Uplink/Downlink Frequencies in GSM/CDMA

This topic has 62 replies, 1 voice, and was last updated 7 years, 2 months ago by asif.

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15th September 2004 at 04:52 #37000

Srinivas Harnoor
Guest

Higuys,
thanks for the cdma and gsm frequencies.
thanks a lot.

Srinivas harnoor.

15th September 2004 at 07:01 #37001

arvinder singh
Guest

hi
how the interference between uplink &downlink signal is avoided (specialy in CDMAwhere both have same frequency & same pn code)

18th April 2006 at 08:45 #37002

Shriram
Guest

Why Uplink Frequency is less than Downliny Frequency.
GSM 900:
Uplink : 890-915 Mhz
Downlink: 935-960 Mhz
GSM 1800:
Uplink : 1710-1785 Mhz
Downlink: 1805-1880 Mhz
Why cant we use uplink band as 935-960 and downlink as 990-915Mhz

18th April 2006 at 09:42 #37003

Vanderlay
Guest

Less transmitting power for lower frequency (MS)

18th April 2006 at 17:10 #37004

RAMI
Guest

Dear Shriram,
As you know in GSM the UL is limited since the MS tx-power (UL) is small as compared to the BTS tx-power (DL) and because the attenuation increases as the frequency increases, for the above mentioned reasons the UL is assigned to the lower frequency band while the DL for the higher one.

20th April 2006 at 09:05 #37005

Shriram
Guest

Hi Rami

thanks for the clarification.
thanks a lot.

Regards
Shriram

7th November 2006 at 10:10 #37006

mirza
Guest

hi Karthik,
today i first time saw that question thats why i m giving u answer.
as u said each frequency in gsm is further divided into 8 time slots and u get this. 1/200KHZ=5 microseconds.so my sweet buddy.200KHZ is the bandwidth of the channel if it is devided it will give u the bandwidth of the slots not “time”.so ur question is wrong.if u want more u can write ur question.
bye
mirza

7th November 2006 at 11:52 #37007

Suresh
Guest

hi mirza,

ur reply is wrong

7th November 2006 at 21:48 #37008

pix
Guest

hi mirza,
the guy wrote the question in 2004… i’m not sure he’s still looking for the answer. But, yeah, his question was based on wrong thinking.

Regarding your answer, if you divide the bandwidth of 200kHz, it won’t give you the bandwidth of a slot. The slot is a “TIME” slot, so it is the full 200 kHz that are cut every 4.16ms.. mmm. i’m not using the right words here… nvmind 🙂

8th November 2006 at 05:31 #37009

mirza
Guest

Dear pix,
u r wright.actually i want to clear that person if u divde then u will get bandwidth so called.but u can never get microsecond.i want to clear him.i know its just sharing of time.not divde the bandwidth.even then i m thankful to answer this
keep in contact.
take care
bye

8th November 2006 at 05:34 #37010

mirza
Guest

hi Suresh,
if u think i m wrong.then u tell me the right answer,i m waiting for ur reply.i think u didnt read MR PIX answer.
take care
bye

8th November 2006 at 15:42 #37011

Pix
Guest

mirza,

yes, it is always good to discuss about this anyway.

regards

11th December 2006 at 16:29 #37012

Ravikumar
Guest

Hi chachu
For GSM1800 Band
uplink freq: 1710-1785 Mhz
Downlink freq:1805-1880Mhz.

18th December 2006 at 05:30 #37013

iwan
Guest

Hi Friends

Can u help this ??
The site GSM 1800 has low SDSUC reasons Low Signal strength Uplink and TDR same reasons Low Signal strength Uplink :

MSTXPWR : 30
BSPWRB : 45
BSPWRT : 45
Layer Treshold : -85
ACCMIN : -90

19th December 2006 at 12:41 #37014

paresh patel
Guest

hi chachu

There are two type of Band in Any Mobi1e company likeGSM 900 or GSM
1800 and both have the difference Frequency

in GSM 900
Uplink Freq -890 to 915 MHZ
Downlink Freq- 935 to 960 MHZ

and in GSM 1800
Uplink Freq -1710 to 1785MHz
Downlink Freq- 1805 to 1880MHZ

i hope u ‘ll get yr Answer.

Regards,
Paresh Patel.
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