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Uplink/Downlink Frequencies in GSM/CDMA

Viewing 15 posts - 31 through 45 (of 63 total)
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  • #37000 Reply
    Srinivas Harnoor
    Guest

    Higuys,
    thanks for the cdma and gsm frequencies.
    thanks a lot.

    Srinivas harnoor.

    #37001 Reply
    arvinder singh
    Guest

    hi
    how the interference between uplink &downlink signal is avoided (specialy in CDMAwhere both have same frequency & same pn code)

    #37002 Reply
    Shriram
    Guest

    Why Uplink Frequency is less than Downliny Frequency.
    GSM 900:
    Uplink : 890-915 Mhz
    Downlink: 935-960 Mhz
    GSM 1800:
    Uplink : 1710-1785 Mhz
    Downlink: 1805-1880 Mhz
    Why cant we use uplink band as 935-960 and downlink as 990-915Mhz

    #37003 Reply
    Vanderlay
    Guest

    Less transmitting power for lower frequency (MS)

    #37004 Reply
    RAMI
    Guest

    Dear Shriram,
    As you know in GSM the UL is limited since the MS tx-power (UL) is small as compared to the BTS tx-power (DL) and because the attenuation increases as the frequency increases, for the above mentioned reasons the UL is assigned to the lower frequency band while the DL for the higher one.

    #37005 Reply
    Shriram
    Guest

    Hi Rami

    thanks for the clarification.
    thanks a lot.

    Regards
    Shriram

    #37006 Reply
    mirza
    Guest

    hi Karthik,
    today i first time saw that question thats why i m giving u answer.
    as u said each frequency in gsm is further divided into 8 time slots and u get this. 1/200KHZ=5 microseconds.so my sweet buddy.200KHZ is the bandwidth of the channel if it is devided it will give u the bandwidth of the slots not “time”.so ur question is wrong.if u want more u can write ur question.
    bye
    mirza

    #37007 Reply
    Suresh
    Guest

    hi mirza,

    ur reply is wrong

    #37008 Reply
    pix
    Guest

    hi mirza,
    the guy wrote the question in 2004… i’m not sure he’s still looking for the answer. But, yeah, his question was based on wrong thinking.

    Regarding your answer, if you divide the bandwidth of 200kHz, it won’t give you the bandwidth of a slot. The slot is a “TIME” slot, so it is the full 200 kHz that are cut every 4.16ms.. mmm. i’m not using the right words here… nvmind 🙂

    #37009 Reply
    mirza
    Guest

    Dear pix,
    u r wright.actually i want to clear that person if u divde then u will get bandwidth so called.but u can never get microsecond.i want to clear him.i know its just sharing of time.not divde the bandwidth.even then i m thankful to answer this
    keep in contact.
    take care
    bye

    #37010 Reply
    mirza
    Guest

    hi Suresh,
    if u think i m wrong.then u tell me the right answer,i m waiting for ur reply.i think u didnt read MR PIX answer.
    take care
    bye

    #37011 Reply
    Pix
    Guest

    mirza,

    yes, it is always good to discuss about this anyway.

    regards

    #37012 Reply
    Ravikumar
    Guest

    Hi chachu
    For GSM1800 Band
    uplink freq: 1710-1785 Mhz
    Downlink freq:1805-1880Mhz.

    #37013 Reply
    iwan
    Guest

    Hi Friends

    Can u help this ??
    The site GSM 1800 has low SDSUC reasons Low Signal strength Uplink and TDR same reasons Low Signal strength Uplink :

    MSTXPWR : 30
    BSPWRB : 45
    BSPWRT : 45
    Layer Treshold : -85
    ACCMIN : -90

    #37014 Reply
    paresh patel
    Guest

    hi chachu

    There are two type of Band in Any Mobi1e company likeGSM 900 or GSM
    1800 and both have the difference Frequency

    in GSM 900
    Uplink Freq -890 to 915 MHZ
    Downlink Freq- 935 to 960 MHZ

    and in GSM 1800
    Uplink Freq -1710 to 1785MHz
    Downlink Freq- 1805 to 1880MHZ

    i hope u ‘ll get yr Answer.

    Regards,
    Paresh Patel.

Viewing 15 posts - 31 through 45 (of 63 total)
Reply To: Uplink/Downlink Frequencies in GSM/CDMA
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