Systems and methods for application-friendly protocol data unit (PDU) session management
Methods by which User Plane (UP) management information is exchanged between an Application Function (AF) supporting one or more applications and a Slice Management Function (SMF) configured to manage traffic flows in a given slice of the network. The exchange of UP management information may be initiated from either the AF or the SMF. In the case of AF-initiated information exchange, the UP management information provided by the AF may comprise traffic requirements of applications supported by the AF. In the case of SMF-initiated information exchange, the UP management information provided by the SM may comprise operator policy information or events, and the AF may respond with information of traffic requirements of applications supported by the AF.
1. A method of data management, comprising:
sending, by an application function (AF), an AF request to a network exposure function (NEF);
storing, by the NEF, information associated with the AF request into a data repository function, the data repository function being a function storing user data and policy data;
subscribing, by a policy control function (PCF), to a notification of a data change from the data repository function;
notifying the PCF, by the data repository function, of the data change, wherein the data change is associated with the AF request;
generating a policy, by the PCF, according to information associated with the data change; and
sending, by the PCF, the policy to a session management function (SMF).
2. The method according to claim 1 , wherein the information associated with the AF request comprises application data, the application data comprising information, about an application, configured for policy generation.
3. The method according to claim 1 , further comprising:
receiving, by the data repository function, a subscription from the PCF wherein the subscription is to the notification of the data change.
4. The method according to claim 1 , wherein the method further comprises: processing, by the NEF, the AF request to obtain information which is mapped to information included in the AF request; and wherein storing the information associated with the AF request into the data repository function comprises: storing, by the NEF, the information which is mapped to information included in the AF request into the data repository function.
5. The method according to claim 1 , wherein storing by the NEF the information associated with the AF request into the data repository function comprises: receiving, by the data repository function, the AF request from the NEF; and storing, by the data repository function, information included in the AF request.
6. The method according to claim 1 , wherein before notifying the PCF of the data change, the method further comprises:
identifying the PCF which subscribes to the notification of the data change.
7. The method according to claim 1 , further comprising:
notifying, by the data repository function, a third PCF which subscribes to a notification of a policy data change event, of information associated with the policy data.
8. The method according to claim 1 , wherein the AF request is to influence a session management function (SMF) routing decision for traffic of a protocol data unit (PDU) session and includes potential locations of an application, and the data change indicates the information associated with the AF request is different from stored information in the data repository function; wherein
the policies indicate a part of a set of traffic steering behaviors wherein the set of traffic steering behaviors is preconfigured in the SMF, and each of indicated traffic steering behaviors corresponds to one of potential locations of the application; and
wherein the method further comprises: selecting, by the SMF, one of the received traffic steering behaviors.
9. The method according to claim 1 , wherein the AF request is to request for subscription to a UP management event notification, and the data change indicates at least one of the information associated with the AF request is different from stored information in the data repository function;
wherein the policy is associated with the user plane (UP) path management event notification for a PDU session; and
wherein the method further comprises: notifying, by the SMF via the NEF, the AF about a result of UP path selection according to the policy.
10. A communication system comprising at least one processor and non-transitory memory storing instructions for execution by the at least one processor to implement a data repository function, an application function (AF), a network exposure function (NEF), and a policy control function (PCF), the data repository function, the AF, the NEF and the PCF being communicatively coupled through interfaces wherein:
the AF is configured to send an AF request to the NEF;
the NEF is configured to receive the AF request and store information associated with the AF request into the data repository function;
the data repository function is configured to store user data and policy data, and further configured to send notifications to a subscribing PCF as to a data change; and
the PCF is configured to subscribe to a notification of a data change from the data repository function;
such that the PCF receives the notification of the data change from the data repository function, wherein the PCF is further configured to generate a policy according to information associated
with the data change and send the policy to a session management function (SMF).
11. The communication system according to claim 10 , wherein the information associated with the AF request comprises application data, the application data comprising information, about an application, configured for policy generation.
12. The communication system according to claim 10 , wherein the data repository function is further configured to receive a subscription from the PCF wherein the subscription is to the notification of the data change.
13. The communication system according to claim 10 , wherein the NEF is further configured to process the AF request received from the AF to obtain information which is mapped to information included in the AF request, and store the information which is mapped to information included in AF request into the data repository function.
14. The communication system according to claim 10 , wherein the data repository function is configured to receive the AF request from the NEF and store information included in the AF request.
15. The communication system according to claim 10 , wherein the data repository function is further configured to identify the PCF which subscribes to the notification of the information associated with the AF request.
16. The communication system according to claim 10 , wherein the communication system further comprises a third PCF configured to subscribes to a notification of a policy data change event, and the data repository function is configured to notify the third PCF of information associated with the policy data.
17. The communication system according to claim 10 , wherein the AF request is to influence a session management function (SMF) routing decision for traffic of a protocol data unit (PDU) session and includes potential locations of an application, and the data change indicates at least one of the information associated with the AF request is different from stored information in the data repository function; wherein the policy indicates a part of a set of traffic steering behaviors, wherein the set of traffic steering behaviors is preconfigured in the SMF, and each of indicated traffic steering behaviors corresponds to one of potential locations of the application; and
wherein the SMF is further configured to select one of the received traffic steering behaviors.
18. The communication system according to claim 10 , wherein the AF request is to request for subscription to a UP management event notification, and the data change indicates at least one of the information associated with the AF request is different from stored information in the data repository function; wherein the policy is associated with the user plane (UP) path management event notification and for a PDU session; wherein the SMF is further configured to notify, via the NEF, the AF about a result of UP path selection according to the policy.