Low Latancy in HSPA
Transcript of Low Latancy in HSPA
> The Importance of Low Latency in HSPA
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Introduction
PacketCore
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Why learn about HSPA latency?
› HSPA leading Mobile
Broadband technology
› Latency largely influences
consumer’s service
perception
› Ericsson has industry-
leading latency
performance
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Objective and Scope
› Show the importance of low latency in HSPA networks and Ericsson’s leading position
Objectives
Scope
› Explain what latency is
› Describe advantages of low latency
› Give results from Ericsson networks
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AGENDA
› What is latency?
› Advantages of low latency
› Latency in HSPA networks
› How to measure latency
› Latency in Ericsson
networks
› Summary
PacketCore
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What is Latency?
PacketCore
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What is latency?
› Round-trip latency:
–One-way delay from source to
destination + one-way delay from the
destination back to the source
› Good indicator of network quality
› Measured with “ping” instruction
PacketCore
Source: Wikipedia
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Advantages of low latency
PacketCore
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Advantage of low latency
› File download
› Web browsing
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Client Server
Mail and attachment
Total time to download mail
Handshake signaling part
Download part
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File Download (FTP)
› Latency drives increase of
download speed
› Bit rate is gradually
increased to top speed
› Lower latency increases the
acceleration of bit rate
SYN
SYN,ACK
Data, ACK
ACK
Data
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Web page download
Client Server
”File download part”
”Signalingpart”
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Latency in HSPA Networks
PacketCore
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Latency in HSPA Networks
RBSRNCSGSNGGSN
UuIubIu_PS
Iu_PS
Direct Tunnel
Internet
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Latency in HSPA Networks
Latency dependent on UL type:› HSPA UL (2 ms TTI)– Typical 5.8 Mbps UL
› HSPA UL (10 ms TTI)– Typical 1.4 Mbps UL
› R99 UL– Typical 384 kbps
UserdeviceCore Network/
Service Network
Radio Access Network
RadioInterface
Typical latency distribution
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How to Measure Latency?
PacketCore
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PING COMMAND
› Examples:ping www.ericsson.seping 213.132.96.193 –t (press ctrl-C to stop)ping 213.132.96.193 –n 10 (do 10 ping measurements)
Detailed presentation: link
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HSPA state machine - Goal: Find Latency of dedicated channel
URA-PCHURA-PCH
HSPA(Dedicated)
HSPA(Dedicated)
FACH(common)
FACH(common)
IdleIdle
Idle to DCHdelay
FACH latencyis much longer
Goal:HSPA latency
› Different operators have different settings› Speedtest sites often measure latency incorrectly
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Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Latency in Ericsson networks
PacketCore
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Good latency measurementOn dedicated channel
› “Short ping” result performed on commercial network
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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HSPA latency
Operator Region UL type* Latency1 Europe 2 ms TTI 22 ms
2 Europe 2 ms TTI 28 ms
2 Europe 2 ms TTI 29 ms
3 Europe 2 ms TTI 31 ms
4 Europe 2 ms TTI 56 ms
5 Asia 10 ms TTI 40 ms
6 Asia 10 ms TTI 42 ms
2 Europe 10 ms TTI 49 ms
7 Europe 10 ms TTI 52 ms
8 Europe 10 ms TTI 53 ms
9 Europe 10 ms TTI 53 ms
10 Europe 10 ms TTI 65 ms
11 Americas 10 ms TTI 65 ms
12 Europe R99 61 ms
13 Asia R99 63 ms
5 Asia R99 70 ms
6 Asia R99 70 ms
› Measurement results from 13 Ericsson networks
* UL type: Combination of specified network and device capability (not verified during measurement).
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Competitor benchmark
Latency(12 Byte payload)
<half the latency
Ericsson 41ms
Competitor 97ms
› Latency measurements performed in Japan
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Competitor benchmark
› User experience in commercial networks in Japan
Ericsson HSPA
Vendor B HSPA
Latency (ping) [ms]
12 Byte 41 97
Web page download time [s]
small page 1.3 2.3
large page 12 25
File down/upload time [s]
1MB 2.6 / 3.2 4.4 / 5.9
10MB 21 / 28 37 / 54
HSPA: 7.2/5.8 Mbps device
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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> QUIZ
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Quiz
› Which three of the following processes are included in the
result of a good latency measurement in HSPA?– The time it takes for a connection to go to dedicated channel mode
– The time it takes for a message to travel from the end-user device
to a server on the internet
– The time it takes for the network to move back to idle mode
– The time it takes in a device to process an incoming ping response
– The time it takes for a server to process an incoming ping message
and send a response
– The time it takes to send a message via the FACH channel
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Quiz
› Which three of the following processes are included in the
result of a good latency measurement in HSPA?– The time it takes for a connection to go to dedicated channel mode
– The time it takes for a message to travel from the end-user device
to a server on the internet
– The time it takes for the network to move back to idle mode
– The time it takes in a device to process an incoming ping response
– The time it takes for a server to process an incoming ping message
and send a ping response message
– The time it takes to send a message via the FACH channel
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Summary
PacketCore
Slide title minimum 32 pt
(32 pt makes 2 rows)
Text and bullet level 1minimum 24 pt
Bullets level 2-5minimum 20 pt
›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl
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Summary
› Latency: Time for message to travel from
end-user device to server on internet and
back
› Latency largely influences end-user
perceived performance and experience
› Low latency is important for basically all
applications
› Ericsson has industry-leading latency
PacketCore