Abstract
To improve the efficiency of carrier sense multiple access (CSMA)-based medium access control (MAC) protocol, CSMA with collision resolution (CSMA/CR) has been proposed. In the CSMA/CR protocol, a transmitting station can detect a collision by employing additional carrier sensing after the start of data transmission and resolve the next collision that might occur by broadcasting a jam signal during a collision detection (CD) period. By extending this original CSMA/CR protocol that uses a single CD phase, in this paper we propose a multi-phased CSMA/CR (MP-CSMA/CR) protocol that employs multiple CD phases. In the proposed MP-CSMA/CR protocol, colliding stations are filtered in each CD phase, and only surviving stations compete again in the next CD phase. Therefore, the collision resolution probability becomes higher as the CD phases proceed. Results show that the proposed MP-CSMA/CR protocol significantly outperforms the conventional CSMA/CR with a single CD phase.
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Notes
- 1.
In this case, the station that selects the later CD slot (i.e., Station 3) detects the overlapped jam signal. Because an overlapped signal with the same pattern is generally detectable [9], Station 3 can recognize the jam signal and stop its transmission.
- 2.
The comparison results of CSMA/CR with the other CSMA-based MAC protocols (i.e., CSMA/CA and WCSMA/CD) can be found in [7].
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Acknowledgment
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0025424).
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Choi, HH., Lee, JR. (2017). Multi-phased Carrier Sense Multiple Access with Collision Resolution. In: Lee, JH., Pack, S. (eds) Quality, Reliability, Security and Robustness in Heterogeneous Networks. QShine 2016. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 199. Springer, Cham. https://doi.org/10.1007/978-3-319-60717-7_22
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