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BLER

Viewing 14 posts - 1 through 14 (of 14 total)
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  • #56269 Reply
    Bob
    Guest

    Dear
    I want to know what is the acceptable BLER for GPRS/EDGE and WCDMA

    #56270 Reply
    Pan
    Guest

    Dear, Bob!
    Under BLER you are meaning Block Error Rate? If so, then BLER (or SDU error rate in GPRS) requirement are very dependent from used traffic class (or service type) and application requirements.

    #56271 Reply
    Pix
    Guest

    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 ๐Ÿ™‚ (radio aspects I think)

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

    #56272 Reply
    paraHO
    Guest

    GSM 05.33
    3GPP 45.003

    #56273 Reply
    Pix
    Guest

    Incredible, this guy is a machine… :))

    Thanks Pan ๐Ÿ˜‰

    #56274 Reply
    paraHO
    Guest

    Your welcome Pix :-))))))

    #56275 Reply
    Pan
    Guest

    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:)

    #56276 Reply
    pix
    Guest

    I’m sure Bob’s gone. He was just here to entertain us with a question ๐Ÿ™‚

    Like a guy throwing a stick to entertain a dog. He doesn’t really care whether the stick is brought back or not….

    #56277 Reply
    bob
    Guest

    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.

    #56278 Reply
    Pix
    Guest

    Hi Bob,

    I don’t understand your previous message.
    I suppose you’re thanking us ? In a weird way.

    #56279 Reply
    Pan
    Guest

    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.

    #56280 Reply
    Pix
    Guest

    And as the monthy python once sang:

    “Always look at the bright…

    …side of your life

    tu tudu tidudidudidu”

    #56281 Reply
    bob
    Guest

    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.

    #56282 Reply
    Pix
    Guest

    ParaHO > Sorry, i thought you were PAN… sorry for the mistake.

    Bob > Ok… but please, before I loose your friendship forever, notice that my “technical” answer is totally answering your question, and is very respectfully written. Furthermore, it pointed you to the right 3GPP doc.

Viewing 14 posts - 1 through 14 (of 14 total)
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