Resource reservation and admission control in IEEE 802.11 WLANs

Abstract

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.

Context Aware Mobile Initiated Handoff for Performance Improvement in IEEE 802.11 Networks

“…It does not cater for the dynamic changes in the load pattern. In [15], [16], [17] and [18] the decision is taken centrally and MNs are directed to move all at once. In [19] the decision is solely based on MN.…”

Wireless Self-Organizing Backbone Mesh Network (WiSoNet)

“…The end-to-end QoS in this case can be applied on MAC or IP-layer, as proposed in a previous study [5]. The access points (AP) and STAs must be provided with the required components to negotiate the required resources.…”

“…Moreover, the use of QoS-oriented load balancing mechanism [4] also enhances the QoS in the entire WiSoNet, especially in the access network. The combination of this structure and IEEE 802.11e on all APs and STAs should increase the provided QoS drastically [5]. However, the performance of these mechanisms is strongly dependent on the resource management on the related DS, i.e., QoS on the mesh backbone network.…”

“…The selected routing protocols as well as the route balancing mechanisms are in the case essential for enabling a kind of controlled QoS. The QoS-mechanisms proposed in [5] enables a kind of resource reservation and admission control in the mesh WLAN network. The use of IEEE 802.11e should increase the provided QoS especially for real-time traffic, such VoIP traffic.…”

QoS-Oriented Load Balancing for WLANs

“…Similarly, the load conductivity y(u, t) of a vertex u is expressed as the load that u can still receive without being overloaded, as presented in (17). Based on that, the load conductivity y(c-*>c2, t) of the path from vertex cl to vertex c2 expresses the load that can be shifted along this path from cl to c2; the smallest conductivity under edges and vertices along this path determines its maximal conductivity.…”