A new contention based broadcast multiaccess protocol called Announced Retransmission Random Access (ARRA) is introduced and analyzed in this paper. The proposed class of protocols increases the capacity of a slotted random access channel by requiring users to announce the intended location of their potential etransmission slot (to be used in the event of a collision) over a low rate announcement subchannel, so that conflicts between new and retransmitted messages can be prevented. The proposed protocols provide capacities in the range of 0.5 to 0.6, as compared with 0.37 for Slotted ALOHA and 0.4-0.5 for the more efficient Tree algorithm based collision resolution algorithms (CRAs). In addition, because of delay considerations, the proposed ARRA protocols are better suited to satellite channels than Tree algorithm CRAs.
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