The Resource Reservation and Admission Control (RRAC) in WLAN networks is essential for real-time applications, especially VoIP over WLAN. In that respect, the RRAC mechanism must support the BSS and ESS scopes as well as different reservation types (per-flow, per-station, etc.). Therefore, we introduce the Traffic Source-based Priority Scheme (TSPS); TSPS enables the priority mapping with IntServ and IEEE 802.1D QoS schemes. To manage the WLAN resources according to the admission control, the channel capacity is mapped according to different types of traffic (management, applications, etc). Consequently, certain RRAC mechanisms and algorithms for BSS and ESS scopes are developed to deal with different architectures and reservation types. Based on that, we implement a system prototype, called Lobaq; the experimental results present the major functionalities of the system behavior under different conditions.
The deployment of efficient roadside networks is a necessity for ITS deployment. The main challenge for the roadside deployment is to find a satisfying or best distribution of RSUs on the roads network according to the given conditions in order to meet the requested requirements of the roads operator.
Additionally, various factors affect this process such as traffic, infrastructure and topological characteristics of the roads. This paper introduces an Overlap based Greedy Method (OGM) as a basis for RSUs placement and can be applied on urban and rural roads. This method in its current development mainly considers the RSU coverage radius and the overlap rate into the RSUs distribution process. Moreover, a wide range of influencing factors is considered through the prioritization of Sites of Interest (SoIs). The OGM method is developed within the recently started PRONET project and is integrated into its software platform.The tests conducted on selected roads environment in the city of Rostock (Germany) ensure: (1) decrease in number of chosen SoIs for placement compared to the original scanned number of SoIs, and (2) full (continuous) coverage cannot be guaranteed for a roads network using only the available junctions.
The Load Balancing (LB) is essential for improving the WLAN efficiency, especially for VoIP over WLAN. Although 802.11v forms an important step to standardize LB in WLAN, nevertheless the concept, algorithms, and system model of LB are still required. In that respect, this paper proposes a novel concept for LB according to the graph representation of WLAN environment. In relation with WLAN features, a load distribution graph is constructed as the basis of the presented LB concept and algorithms in local scope. Accordingly, a QoSoriented LB method and a system model are developed. Based on that, a system prototype, called Lobaq, is implemented according to the centralized architecture. The experimental results present the major functionalities of system behavior and provide an improvement of network balance in relation with the test scenario from lower than 37 % to more than 73 %. Moreover, these results confirm the LB according to the QoS requirements.
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