Performance Analysis of IEEE 802.15.6 CSMA/CA Protocol for WBAN Medical Scenario through DTMC Model

Abstract

The newly drafted IEEE 802.15.6 standard for Wireless Body Area Networks (WBAN) has been concentrating on a numerous medical and non-medical applications. Such short range wireless communication standard offers ultra-low power consumption with variable data rates from few Kbps to Mbps in, on or around the proximity of the human body. In this paper, the performance analysis of carrier sense multiple access with collision avoidance (CSMA/CA) scheme based on IEEE 802.15.6 standard in terms of throughput, reliability, clear channel assessment (CCA) failure probability, packet drop probability, and end-to-end delay has been presented. We have developed a discrete-time Markov chain (DTMC) to significantly evaluate the performances of IEEE 802.15.6 CSMA/CA under non-ideal channel condition having saturated traffic condition including node wait time and service time. We also visualize that, as soon as the payload length increases the CCA failure probability increases, which results in lower node's reliability. Also, we have calculated the end-to-end delay in order to prioritize the node wait time cause by backoff and retransmission. The user priority (UP) wise DTMC analysis has been performed to show the importance of the standard especially for medical scenario.

Effects Investigation of MAC and PHY Layer Parameters on the Performance of IEEE 802.15.6 CSMA/CA

“…By substituting Eq. (11) in Eq. ( 12), the stationary probability of empty state can be obtained in terms of 𝑏 𝑖,0,0 state, i.e.,…”

“…The effects of channel condition, packet size and data rate on the performance metrics are also presented. In[11], user priority wise DTMC analysis was performed to evaluate the performance of slotted CSMA/CA in IEEE 802.15.6 standard for noisy channel and situation traffic condition. However, slotted CSMA/CA mechanism is not specified in IEEE 802.15.6 standard.…”

Algoritmo DTN com Controle de Energia Aplicado em Redes de Sensores Corporais Sem-Fio

“…Como a potência de transmissão utilizada em redes corporais sem-fio costuma ser baixa, da ordem de -10dBm [10], pequenos movimentos corporais podem causar desconexões entre os nós sensores, e consequente perda de pacotes. Logo, neste trabalho, investigamos o impacto da movimentação de pacientes monitorados por nós sensores corporais na comunicação de dados.…”

Chaveamento de Transmissão Baseado na Temperatura do Nó em Redes de Sensores Corporais Sem Fio

“…Neste trabalho, os nós sensores medem dados biométricos de pacientes, tais como eletrocardiograma [2], batimentos cardíacos ou saturação de oxigênio no sangue. Esse tipo de RSSFé conhecido como Redes de Sensores Corporais Sem Fio (do inglês, Wireless Body Area Network-WBAN) [3].…”

“…Os nós sensores de uma WBAN podem estar dispostos sobre a pele ou implantados sob a pele do paciente. Por mais que a potência de transmissão desses nós seja baixa, da ordem de -10dBm [3], eles esquentam e podem causar problemas, já que estão em contato direto com a pele. Desse modo, a temperatura do nó sensor passa a ser um parâmetro importante, quando ele está se comunicando [4].…”