Mobile communication system, core network node selection method, and base station and mobile station used therefor

Abstract

A mobile communication system in which a plurality of base stations and a plurality of core network nodes are distributed in a plurality of areas, wherein a source base station or a mobile station in a handover procedure of the mobile station transmits information for selecting a core network node to a target base station.

What is claimed is: 
     
         1 . A core network node in a mobile communication system comprising a target base station, a source base station, and a mobile station, the core network node comprising:
 a unit which receives a first identifier from the target base station when the mobile station performs handover from the source base station to the target base station;   wherein the first identifier identifies the core network node to which the source base station is connected.   
     
     
         2 . The core network node according to  claim 1 , wherein the first identifier is included in a message related to Path Switch. 
     
     
         3 . A target base station in a mobile communication system comprising a source base station, a core network node, and a mobile station, the target base station comprising:
 a unit which transmits a first identifier to the core network node when the mobile station performs handover from the source base station to the target base station;   wherein the first identifier identifies the core network node to which the source base station is connected.   
     
     
         4 . The target base station according to  claim 3 , wherein the first identifier is included in a message related to Path Switch.