A packet data serving node (PDSN) may manage sessions between mobile devices and a packet-based network. The PDSN may send requests to and receive responses from an authentication, authorization, and accounting (AAA) server. The PDSN may include a packet session manager configured to create, maintain, and terminate the sessions between the mobile devices and the packet-based network. The PDSN may include a global AAA manager. The global AAA manager may be configured to determine a latency in communication between the PDSN and the AAA server based on latencies in responses from the AAA server to at least two requests which the PDSN sends to the AAA server. The global AAA manager may be configured to determine an adjustment in a load which may be imposed on the AAA sever based on the determined latency and to cause the determined adjustment in the load which may be imposed on the AAA server to be implemented.