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BTS

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Viewing 15 posts - 361 through 375 (of 469 total)
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  • #39545 Reply
    Bradlington
    Guest

    Motorola 2G question:

    We in the GSM engineering GSM field are required to calibrate the gclk’s annually.
    I am under the impression that this is a waste of time as far as I understand how GCLK’s work , the longer one leaves them the more stable they should become.
    I would like to hear from anyone who knows these GCLK’s very well and have any statistical data to back the comments.

    We have stable E1 links and phase lock to the incomming E1 on the primary link port.
    Regards
    Brad

    #39546 Reply
    Iftikhar Ahmad
    Guest

    Dear Gouse,
    Please ask me your questions in details about CDMA or GSM then I will answer you. But if you want total details of CDMA then I will recommend you the website of qalqam.

    #39547 Reply
    Michala Mackay
    Guest

    location of bts sites – any international regulation prescribing the minimum distance to exist between bts sites of different operators?

    disadvantages of building a site less then 100m from an already installed bts site.

    grateful for any assistance.
    Best Regards

    #39548 Reply
    Mann
    Guest

    Hi all, m working as FLM engg with nokia BTS. recently I have faced a problem where calls cannot be completed. everytime we dial a no, we get “call disconnected” without any reason.
    The BTS is not having abnormal VSWR. Can nyont tell the reason?

    #39549 Reply
    Pix
    Guest

    hello mann,

    it might be a sector inversion, or a hardware failure from a TRE or ANC (combiner), or a hardware failure from the transcoder,

    You ought to perform some detailed Abis traces :
    when does the call stops ? (AGCH, SDCCH, TCH phases ?)
    on which TRE are you on ?
    does it drop on all TRE ?
    does it drop on the other sectors too ?
    are the other BTS on the same Abis link impacted too ?
    on the whole transcoder ?
    on all the BTS of the same transcoder’s TCU ?

    I hope it can help… those are just possibilities. Try also to go in the cell with an handover, instead of a call setup. And check out your QoS indicators, what are they telling you ?

    #39550 Reply
    Mann
    Guest

    Thnx pix,
    I’ll try wid wat u have suggested. I had already checked on which TRXs and sectors the pro is. And its not trx or sector specific. Calls are getting disconnected in every sector.
    But, its happening only in one particular BTS of the transcoder. Even i suspect a faulty combiner and replacing it 2day. lets hope the prob sees off.

    #39551 Reply
    anant aggarwal
    Guest

    Hi,
    I want to know about different of anteena and their gain used in GSM? and the manufacturing detail of anteena?

    #39552 Reply
    yellaiah
    Guest

    hai , can any help on Diversity principle used in GSM.

    with regards

    #39553 Reply
    oscar
    Guest

    hi
    I am new in this area, for this a need information about BTS Ericcson.

    thanks

    Oscar

    #39554 Reply
    rafi
    Guest

    Hi Oscar,
    BTS(Base transceiver System)is a set of equipment to handle a cell in GSM. BTS consists of transmitters, receivers, CDUs,power supplies and antennae. Each GSM site may be configured in two or three sectors and each sector is provided with four hannels.For GSM, RBS200 series and 2000 series were used. Now 2206 is extensively used. For WCDMA RBS300 series is introduced.

    #39555 Reply
    Rafi
    Guest

    Hi Gouse,
    GSM is an old version of mobile communication where TDMA is utilised while CDMA is new one where codes are allotted to each mobile user.3G is WCDMA(Wideband code division multiple access, BW=5MHZ)is a further development of CDMA(BW=1.25MHZ)having a number of applications.Capacity of CDMA is much more comparing to GSM and it is flexible.If a channel accomodates 80 users in CDMA, it can accomodate further more at the cost of quality and coverage.As number of users increase noise
    increases and coverage reduces due to a phenomena called cell breathing.Unlike GSM where frequency planning is required using a number of frequencies, code planning is required in CDMA using same frequency in adjacent cells without any interference.

    #39556 Reply
    Arn
    Guest

    helo,

    I am electrnic and communication engr, i want to enhanced more my knowledge regarding GSM networks, like MIcrowave installation, BTS intallation, Integration and others. Anyone can help me and send me data to be read…

    thanks to all

    hoping for your respond

    #39557 Reply
    rafi
    Guest

    Hi yellaiah,
    In Wireless communications, two types of diversities are used.
    1 . Frequency Diversity: Here signal is transmitted on two different frequencies and signals from both carriers combined at receiver end to recover it. Space attenuation is different for different frequencies. If one frequency is attenuated, the other one is strong enough to be used at receiver end and addition of two produces good signal.
    2 . Space Diversity: Due to changes in the environment, signal is bent in the vertical direction. On receiver side two antennae are installed on tower with a space between them receiving same frequency and their signals are combined together for good quality.

    #39558 Reply
    123
    Guest

    any one knows how to measure signal strength using mobile? and what mobile can be use to measure the signal strength in decibels

    #39559 Reply
    yellaiah
    Guest

    hai rafi,

    thanks for ur suggestion regarding Diversity..

Viewing 15 posts - 361 through 375 (of 469 total)
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