Network bandwidth is an essential factor in the design and maintenance of a functional WLAN. When building the infrastructure, you need to make a careful detection of how much bandwidth you will need to plan the right balance between performance and cost correctly.
How can you calculate WiFi bandwidth needs when designing the network? What specific considerations are involved?

In this article, we will present the reasons why it is fundamental to consider and adequately calculate the bandwidth requirements of the WiFi network you are going to deploy, to perform the most reliable network experience.

What is bandwidth in networking?

Bandwidth is the capacity of a channel to transmit data. During the transmission, the information is sent in a binary system, a language that encodes data using only two symbols (often defined as “1” and “0”, or “on” and “off”), each of which is called a bit.

The basic unit of this language, the byte, is composed of 8 bits. The bandwidth determines, therefore, the number of bytes that can be transmitted on the connection. The unit of measurement is the bits per second (bps). For example, a low definition video lasting 15 seconds, weighing 1 Megabyte, can be downloaded from an Internet site on your computer in 3-5 minutes if the connection is made via modem (56 kbps) or ISDN line (from 64 to 128 kbps). The same action takes a few seconds instead if the connection is broadband, like the one with the optical fibers (over 1000 Gbps).

Network bandwidth is the capacity of a network communications link to transmit the maximum volume of data from one point to another over a computer network or Internet connection in a given amount of time, usually one second. Bandwidth has the same meaning of capacity, and defines the data transfer rate.

Bandwidth, though, is not a measure of network speed.

As a matter of fact, the words “bandwidth” and “speed” are often misused as synonymous. The explanation of this misunderstanding can be, in part, due to their use in advertisements by ISPs that refer to speeds when they mean bandwidth. Indeed, speed refers to the rate at which data can be sent, while the definition of bandwidth is the capacity for that speed.

Why is it so important to calculate network bandwidth requirements before deploying a network?

Bandwidth can be compared to the volume of water that can flow through a water pipe. If the pipe is bigger, the water can flow in a massive quantity through it at one time. Bandwidth functions in the same way. So, the more bandwidth a data connection has, the more data it can send and receive at one time.

Consider that in any kind of deployment location, there are bandwidth limits. This means that there is a constraint to space for the data to flow. Therefore, multiple devices in a single area must share the bandwidth. Some devices request much more bandwidth than others. Greater bandwidth is absolutely necessary if proper speed must be maintained on different devices.

When do you need to calculate bandwidth?

Streaming, gaming, and other high usage activities demand a certain amount of bandwidth speed to get the best experience without buffering or lag. And the more bandwidth your network can deliver, the faster your devices will run.

Before you start designing your WiFi network, you should follow some steps to achieve your bandwidth goal.

1. Estimate how many devices will be connected to your WiFi network simultaneously

The majority of mid-high end wireless access points and wireless routers can have 255 devices connected at a time. Nevertheless, just because you can hypothetically connect 255 devices to a single WiFi router/access point doesn’t mean you should.
Each computer or device added to your network will degrade the bandwidth available to the other devices using the same connection. All those devices share the same wireless network and the same Internet connection from your broadband service provider. In this case, the congestion isn’t necessarily with the wireless connections. Still, it is with the amount of traffic or bandwidth that can pass through the Internet router to your broadband service provider.

Example
If you want to estimate how many concurrent devices will be connected, consider, for example, a hotel with 18 rooms for 2 people each. The hotel has 36 guests if it is fully-booked. If each guest has 1.2 devices, you have around 43 devices in total. We can assume that only 20 of 43 can be connected or generate significant traffic at the same time.

2. Calculate the application bandwidth requirement

Your bandwidth requirements also depend on the usage of the Internet your guests perform while being connected to your WiFi network. Some Internet applications, such as web browsing and instant messaging require low bandwidth, whereas other applications, such as video streaming and VoIP calls, require high-level bandwidth usage.

To implement a high-performance WLAN, network designers must consider external variables, such as the applications’ requirements in bandwidth and throughput networks.
Tanaza offers a useful way to calculate the bandwidth requirement of a network. We have created the tool “Access Point Selector” to suggest the ideal access point per location and application type. However, it’s also helpful to estimate the required bandwidth per-user connection. You can try it here.

In the image below, you can check the bandwidth needed and the throughput required for the mainstream applications, such as messaging, e-mails, social media, video calls, VoIP calls, web browsing, file sharing, and video streaming.

Or if you want to go more specific, the FCC (Federal Communications Commission) provides a set of guidelines for Mbps needed based on digital activity.

Alternatively, you can measure the bandwidth requirements by usage. The chart below compares minimum download speed (Mbps) needs for light, moderate, and high household use with one, two, three, or four devices at a time (such as a laptop, tablet, or game console).

So, let’s keep the hotel’s example fully booked with a maximum capacity of 36 guests. Assuming each guest has 1.2 devices, you have around 43 devices, of which 35 are connected to the network simultaneously. All of them are browsing different applications.

If you are using our Access Point Selector tool, in a hotel with 35 concurrent users employing chatting/messenger services, e-mail, social media, web browsing, and video streaming, you will have, as a result, an estimated bandwidth per user of 3.33 Mbit/s. This means that the hotel would need at minimum: Location bandwidth – 117 Mbit/s.

3. Calculate network bandwidth requirements

As previously said, the measurement unit for bandwidth is bits per second (bps). But, modern networks have greater capacity. They are mostly measured in millions of bits per second (megabits per second, or Mbps) or billions of bits per second (gigabits per second, or Gbps).

Furthermore, bandwidth connections can be symmetrical when the data capacity is the same in uploading or downloading data, and asymmetrical when download and upload capacity are not the same. In asymmetrical connections, upload capacity is usually smaller than the download capacity.

In addition to testing, you have to calculate how much bandwidth is needed to run all your networks’ applications. To understand how much capacity you need, you must calculate the maximum number of users who might be using the network connection simultaneously and multiply that number times the bandwidth capacity required by each application.

To calculate the bandwidth need required you can use the following formula:

(Application Throughput) x (Number of concurrent Users) = Aggregate Application Throughput

Going back to the hotel example, 

(3.33 Mbps) x 35 concurrent users = 117 Mbps 

Note: the result you get here might exceed the bandwidth that the internet service providers offer.

When calculating your bandwidth needs, it’s a theoretical demand upper bound estimate that can help you to calculate the number of access points needed to support the bandwidth demands in a specific location.

If you want to calculate the number of access points needed in a deployment, check our latest article Network Capacity Planning – Wireless Capacity vs Coverage.

If you are deploying wireless networks, read also WiFi network design – What to take into consideration when designing WLANs, there are many factors to consider to plan out your network deployments thoroughly.​

Let’s explain the difference among the 3 main deployment models of cloud computing: public cloud, private cloud and hybrid cloud.

The cloud can be effectively deployed in many ways by businesses of any size and industry. There are 3 main cloud deployment models that organisations can leverage based on their needs, namely public, private and hybrid cloud.

1. Public Cloud

Public cloud is the most adopted model among enterprises. According to RightScale’s report, the deployment of public cloud increased to 92% in 2018. Under this model, cloud resources are owned, maintained and managed by a third-party provider and can be securely accessed by and shared with many users at once, meaning it operates in a multi-tenant environment. The leading public cloud providers are Amazon Web Services (AWS), Microsoft Azure, and the Google Cloud Platform. For instance, Tanaza is hosted on Amazon Web Services, which guarantees the highest levels of reliability available on the market, and runs on a reliable, secure, highly-available (99,99%) and redundant cloud infrastructure.

The main benefits of public cloud are:

• Cost-effectiveness: you don’t pay for the hardware/software but only for the resources you use. Also, you save time as you don’t need to worry about maintenance;
• Reliability: public cloud allows you to host data and services on more than one cloud provider. This way, services can be replicated to avoid failures and outages;
• Flexibility: people can access the public cloud services remotely from anywhere, no matter where the offices of a company are located, and from any internet-enabled device.

2. Private Cloud

Private cloud is a type of cloud computing that delivers services to a single organisation through a specific, dedicated architecture. Under this model, the company itself is responsible for and bears the costs of the acquisition, deployment and maintenance of the cloud resources. According to RightScale’s report, the deployment of private cloud increased to 75% in 2018. The most popular vendors providing private cloud solutions are Hewlett Packard Enterprise (HPE),  VMware and Dell EMC. Private clouds are generally used among organisations that handle sensitive data and need to critically keep under control their operations, such as government and financial institutions (hospitals, ministries, banks…), big telecommunication carriers, etc.

The main benefits of private cloud are:

• Total control and customisation of the cloud environment based on the business specific needs;
• Higher scalability compared to public cloud – at a higher price;
• Improved security over its data, applications and resources, as private cloud operates on a physically isolated and dedicated architecture.

3. Hybrid Cloud

The third model is hybrid cloud, which is a combination of both public and private cloud and allows companies to be more flexible and use more services. In general, a hybrid cloud occurs when a business operating on a private cloud expands and starts using a public cloud, generating in this way a combined environment. Enterprises adopting this model can benefit from the high control and security levels for their operations offered by private clouds and, at the same time, use the additional resources offered by public clouds when they need. Nevertheless, using a combination of both public and private models requires strong IT management and, accordingly, higher investments.

Based on the nature, the size and the scope of your organisation, you can choose the cloud deployment model that better fits your business needs and take advantage of cloud technology.

Are you a carrier or a public institution operating on a private cloud, or you are forced only to use private cloud in your country, and you are interested in using Tanaza? We can help you installing Tanaza on your private cloud! For more information contact us at sales@tanaza.com.

Related articles:

Coffee as a Service – SaaS vs PaaS vs IaaS vs Private Cloud

On-premises software vs SaaS (software-as-a-service)

https://www.classichotspot.com/blog/why-your-business-needs-cloud-based-wi-fi-management/

Tanaza just released a new feature: the bandwidth control on a per user-level.

Tanaza already features the bandwidth management per SSID, which means that WiFi administrators can limit the total amount of bandwidth available for one SSID.

• Example: in a Hotel with only two guests.
  A WiFi administrator configures an SSID with a maximum bandwidth of 10 Mbps.
  If the first guest could use 7 Mbps, the second guest will only be able to use the 3 Mbps remaining.
  The bandwidth is not shared equally among WiFi users.

What is the difference with the bandwidth control per user?

The bandwidth control per user means that a network administrator can limit the amount of bandwidth one user can use on the WiFi network.
The limit is set at the user level and not, at the global level (SSID). 

The capability to specify the bandwidth users can access will guarantee the same users’experience; the bandwidth is divided equally among WiFi users. Also, Tanaza’s Bandwidth Control per Client feature comes with a “boost” function, which allows hotel guests to exceed the bandwidth limit for a few seconds when they use a WiFi service.

• Example: in a Hotel with only 5 guests.
  A WiFi administrator limits the bandwidth of the Hotel SSID at 10Mbps.
  Besides, he limits the bandwidth per WiFi users at 2Mbps.
  Each guest will have the possibility to use until 2Mbps while browsing. The bandwidth is shared equally between guests.

This new feature should solve issues especially for WiFi networks deployed in hotels where the WiFi users experience is significant.