Changes between Version 8 and Version 9 of Tutorials/k0SDR/Tutorial26
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- Oct 3, 2019, 5:32:33 PM (5 years ago)
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Tutorials/k0SDR/Tutorial26
v8 v9 1 1 == LTE Traffic Trace Collection == 2 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 USRPsand data/logs recorded at eNodeB were extraced using standard linux tools. A high level system diagram is given below.2 This wiki page contains the tutorial to collect traffic traces for realtime application such as video, web, mail services etc. at RLC, MAC and PDCP layer of LTE protocol stack in ORBIT testbed using OpenAirInterface (OAI) emulation platform. Users were connected over the air using b210 USRP and data/logs recorded at eNodeB were extraced using standard linux tools. A high level system diagram is given below. 3 3 4 4 ||||||Figure 1: System Diagram - Trace Collection|| … … 6 6 7 7 === Description === 8 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 theinterfaces is given below. This tutorial will cover following sections:8 For this experiments we need UEs (User Equipment), eNB (eNodeB) having b210 USRP, two other nodes for EPC (Evolved Packet Core) and a server to test connectivity and bandwidth. 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 users can be added but we have tested with just 3 users in this experiment. A detailed system diagram with list of all the attached interfaces is given below. This tutorial will cover following sections: 9 9 * Setup OAI emulation framework 10 10 * Connecting UE to LTE network … … 13 13 * Application Design 14 14 * Trace collection and Evaluation 15 * OAI script15 * OAI run using scripts (github link) 16 16 17 ||||||Figure 2: GRID OAI System Design Implementa ion- Trace Collection||17 ||||||Figure 2: GRID OAI System Design Implementation for 3 users - Trace Collection|| 18 18 || [[Image(topology.jpg, 650px)]] || 19 19 … … 35 35 Server: {{{omf load -i baseline.ndz -t node3-2}}} 36 36 37 After loading the image turn on the nodes using command: {{{omf tell -a on -t node13-14,node13-7,node8-14,node8-7,node3-2,node2-2}}}37 After loading the image turn on the nodes using command: {{{omf tell -a on -t node13-14,node13-7,node8-14,node8-7,node3-2,node2-2}}} 38 38 39 2) Starting EPC : Run the following commands to enable eth0 interface and to start EPC components - HSS, MME and SPGW: 39 2) Starting EPC : \\ 40 Run the following commands to enable eth0 interface and to start EPC components - HSS, MME and SPGW: 40 41 {{{ 41 42 ssh root@node2-2 … … 54 55 }}} 55 56 56 4) Starting eN odeB57 4) Starting eNB: 57 58 {{{ 58 59 ssh root@node8-7 … … 80 81 }}} 81 82 82 The Tx and Rx gain ha ve to adjusted based on physical distance between UE and eNB. Same procedure is repeated if you want to add UE2 and UE3 but the IP address will be different. IP address assignment by MME depends on when the UE is attached to network. If UE1, UE2 and UE3 are attached sequentially then their IP address will be {{{172.16.0.2, 172.16.0.4 and 172.16.0.6}}} respectively.83 The Tx and Rx gain has to adjusted based on physical distance between UE and eNB. Same procedure is repeated if you want to add UE2 and UE3 but the IP address will be different. IP address assignment by MME depends on when the UE is attached to network. If UE1, UE2 and UE3 are attached sequentially then their IP address will be {{{172.16.0.2, 172.16.0.4 and 172.16.0.6}}} respectively. This IP assignment can be easily checked using {{{ifconfig}}} 83 84 84 85 === Connecting Multiple UEs === 85 More users can also be connected for a realistic LTE scenarnio. Apart from the nodes used above {{{node18-2, node18-19 and node3-19}}} has USRPb210s and can be used to emulate UEs. The same UE image can be used but we have to change IMSI and MSISDN for newly added UEs. The following procedure has to be followed to add multiple UE - 86 More users can also be connected for a realistic LTE scenario. Apart from the nodes used above {{{node18-2, node18-19 and node3-19}}} have USRPb210 and can be used to emulate UE. The same UE image can be used but we have to change IMSI and MSISDN for newly added UEs. The following procedure has to be followed to add multiple UE : 87 * Remove any existing UE with same IMSI from HSS database (remember IMSI). 86 88 * IMEI should be different for different users. Take the same IMEI from HSS database, add it to config of UE but while adding in database (DB) again, make it null (IMP). 87 * Remove any existing UE with same imsi from DB 88 * Add in DB using the command below with IMSI, MSISDN 89 * Add in database using the command below with IMSI, MSISDN 89 90 {{{ 90 91 ssh root@node2-2 (EPC) … … 102 103 }}} 103 104 104 === Running OAI logging Module ===105 === Enabling OAI logging Module === 105 106 To collect the trace we need to enable T tracer present in OAI before starting the application and eNB. The following command is used to obtain the trace at eNB: 106 In a different terminal-107 107 {{{ 108 108 cd /root/openairinterface5g/common/utils/T/tracer;./textlog -d ../T_messages.txt -ip 0.0.0.0 -on MAC -on RLC -on PDCP -on RRC -no-gui > /var/log/enbtracer.log 2> /var/log/enbtracer.log & 109 109 }}} 110 110 111 With the above command, traces will be collected at MAC, RLC , PDCP and RRC layer which will be dumped in enbtracer.log file present at /var/log directory. 112 113 === Application Design === 114 1) Test Application 115 * Ping and Perf: 116 117 2) Video Application 118 119 3) Web Traffic Application 120 121 4) Email Services 122 123 5) Skype (Pending)
