Monitoring QoS parameters of a data connection

1. An apparatus for wireless communication of a user plane function (“UPF”), comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UPF to:

receive, from a session management function node (“SMF”), a request to monitor a quality of service (“QoS”) parameter for a data connection between a user equipment (“UE”) and the UPF, wherein the request indicates a condition for reporting a measured value of the QoS parameter and a reporting period for the measured value;

receive, from an access network node, a report of a first delay amount for a packet between the UE and the access network node;

calculate a second delay amount for a portion of the data connection between the access network node and the UPF; and

determine a measured value of the QoS parameter based on the first and second delay amounts.

2. The apparatus of claim 1 , wherein the condition for reporting the measured value indicates a periodic reporting or an event-based reporting, and wherein the request further indicates a reporting threshold for the measured value of the QoS parameter in response to the condition indicating the event-based reporting.

3. The apparatus of claim 1 , wherein the request to monitor the QoS parameter indicates at least one of: a specific data connection, one or more QoS parameters to be monitored, or a combination thereof.

4. The apparatus of claim 2 , wherein the at least one processor is further configured to cause the UPF to:

transmit, to the SMF, a QoS measurement report containing the measured value of the QoS parameter in response to the measured value of the QoS parameter exceeding the reporting threshold for the measured value; and

transmit, to the SMF, the QoS measurement report in response to the reporting period being satisfied.

5. The apparatus of claim 1 , wherein the measured value of the QoS parameter comprises the sum of the first delay amount and second delay amount.

6. The apparatus of claim 1 , wherein the at least one processor is further configured to cause the UPF to:

transmit a General Packet Radio Service Tunneling Protocol User Plane (“GTP-U”) echo request message to the access network node and

receive an echo response message, wherein the access network node is in a user plane path of the data connection.

7. The apparatus of claim 6 , wherein to calculate the second delay amount, the at least one processor is configured to cause the UPF to calculate half of the round-trip time (“RTT”) between the UPF and the access network node, wherein the RTT is calculated by measuring a time difference between transmitting the GTP-U echo request message and receiving the echo response message.

8. The apparatus of claim 6 , wherein to receive the report of a first delay amount, the at least one processor is configured to cause the UPF to receive the report at a first periodicity, wherein the transmission of the GTP-U echo request occurs at a second periodicity greater than the first periodicity.

9. The apparatus of claim 1 , wherein the QoS parameter comprises at least one of: an uplink packet delay budget, downlink packet delay budget, an uplink delay jitter, a downlink delay jitter, an uplink packet error rate, a downlink packet error rate, or a combination thereof.

10. An apparatus for wireless communication of a session management function (“SMF”), comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the SMF to:

transmit, to a user plane function node (“UPF”), a first request to monitor a quality of service (“QoS”) parameter for a data connection between a user equipment (“UE”) and the UPF, wherein the request indicates at least one of: a condition for reporting a measured value of the QoS parameter and a reporting period for the measured value or a reporting threshold for reporting a measured value, or a combination thereof;

transmit, to an access network node, a second request to monitor the QoS parameter for a portion of the data connection between the UE and the access network node, wherein the UPF and access network node are part of a user plane path of the data connection; and

receive, from the UPF, receiving a monitoring report indicating a measured value of the QoS parameter.

11. The apparatus of claim 10 , wherein the first and second requests to monitor the QoS parameter indicates at least one of: a specific data connection, one or more QoS parameters to be monitored, a reporting frequency, or a combination thereof.

12. The apparatus of claim 10 , wherein the at least one processor is further configured to cause the SMF to modify a QoS flow of the data connection based on the monitoring report.

13. The apparatus of claim 10 , wherein the QoS parameter comprises at least one of: an uplink packet delay budget, downlink packet delay budget, an uplink delay jitter, a downlink delay jitter, an uplink packet error rate, a downlink packet error rate, or a combination thereof.

14. An access network apparatus for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the access network apparatus to:

receive, from a session management function node (“SMF”), a request to monitor a quality of service (“QoS”) parameter for a data connection between a user equipment (“UE”) and the access network apparatus, wherein the request indicates a reporting frequency for a measured value of the QoS parameter;

measure a first delay amount for a packet over a radio interface of the remote unit; and

transmit a report of the first delay amount to a user plane function node (“UPF”) in a user plane path of the data connection.

15. The access network apparatus of claim 14 , wherein the request to monitor the QoS parameter indicates at least one of: a specific data connection, one or more QoS parameters to be monitored, a reporting frequency, or a combination thereof.

16. The access network apparatus of claim 14 , wherein to transmit the report of a first delay amount, the at least one processor is configured to cause the access network apparatus to transmit the report with a periodicity calculated based on the reporting frequency.

17. The access network apparatus of claim 14 , wherein the at least one processor is further configured to cause the access network apparatus to receive a General Packet Radio Service Tunneling Protocol User Plane (“GTP-U”) echo request message from the UPF, wherein to transmit the report to the UPF, the at least one processor is configured to cause the access network apparatus to transmit a GTP-U echo response message to the UPF.

18. The access network apparatus of claim 14 , wherein the QoS parameter comprises at least one of: an uplink packet delay budget, downlink packet delay budget, an uplink delay jitter, a downlink delay jitter, an uplink packet error rate, a downlink packet error rate, or a combination thereof.

19. The access network apparatus of claim 14 , wherein the at least one processor is further configured to cause the access network apparatus to transmit a message to the UPF for measuring a second delay amount, wherein the UPF determines a measured value of the QoS parameter using the first and second delay amounts.

20. A system comprising:

a session management function node (“SMF”) that:

transmits to a user plane function node (“UPF”) a first request to monitor a quality of service (“QoS”) parameter for a data connection of a remote unit, between a user equipment (“UE”) and the UPF, wherein the request indicates at least one of: a reporting condition for reporting a measured value of the QoS parameter or a reporting period for the measured value or a reporting threshold for the measured value, or a combination thereof; and

transmits to an access network node a second request to monitor the QoS parameter for a portion of the data connection between the UE and the access network node, the UPF and access network node being part of a user plane path of the data connection;

wherein the access network node:

measures a first delay amount for a packet between the UE and the access network node;

transmits a report of the first delay amount to the UPF;

wherein the UPF:

calculates a second delay amount for a portion of the data connection between the access network node and the UPF,

determines a measured value of the QoS parameter based on the first and second delay amounts, and

transmits a monitoring report to the SMF, the monitoring report indicating the measured value of the QoS parameter.