I want to know how wifi works for upstream (device to wifi AP), whether its TDMA in the same channel as downstream or it uses any other channel. Also the frame duration for both upstream and downstream showing inter-frame intervals.
The commercial Wi-Fi (802.11) products are using DCF and the backbone of DCF is CSMA/CA algorithm. In CSMA/CA there is no dedicated channel for Wi-Fi users (it is not similar to cellular networks). Thus, all users are functioning over a shared half-duplex medium which Wi-Fi ISM frequency bands (channels). the frame duration and inter-frame space values can be obtained from the standard documents. there are a lot of publications on this area to refer them.
The most direct (although definitely not the easiest) way of understanding how Wi-Fi (IEEE 802.11-2012) works is to get the standard from the IEEE web site. It's free given you accept the terms of use. The standard is also nowadays really extensive, so you really need to know what you what part of the standard specifications you are interested.
http://standards.ieee.org/about/get/802/802.11.html
IEEE 802.11 uses the ISM band. More precisely, (possibly overlapping) channels are defined.
The AP and the stations MUST select and use the same channel to transmit and receive their frames. The devices implement CSMA-CA with a half-duplex radio.
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