On the Selection of Guard Period and Cyclic Prefix for Beyond 4G TDD Radio Access Network

Konferenz: European Wireless 2013 - 19th European Wireless Conference
16.04.2013 - 18.04.2013 in Guildford, UK

Tagungsband: European Wireless 2013

Seiten: 5Sprache: EnglischTyp: PDF

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Lähetkangas, Eeva; Pajukoski, Kari; Tiirola, Esa (Nokia Siemens Networks, Oulu, Finland)
Berardinelli, Gilberto; Tavares, Fernando; Mogensen, Preben (Nokia Siemens Networks, Aalborg, Denmark )
Harjula, Ilkka (VTT Technical Research Centre of Finland, Oulu, Finland)
Raaf, Bernhard (Nokia Siemens Networks, Munich, Germany)

In parallel with ongoing standardization of third generation partnership project (3GPP) Long Term Evolution – Advanced (LTE-A), also referred as 4G, the discussion on next generation beyond 4G (B4G) radio access technologies is already active. Purpose of B4G system, expected to be available in 2020, is to cope with the exponential increase of mobile data traffic. In this paper we analyze the feasibility of LTE-A and wireless local area network (WLAN) physical frames against B4G requirements and discuss how the B4G environment, radio channel properties and evolved component technology affect the design of the physical layer frame. We analyze the B4G physical subframe numerology including aspects such as time division duplex (TDD) switching time and cyclic prefix (CP) duration. The proposed numerology allows to design a B4G-optimized TDD physical subframe structure which further enables reaching the very tight physical layer round trip time (RTT) requirements. Index Terms — Beyond 4G, TDD, OFDM, cyclic prefix, guard period, frame structure