Effect of the contention window size on performance and fairness of the IEEE 802.11 standard

2007 ◽  
Vol 43 (4) ◽  
pp. 1267-1278 ◽  
Author(s):  
Azade Khalaj ◽  
Nasser Yazdani ◽  
Maseud Rahgozar
Keyword(s):  
Ieee 802.11 ◽  
Window Size ◽  
Contention Window ◽  
Contention Window Size ◽  
Ieee 802.11 Standard

scholarly journals Dynamic Duty-Cycle MAC Protocol for IoT Environments and Wireless Sensor Networks

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4069 ◽  
Author(s):  
Gayoung Kim ◽  
Jin-Gu Kang ◽  
Minjoong Rim
Keyword(s):  
Energy Consumption ◽  
Duty Cycle ◽  
Traffic Congestion ◽  
Mac Protocol ◽  
Window Size ◽  
Transmission Delay ◽  
Contention Window ◽  
Peak Time ◽  
Contention Window Size ◽  
The Internet Of Things

This paper proposes a new protocol that can be used to reduce transmission delay and energy consumption effectively. This will be done by adjusting the duty-cycle (DC) ratio of the receiver node and the contention window size of the sender node according to the traffic congestion for various devices in the Internet of Things (IoT). In the conventional duty-cycle MAC protocol, the data transmission delay latency and unnecessary energy consumption are caused by a high collision rate. This is because the receiver node cannot sufficiently process the data of the transmitting node during the traffic peak time when the transmission and reception have the same duty-cycle ratio. To solve this problem, this paper proposes an algorithm that changes the duty-cycle ratio of the receiver and broadcasts the contention window size of the senders through Early Acknowledgment (E-ACK) at peak time and off/peak time. The proposed algorithm, according to peak and off/peak time, can transmit data with fewer delays and minimizes energy consumption.

Several Contention Window Adjustment Techniques for Improving Unsaturated throughput of Wireless LANs

2014 ◽  
Vol 931-932 ◽  
pp. 952-956
Author(s):  
Jesada Sartthong ◽  
Suvepon Sittichivapak ◽  
Nitthita Chirdchoo
Keyword(s):  
Load Condition ◽  
Window Size ◽  
Traffic Load ◽  
Contention Window ◽  
Area Network ◽  
Chain Model ◽  
Function Concept ◽  
Contention Window Size ◽  
Comparison Results ◽  
Size Adjustment

This paper proposes the several contention window adjustment schemes in backoff process as well-known backoff algorithm (BA) for improving the performance of wireless local area network (WLAN). In addition, this research introduces a new unsaturated discrete Markov chain model in fixed backoff stages and fixed contention window sizes technique (FBFC). The proposed contention window adjustment schemes are designed by applying the moment generating function concept in random variable and process theorem. Unsaturated throughput parameters are used to compare the performance of all contention window size adjustment techniques based on IEEE802.11b WLAN standards. The comparison results show that Bernoulli and Double adjustment schemes are good contention window size adjustments at light traffic load, and the Even contention window size adjustment operates well at high traffic load condition.

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