เทคนิคการจองช่องสัญญาณสำหรับโพรโทคอลควบคุมการเข้าถึงตัวกลางในระบบสื่อสารไร้สาย กรณีที่มีผู้ใช้บริการไม่ปฏิบัติตามเงื่อนไข / ชโลธร ชนะสงค์ = Channel reservation techniques for media access control protocol under misbehaved users in wireless communication system / Chalotorn Chanasong
This thesis presents an analysis of a channel reservation system for media access control protocol in wireless communication system with two groups of users, i.e. general and misbehaved users. Five different misbehaving scenarios are investigated, namely Cascade Fixed Probability + 2 Group (CFP+2G), Cascade Fixed Probability + 2 Group + Multi-Token (CFP+2G+MT), Cascade Fixed Probability + 2 Group + Shift Reservation Time (CFP+2G+SRT), Uniform + Limited Access + 2 Group (UNI+LA+2G) and Uniform + 2 Group + Multi-Token (UNI+2G+MT). The objective is to evaluate the effect of some misbehaved users on the overall system performance measured in terms of the average number of successful users for overall users and each group. System performance has been evaluated through mathematical formulation and verified by computer simulations. Numerical results show that in most cases the probability of success in reservation clearly degrades if only one user do not follow the agreed rule, except for one specific system namely CFP+2G+SRT where overall system throughput can actually improve for certain system configurations. When more users misbehave the overall performance can become deteriorated rapidly