5.7 Setting delay between TX and RX (RXTimingSetupReq,
- RXTimingSetupAns)
- The RXTimingSetupReq command allows configuring the delay between the end of the TX
- uplink and the opening of the first reception slot. The second reception slot opens one
- second after the first reception slot.
| Size (bytes) | 1 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| RXTimingSetupReq Payload | Settings | ||||||||
| 8 | |||||||||
| 9 | The delay (Delay) field specifies the delay. The field is split in two 4-bit indexes: | ||||||||
| Bits | 7:4 | 3:0 | |||||||
| Settings | RFU | Del | |||||||
| 10 | |||||||||
| 11 | The delay is expressed in seconds. Del 0 is mapped on 1 s. | ||||||||
| Del | Delay [s] | ||||||||
| 0 | 1 | ||||||||
| 1 | 1 | ||||||||
| 2 | 2 | ||||||||
| 3 | 3 | ||||||||
| .. | .. | ||||||||
| 12 | 15 | 15 | |||||||
| Table 11: Del mapping table |
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- An end device answers RXTimingSetupReq with RXTimingSetupAns with no payload.
- The RXTimingSetupAns command should be added in the FOpt field of all uplinks until a
- class A downlink is received by the end-device. This guarantees that even in presence of
- uplink packet loss, the network is always aware of the downlink parameters used by the end-
- device.
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