IST-2003-507581 WINNER D2.5 v1.0 Duplex ... - Celtic-Plus

WINNER D2.5 v1.03.4.8 Scheme HThis section discusses the case where a FDMA technique is utilised to separate AP and RS radioresources, see Figure 3-17 and Figure 3-18. At all devices transmit and receive frequencies are separatedby large duplex distance to reduce the self-interference with a single antenna system. Terminals must beable to transmit and receive on both the high and low carriers.APMTfreq. pair 1 freq. pair 2T1R4R2T3APhigh carriers (HC)HC14LClow carriers (LC)RSR1 T4 R3 T2RSLC2 3HCMTFigure 3-17: Scheme H: Multi hop forwardingfrequencyAP RS MTT1R1R3T3Hop 1 Hop 2T2R2R4T4time time timeFigure 3-18: Hops are divided by means of frequency and up- and downlinks are separated byfrequency divisionThe case depicted in Figure 3-18 is characterised as follows:1) As with the Scheme F the RS switches up-and downstream traffic from low to high carriers and viceversa (R1->T2 or R3->T4). The difference here is that the RS has a separate set of carriers andTDMA are replaced with FDMA. The interference conditions are the same.2) It is assumed that the RS cannot transmit and receive simultaneously on adjacent carriers. Theyrequire a greater duplex distance between carriers used for Tx and Rx.3) MTs need to have band-switching capabilities6) The following duplex scheme combinations are used:a) AP: pure FDDb) RS: pure FDD and band switched FDD Hybridc) Relayed MTs: band switched FDDPage 44 (121)