Schedulers based on internal architecture

Based on the internal architecture, the schedulers are classified into sorted –priority and frame-based schedulers. In sorted priority method, each and every packet is time stamped. The time-stamping is done in the following manner. A global variable is maintained and is updated regularly whenever a packet arrives or departs from a node. Time stamp is the function of the global variable. Packets are sorted and transmitted based on their time-stamps. In frame based approach, time is split into frames of fixed or variable length. Each session makes a reservation based on the maximum traffic it is allowed to transmit during a frame period. The reservation is made according to the session’s allocated rate