ETSI DFS regulatory
The ETSI regulatory standard EN-301-893 specifying DFS is still in draft mode, with the current version V1.5.1 (2008-12) being tagged as final draft.
The latest evolution from V1.4.1 (2007-07) to 1.5.1 among others included changes in the definition of radar test signals that have significant impact on the implementation of DFS detection algorithms, especially the balancing between true and false positives.
For a better overview and comparison, the relevant information from those freely available draft documents are put together on this page, basically taken from the appendices D.
Parameter | Value |
Channel Availability Check Time | 60 s |
Channel move time | 10 s |
Channel Closing Transmission Time | 260 ms |
Non-Occupancy Period | 30 min |
Maximum transmit power (EIRP) [mW] | Value master [dBm] | Value slave [dBm] |
>= 200 | -64 | -64 |
< 200 | -62 | N/A |
Notes:
Radar test signal | Pulse Width [µs] | PRI [pps] | Pulses per burst [ppb] |
1 - Fixed | 1 | 750 | 15 |
2 - Variable | 1, 2, 5 | 200, 300, 500, 800, 1000 | 10 |
3 - Variable | 10, 15 | 200, 300, 500, 800, 1000 | 15 |
4 - Variable | 1, 2, 5, 10, 15 | 1200, 1500, 1600 | 15 |
5 - Variable | 1, 2, 5, 10, 15 | 2300, 3000, 3500, 4000 | 25 |
6 - Variable modulated | 20, 30 | 2000, 3000, 40000 | 20 |
The detection probability Pd at 30% channel load is given as 60% for all test signals.
Parameter | Value |
Channel Availability Check Time | 60 s (see note 1) |
Maximum Off-Channel CAC Time | 4 hours (see note 2) |
Channel Move Time | 10 s |
Channel Closing Transmission Time | 1 s |
Non-Occupancy Period | 30 minutes |
Notes:
EIRP Spectral Density [dBm/MHz] | Value [dBm] (see notes 1 and 2) |
10 | -62 |
Notes:
Test signal # | Pulse width [µs] | Pulse repetition frequency PRF [pps] | # of PRFs | Pulses per burst [ppb] |
0 (ref.) | 1 | 700 | 1 | 18 |
1 | 0,8 … 5 | 200 … 1000 | 1 | 10 |
2 | 0,8 … 15 | 200 … 1600 | 1 | 15 |
3 | 0,8 … 15 | 2300 … 4000 | 1 | 25 |
4 | 20 … 30 | 2000 … 4000 | 1 | 20 |
5 | 0,8 … 2 | 300 … 400 | 2/3 | 10 |
6 | 0,8 … 2 | 400 … 1200 | 2/3 | 15 |
Parameter | Detection Probability (Pd) [%] | |
Channels whose nominal bandwidth falls partly or completely within the 5 600 MHz to 5 650 MHz band | Other channels | |
CAC, Off-Channel CAC | 99,99 | 60 |
In-Service Monitoring | 60 | 60 |
Notes: