What is frequency acquisition procedure in LTE?

Question

I don't have depth knowledge related to system information broadcasted in a cell. I was going through RRC specification 36.331 but could not understand all the terms like SI-window . I also could not understand of calculation of x = (n-1) * w, a = x %10 and so on.
Can someone please explain all the concepts in detail with an example ?

Answer 1

If I am correct, it is same as cell search procedure.

Comments

Hi Harshitha Madam...Plz clarify the following things....at ur mean time


Which process happens first RACH Process, PSS & SSS Synchronization, PLMN Selection or CELL Selection/Reselection?, frequency acquisition.....

Please provide the order also.

My Doubt

IN ORDER FOR PLMN SELECTION TO HAPPEN UE GETS BROADCASTED INFORMATION AND WILL READ MIB AND SIB1 (CONTAINS PLMN IDS)

FOR PSS AND SSS PROCESS TO HAPPEN, THIS INFORMATION WILL BE IN 1ST AND 11TH SLOT OF FRAME FOR PSS AND PSS PRECEDES SSS. THESE ALL NOTHING MEAN TIME , FRAME SLOT LEVEL SYNCHRONIZATION.

BUT THESE FRAME AND SLOT WORDS COMES IN SFN (WHICH IS IN MIB) WITHOUT READING MIB HOW PSS AND SSS HAPPENS.

AND IF WE SAY SYNCHRONIZATION HAPPENS WHEN UE IS SWITCHED ON AFTER FREQUENCY ACQUISITION. HOW IS THAT AFTER FREQUENCY ACQUISITION, SYNCHRONIZATION IS HAPPENING.


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As someone mentioned to me that this.......

[ For UE to read MIB and SIBs . UE has to be : Frame Synchronized, should know the Time Slot and very important this is that it should know the Physical Cell ID. All these things UE gets from PSS and SSS.
Only After that UE reads MIB and SiBs followed by RACH ]


Frame synchronized in the sense are u talking about system frame number.....

My knowledge is that

After getting MIBs and SIB1 only UE can be able to complete  PLMN selection...before PLMN....cell search and frequency acquisition process happens.....

in order for FRAME Synchronized , time slot n PSS and SSS to complete before MIB and SIB1 reading ,
and more to say plmn selection...

will UE try to sync (frame n slot level) with all carrier(eg ; airtel,idea,vodafone,aircel service providers ) bands it can be of capable...and later after plmn selection it goes to that particular carrier.....


PSS info will be sent on 1st and 11th slot of each frame.....so for frame synchronizaton and time to complete without reading MIB.....from where does UE get this information.....


My view is that after reading MIB which contains SFN.....and  SIB1(for selecting particuar network) it completes. PSS and SSS..

Correct me if i was wrong ...i have written wat i thought of.....

correct me briefly.....by analyzing the way i got back to you...

take your own average time to respond back...

if u say radio frame and system frame....what exactly u define about them

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MOBILE ON,
1. Frequency acquisition
       under this 1.1 EARFCN scan and PLMN search (first time UE in network)
                        1.2 SLS scan (BAND scan) and DBS scan (UE already in network)
2. Frequency sync (PSS) and Time sync (SSS)
3. Reference signals (RSSI, RSRP, RSRQ, based on SINR)
4. MIB (fixed information)
     It provides Bandwidth information, Antena Availability info, PHICH info
     PBCH-BCH-BCCH
5. SIB (Variable info)
    -12 type of info
    - PCFICH-PDCCH-PDSCH (CFN)
    - PDSCH-DLSCH-BCCH