Difference between 1-Persistent and p-Persistent CSMA Last Updated : 13 Jul, 2020 Comments Improve Suggest changes Like Article Like Report Prerequisite – Carrier Sense Multiple Access (CSMA) 1. 1-persistent CSMA : In 1-persistent CSMA, station continuously senses channel to check its state i.e. idle or busy so that it can transfer data. In case when channel is busy, station will wait for channel to become idle. When station finds an idle channel, it transmits frame to channel without any delay with probability 1. Due to probability 1, it is called 1-persistent CSMA. The problem with this method is that there is a huge chance of collision, as two or more stations can find channel in idle state and transmit frames at the same time. At the time when a collision occurs station has to wait for random time for channel to be idle and to start all again. Figure - 1-persistent CSMA 2. p-persistent CSMA : p-persistent CSMA is used when a channel has time-slots and that time-slot duration is equal to or greater than maximum propagation delay time for that channel. When station is ready to send frames, it will sense channel. If channel found to be busy, station will wait for next time-slot. But if channel is found to be idle, station transmits frame immediately with a probability p. The station thus waits for left probability i.e. q which is equal to 1-p, for beginning of next time-slot. If the next time-slot is also found idle, station transmits or waits again with probabilities p and q. This process repeats until either frame gets transmitted or another station starts transmitting. Figure - p-persistent CSMA Difference between 1-persistent and p-persistent CSMA : Basis 1-persistent CSMA p-persistent CSMA Carrier Sense When channel is idle it will send with probability 1. When channel is idle it will send with probability p. Waiting It will continuously sense channel for transmission of frames. It will wait for next time slot for transmission of frames. Chance of Collision In this method, there are highest number of collisions observed. In this method, there are less chances of collision than in 1-persistent. Utilization It's utilization is above ALOHA because frames are sent only when channel is found in idle state. It's utilization is dependent on probability p. Delay low load It is small because frames are sent only in idle state. It is large when probability p is small because station will not send always in idle state of channel. Delay high load It is high due to collision. It is large when probability p of sending is small when channel is found in idle state. Comment More infoAdvertise with us Next Article Difference between 1-Persistent and p-Persistent CSMA I itskawal2000 Follow Improve Article Tags : Computer Networks Difference Between GATE CS Similar Reads Difference between 1-Persistent and Non-Persistent CSMA Carrier Sense Multiple Access (CSMA) is a type of network protocol used in the organization of access to networks including Ethernet. Non-Persistent CSMA and 1-Persistent CSMA are two variations of CSMA that are often employed. The knowledge of the relative distinction between these two protocols is 5 min read Difference Between Non-Persistent and p-Persistent CSMA Carrier Sense Multiple Access (CSMA) is a network protocol that determines on how data should be transmitted in a shared medium communication channel so that there will be no collisions. It provides for the possibility for several equipment or devices to send out data while at the same time not clas 6 min read Difference between 1-persistent, p-persistent and Non-persistent CSMA Carrier Sense Multiple Access (CSMA) is a network protocol used to control access to a shared communication channel. Before a device (or station) sends data, it first listens to the channel (also called carrier sensing) to check if it is busy or idle. If the channel is idle, the device starts transm 5 min read Difference between CDMA and GPRS Computer network is a set of associated computers. Computers in an organization are called hubs. The association between PCs should be possible by means of cabling, most normally the Ethernet link, or fibre optic link. Associations can likewise be remote; you'll hear the term wi-fi to portray data s 3 min read Difference between LTE and CDMA LTE (Long-Term Evolution) and CDMA (Code Division Multiple Access) are both technologies used in mobile communications but they serve different purposes and are based on different principles.LTE is a more recent 4G mobile communication standard that offers significantly higher data speeds, lower lat 5 min read Like