Beijing T3G Technology Co Ltd (T3G) and NXP Semiconductors have announced what they claim is the world's first voice automatic handover of multi-mode TD-SCDMA and GSM/GPRS/EDGE in a handset. This enables seamless usage for end-users by providing bi-directional on-the-fly automatic handover between TD-SCDMA and GSM networks.

T3G and NXP powered multi-mode handsets can automatically scan for available networks and switch between TD-SCDMA and GSM networks.

The automatic handover feature has been validated on T3G's TD-SCDMA/GSM/GPRS/EDGE dual mode handset reference design platform in multiple network environments built by major Chinese infrastructure vendors including Datang Mobile, ZTE and TD-Tech. Seamless automatic handover of voice calls between 3G TD-SCDMA R4 wireless network and 2.5G GSM/GPRS/EDGE mobile networks are supported.

Even while a call is being place, a TD-SCDMA/GSM phone equipped with the automatic handover feature moving out of TD-SCDMA network coverage will automatically switch the user onto the existing GSM network, without any adverse effects such as call drop. As network selection and transition are done by the phone automatically, TD-SCDMA subscribers will not have to make any manual selection of service.

Currently, TD-SCDMA networks are being rolled out in 10 Chinese cities including six host cities of Beijing Olympics by China Mobile and other Chinese operators. Automatic handover TD-SCDMA phones not only facilitate the provision of advance TD-SCDMA 3G services to interested audiences at these Olympic host cities, but also allow the continued use of existing 2.5G network.

This automatic handover is enabled by the Nexperia cellular system solution T3G 7208 GSM/GPRS/EDGE/TD-SCDMA reference design. Based on NXP's EDGE system solution, the design meets Chinese operators' plans to upgrade their 2G network to DEGE to offer fallback to data services.