Communication networks are used to effectively manage and control building facilities. Using a wireless channel in building automation systems would result in several advantages, including reduced installation cost and eased placement constraints on the transceivers, as well as the introduction of flexible extensions and mobile device connectivity. Recently, ZigBee was adopted as a BACnet wireless channel by both BACnet and ZigBee organizations. This paper proposes an efficient energy management scheme for the lighting system of buildings using the BACnet-ZigBee gateway and ZigBee CBA profile-based wireless sensor, controller and actuator nodes. The proposed energy management schemes were examined using an experimental facility of a distributed lighting control system. This study can be extended to the development of a BACnet-ZigBee-based smart grid system in buildings.

In this paper, we focus on a scheme that supports mobility for IPv6 over Low power Wireless Personal Area Network (6LoWPAN) sensor nodes. We define a protocol for 6LoWPAN mobile sensor node, named 6LoMSN, based on Proxy Mobile IPv6 (PMIPv6). The conventional PMIPv6 standard supports only single-hop networks and cannot be applied to multihop-based 6LoWPAN. It does not support the mobility of 6LoMSNs and 6LoWPAN gateways, named 6LoGW, cannot detect the PAN attachment of the 6LoMSN. Therefore, we define the movement notification of a 6LoMSN in order to support its mobility in multihop-based 6LoWPAN environments. The attachment of 6LoMSNs reduces signaling costs over the wireless link by using router solicitation (RS) and router advertisement (RA) messages. Performance results show that our proposed scheme can minimize the total signaling costs and handoff latency. Additionally, we present the design and implementation of the 6LoMSN mobility based on PMIPv6 for a healthcare system. According to the experimental results, the 6LoMSN of the proposed PMIPv6-based 6LoWPAN can be expected to use more of the battery lifetime. We also verify that the 6LoMSN can maintain connectivity, even though it has the freedom of being able to move between PANs without a mobility protocol stack.