5.5.
Signal to Interference-Noise Ratio (SINR)
SINR can be defined as,
𝑆𝐼𝑁𝑅 =
𝑆
𝐼 + 𝑁 𝑖𝑛 𝑑𝐵
(5.2)
Where S is the average received signal power, I is the interference and N is the noise. I
can further be broken down into
𝐼 = 𝐼
𝑠𝑤𝑠
+ 𝐼
𝑠𝑠ℎ𝑟𝑟
(5.3)
where I
own
is the own cell interference while I
other
is the other cell interference. [21]
SINR is one of the most important factors that determine the downlink throughput for
the UE. Per UE SINR is highly impacted by power control mechanism. Figure 5.1
shows the CDF plot of average SINR per user. With the Open Loop Power Control
(OLPC) implemented, the transmit power is varied by the path loss and the PRB usage.
A macro 1 is propagation model simulation scenario with assumption that frequency is
2 GHz, inter-site distance 500 m, bandwidth 10 MHz, UE speed at 3 km/hr and penetra-
tion loss at 20 dB. [22] The SINR per user S is given as:
𝑆 = 𝑃 − 𝐿 − 𝐼
𝑠
𝑇 − 𝑁 [𝑑𝐵]
(5.4)
and the transmit power P can be written as,
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