Site Survey Theory .... All Comments, Thoughts, and Theories are welcome

Hello All,
I am seeking opinions about a survey methodology that was told to me today. I have my own thoughts about it but I just want to make sure I'm not off base so any help is greatly appreciated. The requirements for the wireless network are as follows:
- Data and Voice
- Clients will utilize all bands but newer devices will be pushed to 5GHz
- Clients are laptops and iPads right now but the future goal is to implement BYOD
So, here is the methodology that was told to me ... "We survey only in the 5GHz spectrum because if you have coverage in that spectrum (5GHz) the coverage in the 2.4GHz will be the fine or even better than that. Therefore, we feel comfortable not capturing the data in the 2.4GHz spectrum."
Thoughts about the above statement are welcome!!!
Thanks,
Malwan

The essential question for a high-density design is how many channels for each band will be needed to match the client base? This can be a tricky question since even dual band capable clients do not always select the faster 5 GHz band. Since bandwidth in 2.4 GHz is going to be limited, 5 GHz must be relied on to reach the goal.
Dual band adapters have been shipping with most laptops for some time. This does not mean that every laptop is a dual band client, but many are. Simply having a dual band client does not guarantee that it will choose 5 GHz over 2.4 GHz. The Microsoft Windows operating system defaults to a Wi-Fi channel search that starts with the 5 GHz channel 36 and continues searching through all of the 5 GHz channels that the client is capable of. If no 5 GHz AP is found then it will continue the search in 2.4 GHz starting at channel 1. Unless the Windows default is changed or the user has chosen a third party Wi-Fi utility to set spectrum preference to 2.4 GHz, the client radio will first try to associate to a 5 GHz AP. Apple Computer's latest release for Atheros and Broadcom chipsets also searches 5 GHz first.
The Cisco BandSelect feature enables the infrastructure to optimize these types of client connection choices. Where possible, it helps make sure that devices are attaching to the 5 GHz spectrum channels where interference sources tend to be significantly lighter. A much greater channel selection leads to the alleviation of bandwidth challenges.
Tablet computers and smartphones have begun entering the market at a staggering rate. The vast majority of smartphones shipping today operate in 2.4 GHz only. While many of them are 802.11n clients, of these most have implemented a single input single output (SISO) rather than Multiple Input, Multiple Output (MIMO). A SISO device is only capable of supporting MCS7 data rates, or 54 Mbps.

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Site Survey Theory .... All Comments, Thoughts, and Theories are welcome

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