[Olsr-users] Topology Set Fields

Bhat, Ishwara (spam-protected)
Thu Jan 22 10:34:29 CET 2009


1. So LQ and NLQ are really for forward and reverse links between the two nodes?

2. What does the value in link quality signify ? Is there any relation between LQ or NLQ and values like RSSI or Received Channel Power Indicator ?

3. If the Wi-fi card reads certain dBm value when it receives a packet from the neighbor, how is this translated to the LQ value ?

4. ETX: Expected Tx Count .. I understood how this is calculated. What is its significance? 
Does it tell us how many retires are required? Or it is a normalized value indicating the path cost ?

5. In topology set, do we indicate hop count anywhere ?

6. About "UP", please see the attached snapshot. I used 0.5.6-rc1 version and I get the screen like that. Also it lists "ILQ" not "NLQ". Is this meant to be NLQ itself?
 Should I use different version of OLSRd ?

7. And, I browsed the code little bit. In tc_set.h I saw 2 structures. I was hoping to find mapping between the fields topology set shown on the console and the structure. But could not figure this out. 

Please tell how the console's mapping with code.


-----Original Message-----
From: Henning Rogge [mailto:(spam-protected)] 
Sent: Thursday, January 22, 2009 2:35 PM
To: Bhat, Ishwara
Cc: (spam-protected)
Subject: Re: [Olsr-users] low signal and dropping default route

Am Thursday 22 January 2009 09:46:53 schrieb Bhat, Ishwara:
> Hi,
> Now that link quality is being discussed, please tell more on the link
> quality fields of topology set.
> In the console we have topology set which lists LQ, ILQ, ETX and UP. Please
> explain these. I could not find this in the OLSR report.

LQ (Link Quality):
how well sees a node it's neighbor (a value between 0 and 1)

NLQ (Neighbor link quality):
how well sees the neighbor the node (a value between 0 and 1)

ETX (Expected transmission count):
ETX = 1 / (lq * nlq)

UP ????


Diplom Informatiker Henning Rogge
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Angewandte Naturwissenschaften e. V. (FGAN) 
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