欢迎来逛逛,聊聊技术,侃侃大山. 本人主要喜欢WCDMA/TD-SCDMA无线侧的技术，如果有何关于无线技术方面的问题，你可以给我留言，我们可以一起讨论，共同提高。

The usage of scrambling codes in TD

2006-10-30 14:05:01

Here, I have a question about SC in TD. Wish get your help.中国通信网－无限分享;S$yR&lz z

l"P z'q,N;V6co0 This is right--- Scrambling code is used for DL NOT UL direction in TD-SCDMA, right?中国通信网－无限分享 X]3paZf1w!Q
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James

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TD-SCDMA随笔 message 发布于2006-10-30 21:20:57
Analyse the difference of W&TD is a good means to learn TD. I can benefit from it too. Thank you!
James-Ran的个人空间 James-Ran 发布于2006-10-30 15:59:11
thanks,message.欢迎光临中国通信网,这里为您提供通信技术,通信资源,通信资料,电信技术,移动通信,3G资料,通信资料下载,通信知识,通信学习,移动通信资料,NGN资料,通信培训,通信人才等服务Lzc        p^0S
James
James-Ran的个人空间 James-Ran 发布于2006-10-30 15:58:16
en, that's right.www.cnttr.com!F-zU#I*Fw1{j
Thus we also can utilize the auto-correlation of same SC with different shifting to reduce MAI.
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k;x:X通信技术|通信资源|电信技术|通信资料| 通信培训|移动通信|通信下载|通信培训|通信人才And for WCDMA, due to the nature of unsynch, thus, we need long SC to achive rough sync, which is different with TD for shorter SC.
TD-SCDMA随笔 message 发布于2006-10-30 15:50:29

QUOTE:

原帖由 James-Ran 于 2006-10-30 15:28 发表通信技术|通信资源|电信技术|通信资料| 通信培训|移动通信|通信下载|通信培训|通信人才u
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message, pls check my comments:
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u,|z^n.Vl欢迎光临中国通信网,这里为您提供通信技术,通信资源,通信资料,电信技术,移动通信,3G资料,通信资料下载,通信知识,通信学习,移动通信资料,NGN资料,通信培训,通信人才等服务1. The message of "RRC connection setup" will be the first message from RNC to UE.
1{*?5L8p*U&e通信技术|通信资源|电信技术|通信资料| 通信培训|移动通信|通信下载|通信培训|通信人才2. If we follow your statement - "It's not allocated in the rrc c ...
6u&V,x;?I5V2?2KN,qyes, you're right, it's different with W. all the ue use the same scramble code in a cell.
James-Ran的个人空间 James-Ran 发布于2006-10-30 15:28:59
message, pls check my comments:
6}cZNh5y;wS通信技术|通信资源|电信技术|通信资料| 通信培训|移动通信|通信下载|通信培训|通信人才1. The message of "RRC connection setup" will be the first message from RNC to UE.
\I;XsP"K2. If we follow your statement - "It's not allocated in the rrc connection setup message"
(|-x;Y Cd+~0ks欢迎光临中国通信网,这里为您提供通信技术,通信资源,通信资料,电信技术,移动通信,3G资料,通信资料下载,通信知识,通信学习,移动通信资料,NGN资料,通信培训,通信人才等服务3. Thus, UE should use the predefined SC for the next message--"RRC connection Setup Complete"欢迎光临中国通信网,这里为您提供通信技术,通信资源,通信资料,电信技术,移动通信,3G资料,通信资料下载,通信知识,通信学习,移动通信资料,NGN资料,通信培训,通信人才等服务s-|,GI6Ji+Ptp
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Here, this bring one question---- If two UE in same cell, they could use same SC as this predefined SC. 通信技术|通信资源|电信技术|通信资料| 通信培训|移动通信|通信下载|通信培训|通信人才Q&Yq6v9j
Or we can say same SC is used for UL for all UE served by same cell???
TD-SCDMA随笔 message 发布于2006-10-30 15:27:51

QUOTE:

原帖由 James-Ran 于 2006-10-30 14:55 发表
"P0t p2k:EU*_www.cnttr.comBut I feel SC is useless for UL direction because OVSF code is enough to distinguish different UEs due to UL synchronization.
.n [+g8uz3H5g,N欢迎光临中国通信网,这里为您提供通信技术,通信资源,通信资料,电信技术,移动通信,3G资料,通信资料下载,通信知识,通信学习,移动通信资料,NGN资料,通信培训,通信人才等服务I agree with you! different UE is distinguished by ovsf code in ul direction.
lovewelkin发布于2006-10-30 15:20:32
SC code is used to distinguish cell in TD. so UL or DL both need to scamble after spreading. the SC code to choose is associated with cell's DL sync code.
TD-SCDMA随笔 message 发布于2006-10-30 15:15:56
the cell para id is scramble id in td-scdma, so if you know the cell para id, you can know the scramble code. you can find it in the physical layer protocol by searching cell_param. I believe you can understand it. It's not allocated in the rrc connection setup message. If you can't find it, please let me know.
James-Ran的个人空间 James-Ran 发布于2006-10-30 14:55:56
But I feel SC is useless for UL direction because OVSF code is enough to distinguish different UEs due to UL synchronization.
James-Ran的个人空间 James-Ran 发布于2006-10-30 14:51:47
ok, but I can't find the SC allocated by RNC in the message of "RRC Connection Setup". 中国通信网－无限分享@t3_
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f欢迎光临中国通信网,这里为您提供通信技术,通信资源,通信资料,电信技术,移动通信,3G资料,通信资料下载,通信知识,通信学习,移动通信资料,NGN资料,通信培训,通信人才等服务If you think so, could you post the relevant log file(some part is enough), thanks, message.
TD-SCDMA随笔 message 发布于2006-10-30 14:40:11
No, all should be used.
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