## 2 Use Case (UC) Description, IOP Methodology and Concept Applied
### BAP and BAIOP Creation
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**BAP ID** & **Use Case ID** & **Standard** & **Interaction Link between Actors** & **Interoperability Layer** \\ \hline I1a & SMT1 & EN 62056 & LNAP-NNAP & Information \\ C1a & SMT1 & ITU-T G.9903 & LNAP-NNAP & Communication \\ C1b & SMT1 & ITU-T G.9904 & LNAP-NNAP & Communication \\ C1c & SMT1 & ITU-T G.9902 & LNAP-NNAP & Communication \\ C1d & SMT1 & ITU-T G.9901 & LNAP-NNAP & Communication \\ C1e & SMT1 & IEEE 1901.2 & LNAP-NNAP & Communication \\ C1f & SMT1 & ITU-T G.9959 & LNAP-NNAP & Communication \\ C1g & SMT1 & IEEE 802.15.4 & LNAP-NNAP & Communication \\ C1h & SMT1 & IEC 61334 & LNAP-NNAP & Communication \\ C1i & SMT1 & EN 13757 & LNAP-NNAP & Communication \\ C1j & SMT1 & ETSI TR 103 908 & LNAP-NNAP & Communication \\ C1k & SMT1 & CLC TS 50568-4 & LNAP-NNAP & Communication \\ C1l & SMT1 & EN 14908 & LNAP-NNAP & Communication \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Possible Basic Application Profiles (BAPs) for the equipment under test, based on [18]. \begin{table}
\begin{tabular}{l l} \hline \hline
**Test Case ID** & **TSMT1** \\ \hline
**BAIOP ID/UC ID** & CU1/SMT1 \\
**Interoperability Layer** & Communication \\
**Summary of the Test** & The smart meter should interact correctly with the data concentrator. The smart meter \\  & should be recognised by the data concentrator and communication should be established. \\
**Test Purpose** & To test the correct interaction between the smart meter and the data concentrator. \\
**Test Description** & The EUT has connected loads, which function normally, so, energy is flowing \\
**Step1** & The data concentrator is set to accept packets from the smart meter; the EUT is configured \\  & to accept data from the data concentrator. For this purpose, the MAC and/or IP addresses \\
**Step 2** & of the two devices are required as well as suitable authorisation (passwords) to enable the parameters setup. \\  & Test verdict \\  & PAS: in case the smart meter is recognised by the data concentrator; the communication \\
**Step 3** & between the two devices is established. \\  & FAIL: if the smart meter is not recognised by the data concentrator; the communication is not established. \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Basic Application Interoperability Profiles (BAIOPs) for the communication layer, based on [18]. It is considered that all smart meters can communicate efficiently with the data concentrator and that the latter can control and supervise the smart meters. Therefore, the interoperability tests under non-stress conditions: one smart meter communicating with one data concentrator, give a PASS as an outcome. This allows us to move on with the Interoperability Testing Methodology steps to the design of experiments, where the effect on the system performance is examined with the alteration of two parameters. In this work, apart from the theoretical explanation, an example of experimental results is given with a small-scale AMI system. The impact of the smart meter message exchange parameters on the overall system performance is examined. Our testbed consists of one data concentrator and 12 residential smart meters. The technology used for communication is the PRIME specification. The design of experiments, presented in the following section, determines how to alter the parameters to evaluate interoperability, namely the number of smart meters and the sampling period of requests to evaluate the limitations of our system.