Td Td-mbms Multimedia Broadcast Business Operations And Achieve-td-scdma, Td-mbms-communications

1, TD-MBMS concept Independent innovation in China TD-SCDMA HSDPA technology has

entered the era in the evolution of the TD-LTE on the road, TD-SCDMA multimedia broadcasting is also an important milestone in one. TD-SCDMA multimedia broadcasting is Approaching.

With the social changes and advances in technology, mobile phone communications in addition to meeting basic needs, its multi-functional and multi-media trends are becoming evident. From calls to text messages, from the Internet to the music, all kinds of data emerging value-added services, today brings 3G + times let us "palm" grip television to become reality. However, the current provision of mobile TV is a domestic point unicast mode of multimedia services, low utilization of resources in this way, high cost, high tariff is not conducive to business promotion; and if this multipoint Cell Broadcast broadcasting business is currently carried out only a short text message service, can not meet the diverse audio and video and data services.

Therefore, the world's third-generation mobile communications standards organization 3GPP R6 version introduced in the multimedia broadcast and multicast service functions?? MBMS, its purpose is to support the business of broadcasting to multiple users at the same time provide high-speed data services. In order to more effectively on the TD-SCDMA multi-media broadcasting services (hereinafter referred to as TD-MBMS), in the introduction of an innovative physical layer enhancement technology, write 3GPPR7 and Evolution version. Well, TD-MBMS for mobile users whether those services?

2, TD-MBMS application scenarios TD-MBMS is based on the mobile communication network enhancements, which can not only carry out a typical mobile TV service, can also provide a variety of other applications. Overall, TD-MBMS services can be divided into two categories, one is broadcasting audio and video content; the other is broadcasting data or file content. In particular, TD-MBMS there are the following scenarios.

(1) radio station: listen to radio broadcasts via mobile phones;

(2) Multimedia Magazine: with pictures, massive music, sports, multimedia magazine reports issued;

(3) online interaction: real-time audience voting by mobile phone to participate in reviews, links can also be related to information inquiries or phone shopping;

(4) real-time traffic information: real-time traffic information broadcast, and can attach photos or video information;

(5) Regional Information Broadcasting: a specific area can be issued on promotional shopping malls, tourist attractions and other information.

3, to achieve the application of TD-MBMS

TD-MBMS applications vary, but the realization of these applications can be grouped into flat bearing surface, and business. TD-MBMS bearer plane packet-based 3G network based broadcasting network carrying capacity, its implementation and the terminal (UE), radio access network (RAN) and core network (CN)-related; services provided by the upper plane of business applications by the UE application layer and network service platform (broadcast operations center, BM-SC) to achieve end to end with. TD-MBMS network architecture shown in Figure 1 in general. Content providers to provide content through multimedia content BM-SC will be transferred to the 3G core network, through the SGSN in Iu interface to forward to the access network, and finally through the NodeB (base station) is sent to the air interface Uu UE, complete mobile TV and other multimedia content broadcast and displayed.

Relative to the original network, TD-MBMS system features a new entity?? BM-SC, the group has been the domain of the functional entities such as SGSN, GGSN, RNC and the UE and so increase the TD-MBMS function, and define a new The logical channel (MTCH / MCCH, etc.) to achieve resource sharing empty.

Which, SGSN provides the user network control, support for TD-MBMS movement between the receiver and in SGSN GGSN to send the notification under the establishment or the release of Iu, Gn and other load bearing function; GGSN as TD-MBMS data, IP Group multicast service nodes, according to BM-SC notice to request for the establishment or release user plane radio bearer; from the BM-SC or other data source to receive IP multicast content, and routing through the GTP tunnel; and message notification, billing data collection, business QoS negotiation.

As a new network element, BM-SC functionality includes content distribution and business management aspects. Which content providers via the Internet to submit code to the BM-SC and scrambled content, is stored in the BM-SC and content of examination, and packet core network through the GGSN node to stream media (audio and video broadcasting services) or file (data broadcasting business) way to broadcast. The main function of business management are as follows.

(1) user authentication; (2) business and content protection; (3) key management; (4) Business Guide to management; (5) business orders; (6) Business Accounting. In addition, TD-MBMS business protection system based on hierarchical key (shared key, user key, key business and program flow key), the effective realization of user authentication, service order and content encryption, the effective protection of the systems and operations security.

4, TD-MBMS key technology Compared to other multimedia broadcasting standard, TD-MBMS with some unique key technologies including the following.

4.1 Macro Diversity In the TD-MBMS system supports two kinds of macro diversity scheme. Option 1 is for the same MBMS content business, using the same frequency at the same time gap, the same code channel, simultaneous send the same content, but use the same code and scrambling code Midamble; Option 2 is for the same MBMS content business, using the same frequency point at the same time gap, with the code channels simultaneously send the same content, but using the cell scrambling code and Midamble the original code.

4.1.1UTN macrodiversity Broadcasting time slots in transmission using single frequency network configuration of the case, the number of adjacent cell interference using uniform codes (including Midamble code), we can ensure that all cell signals emitted identical, UE only signals from multiple communities as multi-path processing, can be very simple to achieve UTN macro diversity.

In this case, when the transmitting radio in many small businesses, RNC broadcast to many small business resource allocation, and specify the use of the broadcasting code and Midamble scrambling code, inform the NodeB via signaling and the UE; the plot to use these specific codes to form a radio burst, and at the same time-frequency resources for transmission; UE in the corresponding location of resources to multiple communities while receiving the same transmission burst, after the code using the specified Midamble joint channel estimation, and the designation of the scrambling code for descrambling data, to be able to demodulate the broadcast business data.

4.1.2 Joint detection of macro diversity

Broadcasting business in the transmission slot mining

by: gaga

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