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Introduce contention window (CW) (#1500)

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Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
This commit is contained in:
GUVWAF
2022-06-13 15:21:18 +02:00
committed by GitHub
parent 553b35d0ad
commit a1b07ed6aa
3 changed files with 38 additions and 52 deletions
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16
src/mesh/RadioInterface.h
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@@ -52,8 +52,6 @@ class RadioInterface
CallbackObserver<RadioInterface, void *> notifyDeepSleepObserver =
CallbackObserver<RadioInterface, void *>(this, &RadioInterface::notifyDeepSleepCb);
/// Number of msecs we expect our shortest actual packet to be over the wire (used in retry timeout calcs)
uint32_t shortPacketMsec;
protected:
bool disabled = false;
@@ -61,10 +59,16 @@ class RadioInterface
float bw = 125;
uint8_t sf = 9;
uint8_t cr = 7;
/** Slottime is the minimum time to wait, consisting of:
- CAD duration (maximum of SX126x and SX127x);
- roundtrip air propagation time (assuming max. 30km between nodes);
- Tx/Rx turnaround time (maximum of SX126x and SX127x);
- MAC processing time (measured on T-beam) */
uint32_t slotTimeMsec = 8.5 * pow(2, sf)/bw + 0.2 + 0.4 + 7;
uint16_t preambleLength = 32; // 8 is default, but we use longer to increase the amount of sleep time when receiving
const uint32_t MIN_TX_WAIT_MSEC = 100; // minimum time to wait before transmitting after sensing the channel in ms
const uint32_t PROCESSING_TIME_MSEC = 4500; // time to construct, process and construct a packet again (empirically determined)
const uint8_t CWmin = 2; // minimum CWsize
const uint8_t CWmax = 8; // maximum CWsize
MeshPacket *sendingPacket = NULL; // The packet we are currently sending
uint32_t lastTxStart = 0L;
@@ -128,10 +132,10 @@ class RadioInterface
/** The delay to use for retransmitting dropped packets */
uint32_t getRetransmissionMsec(const MeshPacket *p);
/** The delay to use when we want to send something but the ether is busy */
/** The delay to use when we want to send something */
uint32_t getTxDelayMsec();
/** The delay to use when we want to send something but the ether is busy. Use a weighted scale based on SNR */
/** The delay to use when we want to flood a message. Use a weighted scale based on SNR */
uint32_t getTxDelayMsecWeighted(float snr);