Optimal Distribution Design for Irregular Repetition Slotted ALOHA with Multi-Packet Reception
This work addresses access capacity optimization for massive machine type communication systems, representing an incremental improvement with specific gains.
The paper tackles the problem of improving access capacity in massive machine type communication systems by deriving an optimal transmission probability distribution for irregular repetition slotted ALOHA with multi-packet reception capability K=2, achieving a significantly higher load threshold than existing benchmarks.
Associated with multi-packet reception at the access point, irregular repetition slotted ALOHA (IRSA) holds a great potential in improving the access capacity of massive machine type communication systems. Considering the time-frequency resource efficiency, K = 2 (multi-packet reception capability) may be the most suitable scheme for scenarios that allow smaller resource efficiency in exchange for greater throughput. In this paper, we analytically derive an optimal transmission probability distribution for IRSA with K = 2, which achieves a significant higher load threshold than the existing benchmark distributions. In addition, the energy efficiency optimization in terms of the maximum repetition rate is also presented.