The first article in this two-part series examined what a wireless site survey is and why it might not contribute much value toward optimizing a wireless LAN installation. In this article, we explore alternatives to the wireless site survey cost and suggest a strategy that will achieve optimal results with lower costs and greater assurance.
Historically, the biggest complaint from end users has been that wireless networks are slow or unavailable, resulting in poor productivity. Therefore, optimizing for wireless coverage alone is a poor strategy -- thus, the wireless site survey is already suspect even before it's started.
The primary way to achieve the capacity that addresses these service issues is to install more access points (APs). By aligning the physical placement of APs with clusters of user demand, you enable the more rapid frequency reuse that maximizes the available radio spectrum.
Wireless APs -- low cost, high capacity
No wireless site survey can determine how to optimize AP density. Instead, review network logs to estimate the locations of demand. You can use data from the continual post-installation monitoring that's found in management consoles and then deploy APs accordingly.
Of course, this data will vary over time and will likely indicate that additional APs are required. IT and network managers should budget about 10% of the total cost of a project for additional APs. Installation costs can be significant, especially if new cabling is required. But the low cost and cost-effectiveness of APs today, along with self-configuration capabilities, result in a better use of scarce IT dollars than the wireless site survey cost.
Thus, the strategy is: Consider where wireless demand will be, deploy devices accordingly, examine the results and fix any problems with additional APs that always add capacity.
Upgrades to newer capacity-enhancing technologies, like 802.11ax, are also an option. These updates could be staged over time as logistics and budgets allow. Additionally, vendors can often push out automatic updates and optimizations for their products.
Wi-Fi systems require ongoing management
You can't always avoid active site surveys in which you walk around an office with a mobile detector to measure the strength of a temporary Wi-Fi AP. While most carpeted, open office environments can skip the survey process, dense manufacturing floors, other industrial settings and buildings with unusual construction might still benefit from a site survey.
The ongoing monitoring and data gathering, either by APs or dedicated sensors from assurance vendors, is key to success as operating conditions change both quickly and in patterns depending on demand over time.
Recently, I chatted with Anil Gupta, CTO of Wi-Fi assurance vendor Wyebot, based in Marlborough, Mass. He said:
Site surveys can be valuable in some circumstances. But the fundamental and inherent variability in both operating environments and radio frequency performance dictate a continuous, rather than snapshot, strategy for managing any Wi-Fi installation. Attempting to predict performance is nowhere near as valuable as continually monitoring and optimizing the WLAN [wireless LAN] as conditions, including user locations and traffic demands, change both instantaneously and evolve over time.
In other words, invest in tools that provide ongoing optimization, rather than a snapshot attempt at the prediction of performance that probably won't be helpful considering the large number of variables involved.
Emerging technology also a factor
The increasing role of AI and machine learning in automatic problem detection and correction will have a profound effect on future network operations strategies. Managers, for instance, could receive text messages that a new AP is required in a certain location and installation is scheduled for tomorrow morning.
The bottom line: The financial cost of a formal wireless site survey cannot be justified in many cases. Instead, determine loading, locations and trends, and then deploy, monitor and enhance the physical installation as required and as part of equipment upgrades. Emerging tools will automate and reduce the cost of this process even further. You can address gaps in coverage or capacity that appear over time more cost-effectively by adding APs, software-based capabilities and technology upgrades.
In other words, the cost of a wireless site survey can buy a lot of APs.