LTE Interview QuestionsKnowing What to Ask

Long Term Evolution is something we have all heard of, and hopefully understand. It is a complex technology with hefty goals, and when fully launched will make our wireless experience faster and more efficient. But there still may be questions you have or you may be planning to further your LTE knowledge, and need to know which LTE interview questions to ask. To help you navigate, we’ve listed some of the most frequently asked questions, when it comes to LTE.  To make sure you feel confident and have an understanding at least at an introductory level, we’ve also provided answers to some of the most basic LTE-related questions. Here are some popular ones, according to LteWorld:

• What is LTE?

“LTE (Long Term Evolution) is initiated by 3GPPto improve the mobile phone standard to cope with future technology evolutions and needs.”

• What is goal of LTE?

“The goals for LTE include improving spectral efficiency, lowering costs, improving services, making use of new spectrum and reformed spectrum opportunities, and better integration with other open standards.”

• What speed  does LTE offer?

“LTE provides downlink peak rates of at least 100Mbit/s, 50 Mbit/s in the uplink and RAN (Radio Access Network) round-trip times of less than 10 ms.”

• What is LTE Advanced?

LTE standards are in a matured state, now with release 8 frozen. LTE Advanced, however, is still in the works. Often the LTE standard is seen as 4G standard which is not true. 3.9G is more acceptable for LTE. So why it is not 4G? The answer is quite simple – LTE does not fulfill all requirements of ITU 4G definition.

LteWorld provides a brief History of LTE Advanced: “The ITU has introduced the term IMT Advanced to identify mobile systems whose capabilities go beyond those of IMT 2000. The IMT Advanced systems shall provide best-in-class performance attributes such as peak and sustained data rates and corresponding spectral efficiencies, capacity, latency, overall network complexity and quality-of-service management. The new capabilities of these IMT-Advanced systems are envisaged to handle a wide range of supported data rates with target peak data rates of up to approximately 100 Mbit/s for high mobility and up to approximately 1 Gbit/s for low mobility.”

• What is LTE architecture?

“The evolved architecture comprises E-UTRAN (Evolved UTRAN) on the access side and EPC (Evolved Packet Core) on the core side.”

• What is EUTRAN?

The E-UTRAN (Evolved UTRAN) consists of eNBs, which provide the E-UTRA user plane (PDCP/RLC/MAC/PHY) and control plane (RRC) protocol terminations towards the UE. The eNBs are interconnected to one another by  the X2 interface. The eNBs are also connected by the S1 interface to the EPC (Evolved Packet Core), more specifically to the MME (Mobility Management Entity) by means of the S1-MME and to the Serving Gateway (S-GW) by means of the S1-U.

• What are LTE Interfaces?
• What are LTE Network elements?
• What are LTE protocols & specifications?
• What is VoLGA?
• What is CS Fallback in LTE?
• How does LTE Security works?
• What is IP Multimedia Subsystem (IMS)?
• How does measurements work in LTE?
• What is Automatic Neighbour Relation?
• How does Intra E-UTRAN Handover is performed?
• How does policy control and charging works in LTE?
• What is SON & how does it work in LTE?
• How does Network Sharing works in LTE?
• How does Timing Advance (TA) works in LTE?
• How does LTE UE positioning works in E-UTRAN?
• How many operators have committed for LTE?
• What is Single Radio Voice Call Continuity (SRVCC)?
• How does Location Service (LCS) work in LTE network?
• How does Lawful Interception works in LTE Evolved Packet System?
• What is carrier aggregation in LTE-Advanced?
• What is Relay Node and how does Relaying works in LTE-Advanced? [1]

To find more answers to these and other LTE-related questions, refer to the LteWorld FAQs, along with other LTE knowledge boards/blogs/sites/etc. You may have many LTE questions, but the answers are out there.