AT Commands Reference Manual - wireless netcontrol GmbH

Chapter 3: AT Commands Reference
Note: 1) In the TCP/IP architecture we are focusing on the TCP ability to acknowledge sent
message.
2) The purpose of the two TCP Stack Options: and , is to increase TCP
DL/UL performance over fast high RTT (round trip time) links. i.e. In order to achieve a
High Throughput over an HSDPA/HSUPA network, should be set to 63
Kbytes and to 1 (Enable). Setting these two parameters affects the next socket
session open request.
DTE
Application
Remote
user
TCP layer
IP Layer
Message (S.N. = x; length = y)
ACK(A.N. = x+y)
TCP layer
IP Layer
H24
Figure 3-6: TCP Data ACK NACK Indication Feature Overview
S.N. - Sequence Number
A.N. - Acknowledge Number
1. If IsAckIndReq equal to 0, feature is inactive, the module should report nothing regarding to
the number of bytes that were acknowledged by the remote user application.
2. If IsAckIndReq equal to 1, the module shall report to the DTE (by MIPSTAT indication),
when the TCP connection is closed, the total number of bytes that were acknowledged by the
remote user application.
When the TCP connection is closed perform the following calculation:
Total number of bytes that were acknowledged = (last accepted Acknowledge Number) -
(TCP connection initial Sequence Number).
3. If IsAckIndReq equal to 2, module shall report to the DTE (by MIPSTAT indication) every
time after receiving acknowledge from the remote user application.
When the remote user application sends acknowledge perform the following
calculation:Total number of bytes that were acknowledged so far = (last accepted
Acknowledge Number) - (TCP connection initial Sequence Number).
Note: AT+MIPCLOSE, AT+MIPUSH and AT+MIPSTAT commands are affected from the
IsAckIndReq feature status.
Note: 2 ) The purpose of these two TCP Stack Options, and , is to increase
TCP DL/UL Performance over fast high RTT (round trip time) links.
i.e. In order to achieve High Throughput over HSDPA/HSUPA Network set to
63 Kbytes and set to 1 (Enable).
April 15, 2010 H24 - AT Commands Reference Manual 3-337