LTE: What happens when mobile switched on? | Cell Search Procedure in LTE

Thanks for watching my Channel ATS. LTE: What happens when mobile switched on? | Cell Search Procedure in LTE
In an LTE system, two types of synchronization signals for cell search: primary synchronization signals (PSS) and secondary synchronization signals (SSS). The cell search procedure is as follows: A UE monitors the PSS to acquire slot synchronization accurate to within 5 ms, and to identify the cell number
1. After powering on, UE scans all the supported bands one by one to synchronize with the available cell. Each cell transmits broadcast information at fixed place (middle 6 RBs of each band) irrespective of configured bandwidth(10 MHz, 20 MHz).
2. After Primary and Secondary synchronizations, UE gets the MIB information and other SIBs information based on location of PDSCH. System Information blocks are transmitted through PDSCH and location of PDSCH in a subframe is find out based on PCFICH, PHICH and PDCCH.
3. LTE system supports various types of system information blocks which broadcast different kind of system information. Based on 3GPP release compliance, a cell may broadcast different additional SIB. However a cell supports # of PLMN is found based on SIB1.
4. After getting SIB1 and SIB2 (common RACH chanel information), UE triggers RACH procedure towards eNodeB. RACH preamble is sent by UE to eNodeB using the PRACH and UE gets the RACH Response (success/failure) on PDSCH.
5. Assuming RACH response was successful then it sends RRC Connection Request message to eNodeB. It sends RRC level UE identifier and rrc connection establishment cause.
6. In successful case, eNodeB configures its lower layer and create UE context and responds to UE with the RRC Connection Setup.
7. If UE accepts the RRC Connection Setup and then it sends RRC Connection Setup Complete with the piggybacked NAS message to eNodeB. Once eNodeB receives RRC Connection Setup Complete, it moves UE state from RRC-IDLE to RRC-CONNECTED.
8. eNodeB forwards the received NAS message i.e Attach Request to MME using "Initial UE Message".
9. In attach request UE sends IMSI and MME fetch the UE subscription profile from HSS by using S6a interface defined procedure.
10. MME performs authentication and security procedure at NAS level with UE. After successful execution of these procedure, MME executes Create Session Procedure and gets the IP address and other details from PGW/PCRF.
11. After getting Create Session Response, MME prepares "Attach Accept" and send to UE by using "Initial Context Setup Request" procedure.
12. Once eNodeB receives "Initial Context Setup Request" from MME, it is successful response of "Initial UE Message" which it sent earlier.
13. If eNodeB does not receive UE radio capability from MME in "Initial Context Setup Request" then it performs radio capability exchange procedure with UE and after getting UE radio capability information, it updates to MME for the same so that MME can re-use this information next time.
14. After UE radio capability exchange, eNodeB activates radio security with UE.
15. After successful activation of radio security, eNodeB configures its lower layers for SRB2 and DRBs. It prepares "RRC Connection Reconfiguration" and sent to UE. One more thing here to note that receives "Attach accept" message is piggybacked in this RRC Connection Reconfiguration Message.
16. UE responds with RRC Connection Reconfiguration Complete message to eNodeB and eNodeB responds to MME with "Initial Context Setup Response". Initial Context Setup Response carries GTP tunnel end of eNodeB and MME communicates about eNodeB side tunnel end points so that SGW can forwards downlink packets of UE to eNodeB.
17. Finally "Attach Complete" NAS message is sent by UE to MME.
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[@AnandTechnoSolutions]

Please Support me by Subscribing MY Channel..Thanks

[@NavinKumar-iu2yh]

Good explanation bro, Always use english to reach more subscriber and likes.

[@nitsr6053]

District motihari se ho bhai?

[@prashantsharma4459]

Sir...request u to plz upload one video for cell reselection with complete log analysis

[@AN-dm2hw]

Thanku sir...u r very knowledgeable person...apke videos se kuch na kuch naya jarur janne ko milta hai
Agar ap segmentation aur concatenation log ke through samjhaye to bahut help hogi

[@AnandTechnoSolutions]

Surw

[@iamswastik]

Very good explanation with example. Thanks

[@AnandTechnoSolutions]

Hanks subhoraj

[@puliraju9222]

Excellent Anand ji.well said...clear understanding. Tq for knowledge sharing

[@AnandTechnoSolutions]

Thanks raju

[@yo_jimmy_channel6851]

Hi anand bhai, Nice information and excellent presentation.
I ll love to see more videos from your side.
Thank you.

[@AnandTechnoSolutions]

Thanks smruthi bhai

[@KMMIGA74]

Thanks and appreciate fornsharing this information

[@falguni.bonaparte]

Thank you so much Sir, this is really nice description and you have made it interesting and engaging, with proper speed of communicating.

[@AnandTechnoSolutions]

Thanks.jai hind

[@sriramjha9749]

Thank you bhai. bahut achha laga video

[@AnandTechnoSolutions]

Thanks sriram jha

[@rajasuryawanshi391]

Hi Anand: It's really a very good video, presentation and explanation. Keep posting.
My personal request to make some videos on at eNB / Network side
1. Protocol Testing Lab Setup
2. Emulator / Simulator
3. Log Formats, Opening the Logs, and Decoding
4. Troubleshooting of Bug..

[@sameerkv5820]

Good explanation dear.... Keep posting videos. And do next part of this video.. use English....

[@AnandTechnoSolutions]

Thanks sameer,My all video and next future video will be in eng+hindi...Jai Hind

[@9135451922]

Thank you sir for the good explanation.

[@AnandTechnoSolutions]

You are welcome

[@bharani253]

Nice explanation

[@AnandTechnoSolutions]

Thanks

[@sureshm8289]

Very helpful Sir, thanks lots for the knowledge sharing and for your efforts:):):)

[@AnandTechnoSolutions]

So nice of you

[@shubhamtyagi8356]

hi,
How is E-ARFCN used in deciding the frequency range in which UE have to search SSB?

[@AnandTechnoSolutions]

Sab concept in 5g

[@kommanayashwant1478]

Thank You..for the lecture..
Good explanation...
Please take class on log analysis as well... 😊

[@AnandTechnoSolutions]

Sure hanks

[@sivakrishnareddy3580]

Excellent bro... very good explanation...

[@AnandTechnoSolutions]

Thanks

[@souravbiswas2356]

Anand bhai RACH procedure after power on v bataiyega

[@srikanthmadugula7751]

Excellent bro thank you it's very helpful

[@AnandTechnoSolutions]

Thanks

[@arunkrbaidya6377]

Hi Anand: It's really a very good video, presentation and explanation. All info are correctly explained. Keep posting.
My personal request to make some videos on 9at eNB / Network side)
1. Protocol Testing Lab Setup
2. Log Capturing
3. Log Formats, Opening the Logs, and Decoding
4. Troubleshooting of Bug
5. Emulator / Simulator
6. Test Case Writing
Thanks,
AB.

[@AnandTechnoSolutions]

Thanks arun bhai

[@nagurusangadi2932]

Nice explanation..But please try to use English bro...

[@jagadeeshdontula7328]

Can you explain , organised into 168 pci groups only ?

[@ManiKumar-wm3su]

DBS is derived band search which is based on CCF(cross correlation function) which gives specific range of frequency to trigger freq search, for whole band FBS(full band scan) is used. Let me know if I am wrong. Otherwise very informative.... :)

[@AnandTechnoSolutions]

Correct

[@ManiKumar-wm3su]

@@AnandTechnoSolutions You are doing great job Anand.....keep posting such kind of videos.

[@AnandTechnoSolutions]

@@ManiKumar-wm3su Thanks Mani

[@bmuralikrishna8054]

Thanks a lot for this video. Really very helpful.
Just have a query about the point explained in this timestamp 10:40
--> 31 subcarriers are for PSS & 31 subcarriers for SSS.
Just wanted to know if this is a typo. Because when I see the LTE resource grid Image, all the 62 subcarriers of a slot I can see PSS & SSS. The same thing I can see in the Image you are explaining. Please help me by clarifying this doubt.
Once again thanks for the video...

[@AnandTechnoSolutions]

Correct it's typo

[@shyamsinghpal3755]

Please let me know if any classes for 5G by you...I want to join

[@lte_ue_testing4688]

In step 2 after RSSI scan it filter the frequency through plmn by physical layer

[@AnandTechnoSolutions]

Thans piyush

[@singlestar2529]

When exactly PLMN search starts? Is it after MIB decoding?

[@AnandTechnoSolutions]

Please fllow the video

[@gururaghavendraraghava5756]

Hi Anand,
i have a doubt why PSS is read first instead of SSS

[@AnandTechnoSolutions]

Hmmm..

[@sumitpatel5367]

what is trheshold value of RSSI in step 2

[@AnandTechnoSolutions]

Thaks sumi

[@priyankapriyadarshinee8941]

Plz make video on PDCP layer and operation after RLC

[@AnandTechnoSolutions]

sure

[@manishtestingid955]

Hii Anand,
Very Bug thank to you for this informative video.
Pss/SSS/RS........Step 3 is looks like very complicated..if possible then can you please help to make it more clear.
Thanks

[@AnandTechnoSolutions]

Yes step3 is complicated you need to watch 3 to 4 times..then may be it will clear

[@shyamsinghpal3755]

Super 👌

[@vikramthakur7913]

Hi Anand, Thanks for making a very informative and easy to understand video with precise information. Please keep on posting such videos, these are really very helpful for all of us.
Can you pls explain slot boundary info ue will get after pss decoding and frame boundary after sss? What exactly boundary means here. However SFN ue is getting from MIB as well. Pls reply.

[@AnandTechnoSolutions]

ThanksVikram

[@gobi7648]

May I know when Random access procedure will happen

[@kurapatisrikanth8455]

Hi sir,
Actually if we see in a subframe sss is placed first means TS 0 0sf and 5sf -6 SYMBOL and the pss is last in a sf means TS 0 0sfAND 5sf last symbol but ue will read pss first how it is possible and y pss and sss is being sending in two times for every ten slots

[@nammurushivamogga]

To check the frame boundary sss will be different. And pss will same for all the group. Correct me if i am wrong??

[@TheAbdulj6]

What is threshold value of rssi

[@BKD743]

Hi, I am unable to see your videos and only audio sound is coming. Plz check

[@AnandTechnoSolutions]

Thanks chandan

[@subhranshuhazra1717]

Thanks Anand

[@priyankapriyadarshinee8941]

Plz make video on RLC layer operations, modes, state variables, etc.

[@satviksharma6102]

is cell search for 4G and 5G is same??

[@mithun8916]

Good one..

[@AnandTechnoSolutions]

Thanks mithun

[@TheAbdulj6]

31 pas and 31 sss???

[@AnandTechnoSolutions]

62...out of 72 subcarrier

[@007mockingbird]

very good

[@Mirza.hyider]

Good explanation but very fast.

[@r.dineshkumar3984]

Really super

[@AnandTechnoSolutions]

Thanks

[@Emberdash_890]

much thanks

[@AnandTechnoSolutions]

Thanks

[@mohammedsamad1069]

Bro just continue on only ip protocol testing

[@AnandTechnoSolutions]

sure..

[@AtoZContentkj]

💓

[@BM-ry5po]

English to understand you