RF-IQ

Aerohive’s RF-IQ optimizes the intelligence of Aerohive Wi-Fi infrastructure by using distributed control features to adapt to changing RF requirements. RF-IQ solves complex wireless networking challenges with a combination of radio intelligence features, high density optimizations, and hardware innovation. RF-IQ shapes the RF environment to provide the most optimal experience for all types of client devices and applications. RF-IQ features do not require any additional infrastructure or client software components.


Wi-Fi Reality

Coverage vs Capacity Oriented Networks

Coverage-oriented networks are the networks of the past, with a few rare exceptions. People want wireless and they want fast wireless. Wi-Fi has become the primary way of accessing the network, and the number of devices and types of devices that are connecting to Wi-Fi are still growing exponentially. New client devices are mostly 802.11ac 5 GHz with 2x2:2 MIMO capabilities. Applications that are in use on the wireless devices are more and more demanding. VoIP over Wireless and High Definition video are not exceptions anymore. All this dramatically increases the demand for the bandwidth in the RF, half-duplex, medium.

Clients are making decisions

Wi-Fi infrastructure does not directly control and manage clients. Clients are making the decisions to connect to a particular access point, to roam to another access point, and clients even choose the frequency they want to run on. Clients have a very narrow view of the network compared to infrastructure devices, and that limited information can lead the client to make poor decisions.

Legacy/ slower clients have to be supported

Many times new client devices have to co-exist with the older, less capable devices. The problem is that slower devices force newer, faster devices to compete for the airtime. This basically penalizes faster devices and ‘rewards’ slower devices. Forbidding older and slower devices from connecting to the network may not be an option in the organization.

Solution

Best use of the spectrums

Wireless infrastructure should be capable of helping clients make better decisions. For example, 802.11ac capable clients should be helped to choose the 5 GHz spectrum.

2.4 GHz spectrum has only 3 non-overlapping channels available and it should be used only by legacy devices and as a backup medium for client overflow. 5 GHz channels depend on the country, but there are at least 8 non-overlapping channels that can provide access which reduces co-channel interference and increases bandwidth. Maximum data rates on 5GHz are 200-300 % higher than the data rates on 2.4 GHz.

Allow backward compatibility

Wi-Fi client types vary dramatically in standards, antenna, power, and radio sensitivities. The RF environment must be able to provide fair service to any client that connects.

Best possible performance for all clients

Wireless infrastructure should guarantee the maximum performance to all clients according to their capabilities. That means that all clients should have fair access to the airtime and that mixed client environments do not degrade performance for all clients.

Aerohive's Solution

Innovative Antenna Technology

Typical MIMO (multiple-in multiple-out) antennas use spatial diversity to transmit multiple spatial streams on the same channel. Spatial diversity is typically achieved by physical separation between antenna. In addition, RF waves go through polarization changes as they travel through the air. Polarization changes can be quite damaging to performance at the receiver side if the polarizations do not match. Aerohive has developed a customized, redundant, polarization diverse antenna array that help the receiving side to be immune to these polarization challenges. The results are uncompromised performance in dual 5 GHz and better rate over range performance. Observed range improvements are up to 40%.

ACSP (Automatic Channel Selection and Power)

ACSP is the protocol that Aerohive devices use to communicate and control the selection of channels and power settings by sampling the RF environment. The algorithm has been enhanced for dual 5 GHz mode. You can specify how AP selects the 5 GHz channels and transmit power to avoid interference from two radios on the same band in the same box.

Client Optimizations:

Band and client steering: By steering dual band wireless clients to 5 GHz band, APs provide opportunities for better throughput to those clients and also ease the congestion for the clients remaining in the 2.4 GHz spectrum.

Load Balancing: If an Aerohive access point becomes overloaded with too much traffic, it load balances client association requests to nearby APs with more available capacity.

Weak Signal Probe Request Suppression: Clients may not use sophisticated mechanisms to choose the best access point to connect to and Aerohive will prevent clients’ connection when SNR is not at the acceptable levels. See next

Signal to Noise Threshold: An SNR of 10 dB or lower is generally considered poor and an SNR of 25 dB or greater is generally considered good. Aerohive gives an admin the options to adjust the thresholds to customers’ environments.

Client SLA Settings: To counter traffic congestion from clients with otherwise healthy connection, APs can monitor client throughput and dynamically increase amount of airtime for clients with the significant application backlog.

Dynamic Airtime Scheduling: All clients, faster and slower legacy clients, get their proportion of the airtime. Faster client finish faster and slower clients finish at the same time. The fast client is rewarded and slow client is not penalized and overall network performance is increased.

Aerohive Why RF-IQ

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