| Popis: |
Critical medical conditions, such as chemotherapy, post-surgery and premature birth, require continuous health monitoring. In general, it is done manually in an intensive care unit (ICU) using wired physiological medical devices (PMD) placed near the patient bed by the nursing staff. With the advent of wireless body area networks (WBAN), the vital parameters monitoring task can be automated, and the vital data of the critical patients can be monitored remotely by the professionals for timely measures in emergency conditions. The WBAN is formed using three-tier architecture. Tier-1 has ZigBee enabled sensors and personal area network coordinator to assimilate the data sent by the sensor nodes. Tier-2 has Wi-Fi as a bridge to transfer the vital data to the hospital information system located in tier-3. As both the networking techniques (ZigBee and Wi-Fi) use the same 2.4 GHz Industrial, Scientific, and Medical (ISM) band, which leads to the coexistence issue. This paper deals with the interference analysis and modeling of MAC protocols for the coexistence of ZigBee and Wi-Fi for a hospital centered wireless body area network (HCWBAN). Various network simulation models are executed for their Clear Channel Assessment (CCA) mode and total number of nodes in the model. An exhaustive investigation is done to recognize the aspects affecting the coexistence of ZigBee and Wi-Fi. In the end, results are compared with similar studies and found to be better. |
