After reading PSS, SSS, why UE reads Reference Signals before reading PBCH?

4G LTE
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1

After reading PSS, SSS, why UE reads Reference Signals before reading PBCH?
What is the role of Reference Signals here?

2

By reading RS UE came to know usable PBCH which can be uses to decode MIB.
Open resource grid, calculate total no. Of RE’s in PBCH then subtract RS count from there. Eg PBCH total RE’s = 724= 288. Re’s used by RS = 68=48 SO total 240RE’s used by enb to send PBCH over which other operations performed like rate matching, modulation etc see sharetechnote for more info.

Let me know if still have query.

3

@kishore_manthri
Signals (PSS , SSS and RS) are detected. Channels ( PBCH , PDCCH , …) are decoded

In order to decode, UE has to perform channel estimation which is the role of RS

4

Hi everyone,
which reference signals are read after SSS . after reading those reference signals on what factors channel estimation is done.

Thanks,
Kishore

5

thanks for info @O.B & @Saurabh63 .can you please explain about channel estimation if possible