one, TD-MBMS principle Independent innovation in China TD-SCDMA HSDPA engineering has entered the era in the evolution of the TD-LTE on the highway, TD-SCDMA multimedia broadcasting is also an crucial milestone in one particular. TD-SCDMA multimedia broadcasting is Approaching.
With the cultural adjustments and improvements in technological innovation, mobile cellphone communications in addition to assembly basic requirements, its multi-functional and multi-mass media traits are turning into noticeable. From calls to text messages, from the Internet to the music, all kinds of facts surfacing price-additional services, these days delivers 3G + occasions allow us ?palm? grip television to grow to be reality. Nevertheless, the recent provision of mobile Tv is a home-based point unicast method of multimedia companies, reduced utilization of methods in this way, higher price, substantial tariff is not conducive to organization advertising and if this multipoint Mobile Broadcast broadcasting business is presently carried out only a brief text concept support, can not fulfill the diverse audio and video and information solutions.
Consequently, the world?s 3rd-era cellular communications specifications business 3GPP R6 edition released in the multimedia broadcast and multicast services features?? MBMS, its purpose is to help the business of broadcasting to numerous customers at the exact same time give substantial-pace data providers. In purchase to more successfully on the TD-SCDMA multi-press broadcasting companies (hereinafter referred to as TD-MBMS), in the introduction of an progressive bodily layer enhancement technological innovation, write 3GPPR7 and Evolution variation. Effectively, TD-MBMS for mobile users no matter whether these providers?
two, TD-MBMS software eventualities TD-MBMS is based mostly on the cell interaction community enhancements, which can not only carry out a typical cell Television services, can also provide a selection of other purposes. Overall, TD-MBMS solutions can be divided into two classes, 1 is broadcasting audio and movie content the other is broadcasting data or file content material. In certain, TD-MBMS there are the adhering to scenarios.
(1) radio station: hear to radio broadcasts via cell telephones
(two) Multimedia Magazine: with photos, enormous audio, sports, multimedia magazine studies issued
(three) on-line interaction: actual-time audience voting by cell cellphone to take part in evaluations, links can also be related to information inquiries or telephone browsing
(four) actual-time site visitors data: true-time traffic data broadcast, and can attach photos or video clip data
(5) Regional Info Broadcasting: a particular spot can be issued on promotional browsing shopping centers, vacationer points of interest and other information.
3, to attain the application of TD-MBMS
TD-MBMS purposes vary, but the realization of these applications can be grouped into flat bearing surface, and enterprise. TD-MBMS bearer plane packet-based mostly 3G network primarily based broadcasting community carrying capability, its implementation and the terminal (UE), radio accessibility network (RAN) and root network (CN)-associated services supplied by the upper airplane of enterprise purposes by the UE application layer and community support platform (broadcast procedures middle, BM-SC) to attain conclude to finish with. TD-MBMS network architecture demonstrated in Determine one in basic. Material providers to give content via multimedia material BM-SC will be transferred to the 3G root network, by means of the SGSN in Iu interface to forward to the entry community, and eventually by way of the NodeB (foundation station) is sent to the air user interface Uu UE, complete cellular Television and other multimedia material broadcast and exhibited.
Relative to the original community, TD-MBMS method attributes a new entity?? BM-SC, the team has been the domain of the purposeful entities such as SGSN, GGSN, RNC and the UE and so enhance the TD-MBMS operate, and determine a new The sensible channel (MTCH / MCCH, and so on.) to attain source sharing vacant.
Which, SGSN provides the person community handle, support for TD-MBMS motion among the receiver and in SGSN GGSN to mail the notification below the establishment or the launch of Iu, Gn and other load bearing function GGSN as TD-MBMS facts, IP Team multicast services nodes, according to BM-SC observe to request for the establishment or release user airplane radio bearer from the BM-SC or other data source to get IP multicast articles, and routing by means of the GTP tunnel and concept notification, billing facts selection, business QoS negotiation.
As a new network aspect, BM-SC features consists of content material distribution and organization management factors. Which content companies by way of the World wide web to submit code to the BM-SC and scrambled content material, is stored in the BM-SC and material of examination, and packet main community by means of the GGSN node to stream mass media (audio and movie broadcasting providers) or file (information broadcasting business) way to broadcast. The primary function of company administration are as follows.
(one) person authentication (two) company and content defense (three) important management (4) Company Information to management (five) company orders (six) Company Accounting. In addition, TD-MBMS enterprise security program based on hierarchical essential (shared key, consumer essential, key enterprise and software movement essential), the successful realization of user authentication, support order and articles encryption, the productive safety of the methods and operations stability.
4, TD-MBMS essential technology In contrast to other multimedia broadcasting standard, TD-MBMS with some exclusive crucial systems such as the next.
4.one Macro Diversity In the TD-MBMS program supports two sorts of macro diversity scheme. Option one is for the very same MBMS articles business, utilizing the very same frequency at the identical time gap, the exact same code channel, simultaneous ship the same articles, but use the very same code and scrambling code Midamble Alternative two is for the same MBMS articles enterprise, employing the same frequency level at the same time gap, with the code channels at the same time mail the very same content, but using the cell scrambling code and Midamble the authentic code.
four.one.1UTN macrodiversity Broadcasting time slots in transmission utilizing solitary frequency community configuration of the scenario, the amount of adjacent cell interference making use of uniform codes (including Midamble code), we can make sure that all cell indicators produced similar, UE only indicators from numerous communities as multi-path processing, can be quite easy to accomplish UTN macro diversity.
In this circumstance, when the transmitting radio in numerous little companies, RNC broadcast to many modest organization resource allocation, and specify the use of the broadcasting code and Midamble scrambling code, notify the NodeB through signaling and the UE the plot to use these particular codes to type a radio burst, and at the same time-frequency resources for transmission UE in the corresponding place of resources to several communities whilst getting the exact same transmission burst, after the code using the specified Midamble joint channel estimation, and the designation of the scrambling code for descrambling facts, to be ready to demodulate the broadcast business information.
four.1.two Joint detection of macro range
Broadcasting business in the transmission slot mining
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