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LTE上下行的信道带宽什么时候不同?
LTE题库有一题是选择关于LTE的正确描述,答案中有一个“上下行的信道带宽可以不同”,我没明白上下行信道带宽什么时候会有不同。我理解TDD的上下行带宽是相同的,FDD上下行频段不同,但也是对称的,这里为什么是对的呢,还请赐教!
提问者: MrYOHO 提问时间: 2014-03-15
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问题答案
( 2 )
上,下行的带宽是一样的!
只是上,下行调制方式不同,所以速率不同;
回答者:
litom2004
回答时间:2014-03-15 17:54
13 12
通常是对称的,但TDD-LTE是支持上下行非对称的:
http://lteuniversity.com/get_trained/expert_opinion1/b/lauroortigoza/archive/2012/06/12/lte-fdd-vs-lte-tdd-a-k-a-lte-td.aspx
Asymmetry: LTE supports asymmetric bandwidth in the UL and DL. LTE-TDD can be configured to favor one link over the other. Due to the existence of an additional guard time in LTE-TDD, LTE-TDD is slightly less efficient than LTE-FDD, however, it offers more flexibility to serve asymmetric traffic (i.e.: http, ftp, etc.)
http://lteuniversity.com/get_trained/expert_opinion1/b/lauroortigoza/archive/2012/06/12/lte-fdd-vs-lte-tdd-a-k-a-lte-td.aspx
Asymmetry: LTE supports asymmetric bandwidth in the UL and DL. LTE-TDD can be configured to favor one link over the other. Due to the existence of an additional guard time in LTE-TDD, LTE-TDD is slightly less efficient than LTE-FDD, however, it offers more flexibility to serve asymmetric traffic (i.e.: http, ftp, etc.)
回答者:
wwwmscbsccom
回答时间:2014-03-16 08:30
17 16
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