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Later, W-CDMA was selected as an air interface for UMTS.

As NTT Do Co Mo did not wait for the finalisation of the 3G Release 99 specification, their network was initially incompatible with UMTS.

W-CDMA uses the DS-CDMA channel access method with a pair of 5 MHz wide channels.

In contrast, the competing CDMA2000 system uses one or more available 1.25 MHz channels for each direction of communication.

While not an evolutionary upgrade on the airside, it uses the same core network as the 2G GSM networks deployed worldwide, allowing dual mode mobile operation along with GSM/EDGE; a feature it shares with other members of the UMTS family.

In the late 1990s, W-CDMA was developed by NTT Do Co Mo as the air interface for their 3G network FOMA.

W-CDMA systems are widely criticized for their large spectrum usage, which delayed deployment in countries that acted relatively slowly in allocating new frequencies specifically for 3G services (such as the United States).

Longer term, the 3GPP Long Term Evolution (LTE) project plans to move UMTS to 4G speeds of 100 Mbit/s down and 50 Mbit/s up, using a next generation air interface technology based upon orthogonal frequency-division multiplexing.However, this has been resolved by NTT Do Co Mo updating their network.Code Division Multiple Access communication networks have been developed by a number of companies over the years, but development of cell-phone networks based on CDMA (prior to W-CDMA) was dominated by Qualcomm, the first company to succeed in developing a practical and cost-effective CDMA implementation for consumer cell phones and its early IS-95 air interface standard has evolved into the current CDMA2000 (IS-856/IS-2000) standard.Please note that the terms W-CDMA, TD-CDMA and TD-SCDMA are misleading.While they suggest covering just a channel access method (namely a variant of CDMA), they are actually the common names for the whole air interface standards.

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