Part-#1|5G NR Cell Search Process in Stand alone mode Part-#1|After UE switch on cell search process

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LTE Cell Search Video Link:::
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When you first power on the device or your device got into out of coverage and try to detect/search a new cell, UE does not have any idea on which frequency it has to try camp on.
So it may have to do some kind of blind search.
For example,
· UE is off.
· Power On.
· Scan all the frequency.
Here two type of frequency scan: a) SLS ii) DBS
SLS: Storage List Search: Its check and Scan those frequency which was stored in mobile before switch on.
DBS: Deviated Band Search: If after SLS search UE didn’t find any cell then UE will start DBS Search where UE will scan all the frequency for whole band.
For example, let's assume that your device support 5G Band n1, n2, n20. *#0011# or *#2263#
The eNodeB around your UE may use any frequency channel from nr-arfcn range (422000, 434000) FDDBand-n1, nr-arfcn range (158200, 164200) for FDD Band n20 and nr-arfcn range (386000, 398000) for Band n2.
There can be lot of possibilities of frequencies that eNB would use. Then how UE can detect/find the cell (NodeB) it would camp on?
Step-1) UE tune to each and every channel that it supports and measure RSSI. (RSSI is simply a measurement of whatever energy/power it can measure. This measurement does not require any channel coding process. So, at this step, UE does not need to know anything about the network. At this step, UE does not try to decode PCPICH (in WCDMA) or Sync/Reference Signal (in nr-5G) to detect Physical Cell ID. It just measures the power of each channel.) As UE measure RSSI for each channel, it creates a list of each channel numbers with the measured RSSI.
Step-2) Then UE go through the list from Step-1) and figure out all the channels which shows RSSI value greater than the threshold (this threshold is also up to UE/chipset implementation, not determined by 3GPP).
Then the question would be "Any frequency with Passing RSSI value can be the one that UE can camp on?” The answer is "Not Necessarily".
Step-3) This Step is little Complicated so it will take time to understand complete process. UE do synchronization process followed be PSS and SSS and decode reference signal and detect physical cell ID from each candidate from Step-2).
(Some candidate gives successful result but some would not. UE make the list of all the successful tries).
i) Now from Step-2) list, One by One UE will start synchronization process for all frequency.
ii) In above log we can see 1st preferred earfcn is 386670. So UE will scan nr-arfcn 386670 and will try to get suitable SSB.
iii) Actually, for both FDD and TDD network broadcast synchronization signal in downlink direction and this synchronization is primary and secondary synchronization signal. By using PSS and SSS UE would find multiple cells in this process.
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[@PawanSingh-vi3em]

superb very vivid and nice explanation

[@AnandTechnoSolutions]

Thanks

[@rockman8638]

Very informative waiting for next video..

[@AnandTechnoSolutions]

Thanks Bro

[@ATUS1213]

Thanks Anand boss! This time was waiting for your informative video for long time 😀👍🏻

[@AnandTechnoSolutions]

Thanks Man

[@manjegowdak.r.9771]

Great video brother; waiting for the next part..

[@AnandTechnoSolutions]

Thanks bro

[@sixtybajaj]

Well done Bro. Very nice explanation. One of the best I would say.

[@AnandTechnoSolutions]

Thanks bro

[@varun284]

Excellent...........Anand ji Please 5NR ki end to end KPIs and counter par bhi video banaye with solution.

[@AnandTechnoSolutions]

Thanks

[@anuragmanitripathi3181]

Wonderful Explanation

[@AnandTechnoSolutions]

Thanks ji

[@sridharm303]

Excellent explanation.

[@houseoforganic2756]

Very nice 👍

[@pidstersh9433]

Very good video. Thx for clarification. When is next video for 5G SA cell selection ?

[@AnandTechnoSolutions]

Thursday 2PM

[@sandeep8422]

Thank u boss 👍👍

[@AnandTechnoSolutions]

Thanks

[@MdIsrar-uk8xx]

Well explain sir

[@prakashdangi7261]

How does ue know whether to use 15 ,30 or 60khz subcarrier spacing to read SSB? In LTE only one subcarrier spacing but in nr there are options and also FR1 and FR2 In ENDC case LTE nodeb sends these information in rrc reconfigurations msg but in case of SA how ue know?? Please answer thank you

[@jitendrapandey4371]

Where i know it use GSCN no to find out SSB position, GSCN no are defined as per band.

[@rameshlaxmiraj]

Nice but u did not explain where and how to decode SSB block and what is Synchronization Raster. At the last u have explained about LTE but noy NR SA

[@AnandTechnoSolutions]

This is Part-1...In Part-2 You will get your Answer

[@AdarshKumar-ek1xd]

Hi, thanks for the video. Very well explained. I got a doubt, How does UE determines first preferred NR-ARFCN which you mentioned at 7:40. Please explain in both cases when UE is powered on for the very first time and UE is coming out of coverage area. Thanks.

[@ATUS1213]

Argon 386670 has the higher RSSI compare to other two freq at step 2. So it is first preferred arfcn UE will try to sync with using SSB.

[@AnandTechnoSolutions]

@ATUS1213 correct

[@nitinjain1429]

When UE power on first time how it understand it has to follow 3G or 4g or 5G initial acquisition incase ue has auto selection mode is on and all RATs are enabled in wireless settings option

[@AnandTechnoSolutions]

tweet4technology.blogspot.com/2019/10/lte-cell-search-procedure.html it will help you to understand what happens during initial Acquistion.

[@chobey007]

Hi, I tried alot but didn't find answer. How UE will know NR network is TDD of FDD. Like LTE, we come to know from PSS and SSS slot.

[@bmuralikrishna8054]

Excellent video sir. Very informative. Waiting for part - 2. Are you providing any paid online classes for people who doesn't have knowledge on 5G? If yes, could you please let me know the details. Thanks.

[@AnandTechnoSolutions]

Thanks Bro, Sure..No Online Class. For other informative video you can "join" Membership

[@chandrashekarsr2100]

Tq for vid

[@nitsr6053]

Sir 5g prach ke bare me btaiye

[@AnandTechnoSolutions]

Thanks Nitis

[@janejones9270]

vay.fyi cracking