Wireless Network evolution Current(Separated Voice/Data) Future(Integrated Voice/Data PSTN Internet PSTN Internet Router MGW Softswitch Circuit Packet Router (ATM/P) Single Network PDSN MGW MSC PDSN WLAN AP WLAN AP BSS IP- BSS Voice path Packet Data Path MGW: Media Gateway, PDSN: Packet Data Service Node, AP: Access PointWireless Wireless Network Evolution Network Evolution WLAN AP IP-BSS Softswitch Single Network (All IP) PSTN Internet MGW Router Voice Path Packet Data Path PDSN MGW Core Core Access Access MSC Packet (ATM/IP) BSS WLAN AP PDSN Circuit PSTN Internet * MGW : Media Gateway, PDSN : Packet Data Service Node, AP : Access Point Router Current (Separated Voice/Data) Current (Separated Voice/Data) Future (Integrated Voice/Data) Future (Integrated Voice/Data)