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在CDMA中关于切换，下面说法中正确的是

2006-07-28 21:57:07

在CDMA中关于切换，下面说法中正确的是

10.       在CDMA中关于切换，下面说法中正确的是：（    ）
A.       软切换是指在切换过程中，移动台开始与新的基站联系时，并不中断与原有的基站的通信。
B.       更软切换与软切换类似，发生在同一基站的不同扇区之间。
C.       更软切换和软切换类似，它们的业务信道帧都是在BSC（基站控制器）中合并的。
D.       硬切换是指在切换过程中，移动台与新的基站联系前，先中断与原基站的通信，再与新基站建立联系。硬切换过程中有短暂的中断，容易掉话

This test is come from --  http://bbs.cnttr.com/viewthread.php?tid=57830&extra=page%3D1

and guys all agree the answer is: ABD.

For the answer B, I have different thought.

Originally, I have same sense with them. But when I think more, I have this idea and wish you can join in this discussion.

My question is: Why could the sofer handover not happen in intra-Node B intra-cell?

For example, if RNC wna to adjust its OVSF tree due to large amount of code fragment . Normally, RNC can send "Physical Channel Reconfig" or "Transport Channel Reconfig" or "RB reconfig" to adjust the channelization code. But this should be hard handover(Although this action is very fast)

At this time, RNC can assign another Radio link with same Scrambling code but different channelization code to UE. Thus, UE could have different channelization codes and same scrambling code. At this time, UE should stay in softer handover state.

Then, RNC release the older one . The procedure of adjustment is done.

[ 本帖最后由 James-Ran 于 2006-7-28 21:58 编辑 ]

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James-Ran 发布于2006-08-02 23:08:15: QUOTE:
原帖由 xingpp 于 2006-8-2 22:53 发表

只有2条RL的参数除了扰码完全一样才能作更软切换，一个小区内有必要作这样的切换？一般是重配置某些参数，如SF=64->SF=32等，所以完全不可能这样处理的。

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Yes, what you said is normal execution. But we could not counterwork the standard will can do in future. (because this is marked as not supportted in current release)

xingpp 发布于2006-08-02 22:53:42: QUOTE:
原帖由 James-Ran 于 2006-8-2 22:31 发表www.cnttr.comF8NgmF#g+\G]"OJ

w{d4QQ4X{?;Nwww.cnttr.com
In current release, one cell does not support two radio links for one UE. Thus, we can know softer handover can't generated in same cell.
But from theorical analysis, one cell could support th ...

只有2条RL的参数除了扰码完全一样才能作更软切换，一个小区内有必要作这样的切换？一般是重配置某些参数，如SF=64->SF=32等，所以完全不可能这样处理的。

James-Ran 发布于2006-08-02 22:31:47: QUOTE:
原帖由 xingpp 于 2006-8-2 14:23 发表
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关键就在这里：
切换是"from one radio channel to another"。
"Y2QB(o(?0c.G$`Vwww.cnttr.com
对于James所提的小区内码切换，其实是" The code of one radio channel is changed from one to another"，可以称为” ...

In current release, one cell does not support two radio links for one UE. Thus, we can know softer handover can't generated in same cell.
But from theorical analysis, one cell could support this method future. For example, for the current code reconfiguration in same cell, this kind of handover should belongs to hard handover. If one cell can support two RL for one UE, thus, softer handover could be. Thus, if RNC will reconfigure the OVSF of UE, no any interruption will be.

xingpp 发布于2006-08-02 15:03:55: QUOTE:
原帖由 wangyouxin36 于 2006-8-2 14:27 发表
更软切换和软切换类似，它们的业务信道帧都是在BSC（基站控制器）中合并的。

不在BSC中合并，在哪里合并呀？

对，应该说，上面4条都对。

更软切换和软切换的本质一个是最大比合并，一个是选择合并。

对于下行，UE基本上都可以对多条支路作最大比合并；而对上行，只有同一个基站同一个解调板小区的支路才可以使用更软切换（更软切换在NodeB执行），其它的都是在RNC进行选择合并。所以上述说明应该是对的。
www.cnttr.comym1Zcz6D;vB8t,x[
另外，更软切换还是软切换是由RNC控制的。

wangyouxin36发布于2006-08-02 14:27:14: 更软切换和软切换类似，它们的业务信道帧都是在BSC（基站控制器）中合并的。

不在BSC中合并，在哪里合并呀？

xingpp 发布于2006-08-02 14:23:17: QUOTE:
原帖由 James-Ran 于 2006-7-31 00:19 发表`6]|9mr(x6b"ap
The standard definition derived from 21.905:
"Handover: The transfer of a user’s connection from one radio channel to another (can be the same or different cell)."U ?B9Ig7|#{(`2F+Jq

James' comments: ...

关键就在这里：
切换是"from one radio channel to another"。
f+J^&q(UG.Yj
kKt4l^(T6X}'p对于James所提的小区内码切换，其实是" The code of one radio channel is changed from one to another"，可以称为”信道重配置“。

不象切换，不管是软切换还是硬切换，在网络侧必然存在two randio channel 共存的情况（对于硬切换是暂时的）。

James-Ran 发布于2006-08-01 18:48:30: recommend to read it again

James-Ran 发布于2006-07-31 17:29:13: recommend to read it
James

James-Ran 发布于2006-07-31 00:19:36: The standard definition derived from 21.905:
"Handover: The transfer of a user’s connection from one radio channel to another (can be the same or different cell)."
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James' comments: from this, we can know handover can generate in same or different.

I guess the real reason is :
In 25.211(you can refer to my previous document's comments), we can get this words--"support of multiple CCTrChs of dedicated type is not part of the current release" which means UE don't support two or more CCTrChs in one cell. Thus,it's impossible for UE have two radio links connected to same cellwww.cnttr.comhtqyZ-CH_
Also for the definition of RL in 21.905--"Radio link: A "radio link" is a logical association between single User Equipment and a single UTRAN access point. Its physical realisation comprises one or more radio bearer transmissions." here, we can know only one RL existing between UE and one cell.(only one!)

Welcome your comments!
James

自由比尔发布于2006-07-30 17:40:10: QUOTE:
原帖由 lxynetboy 于 2006-7-29 12:03 发表
更软切换在不同扇区之间，信号用的是不同的扰码加扰，所以才有切换的概念。在同一扇区下，发生的信道重新配置，并不涉及到其他扇区，因此不能称为切换。

同意上述的理解，尽管James-Ran说的在同一个小区发生ovsf码树重新配置的状态可能和切换时所使用的业务流程差不多，但不能称之为切换。
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欢迎热批！

James-Ran 发布于2006-07-30 14:06:43: QUOTE:
原帖由 lxynetboy 于 2006-7-29 12:03 发表
更软切换在不同扇区之间，信号用的是不同的扰码加扰，所以才有切换的概念。在同一扇区下，发生的信道重新配置，并不涉及到其他扇区，因此不能称为切换。
#U!M)t*B7eA"n

'fDz%k!^h)fJ}www.cnttr.comguy, pls check my statements carefully again,

renew发布于2006-07-29 20:31:37: James研究的越来越深奥了，有时候偶都反应不过来讨论的是啥了。

lxynetboy发布于2006-07-29 12:03:18: 更软切换在不同扇区之间，信号用的是不同的扰码加扰，所以才有切换的概念。在同一扇区下，发生的信道重新配置，并不涉及到其他扇区，因此不能称为切换。

James-Ran 发布于2006-07-29 07:29:52: 为何更软切换不能发生在同一个NODE B的同一个小区里呢?

jobber 发布于2006-07-29 05:16:08: Why could the sofer handover not happen in intra-Node B intra-cell?
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不太理解

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