10.1.5 UE-requested PDU session modification
38.523-13GPP5GSPart 1: ProtocolRelease 17TSUser Equipment (UE) conformance specification
10.1.5.1 UE-requested PDU session modification
10.1.5.1.1 Test Purpose (TP)
(1)
with { UE in PDU SESSION ACTIVE state and in 5GMM-CONNECTED mode }
ensure that {
when { UE is requested to modify of PDU session }
then { UE sends a PDU SESSION MODIFICATION REQUEST message }
}
10.1.5.1.2 Conformance requirements
References: The conformance requirements covered in the present TC are specified in: TS 24.501, clause 6.4.2.1 and 6.4.2.2. Unless otherwise stated these are Rel-15 requirements.
[TS 24.501, clause 6.4.2.1]
The purpose of the UE-requested PDU session modification procedure is:
a) to enable the UE to request modification of a PDU session;
b) to indicate a change of 3GPP PS data off UE status for a PDU session;
c) to revoke the previously indicated support for reflective QoS;
d) to request specific QoS handling and segregation of service data flows;
e) to indicate to the network the relevant 5GSM parameters and capabilities (e.g. the UE’s 5GSM capabilities, whether the UE supports more than 16 packet filters, the maximum data rate per UE for user-plane integrity protection supported by the UE for uplink and the maximum data rate per UE for user-plane integrity protection supported by the UE for downlink) for a PDN connection established when in S1 mode, after the first inter-system change from S1 mode to N1 mode, if the UE is operating in single-registration mode in the network supporting N26 interface; or
f) to delete one or more mapped EPS bearer contexts.
NOTE: The UE does not request a PDU session modification for an LADN when the UE is located outside the LADN service area.
[TS 24.501, clause 6.4.2.2]
In order to initiate the UE-requested PDU session modification procedure, the UE shall create a PDU SESSION MODIFICATION REQUEST message.
The UE shall allocate a PTI value currently not used and shall set the PTI IE of the PDU SESSION MODIFICATION REQUEST message to the allocated PTI value.
The UE shall not perform the UE-requested PDU session modification procedure for an emergency PDU session.
The UE shall not perform the UE-requested PDU session modification procedure for a PDU session for LADN when the UE is located outside the LADN service area.
If the UE requests a specific QoS handling, the UE shall include the requested QoS rules IE indicating requested QoS rules and the requested QoS flow descriptions IE indicating requested QoS flow descriptions for the specific QoS handling. The QoS rules IE includes the packet filters which describe the service data flows requested by the UE. The specific QoS parameters requested by the UE is specified in the QoS flow descriptions IE. If the UE requests the network to bind specific service data flows to a dedicated QoS flow, the UE shall create a new QoS rule by setting the rule operation code to "Create new QoS rule" and shall set the segregation bit to "Segregation requested" for the corresponding QoS rule in the QoS rules IE. The UE shall set the QRI values to "no QoS rule identifier assigned" in the requested QoS rules IE, if the QoS rules are newly created; otherwise, the UE shall set the QRI values to those of the existing QoS rules for which the specific QoS handling applies. The UE shall set the QFI values to "no QoS flow identifier assigned" in the requested QoS flow descriptions IE, if the QoS flow descriptions are newly created; otherwise, the UE shall set the QFI values to the QFIs of the existing QoS flow descriptions for which the specific QoS handling applies.
…
If the UE is performing the PDU session modification procedure to request the deletion of a non-default QoS rule due to errors in QoS operations or packet filters, the UE shall include the 5GSM cause IE in the PDU SESSION MODIFICATION REQUEST message as described in subclause 6.4.1.3.
Even if the timer T3396, T3584, or T3585 is running or is deactivated, the UE shall indicate a change of 3GPP PS data off UE status associated to a PDU session, by including the extended protocol configuration options IE in the PDU SESSION MODIFICATION REQUEST message and setting the 3GPP PS data off UE status.
For a PDN connection established when in S1 mode, after the first inter-system change from S1 mode to N1 mode, if the UE is operating in single-registration mode in the network supporting N26 interface and the UE requests the PDU session to be an always-on PDU session in the 5GS, the UE shall include the Always-on PDU session requested IE and set the value of the IE to "Always-on PDU session requested" in the PDU SESSION MODIFICATION REQUEST message.
The UE shall transport the PDU SESSION MODIFICATION REQUEST message, the PDU session ID, and the request type set to "modification request", using the NAS transport procedure as specified in subclause 5.4.5, and the UE shall start timer T3581 (see example in figure 6.4.2.2.1).
10.1.5.1.3 Test description
10.1.5.1.3.1 Pre-test conditions
System Simulator:
– NGC Cell A.
UE:
– None.
Preamble:
– The UE is in state 3N-A on NGC Cell A with PDU SESSION ACTIVE according to TS 38.508-1 [4].
10.1.5.1.3.2 Test procedure sequence
Table 10.1.5.1.3.2-1: Main behaviour
|
St |
Procedure |
Message Sequence |
TP |
Verdict |
|
|
U – S |
Message |
||||
|
1 |
Cause the UE to pdu session modification with the previously established PDN session at preamble. (see Note) |
– |
– |
– |
– |
|
2 |
Check: Does the UE transmit a PDU SESSION MODIFICATION REQUEST message? |
–> |
PDU SESSION MODIFICATION REQUEST |
1 |
P |
|
3 |
The SS transmits an PDU SESSION MODIFICATION COMMAND message. |
<– |
PDU SESSION MODIFICATION COMMAND |
– |
– |
|
4 |
the UE transmit an PDU SESSION MODIFICATION COMPLETE message. |
–> |
PDU SESSION MODIFICATION COMPLETE |
– |
– |
|
Note: The request of pdu session modification may be performed by MMI or AT command. |
|||||
10.1.5.1.3.3 Specific message contents
Table 10.1.5.1.3.3-1: PDU SESSION MODIFICATION COMMAND (step 3, Table 10.1.5.1.3.2-1)
|
Derivation path: TS 38.508-1, Table 4.7.2-9 |
||||
|
Information Element |
Value/remark |
Comment |
Condition |
|
|
PDU session ID |
The value indicated in PDU SESSION MODIFICATION REQUEST |
|||
|
PTI |
The value indicated in PDU SESSION MODIFICATION REQUEST |
|||
|
Authorized QoS rules |
According to QoS rule #n as defined in TS 38.508-1 [4], Table 4.8.4-1 except for Rule operation code set to ‘100’B and QoS rule precedence set to ‘0000 0010’- see TS 38.508-1 [4] , clause 4.8.2.1 |
‘n’ in QoS rule#n corresponds to the default PDU session type as set in the PICS pc_APN_Default_Configuration |
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