5G Throughput Optimization

This is the 2nd article for 5G Throughput Optimization where it is discussed how BLER target plays an important role in 5G link adaptation. The BLER target is usually around 10% based on specifications but it can be varied depending on the characteristics of the cell. This is explained in detail in this session along with the definition of BLER and its types.

5G Throughput Optimization Basics #2 – BLER Target: Fixed Or Variable?

BLER is Block Error Rate and it is basically the decoding failure rate of Transport Blocks or in simple words, the decoding failure rate of data blocks.

Naturally, higher BLER is bad and lower BLER is better but there are some additional rules that govern the BLER Targets.

The Scheduling uses the IBLER which is the Initial BLER based on the first retransmission instance.

If the user has a small traffic demand and it gets small number of resources then a retransmission overhead is also small

However, if the user has a high traffic demand, then it would get a large number of resources. Thus a retransmission of all those resources will create a much bigger overhead.

The usual BLER Target is around 10%. However, it has been observed that -Users in Good Radio conditions or with high traffic utilization (full buffer) perform better with lower BLER Targets -Users in Poor Radio conditions or with small packets perform better with Higher BLER Targets.

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Ali Khalid

5G NR | VoLTE | LTE-A | Massive MIMO | NB-IoT | NDO Network Specialist at Ericsson, Australia
Ali Khalid is a Senior LTE/VoLTE RNPO, NB-IoT and 5G Solution Architect who has successfully led and delivered a number of projects in different regions across the globe including Pakistan, Bahrain, UAE, Qatar, Oman, KSA, Nigeria, Turkey, Poland and Japan. He is currently working in Strategic Competence Unit (SCU), a highly experienced global team at Ericsson, Australia. In case of any questions or feedback, please feel free to drop a comment below or connect with him on LinkedIn.

8 thoughts on “5G Throughput Optimization Basics #2 – BLER Target: Fixed Or Variable?”

  1. How about if using realtime application likes WhatsApp Call or Zoom or Skype? Is there any threshold of BLER need to adjust ?

  2. I must say that this article on 5G throughput optimization is incredibly informative and well-written! The explanation of whether to use a fixed or variable BLER target is concise and easy to understand, making it accessible to both beginners and experts in the field. I appreciate the time and effort the author has put into creating such valuable content for the community. Thank you so much for sharing your knowledge and insights with us – it’s truly an asset for anyone looking to grasp the intricacies of 5G technology. Keep up the fantastic work!

  3. Great work on the BLER image you posted. Makes it simple to understand the percentage better depending on distance(signal strength) and the type of data being pulled.

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