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  1. Replies
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    Re: Help for calculate antenna gain in 3D

    Hi!
    Your question might be misunderstood.

    In general, if you have 3D model of antenna radiation, you can calculate directivity by deviding signal strength in main lobe
    with "average" signal...
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    Re: 3G network with MIMO & DC_HSPA applied

    Hello!

    Real MIMO in 3 G is dead: problem with legacy terminals.
    So, 3G MIMO slowly faded out of powerpoints and roadmaps of most vendors.
    While refarming 2.1 GHz for LTE, it becomes attractive:...
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    Re: Coverage comparing between 2G vs. 3G vs. 4G

    I guess original question was "how to compare".
    Is RSRP -110 dBm better as RSCP -100 dBm?
    How they compare to GSM -95 dBm?


    IMHO, there is no simple answer: it depends on network parameters...
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    Extended Cyclic Prefix in LTE

    Hello!

    When investigating some 800 MHz LTE cell, a possibility of mulipath causing ISI come to my mind.
    It is bareliy mentioned in the SW description.

    few questions:
    1, is extended CP (15 kHz...
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    Question Re: SDCCH Handover in LAC border

    Hi!

    years ago I've been hunting why SDCCH handover stats were bad on LA border (inter-BSC, inter-MSC handover as well, it was before R4 architecture). I found out E/// does not start handover for...
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    Question Re: question about "inter-RAT cell reselection"

    Without looking into papers/traces etc: When terminals do RA update, they report previous RA. I guess TA as well.
    If not: I guess HLR/HSS/SGSN/MME traces should tell teh story.

    BR, HNY
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    Re: GSM-GPRS-EDGE ebooks collection

    Thanks!
    Especially for google no-registration-needed link.

    While talking GSM: I used to buy few copies of "The GSM book" 15 to 20 years ago. They all dissapeared ;-).

    I would love to have...
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    Original Re: Planning tools for UHF-VHF frequency band.

    IMHO best open tool. Open source, you can modify.

    It is build on top of GRASS GIS package, so they can focus on radio propagation, while all the GIS goodies are already done.
    ...
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    Re: Searching RRC decoder

    wireshark.

    Regulary updated, sources available: what else we need?

    http://lionet.info/asn1c/download.html is faster, but not as simple to maintain/upgrade/tune.


    BR
    s52d
  10. Thread: 2G-3G Reselection

    by s52d
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    Re: 2G-3G Reselection

    Hi!
    without looking in docs:
    In general, terminal in idle mode (and active, where enabled) receives proper information and scans for UMTS cells.
    to move, there are several different algorithms,...
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    Re: Call divert from 3G to 2G

    IMHO: Sorry, no.
    User can do voice + data, and MSCS is not aware of data, so forced handover to GSM might be problematic.

    Also, MSCS is not involved in early phases of call establishment, so it...
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    Re: BTS/MS power control

    Mobile Measurement Report recording (MRR in E///).

    A histogram can be made where distribution of GSM Q (UL/DL), TA (timing advance), SS (signal strength) with/withoit power control
    can be seen.
    ...
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    Re: BTS/MS power control

    IMHO, there is no best settings.

    Each cell is specific.
    You have to consider:
    - are frequencies heavy loaded: then be aggressive to minimize interference
    - are users close to the antenna or...
  14. Thread: IMEI list, update

    by s52d
    Replies
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    1,934

    IMEI list, update

    A year ago I posted TAC - terminal list, thread is closed.

    Here is updated list: a bit edited, as needed locally.

    BR

    s52d
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    Re: Abis Optimization Questions

    Hi!

    Cicuit switched system, like old telephone:
    - You need three pairs of wires to handle three telephones

    Packet switched system, like ethernet:
    - three PCs share same line, they just use...
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    Re: Abis Optimization Questions

    Hello!

    Classic ABis uses PDH over E1: each 64 kbit/s Abis TS is assigned to specific TRX/TG and it can be routed separately, and it is treated separately. A lot of functionality tries to make...
  17. Thread: LTE on 900 MHz

    by s52d
    Replies
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    2,319

    Re: LTE on 900 MHz

    Hi!

    Thanks: yes, we did limited testing with legacy GSM repeaters on 900 and 1800 MHz.
    So far, all tests were OK. Even cheap repeaters perform reasoneble well.

    We even got nice results with...
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    Question Re: Actual Scenario in UMTS

    1 and 2:
    Yes. As several cells use same bandwidth, interference can be observed much further as service are of the cell.
    Even CPICH is interfereing other cells. Basics of CDMA.
    More power, more...
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    Question Re: Actual Scenario in UMTS

    Hi!

    It all depends on spreading factor.
    In order to detect signal, it is not just signal strength, it is C/I after despreading and filtering that matters.

    So, in short: while HSPA usable...
  20. Thread: 2G/3G Co-LAC

    by s52d
    Replies
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    6,378

    Question Re: 2G/3G Co-LAC

    IMHO: first networks in my area were using common LA for 2g/3g with NSN core.
    Please note: this is pure core network functionality: both BSC and RNC do not need to know about common LA.

    Years...
  21. Re: What is best Frequency plan with 20 frequencies.

    it works for 2+2+2 cells. Use MAIO 0,2,4 so no two TRXes receive in the same time on same or adjacent frequencies.
    You have hopping gain: remeber, 20 ms is spread over 8 TS, so from pure hoppong...
  22. Thread: LTE on 900 MHz

    by s52d
    Replies
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    2,319

    LTE on 900 MHz

    Few networks are actually using LTE 900 in commercial service.

    We tried it on top of LTE 1800: it works as expected. It increases indoor coverage, suitable for VoLTE.
    In collocated cells most of...
  23. Re: What is best Frequency plan with 20 frequencies.

    Hello!
    It depends on antenna planning. If you did well (optimized for UMTS/LTE) then you can do with 11 or 12 BCCHs. Assign border BCCH to cells with low load amd use 8/7 TCH frequencies, other...
  24. Re: E******* GSM Consistency Check report to planned area

    Hello!

    I would do it wtth cna_export /cna_import and editing text file.
    If you print cna report to file (cna configuration), you can extract all problems and generate MML script.

    Without some...
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    Original Re: interference in U900

    Intermodulation happens if there is some nonlinearity (it allways is...).
    If TX signals are changed depending on their amplitude (distorsion), you can get all possible combination of frequencies....
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