Windows CE's TCP/IP stack enhancement on wireless network (203085)

MORE INFORMATION

To improve Transmission Control Protocol/Internet Protocol (TCP/IP) networking performance on a wireless network, the following TCP/IP parameters may need to be tuned to the characteristics of the supporting network. Typical wireless network has high-delay and low-bandwidth characteristics.

The registry parameters are maintained on a per-network-adapter basis rather than a system-global basis:

HKEY_LOCAL_MACHINE\<Adapter Name> \tcpip \params

TcpWindowSize

Sets recv window size; must be less than GlobalMaxTcpWindowSize; available in Windows CE version 2.1.

TcpInitialRTT

Sets initial round trip time (RTT) in milliseconds; default is 3000 milliseconds; it previously was a global parameter and was not exposed.

TcpDelAckTicks

Delayed Ack timer in milliseconds; it previously was a global hard-coded parameter; defaults to 200 milliseconds TCP/IP.

Initial congestion window is set to twice the Max Segment Size (MSS).

Fast retransmissions are supported; it triggers on every third Ack; Point-to-Point Protocol (PPP) and serial line Internet protocol (SLIP) are supported.

Windows CE 2.1 adds the ability to request additional Dynamic Host Configuration Protocol (DHCP) options from the server; replies are stored in the registry.

REFERENCES

For more information about the configurable registry settings in Windows CE .NET 4.2, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcetcpip/html/cmconparametersconfigurableusingregistryeditor.asp