Cedric Roux
d262d152ec
The necessity of SOstart/SOend was understood after email exchanges with David Breaux <davidbreaux67@gmail.com>. See openair2/LAYER2/rlc_v2/tests/test46.h for some details. Basically if we NACK without SOstart/SOend then the other end of the RLC channel will consider all the bytes as NACKed and will have to resend them all. If another status is then reported before all the bytes are sent, and because we don't use SOstart/SOend this status will NACK all the bytes again, then all the bytes are to be sent again. And the cycle repeats. It will end with a max retx reached (which triggers RLF, Radio Link Failure). The function put_bit in openair2/LAYER2/rlc_v2/rlc_pdu.c has been changed too, maybe introducing some performance issues.
16 lines
578 B
Plaintext
16 lines
578 B
Plaintext
RLC AM
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- 36.322 5.4 Re-establishment procedure
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when possible, reassemble RLC SDUs from any byte segments of AMD PDUs
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with SN < VR(MR) in the receiving side, remove RLC headers when doing
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so and deliver all reassembled RLC SDUs to upper layer in ascending order
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of the RLC SN, if not delivered before;
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- 36.322 5.2.3 Status reporting
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delay triggering the STATUS report until x < VR(MS) or x >= VR(MR)
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- 36.322 5.1.3.2.3 Actions when a RLC data PDU is placed in the reception
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buffer
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[...] and in-sequence byte segments of the AMD PDU with SN = VR(R) [...]
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