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Link-stats: use RSSI to initialize ETX by default

This commit is contained in:
Simon Duquennoy 2017-06-27 10:59:17 +02:00
parent c297c89f8d
commit f25b76bd43
1 changed files with 11 additions and 11 deletions
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22
core/net/link-stats.c
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@ -45,7 +45,7 @@
#endif
/* Half time for the freshness counter, in minutes */
#define FRESHNESS_HALF_LIFE 20
#define FRESHNESS_HALF_LIFE 15
/* Statistics are fresh if the freshness counter is FRESHNESS_TARGET or more */
#define FRESHNESS_TARGET 4
/* Maximum value for the freshness counter */
@ -55,15 +55,15 @@
/* EWMA (exponential moving average) used to maintain statistics over time */
#define EWMA_SCALE 100
#define EWMA_ALPHA 15
#define EWMA_BOOTSTRAP_ALPHA 30
#define EWMA_ALPHA 10
#define EWMA_BOOTSTRAP_ALPHA 25
/* ETX fixed point divisor. 128 is the value used by RPL (RFC 6551 and RFC 6719) */
#define ETX_DIVISOR LINK_STATS_ETX_DIVISOR
/* Number of Tx used to update the ETX EWMA in case of no-ACK */
#define ETX_NOACK_PENALTY 10
#define ETX_NOACK_PENALTY 24
/* Initial ETX value */
#define ETX_INIT 2
#define ETX_DEFAULT 2
/* Per-neighbor link statistics table */
NBR_TABLE(struct link_stats, link_stats);
@ -71,14 +71,14 @@ NBR_TABLE(struct link_stats, link_stats);
/* Called every FRESHNESS_HALF_LIFE minutes */
struct ctimer periodic_timer;
/* Used to initialize ETX before any transmission occurs. In order to
* infer the initial ETX from the RSSI of previously received packets, use: */
/* #define LINK_STATS_CONF_INIT_ETX(stats) guess_etx_from_rssi(stats) */
/* Used to initialize ETX before any transmission occurs. By default,
* infer the initial ETX from the RSSI of previously received packets.
* To use a statuc value of e.g. ETX_DEFAULT, use:
* #define LINK_STATS_CONF_INIT_ETX(stats) (ETX_DEFAULT * ETX_DIVISOR) */
#ifdef LINK_STATS_CONF_INIT_ETX
#define LINK_STATS_INIT_ETX(stats) LINK_STATS_CONF_INIT_ETX(stats)
#else /* LINK_STATS_INIT_ETX */
#define LINK_STATS_INIT_ETX(stats) (ETX_INIT * ETX_DIVISOR)
#define LINK_STATS_INIT_ETX(stats) guess_etx_from_rssi(stats)
#endif /* LINK_STATS_INIT_ETX */
/*---------------------------------------------------------------------------*/
@ -103,7 +103,7 @@ guess_etx_from_rssi(const struct link_stats *stats)
{
if(stats != NULL) {
if(stats->rssi == 0) {
return ETX_INIT * ETX_DIVISOR;
return ETX_DEFAULT * ETX_DIVISOR;
} else {
/* A rough estimate of PRR from RSSI, as a linear function where:
* RSSI >= -60 results in PRR of 1