Localized / Distributed Transmission for MPDCCH

Link: http://lteuniversity.com/get_trained/expert_opinion1/b/ywang/archive/2014/07/21/what-are-localized-and-distributed-transmissions-for-epdcch.aspx

 

<Legacy LTE>

RE --> REG --> REG group(?) --> CCE

 

<LTE-M>

RE --> eREG --> eREG group (localized) --> eCCE

RE --> eREG --> eREG group (distributed) --> eCCE

 

 

차이는 eREG로 eREG group을 만드는 방법이 다른 것임!!!!!! (eCCE를 만드는 방법이 다른게 아님!)

 

 

 

 

 

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Localized transmission

 

• Localized transmission is usually used where reliable subband CSI feedback is available such that frequency selective and advanced antenna technologies can be explored to increase the spectral efficiency.

 

 

 

 

 

 

 

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Distributed transmission

• Distributed transmission is less dependent on channel feedback, so it is usually used where reliable CSI feedback is not available. It uses frequency diversity by transmitting control signal over multiple PRB pairs across the full system bandwidth.

 

 

example where EREG group 0 consists of EREG 0, 4, 8, and 12 from different four different PRB pairs.

 

 

위 그림에서 eCCE(M)#13은 그림에 나와있는 부분이 eCCE#13인 것 뿐이고 eCCE는 distributed에서도 0~15까지 있음!! (statement는 안찾아봤지만 정황상 그럴듯!)

 

 

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RRC