LTE Call Flows

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LTE Call Flows 7


  1. This is very good article simple and elegant illustrations!!!

  2. very usefull site and article.comfortable and easy interface!!!A+

  3. this is very helpful, thank you

  4. I have seen many good blogs and websites for LTE , I must say the way you have presented your stuff , your this tool is just one of the best !!

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  6. I have a confusion , couldnot understand why we have again RRC connection procedure and repeatition of some other subsequent messages in last ladder diagram of "service request" ? you mentioned in last message (modify bearer response) of "default bearer attach 2" that SGW is now ready to send DL data to enodeb over S1 ,
    then why again these steps in last section of "service request" ?

    1. UE initiates "SERVICE REQUEST" when it is in EMM-REGISTERED but ECM-IDLE state and has some data in uplink to be sent or it has received paging from CN.
      RRC connection establishment is the process of establishing ECM connection.
      So befor UE can send "SERVICE REQUEST" to CN, it need to move to ECM-CONNECTED state and for this UE needs to perform cell selection/reselection.
      This will involve the following steps:
      Synchronization==>RACH==>RRC Connection Setup==>Bearer Establishment.
      That is why you are seeing the message repeated in case of service request.

  7. It is highly appreciated . many thanks .

  8. Hi,

    Call flow part not opening . only showing --Please Wait..Loading may take couple of seconds..

    Please check.. call flow is very useful

  9. The messages in explanation should be with channel assignment or the arrows for DL or UL should have channel info for better explanations. Thanks

  10. It is highly appreciated.................

  11. Something new is all loved and interesting to read as what I Got under this space is a true wireless support service technology. We are in this world and able to communicate because of wireless technology and in the future in this sector huge growth and everyone gets new hi-tech wireless technology.