TelecomStudy18

The X2AP protocol is used to handle the UE mobility within E-UTRAN and provides the following functions: ·          Mobility Management ·          Load Management ·          Reporting of General Error Situations ·          Resetting the X2 ·          Setting up the X2 ·          eNB Configuration Update Protocol specification 3GPP TS  36.423  - Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)

  The main functions of X2 interface layer 1 are as following: ·          Interface to physical medium; ·          Frame delineation; ·          Line clock extraction capability; ·          Layer 1 alarms extraction and generation; ·          Transmission quality control. Protocol specification 3GPP TS  36.421  - Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 layer 1

S1 signalling bearer provides the following functions: ·          Provision of reliable transfer of S1-AP message over S1-MME interface. ·          Provision of networking and routeing function ·          Provision of redundancy in the signalling network ·          Support for flow control and congestion control L2 - Data link layer Support of any suitable data link layer protocol, e.g. PPP, Ethernet IP layer ·          The eNB and MME support IPv6 and/or IPv4 ·          The IP layer of S1-MME only supports point-to-point transmission for delivering S1-AP message. ·          The eNB and MME support the Diffserv Code Point marking Transport layer SCTP is supported as the transport layer ...

the main functions of S1 interface layer 1 are as following: ·          Interface to physical medium; ·          Frame delineation; ·          Line clock extraction capability; ·          Layer 1 alarms extraction and generation; ·          Transmission quality control. Protocol specification 3GPP TS  36.411  - Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 layer 1

·          Low Rx level DL& UL, Bad Qual (Interference ) DL & UL, and High TA ·          Drop on LAC boundary. ·          SW congestion ·          Due to TCH Congestion. ·          Hardware issue, Timeslot Faulty, High VSWR, Alarm or Antenna Faulty, mismatch combining. ·          Interference or error on E1. ·          Drop due to radio failure. ·           SD drop due to MS faulty. ·          SD drop due to mismatch Rxlev_access_min value & RACH busy threshold ·          SD drop due to mismatch BA2 list, due to drop occur during HO.

·          The parameters SACCH Multi-Frames and Radio Link Timeout are set to too small values. ·          The parameter RXLEV_ACCESS_MIN is set to a too small value. ·          The parameter RACH Min.Access Level is set to a too small value. ·          The parameters Min DL Power on HO Candidate Cell and Min Access Level Offset are inappropriately set. ·          The length of timer T3103 (this timer is set to wait for a Handover Complete message) is set to a too small value. ·          The length of timer T3109 (this timer is set to wait for a Release Indication message) is set to a too small value. ·          The length of timer T3111 (this timer specifies the connection release delay) is set...