“Taking Turns” MAC protocols

Polling:

• master node “invites” slave nodes to transmit in turn

• Request to Send, Clear to Send msgs

• concerns:

  • polling overhead
  • latency
  • single point of failure (master)

Token passing:

• control token passed from one node to next sequentially.

• token message

• concerns:
  • token overhead
  • latency
  • single point of failure (token)

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