Abstract
Under the background of intelligent transportation application, QoS for various services is different in wireless com-munication. Based on the MAC layer protocol, this paper analyzes the QoS in IEEE 802.11 MAC protocol framework, and proposes a new design of a Differentiation Enhanced Adaptive EDCA (enhanced distribution channel access) approach. The proposed approach adjusts the window zooming dynamically according to the collision rate in sending data frames, makes random offset, and further distinguishes the competition parameters of the data frames that have the same priority, so as to reduce the conflict among the data frames, and improve the channel utilization. Experiments with different service cases were conducted. The simulation results show that: comparing with the conventional EDCA method, the proposed approach can ensure that high priority services are sent with priority, and the overall QoS is highly improved.
Highlights
In the intelligent transportation systems (ITS), there are two wireless communication modes: car to car and car to road
The progressively increasing multiples of their competition window are smaller. This algorithm still strictly ensure the priority relations among all categories of data, it is critical for the application of intelligent transportation system, because it must ensure that high-priority data to send first
Though the introduction of the offset, we decline the probability of the same access category (AC) data frame choosing the same competition parameter and reduce the collision rate between them, which is in favor of improving the performance of the whole network
Summary
In the intelligent transportation systems (ITS), there are two wireless communication modes: car to car and car to road They are the foundation of providing information exchange and service. In different intelligent transportation application scenarios, each service has stringent requirements for QoS of wireless communications. MAC layer is the focus of communication protocol in intelligent transportation application. CarTalk 2000 Project proposed the mechanism of Ad Hoc MAC [4] It adopts dynamic TDMA mechanism, and each service accesses to the channel by making an appointment. For network throughput and delay, this paper lays special stress on analyzing the MAC layer, and emphatically studies the performance of QoS of EDCA mechanism in intelligent transportation and designs a new mechanism to improve it.
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