CN108243403B - Method for controlling VoLTE user to register S-CSCF and I-CSCF network element - Google Patents

Method for controlling VoLTE user to register S-CSCF and I-CSCF network element Download PDF

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CN108243403B
CN108243403B CN201611218710.7A CN201611218710A CN108243403B CN 108243403 B CN108243403 B CN 108243403B CN 201611218710 A CN201611218710 A CN 201611218710A CN 108243403 B CN108243403 B CN 108243403B
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network element
cscf
cscf network
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CN108243403A (en
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刘挺昕
刘遂江
黄梅英
张聪
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China Mobile Group Henan Co Ltd
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China Mobile Group Henan Co Ltd
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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
    • H04W8/08—Mobility data transfer
    • H04W8/14—Mobility data transfer between corresponding nodes
    • 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
    • H04L65/10—Architectures or entities
    • H04L65/1046—Call controllers; Call servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • 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

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Abstract

The invention discloses a method for controlling a VoLTE user to register S-CSCF and an I-CSCF network element, wherein the method comprises the following steps: after receiving the REGISTER message, an I-CSCF network element of an inquiry call session control function of the IMS network acquires a target IMSI of VoLTE User Equipment (UE) carried by the REGISTER message; the I-CSCF network element determines a target S-CSCF network element corresponding to the target IMSI based on a corresponding relation between a pre-configured IMSI and a host name of a service call session control function S-CSCF network element of the IMS network; and the I-CSCF network element sends the REGISTER message to the target S-CSCF network element so as to realize the registration of the VoLTE user equipment UE on the target S-CSCF network element. Compared with the prior art, the invention controls the target VoLTE user or the user group to be registered on the appointed S-CSCF according to the corresponding relation between the pre-configured IMSI information and the S-CSCF host name, and enhances the flexibility of the VoLTE user to be registered on the S-CSCF.

Description

Method for controlling VoLTE user to register S-CSCF and I-CSCF network element
Technical Field
The invention relates to the technical field of communication, in particular to a method for controlling a VoLTE user to register an S-CSCF and an I-CSCF network element.
Background
VoLTE (Voice over LTE, Voice over long term evolution) is an IMS (Internet Protocol Multimedia Subsystem) based Voice service. The S-CSCF (Serving-Call Session Control Function) is in a core position in IMS network Session Control, receives a registration request forwarded from a visited network through an I-CSCF (Interrogating-Call Session Control Function), and performs user authentication in cooperation with an HSS (Home Subscriber Server). And downloading the service data signed by the user from the HSS. The basic registration process of User Equipment (UE) in an IMS network is realized.
In the basic registration process, the UE reads the USIM (Universal Subscriber Identity Module) card information to obtain IMSI (International Mobile Subscriber Identity Number), derives IMPI (IP Multimedia Private Identity) and IMPU (IP Multimedia Public Identity) from the IMSI, and sends REGISTER message to the IMS visited network portal P-CSCF (Proxy Call Session Control function) to request registration. The P-CSCF queries a DNS (Domain Name System) server according to a home network Domain Name in a Request-URI (Request address) header of the REGISTER message, acquires an IP address of an I-CSCF network element of a home network entrance, and forwards the REGISTER message to the I-CSCF corresponding to the IP address. After receiving REGISTER message, I-CSCF sends UAR (User Authorization Request) message to HSS to query User registration status, requesting to obtain host name or capability set of S-CSCF. HSS receives UAR message, according to User registration information in local data base judges that User is registered, then sends UAA (User Authorization Answer) message to I-CSCF, and returns host name or capability set of S-CSCF.
In IMS, the HSS is located in the home network and is used to store all subscriber and service related data, such as: user identity, user registration state information, access parameters, service triggering information and the like; the S-CSCF is the core of the IMS, is positioned in a home network and performs session control and registration service for the user; the registration state of the user includes three types: a non-registered (registered) state in which no connection is established with the network, a registered (registered) state, and a called non-registered (unregistered) state in which a connection is established with the network but a registration procedure is not initiated by itself. When UE exits the network, for example, the mobile terminal is powered off, a user revocation request is triggered, and after the HSS receives the user revocation request, the registration state of the mobile terminal stored in the local is changed into a not registered state; when the UE completes registration, a user registration request is triggered, and after the HSS receives the user registration request, the registration state of the UE stored in the local is changed into a registered state; when the UE is called, a SAR (service allocation Request) is triggered, and after receiving the SAR message from the S-CSCF, the HSS changes the registration state of the UE stored locally to an unregistered state. Here, it is only described that when the registration state of the UE changes, the registration state is changed in the HSS according to the protocol specification, that is, the HSS knows all the changes, and specific implementation can refer to related protocols.
According to the protocol, after receiving UAR message from I-CSCF, HSS inquires the user registration information stored in local database, and determines the returned S-CSCF capability set or the host name of S-CSCF according to the current registration state of UE. If the UE has not been allocated to the host name of the S-CSCF, that is, the UE is in a not registered state, or the I-CSCF explicitly requests the S-CSCF capability, the S-CSCF capability set information is carried in the UAA and returned to the I-CSCF; otherwise, when the UE is in the registered state or unregistered state, the UE is already allocated to the S-CSCF, and the allocated S-CSCF is stored in the HSS, so that the host name information of the S-CSCF is carried in the UAA and returned to the I-CSCF at the moment.
One solution in the prior art is: when HSS returns host name of S-CSCF to I-CSCF, I-CSCF queries DNS to obtain IP address of S-CSCF according to host name of S-CSCF, and forwards REGISTER message to S-CSCF, and completes subsequent registration process.
This solution has the following problems:
an HSS (home subscriber server) needs to sign an S-CSCF (serving-call session control function) host name for each VoLTE (voice over long term evolution) user, user data are complex, and the data volume is large when batch users are adjusted; in addition, the conventional VoLTE IMS core network consists of a plurality of S-CSCF (serving-Call Session control function) POOL (Call Session control function), the service disaster recovery cannot be realized by a mode of statically signing an S-CSCF address for a user, and the load of each S-CSCF in the S-CSCFPOOL is easily uneven, so that the scheme is not adopted by the conventional network at present.
In addition, the VoLTE registration process scene is divided into an initial registration scene and a refresh registration scene, after the VoLTE user completes the initial registration (for example, the VoLTE user is restarted after being powered off), S-CSCF information registered by the user is registered in the HSS, the VoLTE user can initiate refresh registration to the S-CSCF periodically afterwards, at the moment, the I-CSCF sends UAR information to the HSS, and the HSS can also return the S-CSCF host name information registered by the user to the I-CSCF through UAA information.
Another scheme in the prior art is as follows: when HSS returns S-CSCF capability set to I-CSCF, when one capability set corresponds to one S-CSCF, I-CSCF queries DNS to obtain S-CSCF IP address according to S-CSCF host name, and forwards REGISTER message to S-CSCF, and completes the subsequent registration process. The implementation principle and advantages and disadvantages of the scheme are the same as those of the scheme, and the scheme is not adopted by the existing network at present because the core network of the VoLTE IMS of the existing network consists of a POOL formed by a plurality of S-CSCFs so as to improve the network security.
The third scheme in the prior art is as follows: the method comprises the steps that the I-CSCF is configured with a corresponding relation between an energy set and an S-CSCFPOOL name, when an HSS returns the capability set of the S-CSCF to the I-CSCF, the I-CSCF determines the S-CSCF POOL name corresponding to the capability set, and the I-CSCF obtains the host name of each S-CSCF in the S-CSCF POOL by inquiring a DNS according to the S-CSCFPOOL name. The I-CSCF uniformly distributes the VoLTE users to each S-CSCF by adopting a load sharing and polling distribution mechanism, and the processing mechanism is difficult to distribute the specified users or the user groups to the specified S-CSCF; or according to the IMSI number of the user, a certain fixed algorithm is adopted for calculation, and users with different number characteristics are fixedly allocated to different S-CSCF, in the scheme, one VoLTE user only fixedly registers to one S-CSCF and cannot register to other S-CSCF (except under the condition of S-CSCF failure), the VoLTE user cannot be flexibly controlled to change the registered S-CSCF, and the appointed user or user group is allocated to the appointed S-CSCF; on the other hand, the algorithm is limited by the IMSI number of the registered user, so that the load of each S-CSCF in the S-CSCF POOL is easily uneven, and the user migration cannot be carried out to balance the load of each S-CSCF.
Disclosure of Invention
In view of the above problems, the present invention proposes a method and an I-CSCF network element for controlling the registration of a VoLTE user to an S-CSCF that overcomes or at least partially solves the above problems.
To this end, in a first aspect, the present invention provides a method for controlling registration of a VoLTE user with an S-CSCF, including:
after receiving a REGISTER message, an I-CSCF network element of an inquiry call session control function (I-CSCF) of an internet protocol multimedia subsystem (IMS) network acquires a target International Mobile Subscriber Identity (IMSI) of VoLTE User Equipment (UE) carried by the REGISTER message;
the I-CSCF network element determines a target S-CSCF network element corresponding to the target IMSI based on a corresponding relation between a pre-configured IMSI and a host name of a service call session control function (S-CSCF) network element of the IMS network;
and the I-CSCF network element sends the REGISTER message to the target S-CSCF network element so as to realize the registration of the VoLTE user equipment UE on the target S-CSCF network element.
Optionally, after receiving the REGISTER message, the I-CSCF network element further includes:
the I-CSCF network element sends a user authorization request UAR message to a Home Subscriber Server (HSS), wherein the UAR message is used for inquiring the registration state of the UE;
the I-CSCF network element acquires a user authorization response UAA first message or a UAA second message fed back by the HSS;
the UAA first message is a UAA message which is fed back by the HSS after the UE is determined to be unregistered and carries an S-CSCF network element capability set of the IMS network; and the UAA second message is a UAA message which is fed back by the HSS after the UE is determined to be registered and carries the host name of the S-CSCF network element registered by the UE.
Optionally, if the I-CSCF network element obtains the UAA first message, the I-CSCF network element obtains the host name of each S-CSCF in the S-CSCF network element pool by querying a domain name system DNS server based on the name of the S-CSCF network element pool corresponding to the S-CSCF network element capability set.
Optionally, after determining the target S-CSCF network element corresponding to the target IMSI, the method further includes:
and the I-CSCF network element determines whether the target S-CSCF network element belongs to the S-CSCF network element pool, and if so, the REGISTER message is sent to the target S-CSCF network element.
Optionally, if the I-CSCF network element obtains the UAA second message, after determining the target S-CSCF network element corresponding to the target IMSI, the method further includes:
and the I-CSCF network element determines whether the target S-CSCF network element is the S-CSCF network element registered by the UE, and if so, the REGISTER message is sent to the target S-CSCF network element.
In a second aspect, the present invention further provides an I-CSCF network element, including:
the first acquisition unit is used for acquiring a target International Mobile Subscriber Identity (IMSI) of VoLTE User Equipment (UE) carried by a REGISTER message after the REGISTER message is received;
a first determining unit, configured to determine, based on a correspondence between a pre-configured IMSI and a host name of a serving call session control function S-CSCF network element of the IMS network, a target S-CSCF network element corresponding to the target IMSI;
a first sending unit, configured to send the REGISTER message to the target S-CSCF network element, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
Optionally, the method further includes:
a second sending unit, configured to send a user authorization request UAR message to a home subscriber server HSS after the first obtaining unit receives the REGISTER message, where the UAR message is used to query a registration state of the UE;
a second obtaining unit, configured to obtain a UAA first message or a UAA second message in response to the user authorization fed back by the HSS;
the UAA first message is a UAA message which is fed back by the HSS after the UE is determined to be unregistered and carries an S-CSCF network element capability set of the IMS network; and the UAA second message is a UAA message which is fed back by the HSS after the UE is determined to be registered and carries the host name of the S-CSCF network element registered by the UE.
Optionally, the method further includes:
and a third obtaining unit, configured to, after the second obtaining unit obtains the UAA first message, obtain, by querying a domain name system DNS server, a host name of each S-CSCF in the S-CSCF network element pool based on the name of the S-CSCF network element pool corresponding to the S-CSCF network element capability set.
Optionally, the method further includes:
a second determining unit, configured to determine, after the first determining unit determines the target S-CSCF network element corresponding to the target IMSI, whether the target S-CSCF network element belongs to the S-CSCF network element pool;
correspondingly, the first sending unit is configured to send the REGISTER message to the target S-CSCF network element after the second determining unit determines that the target S-CSCF network element belongs to the S-CSCF network element pool, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
Optionally, the method further includes:
a third determining unit, configured to determine, after the second obtaining unit obtains the UAA second message and the first determining unit determines a target S-CSCF network element corresponding to the target IMSI, whether the target S-CSCF network element is an S-CSCF network element that the UE has registered;
correspondingly, the first sending unit is configured to send the REGISTER message to the target S-CSCF network element after the third determining unit determines that the target S-CSCF network element is the S-CSCF network element registered by the UE, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
Compared with the prior art, the method for controlling the VoLTE user to register the S-CSCF and the I-CSCF network element control the target VoLTE user or user group to migrate according to the corresponding relation between the pre-configured IMSI information of the VoLTE user and the S-CSCF host name information, so that the target VoLTE user or user group is registered to the specified S-CSCF, and the flexibility of the VoLTE user to register to the S-CSCF is enhanced.
Furthermore, the invention can quickly realize the registration adjustment of single users or batch users by only executing an instruction on the I-CSCF according to the maintenance requirement without adjusting the single user data on the HSS. The workload of user data adjustment is greatly reduced, and a better means for load balancing adjustment among network elements in the S-CSCF POOL is provided.
Furthermore, the method for controlling the VoLTE user to register the S-CSCF and the I-CSCF network element provided by the invention improve the positioning efficiency of the VoLTE core network problem, simplify the difficulty of dialing and testing the appointed S-CSCF, and facilitate the load balance of the VoLTE core network equipment.
Drawings
Fig. 1 is a flowchart of a method for controlling registration of a VoLTE subscriber with an S-CSCF according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling registration of a VoLTE subscriber with an S-CSCF according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an I-CSCF network element according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention.
It should be noted that the words "first", "second", "third", etc. are used herein only to distinguish the same names from each other, and do not imply a relationship or order between the names.
As shown in fig. 1, the present embodiment discloses a method for controlling registration of a VoLTE user with an S-CSCF, which may include the following steps 101 to 103:
101. after receiving a REGISTER message, an inquiry-Call Session Control Function (I-CSCF) network element of an Internet Protocol Multimedia Subsystem (IMS) network acquires a target International Mobile Subscriber Identity (IMSI) of VoLTE User Equipment (UE) carried in the REGISTER message.
102. The I-CSCF network element determines a target S-CSCF network element corresponding to the target IMSI based on a pre-configured corresponding relationship between the IMSI and a host name of a Serving-Call Session Control Function (S-CSCF) network element of the IMS network.
In this embodiment, the I-CSCF network element is preconfigured with a corresponding relationship between the IMSI of the VoLTE UE and the host name of the S-CSCF network element, for example, a mapping relationship table between the IMSI and the host name of the S-CSCF network element, or a mapping relationship table between the IMSI number segment and the host name of the S-CSCF network element, and the mapping relationship table may be preconfigured according to actual needs (for example, maintenance needs).
103. And the I-CSCF network element sends the REGISTER message to the target S-CSCF network element so as to realize the registration of the VoLTE user equipment UE on the target S-CSCF network element.
It can be seen that, in the method for controlling a VoLTE user to register an S-CSCF disclosed in this embodiment, a target VoLTE user or a user group is controlled to migrate according to a pre-configured correspondence between IMSI information of the VoLTE user and host name information of the S-CSCF, so that the target VoLTE user or the user group is registered on an assigned S-CSCF, thereby enhancing flexibility of registering the VoLTE user to the S-CSCF, and overcoming a defect that a VoLTE core network in the prior art cannot perform assigned S-CSCF registration according to maintenance needs.
In a specific example, after receiving the REGISTER message, the I-CSCF network element in step 101 shown in fig. 1 further includes steps 101' and 101 ″ not shown in fig. 1:
101', the I-CSCF network element sends a User Authorization Request (UAR) message to a Home Subscriber Server (HSS), where the UAR message is used to query a registration status of the UE. The registration status of the UE includes unregistered and registered.
101 ", the I-CSCF network element obtains a first User Authorization Answer (UAA) message or a second UAA message fed back by the HSS;
the UAA first message is a UAA message which is fed back by the HSS after the UE is determined to be unregistered and carries an S-CSCF network element capability set of the IMS network; and the UAA second message is a UAA message which is fed back by the HSS after the UE is determined to be registered and carries the host name of the S-CSCF network element registered by the UE.
In this embodiment, if the HSS determines that the registration state of the UE is unregistered, it is determined that the registration procedure initiated by the UE is an initial registration procedure; if the HSS determines that the registration state of the UE is registered, the registration flow initiated by the UE is judged to be a refresh registration flow.
Based on the specific example one, in a specific example two, in step 101 ″, if the I-CSCF network element acquires the UAA first message, the I-CSCF network element acquires the host Name of each S-CSCF in the S-CSCF network element pool by querying a Domain Name System (DNS) server based on the Name of the S-CSCF network element pool corresponding to the S-CSCF network element capability set. The POOL of S-CSCF network elements is also denoted S-CSCF POOL in the following.
In this embodiment, the I-CSCF network element is preconfigured with a correspondence between an energy set and an S-CSCF POOL name. When the I-CSCF network element acquires the capability set of the S-CSCF network element carried in the UAA first message, the I-CSCF network element can determine the name of the S-CSCFPOOL corresponding to the capability set, the I-CSCF network element can query a DNS (domain name server) based on the name of the S-CSCF POOL, and the DNS returns a list of the host names of the S-CSCF network elements of the S-CSCF POOL, namely the I-CSCF network element can acquire the host names of the S-CSCFs in the S-CSCF POOL.
Based on the second specific example, in the third specific example, after determining the target S-CSCF network element corresponding to the target IMSI in step 102 shown in fig. 1, the method further includes step 102' not shown in fig. 1:
102', the I-CSCF network element determines whether the target S-CSCF network element belongs to the S-CSCF network element pool, if so, step 103 is performed.
In this embodiment, in step 102', if the target S-CSCF network element does not belong to the S-CSCF network element pool, then the I-CSCF may perform S-CSCF allocation registration by using the existing load sharing round robin allocation or using a fixed algorithm according to the IMSI.
Based on the specific example two and the specific example three, it can be seen that, when a VoLTE user initially REGISTERs, the I-CSCF performs matching analysis with the IMSI set in the mapping relationship table according to the IMSI information carried in the REGISTER message. And if the matching is successful and the corresponding S-CSCF host name is in the S-CSCF host name list returned by the query DNS, sending the REGISTER message to the specified S-CSCF. And if the IMSI can not be matched, or the IMSI can be successfully matched but the corresponding S-CSCF host name is not in the S-CSCF host name list returned by the query DNS, continuing to perform S-CSCF allocation registration according to the existing load sharing round-robin allocation or by adopting a fixed algorithm according to the IMSI.
Based on the first specific example, in a fourth specific example, in step 101 ″, if the I-CSCF network element acquires the UAA second message, after determining the target S-CSCF network element corresponding to the target IMSI in step 102, further includes step 102 ″ not shown in fig. 1:
102 ″ and the I-CSCF network element determines whether the target S-CSCF network element is an S-CSCF network element registered by the UE, if so, step 103 is executed.
In this embodiment, in step 102', if the target S-CSCF network element is not the S-CSCF network element registered by the UE, it indicates that a configuration error may occur when the mapping relationship table is preconfigured, and at this time, the I-CSCF network element sends the REGISTER message to the S-CSCF network element registered by the UE, so as to implement re-registration of the UE in the S-CSCF network element registered by the UE.
Based on the fourth specific example, when the VoLTE user refreshes registration, the I-CSCF performs matching analysis with the IMSI set in the mapping table according to the IMSI information carried in the REGISTER message. And if the matching can be successful, sending the REGISTER message to the designated S-CSCF. And if the IMSI can not be matched, the REGISTER message of the VoLTE user is still sent to the originally registered S-CSCF.
Based on the above disclosed method embodiment for controlling the registration of the VoLTE subscriber to the S-CSCF, the following example is given:
taking the example of controlling the initial registration of VoLTE user a to S-CSCF1 in S-CSCF POOL (where there are 3S-CSCFs in S-CSCF POOL, denoted as S-CSCF1, S-CSCF2, and S-CSCF3), a specific procedure for assigning S-CSCF to perform registration will be described with reference to fig. 2.
The concrete description is as follows:
step 1, a mapping relation table of IMSI and S-CSCF1 host name of VoLTE user equipment UE A is pre-configured on an I-CSCF network element.
Step 2, A initiates REGISTER message to I-CSCF network element, wherein the REGISTER message carries IMSI information of A;
and 3, the I-CSCF network element sends UAR information to the HSS to request to acquire the capability set of the S-CSCF of the A home domain.
And 4, the HSS returns a UAA message which contains the capability set of the user A signing the S-CSCF POOL.
And step 5, the I-CSCF network element obtains the S-CSCF POOL host name according to the capability set.
And 6, the I-CSCF network element queries a DNS server according to the S-CSCF POOL host name.
And 7, the DNS server returns the host names of the 3S-CSCF in the S-CSCF POOL.
And 8, the I-CSCF network element inquires the mapping relation table configured in the step 1, and the matching A is appointed to be registered to the S-CSCF 1.
Step 9, the I-CSCF network element sends the REGISTER message of a to the S-CSCF 1.
Continuing with the subsequent registration procedure, a completes the registration at the S-CSCF 1. The subsequent registration process may refer to related protocols, which is not described in detail in this embodiment.
It can be seen that, in the method for controlling the registration of the VoLTE subscriber to the S-CSCF disclosed in the embodiment, the VoLTE subscriber matched with the IMSI information can be controlled to be flexibly registered to the designated S-CSCF only by configuring the corresponding relationship between the IMSI information of the VoLTE subscriber and the host name information of the S-CSCF in advance in the I-CSCF and performing matching analysis on the IMSI of the registered subscriber. The existing load sharing scheme needs the user to repeatedly perform the on-off registration operation, because the I-CSCF performs alternate selection and distribution on all VoLTE users, the randomness is strong, and the more the number of S-CSCFs in the S-CSCF POOL is, the lower the probability of registering to the appointed S-CSCF is. In the existing fixed algorithm scheme, the VoLTE user is fixedly allocated to a fixed S-CSCF according to the IMSI number of the VoLTE user, and the possibility of registering to a designated S-CSCF is less. According to the method for controlling the VoLTE user to register the S-CSCF, the target VoLTE user or the user group is controlled to be migrated according to the corresponding relation between the pre-configured IMSI information of the VoLTE user and the S-CSCF host name information, so that the target VoLTE user or the user group is registered on the designated S-CSCF, the flexibility of the VoLTE user to be registered on the S-CSCF is enhanced, and the defect that the VoLTE core network in the prior art cannot perform designated S-CSCF registration according to maintenance requirements is overcome.
Further, the method for controlling the registration of the VoLTE user to the S-CSCF disclosed in the embodiment does not need to adjust the data of a single user on the HSS, and can quickly realize the registration adjustment of the single user or the batch of users only by executing an instruction on the I-CSCF according to the maintenance requirement to pre-configure the mapping relationship table. The workload of user data adjustment is greatly reduced, and a better means for load balancing adjustment among network elements in the S-CSCFPOOL is provided.
Furthermore, the method for controlling the registration of the VoLTE user to the S-CSCF, disclosed by the embodiment, improves the positioning efficiency of the VoLTE core network problem, and facilitates the positioning test and problem reproduction of the appointed network element of the VoLTE network; the difficulty of dialing test of the designated S-CSCF is simplified, the load balance of VoLTE core network equipment is facilitated, and the user migration balance is facilitated aiming at the condition of uneven load in the S-CSCF POOL.
As shown in fig. 3, this embodiment discloses an I-CSCF network element, which may include the following units: the first acquiring unit 31, the first determining unit 32, and the first sending unit 33, each of which is specifically described as follows:
a first obtaining unit 31, configured to obtain, after receiving a REGISTER message, a target international mobile subscriber identity IMSI of a VoLTE user equipment UE carried in the REGISTER message;
a first determining unit 32, configured to determine, based on a correspondence between a preconfigured IMSI and a host name of a serving call session control function S-CSCF network element of the IMS network, a target S-CSCF network element corresponding to the target IMSI;
a first sending unit 33, configured to send the REGISTER message to the target S-CSCF network element, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
The I-CSCF network element disclosed in this embodiment may implement the method flow for controlling registration of the VoLTE user with the S-CSCF shown in fig. 1, and therefore, for the effect and description of the I-CSCF network element in this embodiment, reference may be made to the method embodiment shown in fig. 1, and details are not repeated here.
In a specific example, the I-CSCF network element shown in fig. 3 further includes a second sending unit 34 and a second obtaining unit 35, which are not shown in fig. 3:
a second sending unit 34, configured to send a user authorization request UAR message to a home subscriber server HSS after the first obtaining unit 31 receives the REGISTER message, where the UAR message is used to query a registration status of the UE;
a second obtaining unit 35, configured to obtain a UAA first message or a UAA second message of the user authorization response fed back by the HSS;
the UAA first message is a UAA message which is fed back by the HSS after the UE is determined to be unregistered and carries an S-CSCF network element capability set of the IMS network; and the UAA second message is a UAA message which is fed back by the HSS after the UE is determined to be registered and carries the host name of the S-CSCF network element registered by the UE.
In a specific example, the I-CSCF network element shown in fig. 3 further includes a third obtaining unit 36 not shown in fig. 3:
a third obtaining unit 36, configured to, after the second obtaining unit 35 obtains the UAA first message, obtain, based on the name of the S-CSCF network element pool corresponding to the S-CSCF network element capability set, a host name of each S-CSCF in the S-CSCF network element pool by querying a domain name system DNS server.
In a specific example, the I-CSCF network element shown in fig. 3 further comprises a second determining unit 37 not shown in fig. 3:
a second determining unit 37, configured to determine, after the first determining unit 32 determines the target S-CSCF network element corresponding to the target IMSI, whether the target S-CSCF network element belongs to the S-CSCF network element pool;
correspondingly, the first sending unit 33 is configured to send the REGISTER message to the target S-CSCF network element after the second determining unit 37 determines that the target S-CSCF network element belongs to the S-CSCF network element pool, so as to implement registration of the VoLTE user equipment UE on the target S-CSCF network element.
In a specific example, the I-CSCF network element shown in fig. 3 further comprises a third determining unit 38, not shown in fig. 3:
a third determining unit 38, configured to determine, after the second obtaining unit 37 obtains the UAA second message and the first determining unit determines the target S-CSCF network element corresponding to the target IMSI, whether the target S-CSCF network element is an S-CSCF network element that the UE has registered;
correspondingly, the first sending unit 33 is configured to send the REGISTER message to the target S-CSCF network element after the third determining unit 38 determines that the target S-CSCF network element is the S-CSCF network element that the UE has registered, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
It can be seen that, in the I-CSCF network element disclosed in the embodiment, the VoLTE subscriber matched with the IMSI information can be controlled to be flexibly registered in the designated S-CSCF only by configuring the corresponding relationship between the IMSI information of the VoLTE subscriber and the host name information of the S-CSCF in advance in the I-CSCF and performing matching analysis on the IMSI of the registered subscriber. The existing load sharing scheme needs the user to repeatedly perform the on-off registration operation, because the I-CSCF performs alternate selection and distribution on all VoLTE users, the randomness is strong, and the more the number of S-CSCFs in the S-CSCF POOL is, the lower the probability of registering to the appointed S-CSCF is. In the existing fixed algorithm scheme, the VoLTE user is fixedly allocated to a fixed S-CSCF according to the IMSI number of the VoLTE user, and the possibility of registering to a designated S-CSCF is less. According to the method for controlling the VoLTE user to register the S-CSCF, the target VoLTE user or the user group is controlled to be migrated according to the corresponding relation between the pre-configured IMSI information of the VoLTE user and the S-CSCF host name information, so that the target VoLTE user or the user group is registered on the designated S-CSCF, the flexibility of the VoLTE user to be registered on the S-CSCF is enhanced, and the defect that the VoLTE core network in the prior art cannot perform designated S-CSCF registration according to maintenance requirements is overcome.
Further, the I-CSCF network element disclosed in the embodiments does not need to adjust single user data on the HSS, and can quickly implement registration adjustment of single users or batch users by only executing an instruction on the I-CSCF according to maintenance needs to pre-configure the mapping relationship table. The workload of user data adjustment is greatly reduced, and a better means for load balancing adjustment among network elements in the S-CSCF POOL is provided.
Furthermore, the I-CSCF network element disclosed by the embodiment improves the positioning efficiency of the VoLTE core network problem, and facilitates the positioning test and problem reproduction of the specified network element of the VoLTE network; the difficulty of dialing test of the designated S-CSCF is simplified, the load balance of VoLTE core network equipment is facilitated, and the user migration balance is facilitated aiming at the condition of uneven load in the S-CSCF POOL.
It will be appreciated by a person skilled in the art that the units of the embodiments may be combined into one unit and furthermore that they may be divided into a plurality of sub-units. All of the features disclosed in this specification, and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification may be replaced by an alternative feature serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.
It will be appreciated by a person skilled in the art that the units of the embodiments may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (10)

1. A method for controlling a VoLTE subscriber registration S-CSCF service call session control function, comprising:
after receiving a REGISTER message, an I-CSCF network element of an inquiry call session control function (I-CSCF) of an internet protocol multimedia subsystem (IMS) network acquires a target International Mobile Subscriber Identity (IMSI) of VoLTE User Equipment (UE) carried by the REGISTER message;
the I-CSCF network element determines a target S-CSCF network element corresponding to the target IMSI based on a corresponding relation between a pre-configured IMSI and a host name of a service call session control function (S-CSCF) network element of the IMS network; and the I-CSCF network element determines whether the target S-CSCF network element belongs to the S-CSCF network element pool, and if so, the I-CSCF network element sends the REGISTER message to the target S-CSCF network element so as to realize the registration of the VoLTE user equipment UE in the target S-CSCF network element.
2. The method of claim 1, wherein the I-CSCF network element, upon receiving the REGISTER message, further comprises:
the I-CSCF network element sends a user authorization request UAR message to a Home Subscriber Server (HSS), wherein the UAR message is used for inquiring the registration state of the UE;
the I-CSCF network element acquires a user authorization response UAA first message or a UAA second message fed back by the HSS;
the UAA first message is a UAA message which is fed back by the HSS after the UE is determined to be unregistered and carries an S-CSCF network element capability set of the IMS network; and the UAA second message is a UAA message which is fed back by the HSS after the UE is determined to be registered and carries the host name of the S-CSCF network element registered by the UE.
3. The method according to claim 2, wherein if the I-CSCF network element obtains the UAA first message, the I-CSCF network element obtains the host name of each S-CSCF in the S-CSCF network element pool by querying a domain name system, DNS, server based on the name of the S-CSCF network element pool corresponding to the S-CSCF network element capability set.
4. The method of claim 3, wherein after determining the target S-CSCF network element corresponding to the target IMSI, the method further comprises:
and the I-CSCF network element determines whether the target S-CSCF network element belongs to the S-CSCF network element pool, and if so, the REGISTER message is sent to the target S-CSCF network element.
5. The method according to claim 2, wherein if the I-CSCF network element obtains the UAA second message, after determining the target S-CSCF network element corresponding to the target IMSI, further comprising:
and the I-CSCF network element determines whether the target S-CSCF network element is the S-CSCF network element registered by the UE, and if so, the REGISTER message is sent to the target S-CSCF network element.
6. An I-CSCF query call session control function network element, comprising:
the first acquisition unit is used for acquiring a target International Mobile Subscriber Identity (IMSI) of VoLTE User Equipment (UE) carried by a REGISTER message after the REGISTER message is received;
a first determining unit, configured to determine, based on a correspondence between a pre-configured IMSI and a host name of a serving call session control function S-CSCF network element of an IMS network, a target S-CSCF network element corresponding to the target IMSI;
a first sending unit, configured to send the REGISTER message to the target S-CSCF network element, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
7. The I-CSCF network element of claim 6 further comprising:
a second sending unit, configured to send a user authorization request UAR message to a home subscriber server HSS after the first obtaining unit receives the REGISTER message, where the UAR message is used to query a registration state of the UE;
a second obtaining unit, configured to obtain a UAA first message or a UAA second message in response to the user authorization fed back by the HSS;
the UAA first message is a UAA message which is fed back by the HSS after the UE is determined to be unregistered and carries an S-CSCF network element capability set of the IMS network; and the UAA second message is a UAA message which is fed back by the HSS after the UE is determined to be registered and carries the host name of the S-CSCF network element registered by the UE.
8. The I-CSCF network element of claim 7 further comprising:
and a third obtaining unit, configured to, after the second obtaining unit obtains the UAA first message, obtain, by querying a domain name system DNS server, a host name of each S-CSCF in the S-CSCF network element pool based on the name of the S-CSCF network element pool corresponding to the S-CSCF network element capability set.
9. The I-CSCF network element of claim 8 further comprising:
a second determining unit, configured to determine, after the first determining unit determines the target S-CSCF network element corresponding to the target IMSI, whether the target S-CSCF network element belongs to the S-CSCF network element pool;
correspondingly, the first sending unit is configured to send the REGISTER message to the target S-CSCF network element after the second determining unit determines that the target S-CSCF network element belongs to the S-CSCF network element pool, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
10. The I-CSCF network element of claim 7 further comprising:
a third determining unit, configured to determine, after the second obtaining unit obtains the UAA second message and the first determining unit determines a target S-CSCF network element corresponding to the target IMSI, whether the target S-CSCF network element is an S-CSCF network element that the UE has registered;
correspondingly, the first sending unit is configured to send the REGISTER message to the target S-CSCF network element after the third determining unit determines that the target S-CSCF network element is the S-CSCF network element registered by the UE, so as to implement registration of the VoLTE user equipment UE in the target S-CSCF network element.
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