Abstract
Slotted Aloha is an effective random access protocol and can also be an important element of more advanced media access protocols. This paper investigates slotted Aloha in a radio environment with multiple access points. Specifically, we examine the impact of multi-access-point (multi-AP) diversity on the performance of slotted Aloha. The paper considers both omni-directional (OM) and beamforming (BF) antennas at transmission nodes. This leads to the investigation and comparison of four different network scenarios, i.e., OM with multi-AP diversity, OM without multi-AP diversity, BF with multi-AP diversity and BF without multi-AP diversity. Performance evaluations and comparisons are presented in terms of throughput and average packet delay.
Highlights
Slotted Aloha has been extensively used in wireless environments [1,2,3,4], in which the power levels of received packets can be different due to independent fading
It is shown that a single-beam adaptive array at the receiver improves the performance of a slotted Aloha network by creating a strong capture effect [9] and a multiple receiving beam adaptive array can successfully receive two or more overlapping packets at the same time [10]
This paper investigates slotted Aloha with multi-access points (AP) diversity and it differs from previous research in the following aspects
Summary
Slotted Aloha has been extensively used in wireless environments [1,2,3,4], in which the power levels of received packets can be different due to independent fading. Besides the capture effect, beamforming (BF) techniques can potentially increase throughput since they are able to reduce collisions in slotted Aloha as compared to omni-directional (OM) antennas. While all cochannel interfering packets are discarded in [12], a model, in which multiple base stations are able to accept a packet from the same user as long as it captures the receivers, is studied in [13] through simulations. Such a scheme potentially improves the throughput of slotted Aloha as compared to the approach in [12]. This paper investigates slotted Aloha with multi-AP diversity and it differs from previous research in the following aspects.
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