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RF Contest!

Viewing 15 posts - 16 through 30 (of 72 total)
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  • 15th February 2008 at 09:54 #50843
    Tufail
    Guest

    Hi,

    Funny

    But I appreciate your try.

    Rgds

    tufail

    15th February 2008 at 10:50 #50844
    Huawei RF
    Guest

    So?? No answers for this question:

    What do we mean when saying “the system possesses perfect power control”?

    rnp_rno_engineer@yahoo.com

    15th February 2008 at 17:18 #50845
    Pix
    Guest

    I never said that… but that’s because i don’t work in wcdma networks, i suppose ?

    17th February 2008 at 14:59 #50846
    Huawei RF
    Guest

    Power control is not a feature of CDMA only! It works with GSM too..

    17th February 2008 at 15:56 #50847
    Pix
    Guest

    I thought the “perfect” power control was a wcdma feature… I’m working in GSM, and i’ve never heard such a thing as “perfect” power control… Power control tends to become perfect after I optimized it though :)))

    17th February 2008 at 17:33 #50848
    Abdel
    Guest

    Wait may be this is a vendor specific feature used by Huawei BSC, I have seen a lot of Handover features on the Huawei BSC6000 which I didn’t see before. If this is right, I would suggest instead of asking vendor-specific features we can ask each other questions which are based on the basic and advanded parameters that can be found in every BSC or RNC plaftform.

    Thanks

    17th February 2008 at 18:14 #50849
    Huawei RF
    Guest

    Well, no… it is not a Huawei BSC feature…
    And it is a BASIC QUESTION… and can be found in any mobile communication book.

    Perfect power control is an ideal state… means that the transmitted powers of all mobile users are actively controlled such that at the base station receiver, the received powers from all mobile users are equal.

    17th February 2008 at 19:45 #50850
    paraHO
    Guest

    Huawei RF, the nearest feature I can think of for GSM that you mean when you say “perfect power” is called APC (Adaptive Power Control) which is there to prevent such things as Near-Far Effect. APC command can be sent with TA to regulate MSs operating at full power with regard how they might effect the base station, minimum coupling loss (MCL) of the radiating elements (ie the antennas) and so on based upon on how far MSs are from Mast. The objective is to stop MSs near to the Mast operating at full power that may cause dropped calls or at minimum high handover rate for mobiles that maybe on or in fringe/boundary area of coverage from the same Mast.

    18th February 2008 at 06:21 #50851
    Pix
    Guest

    ParaHO,

    That’s one of the first thing I try to say to optimizers : the timing advance is not an information that is used by any “radio” mechanism. It is just seen in 2 handovers causes, but that’s it.

    I believe that, for most vendors, the power control is based solely on the RxLev/RxQual and not at all on the Timing Advance. You can have a very low RxLev while being less than 500m from the antenna (indoor MS, for example).

    Of course, some vendors might choose another solution, but the TA … I don’t think it could work efficiently.

    Huawei_RF,

    Needless to say, nobody won this one ! You have another question ?

    18th February 2008 at 09:31 #50852
    Huawei RF
    Guest

    friends… perfect power control is an IDEAL case, not exists in the reality….
    It is assumed in theoritical calculations only… It doesn’t need all those arguments!!

    Anyway, it is your time to put a question… so, shoot pix

    18th February 2008 at 10:30 #50853
    paraHO
    Guest

    Thanks Pix, Useful advice for optimisers.

    I have slight query if you can help pls.

    I thought for analysis of MEAS_RES/MEAS-REO L1 information MS power lvl and MS TA were recorded in response to command from base station of APC+TA in same packet.

    18th February 2008 at 11:30 #50854
    paraHO
    Guest

    Sorry, poor typing. It should have read:

    MEAS_RES/MEAS-REP

    18th February 2008 at 14:42 #50855
    Pix
    Guest

    MS POWER and TA are sent in layer 1 each UL SACCH frame. It’s not a response to a command. The MS sends it as a continuous information. It is interpreted by the BSC as a reply to the previous DL command, so the BSC can adapt the content of the next DL command.

    Does it answer your question ?

    18th February 2008 at 14:51 #50856
    Pix
    Guest

    !!! CONTEST !!!

    CRO = PENALTY TIME = TEMPORARY OFFSET = 0

    when doing a drive test, there is a part where I leave cell 1 and reselect cell 2 normally : the RXLEV of cell 2 is greater than cell 1. But then the RXLEV of cell 1 becomes greater again by 1 to 5 dB.

    For the next 15 seconds, nothing happens : I stay on cell 2. Only after 15 seconds of such rxlev difference, I reselect cell 1.

    Can anyone explain to me why ? 🙂

    Solution tomorrow, unless someone finds the answer…

    18th February 2008 at 14:53 #50857
    paraHO
    Guest

    Hi Pix, thanks 😉

    It is what I was thinking but was unsure when I saw your earlier reply. But you clarify it for me now 🙂

    I had been checking out GSM04.06, 04.08, 04.18, 05.05, 05.50 etc

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