S130 SDS v2.0: Radio Notification on peripheral events

Similar to central links, peripheral links may also include multiple packet exchange within a single Radio (connection) Event.

Radio Notification events are as shown in Figure 1.

Figure 1. A BLE peripheral link with multiple packet exchange per connection event

To ensure that the ACTIVE notification signal is available to the application at the configured time when a single peripheral link is established, the following condition must hold (with one exception, see Table 1):

t_ndist + t_event < t_interval

The SoftDevice will limit the length of a Radio Event (t_event), thereby reducing the maximum number of packets exchanged, to accommodate the selected t_ndist. Figure 2 shows consecutive Radio Events with Radio Notification signal and illustrates the limitation in t_event which may be required to ensure t_ndist is preserved.

Figure 2. Consecutive peripheral Radio Events with BLE Radio Notification signals

Table 1 shows the limitation on the maximum number of full length packets which can be transferred per Radio Event for given combinations of t_ndist and t_interval.

Table 1. Maximum Peripheral packet transfer per BLE Radio Event for given combinations of Radio Notification distances and connection intervals. Assumes full length packets and full-duplex, HIGH/HIGH BLE bandwidth configuration.
t_ndist	t_interval
t_ndist	7.5 ms	10 ms	≥ 15 ms
800	5	6	6
1740	4	6	6
2680	3	6	6
3620	3	5	6
4560	2	4	6
5500	1	3	6

Radio Notification on connection events as a Peripheral