Timing precision requirements in telecommunications
| Application | Precision needed |
|---|---|
| Wireline (sources of timing) | |
| PRTC (primary reference time clock) | ± 100 ns with respect to Coordinated |
| Universal Time (UTC) | |
| ePRTC (enhanced primary reference time clock) | ± 30 ns with respect to UTC |
| Wireless | |
| CDMA2000 | ± 3-10 μs |
| TD-SCDMA | ± 3 μs |
| WCDMA-TDD (NodeB TDD mode) | ± 2.5 μs |
| W-CDMA MBSFN | ± 12.8 μs |
| LTE MBSFN | < ± 1 μs (spec. still under study) |
| W-CDMA (Home NodeB TDD mode) | Microsecond-level accuracy |
| WiMax | ± 1-1.43 μs |
| LTE-TDD (wide area base station) | 3 μs (small cell, < 3 km radius) |
| 10 μs (large cell, > 3 km radius) | |
| LTE-TDD (home area base station) | 3 μs (small cell, < 500 m radius) |
| LTE-TDD to CDMA handovers | ± 10 μs |
| IP network delay monitoring | ± 100 μs to ± 1 ms |
| Application | Precision needed |
|---|---|
| Wireline (sources of timing) | |
| ± 100 ns with respect to Coordinated | |
| Universal Time ( | |
| ePRTC (enhanced primary reference time clock) | ± 30 ns with respect to |
| Wireless | |
| CDMA2000 | ± 3-10 μs |
| TD-SCDMA | ± 3 μs |
| WCDMA-TDD (NodeB | ± 2.5 μs |
| W-CDMA | ± 12.8 μs |
| < ± 1 μs (spec. still under study) | |
| W-CDMA (Home NodeB | Microsecond-level accuracy |
| WiMax | ± 1-1.43 μs |
| LTE-TDD (wide area base station) | 3 μs (small cell, < 3 km radius) |
| 10 μs (large cell, > 3 km radius) | |
| LTE-TDD (home area base station) | 3 μs (small cell, < 500 m radius) |
| LTE-TDD to | ± 10 μs |
| ± 100 μs to ± 1 ms |
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