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Why LTE use frequency hopping only for Uplink?

+1 vote
Why LTE use frequency hopping only for Uplink?
posted Jan 5, 2015 by Chirag Gangdev

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1 Answer

+2 votes

Because SC-FDMA is used in uplink requiring contiguous RB allocation for a single UE, intra and inter-subframe frequency hopping can be applied to mitigate the impact of interference on specific sub-band(s). In DL, RB allocation can be done from across the band for a single UE, therefore no need for frequency hopping.

answer Jan 5, 2015 by Faisal Adeem Siddiqui
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+4 votes

Actually there are three resource allocation types being used to allocate resources to UE(s) in downlink and uplink. For downlink all three (Type 0, 1 and 2) used but for uplink only resource allocation type 2 is being used.

+6 votes

I have gone through spec 36.331.
"E-UTRAN only configures a single measurement object for a given frequency, i.e. it is not possible to configure two or more measurement objects for the same frequency with different associated parameters, e.g. different offsets and/ or blacklists".

why such limitations have been there ?