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.
28 lines
638 B
C
28 lines
638 B
C
/*
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* am: test function segment_nack_size, case "if (count == 0) return 12;"
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* The eNB sends 5 PDUs, only first and last received by the UE. Then we
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* ask for the UE's buffer status to trigger the case.
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*/
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TIME, 1,
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ENB_AM, 100000, 100000, 35, 0, 45, -1, -1, 4,
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UE_AM, 100000, 100000, 35, 0, 45, -1, -1, 4,
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ENB_RECV_FAILS, 1,
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ENB_PDU_SIZE, 100,
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UE_PDU_SIZE, 100,
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TIME, 2,
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ENB_SDU, 0, 10,
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TIME, 3,
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UE_RECV_FAILS, 1,
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ENB_SDU, 1, 10,
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TIME, 4,
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ENB_SDU, 2, 10,
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TIME, 5,
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ENB_SDU, 3, 10,
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TIME, 6,
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UE_RECV_FAILS, 0,
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ENB_RECV_FAILS, 0,
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ENB_SDU, 4, 10,
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TIME, 42,
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UE_BUFFER_STATUS,
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TIME, -1
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