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¨ Introduction ¨ Background Information ¨ Implementation Details ¨ Discussion of Results ¨ Conclusion
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End to End Delay Performance Evaluation for VoIP in the LTE Network - - PowerPoint PPT Presentation
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
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q Project Idea
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The main idea of this project is to study performance of VoIP over
LTE
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Study the individuality of voice and FTP server over LTE networks.
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Understand how the configuration can be done in the LTE environment and set networks attributes into the OPNET Modeler 16.0
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Simulate different network scenarios with different network loads and analyze the simulated results
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Reach conclusions and interpret the results
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What is LTE?
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Long Term Evolution (LTE) protocol is a 4G wireless broadband Technology which aims to provide an efficient networking.
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LTE grew out of Universal Mobile Telecommunication System (UMTS), commonly know as 3G
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Motivation
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Evaluate the performance and stability of the LTE at an early stage for promoting smooth and cost efficient deployment
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Discuss issues related to the traffic behavior of VoIP alone and also with the other traffics within the LTE system
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Ensure fast and secured voice network for a huge number of users involved in wireless networking
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The eNB supports air interface, provides radio resource management function
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Serving Gateway (SGW) provides Mobility and is responsible for Routing and forwarding
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Packet Data Network Gateway (PDN GW) provides connectivity to Internet as well as it provides QoS and mobility between 3G and non-3G networks
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Mobility Management Entity (MME) manages mobility and provides authentication
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¨ 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 ¡ state) ¡ <100 ¡ms ¡(for ¡idle ¡to ¡acDve) ¡ 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 ¡
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¨ Generic Frame Structure
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Designed for radio –access- network of LTE
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Applied in Frequency Division Duplex (FDD) and Time Division Duplex (TDD)
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Two Types of generic frame structures
Ø Type 1 LTE Frame Structure Ø Type 2 LTE Frame Structure
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¨ Type 1 LTE Frame
Structure
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Supports both half and full duplex FDD modes
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Radio Frame has time period of 10ms , where each slot has time period of 0.5ms
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Each radio frame contains 20 slots
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Two carrier frequency domains in FDD mode are for upper and down link directions
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¨ Type 2 LTE Frame
Structure
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Applied to TDD
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Consists of two identical half frames
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Each half frame has a time period of 5 ms
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Each half frame is divided in to 5 sub frames
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Each sub frame consists of
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DwPTS – Downlink Pilot Time Slot
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GP- Guard Period
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UpPTS-Uplink Pilot Time Slot
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¨ Deliver voice
communication over computer networks.
¨ Internet’s packet-
switching capabilities
¨ Save lots of money
from traditional telephone calls.
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¨ Application Config ¨ Application Profile ¨ LTE parameter ¨ Mobility parameter ¨ eNodeB ¨ EPC (Evolved Packet
Core)
¨ Source/destination
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¨ Time required for a packet to travel from source
(sender) to destination (receiver)
¨ Theoretically, the packet end to end delay should not go
- ver 150ms.
¨ 3 types of delay:
- sender delay
- network delay
- receiver delay
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¨ 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?
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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 Value QoS class identifier (Voice) 1 (GBR) QoS class Identifier (FTP) 6 (Non-GBR) UL Guaranteed Bit Rate 1 Mbps DL Guaranteed Bit Rate 1 Mbps UL Maximum Bit Rate 1 Mbps DL Maximum Bit Rate 1 Mbps UL Bandwidth 20 MHz DL Bandwidth 20 MHz
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¨ Baseline VoIP &
Congested VoIP
¨ VoIP Congested with
FTP Network
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¨ Simulation Case Definition
Case Bandwidth (MHz) VoIP Traffic Load (%) Workstation Distance (Km) Speed (m/s) 1 20 50 0.5 2 20 50 0.5 10 3 20 50 0.5 20 4 20 50 0.5 50
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¨ E2E Delay ¨ Packet Loss
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¨ Simulation Case Definition
Case Bandwidth (MHz) VoIP Traffic Load (%) Workstation Distance (Km) Speed (m/s) 1 20 95 0.5 2 20 95 0.5 10 3 20 95 0.5 20 4 20 95 0.5 50
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¨ E2E Delay ¨ Packet Loss
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¨ Simulation Case Definition
Case Bandwidth (MHz) VoIP Traffic Load (%) FTP File Size Speed (m/s) 1 20 80 1 Gb 2 20 80 1 Gb 20 3 20 80 2 Gb 4 20 80 2 Gb 20
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¨ E2E Delay ¨ Packet Loss
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¨ 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.
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¨ Professor: LjilJana Trajkovic ¨ Teaching Assistant : Soroush Haeri,
Majid Arainezhad
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3GPP, “Third Generation Partnership Project (3GPP).” [Online]. Available: http://www.3gpp.org/
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3GPP, Release 8 V0.0.3, “Overview of 3GPP Release 8: Summery of all Release 8 Fea- tures,” November 2008.
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- OPNET. Opnet modeler 16.0. [Online].
Available: http://www.opnet.com/solutions/network_rd/ modeler.html
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- Wikipedia. [online]. Available: http://www.wikipedia.com
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“Technical White Paper: Long Term Evolution (LTE): A Technical Overview”, Motorola, Inc. www.motorola.com, 2007
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