Failure handling for missing session parameters
Solutions are disclosed that provide failure handling for missing session parameters in wireless network messaging. When a service-based interface (SBI) message received by a control plane node, such as a session management function (SMF), is missing a session parameter (e.g., allocation and retention priority (ARP) or bandwidth value), rather than responding with a rejection, failure handling fills in the missing parameter using pre-configured tables. The type of received message, along with another parameter in the message, such as a QoS identifier, is used in a mapping table to identify a default value to supply as the missing parameter. This approach may be used in other network messages in which certain parameter values are commonly used together in particular types of messages, such as the given example of QoS identifier, ARP value, and bandwidth value.
1 . A method of wireless communication, the method comprising:
receiving, by a session management node of a wireless network, from a policy node of the wireless network, a first service-based interface (SBI) message for establishing a user plane session for a user equipment (UE);
parsing, by the session management node, the first SBI message;
determining, by the session management node, that a session parameter is missing from the first SBI message;
determining, by the session management node, a value for the missing session parameter;
generating, by the session management node, a second SBI message for establishing the user plane session, the second SBI message including the value for the missing session parameter;
transmitting, by the session management node, to a mobility node of the wireless network, the second SBI message for establishing the user plane session; and
establishing the user plane session for the UE using the second SBI message.
2 . The method of claim 1 , wherein the first SBI message comprises an N7 Create Response; and wherein the user plane session comprises a default bearer.
3 . The method of claim 1 , wherein the first SBI message comprises an N7 Update Notification or an N7 Update Response, and wherein the user plane session comprises a dedicated bearer.
4 . The method of claim 1 , wherein determining the value for the missing session parameter comprises:
using a quality of service (QoS) identifier included in the first SBI message with a mapping table that maps QoS identifier values to values for the missing session parameter.
5 . The method of claim 1 , wherein the session parameter comprises a quality of service (QoS) parameter.
6 . The method of claim 5 , wherein the QoS parameter comprises an allocation and retention priority (ARP) value or a bandwidth value.
7 . A system comprising:
a processor; and
a computer-readable medium storing programing instructions for execution by the processor, the programming instructions, upon execution by the processor, causing the system to perform the following operations:
receiving, by a session management node of a wireless network, from a policy node of the wireless network, a first service-based interface (SBI) message for establishing a user plane session for a user equipment (UE);
parsing, by the session management node, the first SBI message;
determining, by the session management node, that a session parameter is missing from the first SBI message;
determining, by the session management node, a value for the missing session parameter;
generating at the session management node, a second SBI message for establishing the user plane session, the second SBI message including the value for the missing session parameter;
transmitting, by the session management node, to a mobility node of the wireless network, the second SBI message for establishing the user plane session; and
establishing the user plane session for the UE using the second SBI message.
8 . The system of claim 7 , wherein the SBI first message comprises an N7 Create Response, and wherein the user plane session comprises a default bearer.
9 . The system of claim 7 , wherein determining the value for the missing session parameter comprises:
using a quality of service (QoS) identifier included in the first message with a mapping table that maps QoS identifier values to values for the missing session parameter.
10 . The system of claim 7 , wherein the session parameter comprises a quality of service (QoS) parameter and an allocation & retention priority (ARP) value.
11 . One or more computer storage devices having computer-executable instructions stored thereon, which, upon execution by a computer, cause the computer to perform operations comprising:
receiving, by a session management node of a wireless network, from a policy node of the wireless network, a first service-based interface (SBI) message for establishing a user plane session for a user equipment (UE);
parsing, by the session management node, the first SBI message;
determining, by the session management node, that a session parameter is missing from the first SBI message;
determining, by the session management node, a value for the missing session parameter;
generating at the session management node, a second SBI message for establishing the user plane session, the second SBI message including the value for the missing session parameter;
transmitting, by the session management node, to a mobility node of the wireless network, the second SBI message for establishing the user plane session; and
establishing the user plane session for the UE using the second SBI message.
12 . The one or more computer storage devices of claim 11 , wherein the first SBI message comprises an N7 Create Response, and wherein the user plane session comprises a default bearer.
13 . The one or more computer storage devices of claim 11 , wherein determining the value for the missing session parameter comprises:
using a quality of service (QoS) identifier included in the SBI first message with a mapping table that maps QoS identifier values to values for the missing session parameter.
14 . The one or more computer storage devices of claim 13 , wherein the QoS identifier comprises a fifth generation (5G) QoS identifier (5QI), and wherein the mapping table is specific to a type of the first SBI message.
15 . The one or more computer storage devices of claim 11 , wherein the session parameter comprises a quality of service (QoS) parameter and an allocation & retention priority (ARP) value.
16 . The system of claim 7 , wherein the SBI first message comprises an N7 Update Notification or an N7 Update Response, and wherein the user plane session comprises a dedicated bearer.
17 . The system of claim 7 , wherein the session parameter comprises a quality of service (QoS) parameter and a bandwidth value.
18 . The one or more computer storage devices of claim 11 , wherein the SBI first message comprises an N7 Update Notification or an N7 Update Response, and wherein the user plane session comprises a dedicated bearer.
19 . The one or more computer storage devices of claim 11 , wherein the session parameter comprises a quality of service (QoS) parameter and a bandwidth value.