[Tinyos-help] [Tossim] Duplicate messages

[Pratibha S]

Hi,

I use a 200 node topology(topology is connected with zero link loss rates)
on Tossim. I want to calculate the quality of the network in terms of path
stretch and success rate. For that each node will send messages to all other
nodes periodically for one cycle. I capture the sent and received packet
details onto a file. So, I send 39,800 messages totally.

I find that the packet loss in between the nodes are high (approx. 50%) even
though the link loss rates are zero. Does this mean that, tossim simulates
packet loss due to collisions and interference? Even if it does, would the
loss rate be this high?
I see a a lot of duplicate receive messages though the sends are unique. Can
anyone tell me why?

*Sent messages
1.Message_Type 2.Source_Node 3.Destination_Node 4.Data
........
SEND [35] [150] (186,60)
SEND [35] [66] (102,953)
SEND [35] [181] (17,114)
SEND [35] [185] (21,766)
SEND [35] [33] (69,253)
SEND [35] [152] (188,310)
SEND [35] [29] (65,685)
SEND [35] [56] (92,940)
SEND [35] [96] (132,31)
SEND [35] [151] (187,1070)
SEND [35] [90] (126,961)
SEND [35] [133] (169,224)
SEND [35] [70] (106,9)
SEND [35] [72] (108,656)
SEND [35] [168] (4,666)
SEND [35] [54] (90,296)
SEND [35] [154] (190,588)
SEND [35] [97] (133,1227)
SEND [35] [157] (193,892)
SEND [35] [41] (77,243)
......
*
*Receive messages*
*1.Message_Type 2.Source_Node 3.Data 4.hop_count*
.........
*RECEIVE 123 (1201,126)  86
RECEIVE 123 (1201,126)  86
RECEIVE 35 (993,216)  108
RECEIVE 93 (1278,50)  88
RECEIVE 93 (1278,50)  88
RECEIVE 35 (993,216)  108
RECEIVE 93 (1278,50)  88
RECEIVE 35 (993,216)  108
RECEIVE 35 (993,216)  108
RECEIVE 35 (993,216)  108
RECEIVE 74 (889,128)  106
RECEIVE 35 (993,216)  108
RECEIVE 74 (889,128)  106
RECEIVE 74 (889,128)  106
RECEIVE 35 (993,216)  108
RECEIVE 74 (889,128)  106
RECEIVE 74 (889,128)  106
RECEIVE 35 (993,216)  108
RECEIVE 35 (993,216)  108
RECEIVE 74 (889,128)  106
RECEIVE 35 (993,216)  108
RECEIVE 74 (889,128)  106
RECEIVE 20 (76,647)  31
RECEIVE 74 (889,128)  106
.....................
....................(150+ messages)
RECEIVE 10 (1204,950)  103
RECEIVE 10 (1204,950)  103
RECEIVE 35 (993,216)  112
.........

*Thanks,
Pratibha
*
*
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