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<HTML><HEAD><TITLE>Re: [e2e] TCP over mobile networks: Are there any problems left?</TITLE>
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<DIV><FONT face=宋体 size=2>The mobility in a pico-cell based mobile networks
affect the transmission rates </FONT></DIV>
<DIV><FONT face=宋体 size=2>and quality. </FONT><FONT face=宋体 size=2>This had
proved in a PHS mobile networks.</FONT></DIV>
<DIV><FONT face=宋体 size=2>In PHS network, the terminal would not permit to move
faster than 20kilometer,</FONT></DIV>
<DIV><FONT face=宋体 size=2>and one voice channel can support 64kbps digital
transmission.</FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV><FONT face=宋体 size=2>It can be estimate that there is the
limitation due to terminal handoff in wlan</FONT><FONT face=宋体
size=2>--IEEE802.11 </FONT></DIV>
<DIV><FONT face=宋体 size=2>based network, </FONT><FONT face=宋体 size=2>especially
with more than 10M or 100M transmission rate. </FONT></DIV>
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<DIV><FONT face=宋体 size=2>But I belive, researches or technical reports are
required.</FONT></DIV>
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<DIV><FONT face=宋体 size=2>Gengyu</FONT> </DIV>
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<DIV style="FONT: 9pt 宋体">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 9pt 宋体; font-color: black"><B>From:</B>
<A title=andras.veres@ericsson.com
href="mailto:andras.veres@ericsson.com">András Veres (IJ/ETH)</A> </DIV>
<DIV style="FONT: 9pt 宋体"><B>To:</B> <A title=end2end-interest@postel.org
href="mailto:end2end-interest@postel.org">end2end-interest@postel.org</A>
</DIV>
<DIV style="FONT: 9pt 宋体"><B>Sent:</B> Thursday, February 16, 2006 12:17
AM</DIV>
<DIV style="FONT: 9pt 宋体"><B>Subject:</B> Re: [e2e] TCP over mobile networks:
Are there any problems left?</DIV>
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<P><FONT face="Courier New" size=2>Mobility: handoffs may become quite
frequent, e.g., once a minute. When the host goes between cells or APs, it has
to reconnect, which may have some bad consequences. For example, there may be
an outage time, or the available capacity in the target cell may be
drastically different from the originating cell due to different technology or
simply due to different traffic in the cells. Imagine a mobile with a download
rate of 100Mbps entering a cell with just 10Mbps free capacity. Mobility may
become also an issue in the fixed transport network, because traffic flows may
be rerouted to different paths during mobility.</FONT></P>
<P><FONT face="Courier New" size=2>Andras</FONT> </P></BLOCKQUOTE></BODY></HTML>