[Smac-users] questions about SMAC simulation
smac_li at hotmail.com
Tue May 1 07:39:35 PDT 2007
I am now trying to simulate S-MAC on OPNET which is another network
performance simulation tool as NS. Currently, I have two S-MAC documents
which are used to refere my simulation design. They are "An Energy-Efficient
MAC protocol for wireless sensor networks" and "Medium access control with
coordinated adaptive sleeping for wireless sensor networks". The scenario I
am using now is the two hop (5 nodes) topology.
For the same topology, I have found that the simulation parameters are
different in the two papers. But the result curves are the same. Is there
anyone coud please help me out? I have been in the following problems for
more than a month.
(1) could anyone give me the following parameters:
(a) packet size for RTS, CTS, DATA, ACK and SYNC (includes
(b) the data rate and duty_cycle
(c) the length of DIFS, SIFS and SLOTtime
(2) When a node is in DIFS time waiting before a RTS packet transmission, if
the channel becomes busy, how is the node will be? In 802.11 the node will
go to defer process and keep on monitoring the channel stat. I think in
S-MAC to reserve energy the node should go to free stat to receive the
packet which causes the interrupt. Then it can use the duration information
in the received packet to set its NAV to go to sleep untill the end of
current packet exchange process. am I right?
(3) After a successful packet transmission, does the transmittor or receiver
need to go to backoff process to content the channel for further packert
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