Abstract
A WiFi-ZigBee hybrid BAN solution, namely WiZBAN, is proposed and implemented to cater for the development of high traffic AMI for smart grid application. It is important to highlight that the major challenge of WiZBAN is to handle the high density environment which results in heavy traffic loading and weak signal propagation. To overcome the captioned problem, Vertical Backbone Communication (VBC) and Horizontal Floor Communication (HFC) are defined for WiZBAN. The WiZBAN consists of WiZBAN Gateway (WiZGW), WiZBAN Meter Hub (WiZBAN) and WiZBAN In Home Display (WiZIHD) which caters for the smart grids services including smart metering and demand response. The WiZGW is the entrance of WiZBAN and connects WiZBAN to utilities. The WiZGW also teams up with WiZMH to enables VBC. On the other hand, WiZMH serves as the interception point of VBC and HFC. It interacts with smart meters and sets up the HFC together with WiZIHD to provide the user interface for end users. To shorten the transmission time, WiFi is adopted for VBC while ZigBee is applied to HCF to overcome the weak signal propagation. To investigate the performance of WiZBAN, a case study has been conducted based on an existing 23 floor residential building. From the measured and simulated results, the average round trip delay of demand response and smart metering are found to be 0.6 s and 9 s respectively.
Highlights
Smart grid is well recognized by scientists as effectively way out of the global warming
It is important to highlight that the major challenge of WiZBAN is to handle the high density environment which results in heavy traffic loading and weak signal propagation
The WiZBAN consists of WiZBAN Gateway (WiZGW), WiZBAN Meter Hub (WiZBAN) and WiZBAN In Home Display (WiZIHD) which caters for the smart grids services including smart metering and demand response
Summary
Smart grid is well recognized by scientists as effectively way out of the global warming. The meters send the energy data to the utility backend server via the BAN GW typically every 15 - 30 minutes, such data aggregation renders traffics handled by BAN GW much heavier than HFC and such communications in the vertical backbone is referred as “Vertical Backbone Communication” (VBC). Difficulties encountered in BAN include highly shielded thick concrete wall embedded with steel bars surrounding the meter room and the lift-well typically nearby These structures prohibit signal propagation and are a strong deterrent to high speed data. HFC handles the data transmission between the IHDs and smart meters which normally has shorter communication distance and less traffic loadings but with higher difficulties in signal propagation due to complex structure of floor plan.
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