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Towards Adaptive WLAN Frequency Management Using Intelligent Agents 121ables will give information about the number of frames with errors (MIB:FCS), thenumber of frames delivered correctly (MIB:InUPkt), the number of associated stations(MIB:NAS) and the frequency channel (MIB:Channel), so that the agent canhave an internal representation of the environment. Secondly, the agent handles incomingmessages issued from other agents. The message contents are examined andprocessed accordingly. The exchange of information between neighboring agentsimproves the channel assignment. The agent finally has to perform local computationto determine the most appropriate channel.The overall agent architecture and processes are depicted in Figure 1.Fig. 1. AWM Agent ArchitectureWe now briefly introduce the general scenario involving our AWM_agents and relatedaccess points. The optimization algorithm we have implemented is currently beingpatented and is therefore not detailed in this paper. It is however important to mentionthat the overall architecture perfectly suits a wide range of distributed optimizationalgorithms.The monitoring task and the message processing are implemented by means of twoJade cyclic behaviors. The monitoring process is implemented into the MonitorBehaviour,while message handling is implemented into the MsgBehaviour.The AWM_agent queries the SNMP agent in order to retrieve the information fromthe access point, which is controlled by the agent (1). In case of interference, theagent activates the optimization algorithm (2) and computes the new channel to beassigned to the access point. The new channel is set via a SNMP request (3). Theagent then sends the new channel to the neighboring agents (4). The receiving agentreads the message contents, makes sure that it fits the AWM ontology and in turnactivates the optimization algorithm if necessary (5) to compute the new channelbased upon the updated information. Finally, the new channel is assigned by means ofa SNMP request (6).
122 F. Gamba, J.-F. Wagen, and D. Rossier4 Basic Principles for Channel Assignment OptimizationClassical frequency optimization in cellular networks is based on simple rules regardingfrequency channel allocation. Usually, the same frequency and even an adjacentfrequency cannot be repeated at the same location or neighbored locations.The particular definition [8] of overlapping frequency channels in WLANIEEE802.11b with DSSS (Direct Sequence Spread Spectrum) and the CSMA/CA(Carrier Sense Multiple Access/Collision Avoidance) technique lead that a more complexrules regarding frequency channel allocation. Indeed, measurements as depictedon Figure 2 shows that a better user throughput is obtained when there is either a totaloverlapping or, as expected, no overlapping of the interfering channels allocated todifferent access points.Fig. 2. Throughput measurements versus channel separationFig. 3. Optimization functionFigure 2 reports FTP total throughputs measured in the following conditions: twousers, each linked to its own access point: one with frequency 6 (AP1) and the otheraccess point (AP2) with the frequency channel x (value on the x-axis). The result
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Lecture Notes in Computer Science 2
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Samuel Pierre Michel BarbeauEvangel
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PrefaceAd Hoc Networks are wireless
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Program CommitteeG. Alonso, ETHZ, S
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XTable of ContentsResisting Malicio
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2 H. Dubois-Ferrière, M. Grossglau
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10 H. Dubois-Ferrière, M. Grossgla
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SAFAR: An Adaptive Bandwidth-Effici
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38 L. Qin and T. Kunzthese two prot
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42 L. Qin and T. KunzP = Prdlog( )
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48 L. Qin and T. Kunz6. J. Broch et
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50 M. Diha and S. Pierrethe propose
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Proactive QoS Routing in Ad Hoc Net
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62 Y. Ge, T. Kunz, and L. LamontFig
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3BerlinHeidelbergNew YorkHong KongL
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Organizing CommitteeConference Co-c
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Table of ContentsSpace-Time Routing
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Author IndexAlonso, G. 104Bachir, A
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