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doubt on inter bsc and intra bsc handove

Viewing 11 posts - 1 through 11 (of 11 total)
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  • #63975 Reply
    manish
    Guest

    HI all,

    i have one confusion abt intra bsc and inter bsc handover

    if i have MSC A AND BSC A,BSC B ARE UNDER THIS MSC A

    AND MSC B AND BSC 1 ,BSC 2 ARE UNDER THIS

    THEN FROM BSC A TO BSC 1 HANDOVER CALLED INTER BSC HANDOVER?

    AND BSC A TO BSC B HANOBER CALLED INTER OR INTRA BSC HANDOVER?

    AND GUYS ONE MORE CONFUSION WHICH ARE INTERNAL AND EXTERNAL HANDOVER?

    #63976 Reply
    manish
    Guest

    Plz help …….

    #63977 Reply
    SHELDON
    Guest

    Hi Manish,

    Inter-BSC handover: handover between cells on different BSCs.

    Intra-BSC handover: handover between cells on the same BSC.

    Both cases you described are inter-BSC handovers. However, the first case is also an inter-MSC handover.

    I’m not sure what you mean by internal handover…maybe it’s your vendor’s vocabulary. However, I think an internal handover will be the same as an intra-BSC handover, and an external handover an inter-BSC handover.

    Regards,
    SHELDON

    #63978 Reply
    manish
    Guest

    Hi sheldon,

    thanks buddy now cleared the doubt .but next question is that we have inter bsc handover problem so by tunning t3121 from 20 to 25 sec will help or its good to stick with 20 sec value?

    and other timer like t3103,t7,t8 will help and how this timer works plz tell waiting……

    #63979 Reply
    manish
    Guest

    Hi,

    sheldon plz help..

    #63980 Reply
    pix
    Guest

    manish,
    what do you mean by “inter bsc ho problems” ?

    can you share your HO KPIs ?
    preparation success rate
    efficiency rate
    # of requests, allocations and success (in both directions)

    regards

    pix

    #63981 Reply
    manish
    Guest

    Hi pix,

    buddy i have inter bsc problem everywhere where the boundrays of bsc are coming and ITS LIKE bsc A WITH ITS CELL 1
    AND BSC B WITH ITS CELL 4 SO HANDOVER FROM CELL 1 TO CELL 4 AND CELL 4 TO CELL 1 WHICH ARE INTER BSC HANDOVER IN THAT HO SUCESS RATIO IS POOR

    ITS LIKE HANDOVER FROM CELL 1 TO CELL 4 ARE 100 AND OUT OF THAT SUCCESS ARE ONLY 50 TO 60.

    AND THIS SCENARIO IS EVERYWHERE IN BY INTER BSC CELLS HANDOVER.

    SO I PUT THIS Hi sheldon,

    thanks buddy now cleared the doubt .but next question is that we have inter bsc handover problem so by tunning t3121 from 20 to 25 sec will help or its good to stick with 20 sec value?

    and other timer like t3103,t7,t8 will help and how this timer works plz tell waiting……

    SO PLZ HELP IF THIS TIMER WILL HELP OR NOT AND IF ANY OTHER SOLUTION PLZ SUGGEST?

    #63982 Reply
    jack
    Guest

    i have one doub about inter bsc (external handover)
    BSC s are NOKIA and MSC s are Ericson.
    after that BSC recognise that an External handover is required BSC send a HANDOVER_REQUIRED msg to MSC(ericsson) and After receiving a HANDOVER_REQUIRED message from the BSC, the MSC determines the candidate cell(?) and sends a HANDOVER_REQUEST message to the target BSC. When the BSC receives this message, the handover attempt is started. The message contains, for example, information on the cell identifier of the candidate cell.

    my doubt is on ? in my previous statement.
    How does MSC recocnise exactly the BSC of target cell??
    is it true?
    MSC only Know LAC of one cell and know that this LAC belong to which BSC?
    how about this position if one LAC consist of several BSC?
    how does MSC recognise to witch BSC the cell belngs??

    #63983 Reply
    jack
    Guest

    how does MSC specify the target cell from the list of candidate cell that BSC send to it?
    is rxlev is important?
    i mean that the cell with highest rxlev is picked???

    #63984 Reply
    pix
    Guest

    jack,

    the serving BSC sends a list that contains only N_PREF_CELLS (usually 3, or 1). This list is ordered accordingly to the BSC candidate evaluation algo. The MSC selects the 1st cell.

    regarding the LAC vs BSC :
    I don’t have the explanation, but i just know the MSC knows where each cell is located 🙂 In the MSC, there is a table that links LAC with BSC, and probably other tables that links the cell with the BSC.

    regards
    pix

    #63985 Reply
    SHELDON
    Guest

    Hi Manish,

    Sorry for my late reply.

    From what I found out, T3121 only applies to 2G to 3G handovers, so I don’t think tuning it will improve your handover success rate in any way. In any case, 20s is long enough for a handover to take place.

    T3103 is used to reserve the old channel so that in case the activation of the new channel fails, the call can return to the old channel. Thus, tuning it will also not improve handover success rate.

    T8 applies in inter-BSC handover and T7 in inter-MSC handover. Unless your problem is related to these, you should not touch these timers.

    From my experience, the majority of handover failures occur as a result of interference, hardware faults or poor synchronization. If your target cell is congested, you can also have handover failures. I think you should focus on these, rather than the timers.

    Regards,
    SHELDON

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