QoS Application Method in Portable Internet

Four methods of mobile IP (MIP) registration; call admission control (CAC), L2/L3 mobility and DiffServ mapping are mentioned for QoS assurance in portable Internet networks. At operator´s first implementation stage, QoS assurance method of only L2 mobility is applied with QoS parameter of CAC and scheduling function of its CAC. The CAC is applied differently according to class of service, and CAC factors are maximum/minimum bandwidth and traffic priority. At operator´s second implementation stage, QoS assurance method of L2 and L3 mobility is applied with QoS parameter of CAC and scheduling function of its CAC. Here, CAC factors are maximum/minimum bandwidth, traffic priority, maximum delay and tolerated jitter. Finally, at the third implementation stage of operators, QoS assurance for nrtPS and rtPS rtPS service class are almost same as second implementation stage, but operator will strength QoS manager functions compare to previous stage for more accurate QoS assurance