Modelling, simulation and performance evaluation of the IEEE 802.11e protocol with station mobility.

Area of Science:

• Computer Science
• Electrical Engineering
• Wireless Communications

Background:

• The IEEE 802.11e protocol enhances Quality of Service (QoS) in wireless local area networks.
• Colored Petri Nets (CPNs) offer a flexible graphical modeling approach for concurrent systems.

Purpose of the Study:

• To develop a parameterized CPN model for the IEEE 802.11e protocol.
• To analyze the impact of mobile station mobility and proximity on network performance.
• To evaluate the effectiveness of collision avoidance mechanisms like RTS/CTS.

Main Methods:

• A parameterized Colored Petri Net (CPN) model was developed to represent the IEEE 802.11e protocol.
• The model incorporates parameters for traffic types, user mobility, and collision avoidance.
• Simulations were conducted by varying station proximity and analyzing network performance metrics.

Main Results:

• Network performance is significantly affected by the proximity of mobile stations.
• The RTS/CTS protocol plays a crucial role in collision avoidance, especially in scenarios with dispersed users.
• Performance improvements were observed when stations moved into the same communication range.

Conclusions:

• Parameterized CPNs provide a flexible tool for modeling and analyzing wireless protocols like IEEE 802.11e.
• Station mobility and spatial distribution critically influence wireless network performance and the efficacy of collision avoidance strategies.
• The findings highlight the importance of network topology and protocol parameters in optimizing wireless communication systems.