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CafeTele
United States
Приєднався 5 бер 2019
Welcome to CafeTele, an educational division of the Cafetele Company, where telecom education becomes accessible to everyone, everywhere. Our channel is dedicated to providing insightful and in-depth training on 5G, 4G and O-RAn technologies.
Through the power of UA-cam, we democratize knowledge and break down complex technological concepts into digestible, easy-to-understand videos. We are not just a UA-cam channel, we are a global classroom bringing together telecom professionals from all corners of the world.
At 5G 6G O-RAn, we believe that quality education should never come with a price tag. That's why we offer our comprehensive tutorials and guides absolutely free of charge.
Join us on this enlightening journey and together let's redefine what's possible in the world of telecommunications. Here's to building a smarter, better-connected world, one video at a time.
Through the power of UA-cam, we democratize knowledge and break down complex technological concepts into digestible, easy-to-understand videos. We are not just a UA-cam channel, we are a global classroom bringing together telecom professionals from all corners of the world.
At 5G 6G O-RAn, we believe that quality education should never come with a price tag. That's why we offer our comprehensive tutorials and guides absolutely free of charge.
Join us on this enlightening journey and together let's redefine what's possible in the world of telecommunications. Here's to building a smarter, better-connected world, one video at a time.
HARQ Process in 5G NR
Overview of HARQ
HARQ is a protocol used in wireless communication to improve data transmission reliability over unreliable channels. It combines:
Automatic Repeat reQuest (ARQ): Requests retransmission of data packets when errors are detected.
Forward Error Correction (FEC): Adds redundancy to the transmitted data, allowing the receiver to correct some errors without needing retransmission.
By integrating ARQ and FEC, HARQ allows the receiver to use both the original and retransmitted data to improve decoding success, enhancing overall system performance.
HARQ in 5G NR
In 5G NR, HARQ operates at the Medium Access Control (MAC) layer and is crucial for ensuring data integrity. Here are the key features:
1. Asynchronous and Adaptive Retransmissions
Asynchronous HARQ:
Downlink and Uplink: Unlike LTE, which uses synchronous HARQ in the uplink, 5G NR employs asynchronous HARQ in both downlink and uplink.
Benefit: Provides greater scheduling flexibility, allowing retransmissions to occur at any time without fixed timing constraints.
Adaptive HARQ:
Modulation and Coding Scheme (MCS) Adjustment: The transmitter can adjust the MCS for retransmissions based on current channel conditions.
Benefit: Enhances link adaptation and improves throughput under varying signal quality.
2. Multiple Parallel HARQ Processes
HARQ Process IDs:
Identification: Each HARQ process is assigned a unique ID to manage multiple concurrent transmissions.
Number of Processes: 5G NR supports up to 16 or more HARQ processes per UE.
Benefit:
Increased Throughput: Multiple processes allow continuous data flow without waiting for acknowledgments, reducing idle time.
Latency Reduction: Enhances system responsiveness, crucial for low-latency applications.
3. Incremental Redundancy and Soft Combining
Incremental Redundancy (IR):
Retransmissions Carry Additional Parity Bits: Each retransmission includes different redundancy information, enhancing error correction capability.
Benefit: Improves the likelihood of successful decoding over successive transmissions.
Soft Combining:
Receiver Side Processing: The receiver combines the soft bits from the original and retransmitted packets.
Benefit: Increases the probability of correct decoding without needing perfect transmissions.
4. Acknowledgment Mechanism
ACK/NACK Feedback:
ACK (Acknowledgment): Sent when data is correctly received.
NACK (Negative Acknowledgment): Sent when errors are detected.
Physical Channels Used:
PUCCH (Physical Uplink Control Channel): For UEs to send feedback to the gNB.
PDCCH (Physical Downlink Control Channel): For gNB to schedule retransmissions.
Benefit:
Efficient Error Detection: Allows the transmitter to know promptly whether to proceed or retransmit.
HARQ is a protocol used in wireless communication to improve data transmission reliability over unreliable channels. It combines:
Automatic Repeat reQuest (ARQ): Requests retransmission of data packets when errors are detected.
Forward Error Correction (FEC): Adds redundancy to the transmitted data, allowing the receiver to correct some errors without needing retransmission.
By integrating ARQ and FEC, HARQ allows the receiver to use both the original and retransmitted data to improve decoding success, enhancing overall system performance.
HARQ in 5G NR
In 5G NR, HARQ operates at the Medium Access Control (MAC) layer and is crucial for ensuring data integrity. Here are the key features:
1. Asynchronous and Adaptive Retransmissions
Asynchronous HARQ:
Downlink and Uplink: Unlike LTE, which uses synchronous HARQ in the uplink, 5G NR employs asynchronous HARQ in both downlink and uplink.
Benefit: Provides greater scheduling flexibility, allowing retransmissions to occur at any time without fixed timing constraints.
Adaptive HARQ:
Modulation and Coding Scheme (MCS) Adjustment: The transmitter can adjust the MCS for retransmissions based on current channel conditions.
Benefit: Enhances link adaptation and improves throughput under varying signal quality.
2. Multiple Parallel HARQ Processes
HARQ Process IDs:
Identification: Each HARQ process is assigned a unique ID to manage multiple concurrent transmissions.
Number of Processes: 5G NR supports up to 16 or more HARQ processes per UE.
Benefit:
Increased Throughput: Multiple processes allow continuous data flow without waiting for acknowledgments, reducing idle time.
Latency Reduction: Enhances system responsiveness, crucial for low-latency applications.
3. Incremental Redundancy and Soft Combining
Incremental Redundancy (IR):
Retransmissions Carry Additional Parity Bits: Each retransmission includes different redundancy information, enhancing error correction capability.
Benefit: Improves the likelihood of successful decoding over successive transmissions.
Soft Combining:
Receiver Side Processing: The receiver combines the soft bits from the original and retransmitted packets.
Benefit: Increases the probability of correct decoding without needing perfect transmissions.
4. Acknowledgment Mechanism
ACK/NACK Feedback:
ACK (Acknowledgment): Sent when data is correctly received.
NACK (Negative Acknowledgment): Sent when errors are detected.
Physical Channels Used:
PUCCH (Physical Uplink Control Channel): For UEs to send feedback to the gNB.
PDCCH (Physical Downlink Control Channel): For gNB to schedule retransmissions.
Benefit:
Efficient Error Detection: Allows the transmitter to know promptly whether to proceed or retransmit.
Переглядів: 41
Відео
5G NR NSA Option 3
Переглядів 10521 день тому
1. Option 3 - Non-Standalone (NSA) Option 3 is the initial phase of 5G deployment, utilizing the existing LTE network as the anchor for control signaling while leveraging 5G NR (New Radio) for enhanced data capabilities. This configuration is known as Dual Connectivity (DC), where the LTE network acts as the control plane anchor, and the 5G NR nodes are used as a secondary pathway for data traf...
5G MIMO
Переглядів 7021 день тому
What is MIMO? MIMO stands for Multiple-Input Multiple-Output. It's a clever technique used in wireless communications (like 5G, 4G, and Wi-Fi) to boost data speeds and improve signal quality. The Basic Idea Imagine you need to send a package across a crowded room. Instead of throwing one big package, you could split it into several smaller ones and have multiple people throw them simultaneously...
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Переглядів 2006 місяців тому
Introduction: 5G networks offer significant improvements in speed and efficiency, but a key feature is their ability to manage and prioritize different types of traffic through Quality of Service (QoS). The diagram showcases how 5G networks ensure specific traffic requirements are met, whether it's low latency for gaming or high bandwidth for video streaming. Components: Application Layer: This...
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5G NR Radio Link Control (RLC) Protocol The RLC protocol is a crucial component of the 5G New Radio (NR) air interface. It resides between the Medium Access Control (MAC) layer and the Packet Data Convergence Protocol (PDCP) layer and is responsible for efficient and reliable data transmission over the radio link. Functions of RLC NR Protocol: Segmentation and Reassembly: RLC can segment large ...
Packet Data Convergence Protocol (PDCP) 5G
Переглядів 8628 місяців тому
The Packet Data Convergence Protocol (PDCP) in 5G New Radio (NR) plays a crucial role in the air interface protocol stack, interfacing between the Radio Link Control (RLC) layer and the upper layers of the network, such as the IP layer. PDCP performs several key functions to ensure efficient and secure data transmission over the air interface in 5G networks. Here are the main functions and feat...
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Learn OPEN RAN (O-RAN) in just three Hours Presented by Abhijeet Kumar
Переглядів 15 тис.2 роки тому
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Access & Mobility Management Function (AMF) 5G
Переглядів 2,2 тис.3 роки тому
Access & Mobility Management Function (AMF) 5G
I heard 7G is suppose to be 6G perfected obviously faster but better
13:41 Why UE is directly connected to AMF..instead of this RAN should be the act as mediator? I don't understand the logic behind this?
UE is logically connected to the AMF but its physically connect through the RAN
😊
"PromoSM"
Nice information. Thank you!
Hi sir very good explain i am also working telecom field IBS engg (operation& maintenance) Jio network now any coaching centre pls inform me i am waiting for you good reply
Good stuff....Sounds a little bit funny..." okay?....okáy?"...
Excellent description of 5G resource allocation.
Thank you @tmasson
Excellent
can i get pptx please ?
how data packet being sent from EGTPU to SDAP.. whiach is id through which data packet being sent from EGTOU to SDAP . Please give me the id or iE name
Can I get this ppt?
Can you please share features of 5G Private network along with what are all the KPIs/Counters to be monitor?
Thanks Abhijeet for sharing this.
very nice
Time stamp 29:00 if RF part also handle by the DU then what is work of RU. where u r explaining option 6 and option 7 LLS functionality.
What happened to the MBMS channels?
where i can find this course or all sessions
same here where can /how can we find the course for these sessions
is there somewhere a table, which split is best for which use case eMBB etc? Also do you expect, that the split will change on-the-fly, or do you assume, that the split stays in the DU/CU once implemented.
Lower layer split is between CU and DU or DU and RU
What is the function of Mac control
excellent
Awesome content....Very helpful..Thanks
Glad it was helpful!
Can u please also share the presentation as well?
Very Detailed explanation.. and exactly what I was looking for.. Thanks for such a nice presentation...Keep it up..
very informative. Is it possible to have the ppt of this session?
How do I get in contact with you?
My what’s number is +919230112233
Hello , can I have your email to communicate with you, I am interested in the 4G. Thank you
did not understand anything
Endc at 14mns
Option 3
Thank you for this...
My pleasure!
Very useful video
Glad you liked it
Excellent one and tq for your great efforts sir
You're most welcome
Excellent one sir and tq for uploading this kind of resource......
You are most welcome
Very nicely explained. Kudos Bro
Glad you liked it!
Very good explanation,can you please share the slides as well?
Very good explanation,can you please share the slides as well?
Very good explanation,can you please share the slides as well?
Good Material Abhijit !!! 👍
What is pdu sdu? in lte or NR rlc mac layer all steps some time we are using sdu, some time pdu, please clarify my doubt....
For the basic understanding think of sdu as incoming data and pdu as the outgoing data.
How can i get in touch with you? as a beginer and does not have any ideal about computing, can i learn about your program?
Please send me your your request at info@cafetele.com
Excellent presentation! Thanks very much for share it
Any ideas about available books explaining the C++ programming for the wireless Layer 2 protocol on RTOS for the 4G LTE
Can I start as a fresher? Could some provide the pdf on this?
Nice presentation Kyzys.Thank you Russell
Very nice presentation Kyzys...hope to see more of these in the near future. Thank you Russell....see you soon..
Hello Russell and Abhijeet.....see you soon....
Too good
Thank you Mukund
Can you upload lesson on pdcp, RLC, Mac & physical layer in detail. How the data is processed by each entities
I expected this review to be in plain English. 👎