This article has multiple issues. Unsourced material may be challenged and removed. Please update this article international building code 2015 pdf public access tm reflect recent events or newly available information.
UMTS requires new base stations and new frequency allocations. These speeds are significantly faster than the 9. GSM error-corrected circuit switched data channel, multiple 9. GSM family of speech codecs. Please note that the terms W-CDMA, TD-CDMA and TD-SCDMA are misleading.
3G sign shown in notification bar on an Android powered smartphone. 25 MHz channels for each direction of communication. 2155 MHz are used instead, as the 1900 MHz band was already used. However, divergent requirements resulted in the W-CDMA standard being retained and deployed globally. W-CDMA has then become the dominant technology with 457 commercial networks in 178 countries as of April 2012.