Method for mobile communication system, mobile communication system, mobile terminal, network node, and pgw

Abstract

A communication system according to an exemplary embodiment of the invention includes an MME ( 25 ) that, by movement of a UE ( 45 ), performs Tracking Area Update processing that changes a location registration area of the UE ( 45 ) and manages the location registration area of the UE ( 45 ) before change, and a PGW ( 75 ) that sends, to the MME ( 25 ), a control signal required to be notified to the UE ( 45 ) during execution of the Tracking Area Update processing. When the MME ( 25 ) receives the control signal, it sends a response signal indicating that the Tracking Area Update processing is being executed to the PGW ( 75 ), and, after completion of the Tracking Area Update processing, the PGW ( 75 ) sends the control signal to an MME ( 35 ) that manages the location registration area of the UE ( 45 ) after change.

1 .- 20 . (canceled) 
     
     
         21 . A mobility management apparatus comprising:
 a receiver configured to receive a message; and   a processor configured to activate a user plane setup procedure,   wherein the receiver receives a TAU (Tracking Area Update) request message from a UE (User Equipment) via a base station in a TAU procedure, and   wherein in case the receiver receives a DDN (Downlink Data Notification) message while the UE is connected in the TAU procedure, the processor activates the user plane setup procedure even if an active flag is not set in the TAU request message.   
     
     
         22 . The mobility management apparatus according to  claim 21 , wherein
 the receiver receives the DDN message from an SGW (Serving Gateway) that received packets or a control signal for the UE.   
     
     
         23 . The mobility management apparatus according to  claim 21 , wherein
 the user plane setup procedure is activated in conjunction with the TAU procedure.   
     
     
         24 . The mobility management apparatus according to  claim 21 , wherein
 the mobility management apparatus is an MME (mobility management entity).   
     
     
         25 . A method for a mobility management apparatus, the method comprising:
 receiving a TAU (Tracking Area Update) request message from a UE (User Equipment) via a base station in a TAU procedure; and   activating a user plane setup procedure even if an active flag is not set in the TAU request message, in case of receiving a DDN (Downlink Data Notification) message while the UE is connected in the TAU procedure.   
     
     
         26 . The method according to  claim 25 , wherein
 the mobility management apparatus receives the DDN message from an SGW (Serving Gateway) that received packets or a control signal for the UE.   
     
     
         27 . The method according to  claim 25 , wherein
 the user plane setup procedure is activated in conjunction with the TAU procedure.   
     
     
         28 . The method according to  claim 25 , wherein
 the mobility management apparatus is an MME (mobility management entity).