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Alcatel HPTRE vs MPTRE.

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  • #50331 Reply
    rala
    Guest

    Could someone tell me..
    For Alcatel equipment,
    we would like to build up the sector configuration more than 2 TRX.
    Have someone ever use the ANC and ANY with HPTRE(high power TRX)instead of use the double antenna and the ANC with MPTRE(Medium power)? How much the coverage effect? Thank you very much.

    #50332 Reply
    pix
    Guest

    Rala,

    “double antenna”, you mean two outputs ? Because the two ouputs can be connected to only one crosspolar antenna.

    So 4 TRX into 1 ANC = 2 outputs = 1 Crosspolar antenna

    Instead, you want to plug 4 TRXs in order to have only 1 output ?
    You’ll have to use 1 ANy and 1 ANC
    4 TRXs –> ANy –> ANC
    Possible, but you will not have RX DIVERSITY (obviously)
    Total loss : 7.9 dB

    The other choice : just 1 ANC with 2 outputs, it gives you only 4.6dB loss.

    Delta loss is 3.3dB.

    The delta power between MP TRX and HP TRX is +1.3dB in GSM900 and +2.4dB in DCS1800.

    Therefore, in GSM900, by using a single output configuration with HP, compared to double output configuration with MP, you loose 2dB. In rural area, this is lead to an important loss of coverage.
    In urban area, the difference in coverage is hardly visible in outdoor, but can have a big impact for indoor subscribers.

    Regards,
    Pix

    #50333 Reply
    rala
    Guest

    Dear Pix,
    Thank you very much for your reply! I have to corrected my question that accually we would like to config to be more than 4 TRX in one sector(not 2 TRX) and we use the DCS1800.
    In normal way we used 4 MP TRX –>ANC –>double ant.(2 crosspolar antennas) And we would like to consider to use the 4 HP TRX –>ANy –>ANC –>1 crosspolar anttenna as we ask for the coverage effect.
    Regards,

    #50334 Reply
    Pix
    Guest

    1 ANC goes into 1 cross polar antenna, not two !!!

    4 TRX :
    4 TRX > 1 ANC > 2 outputs > 1 Xpol

    6 TRX :
    4 TRX > 1 ANy—
    )–> 1 ANC > 1 Xpol
    2 TRX———–

    8 TRX :
    4 TRX > 1 ANy—
    )–> 1 ANC > 1 Xpol
    4 TRX > 1 ANy—

    All other info to compute loss delta between the two config are provided in the previous post.
    Regards,
    Pix

    #50335 Reply
    rala
    Guest

    Dear Pix,
    Thank you to make it clear. : )
    Regards,

    #50336 Reply
    TNS
    Guest

    Hi, Pix.

    I didn’t understood what Rala wants to do…
    4 MP DCS TRXs + 4 HP DCS TRXs in the same sector to obtain 8 TRX capacity and minimum coverage losses?

    BR,
    TNS

    #50337 Reply
    pix
    Guest

    TNS,

    I have no idea 🙂 Sometimes it is harder to ask good question rather than to give good answers…

    The sure thing is that mixing HP TRX and MP TRX in one sector is stupid…

    #50338 Reply
    rala
    Guest

    Dear all,

    Sorry that my first question is not so clear.

    Accually I want to do the 5 MP TRX sector but I have only one crosspolar antenna.

    So I brought the ANY to use with ANC.(To aviod to add more antenna) Of cause the loss is more. Then I used the HP TRX intead of MP TRX.

    1. If we have 2 Antennas.
    ANTa –> ANCa(4 port) –> 4 MP TRX
    ANTb –> ANCb(1 port) –> 1 MP TRX

    2. If we have 1 Antenna.
    ANTa –> ANCa(2 port) –> 2 MP TRX
    ANTa –> ANCa(2 port) –> ANY –> 3 HP TRX

    But I’m not sure about the coverage result.
    That Pix kindly answered to me. : )

    #50339 Reply
    Pix
    Guest

    Rala,
    Ok, in this situation, your solution is good : the HP TRX will compensate for the loss of the ANY, so altogether :

    there is only a loss of 0.9dB between old configuration (only MP TRX + ANC) and the new config (MP + ANC and HP + ANY + ANC)

    not bad 🙂

    #50340 Reply
    TNS
    Guest

    Hi, all.

    In this case:
    “…
    2. If we have 1 Antenna.
    ANTa –> ANCa(2 port) –> 2 MP TRX
    ANTa –> ANCa(2 port) –> ANY –> 3 HP TRX
    …”,

    the SUMA should automaticaly equalize the output power to the module with lower power ( MP ).
    So to use mix MP+HP TRXs there is no sense…

    Isn’t it?

    BR,

    TNS

    #50341 Reply
    pix
    Guest

    hi,

    compensation is done thanks to BTS output values. it takes into account the power of the TRX – losses from combiners, connectors, etc..

    #50342 Reply
    TNS
    Guest

    Hi, Pix.
    I’m sorry but I didn’t get this…
    What is “BTS output value”?

    BR,
    TNS

    #50343 Reply
    pix
    Guest

    for example, in one cell (the values are approx !) :

    a HP TRE is connected to ANC = 48 – 4 = 44dBm at BTS antenna connector (= BTS output)
    a MP TRE is connected to ANY + ANC = 46 – 4 – 3 = 39dBm at BTS antenna connector

    The HP TRE will be decreased by 44 – 39 = 5dB, so the actual TX POWER of this TRE is 43dBm.

    The attenuation is not “48 – 46” = 2dB.

    #50344 Reply
    TNS
    Guest

    Hi, Pix.

    I got the point.
    Thank you.

    BR,
    TNS

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