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Cellular Phone Forum / General / GSM / August 2007Telstra 850MHz WCDMA can't match its 2100MHz cdma??
http://www.theregister.co.uk/2007/08/06/2g_switch_off/ This puts in question Telstra's claim that WCDMA could extend to 80km... http://cellphoneforums.net/aus-comms-mobile/t217008-3g-range.html > http://www.theregister.co.uk/2007/08/06/2g_switch_off/ > > This puts in question Telstra's claim that WCDMA could extend > to 80km... http://cellphoneforums.net/aus-comms-mobile/t217008-3g-range.html Given 3GSM (WCDMA) and ordinary CDMA cells at the same location, one likely cause of poorer long-distance 3GSM performance is competition with high-bandwidth 3GSM users who are much closer to the BTS (and therefore "louder"). Unlike 2GSM, where freedom from such interference is guaranteed by the use of time-division instead of code-division, other 3GSM user sessions can manifest as performance-degrading noise. John > carc...@hotmail.com wrote: > >http://www.theregister.co.uk/2007/08/06/2g_switch_off/ [quoted text clipped - 8 lines] > competition with high-bandwidth 3GSM users who are much closer > to the BTS (and therefore "louder"). W-CDMA shares the characteristic of cdma that power control is mandatory, so there should be little difference between W-CDMA and cdma in that regard. Secondly, since they are both code division multiple access the correlators will render other "talkers" in the sector the same as noise. These two attributes are basic characteristics of any code division multiple access system. >> Given 3GSM (WCDMA) and ordinary CDMA cells at the same >> location, one likely cause of poorer long-distance 3GSM >> performance is competition with high-bandwidth 3GSM users who >> are much closer to the BTS (and therefore "louder"). > W-CDMA shares the characteristic of cdma that power control > is mandatory, so there should be little difference between [quoted text clipped - 4 lines] > These two attributes are basic characteristics of any code > division multiple access system. Yes. Perhaps I didn't emphasise enough the importance of the competition from many and much closer "high-bandwidth 3GSM users". After all, the BTSs are usually located close to population centres. Telstra is pushing the 3GSM high-bandwidth services, which are not generally available on the older CDMA network: http://my.bigpond.com/mobile/default.jsp They can't have it both ways. Heavy use of 3GSM services directly translates to shorter range, and the need for more BTSs. John > Yes. Perhaps I didn't emphasise enough the importance of the > competition from many and much closer "high-bandwidth 3GSM > users". After all, the BTSs are usually located close to > population centres. So, you don't mean "louder", but lower latency. > Telstra is pushing the 3GSM high-bandwidth services, which are > not generally available on the older CDMA network:http://my.bigpond.com/mobile/default.jsp > > They can't have it both ways. Heavy use of 3GSM services > directly translates to shorter range, and the need for more > BTSs. But if the cdma network is really at 2100 MHz and the WCDMA network is at 850 MHz the usable cell radius of a crowded "tower" at 850 MHz should dramatically overextend the 2100 MHz cell radius! If, however, the 850 MHz cell is constantly oversubscribed, then, regardless of the technology, more cells will be needed. At least with xcdma more frequencies (as with TDMA) won't need to be allocated. (I hope Mr. Trujillo hasn't oversold what the network is capable of!) > (I hope Mr. Trujillo hasn't oversold what the network is capable of!) Wouldn't surprise me in the slightest. He is running Tel$tra into the ground (just like all his previous appointments) and will do a moonlight flit with all the money just before it turns to sh.t!  SignatureThe views I present are that of my own and NOT of any organisation I may belong to. 73 de Simon, VK3XEM. <http://web.acma.gov.au/pls/radcom/client_search.client_lookup?pCLIENT_NO=157452> |
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