Control of network slice
A visited session management function of a visited public land mobile network (PLMN) sends, to a home session management function of a home PLMN of a wireless device, a request of the wireless device for a packet data unit, PDU, session in a network slice. The visited session management function receives, from the home session management function, a cause value indicating that a network slice quota of the home PLMN has been reached for a number of PDU sessions for the network slice.
1 . A method, comprising:
receiving, by a visited session management function (SMF) of a visited public land mobile network (PLMN) from a visited access and mobility management function (AMF) of the visited PLMN, a first request indicating:
a first home slice identifier of a first home network slice of a plurality of home network slices of a home PLMN of a wireless device;
a first visited identifier corresponding to the first home slice identifier; and
an identifier of a home SMF of the home PLMN of the wireless device;
sending, by the visited SMF to the home SMF and based on the first request, a request of the wireless device for a packet data unit (PDU) session in the first home network slice;
receiving, by the visited SMF from the home SMF, a message indicating rejection of the request by the home SMF, the message comprising a cause value indicating that a home network slice quota of the home PLMN has been reached for a number of PDU sessions for the first home network slice; and
sending, by the visited SMF to the wireless device and based on the rejection by the home SMF, a PDU session reject message comprising:
the cause value received from the home SMF;
an identifier of a second home network slice; and
a re-attempt indicator indicating the wireless device to establish a second PDU session with the second home network slice, wherein the wireless device re-attempts to establish the second PDU session with the second home network slice.
2 . The method of claim 1 , further comprising receiving, by the visited SMF from the wireless device, a PDU session establishment request comprising the request for the PDU session in the first network slice.
3 . The method of claim 2 , wherein the PDU session establishment request comprises one or more network slice identifiers comprising a single network slice selection assistance information, S-NSSAI, of the first network slice.
4 . The method of claim 1 , wherein the visited SMF sends the request of the wireless device to the SMF in a create session management context request message.
5 . The method of claim 4 , wherein the create session management context request message comprises one or more of:
a visited network slice identifier of a network slice of the visited PLMN; and
a home network slice identifier of a network slice of the home PLMN.
6 . The method of claim 1 , wherein the cause value is received from the home SMF in a create session management context response message.
7 . A visited session management function (SMF), of a visited PLMN, comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the visited SMF to:
receive, from a visited access and mobility management function (AMF) of the visited PLMN, a first request indicating:
a first home slice identifier of a first home network slice of a plurality of home network slices of a home PLMN of a wireless device;
a first visited identifier corresponding to the first home slice identifier; and
an identifier of a home SMF of the home PLMN of the wireless device;
send, to the home SMF and based on the first request, a request of the wireless device for a packet data unit (PDU) session in the first home network slice;
receive, from the home SMF, a message indicating rejection of the request by the home SMF, the message comprising a cause value indicating that a home network slice quota of the home PLMN has been reached for a number of PDU sessions for the first home network slice; and
send, to the wireless device and based on the rejection by the home SMF, a PDU session reject message comprising:
the cause value received from the home SMF;
an identifier of a second home network slice; and
a re-attempt indicator indicating the wireless device to establish a second PDU session with the second home network slice, wherein the wireless device re-attempts to establish the second PDU session with the second home network slice.
8 . The visited SMF of claim 7 , wherein the instructions further cause the visited SMF to receive, from the wireless device, a PDU session establishment request comprising the request for the PDU session in the first network slice.
9 . The visited SMF of claim 8 , wherein the PDU session establishment request comprises one or more network slice identifiers comprising a single network slice selection assistance information, S-NSSAI, of the first network slice.
10 . The visited SMF of claim 7 , wherein the instructions further cause the visited SMF to send the request of the wireless device to the SMF in a create session management context request message.
11 . The visited SMF of claim 10 , wherein the create session management context request message comprises one or more of:
a visited network slice identifier of a network slice of a visited PLMN; and
a home network slice identifier of a network slice of the home PLMN.
12 . The visited SMF of claim 7 , wherein the cause value is received from the home SMF in a create session management context response message.
13 . A system, comprising:
a visited session management function (SMF) comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the visited SMF to:
receive, from a visited access and mobility management function (AMF) of the visited PLMN, a first request indicating:
a first home slice identifier of a first home network slice of a plurality of home network slices of a home PLMN of a wireless device;
a first visited identifier corresponding to the first home slice identifier; and
an identifier of a home SMF of the home PLMN of the wireless device;
send, to the home SMF and based on the first request, a request of the wireless device for a packet data unit (PDU) session in the first home network slice;
receive, from the home SMF, a message indicating rejection of the request by the home SMF, the message comprising a cause value indicating that a home network slice quota of the home PLMN has been reached for a number of PDU sessions for the first home network slice; and
send, to the wireless device and based on the rejection by the home SMF, a PDU session reject message comprising send, to the wireless device and based on the rejection by the home SMF, a PDU session reject message comprising:
the cause value received from the home SMF;
an identifier of a second home network slice; and
a re-attempt indicator indicating the wireless device to establish a second PDU session with the second home network slice, wherein the wireless device re-attempts to establish the second PDU session with the second home network slice; and
the home SMF comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the home SMF to:
receive, from the visited SMF, the request of the wireless device for establishing the PDU session in the first home network slice; and
send, to the visited SMF, the message indicating rejection of the request by the home SMF, the message comprising:
the cause value indicating that the home network slice quota of the home PLMN has been reached for the number of PDU sessions for the first home network slice;
the identifier of the second home network slice; and
the re-attempt indicator.