LTE – Tips for Basic Procedures

5 Aug
 Most of  us would be specialized in one or a few specific area/layer as an engineer. Technically it is understandablebecause not a single person can master everything, but I strongly recommend you to try to have some big picture of the whole process. Whenever you have some issues or something for you to work, try to ask your self “Where is thecurrent issue located in the whole picture ?”.You don‘t have to try rote memorization for these whole process, but if you keep trying to map your current issues tospecific parts within the whole picture, these whole sequence would automatically pops up in your memory. I say sooften to my kid or my juniors “Don’t try to memorize it, just repeat it until you automatically recall” (They are looking atme seeminly saying “What is the difference ?” -:) I just smile -:). Following is my version of the whole LTE procedures.. but if you are trying to describe it, you would have a little bitdifferent version.. but I think overall logic would be similar. Every now and then, just try to recall these sequence inyour mind and ask your self “how in detail I can explain about each of these steps ?”. Actually each of these steps canbe described in a volum of a thick book. i) UE is Off ii) Power On UEiii) < Frequency Search >iv) < Cell Search > : Normally a UE would find multiple cells in this processv) < Cell Selection >vi) MIB decodingvii) SIB decondingviii) < Initial RACH Process >ix) < Registration/Authentication/Attach>x) <Default EPS Bearer Setup >xi) Now UE is in IDLE Modexi) <(If the current cell become weak or UE moves to another cell regisn) Cell Reselection>xii) <(When Paging message comes or User make a call) RACH Process>xiii) < Setup Dedicated EPS Bearer >xiv) Receive dataxv) Transmit dataxvi) (If UE power is percieved too weak by the network) Network send TPC command to increase UE Tx Power




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