We only measured audio streaming over LTE but the results
give indications of what the results would be for video
streaming cases as well. The results in Figure 7 show that
traffic shaping can save some energy even when cDRX is
disabled. However, when shaping the traffic through the
proxy, we can save almost up to 60% of energy in the best
case when cDRX is enabled. Moreover, we note that enabling
cDRX does not help at all when streaming directly
from the server.
The figure shows also that when DRX is enabled, even
larger savings can be obtained by increasing the inactivity
timer value from 10s to 20s. The reason is the following.
When the inactivity timer value is 10s, the LTE protocol
transitions from Connected to Idle state in between receiving
the bursts because the timer is shorter than the burst