User Manual

Table Of Contents
Power management
99-137719-D Confidential - For internal use 11-15
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Terminal support
11.5.3 Modem recovery
The BGAN XL Radio Module has incorporated a mechanism (when the modem is in
operating bgan) which makes the modem more tolerant to disruptions of the satellite
signal and facilitates lower power consumption. The mechanism includes 2 different
behavioural modes which can be controlled by the integrator.
1. In scenarios where the satellite signal disappears in a short period of time (up to
400 ms). This mode does not require any interaction from the Integrator as the
modem automatically detects signal blocking. When signal blocking is detected the
modem will stop any transmission in progress and continuously wait for the signal
to reappear. When the signal reappears the re-synchronization period will be within
the range from 80 ms to 320 ms depending on the specific channel conditions and
forward bearer type. The estimated power consumption in this mode is shown in
table below.
t
3
20 The typical time consumed from a MSG_SUSPEND_ABORT is
received to bring the entire modem out of suspend mode and enter
receive only state.
t
4
240 The typical time consumed to enter the full operational state.
Depending on the physical conditions on the forward channel the
time can in some scenarios be higher than 420 ms.
It takes some additional time before the RM has received
reservations from RAN and can transmit.
Note
It is not recommended to write configuration parameters to the RM while it is
in suspend mode.
RM will use extra power to handle write operations.
RM can miss configuration parameter changes if many parameters are
written in the same suspend period.
The response to protocol messages for antenna pointing (section 8.5.5 on
page 8-36) will be delayed until suspend has ended.
Name Time [ms] Description
Table 11-2: Description of suspend timing intervals
Figure 11-8: Modem re-synchronization.
FECs
UW
80 ms
FECs
UW
FECs
UW
FECs
UW
FECs
UW
UW
FECs FECs
UW
FECs
UW
FECs
UW
FECs
UW
FECs
UW
FECs
UW
FECs
UW
FECs
UW
0 .. 400 ms
Signa l lost p e rio d
80 .. 420 ms
Resynchronization period OperatingOperating