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GPRS/EDGE.

Viewing 9 posts - 1 through 9 (of 9 total)
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  • #61677 Reply
    SAM
    Guest

    Dears,

    Can anyone explain me for GPRS/EDGE, suppose I have 2TRX in one cell and I have 2 SDCCH and 2 PDCH (1 dedicated and 1 dynamic PDCH). Now my question is only this 2 assigned PDCH will be used for DATA traffic? What will be the data rate for this 2 PDCH (CS1,CS2,CS3,CS4)? If I want to use more TS for DATA if there is no voice load in the cell do I have to increase the number of PDCH ??

    #61678 Reply
    pix
    Guest

    hi sam,

    yes, only 2 PDCH available in your cell
    the data rate depends on your parameter settings (which system are you using ?)
    yes, you should increase the nuber of dynamic PDCH. In the voice load is low, the PDCH will increase. If voice is high, PDCH are going to decrease.

    pix

    #61679 Reply
    SAM
    Guest

    Thanks Pix,

    We have Siemens system. GPDPDTCHA is the parameter that you are talking?

    Thanks.

    #61680 Reply
    pix
    Guest

    oh, i don’t know siemens, sorry… the concept is correct, but i cannot translate it in parameters.

    cheers
    pix

    #61681 Reply
    Mithu
    Guest

    Dear Sam,
    If u use only CS1~CS4(9.05~21.4Kbit/s), for better data rate u have to ensure better radio envoroment.U can also modify the parameter setting GMANMSAL to control the no of MS per PDCH in the cell.
    If u have EDGE license u can enable EEDGE parameter & improve throughput(data rate) by assinging coding scheme MCS1~MCS9(Upto 59.2Kbit/s). By using parameter GPDPDTCHA u can dynamically use cs ts as ps ts. u can assign value 100/50 depends using 100% or 50% of free TCH.

    #61682 Reply
    SAM
    Guest

    Thanks Mithu.

    #61683 Reply
    NJ
    Guest

    Hi Sam,
    In Siemens the parameter is, for edge: EMANPRESPRM,
    and for gprs:GMANPRESPRM,
    the parameter:GPDPDTCHA is GPRS Percentage of dynamic PDTCH Available,indicates the % of available ‘shared’ tch
    may be used for GPRS traffic.

    Hope it can helps.

    NJ

    #61684 Reply
    pcs
    Guest

    Dear Sam,

    In Alcatel, we have 3 types of PDCH. THat is MAX_PDCH, MAX_PDCH_HIGH_LOAD and MIN_PDCH.

    MAX_PDCH = Dynamic + Max_High_LoadPDCH (>=Max_highLoadPDCH)

    MAX_PDCH_HIGH_LOAD = >=Min_PDCH
    Min_PDCH = Dedicated PDCH

    Example : Min_PDCH = 2, MAX_PDCH_HIGH_LOAD = 3, MAX_PDCH = 6

    It means ==> 2 PDCHs are only for data, can’t be seized by TCH, but when PDCH access increase, max PDCH can be used is 6 pdch. If PDCH utilized are 3 PDCHs (Max-PDCH_HighLoad), that 1 PDCH can’t be seized by TCH. But IF PDCH utilized is 4, 5, or 6, only 3 PDCHs can be seized by TCH, but not the 3 others.
    When PDCH numbers seized reach the minimum number of MAX_PDCH_HIGH_LOAD,then those PDCHs are unable to be used for TCH.

    From my Experience, it doesn’t matter if we want to increase the PDCH Number if the voice traffic is low.

    The speed/data rate of GPRS/EDGE also depends on Abis capcity. There is a mappign of PDCH allocation and Abis TS.

    In Alcatel, sites which have high GPRS/EDGE access are added 1 E1 Abis (max 2 Abis), then we allocate Abis TS for Data only, especially in 2nd abis. That will significantly increase the data access speed.

    Regrads,

    PCS

    #61685 Reply
    DKS
    Guest

    Hi PCS,
    Will you give some light on the PDCH mapping on Abis link. How it is defined what is the calculation beyond this.

    DKS

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