SFR vs FFR

[s.sunilpal123]

Hello,

Can u pls explain what is the difference between SFR(Soft Freq reuse) & FFR)Fractional FR) , their advantages & why do they have those advantages..?

Are both used in LTE?

I would be very grateful...Rep n thanks assured!!

[mimoX]

Can u pls explain what is the difference between SFR(Soft Freq reuse) & FFR)Fractional FR) , their advantages & why do they have those advantages..?

the general principle almost the same. to use max bandwidth at near end and 1/3 at far end.
>FFR was earlier introduced in WiMax.
>SFR later in LTE.
advantage
>to increase capacity/ throughput for near end (by utilizing full bandwidth)
>to reduce interference at far end (cell edge) by utilizing 1/3 of bandwidth.

Are both used in LTE?

SFR>>LTE
FFR>>WiMax

[MINTO]

Hi...Both are different
Similarities

• Separate by the frequency domain / time domain for interference cancellation
• Cell centers use more bandwidth resources, cell edge use of about 1 / 3 frequency bands,
difference

•FFRuse all the sub-carrier in cell center, SFR use 2/3 sub-carriers

•In DL/UL, FFR same reuse mode,, SFR use different mode

•DL Tx Power: SFR: cell center is lower than cell edge; FFR: cell center is same with cell edge
•UL frequency resource: FFR mode, in cell edge, fixed use 1/3 of the frequency band; In SFR mode, cell edge use partial band, normally near 1/3 of the frequency.

[raednoor]

FFR 1*3*1
All BTSs use one frequency point, which on one hand, ensures the coverage and use partial sub-carriers on the cell edge; on the other hand, increases spectrum usage and use all sub-carriers near the BTS.

Advantages:

• Use the single frequency point networking, which can implement soft handover.
• The spectrum efficiency is high, and the sector capacity is large.
• Subchannel scheduling is flexible. Use excellent sub-channel scheduling mechanism to use frequency resources to the maximum extent.

Disadvantages:

• The complex sub-carrier replacement mode and sub-channel scheduling algorithm are hard to implement.
• The system interference level is related to the quality of the subchannel scheduling algorithm.

Applicable Scenario:

• For initial network construction of dense urban areas and areas of middle or high traffic.
• This networking mode can be used as expansion solution of single frequency point 1*3 reuse mode.
• This is the preferred networking mode.

PUSC 1*3*1

All BTS use one frequency point. Three sectors of a BTS is a reuse cluster. The three sectors use respectively 1/3 sub-channel in a frequency point. The same directional sectors of different BTSs use the same subchannel.


Advantages:

• The entire network enjoys co-channel. Soft handover can be implemented.
• Do not need complex scheduling method of sub-carrier replacement mode. The implementation is easy and the system expense is small.
• The system interference is small. There is no subchannel conflict between adjacent sectors of a BTS.
• The coverage range is wide. Cost of initiall network construction is low.
• Network construction is fast. The interference is easy to be controlled, and the network planning and optimization are simple.

Disadvantages:

• The spectrum utilization is low.
• Network Capacity is small.

Applicable Scenario:

• Adapt to initial network construction.