- This topic has 14 replies, 1 voice, and was last updated 9 years, 6 months ago by Malay Das.
1st April 2011 at 09:36 #66087bjushkaGuest
I have a question related to frequency hopping feature.
In a RF hopping system, HSN (hopping sequence number) is chosen randomly or there is a HSN plan that has to be used?
I dont understand how the sequence is generated! Should adjacent value of HSNs be used in nearer sites?
Please help me,
bjushka1st April 2011 at 17:15 #66088pixGuest
each HSN generates a random sequence of frequencies. The 63 HSN’s (from 1 to 63) are orthogonal.
The only thing you must ensure is that neighbour BTS are using different HSN (adjacent or far, doesn’t matter).1st April 2011 at 20:39 #66089bjushkaGuest
So, this mean that choosing random HSN (in SFH)for each site, will not effect on the network performance!!!
Thanks Pix for the help
.bjushka.1st April 2011 at 22:46 #66090JasonGuest
We use a mod64 HSN. Basicly we take the site number and subtract one then divide that by 64 to get our hsn. I thought you could use a 0 but that is one you dont want to use.6th April 2011 at 08:23 #66091JellyGuest
To plan the HSN, you can go by this way: NCC*8+BCC6th April 2011 at 08:30 #66092bjushkaGuest
What if NCC+BCC for one site is the same with an other neighbor site (BCCH frequencies are different)?
We cant have same HSN for these two sites?
Why you think NCC and BCC is related to HSN?
Sorry for so many questions 🙂
Thanks in advance to everyone
.bjushka.19th May 2011 at 07:18 #66093Malay DasGuest
Why we use same HSN in the each sector of a BTS???19th May 2011 at 11:20 #66094SHELDONGuest
You can use the same HSN in each sector and use MAIO to prevent interference between sectors.19th May 2011 at 12:17 #66095Malay DasGuest
I am not asking about MAIO or not about Interference Prevention..
I am just asking “why we use same HSN in each sector of a BTS?”
Is there any reason that we have to use the same HSN in every sector of that particular BTS?19th May 2011 at 18:05 #66096pixGuest
hi malay das,
well, it’s very difficult to reply to you because we are falling in a paradoxal loop.
1/ Using the same HSN in the BTS is an “interference prevention”, as you named it.
2/ You don’t want us to talk about interference prevention…
So I would suggest you search in this forum : the usage of HSN has been discussed before.
pix20th May 2011 at 17:10 #66097Malay DasGuest
If u don’t wanna answer its ok.
But before that I want You to look at my Question & Comment.
In my comment I’m not asking about
MAIO & you are Telling that
“Using the same HSN in the BTS is an “interference prevention”, as you named it”..
Have you seen my comment???
Am i asking “Using the same HSN in the BTS is an “interference prevention”????
And Who the hell are you to forbid me In such language(You don’t want us to talk about interference prevention..)???20th May 2011 at 17:17 #66098Malay DasGuest
I would suggest you to shout your mouth up and look carefully total comment Before doing such comment…20th May 2011 at 18:43 #66099pixGuest
i’m reading your post carefully…
you want to know about hsn in the same BTS.
it is a method to prevent interference.
so what else do you want to know ??
sheldon replied to you perfectly but you didn’t like his answer..
now you don’t like mine…
i think you misunderstood my previous post : the points (1) and (2) are summary of your own post:
“I am not asking about MAIO or not about Interference Prevention..
I am just asking “why we use same HSN in each sector of a BTS?””
We are only trying to answer your question. Nothing more… Chill out.
pix20th May 2011 at 21:15 #66100RexGuest
Hi Malay Das,
I’m not sure but I think that each HSN number has its own hopping algorithm. With the same HSN in all cells (same algorithm, same rule) of a BTS using different MAIO (different frequencies in the same time) for each TRX you prevent interference.
With different HSN number in cells, so different algorithms, it means that is very possible using same frequency in the same time very often and that causes interference.
And, please, don’t use such a language any more. The best contributor in this forum is Pix. You shouldn’t do that. Shame on you. I’m sure you’re a nice guy and sometimes we all are angry about something.
Rex21st May 2011 at 08:15 #66101Malay DasGuest
Thx for your contribution.
Sorry for everything..