t (MHz) Transmit/UE Receive (MHz) Band Class FUL_low-FUL_high FDL_low-FDL_high Duplex Mode 1749.9 1784.9 1844.9 1879.9 1427.9 1447.9 1475.9 1495.9 Reserved Reserved 1447.9 1462.9 1495.9 1510.9 10 subframes are available for uplink transmissions in each radio frame. Uplink and downlink transmissions are separated in the frequency-domain. The transmission time interval in the downlink and uplink is 1 ms [107]. Frame structure Type 2 is illustrated in the lower portion of Figure 9-66. Each 10 ms radio frame consists of two half-frames of 5 ms each. Each half-frame consists of eight slots 0.5 ms long and three 9.15 3GPP LTE physical layer protocols Channel Bandwidth (MHz) Transmission Bandwidth Configuration Transmission Bandwidth Active Resource Blocks Emission Mask DC Subcarrier FIGURE 9-65 Illustration of the relationship between channel bandwidth and transmission bandwidth [111,112] Subframe Radio Frame = 10ms Frame Structure Type 1 Radio Frame = 10 ms Half Frame = 5 ms DwPTS GP UpPTS DwPTS GP UpPTS Frame Structure Type 2 FIGURE 9-66 3GPP LTE frame structures for FDD and TDD modes [107] special fields: Downlink Pilot Time Slot (DwPTS); Guard Period (GP); and Uplink Pilot Time Slot (UpPTS). The length of DwPTS and UpPTS is configurable subject to the total length of DwPTS, GP, and UpPTS being equal to 1 ms. Different configurations of the special subframe, as specified in 3GPP LTE, have been shown in Table 9-17. In this table Ts denotes the sampling time which is equal to the CHAPTER 9 The IEEE 802. 16m Physical Layer (Part I) Table 9-17 Configuration of Special Subframe (DwPTS/GP/UpPTS) [107] Normal Cyclic Prefix in Downlink Extended Cyclic Prefix in Downlink UpPTS UpPTS Special Normal Extended Normal Extended Subframe Cyclic Cyclic Cyclic Cyclic Configu- Prefix in Prefix in Prefix in Prefix in ration DwPTS Uplink Uplink DwPTS Uplink Uplink 6592 Ts 2192 Ts 2560 Ts 7680 Ts 2192 Ts 2560 Ts 19760 Ts 20480 Ts 21952 Ts 23040 Ts 24144 Ts 25600 Ts 26336 Ts 7680 Ts 4384 Ts 5120 Ts 6592 Ts 4384 Ts 5120 Ts 20480 Ts 19760 T