LTE/EPS Technology

The 3GPP evolution for the 3G mobile system created the new base station system, called Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) and a new core network, called Evolved Packet Core (EPC) as a result of two standardisation projects: Long Term Evolution (LTE) and System Architecture Evolution (SAE). Under these specifications a mobile phone gets access to higher bandwidth with low latency in an improved and more efficient network architecture. The standards define an all-IP network as a base for the E-UTRAN/EPC. The E-UTRAN/EPC does not have a separate PS data traffic and CS voice network, both communicate over the same new Evolved Packet System (EPS) network. LTE/EPS Technology course is an intermediate technical course, which covers all aspects of architecture and functionality of the EPS.

Target audience

The course is intended for technical GSM/UMTS staff and their management who plan to or already work on introducing LTE/EPS network.

Training contents

  • Introduction
    (3GPP mobile network evolution, requirements for the LTE system),
  • Network architecture
    • EPC - Evolved Packet Core
      (MME -Mobility Management Entity, S-GW - Serving Gateway, P-GW - Packet Data Network Gateway, HSS - Home Subscriber Server, EIR - Equipment Identity Register, PCRF - Policy and Charging Rules Function),
    • E-UTRAN
      (UTRAN and E-UTRAN architecture comparison, evolved Node B - eNB, the need for eNB-eNB X2 interface),
    • Architecture for interworking with GERAN/UTRAN
      (SGSN - Serving GPRS Support Node, interfaces: S3, S4, S12 and one tunnel option),
    • Architecture for roaming
      (user traffic routed to the HPLMN, local breakout),
    • Architecture for interworking with non-3GPP IP access (WLAN, WiMax)
      (trusted and untrusted non-3GPP IP access, ePDG - evolved Packet Data Gateway, AAA - Authentication Authorisation and Accounting),
    • Interfaces and protocol stacks
    • Geographical network structure
      (TA - Tracking Area and TA list registration),
    • Identity numbers
      (IMSI, MSISDN, IMEI, PDP address, GUTI, S-TMSI, M-TMSI).
    (multiple access technologies, FT - Fourier Transform and DFT - Discrete Fourier Transform , orthogonality of frequencies, channel separation in FDMA and OFDM, transmission example, implementation, advantages and disadvantages of OFDM, OFDMA, SC-FDMA),
    • Duplex mode
      (FDD and TDD),
    • Frequency bands
    • ICI - Inter-Cell Interference
      (ICI randomization, cancellation, co-ordination/avoidance),
    • Basic time structures and parameters
      (resource grid, resource block, radio frame, reference symbols),
    • MIMO - Multiple Input Multiple Output
      (multiple antenna systems, reference symbols from multiple antennas, MIMO channels estimation),
    • Channels
      (radio, physical, transport, logical channels and their characteristics, UTRAN and E UTRAN channel comparison),
    • Transmission process
      (link adaptation, HARQ, scheduling).
    • LTE-Uu protocol stack
  • Core network
    • MME in Pool
      (pool area, MME selection and addressing, load balancing, overload control),
    • Signalling Transport - SIGTRAN
      (SCTP, multihoming, streams, stream oriented / message oriented protocol - comparison, security, SIGTRAN in GSM/UMTS / SIGTRAN in EPS - comparison),
    • User data transport
      (tunneling concept, GPRS Tunneling Protocol - GTP, tunnel establishment),
    • Diameter
      (3GPP Diameter applications, Proxy/Relay agent),
    • QoS
      (EPS default bearer, EPS dedicated bearer, bearer establishment, QoS parameters, exchange of QoS related parameters between EPS and service network).
  • Policy Control and Charging - PCC
    (PCC in UMTS R5-, R6 and UMTS/EPS R8, Policy Decision Function - PDF, Charging Rules Function - CRF, Policy and Charging Rules Function - PCRF, interaction with services, flow based charging and policy control),
  • Traffic Cases
    (EMM, ECM and RRC states, attach procedure, TA update, UE/network triggered service request, S1 release procedure, dedicated bearer activation, UE requested bearer resource allocation, handover, intersystem handover, Idle mode Signalling Reduction - ISR),
  • Security
    (EPS Authentication & Key Agreement - EPS-AKA, key hierarchy, ciphering, integrity protection),
  • EPS Management
    (Self Organising Network - SON, eNB establishment, optimisation of the neighbourhood list, coverage and capacity optimisation, continuous optimisation due to dynamic changes, handover optimisation),
  • Services
    (IMS - IP Multimedia Subsystem, network architecture, identification, QoS, protocols, IMS discovery, registration, security procedures, mobile-to-mobile call, mobile-to-PSTN call, presence service, push-to-talk over cellular, instant messaging, session based messaging, SMS, VCC - Voice Call Continuity, SR-VCC Single Radio Voice Call Continuity),
  • CS Fallback and SMSoSGs
    (MSC-MME interworking, combined IMSI/EPS Attach, combined LA/TA update, CS call, SMS, other CS services).


The participants should have attended the following courses for better understanding: "UMTS Technology" or "WCDMA Air Interface", or have the equivalent knowledge on UMTS.

Training method



2 days