The capital adversary to UMTS is CDMA2000 (IMT-MC), which is developed by the 3GPP2. Unlike UMTS, CDMA2000 is an evolutionary advancement to an absolute 2G standard, cdmaOne, and is able to accomplish aural the aforementioned abundance allocations. This and CDMA2000's narrower bandwidth requirements accomplish it easier to arrange in absolute spectra. In some, but not all, cases, absolute GSM operators alone accept abundant spectrum to apparatus either UMTS or GSM, not both. For example, in the US D, E, and F PCS spectrum blocks, the bulk of spectrum accessible is 5 MHz in anniversary direction. A accustomed UMTS arrangement would bathe that spectrum. Where CDMA2000 is deployed, it usually co-exists with UMTS. In abounding markets however, the co-existence affair is of little relevance, as aldermanic hurdles abide to co-deploying two standards in the aforementioned accountant allotment of spectrum.
Another adversary to UMTS is EDGE (IMT-SC), which is an evolutionary advancement to the 2G GSM system, leveraging absolute GSM spectrums. It is aswell abundant easier, quicker, and appreciably cheaper for wireless carriers to "bolt-on" EDGE functionality by advance their absolute GSM manual accouterments to abutment EDGE rather than accepting to install about all aboriginal accessories to bear UMTS. However, getting developed by 3GPP just as UMTS, EDGE is not a accurate competitor. Instead, it is acclimated as a acting band-aid above-mentioned UMTS roll-out or as a accompaniment for rural areas. This is facilitated by the actuality that GSM/EDGE and UMTS blueprint are accordingly developed and await on the aforementioned amount network, acceptance dual-mode operation including vertical handovers.
China's TD-SCDMA accustomed is generally apparent as a competitor, too. TD-SCDMA has been added to UMTS' Release 4 as UTRA-TDD 1.28 Mcps Low Chip Rate (UTRA-TDD LCR). Unlike TD-CDMA (UTRA-TDD 3.84 Mcps High Chip Rate, UTRA-TDD HCR) which complements W-CDMA (UTRA-FDD), it is acceptable for both micro and macro cells. However, the abridgement of vendors' abutment is preventing it from getting a absolute competitor.
While DECT is technically able of aggressive with UMTS and added cellular networks in densely populated, burghal areas, it has alone been deployed for calm cordless phones and clandestine centralized networks.
All of these competitors accept been accustomed by ITU as allotment of the IMT-2000 ancestors of 3G standards, forth with UMTS-FDD.
On the Internet admission side, aggressive systems cover WiMAX and Flash-OFDM.
Another adversary to UMTS is EDGE (IMT-SC), which is an evolutionary advancement to the 2G GSM system, leveraging absolute GSM spectrums. It is aswell abundant easier, quicker, and appreciably cheaper for wireless carriers to "bolt-on" EDGE functionality by advance their absolute GSM manual accouterments to abutment EDGE rather than accepting to install about all aboriginal accessories to bear UMTS. However, getting developed by 3GPP just as UMTS, EDGE is not a accurate competitor. Instead, it is acclimated as a acting band-aid above-mentioned UMTS roll-out or as a accompaniment for rural areas. This is facilitated by the actuality that GSM/EDGE and UMTS blueprint are accordingly developed and await on the aforementioned amount network, acceptance dual-mode operation including vertical handovers.
China's TD-SCDMA accustomed is generally apparent as a competitor, too. TD-SCDMA has been added to UMTS' Release 4 as UTRA-TDD 1.28 Mcps Low Chip Rate (UTRA-TDD LCR). Unlike TD-CDMA (UTRA-TDD 3.84 Mcps High Chip Rate, UTRA-TDD HCR) which complements W-CDMA (UTRA-FDD), it is acceptable for both micro and macro cells. However, the abridgement of vendors' abutment is preventing it from getting a absolute competitor.
While DECT is technically able of aggressive with UMTS and added cellular networks in densely populated, burghal areas, it has alone been deployed for calm cordless phones and clandestine centralized networks.
All of these competitors accept been accustomed by ITU as allotment of the IMT-2000 ancestors of 3G standards, forth with UMTS-FDD.
On the Internet admission side, aggressive systems cover WiMAX and Flash-OFDM.
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