PDU session updating method and network side equipment

[0116] First, when the GUTI is a 5G GUTI, and the mobile country code MCC and mobile network code MNC in the GUTI are different from the MCC and MNC in the current PLMN, it is determined that the UE moves across PLMNs.

[0117]Second, when the GUTI is a Mapped 5G GUTI, determine that the UE moves across systems.

[0118] In the embodiment of the present invention, the cross-PLMN movement of the UE may include but not limited to the following situations:

[0119] UE moves from HPLMN to VPLMN;

[0120] UE moves from VPLMN to HPLMN;

[0121] The UE moves from the original VPLMN to the current VPLMN.

[0122] The cross-system movement of the UE may include but not limited to: the UE moves from the EPS to the 5GS.

[0123] In the embodiment of the present invention, the network side device determines that the UE has a first PDU session in which the PDU session anchor point SMF is not in the current PLMN, which may include but not limited to the following two implementations:

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[0148] Such as figure 2 As shown, a method for updating a PDU session includes the following steps:

[0149] Step 201: UE sends a registration request due to moving from HPLMN to VPLMN;

[0150] Step 202: The New AMF of the VPLMN receives the UE request, and determines that the UE has moved across PLMNs according to the old GUTI (5G GUTI) in the message. Specifically, according to the MCC (mobile country code, mobile country code) and MNC (Mobile Network code, mobile network code) in the old GUTI are different from the MCC and MNC of the PLMN ID, it is determined that the UE has moved across PLMNs.

[0151] Step 203: The new AMF obtains the UE context from the old AMF indicated by the old GUTI, and the UE context includes all PDU session information.

[0152] Step 204: New AMF obtains the relevant information of the PDU session, including the DNN used, whether the DNN allows the use of LBO, the S-NSSAI used, the PDU session anchor SMF, etc., and then for the PDU session anc...

[0158] Such as image 3 As shown, a method for updating a PDU session includes the following steps:

[0159] Step 301: UE sends a registration request due to moving from one VPLMN to another VPLMN.

[0160] Step 302: The new AMF of the New VPLMN receives the UE request, and determines that the UE has moved across PLMNs according to the old GUTI (5G GUTI) in the message. Specifically, according to the MCC (mobile country code, mobile country code) and MNC (Mobile Network code, mobile network code) in the old GUTI are different from the MCC and MNC of the PLMN ID, it is determined that the UE has moved across PLMNs.

[0161] Step 303: The new AMF obtains the UE context from the old AMF indicated by the old GUTI, and the UE context includes the UE identity and all PDU session information.

[0162] Step 304: According to the Old GUTI and UE's SUPI (Subscription Permanent Identity, subscription permanent identity) (the MCC and MNC in the old GUTI and SUPI are different), the New ...