How are users (UEs) scheduled in a TDD 5G system, that is, how a base station handles its users in TDD mode if the pilot signals used are QPSK modulated. How many orthogonal pilots the base station can handle at the same time for 5G systems. In TDD, the base station can communicate with n users at the same time, or these users have only one time slot for communication.
The user scheduling is non-standardized, so that each vendor can optimize it as they like.
Pilots are sent on orthogonal resources, but data can be send on the same time and frequency.
Due to the reciprocity assumption in TDD, whereby the UL and DL share the same frequency, the users could sent any orthogonal pilot sequence (e.g. DFT sequence or hadamard, so on) in the UL. The BS in turn would estimate the UL channel and send the date on the DL using the UL channel estimation just using the conjugate transpose. I hope this help.
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