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| We would like to implement a handover layer such that an application can
control when handover decisions are made based on device's local and server
based parameters.
We ran a few experiments with a) Windows Media Player 9.0 on Windows Pocket
PC 2003 on HP IPAQ h6315 with GPRS b) Windows Media Player 10.0 on Windows
Mobile 5.0 PPC phone edition on Sprint Phone PPC 6700 with EVDO.
Following are few questions based on our observations in behavior of
both Pocket PC 2003 and Windows Mobile 5.0 PPC:
- A Live video stream using GPRS or EVDO, transitions over to WiFi
automatically if the device comes in the vicinity of WiFi network. We do not
want automatic handover behavior to happen and want to control handover from
user plane. Can this be done?
- The reverse scenario of playing a live video stream first using WiFi and
going into cellular network, breaks the live stream. We would want to auto
detect when the stream in WiFi is going to break and initiate a GPRS/EVDO
connection ahead of time and transition over to GPRS/EVDO only when we think
all parameters match user application requirement. How can this be achieved?
- How do we get information regarding signal strength from WiFi, CDMA and
GPRS modems at user plane?
- Can we keep both Cellular and WiFi connections alive at the same time and
dynamically bind TCP/IP to one of them as necessary?
- Can all of the above be done using code in user plane alone or do we have
to do kernel programming including protocol driver, intermediate driver work?
- Even if we have to do kernel work, will it work with all PDA phones in the
market or is the behavior dependant on cellular and WiFi chipsets?
- Can we issue ATDT commands directly into cellular modem to get other
information about cellular network?
Any help in this direction would be really appreciated.
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