• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Procedure and system to manage the transfer of assigned users between elements of ims networks. The present invention proposes a method and system that adds adaptability and recovery to an ims network, allowing users to transfer from a first functional element such as a cscf (even when it is virtual) to another. This transfer is managed by new functional elements of the network that are responsible, among other actions, for determining which users are assigned to the first cscf, which users are to be transferred, to which other cscf they are going to be transferred and inform the teams of the affected users. Thus, the present invention allows network operators to balance the load of users of different elements (if for example, one is saturated or to take better advantage of resources) or free resources of a cscf element to be able to deactivate it (for example because is underutilized) or because it is failing. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2572535A1
    申请号:ES201431780
    申请日:2014-12-01
    公开日:2016-06-01
    发明作者:Iván VIDAL FERNÁNDEZ；Jaime José GARCÍA REINOSO
    申请人:Universidad Carlos III de Madrid；
    IPC主号:
    专利说明:

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    When a user equipment receives the message informing them of the new assigned CSCF, it makes a new IMS level registration, using said assigned CSCF (P-CSCF or S-CSCF).
    In one embodiment, upon receiving the user equipment the message informing him of the change of
    5 CSCF and make said user equipment the new IMS level registration, sends the S-CSCF assigned to the user, a message to a Control Function Discovery application server, CFD-AS informing him of the CSCF to which the user has been changed and said Control Function Discovery application server updates the location service with said information.
    10
    In one embodiment, in step a3) the message is received by the message a functional element of the Local Control Function, LCF, of the user equipment and step a4) is performed by said element of the Local Control Function, LCF, which performs said transparently for the rest of the applications that are running on the computer
    15 user This LCF functional element can be integrated in the IMS function stack of the user equipment.
    In addition, after receiving the user equipment the message informing him of the change of CSCF and making said user equipment the new registration at the IMS level, the user equipment can
    20 replace all SIP dialogues established by said user via the first CSCF with new SIP dialogues established via the CSCF to which it has been changed.
    If the first CSCF is an S-CSCF, after step a2) and prior to step a3), the first functional element, CFS, can communicate with an HSS of the network of the first operator and
    25 sends the information of the new S-CSCF assigned to each user of said user group and the HSS updates the information of the S-CSCF assigned to each user, according to the information from the first functional element.
    The determination of the group of users to be transferred can be made based on at least information included in the transfer request and / or in the
    8
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    In a second aspect, the present invention proposes a system for transferring users in an IMS (sub) network of a communications network of a first communications operator, comprising:
    5 -A first functional element (CFS) of the communications network comprising:
    Means for receiving a transfer request from users assigned to a first CSCF where said first CSCF is a P-CSCF or an S-CSCF and
    Means for, when receiving said request, to obtain from a location network communication service, the identification of the users assigned to said communication
    10 first CSCF, determine from the users assigned to said first CSCF, which group of users will be transferred and to which CSCF each user of said group will be transferred and send a message informing the user team of each user of said group change of CSCF and assigned CSCF;
    15 -A second functional element (LCF) in each user equipment, with means to, upon receiving the message informing the CSCF to which it will be assigned, make said user equipment a new IMS level registration using said CSCF.
    In one embodiment, the system further comprises at least one application server 20 (CFD-AS) with means for:
    -Receive of an S-CSCF of the IMS network a message informing the CSCF that serves each user and update the location service with that information.
    In one embodiment the first functional element of the system additionally comprises:
    25 Means for receiving an indication that a new I-CSCF or a new Control Function Discovery application server or an indication that an I-CSCF or communications network has been removed from the communications network has been introduced into the communications network an existing Control Function Discovery application server and means for receiving said indication, change the configuration of a server name
    30 domains of the communications network of the first communications operator so that
    10
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    for end users and, in particular, to the applications that are running on end users' computers.
    The architecture presented here operates on the IMS infrastructure (IP Multimedia
    5 Subsystem), specified by the 3GPP for operator networks, and defines new functional elements (entities) and interfaces of these functional elements with the IMS elements, as well as with elements of the Operations Support System (OSS) System) and the Business Support System (BSS), through which they can interact with
    10 other architectures such as NFV; defining the signaling procedures between the new functional elements and the existing ones, in order to transfer the user assignments between IMS functional entities, such as proxy or service CSCFs.
    Now, functional entities (also called elements) will be described
    15), as well as the IMS signaling procedures proposed to support the appropriate assignment of users to the available CSCFs. These entities and signaling procedures allow, among other things, that a home operator, also called a domestic or household, in English "home operator" dynamically change the P-CSCF or the S-CSCF (and other functional entities) assigned to
    20 any of its users, in a transparent way for the applications of these users that run in the terminals (equipment) of users. Thus, the proposed architecture allows the origin operator to maintain an appropriate load distribution among the CSCFs (whether virtual or non-virtual).
    25 Figure 1 shows the proposed new functional elements and their relationship with the IMS core and with the OSS / BSS system. In Figure 1, the CSCF elements presented are virtual and an NFV architecture is used for virtualization, but this is only a particular example. The present invention can also be applied when CSCF elements are non-virtual or work with another virtualization architecture.
    30 other than NFV.
    These proposed new functional elements are:
    13
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    this request comes from an element of an NFV architecture or any other virtual or non-virtual element, since it communicates with the OSS / BSS).
    The CFS bases its operation mainly on the information stored by the CFD AS in the domain location service of the home network. That is, in the information of the CSCFs assigned to each user. The CFS receives an indication (from the OSS / BSS, through the reference point or interface that has been called Os-CFS) that a load transfer from a CSCF (a P-CSCF or an S-CSCF has to be performed) , virtual or non-virtual) that we will call CSCF origin, another that we will call CSCF destination. ...) As in these CSCF the load is produced by messages from the users assigned to it, this load transfer request is equivalent to a transfer request from assigned users. That is, this request indicates that users who are assigned to a CSCF have to be transferred to another CSCF for any reason, for example, overload, failure ...). As a consequence, the CFS obtains from the location service the information of the users that were served by the source CSCF. Using this information and according to the policies established by the origin operator, the CFS decides which group of users will be transferred from the origin CSCF to the destination CSCF, that is, they will be served (assigned) by the origin CSCF to be served. by the destination CSCF. Then, the CFS initiates the IMS signaling procedures that allow the change of CSCF assigned to this user group; To do this, contact via the reference point or interface that has been called CFS-UE with a Local Control Function (LCF) functional element that is in each of the users IMS user equipment of the group to transfer. That is, the CFS contacts the LCF of the user equipment of each user to be transferred from one CSCF to another. The LCF (which is a new functional element proposed by the present invention) is integrated into the IMS function stack of the user equipment (from the user terminal) and the LCF executes these signaling processes for transparent user transfer for any end user application that runs on the user computer. In other words, end-user applications are not affected by their operation nor do they have to take any additional action for the change of CSCF.
    The OSS / BSS also contacts the CFS when it is introduced (discharged) into the network or deletes a new virtual I-CSCF or CFD AS (that is, a virtual function that executes the
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    As specified, the indication can also come from a CFS of another operator (from a visited network); This occurs, for example, when a P-CSCF, virtual or non-virtual, of a visited network has failed or should be removed, and the CFS in the home-based network has indicated its desire to receive notifications about the status of that P- CSCF This usually occurs when said P-CSCF is assigned to one or more users of the home network that are roaming in the visited network. In this case, a CFS of the visited network will indicate to the CFS of the home network that a P-CSCF transfer must be made and optionally indicate the reason for the transfer and even an alternative P-CSCF or P-CSCFs to which the affected users of the home network can be assigned. In this case, the CFS of the home network will determine the group of users that are assigned to the affected P-CSCF, using the location service. These users will be transferred to the P-CSCF or alternative P-CSCFs of the visited network indicated in the transfer order (if any has been indicated therein).
    After receiving the indication and determining the set of users to be transferred, the CFS communicates with (2) the user equipment (UE) of each IMS user that is going to be transferred to another P-CSCF (which we will call new P- CSCF or P-CSCF destination). This communication is established between the CFS and the LCF functional element which, as explained above, is in each IMS user equipment. This communication is done through the interface (or reference point cfs-ue); it must be possible to communicate between the CFS and the LCF without using the usual IMS signaling route, since the transfer of users may be due precisely to a fault or an oversaturated P-CSCF, so the IMS signaling route usual (which goes through the P-CSCF assigned to the user) would not work correctly.
    As a result of the communication with the CFS (where the CFS informs you of the address of the new P-CSCF assigned to the user), the LCF can independently initiate the IMS signaling procedures necessary to force the assignment of the user to the destination P-CSCF. Specifically, the LCF executes a new record at the IMS level (3), through the destination P-CSCF, using the address of the destination P-CSCF indicated by the CFS. After a successful user registration, and following the usual IMS procedures, the S-CSCF assigned to the user performs service control functions, sending a SIP registration request message (in English SIP Register) for all application servers specified in the user profile for the registration event. So,
    19


    A registration request is sent to the CFD application server, informing you of the new P-CSCF assigned to the user (P-CSCF destination) and the CFD updates the location service information to reflect the identification (for example, the address) of the P -CSCF now assigned to the user.
    Finally, to complete the transfer of the user to the new P-CSCF, it is necessary to replace all the SIP dialogues established by the user through the old P-CSCF, with new SIP dialogs through the new P-CSCF. This process of change is done by known procedures (for example, those defined in the document by R. Mahy, B. Biggs, R. Dean, The Session Initiation Protocol (SIP) "Replaces" Header, RFC 3891, September 2004, of the Internet Engineering Task Force (or IETF), in Figure 2, (step 4), the most important messages to replace a specific SIP dialogue via the old P- are shown. CSCF by one via the new P-CSCF, according to an accomplishment of said process.To do this, the user team sends a SIP dialogue invitation (in English, "Invite") to the recipient part of the dialogue, receives the OK of the recipient party (also called remote party) and sends confirmation (all these messages are sent by the UE, via the new P-CSCF and the S-CSCF that allows communication with the recipient party.) Once this is done, you send a termination message (or cie rre) of the SIP dialogue (in English, “Bye”) to close the SIP dialogue established via the old P-CSCF. This termination message and its respective confirmation is made via the old P-CSCF.
    Change of assignment of an S-CSCF
    Next, the procedure that is performed, according to an embodiment of the invention, for changing the S-CSCF entity assigned to a particular user will be described. A diagram with the main messages exchanged in this procedure is shown in Figure 3. As in the previous scenario, it has been assumed that prior to this change procedure, said user has registered in the IMS network and has established a set of multimedia sessions using the SIP protocol, using the usual procedure defined in the IMS specifications.
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    The procedure is similar to the one described above for the change of P-CSCF, but with one main difference: Since the S-CSCF is a functional entity that is always located in the user's home network (in English), the indication for redistribution of load (of assigned users) (1) can only be given to the CFS entity from the home network itself (for example, as indicated above, from the OSS / BSS system of the home network ) and not from a visited network (in English “visited network”) as could be the case in the previous case. Load transfer may be required, for example, due to the overload or failure of an S-CSCF which implies that at least part of the users assigned to it must be transferred to at least one other S-CSCF in the source network. This second S-CSCF (one or more) to which users (who produce the load) are transferred can be an S-CSCF that is already being used or a newly created S-CSCF (which can be non-virtual or virtual, for example, a virtual S-CSCF provided by the NFV management and orchestration system to replace a failed S-CSCF). The transfer may also be due to the fact that the load of the S-CSCF is so low that it is decided to dispense with it and distribute its load. The entity that gives the indication to the CFS (for example, the OSS / BSS system of the originating network) may include in the indication, the cause of the transfer, the S-CSCFs to which load must be transferred and the quantity charged which you must transfer to other S-CSCF (you can even specify what number or percentage of users you must transfer to each S-CSCF).
    After the first step (1) in which the CFS entity receives an indication to make a load transfer (of assigned users) from a first S-CSCF to another (or others), the CFS obtains from the location service, the information about which users are assigned to the affected S-CSCF, whose users must be transferred (which we will clearly call old S-CSCF or S-CSCF origin). Based on said information and taking into account at least the information included in the transfer indication and the policies established by the operator of origin (the rules previously established by the operator for these types of cases), the CFS determines the set of users that They will be transferred to each existing S-CSF.
    Then, for each user that is going to be transferred to another S-CSCF, the CFS contacts the HSS (2) of the originating network (through the interface or reference point Cx) and changes in the HSS the assigned S-CSCF to that user. This can be done, using for example, the commands defined by the IMS standard as an authentication request
    twenty-one
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    权利要求:
    Claims (1)
    [1]
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    ES201431780A|ES2572535B1|2014-12-01|2014-12-01|Procedure and system to manage the transfer of assigned users, between elements of IMS networks|ES201431780A| ES2572535B1|2014-12-01|2014-12-01|Procedure and system to manage the transfer of assigned users, between elements of IMS networks|
    PCT/ES2015/070850| WO2016087695A1|2014-12-01|2015-11-24|Method and system for managing the transfer of assigned users between ims network elements|
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