Method for user plane connection activation or deactivation per session

Abstract

This disclosure provides a User Equipment (UE), including: a transmitter configured to transmit at least one Protocol Data Unit (PDU) session identifier (ID), each of which indicates a PDU session that the UE needs to use in a Non Access Stratum (NAS) Service Request message to a Mobility Management Function (MMF) via an access network (AN) node when the UE has user data to send.

1 . A method performed in a User Equipment (UE), the method comprising:
 sending, to a second core network node, a first request so that a User Plane resource is released; and   receiving a Radio Resource Configuration (RRC) message, wherein   the first request includes at least one session ID, and   the at least one session ID corresponds to a first core network node.   
     
     
         2 . The method according to  claim 1 , wherein the RRC message is received to release an access node resource. 
     
     
         3 . The method according to  claim 1 , wherein the User Plane resource is released by the first core network node. 
     
     
         4 . The method according to  claim 1 , wherein the first core network node is a session management function (SMF). 
     
     
         5 . The method according to  claim 1 , wherein the second core network node is a mobility management node. 
     
     
         6 . A method performed in a second core network node, the method comprising:
 receiving, from a User Equipment (UE), a first request so that a User Plane resource is released; and   sending, to a first core network node, the first request; wherein   the first request includes at least one session ID, and   the at least one session ID corresponds to the first core network node.   
     
     
         7 . The method according to  claim 6 , further comprising:
 receiving, from the first core network node, a protocol data unit (PDU) session release command; and   sending, to an access node, information including the PDU session release command.   
     
     
         8 . The method according to  claim 6 , wherein the User Plane resource is released by the first core network node. 
     
     
         9 . The method according to  claim 6 , wherein the first core network node is a session management function (SMF). 
     
     
         10 . The method according to  claim 6 , wherein the second core network node is a mobility management node. 
     
     
         11 . A method performed in a first core network node, the method comprising:
 receiving, from a second core network node, a first request; and   releasing a User Plane resource after receiving the first request; wherein   the first request includes at least one session ID, and   the at least one session ID corresponds to the first core network node.   
     
     
         12 . The method according to  claim 11 , further comprising:
 sending, to the second core network node, a protocol data unit (PDU) session release command.   
     
     
         13 . The method according to  claim 11 , wherein the first core network node is a session management function (SMF). 
     
     
         14 . The method according to  claim 11 , wherein the second core network node is a mobility management node. 
     
     
         15 . A User Equipment (UE) comprising:
 a memory having stored therein program instructions; and   at least one processor that when executing the program instructions is configured to:   send, to a second core network node, a first request so that a User Plane resource is released and   receive a Radio Resource Configuration (RRC) message, wherein the first request includes at least one session ID, wherein the at least one session ID corresponds to a first core network node.   
     
     
         16 . The user equipment (UE) according to  claim 15 , wherein the RRC message is received to release an access node resource. 
     
     
         17 . The user equipment (UE) according to  claim 15 , wherein the User Plane resource is released by the first core network node. 
     
     
         18 . The user equipment (UE) according to  claim 15 , wherein the first core network node is a session management function (SMF). 
     
     
         19 . The user equipment (UE) according to  claim 15 , wherein the second core network node is a mobility management node. 
     
     
         20 . A second core network node comprising:
 a memory having stored therein program instructions; and   at least one processor that when executing the program instructions is configured to:   receive, from a User Equipment (UE), a first request so that a User Plane resource is released; and   send, to a first core network node, the first request; wherein   the first request includes at least one session ID, and   the at least one session ID corresponds to the first core network node.   
     
     
         21 . The second core network node according to  claim 20 , wherein the at least one processor is further configured to execute the program instructions to receive, from the first core network node, a protocol data unit (PDU) session release command, and
 send, to an access node, information including the PDU session release command.   
     
     
         22 . The second core network node according to  claim 20 , wherein the User Plane resource is released by the first core network node. 
     
     
         23 . The second core network node according to  claim 20 , where in the first core network node is a session management function (SMF). 
     
     
         24 . The second core network node according to  claim 20 , wherein the second core network node is a mobility management node. 
     
     
         25 . A first core network node comprising:
 a memory having stored therein program instructions; and   at least one processor that when executing the program instructions is configured to:   receive, from a second core network node, a first request; and   release a User Plane resource after receiving the first request; wherein   the first request includes at least one session ID, and   the at least one session ID corresponds to the first core network node.   
     
     
         26 . The first core network node according to  claim 25 , wherein the at least one processor is further configured to execute the program instructions to send, to the second core network node, a protocol data unit (PDU) session release command. 
     
     
         27 . The first core network node according to  claim 25 , wherein the first core network node is a session management function (SMF). 
     
     
         28 . The first core network node according to  claim 25 , wherein the second core network node is a mobility management node.