Subject: [manet] DSR route request limit rate

From: manet user <[email-masked]>
Date: Wed, 7 Sep 2005 14:50:30 -0700 (PDT)

Hi all,
 
As per dsr_draft_08.txt (page 7), 
 
In order to reduce the overhead from such Route Discoveries, a node SHOULD use an exponential back-off algorithm to limit the rate at which it initiates new Route Discoveries for the same target, doubling the timeout between each successive Discovery initiated for the same target. If the node attempts to send additional data packets to this same destination node more frequently than this limit, the subsequent packets SHOULD be buffered in the Send Buffer until a Route Reply is received giving a route to this destination, but the node MUST NOT initiate a new Route Discovery until the "minimum allowable interval" between new Route Discoveries for this target has been reached. 
 
Here what is the "minimum allowable interval"? I believe this minimum allowable interval will be the rate limit for sending RREQ, but draft does not provide any default value.
 
Draft provides the Initial Request Period value of 0.5 seconds. My understanding is that this value will be exponentially increased with reach RREQ retry for same destination. But if the data packet arrival for a destination is really high, source node will send out RREQ only after each "minimum allowable interval"? Is that correct? If yes, then for such case, Initial Request value of 0.5 second and exponential backoff will not have any usage, as RREQ sent is controlled by "minimum allowable interval". Please comment.
 
What should be a good value for "minimum allowable interval", greater than Initial Request value?
 
Thanks in advance.

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