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lib,rlc_am_nr: retransmit first un-acked SDU when t-Poll_retransmit 

expires
This commit is contained in:
Pedro Alvarez 2022-03-14 17:29:17 +00:00
parent b3edced44a
commit f93d699abc
1 changed files with 26 additions and 0 deletions
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26
lib/src/rlc/rlc_am_nr.cc
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@ -1134,6 +1134,32 @@ void rlc_am_nr_tx::timer_expired(uint32_t timeout_id)
// Status Prohibit
if (poll_retransmit_timer.is_valid() && poll_retransmit_timer.id() == timeout_id) {
RlcDebug("Status prohibit timer expired after %dms", poll_retransmit_timer.duration());
/*
* - if both the transmission buffer and the retransmission buffer are empty
* (excluding transmitted RLC SDU or RLC SDU segment awaiting acknowledgements); or
* - if no new RLC SDU or RLC SDU segment can be transmitted (e.g. due to window stalling):
* - consider the RLC SDU with the highest SN among the RLC SDUs submitted to lower layer for
* retransmission; or
* - consider any RLC SDU which has not been positively acknowledged for retransmission.
* - include a poll in an AMD PDU as described in section 5.3.3.2.
*/
if ((tx_sdu_queue.is_empty() && retx_queue.empty()) || tx_window.full()) {
if (tx_window.empty()) {
// Nothing to RETX
return;
}
// Fully RETX first RLC SDU that has not been acked
if (tx_window.has_sn(st.tx_next_ack)) {
RlcError("TX window not empty, but TX_NEXT_ACK not in TX_WINDOW");
return;
}
rlc_amd_retx_nr_t& retx = retx_queue.push();
retx.sn = st.tx_next_ack;
retx.is_segment = false;
retx.so_start = 0;
retx.segment_length = tx_window[st.tx_next_ack].sdu_buf->N_bytes;
retx.current_so = 0;
}
return;
}
}