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  • RF Interview Questions Part 2 Answers

    Q01. What is LTE and Full form of LTE and it’s functionality?

    Ans. LTE (Long Term Evolution), LTE is a 4th generation wireless technology that offered increased network capacity and speed to mobile device user. Download speed 4 to 5 times faster than 3g network. It is flat architecture and using separate symbol techniques like for DL: OFDMA and UL:SCFDMA.

    Q02. LTE Architecture?

    Ans. Lte architecture characterised in 3 portion (i) UE (ii) E-UTRAN (iii) EPC     Please Click Here
    basic-LTE-Architecture-for-beginners

    Q03. What is the meaning of Interface? What is the interface name between UE to EnodeB?

    Ans. The Interface meaning is the way of connectivity between two network elements. And the interface name between UE and eNB is “LTE Uu”.  Lte Interface Click Here

    Q04. Need to remember UE to PDN all interfaces names?

    Ans. Refer answer 2 for LTE interfaces..

    Q05. When a UE perform cell re-selection in signalling (idle) then X2 using which Protocol?

    Ans. UE perform cell re-selection in signalling (idle) by using X2 AP (X2 Application Protocol) .

    Q06. When a UE perform handover in connected state, then X2 using which Protocol?

    Ans. UE performs handover in connected state by using GTPU (GPRS Tunnelling Protocol-User).

    Q07. What is name of Application Protocol & Transport Protocol in S1-MME interface?

    Ans. The name of Application Protocol is S1AP & Transport Protocol is SCTP in S1-MME interface

    Q08. What is the name of Application Protocol & Transport Protocol in S1-U interface?

    Ans. The name of Application Protocol is GTPU & Transport Protocol UDP in S1-U interface.

    Q09.Which protocol is using between MME to S-GW interface? Name of transport protocol of same interface?

    Ans. GTPC protocol is used between MME and SGW and the transport name is UDP and interface name is S11

    Q10. Which protocol is using in MME to EIR or HSS and why?

    Ans. Diameter protocol is used between MME, EIR and HSS because the work of EIR and HSS come under a AAA(Authentication, Authorisation and Accounting ) category, So as per 3GPP guideline Diameter protocol should be used for AAA elements.

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