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An Adaptive Coexistence Mechanism between WLAN and WBAN in Wireless Medical Environments

Title
An Adaptive Coexistence Mechanism between WLAN and WBAN in Wireless Medical Environments
Translated Title
무선 의료 환경을 위한 WLAN 과 WBAN 의 적응 공존 기법
Authors
Yoon, Sol
DGIST Authors
Yoon, Sol; Park, Kyung Joon; Lee, Sung Bae
Advisor(s)
Park, Kyung Joon
Co-Advisor(s)
Lee, Sung Bae
Issue Date
2013
Available Date
2016-05-18
Degree Date
2013. 8
Type
Thesis
Keywords
Wireless Local Area Network (WLAN)Wireless Body Area Network (WBAN)CoexistenceE-healthCSMA공존성무선랜무선 신체 영역 네트워크
Abstract
Electronic health (E-Health) is being recognized as a method to improve the overall health status of the population. For this reason, medical wireless communication technology has been actively studied to realize E-health. Unlike wired communication, the use of wireless communication remains to provide ubiquitous connectivity; it allows better access and enables greater physical mobility to patients. Among the various wireless technologies, WLAN (IEEE802.11/WiFi) and WBAN (IEEE 802.15.4/ZigBee) are widely used for e-healthcare system. However, interoperability and coexistence between these two heterogeneous networks are becoming key issues. ZigBee is potentially vulnerable to interference by WiFi in the same unlicensed ISM band. Most of all, the significantly different power level and asynchronous time slots result in significant unfairness between WLAN and WBAN. In this thesis, we focus on the coexistence environment beween WLAN and WBAN for e-healthcare systems in the ISM band. We propose an adaptive coexistence CSMA mechanism which can mitigate interference and achieve efficiency channel sharing. By using an efficient throughput model, we control and find an appropriate adaptive contention window size of WLAN in order to give transmission opportunities to WBAN. This proposal can guarantee the required medical-grade QoS of WBAN without any significant degradation of the throughput of WLAN. The simulation results using MATLAB confirm that the proposed algorithm operate to make efficient channel sharing compare with conventional approach. As a result, the proposed coexistence CSMA protocol guarantee reliable healthcare system and provide better QoS of WLAN and WBAN in medical environments. ⓒ 2013 DGIST
Table Of Contents
I. INTRODUCTION 1-- II. RELATED WORK 4-- 2.1 Collision of ZigBee and WiFi 4-- 2.2 Existing Coexistence Mechanisms 5-- III. BACKGROUND 7-- 3.1 Wireless Networking in Healthcare 7-- 3.2 IEEE 802.11 WLAN 9-- 3.2.1 Physical Layer 9-- 3.2.2 MAC Layer 11-- 3.3 IEEE 802.15.4 for WBAN 13-- 3.3.1 Physical Layer 14-- 3.3.2 MAC Layer 15-- IV. PROBLEM STATEMENT 17-- 4.1 Critical Data Transmission Issue in WBAN 18-- 4.2 Asymmetry of Carrier Sensing 18-- 4.3 Collision due to Different Response Time 20-- 4.4 Preliminary Simulation 21-- V. PROPOSED ALGORITHM 25-- 5.1 Throughput Model per System 25-- 5.2 Optimal Contention Window Size 28-- VI. SIMULATION 31-- VII. CONCLUSION 37-- REFERENCES 39
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002262504
http://hdl.handle.net/20.500.11750/1339
DOI
10.22677/thesis.2262504
Degree
Master
Department
Information and Communication Engineering
University
DGIST
Files:
Collection:
Information and Communication EngineeringThesesMaster


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