ORBIT-USER: Doubts regarding RSSI values in orbitfilter

[semhatre at cc.gatech.edu]

Hi.

I have 1 doubt regarding the emulation of virtual mobility using mac
filters on this wiki

http://www.orbit-lab.org/wiki/HowTo/virtualMobility

I tried the orbitfilter commands on a sandbox while changing the RSSI
value while kepping the packet allow rate constant at 100.

I reduced the RSSI value to 80.(with the helloworld experiment)
But I found that the receiver_otr_receiverport table doesnt show much
difference over the entire range of rssi values from 90 to 10.Some packets
were dropped as given below.I got similar results for RSSI values from 90
to 10 and constant packet accept rate of 100.

The command I included in the script was...

system("ssh root\@node1-2 \/sbin\/iwpriv ath0 orbitfilter 0x00 0x60 0xB3
0xAC 0xA1 0x9A 100 80")

node_id sequence_no timestamp pkt_seqno flow_no rcvd_pkt_size_sample_sum
rx_timestamp rssi xmitrate
node1-2 2 1163983584 1 0 1024 2783260 0 0
node1-2 3 1163983585 39 0 15360 2784295 0 0
node1-2 4 1163983586 69 0 18432 2785115 0 0
node1-2 5 1163983587 105 0 18432 2786098 0 0
node1-2 6 1163983588 141 0 20480 2787081 0 0
node1-2 7 1163983589 179 0 19456 2788118 0 0
node1-2 8 1163983590 214 0 20480 2789074 0 0
node1-2 9 1163983591 252 0 18432 2790113 0 0
node1-2 10 1163983592 288 0 20480 2791095 0 0
node1-2 11 1163983593 326 0 18432 2792133 0 0
node1-2 12 1163983594 362 0 18432 2793115 0 0
node1-2 13 1163983595 398 0 19456 2794098 0 0
node1-2 14 1163983596 436 0 19456 2795136 0 0
node1-2 15 1163983597 472 0 19456 2796119 0 0
node1-2 16 1163983598 509 0 18432 2797130 0 0
node1-2 17 1163983599 545 0 18432 2798112 0 0
node1-2 18 1163983600 582 0 19456 2799124 0 0
node1-2 19 1163983601 619 0 19456 2800133 0 0
node1-2 20 1163983602 655 0 18432 2801116 0 0
node1-2 21 1163983603 691 0 19456 2802100 0 0
node1-2 22 1163983604 728 0 4096 2803110 0 0
node1-2 23 1163983605 0 0 0 0 0 0
node1-2 24 1163983606 0 0 0 0 0 0
node1-2 25 1163983607 0 0 0 0 0 0
node1-2 26 1163983608 0 0 0 0 0 0
node1-2 27 1163983609 0 0 0 0 0 0
node1-2 28 1163983610 0 0 0 0 0 0
node1-2 29 1163983611 1001 0 11264 2810564 0 0
node1-2 30 1163983612 1023 0 7168 2811165 0 0
node1-2 31 1163983613 1074 0 11264 2812558 0 0
node1-2 32 1163983614 1096 0 18432 2813159 0 0
node1-2 33 1163983615 1132 0 18432 2814141 0 0
node1-2 34 1163983616 1168 0 6144 2815124 0 0
node1-2 35 1163983617 0 0 0 0 0 0
node1-2 36 1163983618 0 0 0 0 0 0
node1-2 37 1163983619 0 0 0 0 0 0
node1-2 38 1163983620 0 0 0 0 0 0
node1-2 39 1163983621 0 0 0 0 0 0
node1-2 40 1163983622 0 0 0 0 0 0

Doesn't change in the RSSI value cause any change in the packets received?
Also why do we get bursts of 0 packets in 5 second intervals?

Regards,
Swapnil