Channel Sounding Timing Parameters¶
Many parameters impact Channel Soundings procedure duration. Bluetooth® LE 6 specification defines mandatory and optional values for some of these parameters. Other timing parameters are fixed.
The two first sections below show the settings defined by the specification. The first includes the parameters having several possible values and which one are supported by BLE5-Stack. The second, the fixed ones as defined in the specification. The third one shows the timing parameters based on the packet view.
Variable Parameters¶
Parameter |
Description |
Supported |
|---|---|---|
T_FCS |
Time for Frequency Change Spacing |
80 µs | 100 µs | 120 µs | 150 µs |
T_IP1 |
Time for Interlude Period 1 |
40 µs | 50 µs | 60 µs | 80 µs | 145 µs |
T_IP2 |
Time for Interlude Period 2 |
40 µs | 50 µs | 60 µs | 80 µs | 145 µs |
T_SW |
Time for antenna switch |
1 µs | 2 µs | 4 µs | 10 µs |
Optional PHY supported |
Physical layer |
RFU | 2M PHY | 2M BT PHY |
T_PM |
Time for Phase Measurement |
10 µs | 20 µs | 40 µs |
Note
Bolded values are mandatory, the others are optional.
Fixed Parameters¶
Parameter |
Description |
Supported |
|---|---|---|
T_FM |
Time for Frequency Measurement |
80 µs |
T_GD |
Time for Guard period |
10 µs |
T_RD |
Time for transmission (RampDown) |
5 µs |
T_SY |
Time for synchronization sequence (CS packet) |
LE 1M PHY = 44 µs | LE 2M / 2M 2BT = 26 µs |
T_MAX_PROCEDURE |
Time after a CS procedure is considered complete and closed |
RFU | 2M PHY | 2M BT PHY |
