CN101754006B - Method and system for bearing mobile broadcasting service by China mobile multimedia broadcasting (CMMB) network - Google Patents
Method and system for bearing mobile broadcasting service by China mobile multimedia broadcasting (CMMB) network Download PDFInfo
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Abstract
The invention provides a method for bearing an open mobile alliance (OMA) BCAST mobile broadcasting service by a China mobile multimedia broadcasting (CMMB) network. The method comprises the following steps of: receiving CMMB signals transmitted by the CMMB network, and demodulating to obtain a plurality of multiplex frames, wherein the multiplex frames comprise at least one multiplex frame for bearing control information and at least one multiplex frame for bearing IP data; obtaining a required IP data packet from corresponding multiplex subframes of the multiplex frames through demultiplex operation according to the control information obtained by demodulating and obtaining the concrete data content of the required mobile broadcasting service. In the invention, the IP data packet is multiplexed to the multiplex subframes of a CMMB channel frame, and mapping among a CMMB service platform, a service mark and IP data is established, therefore, the IP data packet needed by an upper-layer OMA BCAS standard can be conveniently transmitted and obtained through standard multiplex and demultiplex operations, and physical bearing of the OMA BCAST in the CMMB network is realized.
Description
Technical field
The present invention relates to the mobile broadcast technical field, particularly relate to a kind of method of CMMB network carrying OMABCAST Mobile Broadcast Services, and a kind of front end system and terminal system for the CMMB network.
Background technology
CMMB (China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting) is the Mobile Multimedia Broadcasting standard of Chinese independent research.The CMMB system is vast in territory for China, transmission environment is complicated, urban compact western part, eastern region is sparse, numerous and the diversified characteristics of business demand of user, base oneself upon China's national situation, receive ripe advanced technology to design " Incorporate " system, that is: utilize high-power S-band satellite to cover national 100% territory, (for example utilize the ground overlay network, ground supplement translators etc.) carrying out crowded city effectively covers, mend point and cover the satellite-signal blind area, utilize mobile radio networks to make up two-way return path and realize alternately, form One-to-All Broadcast and two-way interaction and combine, the system of the seamless coverage that central and local governments combine.System architecture and composition are as shown in Figure 1.
The CMMB system can be low-cost, realize mobile multimedia broadcast signal in the covering in the whole nation rapidly, promotes making up of the western and eastern " digital divide ".Secondly, the STiMi transmission technology that the CMMB system adopts has taken into full account demand and the characteristics of carrying out Mobile Multimedia Broadcasting in China, and in a word, one of CMMB system has the proprietary technology scheme of advance, practicality and economy.
Although CMMB compare with class standard with other have advance, the characteristics of practicality and economy, but it is a new standard after all, having obtained ripe commercial standard with other compares, its research and practice aspect application layer is also slightly not aobvious, the at present main application of CMMB still in mobile TV, broadcasting, also is in test and exploratory stage at aspects such as data increment business, interactive services.
And OMA BCAST (Open Mobile Alliance Broadcast) is one of application layer standard of in the world relevant mobile multi-media broadcasting service, it is independent of any bearing technology, is widely used in DVB-T, DVB-H, ATSC, 3GPP MBMS, 3GPP BCMCS physical carrier network.Also there are a lot of manufacturers (such as Nokia, Motorola) to develop the commercial solution that meets OMA BCAST.
Purpose of the present invention solves how OMA BCAST business is fitted to CMMB exactly, and it is professional to carry OMA BCAST with the CMMB network.
Summary of the invention
Technical problem to be solved by this invention provides a kind ofly carries the method for OMABCAST broadcasting service with the CMMB network, thereby OMA BCAST business can be fitted to CMMB, so that more application service can be transmitted by the CMMB network.
In order to address the above problem, embodiments of the invention provide a kind of method of CMMB network carrying OMABCAST Mobile Broadcast Services, comprise: receive the CMMB signal by the CMMB Internet Transmission, obtain a plurality of multiplexed frames after the demodulation, be used for multiplexed frame and at least one multiplexed frame for carrying IP data of bear control information comprising at least one; Described IP data are carried with the multiplexed sub frame that the form of packet is multiplexed to multiplexed frame, described control information comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Described the second control information table is corresponding one by one with described CMMB platform, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table; Control information according to institute's demodulation obtains by de-multiplex operation, obtains required IP packet from the corresponding multiplexed sub frame of corresponding multiplexed frame, obtain the concrete data content of required Mobile Broadcast Services.
Preferably, described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame.
Preferably, described multiplexed sub frame comprises subframe head, video-frequency band, audio section and data segment, and described IP packet is multiplexed to the data segment of multiplexed sub frame.
Preferably, described IP data comprise electron service instruction IP data or the professional IP data of common application.
According to another embodiment of the present invention, a kind of front end system for the CMMB network is also disclosed, comprising:
The data broadcast service front end is for the concrete data content that Mobile Broadcast Services is provided;
The IP operation unit is used for the concrete data content for Mobile Broadcast Services, generates the IP packet;
The CMMB Multiplexing Unit is used for carrying out multiplexing operation for described IP packet, with the multiplexed sub frame of IP packet multiplexing to multiplexed frame, obtains the CMMB transmission channel frame; A transmission channel frame comprises a plurality of multiplexed frames, be used for the multiplexed frame of bear control information comprising at least one, described CMMB Multiplexing Unit is multiplexed into following control information in the multiplexed sub frame of multiplexed frame, obtain the multiplexed frame for bear control information, described control information comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Each CMMB platform has one to one the second control information table, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table;
The CMMB modulation sending unit is used for modulation and obtains the CMMB signal, utilizes the CMMB network to transmit.
Preferably, described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame respectively.
Fig. 2 is the functional requirement of OMA BCAST of prior art and the schematic diagram of related protocol stack;
Fig. 3 is the configuration diagram that the present invention passes through CMMB network carrying OMABCAST applied business;
Preferably, described CMMB Multiplexing Unit is with the data segment of IP packet multiplexing to multiplexed sub frame; Described IP data comprise electron service instruction IP data or the professional IP data of common application.
According to another embodiment of the present invention, a kind of terminal system for the CMMB network is also disclosed, comprising:
Radio frequency unit is used for receiving the CMMB signal;
Demodulating unit is used for described CMMB signal is carried out demodulation, obtains a plurality of multiplexed frames; Be used for the multiplexed frame of bear control information comprising at least one, the control information that described demodulating unit obtains comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Each CMMB platform has one to one the second control information table, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table;
Demultiplexing unit is used for by de-multiplex operation, obtaining required IP packet according to described control information from the corresponding multiplexed sub frame of corresponding multiplexed frame, obtains the concrete data content of required Mobile Broadcast Services.
Preferably, described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame.
Preferably, described CMMB Multiplexing Unit is with the data segment of IP packet multiplexing to multiplexed sub frame; Described IP data comprise electron service instruction IP data and the professional IP data of common application.
Compared with prior art, the present invention has the following advantages:
At first that OMA BCAST broadcasting service is the required IP packet multiplexing of the present invention is in the multiplexed sub frame of CMMB channel frame, and in broadcast channel frame, be provided with the new control information table of two classes, made up the mapping between CMMB business platform, service identification and the OMA BCAST broadcasting service IP data; Thereby in the signal transmission of CMMB network, by the multiplexing and de-multiplex operation of standard, just can transmit easily and obtain the required IP packet of upper strata OMA BCAST standard, realize the physical carrier of OMABCAST broadcast service data in the CMMB network.
Description of drawings
Fig. 1 is the CMMB system architecture of prior art and forms schematic diagram;
Fig. 2 is the functional requirement of OMA BCAST of prior art and the schematic diagram of related protocol stack;
Fig. 3 is the configuration diagram that the present invention passes through CMMB network carrying OMABCAST applied business;
Fig. 4 is the flow chart of steps of the embodiment of the method for a kind of CMMB network carrying of the present invention OMABCAST Mobile Broadcast Services;
Fig. 5 is the frame head structural representation of multiplexed frame in the CMMB network;
Fig. 6 is the structural representation of the multiplexed frame of bear control information;
Fig. 7 is the structural representation of the multiplexed frame of bearer service information;
Fig. 8 is the structural representation of multiplexed sub frame;
Fig. 9 is the concrete structure schematic diagram of the data segment of multiplexed sub frame;
Figure 10 is without the schematic diagram of the IP packet encapsulation mode of XPE encapsulation in a kind of data cell;
Figure 11 is the schematic diagram that the IP packet encapsulation mode of XPE encapsulation is arranged in a kind of data cell;
Figure 12 is the structural representation of the multiplexed frame example of the concrete control information table of carrying;
Figure 13 is the information flow direction schematic diagram of a CMMB network carrying of the present invention OMA BCAST Mobile Broadcast Services specific embodiment;
Figure 14 is the structural representation of a kind of front end system embodiment for the CMMB network of the present invention;
Figure 15 is the structural representation of a kind of terminal system embodiment for the CMMB network of the present invention;
Figure 16 is data flow schematic diagram embodiment illustrated in fig. 15.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to Fig. 2, show the functional requirement of OMA BCAST and relevant protocol stack.In the left side of straight line 201, show the functional requirement module of OMA BCAST; On the right side of straight line 201, the agreements such as the Streaming Media that comprises on the IP layer, file reparation all are the related protocols of OMA BCAST.From the schematic diagram of Fig. 2, can find out that all OMA BCAST applied business all are based on the IP agreement.That is to say that the present invention will be at CMMB network carrying OMABCAST applied business, emphasis need to solve the IP data how in the problem of CMMB transmission over networks, that is: one is the multiplexing transmission of the IP packet of OMA BCAST applied business; The 2nd, how demultiplexing finds these IP packet that is re-used and transmits, the i.e. definition of number of C MMB signaling and multiplexing transmission.
With reference to Fig. 3, show the present invention by the configuration diagram of CMMB network carrying OMA BCAST applied business, similar with Fig. 2, difference is: be the multiplexing and wireless transmission scheme of CMMB under the IP layer.Describe concrete scheme of the present invention in detail below by several embodiments of the present invention.
With reference to Fig. 4, show the embodiment of the method for a kind of CMMB network carrying of the present invention OMA BCAST Mobile Broadcast Services, specifically can comprise:
The Mobile Broadcast Services of mentioning among the present invention can comprise the various multimedia services based on one-to-many transmission meanss such as broadcasting (Broadcast) and multicasts (Multicast).Concrete, can comprise mobile TV, broadcasting, data increment business, interactive service, service protection and mandate, file distributing etc.
Certainly, if above-described embodiment only is described from receiving terminal, then can may further comprise the steps:
(1) receives the CMMB signal that passes through the CMMB Internet Transmission, obtain a plurality of multiplexed frames after the demodulation, be used for multiplexed frame and at least one multiplexed frame for carrying IP data of bear control information comprising at least one; Described IP data are carried with the multiplexed sub frame that the form of packet is multiplexed to multiplexed frame;
(2) control information that obtains according to institute's demodulation by de-multiplex operation, obtains required IP packet from the corresponding multiplexed sub frame of corresponding multiplexed frame, obtain the concrete data content of required Mobile Broadcast Services.
The below is to being elaborated the process of IP packet multiplexing to the multiplexed sub frame of multiplexed frame.
In CMMB, a plurality of multiplexed frames consist of a broadcast channel frame.A multiplexed frame is comprised of multiplex frame head, multiplexed frame payload and filling, the multiplex frame head structure as shown in Figure 5: can comprise multiplexed frame initial code, multiplexed frame sign, next frame parameter indication, multiplexed sub frame number, each multiplexed sub frame length etc.The multiplexed frame payload is comprised of one or more multiplexed sub frame, for example, can comprise 15 multiplexed sub frames.
The multiplexed frame of MF_ID=0 is used for bear control information, uses the control logic channel to transmit, and can with a control information table as a multiplexed sub frame, see Fig. 6 this moment.Wherein, described control information can comprise the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table.
The multiplexed frame of MF_ID unequal to 0 is used for bearer service, and multiplexed sub frame of a professional correspondence (business does not refer to professional classification herein, but expression has the concrete business of server ID) is seen Fig. 7.
Multiplexed sub frame is comprised of subframe head, video-frequency band, audio section and data segment, and video-frequency band, audio section and data segment are used for respectively carrying video data, voice data and datacast data.See Fig. 8 for details, the subframe head of multiplexed sub frame can comprise a length, audio section length, video-frequency band length, initial reproduction time etc.Because the multiplexed frame under the CMMB and the details of multiplexed sub frame belong to well-known to those skilled in the art, the simple introduction gets final product.
For above-mentioned multiplexed frame and multiplexed sub frame, the required IP packet of OMA BCAST applied business can multiplexing data segment to described multiplexed sub frame, to be implemented in the IP Deta bearer in the multiplexed frame.Concrete, the IP data of OMA BCAST business can be divided into two types in multiplexing aspect:
ESG is professional: comprise the IP stream that Bootstrap, SG (Service Guide) etc. are professional; Wherein, ESG is writing a Chinese character in simplified form of Electronic Service Guide, usually is translated as electron service instruction;
IP operation: i.e. general OMA BCAST applied business comprises video, audio frequency and data service etc.
Above-mentioned two types IP data can be multiplexed into the data segment of multiplexed sub frame.Common, with reference to Fig. 9, data segment can be comprised of data segment header and a plurality of data cell.Simply, only an IP packet multiplexing need to be encapsulated in the data unit of data segment and get final product.Further, in some preferred embodiment, IP data packet number in a business (the perhaps once professional) transmission is possibly more than 255, and the data segment in multiplexed sub frame can comprise at most 255 data unit usually, be that the IP data packet number is more than the quantity of data cell, therefore, on implementation strategy, can adopt the mode of one or more IP packet of data unit package to realize.
When specifically the IP data envelope being installed to data cell, can select to adopt XPE (the expansible protocol encapsulation of ExtensibleProtocol Encapsulation) encapsulation, also can not adopt the XPE encapsulation.With reference to Figure 10, show a kind of IP packet encapsulation mode without the XPE encapsulation, each data cell encapsulates one or more IP packet, and the data cell type can be defined as with CMMB and define the unduplicated numerical value of data cell type.Because in common CMMB multiplexed frame, concrete business datum all needs the XPE encapsulation, so need to set a different types value for this data cell, for example, OxAB does not select to adopt the XPE encapsulation with the IP packet that the data cell parameter in the data segment header of data segment indicates in this data cell.
Referring to Figure 11, show a kind of IP packet encapsulation mode of the XPE of having encapsulation, the IP packet through encapsulation is encapsulated as a plurality of XPE heads and XPE payload; The data cell type of this moment adopts the parameter value of CMMB defined to get final product, for example 0xA0.
The below provides each field value table of a concrete XPE head (only being an example), and is as shown in table 1.
Table 1
| Field | Value | Remarks |
| Opening flag | ‘1’ | IP unwraps the beginning |
| End mark | ‘1’ | The IP end-of-packet |
| Marker bit | ‘0’ | |
| The error correction indication | ‘0’ | Do not carry out error correction coding |
| Payload length | Variable | |
| The CRC indication | ‘0’ | Without CRC, because IP/UDP itself has CRC |
| Transmission sequence number r | The 7bit counting | |
| The business model indication | ‘0’ | Stream mode |
| Verification and | XOR | |
| Payload | Variable |
The below is how to realize the multiplexing and demultiplexing of IP packet to concrete control information (perhaps signaling), is described in detail.
Among the embodiment in front, described control information can comprise the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table.
The CMMB platform is exactly an autonomous system that various Mobile Broadcast Services externally are provided, and for example, different operators is CMMB platform etc. independently separately.From the IP angle, CMMB Platform (CMMB platform) represents an IP address space, is used for distinguishing all IP streams that belong to this platfom.For example in the IP stream situation from different sources, it provides a method that is used for management ip address.
The simplest situation, whole CMMB network only exist CMMB platform or an operator that service is provided, for example the broadcasting and TV of China.In fact, also can there be a plurality of independently CMMB platforms in the applied CMMB network of the present invention, and it can belong to different operators owns.
Can comprise a CMMB Platform in the CMMB signal, simultaneously, several CMMBPlatform also can coexist in a CMMB signal.Each CMMB Platform has its business guide (Service Guide is called for short SG), is used for announcing the IP operation among the CMMB Platform.Preferably, an operator can only use a CMMBPlatform in its CMMB network.CMMB Platform can distinguish by a unique ID of the overall situation.
Point out in the description of front, different control information tables, can be multiplexed into identification number and be in 0 the multiplexed frame, with reference to Figure 12, show the example of several concrete control information tables, comprise lasting period service duplexing configuration list, short-period service duplexing configuration list and aforesaid the first control information table and the second control information table.
In Figure 12, our the second control information table adopts IMCT (IP MultiplexConfiguration Table) expression, also can be referred to as the IP reuse allocation list.It is corresponding one by one with described CMMB platform, can comprise all service identifications that belong to this CMMB platform, and namely CMMB platform has oneself an IMCT table, has recorded all service identifications of this CMMB platform in this table.
Described the first control information table adopts IAT (IMCT Association Table) expression, also can be referred to as the IMCT contingency table.It is mainly used in pointing out the association between CMMB Platform and the CMMB service identification, on IMCT and IAT related, can carry out association by ID number of CMMB Platform.Namely for a broadcast channel frame, can be by being designated in 0 the multiplexed frame IAT as entrance, find certain CMMB Platform and corresponding service identification, then find corresponding IMCT table, therefrom obtain the corresponding multiplexed sub frame of this service identification and corresponding IP address information.Be that IAT provides the related of CMMB and an IP protocol platform (CMMB platform), and IMCT provides a CMMB IP professional and in multiplexed frame to flow the related of (IP packet), these two synergy has realized the multiplexing and demultiplexing of IP packet in the CMMB transmission channel frame.
Further, owing to need to exist a multiplexed frame in each transmission channel frame, be used for transmitting IAT table and IMCT table for the current transmission channel frame, therefore, the sequence number of IAT table and IMCT table all needs to upgrade.IAT upgrades sequence number and IMCT renewal sequence number should be announced (seeing Fig. 5 for details) in the multiplex frame head of all carrying OMA BCAST business.For example, can adopt the expansion control information in the multiplex frame head to upgrade the renewal that sequence number represents IAT and IMCT.Concrete, in order to transmit accuracy, no matter can be defined as is IAT or IMCT, so long as wherein the information of carrying changes, this field value all will change.In a preferred embodiment of the invention, this field value is in 0～15 circulation value, and each the renewal adds 1.Can check that according to the variation of this value whether CMMB Platform or business change, and obtain last state.
The below describes in detail to the IAT table.
In an IAT table, to each the CMMB Platform in the current network, IAT should only comprise an entrance, avoids causing the association chaos of IMCT table.Certainly, under the preferable case, a broadcast channel frame also should have an IAT, otherwise, can cause that also the entrance of IAT is chaotic.
The syntactic definition of IAT can be referring to table 2.
Table 2:IAT
| Grammer | Figure place | Identifier |
| { the table identification number keeps IAT table updating sequence number Platform quantity for (i=0 to IAT table (); I＜N1; I++) { Platform identification number Platform title length | 8 4 4 8 24 8 | uimsbf bslbf bslbf uimsbf uimsbf uimsbf |
[0088]
| For (j=0; J＜N2; J++) { character } service identification } CRC_32 } | 8 16 32 | Uimsbf uimsbf uimsbf |
The table identification number: 8 bit fields, for example, value 0x08
The IAT table updating sequence number: 4 bit fields, when changing appearred in the information of describing in this table, the IAT table updating sequence number needed to change, the value that in the 0-15 scope, circulates, the each renewal adds 1.
Platform quantity: 8 bit fields, the quantity of Platform in the expression network.
Platform identification number: 24 bit fields, the Platform identification number that the overall situation is unique.
Platform title length: 8 bit fields, for the length of describing the Platform title, unit is byte.
Character: 8 bit fields, a character string provides the title of Platform.
Service identification: 16 bit fields, the identification number of expression OMA BCAST ESG business.Be used to provide the association between IAT and the CMCT/SMCT.
The CRC_32:32 bit field comprises crc value.
The below describes in detail to the IMCT table.
Each CMMB Platform has unique IMCT table, is associated by Platform identification field and CMMB Platform in the IMCT table.Comprised all service identifications that belong to certain CMMBPlatform in the IMCT table, and and all identifier information of certain traffic aided.For IPv4 and IPv6, identifier is exactly IP source address and IP destination address pair.The syntactic definition of IMCT table sees Table 3.
Table 3:IMCT
| Grammer | Figure place | Identifier |
| { table identification number joint length joint sequence number joint number amount IAT table updating sequence number type of identifier Platform sign comprises number of services for (i=0 to IMCT table (); I＜N1; I++) identifier quantity if (type of identifier==IPv4) { IPv4 source address IPv4 destination address } elseif (type of identifier==IPv6) { IPv6 source address IPv6 destination address } else{ private type identifier length for (j=0; J＜N2; J++) | 8 16 8 8 4 4 24 16 8 32 32 128 128 16 8 | uimsbf uimsbf uimsbf uimsbf bslbf bslbf uimsbf uimsbf uimsbf uimsbf uimsbf uimsbf uimsbf uimsbf uimsbf |
[0101]
| The private type identifier } } service identification } CRC_32 } | 16 32 | uimsbf uimsbf |
Table identification number: 8 bit fields, value 0x09.
Joint length: 16 bit fields, joint length.Comprise the table identification number, do not comprise CRC_32, the unit byte.
The joint sequence number: 8 bit fields, expression IMCT table joint sequence number since 0 counting, adds 1 at every turn.
The joint number amount: 8 bit fields represent a total joint number amount of IMCT table.
The IMCT table updating sequence number: 4 bit fields, when changing appearred in the information of describing in this table, the IMCT table updating sequence number needed to change, the value that in the 0-15 scope, circulates, the each renewal adds 1.
Type of identifier: 4 bit fields, the type of identifier in the expression table, each IMCT table can only have a kind of type of identifier.
Platform identification number: 24 bit fields, the Platform identification number that the overall situation is unique.
Comprise number of services: 16 bit fields, the quantity of the business that comprises in the IMCT table.
Identifier quantity: 8 bit fields, the quantity of the identifier of expression traffic aided.When the value of type of identifier was 0x01 or 0x02, identifier quantity was exactly IP source address and the right quantity of IP destination address.
The IPv4 source address: 32 bit fields represent IPv4 clean culture, multicast or a broadcast source address.Be expressed as 0xE000170E such as 224.0.23.14.
The IPv4 destination address: 32 bit fields represent an IPv4 clean culture, multicast or broadcasting destination address.
The IPv6 source address: 128 bit fields represent IPv6 clean culture, multicast or a broadcast source address.For example 1030:0:0:0:C9B4:FF12:48AA:1A2B is expressed as 0x1030000000000000C9B4FF1248AA1A2B.
The IPv6 destination address: 128 bit fields represent an IPv6 clean culture, multicast or broadcasting destination address.
Service identification: 16 bit fields, the identification number that expression is professional.Be used to provide IP operation that IMCT comprises and the association between the CMCT/SMCT.
The CRC_32:32 bit field comprises crc value.
With reference to Figure 13, show concrete example of the present invention.
In the CMMB transmission, terminal system receives and demodulation obtains a plurality of multiplexed frames, and 3 multiplexed frames have been shown among Figure 13, and identification number is respectively 0,1 and 2.
Wherein, identification number is to have recorded IAT table and IMCT table in 0 the multiplexed frame, and the CMCT that just needs in former CMMB standard table (for pointing out the related of service identification and multiplexed sub frame); Identification number is in 1 the multiplexed frame, to have recorded electron service instruction IP data; For example, the IP stream of Bootstrap and the IP stream of SG (Service Guide) have been comprised in the multiplexed frame among Figure 13.Identification number is to have carried different a plurality of business by each multiplexed sub frame in 2 the multiplexed frame.
With reference to Figure 13, it is 0 multiplexed frame by the demultiplexing identification number, obtain IAT table, IMCT table and CMCT table, be associated by a CMMB service platform ID and an IMCT table in the IAT table, then the service identification of showing by the service identification in the IAT table and/or corresponding IMCT, find multiplexed sub frame the corresponding multiplexed frame from CMCT table, for example, finding identification number is multiplexed sub frame 1 in 1 the multiplexed frame.
Obtain the Bootstrap of electron service instruction from identification number is multiplexed sub frame 11 the multiplexed frame, then according to the IP address information in this subframe, the IMCT table that is associated before returning finds next service identification number.
Then repeat said process, finding identification number from CMCT table is multiplexed sub frame 21 the multiplexed frame.Obtain the information of the concrete professional A of electron service instruction ESG from identification number is multiplexed sub frame 21 the multiplexed frame, then according to the IP address information in this subframe, the IMCT table that is associated before returning finds next service identification number.
And then finding identification number according to this next service identification number from the CMCT table is multiplexed sub frame 12 the multiplexed frame, has obtained the IP packet for professional A.
Figure 13 only shows a simple example, has illustrated that terminal is how by the control information table in the multiplexed frame, interrelated, thereby obtains required IP packet.Other example application please refer to understanding and get final product.
In the example shown in Figure 13, acquisition process for the IP packet of professional A, passed through the IP stream of electron service instruction Bootstrap and ESG, but those skilled in the art's easy to understand, in actual applications, in some transmission channel frame, also can directly carry the IP packet of concrete business, and not necessarily must in each transmission channel frame, must carry the IP stream of electron service instruction Bootstrap and ESG.Certainly, in actual applications, because Mobile Broadcast Services is for large-scale mass users, certain user be continuously reception, the IP flow data that then may not need electron service instruction Bootstrap and ESG, but other users may just begin to receive, and then need above-mentioned IP stream, therefore, preferably, in each transmission channel frame, carry the IP stream of electron service instruction Bootstrap and ESG, if the user does not need, then do not carry out parse operation and get final product.
For the above-mentioned solution of passing through CMMB network carrying IP packet, need to all do some corresponding changes to existing CMMB front end system and terminal system, to adapt to the variation of control information.
With reference to Figure 14, show a kind of embodiment of the front end system for the CMMB network, it has specifically comprised:
Data broadcast service front end 1401 is for the concrete data content that Mobile Broadcast Services is provided;
IP operation unit 1402 is used for the concrete data content for Mobile Broadcast Services, generates the IP packet; Need to prove that the IP operation unit also can be referred to as the IP operation system in actual applications usually, herein in order to describe facility, adopted " unit " word;
CMMB Multiplexing Unit 1403 is used for carrying out multiplexing operation for described IP packet, with the multiplexed sub frame of IP packet multiplexing to multiplexed frame, obtains the CMMB transmission channel frame; A transmission channel frame comprises a plurality of multiplexed frames, is used for the multiplexed frame of bear control information comprising at least one;
CMMB modulation sending unit 1404 is used for modulation and obtains the CMMB signal, utilizes the CMMB network to transmit.
Wherein, described control information comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table.Described the second control information table is corresponding one by one with described CMMB platform, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame.
Accordingly, for the front end system of Figure 14, with reference to Figure 15, show a kind of terminal system for the CMMB network, specifically can comprise:
Radio frequency unit 1501 is used for receiving the CMMB signal;
Demodulating unit 1502 is used for described CMMB signal is carried out demodulation, obtains a plurality of multiplexed frames; Be used for the multiplexed frame of bear control information comprising at least one;
Demultiplexing unit 1503 is used for by de-multiplex operation, obtaining required IP packet according to described control information from the corresponding multiplexed sub frame of corresponding multiplexed frame, obtains the concrete data content of required Mobile Broadcast Services.
With reference to Figure 16, the embodiment of above-mentioned terminal system receives the CMMB signal by radio-frequency front-end, then obtains multiplexed frame by demodulation simultaneously; And then obtain the IP packet by the demultiplexing to a plurality of multiplexed frames, and give the IP operation processing module or the IP application program is processed, satisfy user's terminal traffic demand; Certainly, in above-mentioned execution flow process, also there is the processing procedure of control logic and CMMB signaling, specifically no longer describes in detail.
In the above-described embodiments, because the change of control information among the present invention, concrete demultiplexing process is also different, needs to use two control information tables that the present invention increases newly, and is interrelated to obtain required IP data from multiplexed sub frame.Described control information comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table.Described the second control information table is corresponding one by one with described CMMB platform, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
More than to the method for a kind of CMMB network carrying OMABCAST Mobile Broadcast Services provided by the present invention, and a kind of front end system and terminal system for the CMMB network, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the method for a CMMB network carrying OMA BCAST Mobile Broadcast Services is characterized in that, comprising:
Receive the CMMB signal by the CMMB Internet Transmission, obtain a plurality of multiplexed frames after the demodulation, be used for multiplexed frame and at least one multiplexed frame for carrying IP data of bear control information comprising at least one; Described IP data are carried with the multiplexed sub frame that the form of packet is multiplexed to multiplexed frame, described control information comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Described the second control information table is corresponding one by one with described CMMB platform, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table;
Control information according to institute's demodulation obtains by de-multiplex operation, obtains required IP packet from the corresponding multiplexed sub frame of corresponding multiplexed frame, obtain the concrete data content of required Mobile Broadcast Services.
2. the method for claim 1 is characterized in that,
Described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame.
3. the method for claim 1 is characterized in that,
Described multiplexed sub frame comprises subframe head, video-frequency band, audio section and data segment, and described IP packet is multiplexed to the data segment of multiplexed sub frame.
4. the method for claim 1 is characterized in that,
Described IP data comprise electron service instruction IP data or the professional IP data of common application.
5. a front end system that is used for the CMMB network is characterized in that, comprising:
The data broadcast service front end is for the concrete data content that Mobile Broadcast Services is provided;
The IP operation unit is used for the concrete data content for Mobile Broadcast Services, generates the IP packet;
The CMMB Multiplexing Unit is used for carrying out multiplexing operation for described IP packet, with the multiplexed sub frame of IP packet multiplexing to multiplexed frame, obtains the CMMB transmission channel frame; A transmission channel frame comprises a plurality of multiplexed frames, be used for the multiplexed frame of bear control information comprising at least one, described CMMB Multiplexing Unit is multiplexed into following control information in the multiplexed sub frame of multiplexed frame, obtain the multiplexed frame for bear control information, described control information comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Each CMMB platform has one to one the second control information table, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table;
The CMMB modulation sending unit is used for modulation and obtains the CMMB signal, utilizes the CMMB network to transmit.
6. front end system as claimed in claim 5 is characterized in that,
Described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame respectively.
7. front end system as claimed in claim 5 is characterized in that,
Described CMMB Multiplexing Unit is with the data segment of IP packet multiplexing to multiplexed sub frame; Described IP data comprise electron service instruction IP data or the professional IP data of common application.
8. a terminal system that is used for the CMMB network is characterized in that, comprising:
Radio frequency unit is used for receiving the CMMB signal;
Demodulating unit is used for described CMMB signal is carried out demodulation, obtains a plurality of multiplexed frames; Be used for the multiplexed frame of bear control information comprising at least one, the control information that described demodulating unit obtains comprises the first control information table for mapping relations between record CMMB platform and the CMMB service identification, and be used for record CMMB service identification and with the second control information table of the IP identifier information of this traffic aided; Each CMMB platform has one to one the second control information table, and the second control information table comprises all service identifications that belong to this CMMB platform; Described the second control information table is realized related by CMMB platform identification field wherein with described the first control information table;
Demultiplexing unit is used for by de-multiplex operation, obtaining required IP packet according to described control information from the corresponding multiplexed sub frame of corresponding multiplexed frame, obtains the concrete data content of required Mobile Broadcast Services.
9. terminal system as claimed in claim 8 is characterized in that,
Described the first control information table and the second control information table are multiplexing at a multiplexed frame that is used for bear control information as multiplexed sub frame.
10. terminal system as claimed in claim 8 is characterized in that,
Described CMMB Multiplexing Unit is with the data segment of IP packet multiplexing to multiplexed sub frame; Described IP data comprise electron service instruction IP data and the professional IP data of common application.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101018342A (en) * | 2007-03-03 | 2007-08-15 | 中兴通讯股份有限公司 | A multi-channel transmission method of mobile multi-media broadcast electronic business guide |
| CN101414887A (en) * | 2008-11-27 | 2009-04-22 | 中兴通讯股份有限公司 | Method and system for implementing data broadcast |
| CN101420278A (en) * | 2007-10-26 | 2009-04-29 | 国家广播电影电视总局广播科学研究院 | Method and system for implementing IP packet multiplexing broadcast based on CMMB channel |
| CN101437034A (en) * | 2008-12-18 | 2009-05-20 | 北京创毅视讯科技有限公司 | Data business transmission method, system and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101018342A (en) * | 2007-03-03 | 2007-08-15 | 中兴通讯股份有限公司 | A multi-channel transmission method of mobile multi-media broadcast electronic business guide |
| CN101420278A (en) * | 2007-10-26 | 2009-04-29 | 国家广播电影电视总局广播科学研究院 | Method and system for implementing IP packet multiplexing broadcast based on CMMB channel |
| CN101414887A (en) * | 2008-11-27 | 2009-04-22 | 中兴通讯股份有限公司 | Method and system for implementing data broadcast |
| CN101437034A (en) * | 2008-12-18 | 2009-05-20 | 北京创毅视讯科技有限公司 | Data business transmission method, system and apparatus |
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