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Line 31: === 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 =K. ~~Jagannatham~~Jagannathan\| first = Aditya\| 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