User Manual

Power management
99-137719-D Confidential - For internal use 11-13
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Terminal support
The following figure illustrates an example of an SDM sleep scenario. The RM (mainly
the IAI2- and UMTS protocol) is inactive in 58 frames (each 80 ms), then the receiver is
started up with a ramp up of 5 frames waiting for any data in the 64th frame.
During SDM sleep a number of internal interfaces are powered down or forced into a
power saving mode.
In active mode, power save also takes place as the various entities will go into a power
saving mode when not being used e.g. when not transmitting various components in
the transmitter chain are powered down.
11.5.2 Suspend
The BGAN XL Radio Module offers support functionality for short-term power outage
(also referred to as power hold-up) so that the integrator can reduce the power
consumption for a short period of time at the expense of interruptions in the data
session.
Suspend can be enabled with MSG_SUSPEND_REQ (see section 8.5.2.8 on page 8-24)
and sys.suspend.enable (see section 6.6.11 on page 6-32)
Upon reception of a suspend request, the RM will initiate the powerdown sequence
illustrated in the left half of Figure 11-7. When the sequence has been completed the
RM will be held in the lowest possible power consumption.
Figure 11-6: SDM sleep mode sequence (example).
Note
The sleep-mode parameters used by a specific terminal may be modified by
the BGAN earth station whenever the terminal is in an ‘active’ state. So the
integrator is highly encouraged to make a design that does not anticipate a
fixed sleep mode interval (e.g. 1 frame every 64th). The integrator should
consult the latest version of the BGAN SDM to get figures for minimum and
maximum sleep mode period.
Rx ”sleeping” (58 frames)
Rx ”ramp up”
(5 frames)
Rx ”active”
(1 frame)
Sleep mode period (64 frames)
Important
MSG_SUSPEND_REQ should be used if timing is critical (e.g. power loss)
but it cannot be used together with SDM sleep.
sys.suspend.enable has a slower timing but can be used together with
SDM sleep.
Timing diagrams in this chapter are for using MSG_SUSPEND_REQ.