scheduling

Scheduling, in the context of communications, refers to a method used in broadcast networks to manage channel access. Instead of all nodes transmitting simultaneously, scheduling ensures that nodes take turns transmitting in an orderly fashion. This prevents collisions and allows for efficient data transfer.1

One common scheduling technique is time-division multiple access (TDMA), where each node is assigned a specific time slot to transmit. If a node doesn't need to transmit, its slot goes unused. To improve efficiency, a reservation system can be implemented, allowing nodes to reserve slots only when needed. Another method is polling, where a central controller or a special "token" packet grants permission to transmit. These scheduled access methods contrast with random access, where nodes attempt to transmit when they have data, risking collisions but potentially offering quicker access.1