Ha Cheol Lee

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Over the past few years, mobile networks have emerged as a promising approach for future mobile IP applications. With limited frequency resources, designing an effective MAC (Medium Access Control) protocol is a hot challenge. IEEE 802.11b/g/a/n networks are currently the most popular wireless LAN products on the market [1]. The conventional IEEE 802.11b(More)
This paper explores the throughput performance of CSMA/CA (carrier sense multiple access/collision avoidance)-based DCF (distributed coordination function) protocol over frequency-selective, slow Ricean fading channels at the MAC layer in the 802.11a wireless LAN. By analyzing the DCF throughput with the mandatory data rate of 6 Mbps, 12 Mbps, 24 Mbps and(More)
This paper explores a MAC (Medium Access Control) layer throughput with DCF (Distributed Coordination Function) protocol in the IEEE 802.11a/g/n-based mobile LAN. It is evaluated in Rayleigh fading wireless channel, using theoretical analysis method. The DCF throughput performance is analyzed by using the number of stations with both variable payload size(More)
  • Ha Cheol Lee
  • 2010 Third International Conference on Advances…
  • 2010
This paper analyzes the effect of RTS (Request To Send) and CTS (Clear To Send) frames on the network performance in the ad hoc-based mobile LAN. An ad hoc-based mobile LAN with two clients and one server is simulated using OPNET simulator to analyze network load, connection congestion window size and traffic received from each client in the FTP server. We(More)
  • Ha Cheol Lee
  • Proceedings of the 2011 International Conference…
  • 2011
This paper explores a MAC (Medium Access Control) layer throughput with DCF (Distributed Coordination Function) protocol in the IEEE 802.11a/g/n-based mobile LAN. It is evaluated in Rayleigh fading wireless channel, using theoretical analysis method. The DCF throughput performance is analyzed by using the number of stations with both variable payload size(More)
This paper provides optimum packet size that maximize the throughput efficiency of TCP/IP traffic as a function of data packet length for several values of channel BER over wireless ATM links applying data link error control schemes to reduce error problems encountered in using wireless links. For TCP/IP nondelay-sensitive traffic requiring reliable(More)
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