From d5206560c41d99f1d2c586605cc26340b55ce919 Mon Sep 17 00:00:00 2001 From: gnawali Date: Sat, 7 Feb 2009 22:55:17 +0000 Subject: [PATCH] rev2 --- doc/txt/tep124.txt | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/doc/txt/tep124.txt b/doc/txt/tep124.txt index 45875024..c1fbf922 100644 --- a/doc/txt/tep124.txt +++ b/doc/txt/tep124.txt @@ -41,7 +41,7 @@ in-bound values to compute bi-directional link quality. Thus, LEEP is a discovery and link table bootstrapping mechanism. The link quality is often fine-tuned using different mechanisms. -Link quality estimates obtained using LEEP are often used as a +Link quality estimates obtained using LEEP are often used as bootstrapping values in the link quality table; data transmission statistics can later be used to make these estimates more accurate. @@ -53,12 +53,12 @@ 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 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. +of the link from A to B estimated by B as the fraction of successfully +received packets from 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 -------------------------------------------------------------------- @@ -75,12 +75,9 @@ link qualities. 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). +compute the bi-directional link quality. Routing protocols often +compute the bi-directional link quality of a node pair (A,B) as a +function (product, min, etc.) of the link quality of (A,B) and (B,A). 2.4 Link Information Entry -- 2.39.2