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--></style><div>Hi Anoop,</div><div><br></div><span id="zwchr" data-marker="__DIVIDER__">----- On Feb 18, 2017, at 1:03 AM, Anoop Singh Tomar <anooptomar@fb.com> wrote:<br></span><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><div class="WordSection1"><p class="MsoNormal"><span style="font-size: 10.5pt;" data-mce-style="font-size: 10.5pt;">Hi ,</span></p><p class="MsoNormal"><span style="font-size: 10.5pt;" data-mce-style="font-size: 10.5pt;">Posting question related to capability to
</span>implement user plane (GTP tunnel) for S1-U and Iu-PS interface between S-GW & eNB and SGSN & RNC respectively via osmocom kernel GTP-U module.
</p><p class="MsoNormal">At present it seems if TE-ID is not valid packet is dropped in kernel GTP-U module. So in order to use this for S1-U/Iu-PS interface it is required to add support for following use-case:</p><p class="MsoPlainText" style="margin-left: .75in; text-indent: -.25in; mso-list: l0 level1 lfo2;" data-mce-style="margin-left: .75in; text-indent: -.25in; mso-list: l0 level1 lfo2;"><span style="font-family: Symbol;" data-mce-style="font-family: Symbol;"><span style="mso-list: Ignore;" data-mce-style="mso-list: Ignore;">ยท<span style="font: 7.0pt 'Times New Roman';" data-mce-style="font: 7.0pt 'Times New Roman';">
</span></span></span>Down link packet arrival in S-GW /SGSN for UE which is in idle mode โ Buffer the packet and trigger paging to move the UE to connected.
</p><p class="MsoPlainText" style="margin-left: 1.0in; text-indent: -.25in; mso-list: l1 level2 lfo4;" data-mce-style="margin-left: 1.0in; text-indent: -.25in; mso-list: l1 level2 lfo4;"><span style="mso-list: Ignore;" data-mce-style="mso-list: Ignore;">a.<span style="font: 7.0pt 'Times New Roman';" data-mce-style="font: 7.0pt 'Times New Roman';">
</span></span>When UE moves to idle mode โ S1-U or IuPS bearer is released. In this case IP address and TE-ID of eNB/RNC becomes invalid.</p><p class="MsoPlainText" style="margin-left: 1.0in; text-indent: -.25in; mso-list: l1 level2 lfo4;" data-mce-style="margin-left: 1.0in; text-indent: -.25in; mso-list: l1 level2 lfo4;"><span style="mso-list: Ignore;" data-mce-style="mso-list: Ignore;">b.<span style="font: 7.0pt 'Times New Roman';" data-mce-style="font: 7.0pt 'Times New Roman';">
</span></span>DL Packet is received for the idle mode UE in S-GW/SGSN - In this case , kernel GTP-U module should deliver packet to user-space application (SGW/osmoSGSN) so that these packets can be buffered in user space and paging can be initiated.
</p><p class="MsoPlainText">Question โ Is there any plan to support above in near-future in osmocom kernel GTP-U module or larger question would be to plan to enable usage of kernel GTP-U module in SGSN and SGW towards RAN ?</p></div></blockquote><div><br></div><div>We (Travelping) have some ideas about implementing a S-GW based</div><div>on the current ergw code [1]. This would also involve implementing kernel</div><div>side support.</div><div><br data-mce-bogus="1"></div><div>The current idea for extending the kernel part is to change the PDP</div><div> context logic from a 'GTP-U to network device' reeation to a 'GTP-U</div><div> to something' relation. The 'something' then would be the existing network</div><div>device, another GTP-U socket (including TEID's), a L2TP tunnel, a IPsec</div><div> session, .... an so on. My current understanding is that the LWT infrastructure</div><div> should be suitable for that.<br></div><div><br data-mce-bogus="1"></div><div>This implementation would support the S1-U use case. For Iu-PS, a user</div><div>space only implementation would IMHO be more suitable. Anyhow, the</div><div>current kernel implementation is passing all packets that it can't handle</div><div>(has no PDP context for them) onto the user space process.</div><div><br data-mce-bogus="1"></div><div>But all that are only halve backed ideas, nothing concrete, yet.</div><div><br data-mce-bogus="1"></div><div>Regards</div><div>Andreas</div><div><br data-mce-bogus="1"></div><div>[1]: https://github.com/travelping/ergw</div><div><br></div><blockquote style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><div class="WordSection1"><p class="MsoPlainText">Anoop</p></div><br></blockquote></div></div></body></html>