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Harald Welte laforge at gnumonks.orgHi Andreas, On Tue, Nov 05, 2013 at 07:55:29AM +0100, Andreas Eversberg wrote: > there is one issue about failed downlink TBF: the PCU does not do any > retry. when the assignment is sent to the phone and it fails, there is > no retry according to the specs. i assume that this is a task for the > SGSN. osmo-sgsn/openggsn does not resend any LLC frame in case of > LLC-DISCARDED message, if i look at the source code of libosmogb. > (LLC-DISCARDED is forwarded at bssgp_rx_llc_disc() of gprs_bssgp.c, but > i don't see where it is handled.) > > what actually happens is that TCP layer will do the resend, but this is > a problem, especially at the border of coverage where many downlink > assignments get lost. I'm not sure if I'm mixing up things, but we have three potential protocol layers that can take of reliable delivery: 1) the RLC/MAC layer between PCU and MS 2) the LLC protocol 3) the TCP layer inside user IP