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请教基站21M开通后是否会出现覆盖收缩的情况?  (进入论坛模式)
提问者:hustxdy1979   |  提问时间:2011-8-11 14:10
网上有人说开启21M后,载波的输出功率会减弱,覆盖会自动收缩。

按理说只有在开双载波,且整个小区输出功率不变的情况下,才会因为载波功率平均分配,导致一个载波的功率下降3dB。

但是广播信道如果在两个载波上都发射,终端采用MRC或者branch select都可以弥补这个功率下降啊。

请教各位牛人
关闭所有答案回应     最佳答案
cairat129 的答案    ( 采纳时间:2011-8-17 08:36 )
仅对单载波来说,当采用64QAM,如果基站功放没有预留余量(特别是早期基站功放设计没有考虑到未来高阶调制的应用),为了保证功放的安全,最大的输出功率将有一定回退,则小区覆盖会缩小。
回应该答案 (1)  |  回答时间:2011-8-12 13:01
该答案得到 1 个回应   我要回应
hustxdy1979  |  2011-8-17 08:36
首先我搞错一个事情,以为21m是用DualCell-HSDPA来实现的,但是实际上是引入64QAM,这样原因就应该是4楼的,是PA的dynamic range不够的clip效应。 将来联通上了dualcell的话,如果广播信道还是单载波发射(现在看来很可能),那么覆盖范围还要缩小3dB。
其他答案 ( 21 条 )
在实践中,开启21M后,覆盖范围确实小了。
回应该答案 (0)  |  回答者:张延考   (技术员二级)  |  2011-8-12 07:45
如果用dual cell,是会缩小吧。但如果只是用64QAM,覆盖没变啊。
回应该答案 (1)  |  回答者:illidan   |  2011-8-12 08:29
该答案得到 1 个回应   我要回应
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如果不考虑容量和干扰的因素,覆盖半径就取决于基站的发射功率,但是也必须要考虑手机的上行功率
就如LZ所说开双载波,且整个小区输出功率不变的情况下,载波功率平均分配,会导致覆盖半径收缩。
另外HSPA+ DL由16QAM->下行64QAM,上行16QAM 增加了容量,减小了时延
DL 16QAM->64QAM 下行速率提升50% 14.4*1.5=21.6Mbps 其容量的增加是通过调制方式的变化
64QAM在信号质量较好时才启动,对于小区边缘吞吐率无提升。
CQI决定是否能够启用64QAM,CQI>25可以启动64QAM,小区近点CQI高,可以使用64QAM.小区边缘CQI低,很难满足64QAM,并且高数据业务一般式在室内的。
如果大家从CQI的角度来考虑的话,由于64QAM对CQI要求高,只要跟小区近点才能满足,这就造成覆盖范围减小
回应该答案 (0)  |  回答者:pxl888   (技术员二级)  |  2011-8-12 13:12
提高速率必然增加了功耗,那同等硬件情况下,覆盖面积就小了。
回应该答案 (0)  |  回答者:topcool99   (技术员二级)  |  2011-8-12 13:19
补充:基站覆盖范围的用户越多,覆盖范围就越小,这就是吸缩效应!
回应该答案 (0)  |  回答者:7115cxk   |  2011-8-12 17:09
联通开通21M后明显感觉到同一地点的信号变弱了,覆盖半径肯定是变小了
 |  回应该答案 (0)  |  回答者:sunyefei   |  2011-8-12 17:20
过来学习下
回应该答案 (0)  |  回答者:meteor666   |  2011-8-12 19:32
联通开通21M后明显感觉到同一地点的信号变弱了,覆盖半径肯定是变小了
 |  回应该答案 (0)  |  回答者:陆飞   |  2011-8-12 22:50
是啊,我也听说过有这种情况的
回应该答案 (0)  |  回答者:xbwmail   |  2011-8-13 10:59
学习 学习
回应该答案 (0)  |  回答者:lengkuo   |  2011-8-13 14:56
如果不考虑容量和干扰的因素,覆盖半径就取决于基站的发射功率,但是也必须要考虑手机的上行功率
就如LZ所说开双载波,且整个小区输出功率不变的情况下,载波功率平均分配,会导致覆盖半径收缩。
另外HSPA+ DL由16QAM->下行64QAM,上行16QAM 增加了容量,减小了时延
DL 16QAM->64QAM 下行速率提升50% 14.4*1.5=21.6Mbps 其容量的增加是通过调制方式的变化
64QAM在信号质量较好时才启动,对于小区边缘吞吐率无提升。
CQI决定是否能够启用64QAM,CQI>25可以启动64QAM,小区近点CQI高,可以使用64QAM.小区边缘CQI低,很难满足64QAM,并且高数据业务一般式在室内的。
如果大家从CQI的角度来考虑的话,由于64QAM对CQI要求高,只要跟小区近点才能满足,这就造成覆盖范围减小.

回应该答案 (0)  |  回答者:private   |  2011-8-14 11:53
当采用64QAM,如果基站功放没有预留余量(特别是早期基站功放设计没有考虑到未来高阶调制的应用),为了保证功放的安全,最大的输出功率将有一定回退,则小区覆盖会缩小。
回应该答案 (0)  |  回答者:爱吃西红柿   |  2011-8-14 11:57
一般说到覆盖半径问题,不考虑终端因素吧,所以肯定是缩小的。
回应该答案 (0)  |  回答者:小小酒窝   |  2011-8-14 12:02
用PA+应该可以得到改善 Vodafone, T-Mobile, Orange都在用
 |  回应该答案 (0)  |  回答者:jmjime   |  2011-8-14 23:43
回复 5# 的帖子
我所说的覆盖范围和你的概念不太一样,我是指广播信道的,不是业务信道的,这个问题我后来查了查资料,问问人,首先我搞错一个事情,以为21m是用DualCell-HSDPA来实现的,但是实际上是引入64QAM,这样原因就应该是4楼的,是PA的dynamic range不够的clip效应。
将来联通上了dualcell的话,如果广播信道还是单载波发射(现在看来很可能),那么覆盖范围还要缩小3dB。
 |  回应该答案 (0)  |  回答者:hustxdy1979   |  2011-8-15 01:27
看着像是联通WCDMA的3G 信号 基站,不是很明白这个领域,学习
 |  回应该答案 (0)  |  回答者:zb0567   |  2011-8-15 06:47
多谢各位,又学到了不少啊:)
 |  回应该答案 (3)  |  回答者:mscbsc9708   |  2011-8-15 11:09
该答案得到 3 个回应   我要回应
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在现网默认配置下开通21M,的确会出现基站覆盖范围缩小情况。
回应该答案 (0)  |  回答者:txb1228   |  2011-8-15 11:18
确实会出现基站覆盖范围缩小情况。
回应该答案 (0)  |  回答者:鬼心羽   |  2011-8-15 16:20
确实会出现基站覆盖范围缩小情况,呼吸效应也会导致此情况发生
回应该答案 (0)  |  回答者:general929   |  2011-8-15 18:35
从基站和终端综合分析数据量
回应该答案 (0)  |  回答者:dh1987073   |  2011-8-16 11:35
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