How to help enterprises improve the WiFi performance of wireless LAN?

Assuming your company has no money for a wireless LAN upgrade in its 2018 budget process, that means you’ll be managing your existing Wi-Fi infrastructure for at least another year. While it would be much easier to “rip and replace” your aging wireless LAN with state-of-the-art access points, it can incur significant expense.

At the same time, the pressure on overloaded WLANs continues to increase. The number of devices they must support is soaring, users' expectations for seamless Wi-Fi performance are getting higher and higher, and corporate mobility requirements are increasing. Fortunately, there are many ways to quickly improve Wi-Fi performance using existing WLAN architectures. Moreover, these techniques are not expensive, and most require some time and effort rather than capital investment.

If you try one or more of the Wi-Fi boosting tips mentioned below, you may find that your existing hardware can indeed support your growing wireless needs until the next budget cycle. Next, let's look at what you can do to help improve the WiFi performance of your enterprise WLAN.

[[220008]]

Disable 802.11b data rate

In 2018, it's safe to assume that the wireless devices running on your network are at least 802.11g capable. That being said, there are still many networks that allow 802.11b data rates, which can drastically slow down other devices connecting in the 2.4 GHz band. On enterprise-grade Wi-Fi hardware, it's easy to disable 802.11b data rates, which will force wireless clients to connect using 802.11g or higher speeds and eliminate other wasted spectrum.

Identify and eliminate wireless interference

Next, to improve Wi-Fi performance, wireless interference should be identified and eliminated whenever possible, which is where a Wi-Fi spectrum analyzer comes in. A spectrum analyzer can scan the transmission frequencies in the 2.4 GHz and 5 GHz ranges where 802.11 Wi-Fi operates. Some vendors' wireless access points can be turned into spectrum analyzers, and installing special software on a laptop or tablet can also accomplish this.

Whatever method you choose, the goal should be to identify where the interference is occurring and determine its source. In many cases, interference is caused by microwave ovens, cordless phones/security cameras, or malfunctioning Bluetooth devices. Another common problem is surrounding businesses using Wi-Fi interfering with your space. Sometimes it is possible to completely eliminate the source of interference. In other cases, it is more feasible to find an area of ​​the 802.11 band and manually set the channel accordingly. In both cases, lower interference will increase user efficiency and speed.

Repositioning the wireless access point

Moving the location of your wireless access points can make a world of difference in the performance of your wireless LAN. Wireless signals can be reflected, absorbed, or simply not able to penetrate certain physical materials between the wireless access point and the end user. Repositioning access points can also help alleviate dead spots in important areas. Sure, you can simply move the wireless access point in the ceiling and hope for the best. A better approach is to do a Wi-Fi site survey, which will tell you where dead spots and interference exist. With this information, you can more appropriately reposition the wireless access point and expect better results.

Manage throughput for users and applications

As the number of wireless devices increases, more data is competing for limited Wi-Fi bandwidth. However, there are ways to prioritize user and application data to get access to certain wireless data streams over others. For example, if your enterprise has a relaxed BYOD policy, don't put end-user personal devices on the corporate network. Not only does this create a security threat, but it also makes it more difficult to distinguish between mission-critical wireless data and employees streaming video. Whenever possible, create a BYOD or guest SSID and rate limits on a per-SSID or per-user connection basis. This way, you limit the maximum throughput for non-critical data transmission, freeing up most of the bandwidth for business purposes.

In addition, security tools on the network, such as next-generation firewalls, can inspect internetwork traffic at the application layer and limit VPN throughput in this way. Policies can then be created to shape traffic or block application types, such as social networking, peer-to-peer, gaming, and streaming.

Band control

Many enterprise wireless manufacturers offer customers the ability to implement band steering. This is essentially the wireless end device connecting to 5GHz where there is less chance of wireless interference, which is particularly effective in urban environments where neighboring Wi-Fi interference becomes a significant issue. While some believe that band steering is overstated by manufacturers, it is indeed useful in many environments.

Channel Bonding

Finally, for those who are struggling to deliver wired-like speeds over Wi-Fi, you can choose to bond channels to improve performance. Channel bonding essentially combines two, four, or even eight channels so that communications between WiFi end devices and wireless access points can utilize a wider spectrum, digitally doubling throughput.

But keep in mind that channel bonding introduces more opportunities for channel interference. For example, in the 2.4GHz range, there is the opportunity to create a 40MHz bonded channel, which significantly increases the chance of interference. This is why channel bonding is rarely recommended.

However, in the 5GHz range, channel bonding can be performed to create 40 or even 80MHz channels, depending on the amount of interference around. Keep in mind that the more channels you bond, the fewer non-overlapping channels you have available. While 160MHz channels are technically possible, you may run into interference issues similar to bundling 40MHz channels together in the 2.4GHz spectrum.