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© 2015 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. 

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White Paper 

Enhancing Cisco High Density Experience with 
Cisco Air Time Fairness 

Cisco has enhanced our High Density Experience solution with a new set of features. 
This white paper explains a key new feature that is one of many enhancements to 
HDX. 

Introduction 

The primary issue that Cisco

®

 Air Time Fairness for High Density Experience (hereafter referred to as Air Time 

Fairness) addresses is the inability of other solutions to permit wireless LAN (WLAN) administrators to predictably 

define what fairness means for over-the-air client traffic consumption. Thus, the advantage of Air Time Fairness is 

an improved, simple mechanism for allocating traffic consumption by groups of client devices that need differing 

levels of service. 

Air Time Fairness for High Density Experience allows a network administrator to group devices of a defined 

category and enable some groups to receive traffic from the WLAN more often than other groups. Therefore, some 

groups become entitled to more airtime than other groups. Our solution: 

1.  Allocates Wi-Fi air time for groups of user and device categories 

2.  Allows the network administrator to define airtime fairness (not the network) 

3.  Provides a simple mechanism for allocating airtime 

4.  Dynamically adapts to changing conditions in the WLAN 

5.  Provides improved fulfillment of service-level agreements (SLAs) 

6.  Augments (does not replace) standards-based Wi-Fi quality-of-service (QoS) mechanisms 

This is particularly advantageous when there is a need to provide different services to different types of users 

based on predefined SLAs (which is another way of saying entitlement). Air Time Fairness simplifies management 

of WLAN traffic consumption for heterogeneous types of users. See the use cases in the next section of this 

document for more information. 

Our solution can enable network administrators to define what fairness means within their environments with 

regard to the amount of on-air time per groups of clients. Correspondingly, the amount of traffic that can be 

consumed is also controlled. 

Air Time Fairness Use Cases 

In these areas, a public network shares a WLAN between two or more service providers and services are offered 

locally by the venue. Subscribers to each service provider can be grouped and each group can be allocated a 

percentage of airtime. The venue staff itself is also a group that can also be allocated a percentage of airtime. This 

percentage can be fixed and statically allocated if needed. Other groups cannot acquire the venue airtime.