LTE Introduction

  • Long Term Evolution (LTE) has been designed to support only packet-switched services.
  • It aims to provide seamless Internet Protocol (IP) connectivity between user equipment (UE) and the packet data network (PDN),without any disruption to the end users’ applications during mobility.
  • The term “LTE” encompasses the evolution of the Universal Mobile Telecommunications System (UMTS) radio access through the Evolved UTRAN (E-UTRAN)
  • it is accompanied by an evolution of the non-radio aspects under the term “System Architecture Evolution” (SAE), which includes the Evolved Packet Core (EPC) network. Together LTE and SAE comprise the Evolved Packet System (EPS).
  • Together LTE and SAE comprise the Evolved Packet System (EPS).
  • EPS uses the concept of EPS bearers to route IP traffic from a gateway in the PDN to the UE. A bearer is an IP packet flow with a defined quality of service (QoS) between the gateway and the UE.
  • The E-UTRAN and EPC together set up and release bearers as required by applications.
  • EPS provides the user with IP connectivity to a PDN for accessing the Internet, as well as for running services such as Voice over IP (VoIP).
  • An EPS bearer is typically associated with a QoS.
  • Multiple bearers can be established for a user in order to provide different QoS streams or connectivity to different PDNs.
  • A VoIP bearer would provide the necessary QoS for the voice call, while a best-effort bearer would be suitable for the web browsing or FTP session.

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