Admission control with load balancing in IEEE 802.11-based ESS mesh networks

Abstract

In this paper we study connection admission control (CAC) in IEEE 802.11-based ESS mesh networks. An analytical model is developed for studying the effects of CAC on mesh network capacity. A distributed CAC scheme is proposed, which incorporates load balancing when selecting a mesh path for new connections. Our results show that connection level performance, including both average number of connections and connection blocking probability, can be greatly improved using the proposed mechanism compared to other admission control schemes.

Load-balancing metrics: Comparison for infrastructure-based wireless networks

“…In general, the existing various load-balancing solutions can be categorized into adjustment methods and balancing metrics. The adjustment methods include cell breathing [7,14,15], AC [13,19], and AM [10][11][12]20] schemes. In [10], the authors introduced the following three weights for evaluating the load balancing of APs: (i) each AP serves the approximate number of MDs; (ii) the AP-served traffic; and (iii) bandwidth usage, in which the traffic load is divided by the AP bandwidth (e.g., the bandwidth is 20 units/s, two MDs, the total amount of flows is four units, and the bandwidth usage is 20%).…”

“…Zhao et al proposed a metric with the amount of traffic load required to balance APs. The AC method is used to control the amount of traffic load to less than the AP bandwidth, thereby reducing packet delays and blocking rates [13]. However, the capacities of APs differ because similar levels of traffic load on these APs results in throughput and transmission delay imbalance.…”

“…(b) Network-based selection The APs play an active role in managing the request of the MD. The related approaches include cell breathing and the two following approaches: -Admission control (AC) [13,19]: This approach is used when the traffic load of the entire wireless network is overloaded. This concept is used to resist a new request and force it to alternative light-load AP when the load of an occupied AP is excessively high.…”

IEEE 802.11 Load Balancing: An Approach for QoS Enhancement

“…A scheme proposed in [14] aims to fairly distribute load between access points by changing their coverage area. Some other works describe load balancing mechanisms for 802.11 wireless networks but are applied in particular contexts such as in [15] which study a routing connection admission control in ESS (Extended Service Set) mesh networks.…”

Real-time CBR traffic scheduling in IEEE 802.16-based wireless mesh networks

“…All packets go through the BS once, either transmitted in the downlink or received in the uplink. The bottleneck in the mesh network can be either the BS or an SS that is one hop away from the SS [8]. Define a set H i as follows: h ∈ H i indicates that the receiving time of the hth station along the route of packet i has been scheduled.…”