lte knw

8/18/2019 LTE KNW

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Narrator: NextGen Technologies is a company which is developing LTE core networkelements to gain its share of prot in the LTE business The di!erent groups withinNextGen like the development team" test team" and sales team are coming up to

speed on LTE Two experts on LTE" #atti and Eric" are giving a presentation to therest of the team on LTE $achel" a test team manager" is trying to learn all she canabout LTE %n this topic Eric is giving a presentation to the team and #atti and $achel areattending the presentation

#atti: The evolution process of wireless networks is an ongoing phenomenon Thereis always a need for higher data rates" capacity" etc Let&s try to highlight thelimiting factors of 'GEric: (urrent 'G networks o!er theoretical data rates of )* +bps in the downlinkand ,- +bps in the uplink using a , +./ wide channel .owever" these data ratesare not practical data rates for several reasons 0ne of the key reasons is that the ,+./ channel is also used to o!er voice services" so the resources are divided

between voice and data users 1e expect data rates of around ) to 2 +bps in thecommercial deployment

8/18/2019 LTE KNW


#atti: Enhancements like .igh 5peed 7ownlink #acket 8ccess 9.57#8 and .igh 5peed ;plink#acket 8ccess 9.5;#8 make 'G## access technology competitive To ensure the competitivenessof 'G## systems for the next ten years and beyond" a long term evolution of 'G## accesstechnology is speciedEric: <ut % heard non4'G## networks can also use LTE as their *th generation network choice#atti: =ou are absolutely right" Eric> Later we will discuss the e!ort made to interwork LTE with'G##2 technologies like )xE?470 To meet the needs of the rapidly growing %# data tra@c over the

air" the 'G## packet switched technology is looking at further enhancements to its current accessand core$achel: %s seamless mobility considered in LTEA#atti: =es it is> %t is one of the motivations 5eamless mobility has been the holy grail of wirelessnetworks for a long time % will explain seamless mobility in a bit Lastly" reduction in cost can be achieved by avoiding a complicated architecture and unnecessary

interfaces $eduction in the cost can be achieved by simplifying the wireless network" utili/ingunied protocols of %#" and reducing the number of network nodes

8/18/2019 LTE KNW


8/18/2019 LTE KNW


Eric: % would think *G networks provide an end4to4end solution withevolution made to their air interface" the radio network and the corenetwork#atti: 8bsolutely>> The common features across the emerging nextgeneration technologies are:

C ;se of 0rthogonal Dreuency 7ivision +ultiplexing 90D7+ andadvanced multiple antenna techniues over the air interfaceC 7istributed 9as opposed to centrali/ed architectureC %#4based radio and core network$achel: % Fust read last week that the 0rthogonal Dreuency 7ivision+ultiple 8ccess 90D7+8 and multiple antenna techniues signicantly

increase the spectral e@ciency#atti: %n *G alternatives there is a shift from the (7+84based air interfaceof 'G networks to 0D7+4based air interface 8n e@cient air interfaceallows many users to experience data rates in excess of ) +bps The peaksupportable data rates are more than )33 +bps 9as high as 23 +bps in a23 +./ spectrum

Eric: 7istributable radio network architecture allows reduced latency sincemost dynamic decisions are made HlocallyH 8n %#4based radio networkresults in an easy4to4scale network and provides scalability and reductionin the cost Durthermore" it allows introduction of new services easily viathe %# +ultimedia 5ubsystem 9%+5 5ince %+5 makes it easy for the serviceoperator to o!er a variety of services" we will use it in our examples

throughout the course .owever" please note that the use of %+5 is notmandator and that an o erator could o!er numerous services even

8/18/2019 LTE KNW


$achel: 1hat are the killer applications of *GAEric: The most important point is that *G o!ers improved bandwidths and data throughput withless delay This will increase the overall end user experience in any services like video chat"mobile T?" +ultimedia +essaging 5ervice 9++5 and voice services on the packet network$achel: (an you elaborate a little bit on these servicesAEric: ?ideo chat is a set of interactive telecommunication technologies which allow two or morelocations to interact via two4way video and audio transmissions simultaneously +obile T?

involves bringing T? services to the mobile phones %t combines the services of a mobile phonewith television content %n addition to mobility" mobile T? delivers a variety of servicesincluding video4on4demand" traditional and live T? programs ++5 is the standard for a telephony messaging system that allows the sending of messagesthat includes multimedia obFects 8n %#4based core network allows the introduction of newservices easily via %+5 1ith %+5 voice services are supported over the packet core network

8/18/2019 LTE KNW


$achel: #atti" can you compare the data rates of di!erentwireless technologiesA#atti: Let me show you a chart % have on the data rates%t shows the maximum data rates and the advertiseddata rates of di!erent wireless technologies 8s youknow" multiple 'G wireless technologies have beendened and deployed around the world today These 'Gtechnologies provide an evolution path from the existing

2G technology4based networks ;niversal +obile Telecommunications 5ystem 9;+T5provides an evolution path to theG5+6G#$56EG#$56E7GE systems .57#8 9.igh 5peed7ownlink #acket 8ccess and .5;#8 9.igh 5peed ;plink#acket 8ccess are ;+T5 enhancements that enablemore optimal use of bandwidth and much higher datarates Durther enhancement of .5#8 with +ultiple %nput

and +ultiple 0utput techniues and a higher ordermodulation scheme resulted in .5#8I (7+82333 provides an evolution path to %54J, systems(7+82333 )x and )xE?470 are two di!erent options for'G technologies Long Term Evolution or LTE has emerged as thetechnology path for both )xE?470 and ;+T56.5#8networks +obile 1i+8K is the competing *G technologywith LTE

Exit (ourse

8/18/2019 LTE KNW


Eric: #atti" can you give us a uick overview on LTEA#atti: LTE 9Long Term Evolution is an end to end enhancement to the existing ;+T5 architecture LTE is implementedusing an evolved packet system 9E#5 architecture E#5 represents a migration from the traditional hierarchicalsystem architecture to a at architecture that minimi/es the number of hops and distributes the processing loadacross the network

$achel: 1hat does the evolved packet system or E#5 consist ofA#atti: The evolved packet system 9E#5 is made up of the evolved packet core 9E#( and evolved ;T$8N 9e;T$8N

The LTE e;T$8N has an evolved Node < 9eN< and a new air interface based on 0rthogonal Dreuency 7ivision+ultiple 8ccess 90D7+8 in the downlink and 5ingle (arrier Dreuency 7ivision +ultiple 8ccess 95(4D7+8 in theuplink

The LTE air interface is a new packet4only wideband radio with at architecture The E#( is a packet switched datasolution which supports inter4working across di!erent 'G## and non 'G## access technologies The number of nodesand the interfaces are reduced in the LTE architecture to cut down on the latency" the cost and the complexity

WHAT IS LTE

8/18/2019 LTE KNW


$achel: .ow are voice services supported in LTEA 7oes the LTE architecture include %+5 supportA#atti: =es" you are right 0ne of the key changes in the wireless networks is an evolution towards8ll4%# based core networks %n these networks" both voice and data services are provided by one consolidated network

0perators will be able to provide voice and data services with a single unied core network 8s aresult" separation between the circuit switched and packet switched networks will disappear 8lso"the voice services will be supported by ?oice 0ver %# 9?o%# technologies like %+5 The circuitswitched network functions will be provided by ?o%# elements such as 5%# servers and gatewaysconnecting 8ll4%# networks or %+5 to the #5TN The mobility management functions will beintegrated into #acket 7ata Gateways 9#7Gs such as #75Ns and 5G5Ns

How are voice services supported in LTE? Does the LTE architecture in

8/18/2019 LTE KNW


$achel: (an you please uickly introduce %+5 to meA#atti: %+5 is a services network 5ervices support is made independent of the underlying access technologies <earersupport reuired to support services is dependent on the underlying access technology" but not the servicessupport

8 service introduced in the %+5 network can be accessed using any technology The %+5 architecture is based on aset of building blocks that can be grouped into the following categories: 5ession +anagement and $outing"7atabases" %nterworking" and 5ervices (all 5ession (ontrol Dunction 9(5(D is the key element responsible for session management and routing ;nder 7atabases" the key element is the .ome 5ubscriber 5erver 9.55 The .55 is an evolved .ome Location$egister 9.L$ from a legacy mobile network

$achel: <ut .55 is not a new node thoughA#atti: That&s right> The .55 is upgraded to store %+5 related services information for a subscriber

%+5

8/18/2019 LTE KNW


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