Editing ALOHAnet (section)

=== Reservation ALOHA ===

Reservation ALOHA, or R-ALOHA, is an effort to improve the efficiency of Slotted ALOHA. The improvements with Reservation ALOHA are markedly shorter delays and ability to efficiently support higher levels of utilization. As a contrast of efficiency, simulations have shown that Reservation ALOHA exhibits less delay at 80% utilization than Slotted ALOHA at 20–36% utilization.<ref>{{cite web |url=http://www.laynetworks.com/Aloha%20Simulation%20Validation.htm |title=Aloha Simulation Validations - Computer Science - Provided by Laynetworks.com |website=www.laynetworks.com |url-status=dead |archive-url=https://web.archive.org/web/20030801201425/http://www.laynetworks.com/Aloha%20Simulation%20Validation.htm |archive-date=2003-08-01}} </ref>

The chief difference between Slotted and Reservation ALOHA is that with Slotted ALOHA, any slot is available for utilization without regards to prior usage. Under Reservation ALOHA's [[contention based protocol|contention-based]] reservation schema, the slot is temporarily considered "owned" by the station that successfully used it. Additionally, Reservation ALOHA simply stops sending data once the station has completed its transmission. As a rule, idle slots are considered available to all stations that may then implicitly reserve (utilize) the slot on a contention basis.