Procedures for Optimizing Wireless Networks in Software

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Procedures for Optimizing Wireless Networks
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Client Load Balancing
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Client load balancing is not available with all wireless equipment It is not a required part of the 80211 standard Vendors that include advanced client load balancing features require the use of a centralized switch or controller that communicates with the clients and APs in order to provide the best association at a given time Clients are load-balanced across APs connected to a single controller Load balancing does not usually occur across controllers In fact, at the time of this writing, I don t know of any vendors offering load balancing across controllers Cisco controllers provide load balancing across APs within a controller, which is often called aggressive load balancing Simple client load balancing occurs during the association with the APs The client attempts to associate with the AP, and a non-busy AP will accept the association A busy AP will send back a reason code 17, which is part of the 80211 standard The reason code 17 is not acknowledged by all clients, as it is not required by the standard If the client acknowledged reason code 17, it will immediately move to another AP If it does not, it will send an associate request to the same AP, and this time the AP will let the client in, even though it is busy with enough other clients If a WLAN vendor supports client load balancing after the initial association (for example, forcing the client to move to a different AP without the roaming of the client), this would be implemented using proprietary methods
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The first choice that will impact the available throughput is the PHY or PHYs you decide to implement Obvious issues include the data rate supported by 80211a (OFDM) and 80211g (ERP) as compared to 80211b (HR/DSSS), but there are also not-so-obvious issues such as ERP protection mechanisms When an AP implements the 80211g or ERP PHY and an 80211b or HR/ DSSS client associates with that AP, the AP will usually implement a protection mechanism that reduces the overall throughput of the WLAN This behavior is because transfers that use the OFDM modulation included in the ERP PHY must
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first set a counter in all non-ERP clients that are associated with the AP This action is accomplished by transmitting RTS and/or CTS frames with a duration that is greater than or equal to the time needed to transmit the actual OFDM-modulated frame and responses The extra overhead reduces the throughput of an ERP BSS drastically and should be considered when implementing your WLAN You can often more than double the total throughput in a BSS by ensuring that only ERP-based clients are allowed to connect to any WLAN in the vicinity and overlapping channels Furthermore, you can force the AP to reject associations below a particular data rate so that even visiting clients (those that are out of your control) will not impact your BSS on an ongoing basis As an example, in tests performed by CNET Labs (reviewed April 17, 2003, by Brian Nadel), a Buffalo AirStation WLAN router provided 196 Mbps of throughput in an ERP-only configuration, but this dropped to 79 Mbps in a mixed-mode implementation with both ERP and HR/DSSS PHY based clients (see http://reviewscnetcom for more information) You must also consider the range of the PHY you select Generally speaking, an 80211g BSS will have a greater range with higher data rates at a greater distance than an 80211a BSSs The 80211n PHY should provide an even greater range than what is provided by ERP devices today
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You must ensure that the wired port on your APs and WLAN routers is fast enough to keep up with the WLAN Not only should the Ethernet port that is in the AP or router be included, but also the Ethernet port that the AP or router connects to If the port is a 10 Mbps port, it will not be able to keep up with the demands of the WLAN, assuming the users communicate more with devices and services on the wired LAN than they do with each other In most cases, you will want a minimum of a 100 Mbps port for connections to the APs and a 1000 Mbps port for the uplink connection from the switch to the rest of the network For example, you may choose to connect five APs to a switch and have an average of fifteen users associate with each AP If the switch provides only a 100 Mbps uplink to a 1000 Mbps infrastructure, the uplink port in the switch will act as a bottleneck that downgrades the average maximum throughput for your five APs Having a 1000 Mbps (gigabit) uplink can resolve this issue Another fact to consider is that many wired switches, particularly those aimed at the SOHO and SMB market, are labeled as gigabit switches, but they function in 100 Mbps mode much, if not all, of the time Look closely at the documentation to see if the switch operates at the rate of the slowest connected device or if it operates
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