## 7 Simulation Results and Discussion  
In this study, multiple bandwidth allocations have been used to support different number of machines. In addition, we have used many transmission modes for each bandwidth to assess their impact on future MTC traffic. We have calculated the number of devices that have completed data transaction successfully within the allowed time period (400 TTI). We have also traced all these devices to calculate how much the data rate along with their wideband SINR and the amount of resource assigned per TTI. Tables 3-5 show the number of health sensors that successfully sent their payload (100 kbps) during the allowed time intervals 400 ms and for device speed of (0, 30 and 100) kmph that simulate stationary, low speed and fast-moving users in car, respectively. The figures in these tables are for the most stringent sensors demands, normally; some sensors need to transmit a very low data with very long time intervals. Such sensors are less stringent and can easily satisfy their demands with this approach. Taking into account the fact that most of the current sensors support only one antenna, to reduce their size, power consumption and increase their battery life time, Single Input Single Output (SISO) figures are the lower bound for the number of MTC devices that can be supported based on the allocated bandwidth. When MTC devices are equipped with two antennas, the BS can configure MIMO links, with diversity or Closed Loop Spatial Multiplexing (CLSM), which significantly increases the data rate. As we can see in Tables 3-5, the data throughput of MIMO figures is much higher than SISO figures for the allocated bandwidth.  
Generally, we have used 500 devices in order to check the dimension of the connectivity and weather these devices completed their data transaction in time or not. For a certain bandwidth/number of resources, the MTC devices have been added group by group in every simulation until some devices cannot have enough resources to complete data transaction (considered in outage). This is done to ensure how many MTC devices can be supported per the allocated bandwidth, where a maximum of 474 out of 500 devices have successfully completed their data transaction, as shown in Table 3--MIMO figure with 20 MHz bandwidth.  
In addition, as the user move faster, there will be considerable increase in handover rate and channel estimation time. This will decrease the data rate of MTC devices, which consequently decrease the number of MTC devices that can be simultaneously connected based on certain bandwidth. A test has been made for 80 sensors with speed of 0 kmph, 30 kmph and 100 kmph and for each speed, the simulation has been repeated to investigate the impact on the connected devices with bandwidth allocation of 5 MHz [39]. Higher mobility of devices will also increase the power consumption of the devices, Figures 7 and 8 show the energy per bit in micro joule per bit (\(\mu\)jpb) for all MTC devices including those in outage (devices that fail to make full data transaction) and for SISO and MIMO.  
be transferred and the required time for this transaction to be completed. Therefore, as depicted in Figure 9, the devices that have low requirements have completed their data transaction sooner than those devices with higher data requirements (larger ftp file size).  
Figure 8: Energy per bits in ijpb with two antennas sensors, simulation has been conducted with 80 MTC devices for 5 MHz bandwidth.  
Figure 7: Energy per bits in ijpb with single antenna sensors, simulation has been conducted with 80 MTC devices for 5 MHz bandwidth.  
Figure 9: Data transaction from 4 different MTC devices of four sensors networks with different requirements.