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LTE-Advanced: Should UE search for both PDCCH’s and E-PDCCH’s search space?

+1 vote

In release 11: When E-PDCCH is transmitted in PDSCH, does the subframe still allocate the same amount of resource for PDCCH?

posted Jun 17, 2014 by Pardeep Kohli

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1 Answer

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According to the requirement for LTE-Advanced to be backwards compatible to legacy LTE, when using the standard legacy carrier (radio frame structure), both the PDCCH and E-PDCCH shall coexist. This is due to the fact that the carrier need to support all the Rel. 8, Rel. 10 and Rel. 11 UEs. Because of the Rel. 8 UE, that does not recognize E-PDCCH, in order to serve them, the PDCCH need to be there. UE searches for the configured PDCCHs, i.e. if configured, it may use only PDCCH, or PDCCH (e.g. for SI reading, i.e. common search space) together with E-PDCCH (for dedicated resource scheduling – i.e. dedicated search space). For Rel. 11 the E-PDCCH is configured to be used for dedicated search space only (i.e. there’s no E-PDCCH including common search space – types of messages).

Taking a step further into the future, there are concepts for Rel. 12 and beyond to define a new carrier type (i.e. Lean Carrier), that would not include legacy Control Region with PDCCH, but only E-PDCCH with both common and dedicated search spaces. This concept is however under discussion.

answer Jun 18, 2014 by Nikhil Pandey
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+2 votes

When E-PDCCH is transmitted in PDSCH, does the subframe still allocate the same amount of resource for PDCCH?

+1 vote

An UE configured for carrier aggregation, may have different radio channel conditions for primary and secondary cells.
I meant to say, primary cell may have strong signal strength at the same time UE may observed secondary cell(s) not too good.
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I am preparing for interview, want to know all new features of LTE and LTE-advanced at eNodeB.

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