Wednesday, 7 October 2015

LTE TRANSPORT

 

Operator Needed

 
 Clarification Needed

Transport Overhead
          S1 U-plane overhead estimation (as seen from air interface)
     Traffic profile: 50% small (~60B) / 25% medium (~600B) / 25% large (~1500B) packets
     RLC/PDCP      -6%
     UDP/GTP               +3.6%
     IP/IPsec                  +15%
     Ethernet                +6.3%
                                                                                         +20%        


 



TCP Throughput vs Round Trip Time (RTT)

         The Transmission Control Protocol (TCP) is designed to provide reliable transport for packet data.
         Today TCP is used for 80-90% of all packet traffic in the internet.
         TCP is typically used in applications and their respective protocols where reliability is important, e.g. web browsing (HTTP), Email (SMTP) and file transfer (FTP).


Transport Service Attributes - SLA Parameters
Transport service attributes are primarily driven by user service requirements


         Packet Delay (PD)                           10 ms
   U-plane: TCP based protocols are sensitive against end-to-end delay, i.e. user experience will be affected
   C-plane applications are designed so that the system will also work on transport networks built upon recommendations given earlier for WCDMA Iub (20ms).

         Packet Delay Variation (PDV)       ±5.0 ms
   Required for Timing-over-Packet (ToP) based on IEEE1588-2008)
   Can be relaxed if ToP is not used

         Packet Loss Ratio (PLR)                10e-4   (0.01%)



IP Based Protocols for User, Control, Management and Synchronization Plane