1xRTT vs EVDO

[rohan208]

Hello,
I would like to know whats the difference between the two technologies (1xRTT vs EV-DO) in terms of their predecessors.. (or are there any?). Also thier speed etc. IS there a good link to follow? What other types of cellular systems are available in current north-american market?

sincerely,
Rohan

[kristof.vanriet]

1xRTT or single carrier (1x) radio transmission technology, 1xRTT is also referred to as CDMA2000 1x, is a 3G technologie based upon CDMA with speed upto 144 Kbs (like ISDN)

cdma2000 1xEV, the next step, will allow for up to 2.4 Mbps data transfer rates (1xEV-DO, data only) and 4.8 Mbps in phase 2 (1xEV-DV, data and voice).

[kristof.vanriet]

If you compare with GSM technologies, you've got
GPRS: up to 180 kbs
EDGE: up to 235 kbs
WCDMA: up to 10.8 Mbps
HSDPA: up to 25 Mbps

[rohan208]

Thanks for the info kristof.vanriet. I'll look more into these before bargin with lots more questions :)

Rohan

[justop26]

kristof.vanriet,

Is GPRS technology really 180kbs?:eek: I always thought it's maximum was 40.3 kbs, as Nokia always mention in their phones specifications....

Clear this up for me please! I thought I knew, and now I doubt.

[sunystory@hotmail.com]

wcdma release c is 10.8Mbps (not yet commercialized), as long as i know. In general, wcdma is slower than ev-do's. HSDPA can be used in cdma also, if i am not wrong. MC-CDMA and MC-DS CDMA is another type of cdma, which promises 100Mbps speed. This is beyond 3G, and this will be adapted in Korea by 2005(nationwide broadband is being constructed). Within the MC-CDMA network, there will be segments with OFDM which gives 10Mbps~400Mbps.(serviced only in metropolitan cities) I think this is notable because right now most of the 3G users in the world are cdma users(90% of 3G users uses cdma 1x 2000 serivce). By 2005, wcdma will exceed cdma 1x 2000 users (2.75 or 3G) by 2006, it is prospected that wcdma will eventually pass cdma market in 3G (wcdma release c will promise better data transfer rate than any cdma 3G service) But by the time, cdma market will enter to 4G. As usual, I believe that gsm market needs to work more on network communications. yes, it costs much. But it desesrves:)

[kristof.vanriet]

It depends, the theoretical best speed is 171.2 kbit/sec, so in real live, speed is much less... about 40 to 50 Kbs
and then you depend on how much slots are used, in the best case all 8 slots are used as downlink... in practice, you have mostly only 2 up and 4 down, depends on what class the phone use...