Slotted ALOHA with power assigning and immediate transmission controls

Presents a new access control scheme for the wireless communication packet networks of variable packet length environment, s-ALOHA/PAIT (slotted ALOHA with power assigning and immediate transmission controls). The scheme improves channel throughput in two aspects, capture effect and reuse of vacant period of a slot. For reuse of vacant period of a slot, a packet can be transmitted immediately unless it overrides the slot boundary even though the timing is not at the beginning of the slot. It enables more than one packet to be transmitted successfully in a slot. Transmission power is varied to lead capture effect among packets transmitted at the beginning of a slot and also between a packet at the beginning of a slot and one transmitted in the middle of the same slot. The authors evaluate the performance of s-ALOHA/PAIT compared with the conventional s-ALOHA and show that s-ALOHA/PAIT obtains considerable improvement of the throughput performance