Techniques for improved service call session restoration
Techniques are described herein for providing improved service call session restoration. In embodiments, such techniques may comprise storing, at a home subscriber server (HSS), information about a proxy call session control function (P-CSCF) node. The HSS may then receive an indication that a first service call session control function (S-CSCF) node is unresponsive. Upon receiving such an indication, the techniques may comprise determining, based on a user profile, that the first S-CSCF node is associated with the P-CSCF node; selecting, based on the information about the P-CSCF node, a second S-CSCF node to be associated with the P-CSCF node; and providing, by the HSS, at least a portion of the information about the P-CSCF node to the second S-CSCF node. The second S-CSCF node can then be configured to replace the first P-CSCF node using that information.
1 . A method comprising:
storing, at a home subscriber server (HSS), information about a proxy call session control function (P-CSCF) node in association with information about a specific user equipment (UE) that has a connection supported by the P-CSCF node;
receiving, at the HSS, an indication that a first service call session control function (S-CSCF) node is unresponsive, wherein the first S-CSCF node was also associated with the connection of the specific UE;
selecting, by the HSS and based on the information about one or more capabilities, a second S-CSCF node to replace the first S-CSCF node for the connection of the specific UE, wherein the second S-CSCF node is selected from a set of available S-CSCF nodes and the set of available S-CSCF nodes are identified via a domain name system (DNS) query;
receiving, by the HSS from the second S-CSCF node, a request for the information about the P-CSCF node; and
providing, by the HSS, at least a portion of the information about the P-CSCF node to the second S-CSCF node.
2 . The method of claim 1 , wherein the indication that the first S-CSCF node is unresponsive is received in relation to a communication directed toward the specific UE.
3 . The method of claim 2 , wherein the first S-CSCF node is associated with the P-CSCF node during a registration of the specific UE.
4 . The method of claim 1 , wherein the second S-CSCF node is selected using one or more vector similarity analysis techniques.
5 . The method of claim 4 , wherein the method further comprises generating a vector in which each of a number of capabilities supported by the second S-CSCF node are represented as a value along an axis in a multi-dimensional space.
6 . The method of claim 1 , wherein the indication that the first S-CSCF node is unresponsive comprises one of a lack of response from the first S-CSCF node or an error code received from the first S-CSCF node.
7 . The method of claim 1 , wherein the information about the P-CSCF node comprises an indication of one or more capabilities associated with the P-CSCF node.
8 . A Home Subscriber Server (HSS) computing device comprising:
one or more processors; and
one or more non-transitory computer-readable media storing computer-executable instructions that, when executed by the one or more processors, cause computing device to perform operations comprising:
storing information about a proxy call session control function (P-CSCF) node in association with information about a specific user equipment (UE) that has a connection supported by the P-CSCF node;
receiving an indication that a first service call session control function (S-CSCF) node is unresponsive, wherein the first S-CSCF node was also associated with the connection of the specific UE;
selecting, based on the information about one or more capabilities, a second S-CSCF node to replace the first S-CSCF node for the connection of the specific UE, wherein the second S-CSCF node is selected from a set of S-CSCF nodes determined to be available and the set of S-CSCF nodes determined to be available is identified based on a current workload or bandwidth usage;
receiving, from the second S-CSCF node, a request for the information about the P-CSCF node; and
providing at least a portion of the information about the P-CSCF node to the second S-CSCF node.
9 . The computing device of claim 8 , wherein the information about the specific UE is created upon registration of the specific UE.
10 . The computing device of claim 8 , wherein the information about the P-CSCF node comprises an indication of one or more capabilities associated with the P-CSCF node.
11 . The computing device of claim 8 , wherein the second S-CSCF node is selected based on a degree of similarity between the one or more capabilities and a second set of capabilities of the second S-CSCF node.
12 . A system comprising:
at least one proxy call session control function (P-CSCF) node;
multiple service call session control function (S-CSCF) nodes; and
a home subscriber server (HSS) configured to:
store information about the P-CSCF node in association with information about a specific user equipment (UE) that has a connection supported by the P-CSCF node;
receive an indication that a first S-CSCF node of the multiple S-CSCF nodes is unresponsive, wherein the first S-CSCF node was also associated with the connection of the specific UE;
select, based on the information about one or more capabilities, a second S-CSCF node to replace the first S-CSCF node for the connection of the specific UE;
receiving, from the second S-CSCF node, a request for the information about the P-CSCF node; and
provide at least a portion of the information about the P-CSCF node to the second S-CSCF node.
13 . The system of claim 12 , wherein the second S-CSCF node is caused to be configured to replace the first S-CSCF node using the received portion of the information about the P-CSCF node.
14 . The system of claim 13 , wherein the second S-CSCF node is configured to replace the first S-CSCF node before communicating with the P-CSCF node.
15 . The system of claim 12 , wherein the information about the P-CSCF node is received at the HSS when the specific UE is registered with the HSS.
16 . The system of claim 12 , wherein the information about the P-CSCF node is received at the HSS on a periodic basis.