Artiza LTE eNB Test Solutions

Layer 2

Transport channels, Layer2 structure, Logical channels, and the procedures are introduced in this section.

Transport Channels
Downlink transport channel types are:
  • Broadcast Channel (BCH) characterized by:
    • fixed, pre-defined transport format
    • requirement to be broadcast in the entire coverage area of the cell.
  • Downlink Shared Channel (DL-SCH) characterized by:
    • support for HARQ
    • support for dynamic link adaptation by varying the modulation, coding and transmit power
    • possibility to be broadcast in the entire cell
    • possibility to use beamforming
    • support for both dynamic and semi-static resource allocation
    • support for UE discontinuous reception (DRX) to enable UE power saving.
  • Paging Channel (PCH) characterized by:
    • support for UE discontinuous reception (DRX) to enable UE power saving (DRX cycle is indicated by the network to the UE)
    • requirement to be broadcast in the entire coverage area of the cell
    • mapped to physical resources which can be used dynamically also for traffic/other control channels.
  • Multicast Channel (MCH) (from Release 9) characterized by:
    • requirement to be broadcast in the entire coverage area of the cell
    • support for MBSFN combining of MBMS transmission on multiple cells
    • support for semi-static resource allocation e.g., with a time frame of a long cyclic prefix.
Uplink transport channel types are:
  • Uplink Shared Channel (UL-SCH) characterized by:
    • possibility to use beamforming (likely no impact on specifications)
    • support for dynamic link adaptation by varying the transmit power and potentially modulation and coding
    • support for HARQ
    • support for both dynamic and semi-static resource allocation.
  • Random Access Channel(s) (RACH) characterized by:
    • limited control information
    • collision risk