1 Introduction
2 Overview of dynamic TD-LTE
Uplink-downlink | Downlink to uplink | Subframe number | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
configuration | Switch-point periodicity (ms) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
0 | 5 | D | S | U | U | U | D | S | U | U | U |
1 | 5 | D | S | U | U | D | D | S | U | U | D |
2 | 5 | D | S | U | D | D | D | S | U | D | D |
3 | 10 | D | S | U | U | U | D | D | D | D | D |
4 | 10 | D | S | U | U | D | D | D | D | D | D |
5 | 10 | D | S | U | D | D | D | D | D | D | D |
6 | 5 | D | S | U | U | U | D | S | U | U | D |
2.1 TDD configuration change
2.1.1 Changing the subframe configuration in Release 8
2.1.2 eIMTA in Release 12
2.1.3 Additional methods described in technology report 36.828
3 Downlink reference signal interference
4 System level interference analysis
Parameter | Value |
---|---|
Layout | Indoor office scenario [16] |
Number of floors | 3 |
eNodeB locations | Fixed, 20 per floor |
UE locations | Randomly dropped, 20 per floor |
eNodeB Tx power | 20 dBm |
UE Tx power | 20 dBm |
Number of antennas | 1 |
Antenna gains | 0 dB |
Noise level | −90 dBm |
Carrier frequency | 2.1 GHz |
Link activity probability | 0.1–1.0 |
Simulation type | Snapshot; 10,000 repeats |
5 Configuration change mechanism
5.1 Configuration change signaling
5.1.1 Configuration change algorithm
5.2 Simulation results
5.2.1 Configuration change cost
Configuration change | UL subframes | DL subframes | Switching cost |
---|---|---|---|
No change | 256 | 384 | 0 |
1 → 4 Algorithm C | 130 | 469 | 41 |
1 → 4 Algorithm A | 130 | 490 | 20 |
1 → 5 Algorithm C | 72 | 529 | 39 |
1 → 5 Algorithm A | 72 | 550 | 18 |