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EP-4740676-A1 - METHOD AND SYSTEM FOR ESTABLISHING A PACKET DATA UNIT (PDU) SESSION IN A NETWORK

EP4740676A1EP 4740676 A1EP4740676 A1EP 4740676A1EP-4740676-A1

Abstract

The present disclosure relates to a system (108) and a method (400) for establishing Packet Data Unit (PDU) session in a network (106) The system (108) includes a transceiver (310) to transmit a PDU establishment request message to a RAN unit (204). The transceiver (310) transmits a create SM request message to a SMF unit (208). The system (108) includes a generation unit (312) to generate a PDU accept message. The system (108) includes a caching unit to cache, the first SM container. The system (108) includes a setup message generation unit to generate a request message to be transmitted to the RAN unit (204) from the SMF unit (208). The system (108) includes a transmittal unit to transmit a response message from the RAN unit to the SMF unit and, from the AMF unit to the UE unit, thereby establishing a PDU session in the network (106).

Inventors

  • BHATNAGAR, AAYUSH
  • BISHT, BIRENDRA
  • Singh, Harbinder Pal
  • Naskar, Suman
  • KUMAR, PRADEEP
  • Srinivas, Gunna
  • JAIN, SOURABH

Assignees

  • Jio Platforms Limited

Dates

Publication Date
20260513
Application Date
20240626

Claims (20)

  1. 1. A system (108) for Packet Data Unit (PDU) session establishment in a network (106), the system (108) comprising: a transceiver (310) configured to: transmit, a PDU establishment request message to a Radio Access Network (RAN) unit (204) from an at least one User Equipment (UE)(102); transmit, the PDU establishment request message from the RAN unit (204) to an Access and Mobility Management Function (AMF) unit (206), the transmitted PDU establishment request message includes a first Session Management (SM) container attached therein; and transmit, a create SM request message to a Session Management Function (SMF) unit (208) utilizing at least one communication protocol, based on receipt of the first SM container at the AMF unit (206); a generation unit (312) configured to generate, a PDU accept message based on successful interaction between the SMF unit (208) and a plurality of nodes of the network (106), wherein the PDU accept message is attached within the first SM container; a caching unit (314) configured to cache, the first SM container subsequent to attaching the PDU accept message within the first SM container; a setup message generation unit (316) configured to generate, a resource setup request message to be transmitted to the RAN unit (204) from the SMF unit (208) via the AMF unit (206), wherein the resource setup request message includes the first SM container and a second SM container as received from the SMF unit (208); and a transmittal unit (318) configured to transmit, a resource setup response message and the cached first SM container which includes the PDU accept message from the RAN unit (204) to the SMF unit (208) via the AMF unit (206) and, from the AMF unit (206) to the UE unit (102) via the RAN unit (204), respectively, thereby establish a PDU session in the network (106).
  2. 2. The system (108) as claimed in claim 1, wherein on receipt of the create SM request message at the SMF unit (208), the system comprises an establishment unit (320) configured to establish the PDU session and transmit an establishment response to the AMF unit (206).
  3. 3. The system (108) as claimed in claim 1, wherein each of the at least one UE (102) and the RAN unit (204) are coupled to each other via a first interface unit, wherein the first interface is at least one of a N 1 interface.
  4. 4. The system (108) as claimed in claim 1, wherein the PDU establishment request message received by the RAN unit (204) is an N 1 message type and the PDU establishment request message transmitted to the AMF unit (206) is a N2 message type.
  5. 5. The system (108) as claimed in claim 1, wherein the N2 message type is an uplink (UL) Non-Access Stratum (NAS) transport message which further includes at least one of a Network Slice Selection Assistance Information (NSSAI), the PDU session ID, and request type.
  6. 6. The system (108) as claimed in claim 1, wherein the plurality of nodes includes a Unified Data Management (UDM), a User Plane Function (UPF), a Policy Control Function (PCF), and a Charging Function (CHF).
  7. 7. The system (108) as claimed in claim 1, wherein the create SM request message includes at least a Subscriber Permanent Identifier (SUPI), Data Network Name (DNN), Single Network Slice Selection Assistance information (S-NSSAI), PDU Session ID, AMF ID, Request Type, Policy Control Function (PCF) ID, Priority Access, N1 SM container (PDU Session Establishment Request), User location information, Access Type, Permanent Equipment Identifier (PEI), Generic Public Subscription Identifier (GPSI), UE presence in LADN service area, Subscription For PDU Session Status Notification, and DNN Selection Mode.
  8. 8. The system (108) as claimed in claim 1, wherein the PDU accept message includes at least the PDU Session ID, second SM information, and N1 SM container.
  9. 9. The system (108) as claimed in claim 1 , wherein on receipt of the resource setup response message at the SMF unit (208) from the RAN unit (204), the PDU is marked as established in the AMF unit (206).
  10. 10. The system (108) as claimed in claim l,the system (108) comprises: a retransmission message generation unit (322) configured to generate, a retransmission message including the cached first SM container at the AMF unit (206); and a retransmission message transmission unit (322) configured to: transmit, the retransmission message from the AMF unit (206) to the RAN unit (204); and transmit, the message containing the PDU session ID and the establishment response to the at least one UE (102) via the RAN unit (204).
  11. 11. The system (108) as claimed in claimlO, wherein the PDU establishment request message is the retransmitted request message based on a non-successful interaction between the SMF unit (208) and the plurality of nodes of the network within a predefined interval of time.
  12. 12. A method (500) of establishing a Packet Data Unit (PDU) session in a network (106), the method comprising the steps of: transmitting, by one or more processors (302), a PDU establishment request message to a Radio Access Network (RAN) unit (204) from an at least one User Equipment (UE) (102); transmitting, by the one or more processors (302), the PDU establishment request message from the RAN unit (204) to an Access and Mobility Management Function (AMF) unit (206), the transmitted PDU establishment request message includes a first Session Management (SM) container attached therein; transmitting, by the one or more processors (302), a create SM request message to a Session Management Function (SMF) unit (208) utilizing at least one communication protocol, based on receipt of a first SM container at the AMF unit (206); generating, by the one or more processors (302), a PDU accept message based on successful interaction between the SMF unit (208) and a plurality of nodes of the network (106), wherein the PDU accept message is attached within the first SM container; caching, by the one or more processors (302), the first SM container subsequent to attaching the PDU accept message within the first SM container; generating, by the one or more processors (302), a resource setup request message to be transmitted to the RAN unit (204) from the SMF unit (208) via the AMF unit (206), wherein the message includes the first SM container and a second SM container as received from the SMF unit (208); and transmitting, by the one or more processors (302), a resource setup response message and the cached first SM container which includes the PDU accept message from the RAN unit (204) to the SMF unit (208) via the AMF unit (206) and, from the AMF unit (206) to the UE unit (102) via the RAN unit (204), respectively, thereby establishing a PDU session in the network (106).
  13. 13. The method (500) as claimed in claim 12, wherein on receipt of the create SM request message at the SMF unit (208), the method comprises the step of establishing, by the one or more processors (302), the PDU session, and transmit an establishment response to the AMF unit (206).
  14. 14. The method (500) as claimed in claim 12, wherein each of the at least one UE (102) and the RAN unit (204) are coupled to each other via a first interface unit, wherein the first interface is at least one of a N 1 interface.
  15. 15. The method (500) as claimed in claim 12, wherein the PDU establishment request message received by the RAN unit (204) is an N 1 message type and the PDU establishment request message transmitted to the AMF unit (206) is a N2 message type.
  16. 16. The method (500) as claimed in claim 12, wherein the N2 message type is an uplink (UL) Non-Access Stratum (NAS) transport message which further includes at least one of a Network Slice Selection Assistance Information (NSSAI), the PDU session ID, and request type.
  17. 17. The method (500) as claimed in claim 12, wherein the plurality of nodes includes a Unified Data Management (UDM), a User Plane Function (UPF), a Policy Control Function (PCF), and a Charging Function (CHF).
  18. 18. The method (500) as claimed in claim 12, wherein the create SM request message includes at least a Subscriber Permanent Identifier (SUPI), Data Network Name (DNN), Single Network Slice Selection Assistance information (S-NSSAI), PDU Session ID, AMF ID, Request Type, Policy Control Function (PCF) ID, Priority Access, N1 SM container (PDU Session Establishment Request), User location information, Access Type, Permanent Equipment Identifier (PEI), Generic Public Subscription Identifier (GPSI), UE presence in EADN service area, Subscription For PDU Session Status Notification, and DNN Selection Model.
  19. 19. The method (500) as claimed in claim 12, wherein the PDU accept message includes at least the PDU Session ID, second SM information and N1SM container.
  20. 20. The method (500) as claimed in claim 12, wherein on receipt of the resource setup response message at the SMF unit (208) from the RAN unit (204), the PDU is marked as established in the AMF unit (206).

Description

METHOD AND SYSTEM FOR ESTABLISHING A PACKET DATA UNIT (PDU) SESSION IN A NETWORK FIELD OF THE INVENTION [0001] The present invention relates to the field of 5G core network and, more particularly, relates to a method and system for establishing a Packet Data Unit (PDU) session in the network. BACKGROUND OF THE INVENTION [0002] Mobile communication systems have traditionally focused on providing voice services. However, with the expansion of mobile communication systems to include data services, there has been a significant increase in traffic, leading to resource constraints. Users now require higher-speed services, necessitating the development of a more advanced mobile communication system. [0003] The requirements for a next-generation mobile communication system are driven by the need to support the explosive growth of data traffic, provide higher transmission rates per user, accommodate a significantly increased number of connection devices, achieve low end-to-end latency, and improve energy efficiency. These demands have led to the development of improved 5G communication systems. [0004] In a 5G communication system, a PDU Session Establishment Request is received from User Equipment (UE), which is processed through Radio Access Network (RAN), an Access and Mobility Management Function (AMF) and a Session Management Function (SMF) whenever any data session needs to be established by User Equipment. To cater to this request, Packet Data Unit (PDU) session are established and processed between UE and SMF using NAS Signaling message exchange between these two network nodes as per 3GPP standard TS 24.501 - related to PDU Session Establishment Procedure. This involves sending a Session management message from AMF to SMF, and configuring the SMF to process the PDU session establishment request, create a PDU Session Establishment Accept message and send the PDU Session Establishment Accept message to the UE through Ni l interface. These are NAS Signaling messages which are defined as per 3GPP TS 24.501 standard procedure. [0005] Sometimes this PDU Session Establishment Accept Message sent by SMF may not be received by UE due to network issues between RAN and UE or due to some other reasons. In this situation PDU Session Establishment Request message is retransmitted by User Equipment and a fresh create SM message must be sent to the SMF.SMF will need to recreate the exact same PDU Accept Message as it was done earlier but without going to any other nodes like PCF, UPF, UDM, CHF. This only leads to unnecessary traffic on the Ni l interface between the AMF and SMF. [0006] There is a need for an optimization solution that reduces the traffic on the Ni l interface and facilitates faster PDU session establishment transfers during retransmission more effectively and efficiently. SUMMARY OF THE INVENTION [0007] One or more embodiments of the present disclosure provide a method and system for establishing a Packet Data Unit (PDU) session establishment in a network. [0008] In one aspect of the present invention, the system for establishing the PDU session establishment in the network is disclosed. The system includes a transceiver configured to transmit a PDU establishment request message to a Radio Access Network (RAN) unit from an at least one User Equipment (UE). The transceiver is further configured to transmit the PDU establishment request message from the RAN unit to an Access and Mobility Management Function (AMF) unit. The transmitted PDU establishment request message includes a first Session Management (SM) container having the PDU establishment request message attached therein. The transceiver is further configured to transmit a create SM request message to a Session Management Function (SMF) unit utilizing at least one communication protocol, based on receipt of the first SM container at the AMF unit. [0009] Further, the system includes a generation unit configured to generate a PDU accept message based on successful interaction between the SMF unit and a plurality of nodes of the network. The PDU accept message is attached within the first SM container. Further, the system includes a caching unit configured to cache the first SM container subsequent to attaching the PDU accept message within the first SM container. Further, the system includes a setup message generation unit configured to generate a resource setup request message to be transmitted to the RAN unit from the SMF unit via the AMF unit. The resource setup request message includes the first SM container and a second SM container as received from the SMF unit. Further, the system includes a transmittal unit configured to transmit a resource setup response message and the cached first SM container which includes the PDU accept message from the RAN unit to the SMF unit via AMF unit and, from the AMF unit to the UE unit via RAN unit, respectively, thereby establish a PDU session in the network. [0010] In an embodiment, on receipt of the create S