End to End Delay Performance Evaluation for VoIP in the LTE Network - PowerPoint PPT Presentation

ENSC 427 COMMUNICATION NETWORKS SPRING 2013 Final Project Presentation End to End Delay Performance Evaluation for VoIP in the LTE Network Dai, Hongxin danield @ sfu.ca Ishita, Farah fishita @ sfu.ca Lo, Hao Hua hhl12 @ sfu.ca Group # 4

¨ Introduction ¨ Background Information ¨ Implementation Details ¨ Discussion of Results ¨ Conclusion 2

q Project Idea The main idea of this project is to study performance of VoIP over § LTE Study the individuality of voice and FTP server over LTE § networks. Understand how the configuration can be done in the LTE § environment and set networks attributes into the OPNET Modeler 16.0 Simulate different network scenarios with different network loads § and analyze the simulated results Reach conclusions and interpret the results § 3

What is LTE? ¨ Long Term Evolution (LTE) protocol is a 4G wireless broadband ¨ Technology which aims to provide an efficient networking. LTE grew out of Universal Mobile Telecommunication System ¨ (UMTS), commonly know as 3G Motivation ¨ Evaluate the performance and stability of the LTE at an early Ø stage for promoting smooth and cost efficient deployment Discuss issues related to the traffic behavior of VoIP alone and Ø also with the other traffics within the LTE system Ensure fast and secured voice network for a huge number of Ø users involved in wireless networking 4

The eNB supports air interface, ¨ – provides radio resource management function Serving Gateway (SGW) ¨ – provides Mobility and is – responsible for Routing and forwarding Packet Data Network Gateway (PDN ¨ GW) – provides connectivity to Internet as well as it provides QoS and mobility between 3G and non-3G networks Mobility Management Entity (MME) ¨ – manages mobility and provides authentication 5

¨ LTE Performance Requirements Metric ¡ Requirement ¡ Peak ¡Data ¡Rate ¡ DL ¡: ¡100Mbps ¡ UL: ¡50Mbps ¡ (for ¡20MHz ¡Spectrum) ¡ Mobility ¡support ¡ Up ¡to ¡500 ¡Kmph ¡but ¡opDmized ¡for ¡low ¡speeds ¡ from ¡0 ¡to ¡15Km/h ¡ Control ¡plane ¡latency(TransiDon ¡Dme ¡to ¡acDve ¡ <100 ¡ms ¡(for ¡idle ¡to ¡acDve) ¡ state) ¡ User ¡plane ¡latency ¡ ¡ <5ms ¡ Control ¡plane ¡capacity ¡ ¡>200 ¡users ¡per ¡cell ¡( ¡for ¡ ¡5MHz ¡spectrum) ¡ Coverage ¡(Cell ¡sizes) ¡ 5 ¡-­‑100 ¡Km ¡with ¡slight ¡degradaDon ¡aPer ¡30Km ¡ Spectrum ¡flexibility ¡ ¡1,4,3,5,10, ¡15, ¡and ¡20 ¡MHz ¡ 6

¨ Generic Frame Structure Designed for radio –access- network of LTE § Applied in Frequency Division Duplex (FDD) and Time § Division Duplex (TDD) Two Types of generic frame structures § Ø Type 1 LTE Frame Structure Ø Type 2 LTE Frame Structure 7

¨ Type 1 LTE Frame Structure Supports both half and full ¨ duplex FDD modes Radio Frame has time period of ¨ 10ms , where each slot has time period of 0.5ms Each radio frame contains 20 ¨ slots Two carrier frequency domains ¨ in FDD mode are for upper and down link directions 8

¨ Type 2 LTE Frame Structure Applied to TDD ¨ Consists of two identical half frames ¨ Each half frame has a time period of ¨ 5 ms Each half frame is divided in to ¨ 5 sub frames Each sub frame consists of § DwPTS – Downlink Pilot Time Slot Ø GP- Guard Period Ø UpPTS-Uplink Pilot Time Slot Ø 9

¨ Deliver voice communication over computer networks. ¨ Internet’s packet- switching capabilities ¨ Save lots of money from traditional telephone calls. 10

¨ Application Config ¨ Application Profile ¨ LTE parameter ¨ Mobility parameter ¨ eNodeB ¨ EPC (Evolved Packet Core) ¨ Source/destination 11

¨ Time required for a packet to travel from source (sender) to destination (receiver) ¨ Theoretically, the packet end to end delay should not go over 150ms. ¨ 3 types of delay: - sender delay - network delay - receiver delay 12

¨ Packet loss occurs when packets in the network fail to reach the destination ¨ Why does packet loss occur? ¨ Does packet loss always indicate a problem? 13

VoIP Parameter Value LTE Parameter Value QoS class identifier (Voice) 1 (GBR) Encoder Scheme G.711 QoS class Identifier (FTP) 6 (Non-GBR) Interactive Voice Voice (6) UL Guaranteed Bit Rate 1 Mbps Offset Time 60s DL Guaranteed Bit Rate 1 Mbps Start Time 40s UL Maximum Bit Rate 1 Mbps Repeatability Every 10s DL Maximum Bit Rate 1 Mbps Duration End of simulation UL Bandwidth 20 MHz DL Bandwidth 20 MHz FTP Parameter Value Command Mix 50% Inter Request Time 60s File Size 1 Gb Type of Service Best Effort 14

¨ Baseline VoIP & ¨ VoIP Congested with Congested VoIP FTP Network 15

¨ Simulation Case Definition Bandwidth VoIP Traffic Workstation Case Distance (Km) Speed (m/s) (MHz) Load (%) 1 20 50 0.5 0 2 20 50 0.5 10 3 20 50 0.5 20 4 20 50 0.5 50 16

¨ E2E Delay ¨ Packet Loss 17

¨ Simulation Case Definition Bandwidth VoIP Traffic Workstation Case Distance (Km) Speed (m/s) (MHz) Load (%) 1 20 95 0.5 0 2 20 95 0.5 10 3 20 95 0.5 20 4 20 95 0.5 50 18

¨ E2E Delay ¨ Packet Loss 19

¨ Simulation Case Definition Bandwidth VoIP Traffic Case FTP File Size Speed (m/s) (MHz) Load (%) 1 20 80 1 Gb 0 2 20 80 1 Gb 20 3 20 80 2 Gb 0 4 20 80 2 Gb 20 20

¨ E2E Delay ¨ Packet Loss 21

¨ End to End delay and Packet Loss are proportion to the moving speed of the mobile object ¨ While VoIP and FTP are running simultaneously, the End to End delay and Packet Loss increase. 22

¨ Professor: LjilJana Trajkovic ¨ Teaching Assistant : Soroush Haeri, Majid Arainezhad 23

3GPP, “Third Generation Partnership Project (3GPP).” [Online]. ¨ Available: http://www.3gpp.org/ 3GPP, Release 8 V0.0.3, “Overview of 3GPP Release 8: Summery of ¨ all Release 8 Fea- tures,” November 2008. OPNET. Opnet modeler 16.0. [Online]. ¨ Available: http://www.opnet.com/solutions/network_rd/ modeler.html Wikipedia. [online]. Available: http://www.wikipedia.com ¨ “Technical White Paper: Long Term Evolution (LTE): A Technical ¨ Overview”, Motorola, Inc. www.motorola.com, 2007 24