End to End Delay Performance Evaluation for VoIP in the LTE Network

Transcription

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

2 Introduction Background Information Implementation Details Discussion of Results Conclusion 2

3 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

4 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 Ø Ø Ø Motivation Evaluate the performance and stability of the LTE at an early stage for promoting smooth and cost efficient deployment Discuss issues related to the traffic behavior of VoIP alone and also with the other traffics within the LTE system Ensure fast and secured voice network for a huge number of users involved in wireless networking 4

5 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

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

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

8 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

9 Ø Ø Ø 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 GP- Guard Period UpPTS-Uplink Pilot Time Slot 9

10 Deliver voice communication over computer networks. Internet s packetswitching capabilities Save lots of money from traditional telephone calls. 10

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

12 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

13 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

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

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

16 Simulation Case Definition Case Bandwidth (MHz) VoIP Traffic Load (%) Workstation Distance (Km) Speed (m/s)

17 E2E Delay Packet Loss 17

18 Simulation Case Definition Case Bandwidth (MHz) VoIP Traffic Load (%) Workstation Distance (Km) Speed (m/s)

19 E2E Delay Packet Loss 19

20 Simulation Case Definition Case Bandwidth (MHz) VoIP Traffic Load (%) FTP File Size Speed (m/s) Gb Gb Gb Gb 20 20

21 E2E Delay Packet Loss 21

22 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

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

24 3GPP, Third Generation Partnership Project (3GPP). [Online]. Available: 3GPP, Release 8 V0.0.3, Overview of 3GPP Release 8: Summery of all Release 8 Fea- tures, November OPNET. Opnet modeler [Online]. Available: modeler.html Wikipedia. [online]. Available: Technical White Paper: Long Term Evolution (LTE): A Technical Overview, Motorola, Inc