A Kind Of Overlay On The 3g Td
Activity of this paper, a superposition of the public in TD-SCDMA mobile communications network PTT (Push-To-Talk) Mobile Program. Its basic idea is to use the existing TD-SCDMA mobile phone network PTT service, business logic using half-duplex mode, supports one to one, one to many calls.
TD-SCDMA (Time Division-Synchronization Code Division MultipleAccess) of the Chinese meaning of the Time Division Synchronous Code Division Multiple Access, China’s TD-SCDMA has been made official as the world 3G One of the criteria. In recent years, China’s independent intellectual property rights technology TD-SCDMA has experienced many years of research and development in the test, to industrial-scale application of the critical period. China Mobile , China Telecom, China Netcom has 10 cities and regions of the TD-SCDMA network construction. In 10 cities, in addition to host Olympic Games, including Beijing, Tianjin, Shanghai, Qingdao, Qinhuangdao, Shenyang also include Xiamen and Baoding. TD-SCDMA in the future, users can at least reach the million, no doubt the Chinese 3G TD-SCDMA will play an important role in the times.
PTT (Push-To-Talk) is the “PoC” one click you can call functions like Interphone . The user presses a button you can immediately and one or more users to communicate, release the button the answer into passive state, it’s the Chinese translation of “PoC” vividly describes the characteristics of their business. Functional requirements on higher command and dispatch enterprises, railways, civil aviation, water conservancy, electric power, mining, oil fields, ports, light rail and metro, public prosecution, law, security, customs and the army, armed police and other departments, particularly in China held 2008 Olympic Games are very applicable. In fact, no lack of support around us
PTT mobile products: Nokia Of 3230,6270,6681; Motorola GSM dual-band support the MotorolaV400p, support and CDMA networks T300p V65p, other Samsung , LG, there are many support this technology. But China’s future mobile communication systems, particularly military systems must be based on independent research and development of next-generation broadband mobile Communications technology System, a fundamental building its own mobile communication system. The PTT-based TD-SCDMA mobile phones with independent intellectual property rights, can provide long-term information assurance and security, help promote the third generation mobile communication system, the development of civil-military coordination. As noted above, TD-SCDMA in China, a good momentum of development and various other communications equipment PTT can not be replaced by the favorable conditions, so this paper based on TD-SCDMA technology is very meaningful PTT phones and have great development potential.
Network structure superposition
A complete TD-SCDMA technology-based cluster system should include mobile terminals, base stations, Network equipment , Servers, dispatcher equipment, require a longer development cycle and greater manpower and financial input. Currently, there are mobile terminals (mobile phones), and China is a large-scale construction of TD-SCDMA network, in this case to avoid weaknesses in the existing mobile terminals, base stations and network equipment based on the definition of cluster-specific interfaces, development of appropriate server, database and scheduling platform to achieve clustering features to help the existing TD-SCDMA3G PTT mobile communications systems business. The mobile terminals to provide PTT services program is called overlay plan, which is the PTT technology TD-SCDMA3G mobile network.
1 network
Be achieved by superposition of TD-SCDMA digital trunking system, which required use the existing TD-SCDMA access network and core network; transform the existing terminal, the new cluster subsystem (Cluster Server, cluster databases, cluster console). Overlay mode TD-SCDMA digital trunking system network example shown in Figure 1.
2 New entities and subsystems
cluster terminal (PTT UE)
PTT terminal addition to TD-SCDMA terminals with the general features (voice, messaging, data services, etc.), PTT should have the following unique features: direct, such as group calling and group calling. With the transformation of TD-SCDMA mobile terminals with terminal clusters, the protocol stack shown in Figure 2. Map gray part of the original for the TD-SCDMA terminal protocol.
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