Signal Studio for 3GPP LTE currently supports only FDD and frame structure type 1.
Figure 1 shows frame structure type 1, which can be used in either full-duplex or half-duplex FDD mode. It consists of a 10 ms radio frame divided into 20 slots, each with a duration of 0.5 ms. One subframe consists of two consecutive slots. Ts = 1/(1500 x 2048) sec.
For FDD, 10 subframes are available for downlink transmission and 10 subframes are available for uplink transmissions in each 10 ms interval. Uplink and downlink transmissions are separated in the frequency domain.
In half-duplex FDD operation, the UE cannot transmit and receive at the same time; this restriction does not apply to full-duplex FDD operation.
Ts
Figure 1. Frame Structure Type 1 (full-duplex and half-duplex FDD)
Figure 2 shows frame structure type 2 for the SC-FDMA uplink. Frame structure type2 is applicable only to TDD and is provided for compatibility with legacy UTRA TDD systems. Each radio frame consists of two identical 5 ms half-frames. Each half-frame consists of eight 0.5 ms slots and three special fields, DwPTS, GP, and UpPTS. Subframe #0 and #5 and DwPTS are always reserved for downlink transmission.
Ts
Figure 2. Frame Structure Type 2 (TDD only)
|
Transmission BW |
1.4 MHz |
3.0 MHz |
5.0 MHz |
10 MHz |
15 MHz |
20 MHz |
|
|
Slot duration (frame structure type 1) |
0.5 ms |
0.5 ms |
0.5 ms |
0.5 ms |
0.5 ms |
0.5 ms |
|
|
Subcarrier spacing |
15 kHz |
15 kHz |
15 kHz |
15 kHz |
15 kHz |
15 kHz |
|
|
Sampling frequency* |
1.92 MHz |
3.84 MHz |
7.68 MHz |
15.36 MHz |
23.04 MHz |
30.72 MHz |
|
|
Length of SC-FDMA symbol in time units** (excluding cyclic prefix) |
2048 |
2048 |
2048 |
2048 |
2048 |
2048 |
|
|
Number of occupied resource blocks |
6 |
15 |
25 |
50 |
75 |
100 |
|
|
Number of occupied subcarriers |
72 |
180 |
300 |
600 |
900 |
1200 |
|
|
Number of SC-FDMA symbols per slot |
Normal CP |
7 |
7 |
7 |
7 |
7 |
7 |
|
Extended CP |
6 |
6 |
6 |
6 |
6 |
6 |
|
|
Cyclic Prefix (CP) length (frame structure type 1) where l is the symbol position in a slot |
Normal CP |
160 for l = 0 144 for l = 1 to 6 |
160 for l = 0 144 for l = 1 to 6 |
160 for l = 0 144 for l = 1 to 6 |
160 for l = 0 144 for l = 1 to 6 |
160 for l = 0 144 for l = 1 to 6 |
160 for l = 0 144 for l = 1 to 6 |
|
Extended CP |
512 for l = 0 to 5 |
512 for l = 0 to 5 |
512 for l = 0 to 5 |
512 for l = 0 to 5 |
512 for l = 0 to 5 |
512 for l = 0 to 5 |
|
* sampling frequency at one oversampling
** 1 time unit = 1/30.72 MHz