Performance analysis of packet reservation multiple access with an adaptive array

Abstract

For local wireless communications, the packet reservation multiple access (PRMA) protocol, which combines random access with time division access, has been proposed and analyzed. The study results shows that the performance of PRMA is degraded in the heavy load condition because of the contention mechanism of random access. In this paper, we propose the use of the adaptive array antenna with PRMA protocol to improve the performance. In the proposed model, the adaptive array can acquire a packet by pointing peak antenna pattern toward that packet even when a collision occurs. We evaluate the throughput performance by the theoretical analysis. We also evaluate the throughput and the packet dropping probability by the computer simulation. It is shown that the proposed model attains higher throughput and lower packet dropping probability than the conventional PRMA.

Cognitive medium access control protocols for secondary users sharing a common channel with time division multiple access primary users

“…Then, the probability P ( X s ( t ) = x s ) can be calculated by Equation or . Note that the initial state vector is [1,0,0, … ,0] .…”

“…A Markov chain for evaluating the distribution of P.X s .t/ D x s / (c s Ä m s and c s m s ).Note that the initial state vector is OE1; 0; 0; : : : ; 0[23,24].b.c s / D P idle c s 1 p m .1 p m / .c s 1/ .c s 1s .t / D 0/ P .X s .t / D 1/ P .X s .t / D c s / s .t / D 0/ P .X s .t / D 1/ P .X s .t / D ms / Wirel. Commun.…”

Análise de Desempenho do Protocolo Cog-PRMA sob Sensoriamento Imperfeito

“…Diversas técnicas de múltiplo acesso vêm sendo propostas, analisadas e implementadas nas redes de telecomunicações tradicionais ao longo dosúltimos 40 anos. O advento das redes multimídia levou a propostas além das clássicas, como a técnica denominada Packet Reservation Multiple Access (PRMA), cujo desempenho foi analisado em [2], [3], [4] e [5].…”

Stability of slotted ALOHA with spatial diversity

“…Most of the effort in utilizing the spatial diversity at the Media Access Control (MAC) layer has been directed either towards modifying existing protocols like ALOHA, CSMA etc. [10] - [15] or design of new MAC protocols to exploit directional antennas and smart adaptive antenna arrays [16]- [20]. In systems with spatial diversity, the main issues that need to be addressed are the design of signal processing techniques for the multiple antenna receiver at the physical layer and keeping buffers of packets on the transmitter side under control at the MAC layer.…”