The present invention provides a radio access network system, comprising:
a core network CN; a plurality of radio access gateways (RAGs) each
performing processing of all the L1/L2/L3 protocols in a radio interface
access layer; and a plurality of remote RF units (RRUs); wherein said
plurality of RAGs are connected with said CN via Iu interfaces and are
connected with each other via Iur or Iur+ interfaces, said plurality of
RAGs are connected with corresponding RRUs via Iua interfaces for
realizing the control of said plurality of RAGs over said corresponding
RRUs and digital radio signal transmission therebetween. In a specific
mode for carrying out the present invention, each of said RAGs is divided
into two independent network elements, i.e., a radio bearer server RBS
and a radio control server RCS. The above radio access network
architecture set forth in the present invention overcomes the problems
existing in the original UTRAN architecture, solves the frequent mobility
management problem, and supports an architecture which has a clear
configuration and an explicit function division and in which the user
plane and the control plane of an RAN are separated.