Method And Apparatus For Single Network Slice Selection Assistance Information Based Congestion Control In Mobile Communications

Abstract

Various solutions for single network slice selection assistance information (S-NSSAI) based congestion control with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a message with a back-off timer from the network node. The apparatus may determine whether an S-NSSAI of a protocol data unit (PDU) session is provided by the network node. The apparatus may start the back-off timer and associate the back-off timer with the S-NSSAI of the PDU session in an event that the S-NSSAI is provided by the network node.

What is claimed is: 
     
         1 . A method, comprising:
 receiving, by a processor of an apparatus, a 5th generation session management (5GSM) message with a back-off timer from a network node of a wireless network;   starting, by the processor, the back-off timer;   associating, by the processor, the back-off timer with a mapped single-network slice selection assistance information (S-NSSAI) part of an S-NSSAI value provided by the apparatus to the wireless network; and   in an event that the apparatus is in a roaming scenario:
 determining, by the processor, whether a mapped S-NSSAI of a protocol data unit (PDU) session of another 5GSM message is same as the mapped S-NSSAI associated with the back-off timer; and 
 stopping, by the processor, the back-off timer responsive to a positive result from the determining. 
   
     
     
         2 . The method of  claim 1 , further comprising:
 determining, by the processor, whether an S-NSSAI of a request message is the S-NSSAI associated with the back-off timer; and   forbidding, by the processor, a transmission of the request message in an event that the S-NSSAI of the request message is the S-NSSAI associated with the back-off timer,   wherein the request message is a PDU session establishment request message or a PDU session modification request message.   
     
     
         3 . The method of  claim 1 , further comprising:
 transferring, by the processor, from a first public land mobile network (PLMN) to a second PLMN; and   receiving, by the processor, the S-NSSAI associated with the second PLMN from the network node.   
     
     
         4 . The method of  claim 1 , wherein the back-off timer comprises at least one of a congestion back-off timer T3584 and a congestion back-off timer T3585. 
     
     
         5 . The method of  claim 2 , wherein when the back-off timer is applied in all public land mobile networks (PLMNs), the S-NSSAI of the request message comprises a mapped home public land mobile network (HPLMN) S-NSSAI of the PDU session or a mapped HPLMN S-NSSAI of a PDU session establishment request, and wherein the S-NSSAI associated with the back-off timer comprises the mapped HPLMN S-NSSAI. 
     
     
         6 . A method, comprising:
 receiving, by a processor of an apparatus, a 5th generation session management (5GSM) message with a back-off timer from a network node of a wireless network;   starting, by the processor, the back-off timer;   associating, by the processor, the back-off timer with a mapped single-network slice selection assistance information (S-NSSAI) part of an S-NSSAI value provided by the apparatus to the wireless network; and   in an event that the apparatus is in a non-roaming scenario:
 determining, by the processor, whether an S-NSSAI or a mapped S-NSSAI of a protocol data unit (PDU) session of another 5GSM message is same as the mapped S-NSSAI associated with the back-off timer; and 
 stopping, by the processor, the back-off timer responsive to a positive result from the determining. 
   
     
     
         7 . The method of  claim 6 , further comprising:
 determining, by the processor, whether an S-NSSAI of a request message is the S-NSSAI associated with the back-off timer; and   forbidding, by the processor, a transmission of the request message in an event that the S-NSSAI of the request message is the S-NSSAI associated with the back-off timer,   wherein the request message is a PDU session establishment request message or a PDU session modification request message.   
     
     
         8 . The method of  claim 6 , further comprising:
 transferring, by the processor, from a first public land mobile network (PLMN) to a second PLMN; and   receiving, by the processor, the S-NSSAI associated with the second PLMN from the network node.   
     
     
         9 . The method of  claim 6 , wherein the back-off timer comprises at least one of a congestion back-off timer T3584 and a congestion back-off timer T3585. 
     
     
         10 . The method of  claim 7 , wherein when the back-off timer is applied in all public land mobile networks (PLMNs), the S-NSSAI of the request message comprises a mapped home public land mobile network (HPLMN) S-NSSAI of the PDU session or a mapped HPLMN S-NSSAI of a PDU session establishment request, and wherein the S-NSSAI associated with the back-off timer comprises the mapped HPLMN S-NSSAI. 
     
     
         11 . An apparatus, comprising:
 a transceiver which, during operation, wirelessly communicates with a network node of a wireless network; and   a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:
 receiving, via the transceiver, a 5th generation session management (5GSM) message with a back-off timer from the network node of the wireless network; 
 starting the back-off timer; 
 associating the back-off timer with a mapped single-network slice selection assistance information (S-NSSAI) part of an S-NSSAI value provided by the apparatus to the wireless network; and 
 in an event that the apparatus is in a roaming scenario:
 determining whether a mapped S-NSSAI of a protocol data unit (PDU) session of another 5GSM message is same as the mapped S-NSSAI associated with the back-off timer; and 
 stopping the back-off timer responsive to a positive result from the determining. 
 
   
     
     
         12 . The apparatus of  claim 11 , wherein the processor is configured to perform further operations comprising:
 determining, by the processor, whether an S-NSSAI of a request message is the S-NSSAI associated with the back-off timer; and   forbidding, by the processor, a transmission of the request message in an event that the S-NSSAI of the request message is the S-NSSAI associated with the back-off timer,   wherein the request message is a PDU session establishment request message or a PDU session modification request message.   
     
     
         13 . The apparatus of  claim 11 , wherein the processor is configured to perform further operations comprising:
 transferring, by the processor, from a first public land mobile network (PLMN) to a second PLMN; and   receiving, by the processor, the S-NSSAI associated with the second PLMN from the network node.   
     
     
         14 . The apparatus of  claim 11 , wherein the back-off timer comprises at least one of a congestion back-off timer T3584 and a congestion back-off timer T3585. 
     
     
         15 . The apparatus of  claim 12 , wherein when the back-off timer is applied in all public land mobile networks (PLMNs), the S-NSSAI of the request message comprises a mapped home public land mobile network (HPLMN) S-NSSAI of the PDU session or a mapped HPLMN S-NSSAI of a PDU session establishment request, and wherein the S-NSSAI associated with the back-off timer comprises the mapped HPLMN S-NSSAI. 
     
     
         16 . An apparatus, comprising:
 a transceiver which, during operation, wirelessly communicates with a network node of a wireless network; and   a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:
 receiving, via the transceiver, a 5th generation session management (5GSM) message with a back-off timer from the network node of the wireless network; 
 starting the back-off timer; 
 associating the back-off timer with a mapped single-network slice selection assistance information (S-NSSAI) part of an S-NSSAI value provided by the apparatus to the wireless network; and 
 in an event that the apparatus is in a non-roaming scenario:
 determining whether an S-NSSAI or a mapped S-NSSAI of a protocol data unit (PDU) session of another 5GSM message is same as the mapped S-NSSAI associated with the back-off timer; and 
 stopping the back-off timer responsive to a positive result from the determining. 
 
   
     
     
         17 . The apparatus of  claim 16 , wherein the processor is configured to perform further operations comprising:
 determining, by the processor, whether an S-NSSAI of a request message is the S-NSSAI associated with the back-off timer; and   forbidding, by the processor, a transmission of the request message in an event that the S-NSSAI of the request message is the S-NSSAI associated with the back-off timer,   wherein the request message is a PDU session establishment request message or a PDU session modification request message.   
     
     
         18 . The apparatus of  claim 16 , wherein the processor is configured to perform further operations comprising:
 transferring, by the processor, from a first public land mobile network (PLMN) to a second PLMN; and   receiving, by the processor, the S-NSSAI associated with the second PLMN from the network node.   
     
     
         19 . The apparatus of  claim 16 , wherein the back-off timer comprises at least one of a congestion back-off timer T3584 and a congestion back-off timer T3585. 
     
     
         20 . The apparatus of  claim 17 , wherein when the back-off timer is applied in all public land mobile networks (PLMNs), the S-NSSAI of the request message comprises a mapped home public land mobile network (HPLMN) S-NSSAI of the PDU session or a mapped HPLMN S-NSSAI of a PDU session establishment request, and wherein the S-NSSAI associated with the back-off timer comprises the mapped HPLMN S-NSSAI.