deac/osd-contiki
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Rewrote the initial link estimate logic: link estimates are now

Browse source 
computed only over the actual samples, not over the entire
buffer. Also, the initial link estimate is much more conservative now
(16 transmissions) to favor links that have been probed, and which
therefore are likely to have better ETXs.
This commit is contained in:
adamdunkels 2010-10-11 23:34:02 +00:00
parent 98702b2e85
commit 5eb4a0fe8d
1 changed files with 17 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
core/net/rime/collect-link-estimate.c
View file

@ -32,7 +32,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: collect-link-estimate.c,v 1.4 2010/10/03 20:06:25 adamdunkels Exp $
* $Id: collect-link-estimate.c,v 1.5 2010/10/11 23:34:02 adamdunkels Exp $
*/
/**
@ -51,7 +51,7 @@
collect-link-estimate.h. */
#define ETX_HISTORY_WINDOW 8
#define INITIAL_LINK_ESTIMATE 4
#define INITIAL_LINK_ESTIMATE 16
#define DEBUG 0
#if DEBUG
@ -77,7 +77,7 @@ collect_link_estimate_new(struct collect_link_estimate *le)
{
/* Start with a conservative / pessimistic estimate of link quality
for new links. */
set_all_estimates(le, INITIAL_LINK_ESTIMATE);
set_all_estimates(le, 0/*INITIAL_LINK_ESTIMATE*/);
le->historyptr = 0;
le->num_estimates = 0;
}
@ -86,13 +86,13 @@ void
collect_link_estimate_update_tx(struct collect_link_estimate *le, uint8_t tx)
{
if(tx == 0) {
printf("ERROR tx == 0\n");
/* printf("ERROR tx == 0\n");*/
return;
}
if(le != NULL) {
if(le->num_estimates == 0) {
set_all_estimates(le, tx * 2);
} else {
/* if(le->num_estimates == 0) {
set_all_estimates(le, tx);
} else*/ {
le->history[le->historyptr] = tx;
le->historyptr = (le->historyptr + 1) % ETX_HISTORY_WINDOW;
}
@ -121,14 +121,19 @@ collect_link_estimate(struct collect_link_estimate *le)
int i;
uint16_t etx;
if(le->num_estimates == 0) {
return INITIAL_LINK_ESTIMATE * COLLECT_LINK_ESTIMATE_UNIT;
}
PRINTF("collect_link_estimate: ");
etx = 0;
for(i = 0; i < ETX_HISTORY_WINDOW; ++i) {
PRINTF("%d ", le->history[i]);
etx += le->history[i];
for(i = 0; i < le->num_estimates; ++i) {
PRINTF("%d+", le->history[i]);
etx += le->history[(le->historyptr - i - 1) & (ETX_HISTORY_WINDOW - 1)];
}
PRINTF(", %d\n", (COLLECT_LINK_ESTIMATE_UNIT * etx) / ETX_HISTORY_WINDOW);
return (COLLECT_LINK_ESTIMATE_UNIT * etx) / ETX_HISTORY_WINDOW;
PRINTF("/%d = %d\n", i,
(COLLECT_LINK_ESTIMATE_UNIT * etx) / i);
return (COLLECT_LINK_ESTIMATE_UNIT * etx) / i;
}
/*---------------------------------------------------------------------------*/
int