The ER3000 Gateway (SGW,PGW/AGW) is an access gateway platform accommodating LTE and UMB base stations. It incorporates the processor cluster architecture to share and to balance loads according to the magnitude of traffic and requires a small operation cost when the traffic is low in the initial period following introduction. This access gateway platform offers cost-effective scalability for separate and optimum expansion of the main signal system and other signal systems. The ER3000 Gateway (SGW,PGW/AGW) complies with the QoS standard. In addition, it supports IPv4/v6 and Mobile-IPv4/v6 dual-stack modes to ensure compatibility with IPv6 when IP address depletion occurs.