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Table 1 Description of the events considered for the computation of the probability of successful transmission

From: Improvement of the LPWAN AMI backhaul’s latency thanks to reinforcement learning algorithms

Notation

Event

su

Successful uplink: there is no collision between the uplink packet and another packet. The packet has been received by the base station.

sd

Successful downlink: the end-device receives the acknowledgement

sa

Successful acknowledgement: the downlink transmission is successful, the acknowledgement is sent and does not collide with another packet.

ca

Collision after: the uplink packet has a collision with another uplink packet sent after it.

cb

Colision before: the uplink packet has a collision with an uplink packet sent before it or with an acknowledgement.

cub

Collision uplink before: the uplink packet has a collision with an uplink packet sent before it.

cd

Collision downlink: the uplink packet has a collision with an acknowledgement.

pss

Packet successfully sent: a packet is successfully sent in the interval [−T d T m T a ;−T d T m ].

pb

Packet between: there are packets between the considered packet and its acknowledgement. These packets do not collide with the considered packet or prevent the transmission of the acknowledgement.