IEEE 802.11 무선랜의 성능 향상을 위한 하이브리드 MAC 프로토콜

다국어 초록 (Multilingual Abstract)

The DCF (Dcistributed Coordination Function) and PCF (Point Coordination Function) are the basic MAC (Medium Access Control) protocols of IEEE 802.11 wireless LANs. According to the DCF, each node performs the exponential backoff algorithm before the transmission of its data frame. Each node doubles the backoff waiting time before the transmission of its data frame whenever it detects the transmission collision with other nodes. Therefore, as the number of the active nodes having the data frames to transmit increases, the overall MAC performance of the DCF decreases. On the other hand, according to the PCF, each node is granted the transmission opportunity by which the PCF transmission is possible without the collision with other nodes. Therefore, as the number of the active nodes increases, the MAC performance of the PCF increases, In this paper, considering the tradeoff of MAC performance between the DCF and PCF, a hybrid MAC protocol is proposed to enhance the performance of IEEE 802.11 wireless LANs.

참고문헌 (Reference)

1 최우용, "무선랜에서 망 상태에 따른 DCF와 PCF 프로토콜의 선택적인 사용을 통한 MAC 성능 향상" 대한산업공학회 37 (37): 89-95, 2011

2 최우용, "Optimal Frame Aggregation Level for Connectivity-Based Multipolling Protocol in IEEE 802.11 Wireless LANs" 대한산업공학회 40 (40): 520-525, 2014

3 Young, A, "Method and System for Improving Throughput over Wireless Local Area Networks with Mode Switching, United States Patent, Patent No. 6990116"

4 "IEEE Std 802.11n, Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications : Enhancements for Higher Throughput"

5 "IEEE Std 802.11e, Wireless LAN Medium Access Control (MAC)and Physical Layer Specifications : Medium Access Control (MAC)Quality of Service (QoS) Enhancements" 2005

6 "IEEE Std 802.11 , Wireless LAN Medium Access Control (MAC)and Physical Layer (PHY) Specifications"

7 Goliya, A., "Dynamic Adaptation of DCF and PCF Mode of IEEE 802.11 WLAN" Indian Institute of Technology 2003

8 Siwamogsatham, S., "A Hybrid Coordination Function Scheme for WLANs" 1 (1): 33-45, 2008