• 2 months ago
Video Series 02 : 5G Architecture and Key Principles :
Session 03 : 5G Control Plane & 5G User Plane Separation or CUPS in 5G .

Ever wondered what the 5G network actually looks like? In this video, we take a deep dive into the architecture of 5G, mainly CUPS (Control plane and User Plane Separation Concept in 5G) and we will know, how it differs from previous generations like 3G and 4G. We explain the structure of the network, focusing on User Equipment (UE), the Radio Access Network (RAN), and the 5G Core. You’ll also learn about Control-User Plane Separation (CUPS) and why it's critical for 5G’s low-latency and scalability.

Topics Covered:

* Overview of 5G Components: Understand the three major sections of a 5G network: User Equipment (UE), Radio Access Network (g-NodeB), and the 5G Core.
* Comparison with 3G and 4G: Learn how 5G follows a similar architecture to 3G and 4G, but with critical differences that make it more efficient.
* 5G User Equipment (UE): This includes not just smartphones but also modems, 5G routers, and IoT devices designed for fixed wireless access.
* 5G Radio Access Network (RAN): Discover how g-NodeB supports the New Radio (NR) air interface and how some nodes can operate on unlicensed spectrum.
* 5G Core Network: Learn how 5G's core is built using modern technologies like network virtualization and service-based architecture, making it more flexible and scalable.
* Control-User Plane Separation (CUPS): Explore the separation of control-plane and user-plane functions, allowing for better scalability based on network demands, and achieving the low latencies required for 5G applications.


Why CUPS is Critical for 5G:
* Efficient Scaling: In cases where the network needs to handle massive machine-type communications (mMTC) like IoT devices, control-plane scaling becomes crucial. For data-heavy use cases like mobile broadband, user-plane scaling is more important.
* Low Latency: Learn how separating control and user-plane functions helps achieve lower latencies, which is essential for real-time applications like autonomous vehicles and remote surgery.


We also take a look at how these concepts evolved from 4G and how 5G's control-plane and user-plane separation (CUPS) optimizes network efficiency, particularly in data-heavy environments.

Whether you're a beginner in telecom or a professional looking to deepen your understanding of 5G, this video breaks down the key components and architectural shifts of the 5G network in a simple, easy-to-understand way.



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Transcript
00:00Hi, in the last session, we understand the need of 5G technology and its advancements
00:05and we also talked about the variety of use cases which are planned to serve by 5G technology.
00:11Now in this session, we will be briefly talking about the 5G systems and control plane and
00:16user plane and curves in 5G.
00:19Ok, so before reaching to 5G, we should see that how 3G and 4G systems first look like
00:25and then we will compare that in brief with the 5G systems.
00:29So this is how the 3G systems look like.
00:323G systems have three main sections.
00:35The user equipment or UE like smartphones and modems.
00:39The radio access network or RAN which is also known as UTRAN.
00:46This is responsible for wireless access through the components like NodeB and the RNC, radio
00:52network controllers.
00:53And the last section is core network which consists of different functions like storage
00:59of subscriber data, security, policy management, mobility management, etc.
01:04Well, I am not going deep on these components at the moment.
01:08This is just a brief section.
01:10Now the 4G system, this also looks similar like we have user equipment, one radio access
01:16network which is called E-UTRAN in 4G and it includes E-NodeB and one core network,
01:22this is known as Evolved Packet Core or EPC core.
01:26This EPC or Evolved Packet Core also handles similar functions like 3G core but with little
01:33more advanced capabilities.
01:35Now continuing the trend, the 5G network also consists of user equipment, the radio access
01:40network and the core network.
01:43The 5G user equipment includes 5G enabled smartphones, laptops, tablets, modems, Internet
01:49of Things devices and even 5G routers for fixed wireless access.
01:54The 5G radio access network or 5G-RAN includes G-NodeB which supports the new radio interface
02:01called NR.
02:02In some cases, you might also see NG-NodeB which supports both NR and LTE technology.
02:10The 5G core network has the functions like storing subscriber data, mobility management,
02:15session management, etc.
02:17The defining aspect of the 5G core is that in 5G core, there is a clear separation of
02:23control plane and user plane functions and that allows more efficient and flexible network
02:29operations.
02:30The 5G core is designed with the modern software technologies including service-based architecture
02:36and network virtualization which make the network more adaptable and scalable.
02:41So as mentioned, separation of control plane and the user plane is one of the key principles
02:46of 5G architecture.
02:48So what is this control plane and user plane separation?
02:52Let's understand this with one example.
02:55Consider in some 5G use cases like massive machine type communications, there are many
03:00devices that sends small amount of data.
03:04When these devices are dominating in some network area, then there is a need to scale
03:08the control signaling infrastructure to handle them efficiently.
03:13On the other hand, we have mobile broadband devices and these devices create a large demand
03:18of user plane functions compared to the control signals because this handles more data flow.
03:24And if these devices are more common in some network, then the user plane need to be scaled
03:29up rather than the control signaling.
03:32So if there is no separation of control plane and user plane functions, we would have to
03:37scale both functions together even if only one of them needs it.
03:42And this would be an inefficient way of integration because it may create the wastage of network
03:47resources.
03:49By separating the control plane and user plane, we can scale each one based on the network's
03:54specific need.
03:56Separating control plane and user plane also helps achieving the lower latency which is
04:01crucial for 5G applications.
04:04This is the diagram of 4G system.
04:06So you can see that 4G system with the indication of control plane and user plane traffic.
04:12You can see that the control plane traffic marked in green and the user plane traffic
04:16is in orange.
04:18In the 4G system, at the top, both the serving gateway and packet gateway handles control
04:23plane and user plane functions, means it handles both of these data.
04:27But in the 5G core, at the bottom architecture, the control plane of serving gateway and packet
04:33gateway are combined together with parts of MME to form the session management function
04:38shown here as an SMF.
04:42The user plane of serving gateway and packet gateway forms the user plane functions, indicated
04:47here as UPF.
04:49This separation of control plane and user plane functions is known as CUPS, which stands
04:56for control and user plane separation.
04:58In 5G, the mobility management functions of the MME evolved into the access and mobility
05:04management functions, normally called as AMF.
05:08The HSS becomes User Data Management or UDM.
05:12And the PCRF turns into the Policy Control Functions or PCF.
05:17And all together they form the 5G core.
05:19Ok, so that's it for today.
05:21In the next session, we will be talking about 5G deployment strategies and options.
05:25So stay tuned for the updates.
05:27If you did not subscribe till now, then please do subscribe to learn and grow community for
05:31regular updates.
05:32If this video is informative, then please like this video, comment on video and don't
05:36forget to share.

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