High Speed Mobile Internet (HSDPA Via USB) Unusable Due To Unreliability
it seems as if (a fully up-to-date) Windows 7 has a massive problem with high-speed mobile Internet connections (3G HSDPA) via modems connected to USB ports - and I really, really need to get this fixed :-)
I have two very distinct devices which are affected:
* Nokia E71 (a modern HSDPA-capable 3G UMTS mobile phone) - self-powered, connected via USB
* (Vodafone) Huawei E172 (a dedicated 3G UMTS mobile broadband USB adapter) - system-powered (laptop), connected via USB
Symptoms:
After having successfully established an Internet connection, any amount of serious downstream load will result in
* stop of downstream TCP/IP
* the connection "hanging" (which materializes in TCP/IP disconnects due to timeouts later on)
The devices themselves show symptoms similar to a hardware-level USB disconnect - it is extremely puzzling, though, that the TCP/IP stack apparently did not receive any indication of any problems.
Trying to cleanly disconnect the TCP/IP connection via the Networking Centre (right-click -> disconnect) will result in a long wait (20-30 seconds?), with the Networking UI hanging partially during this time.
Affected system:
* Windows 7 (32bit) Enterprise
* Lenovo T61 with 4 GB of memory (up-to-date with Lenovo Windows 7 RTM drivers / software / BIOS)
Steps necessary to reproduce for me, and two additional people (those on a Lenovo T500 and Windows 7 (64bit), exact system parameters unknown):
* fresh install of Windows 7 Enterprise (32 bit)
* install latest "Nokia Ovi 2.0" software (ships with modem "drivers" - largely an INF file, I believe)
* connect Nokia E71 device
* create dial-up connection (providers tested: O2 and Vodafone in Germany)
* dial-up
* put massive downstream load onto system, e.g. multiple Youtube streams or parallel downloads via a download manager to a source which does deliver (and make sure that your network delivers as well).
[To reproduce with the Huawei E172, use the simplest steps to go online, using, e.g. Huawei's Mobile Partner software and/or a Vodafone-branded software both of which will install a USB/Serial-interface into the data card]
I cannot stress enough the importance of downstream load - please verify with sustained loads of 300 kiloBYTE/s (KB/s) for extended periods of time (say over the course of 1 GB, although 50 MB volume have sufficed so far to reliably produce the disconnects). A Nokia E61i (which has only UMTS 3G capabilities with 384 kiloBIT/s downstream) seems to do fine.
Note: In the locations I perform tests, the 3G UMTS networks deliver sustained data rates (via HSDPA) of up to effective 470 KB/s (7.2 MBit/s cells). As "serious" (as in HSDPA) UMTS coverage in Germany is common, this might have a major impact, e.g. for Windows 7 Netbooks.
Finally, please allow me to speculate that any / all *high-speed* data transfer over the USB-Serial-layer is affected by this issue. What worries me most is the misbehaviour of the Nokia E71, which is self-powered and has a "driver" that should be very low in complexity (I can only see usbser_lowerflt.sys as being owned by Nokia)
This behaviour of Windows 7 makes this a critical regression for me - a fully patched Windows XP worked flawlessly on that very hardware (laptop / BIOS / USB devices); this specific Huawei E172 additionally is known to work flawlessly on my desktop system, using a fully patched Vista installation.
Note: There are additional, independent reports of this issue on the Internet - try searching for reports on (frequent) disconnects in relationship with HSPDA / USB and Huawei / Nokia devices.
View Replies (Posted: Thursday, November 12, 2009 8:19 AM)
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