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  1. #1
    Raqueeb Hassan
    Guest
    Hello! As I was reading one of the 'Ericsson Review' issues on GSM/EDGE

    service evolution, It said "Multicarrier EDGE yields increased
    bandwidth. This is manifested by increased peak and meanbit rates both
    over the uplink and downlink."

    Now, for a given time slots of maximum 8 for EDGE transmission in each
    direction (uplink and downlink), as GSM standard allows it, the
    transfer rate can be upto 480 kpbs. Now for increasing the bandwidth,
    we can employ multiple carriers, as I understood. Lets say, with four
    carriers and 8 timeslots each, the highest transfer rate would be like
    2Mbps.


    Now, what might be the complexity for the operator to install multiple
    BTSs, (Base Transceiver Station) in same area for providing more time
    slots than that of 8? Does that mean we also have to upgrade our
    terminals/cell phone/EDGE devices that can recieve from more than 1
    BTS? Will our terminals/phones need to have mulitiple transceivers?


    TIA.


    Raqueeb Hassan
    Bangladesh




    See More: Does Multicarrier GSM/EDGE need different terminals?




  2. #2
    John Navas
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    [POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]

    In <[email protected]> on 20 Apr 2006
    03:12:52 -0700, "Raqueeb Hassan" <[email protected]> wrote:

    >Hello! As I was reading one of the 'Ericsson Review' issues on GSM/EDGE
    >
    >service evolution, It said "Multicarrier EDGE yields increased
    >bandwidth. This is manifested by increased peak and meanbit rates both
    >over the uplink and downlink."
    >
    >Now, for a given time slots of maximum 8 for EDGE transmission in each
    >direction (uplink and downlink), as GSM standard allows it ...


    AFAIK, neither carriers nor devices are currently supporting the use of all 8
    time slots. Class 12 supports a maximum of 5 total slots, with a maximum of 4
    in either direction.

    --
    Best regards, SEE THE FAQ FOR CINGULAR WIRELESS AT
    John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>



  3. #3
    Me
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    "John Navas" <[email protected]> wrote in message
    news:[email protected]...
    > [POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]
    >
    > In <[email protected]> on 20 Apr 2006
    > 03:12:52 -0700, "Raqueeb Hassan" <[email protected]> wrote:
    >
    >>Hello! As I was reading one of the 'Ericsson Review' issues on GSM/EDGE
    >>
    >>service evolution, It said "Multicarrier EDGE yields increased
    >>bandwidth. This is manifested by increased peak and meanbit rates both
    >>over the uplink and downlink."
    >>
    >>Now, for a given time slots of maximum 8 for EDGE transmission in each
    >>direction (uplink and downlink), as GSM standard allows it ...

    >
    > AFAIK, neither carriers nor devices are currently supporting the use of
    > all 8
    > time slots. Class 12 supports a maximum of 5 total slots, with a maximum
    > of 4
    > in either direction.
    >
    > --
    > Best regards, SEE THE FAQ FOR CINGULAR WIRELESS AT
    > John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>


    Very true, or quite true, but an odd quote. The GSM standard DOES support 8
    slots, although this has not been commercially attractive. I guess you
    should have quoted this sentence:
    > Lets say, with four
    > carriers and 8 timeslots each, the highest transfer rate would be like
    > 2Mbps.

    One should not expect 2 Mbps but more than 8 timeslots would be commercially
    feasible.





  4. #4
    John Navas
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    [POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]

    In <[email protected]> on Thu, 20 Apr 2006 17:21:36 GMT,
    "Me" <[email protected]> wrote:

    >"John Navas" <[email protected]> wrote in message
    >news:[email protected]...


    >> AFAIK, neither carriers nor devices are currently supporting the use of
    >> all 8
    >> time slots. Class 12 supports a maximum of 5 total slots, with a maximum
    >> of 4
    >> in either direction.


    >Very true, or quite true, but an odd quote. The GSM standard DOES support 8
    >slots, although this has not been commercially attractive. I guess you
    >should have quoted this sentence:
    >> Lets say, with four
    >> carriers and 8 timeslots each, the highest transfer rate would be like
    >> 2Mbps.

    >One should not expect 2 Mbps but more than 8 timeslots would be commercially
    >feasible.


    If it were commercially feasible, then someone would probably be doing it.
    Likewise "just" for 8 time slots. Network capacity is the most obvious issue.

    --
    Best regards, SEE THE FAQ FOR CINGULAR WIRELESS AT
    John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>



  5. #5
    John Henderson
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    John Navas wrote:

    > If it were commercially feasible, then someone would probably
    > be doing it.
    > Likewise "just" for 8 time slots. Network capacity is the
    > most obvious issue.


    IIRC, the it's potential radiation hazard (real or not) which
    keeps the timeslot count down.

    John



  6. #6
    John Navas
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    [POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]

    In <[email protected]> on Fri, 21 Apr 2006 06:43:45 +1000, John
    Henderson <[email protected]> wrote:

    >John Navas wrote:
    >
    >> If it were commercially feasible, then someone would probably
    >> be doing it.
    >> Likewise "just" for 8 time slots. Network capacity is the
    >> most obvious issue.

    >
    >IIRC, the it's potential radiation hazard (real or not) which
    >keeps the timeslot count down.


    I'm very skeptical. Cite?

    --
    Best regards, SEE THE FAQ FOR CINGULAR WIRELESS AT
    John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>



  7. #7
    matt weber
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    As a practical matter, I doubt you will ever be able to use more than
    7 slots in any direction. Transmitter and receiver must be offset in
    time, so that both are never on at the same time. The duplexer
    hardware prevents damage to the receiver from the transmitter, but the
    transmit power will still obliterate reception.

    On Thu, 20 Apr 2006 16:12:49 GMT, John Navas
    <[email protected]> wrote:

    >[POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]
    >
    >In <[email protected]> on 20 Apr 2006
    >03:12:52 -0700, "Raqueeb Hassan" <[email protected]> wrote:
    >
    >>Hello! As I was reading one of the 'Ericsson Review' issues on GSM/EDGE
    >>
    >>service evolution, It said "Multicarrier EDGE yields increased
    >>bandwidth. This is manifested by increased peak and meanbit rates both
    >>over the uplink and downlink."
    >>
    >>Now, for a given time slots of maximum 8 for EDGE transmission in each
    >>direction (uplink and downlink), as GSM standard allows it ...

    >
    >AFAIK, neither carriers nor devices are currently supporting the use of all 8
    >time slots. Class 12 supports a maximum of 5 total slots, with a maximum of 4
    >in either direction.





  8. #8
    John Henderson
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    John Navas wrote:

    > [POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]
    >
    > In <[email protected]> on Fri, 21 Apr 2006
    > 06:43:45 +1000, John Henderson <[email protected]>
    > wrote:
    >>IIRC, the it's potential radiation hazard (real or not) which
    >>keeps the timeslot count down.

    >
    > I'm very skeptical. Cite?


    It's been quite a while since I came across that claim, and I
    haven't been able to find it again. The claim does get a brief
    and dismissive mention at http://tinyurl.com/kvg9m

    I did however find a good account of some design issues for
    multislot devices at http://tinyurl.com/kttkw (a lengthly PDF
    file).

    John




  9. #9
    Saurabh
    Guest

    Re: Does Multicarrier GSM/EDGE need different terminals?

    Hi,

    I hope the following will be useful to understand EDGE in details.

    EDGE (Enhanced Data Rate for GSM Evolution)
    EDGE allows GSM operator s to use existing GSM radio bands to offer
    wireless multimedia IP-Based services and application at theoretical
    maximum speeds of 384 kbps. (bit rate of 48 kbps per timeslot, 59.2
    kbps per timeslot possible in good radio conditions).The trick in EDGE
    is to use 8PSK modulation with linearized Gaussian Filtering, where 3
    bits represent one of 8 phase angles, which will increase the bit rate
    of GSM /GPRS by 3 times.
    To implement EDGE only one EDGE transceiver unit will need to be added
    to each cell. Existing GSM terminals do not support the new modulation
    techniques and will need to be up graded to use EDGE network
    functionality. By applying Erlang Law to EDGE, it make 6 times faster.
    There are 9 types of EDGE modulations and two types of EDGE (Compact
    and Classic).

    Aloha,
    Saurabh




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