Bug 935

Summary:	802.11a devices communicate with 802.11b devices
Product:	ns-3	Reporter:	Yang Chi <yangchi.cn>
Component:	wifi	Assignee:	Nicola Baldo <nicola>
Status:	RESOLVED INVALID
Severity:	normal	CC:	ns-bugs, quincy.tse
Priority:	P2
Version:	ns-3.8
Hardware:	PC
OS:	Linux
Attachments:	sample code used to reproduce this bug

Description Yang Chi 2010-06-03 20:16:27 UTC

When the channel numbers are set to the same number, 802.11a devices communicate with 802.11b devices in ns-3. This happens in both stable versions: 3.7 and 3.8. Sample codes attached to reproduce this bug.

Comment 1 Yang Chi 2010-06-03 20:17:41 UTC

Created attachment 911 [details]
sample code used to reproduce this bug

Comment 2 Quincy Tse 2010-06-07 01:53:35 UTC

But 11a and 11b devices shouldn't have the same channel numbers.

The lowest channel for 802.11a is Ch. 34, and the highest channel for 802.11b/g is 11.

Comment 3 Nicola Baldo 2010-06-07 04:40:15 UTC

(In reply to comment #2)
> But 11a and 11b devices shouldn't have the same channel numbers.

I agree with Quincy. I am closing this bug as invalid. Yang, please feel free to reopen this bug with further comments if you think that we are in error.

Comment 4 Yang Chi 2010-06-07 17:35:38 UTC

I see. my own mistake. Everytime I install ns-3, I change the base frequency of 11a to 5017 first...(yans-wifi-phy.cc). I forgot this when I reported the bug. Thx for comments.

Comment 5 Quincy Tse 2010-06-07 20:54:16 UTC

Having said that, since I don't know how the channels have been implemented, there may still be a hidden problem later on for the case 802.11p and 802.11a/n devices. I understand that there is an overlap there. 11p uses half the channel bandwidth and really shouldn't be able to communicate with 11a/n.

I won't reopen the bug though.