## Appendix E Quality of the switching system, QoSS,
**Quality of Self-care portal(s) for users, QoS\({}_{\text{SCP}}\)**  
\[QoS_{SCP}=\left(\frac{RefT_{NC}\cdot F_{TM}}{MaxT_{TM}}+\frac{RefT_{EC}\cdot F_{ EC}}{MaxT_{EC}}+\frac{RefT_{Rep}\cdot F_{ET}}{MaxT_{ET}}+\frac{RefT_{bathInf} \cdot F_{bathInf}}{MaxT_{T_{bathInf}}}+\frac{RefT_{Adv}\cdot F_{Adv}}{MaxT_{Adv}} \right)\cdot 0.1\]  
where:  
* QoS\({}_{\text{SCP}}\)--The Quality of Self-care portal(s) for users,
* NC--New Contracts,
* EC--Existing Contracts,
* Rep--Reports,
* TehInf--Technical Information,
* Adv--Advertising,
* RefT\({}_{\text{x}}\)--Reference estimated time to obtain feedback,
* MaxT\({}_{\text{x}}\)--Maximum time to obtain feedback from telecom's self-care portal(s),
* F\({}_{\text{x}}\)--A factor that defines the importance of obtaining certain information for user,
* Sum\({}_{\text{x}}\)(F\({}_{\text{x}}\)) = 1. **Quality of transmission system technologies, QoS\({}_{\text{TS}}\),**  
\[QoS_{TS}=\left(\frac{SuccCalls_{Peak}\cdot F_{Calls}}{AllInCalls_{Peak}}+ \frac{SuccRTVid_{Peak}\cdot F_{RTVidoo}}{AllRTVid_{Peak}}\right)\cdot 0.1\]  
where:  
* QoS\({}_{\text{TS}}\)--Quality of transmission system technologies,
* SuccCalls\({}_{\text{Peak}}\)--Successfully established and maintained calls (until the end of the duration) during peak load times,
* AllInCalls\({}_{\text{Peak}}\)--All initiated calls during peak load times,
* F\({}_{\text{Calls}}\)--A factor that describes the importance of calls in the operator's overall business,
* SuccRTVid\({}_{\text{Peak}}\)--Successfully established and maintained (to completion) video calls and live video streaming during peak load times,
* AllRTVid\({}_{\text{Peak}}\)--All video calls and live video streaming of events at peak times,
* F\({}_{\text{Video}}\)--A factor that describes the importance of direct video calls and direct video transmission for the telecom operator's business. * The difference between QoSSS and QoSTS is in defining the list of calls and RT video transmissions... in QoSTS, calls and RT Video from external servers and calls outside the switching hub must be defined. **Quality of mass IoT service offerings, QoS\({}_{\text{IoTMass}}\)**  
\[QoS\text{P}_{IoTMass}=\left(\frac{C_{\text{Plat}}\cdot F_{CapPlat}}{RefC_{ Plat}}+\frac{T_{\text{PES}}\cdot F_{PES}}{RefT_{PES}}\right)\cdot 0.1\]  
where:  
* QoS\({}_{\text{IoTMass}}\)--The quality of mass IoT service offerings,
* C\({}_{\text{Plat}}\)--Platform capacity considering the total number of telecom users,
* RefC\({}_{\text{Plat}}\)--Referent value of Platform capacity considering the total number of telecom users,* PES--Platform Expansion Speed--Platform expansion speed (timescale),
* T\({}_{\text{PES}}\)--Time of Platform capacity expansion speed for telecom operator,
* RefT\({}_{\text{PES}}\)--Referent value of Time of Platform capacity expansion speed for telecom operator,
* SP--Service Provider **Quality of B2C IoT service offerings, QoSP\({}_{\text{IoT}}\)T\({}_{\text{BEC}}\)**  
\[QoSP_{\text{IoT}}=\left(\frac{C_{\text{Plat}}\cdot F_{\text{CapPlat}}}{RefC_{ \text{Plat}}}+\frac{T_{\text{PES}}\cdot F_{\text{PES}}}{RefT_{\text{PES}}} \right)\cdot 0.1\]  
where:  
* QoSP\({}_{\text{IoT}}\)T\({}_{\text{BEC}}\)--The quality of B2C IoT service offerings
* C\({}_{\text{Plat}}\)--Platform capacity considering the total number of telecom users,
* RefC\({}_{\text{Plat}}\)--Referent value of Platform capacity considering the total number of telecom users,
* PES--Platform Expansion Speed--Platform expansion speed (timescale),
* T\({}_{\text{PES}}\)--Time of Platform capacity expansion speed for telecom operator,
* RefT\({}_{\text{PES}}\)--Referent value of Time of Platform capacity expansion speed for telecom operator,
* SP--Service Provider.