LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
176
User Manual 1173.9628.02 ─ 16
For details about the meaning of the individual redundancy versions, see "redundancy
version number" in 3GPP TS 36.212.
Remote command:
2.4.12.4
Connected DRX Connection Settings
This section describes settings for Discontinuous Reception (DRX) of the UE during an
established connection. If DRX is enabled, the UE monitors the PDCCH discontinu-
ously and thus reduces battery consumption. The related signaling parameters are
configurable and specified in 3GPP TS 36.321, section 5.7.
There are two types of DRX cycles. Long DRX cycles are mandatory while short DRX
cycles are optional. Both types have a fixed length and start with a fixed "On" time dur-
ing which the UE receiver is active. After the "On" time there is an opportunity for DRX.
The following figure shows a typical example including short and long DRX cycles. The
example starts with reception of a PDCCH during a long DRX cycle "On" time of two
subframes. Due to this reception, the inactivity timer set to 40 subframes is started and
the receiver stays on until the timer expires. In this example no further PDCCH is
received, so that the timer is not restarted.
After the timer is expired, four short DRX cycles are executed (short DRX cycle = 10
subframes, short cycle timer = 4 cycles). Finally, long DRX cycles are executed (long
DRX cycle = 20 subframes).
Fig. 2-76: Example, short and long cycles after inactivity
Active MAC padding and uplink RB allocation cause PDCCH traffic and prevent DRX,
see also
The following settings are available (option R&S CMW-KS510 is required).
GUI Reference
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