[Discuss-gnuradio] How to compute value of packet_len for LTE signal

Hi,
I am working on tx_ofdm.grc file for generation of LTE uplink
signal for fft_len 128. I want to know what will be the value of
packet_len or how to compute values of packet_len/length_tag_key for
the same.
I am using parameters as follows:

occupied_carrier----(range(-61,-42)+range(-41, -14) + range(-13, -7)
+range(-6, 0) + range(1, 7) + range(7, 14) + range(15,
42)+range(43,62),)

pilot_carrier--((-42, -14, 14, 42,),)

pilot_symbol--(((-1+1j),(1-1j),(-1+1j),(-1-1j),),)

As I am getting output for any value of packet_len, how to check
whether it is correct or not??


Thanking You,
Prabhat

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