S7=S6P
= [.75 .25]\(\par
\begin{bmatrix}.8&.2\\
.6&.4\\
\end{bmatrix}\)
= [.75 .25]
It is visible that the probability of being in state A is not increasing
at all and for B is not decreasing at all.
This is called stationary matrix because it is stationed at P = [.75
.25] and it is not changing as it is in steady mood. Thus, this
process is called Markov process.
DRX allows an idle UE to power off the radio receiver for a predefined
period(called the DRX cycle)instead of simultaneously listening to the
radio channel.The system always transmits frames.The UE needs to be
synchronized with every frame and wake up immediately before the
transmission starts.When there are high traffic loads, there may not be
any announce of arrival of traffic in UE so that no delay can be
occurred.At a result the UE will consume extra unnecessary battery
power.The DRX is applied then the UE is not forced to wake up at every
announcement instead the UE disable the RF part to put the receiver in
sleep for specific period of time and omit some of the announcement to
reduce power consumption.When the UE wakes up then the UE needs to send
a wake up frame to the network that its RF part has been enabled again
and ready to receive frame that is distained for specific UE.To improve
user equipment (UE)battery lifetime, LTE supports Discontinuous
Reception(DRX)in both the RRC IDLE and the RRC CONNECTED radio resource
control(RRC)states.DRX allows UEs which are not receiving data from
their corresponding eNodeB (eNB)to monitor the physical downlink control
channel (PDCCH)discontinuously.When UEs are not listening to the PDCCH,
they can enter a power saving mode in which most of their circuits can
be turned off, thus reducing power consumption significantly.With DRX,
the UE only wakes up periodically to listen to the PDCCH for a while,
returning to the low power mode if no packet arrival is detected or
resuming its normal operation in the case of new packet arrivals
[10].