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Scrambling Code Planning
Hello Guys,
I'm on a new project and planning the scrambling code for the entire network, however, i need some support/help from all professionals here already working on UMTS network.
First, is there any particular order/pattern in allocating PSC...the reason i'm asking is that a friend was saying something about 2 different PSC being able to clash based on some calculations i couldnt understand.
Also, is there a way i could automatically plan the PSC and neighbours using ATOLL?
My plan is as below, a set of 3 vertical codes for each site (i.e 0,3,6);
0 9 18.........
3 12 21.........
6 15 24.........
2 10 19.........
4 13 22.........
7 16 25.........
Please any ideas or better way of planning?
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2011-08-15 08:48 PM
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VIP Member
Reputation: 1289
Re: Scrambling Code Planning
Originally Posted by
Processor
Hello Guys,
I'm on a new project and planning the scrambling code for the entire network, however, i need some support/help from all professionals here already working on UMTS network.
First, is there any particular order/pattern in allocating PSC...the reason i'm asking is that a friend was saying something about 2 different PSC being able to clash based on some calculations i couldnt understand.
Also, is there a way i could automatically plan the PSC and neighbours using ATOLL?
My plan is as below, a set of 3 vertical codes for each site (i.e 0,3,6);
0 9 18.........
3 12 21.........
6 15 24.........
2 10 19.........
4 13 22.........
7 16 25.........
Please any ideas or better way of planning?
Hi friend,
We use Asset for SC Planning (you need plan neighbor list first, Planning tool will use this neighbors plan and the distance to assign SC). I think Atoll have automatic SC Planning too.
It is easy (like BSIC Planning in GSM)
In WCDMA we have 512 really different code so it is easy (not as same as CDMA2000, codes differ the other by phase, more difficult).
I see some guys (especially in Huawei) use pattern, but i think it is more complex and waste time
Regards
Last edited by lejun; 2011-08-16 at 01:56 AM
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Member
Reputation: 39
Re: Scrambling Code Planning
Originally Posted by
Processor
Hello Guys,
I'm on a new project and planning the scrambling code for the entire network, however, i need some support/help from all professionals here already working on UMTS network.
First, is there any particular order/pattern in allocating PSC...the reason i'm asking is that a friend was saying something about 2 different PSC being able to clash based on some calculations i couldnt understand.
Also, is there a way i could automatically plan the PSC and neighbours using ATOLL?
My plan is as below, a set of 3 vertical codes for each site (i.e 0,3,6);
0 9 18.........
3 12 21.........
6 15 24.........
2 10 19.........
4 13 22.........
7 16 25.........
Please any ideas or better way of planning?
Hello, we use like:
10,11,12
13,14,15
and so on.
From 0 to 9 for indoor sites. No need to use Atoll for indoor planning, easy to choose one from set 0-9 PSC
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Re: Scrambling Code Planning
Who's equipment is in question? In general, it is recommended to use as lower number of code groups and as much as possible codes inside the group to make cell search time shorter as possible and not to use all codes because of future upgrades and new sites...
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Member
Reputation: 28
Re: Scrambling Code Planning
Unlike CDMA which is synchronous system. UMTS (WCDMA) is asynchronous and all the SC code are pseudo-orthogonal to each other. Therefore, you can use a random assignment for SC planning among the 512 primary SC (Ex: sector A's SC = 3, sector B's SC= 4 and sector C's SC=8 still work without any clash or SC collision.
A test I have done for a first-tier vendor on the behalf of a big operator has shown no difference between planning by code group (8 SC for a group) and random assignment. by confidentiality, the names can not be told here. But you can use random assignment. The SC-code group is aimed to speed up SC decoding for the UE but now with powerful processing capacity, the decoding time is minimal.
The operators, usually with conservative method inherited from TDMA/GSM system still prefers to have SC group...But in reality, it doesn't change much
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VIP Member
Reputation: 1289
Re: Scrambling Code Planning
Originally Posted by
rffreeconsult
Unlike CDMA which is synchronous system. UMTS (WCDMA) is asynchronous and all the SC code are pseudo-orthogonal to each other. Therefore, you can use a random assignment for SC planning among the 512 primary SC (Ex: sector A's SC = 3, sector B's SC= 4 and sector C's SC=8 still work without any clash or SC collision.
A test I have done for a first-tier vendor on the behalf of a big operator has shown no difference between planning by code group (8 SC for a group) and random assignment. by confidentiality, the names can not be told here. But you can use random assignment. The SC-code group is aimed to speed up SC decoding for the UE but now with powerful processing capacity, the decoding time is minimal.
The operators, usually with conservative method inherited from TDMA/GSM system still prefers to have SC group...But in reality, it doesn't change much
Yes, i plan as your method (random assignment) and performance is good
Regards
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Member
Reputation: 35
Re: Scrambling Code Planning
there is an Atoll plugin that does automatic code planning (ACP) and it generates automatically your codes for the cells.
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Member
Reputation: 212
Re: Scrambling Code Planning
Hi,
Many thanks for the great input, do you have a spreadsheet template that you use for your Scramble Code Planning you could share for us..
Thanks,
bikplaboi..
Originally Posted by
rffreeconsult
Unlike CDMA which is synchronous system. UMTS (WCDMA) is asynchronous and all the SC code are pseudo-orthogonal to each other. Therefore, you can use a random assignment for SC planning among the 512 primary SC (Ex: sector A's SC = 3, sector B's SC= 4 and sector C's SC=8 still work without any clash or SC collision.
A test I have done for a first-tier vendor on the behalf of a big operator has shown no difference between planning by code group (8 SC for a group) and random assignment. by confidentiality, the names can not be told here. But you can use random assignment. The SC-code group is aimed to speed up SC decoding for the UE but now with powerful processing capacity, the decoding time is minimal.
The operators, usually with conservative method inherited from TDMA/GSM system still prefers to have SC group...But in reality, it doesn't change much
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Member
Reputation: 81
Re: Scrambling Code Planning
Hi all
I have used both and definitively they all work, but the problem comes when there is high density of sites. With random you need to be carefull not to assign the same sc to a second or third neighbor cell. Drop connections start to increase.
So depending on the scenario the best approach is the create polygon and form groups of cells and create a plan with a spare capacity.
The problem is when the network grow and you have IRATs relations created.. To re-organized every thing is like a surgery, every detail counts.
As a expert wrote in this forum, the assignment work 1,2,3 or 8,16,32 bcz they are pseudo-orthogonal codes. The issue is to plan for future to avoid colisions.
Best Regards
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Re: Scrambling Code Planning
Please does anyone have any PSC plan templates?
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