LTE uses EPS bearers to carry user data traffic. There are two types of EPS bearers - default bearers and dedicated bearers. Default bearers are created for each PDN connection and provide basic "best effort" internet access. Dedicated bearers provide additional tunnels for specific traffic like VoLTE and can have guaranteed bitrates. Dedicated bearers are linked to a default bearer and inherit properties like the PDN address from the default bearer. GTP is the protocol used to encapsulate and carry bearer traffic through the LTE core network.
VoLTE Flows and legacy CS network. Basic call routing to and from CS network using BGCF, MGCF, MGW. ENUM role in routing. IMS Cetralized Services (IMC) and SRVCC scenarios.
It is a handbook of UMTS/LTE/EPC CSFB call flows.
This document is originally edited by Justin MA and it is free to share to everyone who are interested.
All reference/resource are from internet. If there is any copy-right issue, please kindly inform Justin by majachang@gmail.com.
Thanks for your reading!
LTE network: How it all comes together architecture technical posterDavid Swift
Mobile network operators that want to deploy LTE now want to do so on their own terms. They want to roll out ultrafast mobile broadband safe in the knowledge that one vendor’s solution will work efficiently with another, while delivering the high level of service that subscribers expect. A standards-based network will ensure the goal is met and help drive down cost for operators, but understanding how to pull it all together can be a challenge. So how does it all come together?
VoLTE Basic callflows in IMS network v2 - includes Registration, Basic VoLTE Call, SDP, Interconnect, Roaming, highlights important SIP headers for session routing and user identities.
VoLTE Flows and legacy CS network. Basic call routing to and from CS network using BGCF, MGCF, MGW. ENUM role in routing. IMS Cetralized Services (IMC) and SRVCC scenarios.
It is a handbook of UMTS/LTE/EPC CSFB call flows.
This document is originally edited by Justin MA and it is free to share to everyone who are interested.
All reference/resource are from internet. If there is any copy-right issue, please kindly inform Justin by majachang@gmail.com.
Thanks for your reading!
LTE network: How it all comes together architecture technical posterDavid Swift
Mobile network operators that want to deploy LTE now want to do so on their own terms. They want to roll out ultrafast mobile broadband safe in the knowledge that one vendor’s solution will work efficiently with another, while delivering the high level of service that subscribers expect. A standards-based network will ensure the goal is met and help drive down cost for operators, but understanding how to pull it all together can be a challenge. So how does it all come together?
VoLTE Basic callflows in IMS network v2 - includes Registration, Basic VoLTE Call, SDP, Interconnect, Roaming, highlights important SIP headers for session routing and user identities.
Determine the required delivery characteristics of a packet stream and how a Traffic Management (TM) module can offload compute-intensive tasks. Hear more about the latest innovations in both DPI & TM solutions.
Simplified Call Flow Signaling: Registration - The Attach Procedure3G4G
This presentation/video provides an example of the registration procedure. The device or UE needs to let the core network(s) know that it is switched on and active. This procedure is known as registration. The UE can register individually to the CS and PS core networks. Most modern networks allow combined registration (or combined attach) whereby the UE registers only to the PS network and the PS network informs the CS network that the UE is active.
Introduction of PS Core Network Elements and little bit of EPC/LTE Network. This is introductory slides pack for a 10 class/slides set for detail introduction of 2G/3G and LTE PS Core Network.
4G-LTE Paging is made simple and easy. How is paging handled in NAS, RRC and Physical layer. With DRX cycle, how will UE NOT miss any paging and synchronised? How to implement paging in RRC?
Circuit Switched Fallback (CSFB) is the most commonly used method to support voice services over Long Term Evolution (LTE) networks today, as the deployment of IP Multimedia Subsystem (IMS) is still in its infancy.
A quick look at 5G System architecture in Reference point representation and in Service Based representation and also look at the different Network Functions (NFs) within the 5G System.
Determine the required delivery characteristics of a packet stream and how a Traffic Management (TM) module can offload compute-intensive tasks. Hear more about the latest innovations in both DPI & TM solutions.
Simplified Call Flow Signaling: Registration - The Attach Procedure3G4G
This presentation/video provides an example of the registration procedure. The device or UE needs to let the core network(s) know that it is switched on and active. This procedure is known as registration. The UE can register individually to the CS and PS core networks. Most modern networks allow combined registration (or combined attach) whereby the UE registers only to the PS network and the PS network informs the CS network that the UE is active.
Introduction of PS Core Network Elements and little bit of EPC/LTE Network. This is introductory slides pack for a 10 class/slides set for detail introduction of 2G/3G and LTE PS Core Network.
4G-LTE Paging is made simple and easy. How is paging handled in NAS, RRC and Physical layer. With DRX cycle, how will UE NOT miss any paging and synchronised? How to implement paging in RRC?
Circuit Switched Fallback (CSFB) is the most commonly used method to support voice services over Long Term Evolution (LTE) networks today, as the deployment of IP Multimedia Subsystem (IMS) is still in its infancy.
A quick look at 5G System architecture in Reference point representation and in Service Based representation and also look at the different Network Functions (NFs) within the 5G System.
Ghhh hi nahi hai to me bhi hai to me bhi hai to me bhi hai to me bhi hai to me bhi hai to me bhi thik n i a good idea to me in my name is Sam ko bhi nahi to kya kar Raha ho kya baat kya kar Raha h or not sapre for the roots the sum temp 10 j n a b b e r and c j i 1 j i 1 j t ptr i rammmk the value of the value of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of r i 1 void the value of the value one by 2 result of the day 7yu7u9 the value of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of the day of divisors the sum sum rev rem 10 j i n a i 1 void addc1 a good time in. Black girl of divisors are not sapre of r i j n a b and equal in dignity and c j i 1 void the check in my name is the day of divisors the day of r c 2 a b c d e f g h I j k l m a good day of the year ree Fire is the ultimate survival shooter game available on mobile. Each 10-minute game places you on a remote island where you are pit against 49 other players, all seeking survival. Players freely choose their starting point with their parachute, and aim to stay in the safe zone for as long as possible.
https://m.imdb.com › title › plotsum...
Plot Summary - Free Fire (Videoree Fire is the ultimate survival shooter game available on mobile. Each 10-minute game places you on a remote island where you are pit against 49 other players, all seeking survival. Players freely choose their starting point with their parachute, and aim to stay in the safe zone for as long as possible.
https://m.imdb.com › title › plotsum...
Plot Summary - Free Fire (Videoree Fire is the ultimate survival shooter game available on mobile. Each 10-minute game places you on a remote island where you are pit against 49 other players, all seeking survival. Players freely choose their starting point with their parachute, and aim to stay in the safe zone for as long as possible.
https://m.imdb.com › title › plotsum...
Plot Summary - Free Fire (Videoree Fire is the ultimate survival shooter game available on mobile. Each 10-minute game places you on a remote island where you are pit against 49 other players, all seeking survival. Players freely choose their starting point with their parachute, and aim to stay in the safe zone for as long as possible.
https://m.imdb.com › title › plotsum...
Plot Summary - Free Fire (Videoree Fire is the ultimate survival shooter game available on mobile. Each 10-minute game places you on a remote island where you are pit against 49 other players, all seeking survival. Players freely choose their starting point with their parachute, and aim to stay in the safe zone for as long as possible.
https://m.imdb.com › title › plotsum...
Plot Summary - Free Fire (Videoree Fire is the ultimate survival shooter game available on mobile. Each 10-minute game places you o
Two MulteFire architecture solutions
- In PLMN access mode, the MulteFire RAN is connected to the 3GPP EPC
• MulteFire is an additional LTE “sub-type”
• Solution can be used by 3GPP PLMNs to extend their capacity or coverage
- In NHN access mode, the MulteFire RAN is connected to a Neutral Host Network
• Neutral Host Network is a self-contained “standalone” deployment providing IP services
• IP services can be provided to UEs associated with different Participating Service Providers
• A 3GPP PLMN can also be a Participating Service Provider
• Services of 3GPP PLMNs can be accessed using 3GPP defined Non-3GPP IW models
- These architecture solutions can address different types of deployments
This presentation explains the infamous standard for wireless broadband communication, called LTE.
CONTENTS
What is it? (Laymen Explanation)
Types (LTE-TDD, LTE-FDD) with technical differences
Features
Made of?
Voice Calls possible?
- VolTE
- CSFB
- SVLTE
Can We Call it 4G?
Summary
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
#vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore#blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #blackmagicforlove #blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #Amilbabainuk #amilbabainspain #amilbabaindubai #Amilbabainnorway #amilbabainkrachi #amilbabainlahore #amilbabaingujranwalan #amilbabainislamabad
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
2. EPS
• EPS stands for Evolved packet system.
• whole LTE system is developed to provide all types services through
packet switching.
• To achieve this GTP (GPRS tunneling protocol is being used).
• GTP is application layer protocol which differentiate session based
on TEID (tunnil end identifier).
• UDP is used as a transport layer protocol.
• A bearer is a pipe that carry data from one node to another node.
• There are two types of GTP messages used one for control plane
and one for user plane.
• EPS bearer has following components like TEID , Transport layer
address, etc
3. GPRS Tunneling Protocol (GTP) in LTE
• GPRS Tunneling protocol is an important
IP/UDP based protocol used in GSM, UMTS
and LTE core networks.
• It is used to encapsulate user data when
passing through core network and also carries
bearer specific signalling traffic
between various core network entities.
• This protocol has several advantages which
will be discussed later.
4. Bearer in LTE
• UE <------------------------------>enb<---------------------------------->SGW <---------------------->PGW<------->Internet
• The pipes, which are carrying data from PGW to UE and vice versa called
EPS bearer.
• when data reaches at PGW from external world it process and create a
GTP-U packet and sent to SGW.
• SGW does the same thing it remove the GTP-U header received from PGW
and create a new GTP-U header then forward packet to eNB.
• Once eNB receives GTP-U packet it removes header GTP-U header and
then PDCP layer at enodeb performs IP header compression and ciphering
and map to logical channel
• then message sent to UE through radio channel. radio bearers identified
by bearer Identity (1-32) and logical channel identity(3-11).
6. Why is GTP used in LTE?
• It provides mobility. When UE is mobile, the IP
address remains same and packets are still
forwarded since tunneling is provided between PGW
and eNB via SGW
• Multiple tunnels (bearers) can be used by same UE
to obtain different network QoS
• Main IP remains hidden so it provides security as
well
• Creation, deletion and modification of tunnels in
case of GTP-C
7. GTP Interfaces in LTE
• In LTE, version 2 is used for GTP-C and version 1 is used for GTP-U
• In simple LTE network implementation, GTP-v2 is used on S5 and S11 interfaces and GTPv1 is used on S1-
U, S5, X2-U interfaces (as shown below). In inter-RAT and inter PLMN connectivity, S3, S4, S8, S10, S12 and
S16 interfaces also utilize GTP protocols
version 1 GTP-U
version 2 GTP-C
8. How GTP-U Works ?
• GTP-U encapsulation of UE user plane traffic can be easily understood by taking any simple example. Lets
see what happens when IP packet generated by UE reaches to eNodeB and is then forwarded to SGW.
• Consider any application on UE creates an IP/TCP packet. This packet consist of actual data by application,
TCP or UDP header and then IP field information which has source address of UE and destination address
of application server (e.g. Facebook)
• When the eNodeB receives this packet over air interface, it will put the IP packet inside GTP header which
has information related to tunnel IDs. Then further, it is encapsulated inside UDP and IP header and
forwarded as ethernet frame towards SGW. Here the IP header contains eNodeB IP as a source address
and SGW IP as a destination address
9. GTP-C signalling messages
As GTP-Cv2 in LTE is used for tunnel management,
some of the signalling messages are listed below
which use GTP-Cv2 protocol
10. What is Bearer..??
• Bearer is just a virtual concept.
• It defines how the UE data is treated when it travels across the network.
• Network might treat some data in a special way and treat others normally.
• Some flow of data might be provided guaranteed bit rate while other may
face low transfer.
• In short, bearer is a set of network parameter that defines data specific
treatment
• e.g. Person A will always get at least 256 Kbps download speed on his LTE
phone while for person B there is no guaranteed bit rate and might face
extremely bad download speed at times
11. Default Bearer
• When LTE UE attaches to the network for the first time, it will be assigned
default bearer which remains as long as UE is attached.
• Default bearer is best effort service.
• Each default bearer comes with an IP address.
• UE can have additional default bearers as well.
• Each default bearer will have a separate IP address.
• QCI 5 to 9 (Non- GBR) can be assigned to default bearer.
• Default bearer is one of the main bearer which is created at the time of
initial attach procedure or at the time of new PDN connection. Default
bearer represents a PDN connection and exists until UE gets detached
from network or UE initiated PDN dis-connectivity explicitly or network
force fully trigger release for the default bearer due to policy control.
Default bearer is a non-GBR bearer and provide always on IP connectivity.
12. Dedicated Bearer
• To put it simple, dedicated bearers provides dedicated tunnel to one or more
specific traffic (i.e. VoIP, video etc).
• Dedicated bearer acts as an additional bearer on top of default bearer.
• It does not require separate IP address due to the fact that only additional default
bearer needs an IP address and therefore dedicated bearer is always linked to one
of the default bearer established previously.
• Dedicated bearer can be GBR or non-GBR (whereas default bearer can only be
non-GBR).
• For services like VoLTE we need to provide better user experience and this is
where Dedicated bearer would come handy.
• Dedicated bearer uses “Traffic flow templates (TFT)” to give special treatment to
specific services
• Dedicated bearer is created when the requested service can't be fulfilled through
default bearer. Some services required a high level of QoS like voice call. so
network create a dedicated bearer with required QoS . Dedicated bearer may be
Non-GBR or GBR depend of qci(QoS class identifier) value. dedicated bearer can be
created/release based on requirement but default bearer is created only all on IP
connectivity and released only at the time of detach/PDN disconnection.
13. Two default and One dedicated
bearer
• Usually LTE networks with VoLTE implementations has
two default and one dedicated bearer
•
Default bearer 1: Used for signaling messages (sip
signaling) related to IMS network. It uses qci 5
•
Dedicated bearer: Used for VoLTE VoIP traffic. It uses
qci 1 and is linked to default bearer 1
•
Default bearer 2: Used for all other smartphone traffic
(video, chat, email, browser etc)
14. Why dont we use dedicated bearer
for ims signaling as well ?
•
IMS network is separate network from normal
internet.
• And it comes with its own APN.
• Therefore we need separate default bearer
for IMS network.
• This also helps in separating IMS traffic from
normal internet traffic as well
15. How it is decided to send voip traffic
on dedicated bearer?
•
Both UE and eNB has TFT which has rules for
certain services. For example, incase of VoLTE
voip traffic, the rule are defined on the basis
of protocol number , destination network ip
network etc
• TFT----Traffic flow Template
16. How is dedicated bearer linked to
default bearer?
• The value of "Linked EPS bearer identity" defined in setup info
of dedicated bearer is used to link dedicated bearer to default
bearer
17. FAQ
• What are the information that Default EPS has but Dedicated EPS bearer does not ?
• The answer is "APN Name" and "PDN type/PDN Address".
• Then What kind of PDN address does Dedicated EPS Bearer will use ?
• The answer is "Dedicated EPS Bearer uses the PDN address of Default EPS Bearer it is linked to".
• Then how a Dedicated EPS Bearer knows which Default EPS Bearer it is linked to ?
• The answer is that it is via a information element called "Linked EPS Bearer Identity" (See the arrow
shown in the picture above)
• What are the information that both Default EPS Bearer and Dedicated EPS Bearer has ?
• The answer is "QCI".
• Can Default EPS Bearer and Dedicated EPS Bearer can have the same QCI value ?
• The answer is "No, they must have different QCI value".
• What is the relation between Default EPS Bearer and an APN ?
• The answer is "there is one-to-one relationship between them. One Default EPS Bearer is alllocated
for one APN.