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How UE will calculate the SFN and SF in which it will receive the SIB's.

+4 votes
How UE will calculate the SFN and SF in which it will receive the SIB's.
posted Apr 21, 2014 by anonymous

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2 Answers

+1 vote

Once the UE synchronized with eNodeB, it come to know SFN from MIB, after that UE uses the received SFN number for the calculation of subsequent SFN and SF.

answer Apr 22, 2014 by Harshita
+1 vote

Radio Frame on which UE will receive the SIB can be calculated as:

SFN mod T = FLOOR(x/10)

Subframe on which SI window will start for the corresponding radio frame is

 a = x mod 10
 value of x = (n -1) * w

n - number which represents the order of entry in scheduling info list.
For Example:-
For SIB2, n = 1
For SIB3, n = 2 and so on
w - SI window length ( 20 ms in our case)
T - SI periodicity of the corresponding SI message

Now lets calculate for SIB3:

Subframe from which SI window will start for SIB3

x = (2 - 1) * 20 = 20

a = 20 mod 10 = 0

so, the SI window will start from subframe 0 for the corresponding radio frame.

Radio Frame on which SIB3 will come

SFN mod T = FLOOR ( x /10 )

T = rf64 = 640 ms

SFN mod 640 = FLOOR ( 20 / 10 )
SFN mod 640 = 2

So, SIB3 will come on the radio frame for which SFN mod 640 = 2. UE will start looking for SIB3 from subframe number 0 of radio frame till the end of window length.

answer Apr 22, 2014 by Maninder Bath
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