LTE Traffic Trace Collection

This wiki page contains the tutorial to collect traffic traces for realtime application such as video, web, mail etc. at RLC, MAC and PDCP layer of LTE protocol stack in ORBIT testbed using OpenAirInterface (OAI).Users were connected over the air using b210 USRPs and data/logs recorded at eNodeB were extraced using standard linux tools. A high level system diagram is given below.

Figure 1: System Diagram - Trace Collection

Description

For this experiments we need UEs, eNB having b210s USRP, two other nodes for EPC and Server are also needed. We have used grid sandbox with node8-7 as eNB; node13-7, node13-14 and node8-14 as UEs; node2-2 as EPC; node3-2 as server. More UEs can be added but we have tested with just 3 users in this experiment. A detailed system diagram with list of all the interfaces is given below. This tutorial will cover following sections:

• Setup OAI emulation framework
• Connecting UE to LTE network
• Connecting Multiple UEs
• Running OAI logging Module
• Application Design
• Trace collection and Evaluation

Figure 2: GRID OAI System Design Implementaion - Trace Collection

Setup OAI emulation framework

1) Loading an image into ORBIT node

• Loading UE image:
  UE1: omf load -i ue1.ndz -t node13-14
  UE2: omf load -i ue2.ndz -t node13-7
  UE3: omf load -i ue3.ndz -t node8-14

• Loading eNB image:
  eNB: omf load -i enb.ndz -t node8-14

• Loading EPC image:
  EPC: omf load -i epc.ndz -t node2-2

• Loading Server image:
  Server: omf load -i baseline.ndz -t node3-2