Question

TDD is effective for _________

(a) Fixed wireless access and users are stationary

(b) Dynamic wireless access and users are stationary

(c) Fixed wireless access and users are moving

(d) Dynamic wireless access and users are moving

I had been asked this question in an internship interview.

My question is based upon Introduction to Multiple Access in chapter Multiple Access Techniques for Wireless Communications of Wireless/Mobile

Answer 1

Correct answer is (a) Fixed wireless access and users are stationary

The best I can explain: TDD is effective for fixed wireless access when all users are stationary. This makes the propagation delay does not vary in time among the users. Because of rigid timing required for time slotting, TDD generally is limited to cordless phone or short range potable access.