User Manual

Boomer II User Manual & Integrator’s Guide
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Application Development
BM210012WT09 83 Wavenet Technology
To keep the wireless modem card from disconnecting from the network
(and turn off its radio) following an undeliverable outbound message,
disable the host inactivity timeout by issuing an
S_INACTIVITY_TIMEOUT command to the wireless modem card.
Set the timeout value to 255 (the default).
On/Off upon User Demand
To extend battery life, design the application to switch the modem on
and off as the usage need arises. This method is especially effective for
session-based, user-initiated applications.
Radio On/Off on Application Command
The radio is the primary power-consuming component in the wireless
modem card. Use S_RX_CONTROL for very effective control of
session-based, user-initiated applications.
Battery Life Considerations
In addition to specific power management options, some application
design decisions greatly affect battery life, as follows:
User traffic, amount and frequency
Commercially available compression techniques can significantly
reduce traffic volume, which improves device battery life and reduces
network usage costs. PowerSave mode batches outbound traffic at a
periodicity equal to the network-defined PowerSave protocol frame
size.
Data compression
Improve battery life by reducing and compressing the broad-cast
application data. Network usage costs can also be significantly reduced
as a result.
PowerSave Protocol
The following points describe unique operational characteristics of
devices that are compliant with the PowerSave protocol when
operating on a network, as compared to those that are not. Specific
PowerSave timing parameters can vary by network, based on how the
network operator sets up PowerSave protocol parameters.
Under PowerSave protocol, unsolicited outbound traffic to a non-
awake device is delayed. The worst case delay until the first transmit
opportunity is 128 seconds under DataTAC 4000 networks and 64
seconds under DataTAC 5000 networks. The average delay until the
next delivery opportunity is one half of the worst case time, given the
current network and device configuration.
In DataTAC 4000 systems, initial unsolicited outbound transmission
attempts are actually “ping” messages used to locate the device.