A TD-SCDMA wireless access network based on IP

At present, over 1 billion of the world's mobile users, Internet technology is also experiencing the same growth process. Having a mobile terminal that can quickly and stably access the Internet is the biggest challenge facing the third generation mobile communication. TD-SCDMA can be applied to all mobile communication environments from rural to intensive urban areas, from walking to high-speed mobile, and also to different network infrastructures, so that a smooth transition from the second generation to the third generation is possible. TD-SCDMA combines the two most successful technologies of mobile communications and the Internet over the last decade. TD-SCDMA will therefore be the most potent weapon against the challenge. --Editor
TD-SCDMA systems with a transmission rate of up to 2mbit/s can provide sufficient bandwidth to handle data services such as multimedia and mobile Internet applications. More importantly, its TDD feature enables TD-SCDMA to deal more effectively with asymmetric services (Internet downloads) than simple FDD technologies (e.g., wcdma;cdma2000 or edge). In an asymmetric frequency band, the uplink/downlink frequency is allocated according to the data traffic, and TD-SCDMA can optimize the air interface capacity so as to make more efficient use of the spectrum resources.
From another perspective, growing bandwidth requirements and the diversity of wireless technologies require a flexible, manageable network architecture that meets the growing needs of operators. In addition, highly personalized services and services that rely on commercial and personal terminals also require more rapid IP-inductive services. The IP-based mobile network (IPBMN), through an innovative design to achieve the perfect combination of IP and the Mobile world and to follow Internet rules, makes these ideals possible. At the same time, its network architecture is completely compatible with the third generation wireless interface, on the other hand, this new system structure has the potential of integration with the future wireless interface.
In the context of an ip-based wireless access network (Ipbran), it was initially an access network that could connect a client device (UE) to an ip-based core network (IPBCN) via a network element called a wireless access node (WLN). The main characteristic of ip-based wireless access network is distributed network architecture supported by a public IPv6 transport layer. "distributed" means to divide the logical layer and the physical layer of the RAN network elements into three functional levels: control level, user level and transmission level.
The design of wireless access network based on IP follows Internet rules in the following structural systems: clear separation of transport layer and control layer, distributed control and user plane based on open interface and standard protocol. According to the concept of ip-based wireless access network, the functions of wireless access Network (RAN) can be adapted to many wireless technologies, such as GSM, GPRS, EDGE, W-CDMA and TD-SCDMA. TD-SCDMA can be directly applied to ip-based wireless access network architecture. The dynamic channel allocation and cell synchronization functions can be placed in existing or new physical entities. When these two functions are applied to the architecture of ip-based wireless access networks, they can show great advantages in reducing the interference in the cell and small area. Conversely, a system that needs to implement its own synchronization mechanisms-such as GPS-based synchronous or aerial synchronization systems-becomes more independent of the underlying transport layer devices, that is, no reliance on SDH based synchronization.
To sum up, the TD-SCDMA air interface with the ip-based wireless access network perfectly integrated into an ideal future technology.