BLER

Bob,

In GPRS/EGPRS, there are different coding schemes, such as CS1 to CS4 in GPRS and MCS1 to MCS9 in EGPRS.
Each scheme provides a different useful throughput and a different protection ratio.
High tput with low protection or low tput with high protection.

As soon as the BLER becomes bad, the retransmissions rate increase… But then the link adaptation mechanism kicks in and the coding scheme is decreased, in order to provide more protection. The system choses to decreae the useful tput in order to give more protection.

As a direct consequence, the impact of bad BLER decreases. Retransmission rates are reduced, the receiver is able to decode the useful signal even under bad BLER conditions.

So you see, each coding scheme can accept a certain BLER. And this value for each CS can be found in 3GPP-something 🙂 (radio aspects I think)

Pan, our 3GPP master, what’s the ref number? 45 something? :))

Incredible, this guy is a machine… :))

Thanks Pan 😉

Many thanks, my friends! By means of our common effort, we will touch bottom and get a synergetic effect :)) But I am understanding Bob’s question as follows:
What is the minimum requirement for error ratio of various applications. I.e. maximum error ratio that is acceptable for different applications. May be I am a bit mistaken:)

No pix don’t be so sure of your self that your are answering question suppose your self as gsm master mind and for your information I was busy with doc of paraho post thanks for your help.

Yes, Pix, I think he is thanking. He omitted exclamation points in his sentences. It sounds like:
No pix don’t be so!
[I am] Sure of your self!
You are answering question!
Suppose your self as gsm master mind!
and for your information I was busy with doc of paraho post. thanks for your help!

It is thanks certainly.

No pan thanks is no for pix it is for paraho as i check some of his answer from posts he like to make fun of what are posted and one thing else for mr pix i think you become older and has no patient.