PPT Slide

Frame Structure

AIS 2

AIS 1

60 Seconds

2250 Slots

1 Slot = 256 Bits

26.67 ms

TDMA. Compare Pure ALOHA with Slotted ALOHA.

2 channels give 4500 slots.

A position report fits into 1 slot.

Provisions for propagation delay.

Addressing within the frame is generally relative.

Possible to cross slot boundaries.

GPP01090-5-TN