Synchronization and Fairness

Medium access control in ad hoc network environments employing Time Division Multiple Access (TDMA) mechanisms introduces specific challenges like fairness and synchronization.

Illustration of the synchronization mechanism within a synchronization period (st), among nodes r, u and v connected in a chain topology. Nodes wait for a certain amount of time (i.e., t , t_dr, t_du and t_dv, respectively) before transmitting the time remaining until the first time slot (i.e., t_0, t_1 and t_2, respectively) The internal clocks c_u, c_v along with the transmission time t_tx are also depicted.

Throughput as a function of the transmission probability for three different MAC policies.

Jain’s index as a function of transmission probability for the same MAC policies.


[3] Georgios Tsoumanis, Asterios Papamichail, Vasileios Dragonas, George Koufoudakis, Constantinos T Angelis, Konstantinos Oikonomou, “Implementation of a Topology Independent MAC (TiMAC) Policy on a Low-Cost IoT System”, In Future Internet, Multidisciplinary Digital Publishing Institute, vol. 12, no. 5, pp. 86, 2020.
[2] Vasileios Dragonas, Georgios Tsoumanis, George Koufoudakis, Asterios Papamichail, Konstantinos Oikonomou, Ioannis Stavrakakis, “A Fairness-Aware topology independent TDMA MAC policy in time constrained wireless ad hoc networks”, In Computer Networks, vol. 171, pp. 107157, 2020.
[pdf] [doi]
[1] Asterios Papamichail, Vasileios Dragonas, George Koufoudakis, Konstantinos Oikonomou, Georgios Tsoumanis, Ioannis Stavrakakis, “Low-cost Device Implementation of a Topology Independent MAC (TiMAC) Policy”, In Third International Balkan Conference on Communications and Networking 2019 (BalkanCom’19), Skopje, North Macedonia, 2019. ([pdf])