Wavenet Technology Pty Ltd. BM2900D Benutzerhandbuch
Appendix D - Application Development __________________________ Boomer II User Manual & Integrator’s Guide
Copyright Wavenet Technology © November 2003
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BM210012WT37
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.
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:
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. Power Save mode batches outbound traffic at a
periodicity equal to the network-defined Power Save protocol frame
size.
Commercially available compression techniques can significantly
reduce traffic volume, which improves device battery life and reduces
network usage costs. Power Save mode batches outbound traffic at a
periodicity equal to the network-defined Power Save 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.
Improve battery life by reducing and compressing the broad-cast
application data. Network usage costs can also be significantly reduced
as a result.
Power Save Protocol
The following points describe unique operational characteristics of
devices that are compliant with the Power Save protocol when
operating on a network, as compared to those that are not. Specific
Power Save timing parameters can vary by network, based on how the
network operator sets up Power Save protocol parameters.
Under Power Save 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.
In DataTAC 5000 systems, unsolicited outbound messages (or
messages that have missed the previous transmit opportunity) are
delivered in the “root” (that is, home) window for the recipient device.
Once the device is thus awakened, it remains awake for about n
seconds after each message or ACK transmission from the device.
During the wake time the network delivers messages to the device as it
would to a device that is non-compliant with the Power Save protocol.
(Default n = 20 seconds for DataTAC 4000 networks and 8 seconds for
DataTAC 5000 networks.)
Roaming and location update reporting to the network happens more
slowly because the Power Save protocol device takes longer to respond
to changes in the RF environment. The infrequent worst case latency in
responding to external stimuli (resulting in either a location update or
The following points describe unique operational characteristics of
devices that are compliant with the Power Save protocol when
operating on a network, as compared to those that are not. Specific
Power Save timing parameters can vary by network, based on how the
network operator sets up Power Save protocol parameters.
Under Power Save 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.
In DataTAC 5000 systems, unsolicited outbound messages (or
messages that have missed the previous transmit opportunity) are
delivered in the “root” (that is, home) window for the recipient device.
Once the device is thus awakened, it remains awake for about n
seconds after each message or ACK transmission from the device.
During the wake time the network delivers messages to the device as it
would to a device that is non-compliant with the Power Save protocol.
(Default n = 20 seconds for DataTAC 4000 networks and 8 seconds for
DataTAC 5000 networks.)
Roaming and location update reporting to the network happens more
slowly because the Power Save protocol device takes longer to respond
to changes in the RF environment. The infrequent worst case latency in
responding to external stimuli (resulting in either a location update or