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RF Contest!

Viewing 15 posts - 46 through 60 (of 72 total)
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  • #50873 Reply

    Case A: Mobile originating short message transfer, no parallel call.

    #50874 Reply

    Sorry I try lots of times and it not allow the other cases.

    If you want to email me pix I will send you the details.

    #50875 Reply

    Hi all,
    I work as a BSS Engineerin a cellular company in Tanzania, East Africa. I have two questions for those who have experience with Alcatel BTS.
    1. I have a new gsm site integrated recently with three sectors. Sector 1 and 3 are not carrying traffic at all. Althogh everythin seems to be ok. What might be a problem.

    2.When you have 900MHZ and 1800MHZ BTS operating at the same time, is it ok if you mount both antennas (900&1800) at the same position?

    Thanks in advance

    #50876 Reply


    thanks for the effort, i’ll get it from 3gpp, don’t worry. very interesting question ๐Ÿ™‚

    #50877 Reply

    For mobile originating and termining SMS where the mobile telephone has no parallel call in progress look at A and B and where a parallel call is in progress lookm at C and D. Where Inter MSC is involved look at E and F.

    #50878 Reply

    Must have been brain tired last night.. If I re-write instead of direct copy of info it seems to work… (see below)

    #50879 Reply


    1> Perform a drivetest and check that you can perform a call setup. A drivetest trace is the first step to understand this kind of problem. Also, at OMC-R, ensure, the cell is not locked, not barred, etc. Ensure that all parameters follow default recommendations from Alcatel

    2> what do you mean “same position” ? GSM900 antennas and DCS1800 antennas can be colocated on the same mast, but you must ensure few centimeters between them. From memory, i would say something like less than 30cm.

    #50880 Reply

    How many cell selection processes are their and cane you name them?

    C1, C2, …….. C?

    #50881 Reply

    you said “selection”, but You also include “reselection”, don’t you ?

    C1: selection & reselection if C2 not used. Used for PS idle and PTM reselection if no PBCCH.
    C2: reselection if C2 used. Used for PS Idle & PTM reselection if no PBCCH.
    C31: in case of PBCCH (obsolet)
    C32: in case of PBCCH (obsolet)

    …??? I count only 4… (and only 2 are useful)

    PTM reselection in case of NC2 may count too ? By memory alone, I’d say :
    PT1 : bad qual ul
    PT2: bad qual dl
    PT3 : bad lev dl
    PT4 : better cell
    but i think i mixed them up ๐Ÿ˜€

    for 3G and 4G… mmm… i forgot !

    #50882 Reply

    That was ok pix, here are some others:

    C1 Normal Cell Selection This is the process of initial cell selection, searching all RF channels.

    C2 Stored List Cell Selection This is the process of initial cell selection where BCCH carrier information (e.g. a BA list) for the selected PLMN is stored in the MS.

    C3 Camped Normally This is where the MS is camped on a cell of the registered PLMN and may be able to make and receive calls. (Whether or not the MS can make and receive calls depends on the state within the location registration process). The MS monitors received level and the system information and checks whether cell reselection is needed.

    C4 Normal Cell Reselection This is where the MS has determined that cell reselection is needed and an attempt is being made to reselect a new cell.

    C5 Choose Cell This is where the MS has returned to idle mode from “connected mode” and is choosing a suitable cell to camp on.

    C6 Any Cell Selection This is where the MS is unable to camp normally on any cell of the selected PLMN, or cannot obtain service because of certain responses to a location registration (LR) attempt. It is searching for a cell of any PLMN to camp on (so that emergency calls can be made and warning notifications can be received).

    C7 Camped on any Cell This is where the MS has camped on a cell irrespective of its PLMN identity, so that emergency calls can be made and warning notifications can be received.

    C8 Any Cell Reselection This is where the MS is attempting to reselect a cell, irrespective of PLMN identity.

    C9 Choose Any Cell This is where the MS is returning to idle mode, after having entered “connected mode” from the “camped on any cell” state to make an emergency call. It is attempting to find an acceptable cell to camp on

    #50883 Reply

    Forgot to put

    3GPP TS 43.022

    #50884 Reply

    Very Nice discussion
    How did I missed this.

    #50885 Reply

    the key word in your question being “processes” ๐Ÿ™‚
    well, thanks, that was a nice (but insane) one.

    Now we know more about how a MS thinks ๐Ÿ˜€

    What distinguishes a SAIC “Legacy” MS from a “VAMOS level 1” MS, in terms of VAMOS capabilities?

    What distinguishes a “VAMOS level 2” MS from a “VAMOS level 1” MS, in terms of VAMOS capabilities?

    (focus on the major differences, related to RF engineering !)

    #50886 Reply

    1.SAIC MS—GMSK Modlation,Poor SCPIR performance.VAMOS L1–AQPSK modulation,New TSCs,better SCPIR performance……

    2.VAMOS L2–Advanced receiver,better SCPIR performance,complex to implement…….

    What is your say.


    #50887 Reply

    well done bijoy ! some minor corrections to be noted though.

    ok, let’s go :

    1. VAMOS L1–
    + TSC from Set 2 available
    – same SCPIR performance than SAIC MS (in reality, *some* SAIC phones are showing problems at low SCPIR)
    – same modulation (AQPSK is used in DL by the BTS, MS is not aware of it)

    2.VAMOS L2–
    Same as L1, plus :
    + Advanced receiver -> better SCPIR performance than L1 and SAIC MS
    + support shifted SACCH

Viewing 15 posts - 46 through 60 (of 72 total)
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