Loading...

Modeling of Interference Control in Wireless Ad-Hoc Networks in the Base of Transmission Rate Control in TCP

Naseri Samaghcheh, Zeynab | 2008

830 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39113 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Haeri, Mohammad
  7. Abstract:
  8. An Ad-Hoc wireless network consists of a collection of geographically distributed nodes that communicate with each other over a wireless medium. These networks don’t use any infrastructure or base station to channel allocation. The important difference between wireless networks and wired networks is the broadcast nature of wireless communications. In these networks, each node transmits data to all of the nodes in the transmission range which may cause an increase in interference and data loss. On the other hand, due to mobility of users, fading the channel between them and change of routing, the probability of data loss increases. The extensive and successful employment of TCP variants in wired networks has implied a great tendency for utilizing some TCP-based methods in wireless networks. Based on this fact, some TCP variants have been proposed during the last few years to enhance the TCP performance on wireless networks. In this thesis, due to the problems in interaction between TCP and IEEE 802.11 MAC in Ad-Hoc networks, the control transmission rate in TCP has been extended to wireless Ad-Hoc networks. For this reason, the interference range is assumed to be a factor proportional to the distance between transmitter and receiver. Also, an appropriate factor for computing the value of interference in each region of this range is presented. The local stability of the system in the presence of constant and variable delay using the Lyapunov and Lyapunov-Krasovskii functions has been proved and the upper bound of the constant and variable delays has been computed with Nyquist criteria and LMI method. Simulation results illustrate the performance of extended model with some common cost functions in wired networks considering the mobility of the users, variant link capacities and different initial states of different sources. Also, the maximum radious of the range of mobility has been calculated. Finaly the upper bound of the constant and variable delays has been validated
  9. Keywords:
  10. Wireless Networks ; Interference ; Transmission Control Protocol (TCP) ; Linear Matrix Inequality (LMI) ; Mobility ; Wireless Ad-hoc Network ; Interference Range ; Time Variable Delay

 Digital Object List

  • محتواي پايان نامه
  •   view

 Bookmark

No TOC