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Dynamic Abis dimensionning [edge]

Viewing 15 posts - 31 through 45 (of 45 total)
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  • #44908 Reply

    Hii PIX
    thnks …..
    plz explain me Tandem Free operation and it takes place at where BTS,BSC ,TRAU

    #44909 Reply


    Have a look to the customer docs, it’s all in there, isn’t it ?

    #44910 Reply

    Hi Pix,

    I have a few question regarding the activation of Edge in Alcatel B9 network.

    1. what is the minimum required extra_ts on abis if I activate the Edge? At which MCS shall I start for this minimum extra_ts?

    2. at the BSC what are the parameters that I need to enable to activate the Edge?

    3. how do I define these extra_ts on the abis?

    #44911 Reply

    Hello Paolo,

    you don’t actually need extra ts : with your current basic nibbles and bonus nibbles in your BTS, chances are that you can obtain MCS-9 if :
    – only 1 user in the BTS is asking for packet services
    – there is not too much CS traffic

    Adding extra ts will allow more users at the same time with higher throughputs.

    To be on the safe side, define your MCS_INIT to MCS-6 at most.

    Also, consider your Ater PS interface (BSC-MFS) : one E1 contains only 112 GCH. And one user on the air interface with 4 PDCH MCS-9 is going to consume about 18 GCH’s all by himself.

    Therefore… extra TS are needed only if you want to deploy a commercial EGPRS network. For testing purposes (drive-tests, very limited numbers of users, or EGPRS enabled just during the night…), then you don’t have to add extra TS to enable EDGE. You won’t get great throughput all the time, but you will be in 8PSK.

    2 ———————-
    the parameters for EDGE activation are at cell level you need :
    MAX PDCH > 1
    EN EGPRS = enable
    And check that TRX are EDGE capable (TRAG, TRAGE, etc.)
    And that’s about it (i’ll need to check that’s all though. My memory is not perfect 🙂 )

    3 ———————–
    EXTRA TS are defined somewhere in the BSSUSM (BTS characteristics, etc…) I can check next week, but it’s really quite easy. Don’t you have your customer documentation around ??

    Let me know if you need more info, i’ll be in the office next week,


    #44912 Reply

    hi pix,

    thanks for the reply it was enlightening but I have a few more questions:

    1. where do I get to check that the trx are edge capable because we just migrated to B9 and we want to activate the edge for commercial use?

    2. is it automatic that if we migrate to B9 all trx will be edge capable or these will only be on sites with twin trxs? what’s the difference between twin and regular trx?

    3. like I said for commercial use what would be the safe number of extra_ts to be defined in order to ensure good throughput somebody told me to define at least 2 extra_ts? I know it depends on the traffic but initially I do have to define some extra_ts right? and these should be define on all the cells of edge capable trx?

    4. these extra_ts, are they dependent on the abis capacity of the network? what if we dont have enough capacity on the abis?

    5. lastly, what are the important KPIs that I need to check for EGPRS so I would know if the performance is good or not? what are the indicators that I must monitor to ensure that our Edge network is ok.

    I am new to this Edge/GPRS technology so I have a lot of questions and believe me once it gets operational I will have a bundle. Thank you so much!


    #44913 Reply
    Javed Shaikh

    Hi all of you,
    my question is very simple but i don’t know there answer so plz help me.

    Q.1 How can the system locate a user?

    Q.2 Why don’t all phones ring at the same time?

    Q.3 What happens if two users talk simultaneously?

    Q.4 How secure is the mobile phone system?
    Q.5 What are the key components of the mobile phone network?

    Please give me brief answer of those question.

    #44914 Reply

    hello paolo,

    i’m gald i could help.
    1- use the remote inventory (optionnal feature) to list all your hardwares in the network. The R.I. is accessible from the Icon Box, through a HTTP interface, as far as i remember.
    if you don’t have the R.I., then you’re in trouble : you need to check each TRX one by one in the BSSUSM.

    2- Twin TRX are EDGE capable, and so are the TRAG, TRAD, TRAGE and TRADE.
    the Twin TRX contains actually two TRE’s into a “single TRE” sized module. That’s the main difference. In terms of “behaviour”, it is like any other TRX (I think they are based on TRAGE and TRADE)

    3- obviously you need to perform a dimensioning for your network ! make assumptions on the expected packet traffic, the peak usages, the types of users, the GoS you want to provide, and so on. It is a very long and complex process, to be performed cell per cell on a radio planning tool.
    If you want a simple answer, then yes, you can put 2 extra TS per BTS. You can also put 3, or 4, or 1. Or none. Or 15. It really depends on your traffic.

    4- if you don’t have enough capacity on your abis, you add a secondary abis.

    5- check the TBF establishment and drop rate (UL and DL). Check the Ater congestion (at GPU level). Check the average number of PDCH per cell. Check also the GPRS Distribution indicators (= GPRS RMS)

    Paolo, you should contact Alc-Luc : they can put one expert on your network that can assist you on this project. If you don’t want that, then you could purchase a 3 or 4 weeks training course.. And the least you could do is to read the customer documentation : twin trx, secondary abis, extra timeslots : all this is described !
    I’m afraid it’s a bit dangerous to improvise yourself as a EGPRS dimensioner and planner. You need some basic knowledge and documentations.

    Do you have A9155 RNP tool ?


    #44915 Reply


    I guess this is an exercise from school ? you could find all the answers on internet.

    Q1- the system can located the user thanks to the Location Update procedure. The system knows the “Location Area” of each user.

    Q2- phones don’t ring all at the same time because when someone calls someone else, then only the “called” phone is going to ring. Not all the phones in the netwok. The called phone knows that it is being called thanks to the Paging Request message (on the BCCH), that contains its own and unique TMSI. The Paging message is sent from all the cells in the current Location Area.
    Only the called phone will answer to this specfic paging.

    Q3- when two users talk simult. then nothing special happens : both users can hear and talk at the same time (one timeslot per direction and per user)

    Q4 – as secure as the A5/1 algorithm is. Which means : not much. (you can find “A5/1” in wikipedia.

    Q5- key components ? you mean… the main elements ? like MSC, BSC, and so on ? you can find this in wikipedia, by searching “GSM”. You’ll have all elements, and their functions.

    I hope it was brief enough 🙂


    #44916 Reply

    hi pix,

    thanks for the reply it helps a lot. No, we don’t have the A9155 Planning tool we only have the A9156 RNO tool. Anyway, I need to check on the documentations available so I could read more info on this. Again, thank you so much.


    #44917 Reply

    Hi Pix,

    U have mentioned in your Nov 2, 2007 reply that 2- Twin TRX are EDGE capable, and so are the TRAG, TRAD, TRAGE and TRADE – Can u please confirm me that TRAG and TRAD are edge capable ?

    #44918 Reply

    trag and trad are EDGE capable.
    the only drawback is the very low TX power they provide.
    (column 1&2 : GMSK power, col.3&4 : 8PSK power)
    TRAG 45W 46,5 15W 41,8
    TRAGE 45W 46,5 30W 44,8
    TAGH 60W 47,7 25W 44,0 (old high power trx)
    TAGHE 60W 47,8 30W 44,8 (new high power trx)

    #44919 Reply
    Javed Shaikh

    Hi all of you,
    Please explain me whole procedure of Spectrum in GSM. how to work in GSM system

    #44920 Reply

    Hi Pix,

    So all these TRXs are edge capable but only with reduced TX power (less coverage area) – which means that the can use all the CS and MCS – right ?

    #44921 Reply


    now you’re putting some doubts in my mind :))

    i’ll check that out and come back to you later.


    #44922 Reply

    Hi, Fahim.

    “EDGE capable TRX” means that this TRX has a functional unit which is 8-PSK modulator/demodulator.

    Because of the constant symbol rate in the radio path the difference between the MCSs is a different proportion between the useful data and the noise protection bits.
    It’s more software than hardware.

    In fact the high MCS depends on max MCS allowed ( parameter ), radio conditions ( C/I ) and Abis resources ( additional TSs )…
    So it’s logical that the TRAGE could give you better C/I when transmitting DL TBF than the TRAG could.
    But it’s wrong to say that this will give you a higher MCS automaticly.

    In brief:
    The abreviation means the max power of the hardware unit for the different modulations.
    Yes, you can use all CS and MCS ( if it’s possible – permission, C/I, Abis ).



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