Abstract
The ultimate task of a communication system is the exchange of payload messages among a set of nodes via a physical medium. If the medium is shared among these nodes, methods controlling medium occupancy called medium access schemes are applied.
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Notes
- 1.
Even if a message type is assigned to a mode and a slot, this does not imply that in every such slot, a message of this type is to be sent. Especially sporadic messages are only sent from time to time. In particular, in some occurrences of slot s14, there may be no message to be sent.
- 2.
In a variant of IEEE 802.11, the point coordinator can also contend for medium access during the contention period. This extension is referred to as Hybrid Coordination Function (HCF).
- 3.
The risk of collisions is further reduced by exchanging an RTS-CTS sequence before the actual data transmission. Since we are focusing on medium access schemes, we will not discuss this further.
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Gotzhein, R. (2020). Medium Access Schemes. In: Real-time Communication Protocols for Multi-hop Ad-hoc Networks. Computer Communications and Networks. Springer, Cham. https://doi.org/10.1007/978-3-030-33319-5_5
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