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Content for  TS 23.122  Word version:  17.1.1

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C.4  Enhanced CP-SOR in connected mode |R17|Word‑p. 78

C.4.1  General

The HPLMN, based on operator policy, may provide the UE with SOR-CMCI to control the timing when the UE enters idle mode and perform higher priority PLMN /access technology selection. This is achieved by the HPLMN indicating to the UE the criteria for releasing specific PDU session(s) or services to enter idle mode.
The HPLMN may configure the SOR-CMCI in the UE, and may also provide the SOR-CMCI to the UE over N1 NAS signalling. The SOR-CMCI received over N1 NAS signalling takes precedence over the SOR-CMCI configured in the UE.
SOR-CMCI consists of the following parameters:
  1. criteria consisting of zero, one or more PDU session attribute criterion types and zero, one or more service criteria types:
    1. PDU session attribute type criterion:
      1. DNN of the PDU session; and
      2. S-NSSAI of the PDU session;
    2. service type criterion:
      1. IMS registration related signalling;
      2. MMTEL voice call;
      3. MMTEL video call;
      4. MO SMS over NAS or MO SMSoIP; and
    3. match all type criterion; and
  2. a value for Tsor-cm timer associated with each criterion presented in i) indicating the time the UE shall wait before releasing the PDU sessions and entering idle mode.
If there are more than one criterion applicable for a PDU session (ex. a criterion for the PDU session and another one for the service) then the timer Tsor-cm with the highest value shall apply.
If the value for Tsor-cm timer equals "infinity" then the UE shall wait until the PDU session(s) is released or the service is stopped.
The timer Tsor-cm is applicable only if the UE is in automatic network selection mode.
The UE shall consider the following services as exempted from being forced to release the related established PDU session to enter idle mode and perform high priority PLMN/Access technology selection. These services are known to the UE by default and the UE shall not follow the SOR-CMCI criteria even if configured to interrupt such services:
  1. emergency services.
The UE configured with high priority access in the selected PLMN shall consider all services to be exempted from being forced to release the related established PDU session to enter idle mode and perform high priority PLMN/Access technology selection.
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C.4.2  Applying SOR-CMCI in the UEWord‑p. 79
During SOR procedure and while applying SOR-CMCI, the UE shall determine the time to release the PDU session(s) as follows:
  • The SOR-CMCI rules included in SOR-CMCI, where for each criterion:
    1. DNN of the PDU session:
      the UE shall check whether it has a PDU session with a DNN matching to the DNN included in SOR-CMCI, and if any, the UE shall set the associated timer Tsor-cm to the value included in the SOR-CMCI;
    2. S-NSSAI of the PDU session:
      the UE shall check whether it has a PDU session with a S-NSSAI matching the S-NSSAI included in SOR-CMCI, and if any, the UE shall set the associated timer Tsor-cm to the value included in the SOR-CMCI;
    3. IMS registration related signalling:
      the UE shall check whether IMS registration related signalling is ongoing as specified in TS 24.501, and if it is ongoing, the UE shall set the associated timer Tsor-cm to the value included in the SOR-CMCI;
    4. MMTEL voice call:
      the UE shall check whether MMTEL voice call is ongoing as specified in TS 24.501, and if it is ongoing, the UE shall set the associated timer Tsor-cm to the value included in the SOR-CMCI;
    5. MMTEL video call:
      the UE shall check whether MMTEL video call is ongoing as specified in TS 24.501, and if it is ongoing, the UE shall set the associated timer Tsor-cm to the value included in the SOR-CMCI;
    6. MO SMS over NAS or MO SMSoIP:
      the UE shall check whether MO SMS over NAS or MO SMSoIP services is ongoing as specified in TS 24.501, and if it is ongoing, the UE shall set the associated timer Tsor-cm to the value included in the SOR-CMCI; or
    7. match all:
      the UE shall set the associated timer Tsor-cm to the value included in the SOR-CMCI;
  • otherwise, the UE shall consider the timer value for Tsor-cm equal to zero.
The UE shall start the timer Tsor-cm.
The timer Tsor-cm stops when the associated PDU session(s) is released or the associated service is stopped. If the value for timer Tsor-cm was selected as the highest among other values included in SOR-CMCI (see subclause C.4.1), then the timer Tsor-cm stops when the associated PDU session(s) for that timer value is release or the associated service is stopped. If the UE enters idle mode or 5GMM-CONNECTED mode with RRC inactive indication (see TS 24.501), while timer Tsor-cm is running, then the UE stops the timer.
When the timer Tsor-cm stops or expires, if the UE has a list of available and allowable PLMNs in the area and based on this list or any other implementation specific means, the UE determines that there is a higher priority PLMN than the selected VPLMN, then the UE shall perform the deregistration procedure (see clause 4.2.2.3 of TS 23.502) that releases all the established PDU sessions and the UE enters idle mode and attempts to obtain service on a higher priority PLMN as specified in subclause 4.4.3.3 by acting as if timer T that controls periodic attempts has expired.
The UE which has an emergency PDU session, receives a request from the upper layers to establish an emergency PDU session or perform emergency services fallback, registers for emergency services, or is configured for high priority access in the selected PLMN is not required to enter idle mode even if the timer Tsor-cm stops or expires. The UE shall attempt to perform the PLMN selection after the emergency PDU session or the high priority service is released.
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$  Change historyWord‑p. 81

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