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- 04-20-2006, 04:12 AM #1Raqueeb HassanGuest
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?
- 04-20-2006, 10:12 AM #2John NavasGuest
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>
- 04-20-2006, 11:21 AM #3MeGuest
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.
- 04-20-2006, 12:17 PM #4John NavasGuest
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>
- 04-20-2006, 02:43 PM #5John HendersonGuest
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
- 04-20-2006, 03:14 PM #6John NavasGuest
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>
- 04-20-2006, 03:43 PM #7matt weberGuest
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.
- 04-20-2006, 09:47 PM #8John HendersonGuest
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
- 04-25-2006, 05:57 AM #9SaurabhGuest
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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