From 387d3f347a479895d744a0d9722f30df6ec9e86c Mon Sep 17 00:00:00 2001 From: gnawali Date: Sat, 31 Jan 2009 06:47:08 +0000 Subject: [PATCH] comments from Martin --- doc/txt/tep124.txt | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/doc/txt/tep124.txt b/doc/txt/tep124.txt index bfd198ce..45875024 100644 --- a/doc/txt/tep124.txt +++ b/doc/txt/tep124.txt @@ -54,7 +54,11 @@ statistics can later be used to make these estimates more accurate. In a node pair (A,B), with B as the node of reference, in-bound link quality is a value in the range of 0 to 255 that describes the quality of the link from A to B estimated by B by counting the successfully -received packets from A among all the packets transmitted by B. +received packets from A among all the packets transmitted by A. Thus, +in-bound link quality is the empirical probability that a packet will +be successfully received on a given link. A value of 255 represents a +probability of 1 and a value of 0 represents a probability of 0 of +successfully receiving a packet on a given link. 2.2 Out-bound Link Quality -------------------------------------------------------------------- @@ -65,16 +69,19 @@ determine the out-bound link quality if A advertises its in-bound link qualities. LEEP is the protocol that is used to exchange the in-bound link qualities. -2.3 Link Quality +2.3 Bi-directional Link Quality -------------------------------------------------------------------- -The link quality between a directed node pair (A,B) is the probability -that a packet transmitted by A will be successfully received and -acknowledged by B. The bidirectional link quality of an undirected -node pair (A,B) is the product of the link quality of (A,B) and -(B,A). This definition assumes independent link losses. It also -includes the case when the link quality of (A,B) and (B,A) are -different; this can occur due to local interference or noise. +LEEP does not define or compute bi-directional link quality. LEEP +provides a way to exchange sufficient information to compute in-bound +and out-bound link qualities. These two link qualities can be used to +compute the bi-directional link quality. One popular way to define the +bi-directional link quality between a node pair (A,B) as the +probability that a packet transmitted by A will be successfully +received and acknowledged by B. This approach computes the +bi-directional link quality of a node pair (A,B) as the product of the +link quality of (A,B) and (B,A). + 2.4 Link Information Entry -------------------------------------------------------------------- -- 2.39.2