## Appendix L  
By analyzing the literature, items which are cited in this paper [55; 56; 57; 58; 59; 60; 61; 62; 69; 70; 71; 72; 73; 74; 75; 76; 77; 78; 79; 80] and many other items and conducting tests within this research based on the LTE Advanced (4G+) mobile network, Refs. [81; 82] sampling rules have been created. At the beginning, it is necessary to define the values of RefADD, RefADU and RefDEL from equation which is used to calculate both MDUA and MDMG items. When the CTE Model is used to analyze the potential and compare two or more telecoms from one or more countries, the highest (DL/UL) or lowest (DEL) measured value of all samples can be taken for these values, and thus using standardized values, calculate the potential estimate and make a comparison between telecoms. It is also possible to use maximum or minimum theoretical values (Ref) for a certain generation of mobile networks for this use of the CTE model. When using the CTE model to assess the potential of a telecom for particular types of services, then the minimum and maximum theoretical values must be used to accurately assess the potential of telecom for specific types of services. According to the analyzed literature that was available, the values that will be used in this paper for the LTE Advanced mobile network of the analyzed telecom were found. These referent values are:  
* RefADD = 300 Mbps
* RefADU = 150 Mbps
* RefDEL = 10 ms. Prior to the final sampling needed to assess the potential of telecoms to offer services in a smart city environment, another analysis was made to obtain more precise instructions for locations, times, and sampling methods. During a few days, samples have been taken according to a certain schedule in the city:  
* on the main roads (so-called avenues and/or boulevards) signal samples were taken every 10-15 m,
* in residential areas with a large number of tall buildings (6 floors and more), samples were taken in front of, behind and between the buildings,* on the main and other squares with a distance of 10-15 m distance for taking individual signal samples,
* In front of and around large shopping malls, samples were taken with a spacing of up to 10-15 m.  
These results are not used for calculating the potential of telecoms for providing services in a smart city, but for defining specific locations and times of mobile signal sampling. The conclusions after the procedure are:  
* deviations in measurements on the main roads in the city were very small and the signal in all its characteristics was stable,
* mobile signal patterns around and between tall residential buildings differed significantly in all essential characteristics (DL/UL/Del)
* the samples of the mobile signal in each square, viewed separately, did not differ significantly in their main characteristics, and these differences were in a few percentages. * mobile signal patterns around large shopping malls showed some significant deviations and these patterns differed. This specifically means that not too many samples should be taken on the main roads. It is enough to take samples at the main intersections and possibly one sample between the intersections (depending on the distance between the intersections). Sampling in residential areas and around major shopping centers should be more frequent and samples should be taken at a shorter distance. Analyzing different settlements (the basis was Urban Area 4), it was concluded that the minimum number of samples was 10 per square kilometer. As this city is in the \"Urban Zone 1\", its multiplication sampling factor is 4, so 40 samples should be taken. Samples should be taken during the peak network load, i.e., in the morning (7-10 h), then in the afternoon (12-14 h) and in the evening when pre-paid users are most active, ie in the period from 21-24 h. This means that in this case 120 different samples (40 + 40 + 40) per square kilometer should be taken. This also means that 1920 sampling should be done for quality analysis of services availability in an urban area of 16 km2, which is a lot.