To maintain reliability of advanced metering infrastructure network in smart grid, data sent from a smart meter must reach a data concentrator unit efficiently. Parent selecting mechanism in routing protocol for low-power and lossy (RPL) is a key to maintain the reliability by balancing workload of meters in the network. In this paper, a parent selecting mechanism with three criteria including expected transmission count, residual energy, and expected transmission time is proposed to improve workload balancing and lifetime differences of all meters. A meter selects an immediate parent based on three factors. From simulation results, parents’ workload is better balanced and the lifetime of all meters in the network is depleted nearly at the same time. Moreover, a simulation with cognitive radio enabled meters, where data can be transmitted on a licensed channel opportunistically when the channel is not utilized, shows an improvement in the packet delivery ratio.
In this paper, we review packet transfer from DCU to meter by using DLMS/COSEM protocol. We descript the kind of book of DLMS/COSEM and explain the combination of DLMS/COSEM such as COSEM application process, COSEM application layer and connection manager. We show some example of packet transfer from application layer of DLMS/COSEM to data link layer and summary the size of packet of each command and response of DLSM/COSEM. Additionally, we will descript the ZigBee basic knowledge that used to physical layer of DLMS/COSEM protocol.
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