Transmission control methods with multihopped environments in cognitive wireless networks

Abstract

Cognitive wireless network (CWN) is expected as one of the most efficient transmission methods to solve today's wireless problems like the lack of wireless bands or the efficient usage of limited wireless resources. However, CWN have not established effective transmission methods considered with QoS or user-oriented transmission methods. In this paper, selective transmission control method in CWN considering with end-to-end QoS based on user policies is proposed. First, at the observation stage, the physical data such as electric field strength, bit error rate, jitter, latency, packet error rate, and throughput are observed. Then, at the decision stage, analytic hierarchy process (AHP) with user policy is applied for decision making process with those parameters. Finally, the action stage, one of the suitable links is chosen and changed links and networks. Also, the route selecting method is proposed based on extended AODV protocols. When route changes come to need, considerable wireless routes are listed by AODV protocol including network conditions. Then, the following three methods are used for route selection: (1) Route selection so that Maximizing End-to-End network conditions among all of the routes. (2) Route selection so that applying End-to-End AHP selection among all of the routes. (3) Route selection so that using min-max methods for the results of the policy based AHP. In our simulation, ns2 is used for the computational results to the effectiveness of the suggested transmission methods in CWNs. The results showed the effectiveness of the proposed methods.

Proposal of Autonomous Cloud Based Network Control Methods for Disaster Information Network System with Cognitive Wireless Network

“…As our previous studies [1][2] [3], local wireless network section is based on Cognitive Wireless Network System. In the network as Figure 2, there are fixed wireless stations with self-productive electric power system such as solar and wind system, and there are also mobile stations with wireless cars and ballooned wireless systems [4].…”

“…As the previous studies [1][2] [3], the cognition cycle is introduced to our proposal method for the optimal selection of wireless link and route. The cognition cycle is consisted of three stages; the observation stage, the decision stage, and the acting stage.…”

“…Therefore, Disaster Information Network System needs immortal connections for providing such important information. The authors have been studying the robust network connection methods based upon cognitive wireless network system so far [1][2] [3]. However, in order to provide important disaster information, it is also necessary to consider about the network configuration of the content's servers and QoS control for such as web based life safety information system.…”

Performance Evaluation of Multihopped Cognitive LANs

“…The policy to use the link is also set through the GUI in advance. The decision making of this link selection is held by Extended AHP method [10] which is possible to deal with various evaluated factors. The link selection method by Extended AHP is carried out in the following processes:…”

A methodology to optimize query in wireless sensor networks using historical data

“…Moreover, the energy consumed in transmitting over large distance is proportional to distance (Heinzelman et al 2000). Thus, in order to avoid direct transmission to BS, many energy efficient routing algorithms based on multi-hop routing paradigm have been proposed (Uchida et al 2010;Hiyama et al 2010;Nose et al 2010). Furthermore, for reducing the in-network sensory traffic, several data reduction techniques such as packet merging, data aggregation and compression have been proposed for WSNs.…”