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GSM Frame structure

Viewing 11 posts - 1 through 11 (of 11 total)
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  • #59556 Reply
    guru
    Guest

    pls answer how 26&51 frame works

    #59557 Reply
    Lex
    Guest

    51 frame structure is used in idle mode as it consist of Bcch,rach,ccch,sdcch frames, Rach is only up link channel on 51 frame structure.

    26 frames comes in pic only in dedicated mode it consist of tch and sacch frames, the measurment for handover are sent on sacch frames .

    #59558 Reply
    guru
    Guest

    Thanks a lot can you give me more clarity on how the same frames are placed on time slot….

    #59559 Reply
    Lex
    Guest

    Hi guru,
    This 51 and 26 frames are the logical channel .
    The tdma frame of 8 time slots(physical channel), on which the time slot 0(bcch time slot) contains the 51 multiframes and repeates on every ts0 of tdma frame,and the 26 multiframe is placed on tch ts .

    #59560 Reply
    guru
    Guest

    Thanks a lot lex

    #59561 Reply
    Thomas Tukai
    Guest

    I realize that 900 cells are carrying more sdcch traffic than 1800.i have try to change some parameters like cro,crh,layerthr but still no changes.by having different values on accmin for 1800 and 900 can it be a reason?

    #59562 Reply
    Bijoy
    Guest

    Thomas
    Yes,it is one of the factors indeed since pathloss will be more on 1800.

    Br\\
    Bijoy

    #59563 Reply
    Lex
    Guest

    Hi
    If i need to reduce rach retransmission then which parameter i need to reduce.

    #59564 Reply
    Bijoy
    Guest

    MAXRET

    #59565 Reply
    YUVI
    Guest

    PLZ TELL ME SOMETHING ABOUT SDH AND PDH???

    #59566 Reply
    ajay
    Guest

    pls answer how 26&51 frame works

Viewing 11 posts - 1 through 11 (of 11 total)
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