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Adjusted CSMA parameters and P-curve. Added dynamic CSMA slot time.

This commit is contained in:
Mark Qvist 2024-10-10 23:26:12 +02:00
parent 8639765679
commit 2ede362cb3
3 changed files with 10 additions and 6 deletions
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8
Config.h
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@ -20,7 +20,7 @@
#define CONFIG_H
#define MAJ_VERS 0x01
#define MIN_VERS 0x4d
#define MIN_VERS 0x4e
#define MODE_HOST 0x11
#define MODE_TNC 0x12
@ -74,9 +74,11 @@
#define LORA_PREAMBLE_SYMBOLS_MIN 18
#define LORA_PREAMBLE_TARGET_MS 15
#define LORA_CAD_SYMBOLS 3
#define CSMA_SLOT_MAX_MS 100
#define CSMA_SLOT_MIN_MS 24
int csma_slot_ms = 50;
float csma_p_min = 0.08;
float csma_p_max = 0.75;
float csma_p_min = 0.15;
float csma_p_max = 0.333;
float csma_b_speed = 0.15;
uint8_t csma_p = 85;

4
RNode_Firmware.ino
View File

@ -1298,10 +1298,10 @@ void validate_status() {
#if MCU_VARIANT == MCU_ESP32 || MCU_VARIANT == MCU_NRF52
#define _e 2.71828183
#define _S 10.0
#define _S 12.5
float csma_slope(float u) { return (pow(_e,_S*u-_S/2.0))/(pow(_e,_S*u-_S/2.0)+1.0); }
void update_csma_p() {
csma_p = (uint8_t)((1.0-(csma_p_min+(csma_p_max-csma_p_min)*csma_slope(airtime)))*255.0);
csma_p = (uint8_t)((1.0-(csma_p_min+(csma_p_max-csma_p_min)*csma_slope(airtime+csma_b_speed)))*255.0);
}
#endif

4
Utilities.h
View File

@ -1047,7 +1047,9 @@ void updateBitrate() {
lora_symbol_time_ms = (1.0/lora_symbol_rate)*1000.0;
lora_bitrate = (uint32_t)(lora_sf * ( (4.0/(float)lora_cr) / ((float)(pow(2, lora_sf))/((float)lora_bw/1000.0)) ) * 1000.0);
lora_us_per_byte = 1000000.0/((float)lora_bitrate/8.0);
// csma_slot_ms = lora_symbol_time_ms*10;
csma_slot_ms = lora_symbol_time_ms*12;
if (csma_slot_ms > CSMA_SLOT_MAX_MS) { csma_slot_ms = CSMA_SLOT_MAX_MS; }
if (csma_slot_ms < CSMA_SLOT_MIN_MS) { csma_slot_ms = CSMA_SLOT_MIN_MS; }
float target_preamble_symbols = (LORA_PREAMBLE_TARGET_MS/lora_symbol_time_ms)-LORA_PREAMBLE_SYMBOLS_HW;
if (target_preamble_symbols < LORA_PREAMBLE_SYMBOLS_MIN) {
target_preamble_symbols = LORA_PREAMBLE_SYMBOLS_MIN;