Mobile Communications (GSM) to perform a voice call for a UE initially connected to the EPS network.
  • WCDMA Wideband Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • SMS Short Messaging Service
  • LTE Long Term Evolution
  • PS Voice over Packet Switched
  • IMS IP Multimedia Subsystem
  • the MME Even if these UEs may support use of an IMS PDN connection to experience voice call and SMS services, the MME still needs to create the SGs association with the MSC if the UE initiates the combined registration, and cannot release the SGs association with the MSC even if the UE has an IMS PDN connection for the voice call and SMS services. This will cause difficulty of cutting down the MSC.
  • the present disclosure provides technical solutions of releasing the SGs association between the MME and the MSC if the UE has an IMS PDN connection for the voice call and SMS services, in order to offload the MSC nodes as much as possible, then finally may even phase out the MSC nodes in the network.
  • a method at an HSS includes: obtaining a first indication indicating that registration of both voice and SMS for a UE over an IMS PDN connection is successful; and transmitting, to an MME serving the UE, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered.
  • the method further includes: receiving, from the MME, a third indication notifying the HSS of determining a status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the method further includes: determining that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication.
  • the third indication comprises an information element indicating that an SGs association for the UE between the MME and an MSC serving the UE is setup for the voice and/or the SMS for the UE, and is comprised in a Notify Request message.
  • the third indication is received from the MME during inter-MME mobility from an old MME to the MME, in any of cases where:
  • the HSS has not transmitted, to the old MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or
  • the old MME has not triggered a process of releasing an SGs association for the UE between the old MME and an MSC serving the UE.
  • the second indication is included in an Insert Subscriber Data Request message.
  • the second indication is comprised in a Notify Answer message.
  • the first indication is obtained from an IMS server.
  • a method at an MME includes: receiving, from an HSS, a second indication indicating that both voice and SMS for a UE over an IMS PDN connection are registered; and triggering a process of releasing an SGs association for the UE between the MME and an MSC serving the UE, in response to the received second indication.
  • the method before the second indication is received from the HSS, the method further includes: transmitting, to the HSS, a third indication notifying the HSS of determining a status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the third indication includes an information element indicating that the SGs association for the UE between the MME and the MSC is setup for the voice and/or the SMS for the UE, and is comprised in a Notify Request message.
  • the third indication is transmitted by the MME to the HSS during inter-MME mobility from an old MME to the MME, in any of cases where:
  • the HSS has not transmitted, to the old MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or
  • the old MME has not triggered a process of releasing an SGs association for the UE between the old MME and the MSC.
  • the second indication is comprised in an Insert Subscriber Data Request message.
  • the second indication is comprised in a Notify Answer message.
  • an HSS includes: at least one processor, and at least one memory, storing instructions which, when executed on the at least one processor, cause the HSS to perform any of the methods according to the first aspect of the present disclosure.
  • an MME includes: at least one processor, and at least one memory, storing instructions which, when executed on the at least one processor, cause the MME to perform any of the methods according to the second aspect of the present disclosure.
  • a computer readable storage medium has computer program instructions stored thereon, the computer program instructions, when executed by at least one processor, causing the at least one processor to perform the method according to any of the first and second aspects of the present disclosure.
  • the technical solutions of the present disclosure may provide an efficient way to release the SGs association by the MME for the UE that may use the IMS service to have the voice call and the SMS over the IMS PDN connection, in order to decrease the need on the MSC nodes and save the operating expense for the operator.
  • FIG. 1 schematically shows an exemplary SG association between an MME and an MSC
  • FIG. 2 schematically shows a method at an HSS for releasing an SGs association between an MME and an MSC according to an exemplary embodiment of the present disclosure
  • FIG. 3 schematically shows a method at an MME for releasing an SGs association between an MME and an MSC according to an exemplary embodiment of the present disclosure
  • FIG. 4 schematically shows an exemplary signaling sequence diagram of releasing an SGs association between an MME and an MSC according to an exemplary embodiment of the present disclosure, in which exemplary methods for releasing an SGs association between an MME and an MSC according to an exemplary embodiment of the present disclosure are applied;
  • FIG. 5 schematically shows a structural block diagram of an HSS according to an exemplary embodiment of the present disclosure
  • FIG. 6 schematically shows a structural block diagram of an HSS according to another exemplary embodiment of the present disclosure
  • FIG. 7 schematically shows a structural block diagram of an MME according to an exemplary embodiment of the present disclosure.
  • FIG. 8 schematically shows a structural block diagram of an MME according to another exemplary embodiment of the present disclosure.
  • exemplary is used herein to mean “illustrative, ” or “serving as an example, ” and is not intended to imply that a particular embodiment is preferred over another or that a particular feature is essential.
  • first is used simply to distinguish one particular instance of an item or feature from another, and do not indicate a particular order or arrangement, unless the context clearly indicates otherwise.
  • step, is meant to be synonymous with “operation” or “action. ” Any description herein of a sequence of steps does not imply that these operations must be carried out in a particular order, or even that these operations are carried out in any order at all, unless the context or the details of the described operation clearly indicates otherwise.
  • references in the specification to “one embodiment, ” “an embodiment, ” “an example embodiment, ” etc. indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • the term “network” refers to a network following any suitable (wireless or wired) communication standards.
  • the wireless communication standards may comprise new radio (NR) , long term evolution (LTE) , LTE-Advanced, wideband code division multiple access (WCDMA) , high-speed packet access (HSPA) , Code Division Multiple Access (CDMA) , Time Division Multiple Address (TDMA) , Frequency Division Multiple Access (FDMA) , Orthogonal Frequency-Division Multiple Access (OFDMA) , Single carrier frequency division multiple access (SC-FDMA) and other wireless networks.
  • NR new radio
  • LTE long term evolution
  • WCDMA wideband code division multiple access
  • HSPA high-speed packet access
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Address
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency-Division Multiple Access
  • SC-FDMA Single carrier frequency division multiple access
  • a CDMA network may implement a radio technology such as Universal Terre
  • UTRA includes WCDMA and other variants of CDMA.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • An OFDMA network may implement a radio technology such as Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, Ad-hoc network, wireless sensor network, etc.
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • Ad-hoc network wireless sensor network
  • the communications between two devices in the network may be performed according to any suitable communication protocols, including, but not limited to, the wireless communication protocols as defined by a standard organization such as 3GPP or the wired communication protocols.
  • the wireless communication protocols may comprise the first generation (1G) , 2G, 3G, 4G, 4.5G, 5G communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • entity refers to a network device or network node or network function in a communication network, and may also refer to a virtualized entity that may be implemented on cloud.
  • a core network device may offer numerous servicesto customers who are interconnected by an access network device. Each access network device is connectable to the core network device over a wired or wireless connection.
  • the MME may transmit e.g., a Notify Request (NOR) message to the HSS to notify the HSS of checking/determining the IMS registration status of the UE.
  • NOR Notify Request
  • the HSS may autonomously check/determine the IMS registration status of the UE without depending on the notification from the MME.
  • the HSS may transmit an indication, e.g., “Voice and SMS over IMS Registered” , to the MME.
  • the MME may trigger a process of releasing the SGs association. For example, the MME may releases the SGs association during a combined TAU procedure by transmitting an EPS Tracking Area Update (TAU) Accept message only with an indication e.g.
  • TAU EPS Tracking Area Update
  • CS Domain Not Available to the UE and an International Mobile Subscriber Identity (IMSI) Detach Indication to the MSC; then, the MSC resources may be released, and less MSC nodes are needed in the network. Subsequently, both the UE’s voice call and SMS services may use the IMS PDN connection over the PS data.
  • IMSI International Mobile Subscriber Identity
  • the method 200 may be performed in a case where an UE has successful combined registration with the MSC through the MME and an SGs association between the MME and the MSC is setup, and the UE also supports voice and SMS over PS data, and the MME transmits e.g., a “Support Voice over PS” indication in e.g., a registration accept message to the UE; then, the UE initiates an IMS PDN connectivity procedure, and an IMS PDN connection is setup successfully.
  • a “Support Voice over PS” indication in e.g., a registration accept message to the UE
  • the HSS may obtain an indication (called “first indication” for ease of description hereinafter) indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful.
  • the HSS may obtain the first indication from the IMS server.
  • the HSS may determine that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication.
  • the HSS may transmit, to the MME, an indication (called “second indication” for ease of description hereinafter) indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger a process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication, which will be described in detail later with reference to FIG. 4.
  • second indication for ease of description hereinafter
  • the second indication may be included in an Insert subscriber Data Request (IDR) message that is transmitted from the HSS to the MME.
  • the second indication may include an information element indicating “Voice and SMS over IMS PDN Registered” , which may be represented by a bit that is set in IDR-Flags.
  • Table 1 shows an exemplary change in the IDR-Flags as specified in 3GPP TS 29.272 V15.10.0 (which is incorporated herein by reference) , in which the definition of newly added bit is shown as underlined text in Bold.
  • the HSS may autonomously determine the status of the registration of both the voice and the SMS (i.e., the IMS registration status) for the UE over the IMS PDN connection based on the first indication received from the MSC, and transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the MME may autonomously determine the status of the registration of both the voice and the SMS (i.e., the IMS registration status) for the UE over the IMS PDN connection based on the first indication received from the MSC, and transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the HSS may determine the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection, depending on an notification from the MME.
  • the method 200 may further include step S201, in which the HSS receives, from the MME, an indication (called “third indication” for ease of description hereinafter) notifying the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • step S201 in which the HSS receives, from the MME, an indication (called “third indication” for ease of description hereinafter) notifying the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the third indication may be included in an NOR message that is transmitted from the MME to the HSS.
  • the third indication may include an information element indicating that the SGs association between the MME and the MSC is setup for the voice and/or the SMS of the UE, e.g. indicating “CS Service on SGs Ready” , which may be represented by a bit that is set in NOR-Flags.
  • the CS service may include SMS, or both SMS and voice etc.
  • Table 1 shows exemplary change in NOR-Flags as specified in 3GPP TS 29.272 V15.10.0, in which the definition of newly added bit is shown as underlined text in Bold.
  • the HSS may obtain, in step S203, the first indication indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful; and determine, in step S205, that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication; then in step S207, transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the second indication may be included in the IDR message, like what has been described previously in the exemplary embodiment in which the HSS autonomously determine the IMS registration status of the UE without depending on the notification from the MME.
  • the second indication may also be included in a Notify Answer message in a similar way with the case of including the second indication in the IDR message.
  • the Notify Answer message is transmitted by the HSS to the MME in response to the NOR message received by the HSS.
  • the Notify Answer message carrying the second indication is transmitted by the HSS, after the HSS performs the step S203 of obtaining the first indication indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful; and the step S205 of determining that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ based on the obtained first indication.
  • the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC upon receiving the Notify Answer message, without the IDR message from the HSS to the MME and an Insert Subscriber Data Answer message from the MME to the HSS.
  • the second indication being carried in the Notify Answer message may save signaling, although in the case of the second indication being carried in the IDR message, the Notify Answer message may be transmitted more quickly.
  • the method 200 may also be applicable in some special cases during inter-MME mobility.
  • inter-MME mobility may occur when the HSS has not transmitted, to the old MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or the old MME has not triggered the process of releasing the SGs association for the UE between the old MME and the MSC, e.g., before UE is informed that “CS domain not available” in old MME, so that the new MME may receive information related to both the SG association and the IMS PDN connection.
  • the MME as a new MME, needs to notify the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the HSS may receive, from the MME, a third indication notifying the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the HSS may obtain, in step S203, the first indication indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful; and determine, in step S205, that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication; then in step S207, transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the method 300 at the MME corresponds to the method 200 at the HSS. Thus, some description of the method 300 may refer to that of method 200, and thus will be omitted for simplicity.
  • the method 300 may be performed in a case where an UE has successful combined registration with the MSC through the MME and an SGs association between the MME and the MSC is setup, and the UE also supports voice and SMS over PS data, and the MME transmits e.g., a “Support Voice over PS” indication in e.g., a registration accept message to the UE; then, the UE initiates an IMS PDN connectivity procedure, and an IMS PDN connection is setup successfully.
  • a “Support Voice over PS” indication in e.g., a registration accept message to the UE
  • the HSS may obtain, e.g., from the IMS server, a first indication indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful.
  • the HSS may determine that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication.
  • the MME may receive, from the HSS, a second indication indicating that both voice and SMS for the UE over the PDN connection are registered.
  • the MME may trigger a process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the MME may release the SGs association during a combined TAU procedure by transmitting an EPS Tracking Area Update (TAU) Accept message only with an indication e.g. “CS Domain Not Available” to the UE and an International Mobile Subscriber Identity (IMSI) Detach Indication to the MSC; then, the MSC resources may be released, and less MSC nodes are needed in the network. Subsequently, both the UE’s voice call and SMS services may use the IMS PDN connection over the PS data, which will be described in detail later with reference to FIG. 4.
  • TAU EPS Tracking Area Update
  • IMSI International Mobile Subscriber Identity
  • the second indication may be included in an IDR message that is transmitted from the HSS to the MME.
  • the second indication may include an information element indicating “Voice and SMS over IMS PDN Registered” , which may be represented by a bit that is set in IDR-Flags. Table 1 presented previously may be referred to for an exemplary change in the IDR-Flags.
  • the HSS may autonomously determine the status of the registration of both the voice and the SMS (i.e., the IMS registration status) for the UE over the IMS PDN connection based on the first indication received from the MSC, and transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the MME may autonomously determine the status of the registration of both the voice and the SMS (i.e., the IMS registration status) for the UE over the IMS PDN connection based on the first indication received from the MSC, and transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the HSS may determine the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection, depending on an notification from the MME.
  • the method 300 may further include step S301, in which the MME transmits, to the HSS, a third indication notifying the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the third indication may be included in a NOR message that is transmitted from the MME to the HSS.
  • the third indication may include an information element indicating that the SGs association between the MME and the MSC is setup for the voice and/or the SMS of the UE, e.g. indicating “CS Service on SGs Ready” , which may be represented by a bit that is set in NOR-Flags. Table 2 presented previously may be referred to for an exemplary change in the NOR-Flags.
  • the HSS may obtain the first indication indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful; and determine that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication.
  • the MME may receive, from the HSS, a second indication indicating that both voice and SMS for the UE over the PDN connection are registered; and in step S305, the MME may trigger a process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the second indication may be included in the IDR message like what has been described previously in the exemplary embodiment in which the HSS autonomously determine the IMS registration status of the UE without depending on the notification from the MME.
  • the second indication may also be included in a Notify Answer message in a similar way with the case of including the second indication in the IDR message.
  • the Notify Answer message is received by the MME from the HSS in response to the NOR message transmitted by the MME.
  • the Notify Answer message carrying the second indication is received by the MME, after the HSS performs the step of obtaining the first indication indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful, and determining that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ based on the obtained first indication.
  • the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC upon receiving the Notify Answer message, without the IDR message from the HSS to the MME and an Insert Subscriber Data Answer message from the MME to the HSS.
  • inter-MME mobility may occur when the HSS has not transmitted, to the old MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or the old MME has not triggered the process of releasing the SGs association for the UE between the old MME and the MSC, e.g., before UE is informed that “CS domain not available” in old MME, so that the new MME may receive information related to both the SG association and the IMS PDN connection.
  • the MME as a new MME, needs to notify the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the MME may perform the steps S301, S303 and S305, so that the SGs association for the UE between the MME and the MSC may be released.
  • FIG. 4 an exemplary signaling sequence diagram of releasing an SGs association between an MME and an MSC according to an exemplary embodiment of the present disclosure will be described with reference to FIG. 4, in which the method 200 at the HSS and the method 300 at the MME for releasing an SGs association between an MME and an MSC according to exemplary embodiments of the present disclosure are applied.
  • the second indication indicating that both voice and SMS for the UE over the PDN connection are registered is included in the IDR message. It should be understood that although not shown, the skilled in the art may contemplate another signaling sequence diagram in which the second indication is included in the Notify Answer message.
  • the UE In S4-1, the UE, supporting both voice and SMS over PS data, initiates combined Attach/TAU in MME, has successful combined registration with the MSC through the MME, and an SGs association between the MME and the MSC is setup; and the MME transmits, to UE, e.g., a “support Voice over PS” bit in a Registration Accept message, which may an Attach/TAU Accept message.
  • the UE initiates an IMS PDN connectivity procedure, and an IMS PDN connection is setup successfully.
  • the MME transmits a NOR message with e.g. a new Notify flag: "CS service on SGs Ready" to notify the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • a Notify Answer message is transmitted by the HSS to the MME in response to the NOR message received by the HSS.
  • the procedure proceeds with S4-5, in which the IMS service registration including both voice and SMS over the IMS PDN connection is finished between the IMS server and the HSS, e.g., the HSS receives, from the IMS server, a first indication indicating that the registration of both voice and SMS for the UE over the IMS PDN connection is successful.
  • the HSS determine that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication; and transmits, via e.g., an IDR message to the MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered.
  • the second indication include an information element indicating “Voice and SMS over IMS PDN Registered” , which may be represented by a bit that is set in IDR-Flags.
  • an Insert Subscriber Data Answer message is transmitted by the MME to the HSS in response to the IDR message received by the MME from the HSS.
  • the MME in response to the received second indication, the MME triggers IMSI Detach to UE to release UE′s SGs association.
  • the MME transmits an IMSI Detach message to the UE to release UE′s SGs association.
  • the UE transmits a Combined TAU Request message to the MME.
  • the MME responds to the UE with an EPS TAU Accept message with e.g., CC#18 "CS domain not available" . Then, the UE won′t use the SGs interface but uses the IMS PDN connection for the voice and/or the SMS.
  • the MME transmits an IMSI Detach Indication to the MSC to release the SGs resource at the MSC side.
  • the signaling although denoted by numbers in a sequential order, may not be necessarily transmitted sequentially.
  • S4-11 and S4-12 may not be performed in a particular order here.
  • FIG. 5 schematically shows a block diagram of an HSS 500 according to an exemplary embodiment of the present disclosure.
  • the HSS 500 in FIG. 5 may perform the method 200 as described previously with reference to FIG. 2. Accordingly, some detailed description on the HSS 500 may refer to the corresponding description of the method 200 in FIG. 2 and the signaling sequence diagram of FIG. 4 as previously discussed, and thus will be omitted here for simplicity.
  • the HSS 500 may include an obtaining unit 501 and a transceiving unit 503.
  • the HSS may autonomously determine the status of the registration of both the voice and the SMS (i.e., the IMS registration status) for the UE over the IMS PDN connection based on the first indication received from the MSC, and transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the MME may autonomously determine the status of the registration of both the voice and the SMS (i.e., the IMS registration status) for the UE over the IMS PDN connection based on the first indication received from the MSC, and transmit, to the MME, the second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger the process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the obtaining unit 501 may be configured to obtain a first indication indicating that registration of both voice and SMS for the UE over the IMS PDN connection is successful.
  • the obtaining unit 501 may be configured to obtain the first indication from the IMS server.
  • the HSS 500 may further include a determination unit (not shown) , which may be configured to determine that the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection is ‘Registered’ , based on the obtained first indication.
  • a determination unit not shown
  • the transceiving unit 505 may be configured to transmit, to the MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, so that the MME may trigger a process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the second indication may be included in an IDR message that is transmitted from the HSS to the MME.
  • the second indication may include an information element indicating “Voice and SMS over IMS PDN Registered” , which may be represented by a bit that is set in IDR-Flags. Table 1 presented previously may be referred to for an exemplary change in the IDR-Flags.
  • the HSS may determine the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection, depending on an notification from the MME.
  • the transceiving unit 503 may be further configured to receives, from the MME, a third indication notifying the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the third indication may be included in an NOR message that is transmitted from the MME to the HSS.
  • the third indication may include an information element indicating that the SGs association between the MME and the MSC is setup for the voice and/or the SMS of the UE, e.g. indicating “CS Service on SGs Ready” , which may be represented by a bit that is set in NOR-Flags. Table 2 presented previously may be referred to for an exemplary change in the NOR-Flags.
  • the second indication may be included in the IDR message, like what has been described previously in the exemplary embodiment in which the HSS autonomously determine the IMS registration status of the UE without depending on the notification from the MME.
  • the second indication may also be included in a Notify Answer message in a similar way with the case of including the second indication in the IDR message.
  • the third indication is received from the MME during inter-MME mobility from an old MME to the MME, in any of cases where:
  • the HSS has not transmitted, to the old MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or
  • the old MME has not triggered a process of releasing the SGs association for the UE between the old MME and the MSC.
  • FIG. 6 schematically shows a block diagram of an HSS 600 according to an exemplary embodiment of the present disclosure.
  • the HSS 600 in FIG. 6 may perform the method 200 as described previously with reference to FIG. 2. Accordingly, some detailed description on the HSS 600 may refer to the corresponding description of the method 200 in FIG. 2 and the signaling sequence diagrams of FIG. 4 as previously discussed, and thus will be omitted here for simplicity.
  • the HSS 600 includes at least one processor 601 and at least one memory 603.
  • the at least one processor 601 includes e.g., any suitable CPU (Central Processing Unit) , microcontroller, DSP (Digital Signal Processor) , etc., capable of executing computer program instructions.
  • the at least one memory 603 may be any combination of a RAM (Random Access Memory) and a ROM (Read Only Memory) .
  • the at least one processor memory 603 may also include persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, or solid state memory or even remotely mounted memory.
  • the at least one memory 603 stores instructions executable by the at least one processor 601.
  • the instructions when loaded from the at least one memory 603 and executed on the at least one processor 601, may cause the HSS 600 to perform the actions, e.g., of the procedures as described earlier respectively in conjunction with FIG. 2 with reference to the signaling sequence diagram of FIG. 4 as previously discussed, and thus will be omitted here for simplicity.
  • the instructions when loaded from the at least one memory 603 and executed on the at least one processor 601, may cause the HSS 600 to:
  • the first indication may be obtained from the IMS server.
  • the second indication may be included in an IDR message that is transmitted from the HSS to the MME.
  • the second indication may include an information element indicating “Voice and SMS over IMS PDN Registered” , which may be represented by a bit that is set in IDR-Flags. Table 1 presented previously may be referred to for an exemplary change in the IDR-Flags.
  • the instructions when loaded from the at least one memory 603 and executed on the at least one processor 601, may cause the HSS 600 to:
  • the first indication may be obtained from the IMS server.
  • the second indication may be included in the IDR message, like what has been described previously in the exemplary embodiment in which the HSS autonomously determine the IMS registration status of the UE without depending on the notification from the MME.
  • the second indication may also be included in a Notify Answer message in a similar way with the case of including the second indication in the IDR message.
  • the third indication is received from the MME during inter-MME mobility from an old MME to the MME, in any of cases where:
  • the HSS has not transmitted, to the old MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or
  • the old MME has not triggered a process of releasing the SGs association for the UE between the old MME and the MSC.
  • FIG. 7 schematically shows a block diagram of an MME 700 according to an exemplary embodiment of the present disclosure.
  • the MME 700 in FIG. 7 may perform the method 300 as described previously with reference to FIG. 3. Accordingly, some detailed description on the MME 700 may refer to the corresponding description of the method 300 in FIG. 3 and the signaling sequence diagram of FIG. 4 as previously discussed, and thus will be omitted here for simplicity.
  • the MME 700 may include a transceiving unit 701 and a triggering unit 703.
  • the HSS may autonomously determine the status of the registration of both the voice and the SMS (i.e., the IMS registration status) for the UE over the IMS PDN connection based on the first indication received from the MSC.
  • the transceiving unit 701 is configured to receive, from the HSS, a second indication indicating that both voice and SMS for the UE over the PDN connection are registered.
  • the triggering unit 703 is configured to trigger a process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the second indication may be included in an IDR message that is transmitted from the HSS to the MME.
  • the second indication may include an information element indicating “Voice and SMS over IMS PDN Registered” , which may be represented by a bit that is set in IDR-Flags. Table 1 presented previously may be referred to for an exemplary change in the IDR-Flags.
  • the HSS may determine the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection, depending on an notification from the MME.
  • the transceiving unit 701 is further configured to transmit, to the HSS, a third indication notifying the HSS of determining the status of the registration of both the voice and the SMS for the UE over the IMS PDN connection.
  • the third indication may be included in a NOR message that is transmitted from the MME to the HSS.
  • the third indication may include an information element indicating that the SGs association between the MME and the MSC is setup for the voice and/or the SMS of the UE, e.g. indicating “CS Service on SGs Ready” , which may be represented by a bit that is set in NOR-Flags. Table 2 presented previously may be referred to for an exemplary change in the NOR-Flags.
  • the second indication may be included in the IDR message, like what has been described previously in the exemplary embodiment in which the HSS autonomously determine the IMS registration status of the UE without depending on the notification from the MME.
  • the second indication may also be included in a Notify Answer message in a similar way with the case of including the second indication in the IDR message.
  • the third indication is received from the MME during inter-MME mobility from an old MME to the MME, in any of cases where:
  • the HSS has not transmitted, to the old MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or
  • the old MME has not triggered a process of releasing the SGs association for the UE between the old MME and the MSC.
  • FIG. 8 schematically shows a block diagram of an MME 800 according to an exemplary embodiment of the present disclosure.
  • the MME 800 in FIG. 8 may perform the method 300 as described previously with reference to FIG. 3. Accordingly, some detailed description on the MME 800 may refer to the corresponding description of the method 300 in FIG. 3 and the signaling sequence diagram of FIG. 4 as previously discussed, and thus will be omitted here for simplicity.
  • the MME 800 includes at least one processor 801 and at least one memory 803.
  • the at least one processor 801 includes e.g., any suitable CPU (Central Processing Unit) , microcontroller, DSP (Digital Signal Processor) , etc., capable of executing computer program instructions.
  • the at least one memory 803 may be any combination of a RAM (Random Access Memory) and a ROM (Read Only Memory) .
  • the at least one processor memory 803 may also include persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, or solid state memory or even remotely mounted memory.
  • the at least one memory 803 stores instructions executable by the at least one processor 801.
  • the instructions when loaded from the at least one memory 803 and executed on the at least one processor 801, may cause the executing entity 800 to perform the actions, e.g., of the procedures as described earlier respectively in conjunction with FIG. 3 with reference to the signaling sequence diagram of FIG. 4 as previously discussed, and thus will be omitted here for simplicity.
  • the instructions when loaded from the at least one memory 803 and executed on the at least one processor 801, may cause the MME 800 to receive, from the HSS, a second indication indicating that both voice and SMS for the UE over the PDN connection are registered; and trigger a process of releasing the SGs association for the UE between the MME and the MSC, in response to the received second indication.
  • the first indication may be obtained from the IMS server.
  • the second indication may be included in an IDR message that is transmitted from the HSS to the MME.
  • the second indication may include an information element indicating “Voice and SMS over IMS PDN Registered” , which may be represented by a bit that is set in IDR-Flags. Table 1 presented previously may be referred to for an exemplary change in the IDR-Flags.
  • the instructions when loaded from the at least one memory 803 and executed on the at least one processor 801, may cause the MME 800 to:
  • the first indication may be obtained from the IMS server.
  • the second indication may be included in the IDR message, like what has been described previously in the exemplary embodiment in which the HSS autonomously determine the IMS registration status of the UE without depending on the notification from the MME.
  • the second indication may also be included in a Notify Answer message in a similar way with the case of including the second indication in the IDR message.
  • the third indication is received from the MME during inter-MME mobility from an old MME to the MME, in any of cases where:
  • the HSS has not transmitted, to the old MME, a second indication indicating that both the voice and the SMS for the UE over the IMS PDN connection are registered, or
  • the old MME has not triggered a process of releasing the SGs association for the UE between the old MME and the MSC.
  • the present disclosure also provides at least one computer program product in the form of a non-volatile or volatile memory, e.g., a non-transitory computer readable storage medium, an Electrically Erasable Programmable Read-Only Memory (EEPROM) , a flash memory and a hard drive.
  • the computer program product includes a computer program.
  • the computer program includes: code/computer readable instructions, which when executed by the at least one processor 601 causes the HSS 600 to perform the actions, e.g., of the procedure described earlier in conjunction with FIG. 2; or code/computer readable instructions, which when executed by the at least one processor 801 causes the MME 800 to perform the actions, e.g., of the procedures described earlier respectively in conjunction with FIG. 3.
  • the computer program product may be configured as a computer program code structured in computer program modules.
  • the computer program modules could essentially perform the actions of the flow illustrated in any of FIGS. 2 to 4.
  • the processor may be a single CPU (Central processing unit) , but could also include two or more processing units.
  • the processor may include general purpose microprocessors; instruction set processors and/or related chips sets and/or special purpose microprocessors such as Application Specific Integrated Circuit (ASICs) .
  • the processor may also include board memory for caching purposes.
  • the computer program may be carried by a computer program product connected to the processor.
  • the computer program product may include a non-transitory computer readable storage medium on which the computer program is stored.
  • the computer program product may be a flash memory, a Random-access memory (RAM) , a Read-Only Memory (ROM) , or an EEPROM, and the computer program modules described above could in alternative embodiments be distributed on different computer program products in the form of memories.
  • RAM Random-access memory
  • ROM Read-Only Memory
  • EEPROM Electrically Erasable programmable read-only memory

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Abstract

La présente divulgation concerne des procédés, des entités et un support lisible par ordinateur pour la divulgation d'association SGs avec une MSC. Le procédé au niveau d'un HSS comprend les étapes consistant à : obtenir une première indication selon laquelle l'inscription simultanée pour la voix et pour un service de messagerie courte (SMS) d'un équipement utilisateur (UE) sur une connexion de réseau de données par paquets (PDN) de sous-système multimédia par IP (IMS) a bien réussi ; et la transmission, à une entité de gestion de mobilité (MME) desservant l'UE, d'une deuxième indication selon laquelle l'inscription simultanée pour la voix et le SMS de l'UE sur la connexion PDN IMS a bien réussi.
PCT/CN2020/117486 2020-09-24 2020-09-24 Procédés, entités et support lisible par ordinateur pour la divulgation d'association sgs entre mme et msc WO2022061659A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN102273296A (zh) * 2011-02-01 2011-12-07 华为技术有限公司 资源释放的处理方法、通信设备、通信系统及用户设备
CN102781068A (zh) * 2011-05-13 2012-11-14 华为终端有限公司 设备触发方法及网元设备
WO2015058393A1 (fr) * 2013-10-25 2015-04-30 华为技术有限公司 Procede, dispositif et systeme de communication
WO2020147112A1 (fr) * 2019-01-18 2020-07-23 Telefonaktiebolaget Lm Ericsson (Publ) Nœud de réseau, équipement utilisateur et procédés exécutés dans un réseau de communication sans fil

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CN102781068A (zh) * 2011-05-13 2012-11-14 华为终端有限公司 设备触发方法及网元设备
WO2015058393A1 (fr) * 2013-10-25 2015-04-30 华为技术有限公司 Procede, dispositif et systeme de communication
WO2020147112A1 (fr) * 2019-01-18 2020-07-23 Telefonaktiebolaget Lm Ericsson (Publ) Nœud de réseau, équipement utilisateur et procédés exécutés dans un réseau de communication sans fil

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