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wifi: Fix starting SeqNo when ADDBA Response arrives after timeout

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This commit is contained in:
Stefano Avallone
2024-05-02 16:07:20 +02:00
committed by Stefano Avallone
parent 1f23f4ea33
commit eea2800438
1 changed files with 8 additions and 8 deletions
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16
src/wifi/model/qos-txop.cc
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@@ -664,16 +664,16 @@ QosTxop::GotAddBaResponse(const MgtAddBaResponseHeader& respHdr, Mac48Address re
if (respHdr.GetStatusCode().IsSuccess())
{
NS_LOG_DEBUG("block ack agreement established with " << recipient << " tid " << +tid);
// A (destination, TID) pair is "blocked" (i.e., no more packets are sent)
// when an Add BA Request is sent to the destination. However, when the
// Add BA Request timer expires, the (destination, TID) pair is "unblocked"
// and packets to the destination are sent again (under normal ack policy).
// Thus, there may be a packet needing to be retransmitted when the
// Add BA Response is received. In this case, the starting sequence number
// shall be set equal to the sequence number of such packet.
// A (destination, TID) pair is "blocked" (i.e., no more packets are sent) when an
// Add BA Request is sent to the destination. However, when the Add BA Request timer
// expires, the (destination, TID) pair is "unblocked" and packets to the destination are
// sent again (under normal ack policy). Thus, there may be a packet with a sequence number
// already assigned waiting to be retransmitted (or being transmitted on another link)
// when the Add BA Response is received. In this case, the starting sequence number shall
// be set equal to the sequence number of such packet.
uint16_t startingSeq = m_txMiddle->GetNextSeqNumberByTidAndAddress(tid, recipient);
auto peekedItem = m_queue->PeekByTidAndAddress(tid, recipient);
if (peekedItem && peekedItem->GetHeader().IsRetry())
if (peekedItem && peekedItem->HasSeqNoAssigned())
{
startingSeq = peekedItem->GetHeader().GetSequenceNumber();
}