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Line 32: === 3G systems === {{Expand section\|date=November 2014}} Although most major 3G systems are primarily based upon [[CDMA]],<ref>{{Cite book\|url=https://books.google.com/books?id=zLz-CwAAQBAJ&q=3G+systems+are+primarily+based+upon+CDMA&pg=PT24\|title=Principles of Modern Wireless Communication Systems\|last=Jagannatham\|first=Aditya K.\|publisher=McGraw-Hill Education\|year=2016\|isbn=9789339220037}}</ref> time-division duplexing (TDD), packet scheduling (dynamic TDMA) and packet -oriented multiple access schemes are available in 3G form, combined with CDMA to take advantage of the benefits of both technologies. While the most popular form of the [[UMTS]] 3G system uses CDMA and [[frequency-division duplex]]ing (FDD) instead of TDMA, TDMA is combined with CDMA and time-division duplexing in two standard UMTS UTRA.

Time-division multiple access: Difference between revisions