The invention discloses a core network load balancing method, base stations, base station pools and a core network. Direct communication connection is provided for user terminals through the base stations in the base station pools. The core network load balancing method includes the steps: after a base station receives a connection establishing request message sent from a user terminal of a calling party, by means of the base station pool that the base station owns, the information of the base station pool that the base station owns and the tracking area information are sent to a base station or a base station pool owned by a user terminal of a called party. For the core network load balancing method, the related base stations in the wireless communication network are organized as a base station pool; calling of the user terminals is realized through the base station pool; and connection between the user terminals of the calling and called parties is established, so that communication between the user terminals of the calling and called parties is realized. Besides, the structure of the base station pool supports switching of the user terminals between the base station pools, so that mobility of the user terminals is guaranteed.