UMTS: Alive and Well - 4G Americas
UMTS: Alive and Well - 4G Americas
UMTS: Alive and Well - 4G Americas
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UL/DLConfiguration0Table C.7. Uplink/Downlink Allocations.Period(ms)Subframe0 1 2 3 4 5 6 7 8 9D S U U U D S U U U1 5 D S U U D D S U U D2 D S U D D D S U D D3D S U U U D D D D D4 10 D S U U D D D D D D5 D S U D D D D D D D6 5 D S U U U D S U U DAs shown in Figure C.46, the total length of DwPTS, GP, <strong>and</strong> UpPTS fields is 1 ms. However, within thespecial subframe, the length of each field may vary depending on coexistence requirements with legacyTDD systems <strong>and</strong> supported cell size. 217 Note that this assumes that the NodeB (base station in <strong>UMTS</strong>terminology) <strong>and</strong> UE switching time to be less than the duration of an OFDM symbol with extended CyclicPrefix (CP).An example of coexistence with legacy <strong>UMTS</strong> Low Chip-Rate (LCR) TDD system is shown in Figure C.46where switching point alignment between the two systems is illustrated.0.675 ms5 msLCR-TDDTS0TS1TS2 TS3 TS4TS5 TS6LTESUBFRAME 0SUBFRAME 1SUBFRAME 2SUBFRAME 3 SUBFRAME 41 msDownlinkDwPTS GP UpPTSUplinkFigure C.46. Coexistence with LCR-TDD <strong>UMTS</strong> System.Obviously, to minimize the number of special subframe patterns to be supported, not all legacy TDDconfigurations can be supported. For LCR-TDD configurations, Table C.8 was designed to providecoexistence with the 5DL:2UL <strong>and</strong> 4DL:3UL LCR-TDD splits, which are generally viewed as the mostcommon deployment configurations.217 Physical Channels <strong>and</strong> Modulation, 3GPP TS36.211.www.3G<strong>Americas</strong>.org February 2010 Page 197
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