CN114845276B - Method and platform for realizing network capability opening - Google Patents
Method and platform for realizing network capability opening Download PDFInfo
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- CN114845276B CN114845276B CN202210409955.7A CN202210409955A CN114845276B CN 114845276 B CN114845276 B CN 114845276B CN 202210409955 A CN202210409955 A CN 202210409955A CN 114845276 B CN114845276 B CN 114845276B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/50—Service provisioning or reconfiguring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/60—Subscription-based services using application servers or record carriers, e.g. SIM application toolkits
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- 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
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- 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
- H04W8/205—Transfer to or from user equipment or user record carrier
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a method for realizing network capability opening, which comprises the steps of sending a request to obtain an S-CSCF network element response through a NEF network element interface when a user terminal UE subscribes, obtaining UE information data of the S-CSCF network element, storing the data in the NEF network element interface, inquiring all network elements and external network elements at one time without frequently starting subscription when the network elements want to access subscription information, enabling the UE to initiate subscription request, exposing the interface to the S-CSCF network element in IMS through the NEF network element interface, calling the S-CSCF network element, responding the request, sending the stored data to the NEF network element interface, storing the stored data to a subscriber through NF, initiating the next subscription and updating the user registration state modified in the S-CSCF network element, and friendly experience for external entities.
Description
Technical Field
The invention relates to the field of communication, in particular to a method and a platform for realizing network capability opening.
Background
IMS (IP Multimedia Subsystem) is an abbreviation for IP multimedia subsystem, 3GPPP (the 3) rd Generation Partnership Project) is formally set forth in UMTS (Universal Mobile Telecommunications System) R5 standard edition.
The network architecture of the IMS in 3GPP is divided into three layers from bottom to top, a transport and access layer, a control layer, a data and application layer, and the core of the control layer is a CSCF entity, where an S-CSCF (serving CSCF) is a core session management node of the IMS, responsible for all session control functions, and a monitoring event function aims to monitor specific events in the 3GPP system and report such monitoring event information through the NEF.
The NEF capability opening supports the external exposure of network capability, and the externally exposed service capability mainly comprises a monitoring function, a supply capability, a policy/charging function and an analysis reporting function. The NEF and the third party application adopt a JSON/XML protocol, such as HTTPS/HTTP. When interacting with the network element, a corresponding protocol conversion work is required.
Under IMS architecture, when user terminal UE wants to subscribe UE information, UE entity initiates subscription to UE information, S-CSCF network element returns UE information to subscriber after judging, monitors user registration state information in S-CSCF network element, when user state information changes, S-CSCF network element sends NOTIFY information to all subscribers, and informs all subscribers of change of user state information.
In the prior art, when a UE entity initiates subscription to information such as a user registration state, an S-CSCF network element determines whether a user is registered according to an identifier in a PAI message header, and then the S-CSCF network element returns NOTIFY information to the UE entity to NOTIFY the registration state and the like of the user, but the active subscription queries only the current data class once, and cannot query all the current data class, so that the information is redundant, and a frequent access interface is not friendly to UE operation.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for realizing network capability opening, which is characterized in that an interface is exposed to the call of an S-CSCF network element in IMS through a NEF network element interface, all UE information is obtained and stored in the NEF network element interface, and when each network element and an external network element want to access subscription information, the network element can be queried at one time without frequently initiating subscription.
In order to solve the technical problems and achieve the aim of the invention, the invention is realized by the following technical scheme:
a method for implementing network capability openness, the method comprising:
the user equipment UE sends a request to the S-CSCF network element through a NEF network element interface, and the NEF network element interface sends a request for subscribing the event in the S-CSCF network element in the request;
the S-CSCF network element acquires information of User Equipment (UE) and judges whether event subscription is authorized by IMS or not, and whether a user state is registered or not;
if the user is registered, the S-CSCF network element returns a confirmation message, then the S-CSCF network element sends a message to the NEF network element interface for responding, the user registration state is notified, the S-CSCF network element responds and replies to the NEF network element interface, and the UE information of the user equipment is sent to the NEF network element interface for storage. And the UE end of the user equipment exposes an interface to the S-CSCF network element in the IMS through the NEF network element interface to be called, so as to obtain UE information.
After receiving the subscription information request, the S-CSCF network element carries out judgment identification, and after obtaining the information, sends a message to the subscriber, namely the user equipment UE, and transmits the information, and the message responded is obtained through the NEF network element interface exposure information, so as to manage the user data.
When the state of the user registration information is changed, the S-CSCF network element continuously sends the modified and changed UE information to the UE, namely the subscriber, and stores the modified and changed UE information in the S-CSCF network element, and when the next time the UE initiates the subscription, the S-CSCF network element responds to the NEF network element interface and updates the stored UE information of the NEF network element interface.
Further, the NEF network element interface request defines the type of the requested report, and the subscribed receiving event can be one or a plurality of receiving events, and is identified by the event ID.
Further, the method for judging whether the user state is registered specifically includes: the S-CSCF network element needs to determine whether the identifier in the PAI header file is already registered on the S-CSCF network element when the S-CSCF network element receives an event subscription. The subscription information is sent only if the user equipment UE has registered on the S-CSCF network element, otherwise the S-CSCF network element refuses to send the subscription information.
Further, the UE information includes: PLMN (Public Land Mobile Network) public land Mobile Network, IMPU (IP Multimedia Public Identity) IP multimedia public identity, current S-CSCF slice information, visited domain (P-Visited-Network-ID), terminal IP, port.
Further, after the information acquisition is completed, the S-CSCF network element sends a NOTIFY message to the User Equipment (UE) of the subscriber; the S-CSCF network element supports shared use of a certain public identity IMPU among multiple private identities IMPI.
Further, when the user equipment UE communicates with the S-CSCF network element through the NEF network element interface, the SIP protocol and the SDP protocol are combined for application; the NEF network element interface and the IMS adopt a JSON/XML protocol, such as HTTPS/HTTP;
when the NEF network element interface sends a request to the IMS, the S-CSCF network element checks basic service data of a user in the IMS session process of the user and then authorizes, and after authorization, the S-CSCF network element subscribes to contents according to the SIP request, and the S-CSCF network element checks media parameters of SDP in the SIP request and limits the subscribed contents.
The invention also provides a network capability open platform, comprising:
interface transceiver module: the method comprises the steps of receiving a sending request of User Equipment (UE) and sending the sending request to an S-CSCF network element; and receiving the user registration state sent by the S-CSCF network element, and sending the UE information to the NEF network element interface for storage. The UE side exposes an interface to the S-CSCF network element in the IMS through the NEF network element interface to be called, and UE information is obtained.
A first storage module: and the network element interface is positioned in the NEF network element interface and is used for storing the UE information.
And a second storage module: and the UE information is positioned in the S-CSCF network element and used for storing updated UE information when the state of the user registration information is changed.
User registration status verification module: for obtaining information of the UE, determining whether the event subscription has been authorized by the IMS, whether the user status has been registered,
if the user is registered, the S-CSCF network element returns a confirmation message, then the S-CSCF network element sends a message to the NEF network element interface to respond, the user registration state is notified, the S-CSCF network element responds and replies to the NEF network element interface, user Equipment (UE) information is sent to the NEF network element interface for storage, and the UE end exposes the interface to the S-CSCF network element in the IMS through the NEF network element interface to be called, so that the UE information is obtained;
after receiving the subscription information request, the S-CSCF network element carries out judgment identification, and after the information is obtained, a message is also sent to a subscriber, namely User Equipment (UE), the information is transferred, the information is exposed through an NEF network element interface to obtain a response message, and user data is managed;
when the state of the user registration information is changed, the S-CSCF network element continuously sends the modified and changed UE information to the UE, namely the subscriber, and stores the modified and changed UE information in the S-CSCF network element, and when the next time the UE initiates the subscription, the S-CSCF network element responds to the NEF network element interface and updates the stored UE information of the NEF network element interface.
Further, the NEF network element interface is connected in a bus manner with all Network Functions (NF) based on the servitization architecture.
Further, the northbound interface in the NEF network element interface is an open API interface, and the rest are southbound interfaces that are interfaced with the 5 GC.
Further, an internal SBA protocol is adopted between the NEF network element interface and other network elements.
Further, when the S-CSCF network element accepts the request, it needs to identify the user identity, where the user has a private identity IMPI and a public identity IMPU, and uses the SIP-URI to identify the user.
The invention also provides a computer readable storage medium storing a computer program which when executed by a processor implements the above-described network capability opening implementation method.
On the basis of the subscription initiated by the UE entity, the invention exposes the interface to the call of the S-CSCF network element in the IMS through the NEF network element interface, acquires all UE information, stores the UE information in the NEF network element interface, can inquire once when each network element and the external network element want to access the subscription information, does not need to frequently initiate the subscription, and provides friendly experience for the external entity class.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a flowchart of a subscription and notification generation operation by an S-CSCF network element according to an embodiment of the present application;
fig. 2 is a schematic diagram of a network capability open platform according to an embodiment of the present application.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the disclosure by way of illustration, and only the components related to the disclosure are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
The implementation method for opening the network capability comprises the following steps, in combination with the description of fig. 1:
s1: user Equipment (UE) sends a request to an S-CSCF network element through a NEF network element interface;
the NEF network element interface sends a request to Subscribe to events in the S-CSCF network element in an IMS_reg_EventExponsure_Subscribe request, which defines the type of report requested. The subscribed-to receive event may be one or more, identified by an event ID.
S2: the S-CSCF network element acquires the information of the user equipment UE and judges whether the event subscription is authorized by the IMS or not, and whether the user state is registered or not.
The method for judging whether the user state is registered specifically comprises the following steps: the querying service session control device, the S-CSCF element needs to determine whether the identifier in the PAI header file is already registered on the S-CSCF element when the S-CSCF element receives a subscription. The subscription information is sent only if the user equipment UE has registered on the S-CSCF network element, otherwise the S-CSCF network element refuses to send the subscription information.
S3: if the user is registered, the S-CSCF network element returns a confirmation message, then the S-CSCF network element sends a NOTIFY message to the NEF network element interface for IMS_reg_EventExposure_subscore response, the user registration state is notified, and the S-CSCF network element responds and replies the NEF network element interface to send User Equipment (UE) information to the NEF network element interface for storage. And the user equipment UE end exposes an interface to the S-CSCF network element in the IMS through the NEF network element interface to be called, so as to obtain the user equipment UE information.
The user equipment UE information includes the following information:
(1) PLMN (Public Land Mobile Network) public land mobile network. The network must be interconnected with the Public Switched Telephone Network (PSTN) to form a communication network of the whole area or country scale, plmn=mcc+mnc, for example, 46000, 46002 for chinese mobile, 46001 for chinese communication, 46003 for chinese telecommunication, PLMN is a wireless communication system intended for land-based riding vehicle mobile or walking users. For a particular terminal, it is often necessary to maintain several different types of PLMN lists, each with multiple PLMNs.
(2) IMPU (IP Multimedia Public Identity) IP multimedia public identity. IP multimedia public identity is used when IMS users want to communicate with other users. IMS allows binding of multiple IMPUs on one IMPI. IMPU may also be shared with other phones.
IMPI (IP multimedia private identity), which is a global identity permanently assigned by the primary network operator, can be used for registration, authentication, management, and billing purposes. Each IMS user may have multiple IMPIs (equivalent to IMSIs)
User state, user number in registration state, cancel registration type, IMS call flow. The user equipment UE checks the AUTN, and after the AUTN is successful, the mobile phone checks the network successfully. And calculates RES by RAND and the shared key.
(3) Current S-CSCF network element slice information. When the user equipment UE registers with the PLMN through the access type, if the user equipment UE has either or both of the following: "configured NSSAI" for the PLMN, and "allowed NSSAI" for the PLMN and access type. The user equipment UE shall provide a "requested nsai" to the network for use by the registration procedure of the user equipment UE, the "requested nsai" containing S-nsai corresponding to the network slice the user equipment UE wishes to register.
(4) Current PANI (P-Access-Network-ID). Access Network Information uses an IMS control channel protocol between a User Equipment (UE) and an IMS Control Channel Function (ICCF) and Session Initiation Protocol (SIP) interface (and between the ICCF, call session control function and application server) to support indications of Circuit Switched (CS) Access with P-Access-Network-Information. The S-CSCF network element may use the indication to achieve different purposes such as routing decisions, charging and presence information.
(5) A Visited-domain (P-Visited-Network-ID). The entity in the IMS core network must forward the header field in the signalling domain, and when the signalling leaves the signalling domain, the last entity module must delete the header field. The S-CSCF is cooperated with the header field when forwarding the signaling, when the S-CSCF network element finds that the signaling request does not belong to the home network and should be forwarded to other visiting networks, the S-CSCF network element is used as the last entity in the signaling domain, and the header field is deleted from the signaling and forwarded.
(6) Terminal ip, port. The IMS terminal address and the port IP address form a network address plus a host address, which is generally the IP of the visited network where the P-CSCF network element is located.
Further, the user equipment UE uses SIP protocol and SDP protocol in combination when communicating with the S-CSCF network element through the NEF network element interface. The SIP protocol, session initiation protocol, is a signaling protocol that controls the initiation, modification, and termination of interactive multimedia sessions. SDP is called session description protocol, which is parasitic inside SIP messages, i.e. Body, for negotiating the IP addresses, ports and media coding, bandwidth etc. to be used by the RTP protocol. In communication SIP itself does not define the type of session set up, but only how to manage the session, SDP conveys media stream information in media sessions, allowing the recipients of the session description to participate in the session. When the SIP initiates a session, firstly, an INVITE is sent to indicate that a calling user initiates a session request, other users are invited to join the session, a called side sends 180Ringing to indicate that an INVITE message has been sent to the called side, notifies the calling side that the called side has Ringing, and sends 200 OK information for SIP INVITE messages, which are used as final response, and both sides of the content part of the SDP have been exchanged.
S4: after receiving the subscription information request, the S-CSCF network element carries out judgment identification, after obtaining the information, the S-CSCF network element also sends a NOTIFY message to the subscriber, namely the user equipment UE end, transmits IMS_reg_EventExposure_info, and obtains a response message by exposing the information through the NEF network element interface, manages the user data, and the S-CSCF network element supports sharing use of a certain IMPU in a plurality of IMPIs.
Further, a JSON/XML protocol is adopted between the NEF network element interface and the IMS, such as HTTPS/HTTP is used.
S5: when the state of the user registration information is changed, the S-CSCF network element continuously sends the User Equipment (UE) information of the User Equipment (UE) after the change to the subscriber, and stores the information in the S-CSCF network element, and when the User Equipment (UE) initiates the subscription next time, the user equipment responds to the NEF network element interface and updates the stored UE information of the NEF network element interface.
The embodiment of the invention also provides a network capability open platform, as shown in fig. 2, the platform comprises:
interface transceiver module: the method comprises the steps of receiving a sending request of User Equipment (UE) and sending the sending request to an S-CSCF network element; and receiving the user registration state sent by the S-CSCF network element, and sending the UE information of the user equipment to the NEF network element interface for storage. And the user equipment UE end exposes an interface to the S-CSCF network element in the IMS through the NEF network element interface to be called, so as to obtain the user equipment UE information.
A first storage module: and the network element interface is positioned in the NEF network element interface and is used for storing the UE information.
And a second storage module: and the user equipment UE information is positioned in the S-CSCF network element and used for storing updated user equipment UE information when the state of the user registration information is changed.
User registration status verification module: and the method is used for acquiring the information of the User Equipment (UE) and judging whether the event subscription is authorized by the IMS and whether the user state is registered.
The NEF network element interfaces are deployed in the 5GC, the NEF network element interfaces under the 5G network are connected with all Network Functions (NF) in a bus mode based on a service architecture, the S-CSCF network element under the IMS is a network element of the 4G, the north direction in the NEF is an open API interface, the rest is a south direction interface which is in butt joint with the 5GC, and an internal SBA protocol is adopted between the NEF network element interfaces and other network elements, so that corresponding protocol conversion work is needed. The IMS needs a SIP protocol, and when the 5GC interface sends a subscription request, the difference is that when the NEF network element interface sends a request to the IMS, the S-CSCF network element will check the basic service data of the user in the IMS session process of the user and then perform authorization, after the authorization, the S-CSCF network element will check the media parameters of the SDP in the SIP request according to the SIP request, and limit the subscription content, and a JSON/XML protocol is adopted between the NEF network element interface and the IMS, for example, HTTPS/HTTP is used.
The IMS network element is identified by adopting a SIP-URI mode, the network element identification SIP-URI is used for identifying the network nodes in a message header field of the SIP message, the S-CSCF network element needs to identify the user identification when receiving the request, and the user has private identification IMPI and public identification IMPU, and the user is identified by adopting the SIP-URI.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The method for realizing the network capability opening is characterized by comprising the following steps:
the user equipment UE sends a request to the S-CSCF network element through a NEF network element interface, and the NEF network element interface sends a request for subscribing the event in the S-CSCF network element in the request;
the S-CSCF network element acquires information of User Equipment (UE) and judges whether event subscription is authorized by IMS or not, and whether a user state is registered or not;
if the user is registered, the S-CSCF network element returns a confirmation message, then the S-CSCF network element sends a message to the NEF network element interface to respond, the user registration state is notified, the S-CSCF network element responds and replies to the NEF network element interface, user Equipment (UE) information is sent to the NEF network element interface for storage, and the UE end exposes the interface to the S-CSCF network element in the IMS through the NEF network element interface to be called, so that the UE information is obtained;
after receiving the subscription information request, the S-CSCF network element carries out judgment identification, and after the information is obtained, a message is also sent to a subscriber, namely User Equipment (UE), the information is transferred, the information is exposed through an NEF network element interface to obtain a response message, and user data is managed;
when the state of the user registration information is changed, the S-CSCF network element continuously sends the modified and changed UE information to the UE, namely the subscriber, and stores the modified and changed UE information in the S-CSCF network element, and when the next time the UE initiates the subscription, the S-CSCF network element responds to the NEF network element interface and updates the stored UE information of the NEF network element interface.
2. The network capability opening implementation of claim 1, wherein the NEF network element interface request defines a type of report requested, the subscribed receive event being one or more, identified by an event ID.
3. The method for implementing network capability openness according to claim 1, wherein the method for determining whether the user status is registered specifically includes: inquiring service session control equipment, and under the condition that an event subscription is received by the S-CSCF network element, judging whether the identifier in the message header file is registered on the S-CSCF network element or not by the S-CSCF network element.
4. The method for implementing network capability openness according to claim 3, wherein the UE information includes: PLMN, IMPU, current S-CSCF slicing information, visiting domain, terminal ip, port.
5. A method for implementing network capability opening according to claim 1, wherein the S-CSCF network element supports shared use of a certain public identity IMPU among a plurality of private identities IMPI.
6. The method for implementing network capability opening according to claim 5, wherein the user equipment UE uses SIP protocol and SDP protocol in combination when communicating with the S-CSCF network element through the NEF network element interface; and a JSON/XML protocol is adopted between the NEF network element interface and the IMS.
7. The network capability opening implementation method according to claim 6, wherein the S-CSCF network element examines media parameters of the SDP in the SIP request and limits subscription content.
8. A network capability open platform, comprising:
interface transceiver module: the method comprises the steps of receiving a sending request of User Equipment (UE) and sending the sending request to an S-CSCF network element; receiving a user registration state sent by an S-CSCF network element, sending UE information to a NEF network element interface for storage, and exposing an interface by the UE end through the NEF network element interface to be called by the S-CSCF network element in the IMS to obtain the UE information;
a first storage module: the network element interface is positioned in the NEF network element interface and is used for storing UE information;
and a second storage module: the system is positioned in the S-CSCF network element and is used for storing updated UE information when the state of the user registration information is changed;
user registration status verification module: for obtaining information of the UE, determining whether the event subscription has been authorized by the IMS, whether the user status has been registered,
if the user is registered, the S-CSCF network element returns a confirmation message, then the S-CSCF network element sends a message to the NEF network element interface to respond, the user registration state is notified, the S-CSCF network element responds and replies to the NEF network element interface, user Equipment (UE) information is sent to the NEF network element interface for storage, and the UE end exposes the interface to the S-CSCF network element in the IMS through the NEF network element interface to be called, so that the UE information is obtained;
after receiving the subscription information request, the S-CSCF network element carries out judgment identification, and after the information is obtained, a message is also sent to a subscriber, namely User Equipment (UE), the information is transferred, the information is exposed through an NEF network element interface to obtain a response message, and user data is managed;
when the state of the user registration information is changed, the S-CSCF network element continuously sends the modified and changed UE information to the UE, namely the subscriber, and stores the modified and changed UE information in the S-CSCF network element, and when the next time the UE initiates the subscription, the S-CSCF network element responds to the NEF network element interface and updates the stored UE information of the NEF network element interface.
9. The network capability open platform of claim 8 wherein north of the NEF element interfaces is an open API interface and the remainder are south interfaces interfacing with 5 GC.
10. A computer readable storage medium storing a computer program, which when executed by a processor implements the network capability opening implementation method according to any of claims 1-7.
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