Browsing by Author "Yen, Frank C. M."

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A Novel Adaptive P-Persistent MAC Scheme for WLAN Providing Low Delay Variance
(2006)
Chang, Chung-Ju
;
Yen, Frank C. M.
;
Chen, Yih-Shen
;
Huang, ChingYao
;
電信工程研究所
The paper proposes and analyzes a novel adaptive p-persistent-based (APP) medium access control (MAC) scheme to provide low delay variance for IEEE 802.11 WLAN. The APP MAC scheme can differentiate permission probabilities of transmission for stations being incurred with different packet delays, and the permission probability is designed as a function of the numbers of retransmissions and re-backoffs so that stations being with larger packet delay can attain higher permission probability. Additionally, the scheme is modeled by a Markov-chain and successfully analyzed, where the system throughput and delay are derived. Results show that the proposed APP MAC scheme can achieve lower delay variance than conventional algorithms; it can effectively reduce the collision probability and the mean delay, therefore, the mean throughput is enhanced, as well.
An effective APP MAC scheme for multimedia WLAN-based DSRC networks
(2006)
Chang, Chung-Ju
;
Yen, Frank C. M.
;
Chen, Yih-Shen
;
電信工程研究所
;
Institute of Communications Engineering
The paper proposes an effective adaptive p-persistent-based (APP) medium access control (MAC) scheme for WLAN-based dedicated short-range communications (DSRC) networks supporting multimedia services. The APP MAC scheme adaptively gives differentiated permission probabilities to on board units (OBUs) which are in different access category and with various waiting delay. Simulation results show that the APP MAC scheme can improve the performance of multimedia WLAN-based DSRC networks, such as small real-time packet dropping probability, low delay variation, and high system throughput, compared to conventional MAC algorithms.