Question

in WSN

What is  synchronizer in S-MAC and FOLLOWER and Border Node?

Answer 1

SYNCHRONIZER----

A random timer is started by each node after all the nodes being used or deployed.while timer is running nodes listens to find a neighbor , and the node whose timer expires first will be called as synchronizer , and it will be the first node to eject  the sync packet . A sync packet contains the information about node that it will go to  sleep in t seconds , and all neighbor present n this synchronize's range will also accept adjust there timers to sleep in t seconds .

schedule -

each node know in advance that how long it sleeps before waking up , hence a schedule is regarded to know the sleep and listen phases of a node .

FOLLOWER--

A node which adjust its schedule according to its synchronizer and will not affect its timer according to any other synchronizer in future is called follower.

BORDER NODE ---

those nodes which have synchronized there neighbor to same time schedule then at there intersection where both waves of synchronisation meets there are some border nodes present about all the  schedulers .

the use of border nodes is to enables the inter cluster communication , and the will be the only nodes to carry one data packet from one cluster to another , border nodes adopt both schedules .