CN101938659A - Method and device for expanding services in mobile multimedia broadcast system - Google Patents
Method and device for expanding services in mobile multimedia broadcast system Download PDFInfo
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- CN101938659A CN101938659A CN2009101484701A CN200910148470A CN101938659A CN 101938659 A CN101938659 A CN 101938659A CN 2009101484701 A CN2009101484701 A CN 2009101484701A CN 200910148470 A CN200910148470 A CN 200910148470A CN 101938659 A CN101938659 A CN 101938659A
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Abstract
The invention discloses a method for expanding services in a mobile multimedia broadcast system, which comprises: packaging a basic service flow in a multiplex frame; generating an enhanced data flow for the basic service flow; and transmitting the multiplex frame, which carries the basic service flow, and the enhanced data flow. The invention also discloses a device for expanding the services in the mobile multimedia broadcast system, which comprises: a first packaging unit used for packaging the basic service flow in the multiplex frame; a generation unit used for generating the enhanced data flow for the basic service flow; and a transmitting unit used for transmitting the transmitting the multiplex frame, which carries the basic service flow, and the enhanced data flow. The method and the device improve the service quality of the basic services in the broadcast system.
Description
Technical field
The present invention relates to professional expansion technique, relate in particular to professional extended method and device in a kind of mobile multimedia broadcast system.
Background technology
At China Mobile multimedia broadcasting (CMMB, China Mobile Multimedia Broadcasting) in the system, multiplexing the finishing of information vias such as audio frequency, video, electron service instruction encapsulates and arranges, and forms multiplexed frame, transmits by mobile multimedia broadcasting channel.
Having defined CMMB among the broadcast television industry standard C MMB Channel Modulation standard GY/T220.1 adopts OFDM (OFDM, Orthogonal Frequency Division Multiplexing) technology to carry out chnnel coding.Fig. 1 is the composition structural representation of CMMB channel frame, as shown in Figure 1, a CMMB channel frame is divided into 40 time slots, each time slot is 25ms, a multiplexed frame can take one or more time slots arbitrarily, multiplexed frame is identified by multiplexed frame sign MF ID, and MF ID equals 0 interval scale control channel multiplexed frame, is not equal to 0 the common multiplexed frame that is.The control information of time slot 0 transmission multiplexed frame also is the control information multiplexed frame, and the control information multiplexed frame is made up of frame head and control information table.A multiplexed frame is made up of multiplex frame head, multiplexed frame payload and filling, and the miscellaneous service data are all carried in multiplexing payload.The multiplexed frame payload is divided into a plurality of multiplexed sub frames again, and multiplexed sub frame can be divided into subframe head, video-frequency band, audio section and data segment again and form; For guaranteeing the size unanimity of each multiplexed frame, all fill with 0xFF at afterbody.Can call original basic service flows to multiplex frame head and multiplexed frame payload.
Existing multiplexed frame structure provides functions such as transmission audio frequency and video business, data; But, along with application and development, be necessary on existing business data basis, to increase some and strengthen data, as scalable video coding (SVC, Scalable Video Coding) strengthens data flow, forward error correction (FEC, Forward Error Correction) strengthen data flow, program association information flow etc., but existing multiplexed frame standard does not provide clear and definite support.Data such as basic time, space and quality to original basic service flows are described in more detail formation SVC enhancing data flow, and for the multiplexed frame data, SVC strengthens data flow data just can be called the enhancing data.By the data in multiplexed frame data and the corresponding SVC enhancing data flow are decoded, decoder just can produce related data in desirable mode.For example, essential information to video flowing can be placed in the basic service flow data, and the information (for example resolution etc.) that can promote video flow quality is placed into enhancing information, when video flowing is transformed into low broadband network from high broadband, can progressively allow enhancing information " degeneration " according to bandwidth, until to a certain degree, combine with basic business data then and decode, reach a preferable quality; Using FEC to strengthen data flow can protect the data in the multiplexed frame; when having situations such as error code at wireless channel; in application layer significant data is done the FEC protection and form FEC enhancing data flow, can be to the error code correcting data error, recovered part or whole multiplexed frame data.The value-added information of program association information portability CMMB.
Can predict,, can promote the quality of service in the mobile multimedia broadcast system greatly, thereby improve the service quality of mobile multimedia broadcast system if basic service flows is carried out extension process.At present, not at the expansion scheme of basic service flows.
Summary of the invention
In view of this, main purpose of the present invention is to provide professional extended method and device in a kind of mobile multimedia broadcast system, can promote the service quality of broadcast system by the expansion basic service flows.
For achieving the above object, technical scheme of the present invention is achieved in that
Professional extended method in a kind of mobile multimedia broadcast system comprises:
Basic service flows is packaged in the multiplexed frame, strengthens data flow, when sending the multiplexed frame of carrying basic service flows, send described enhancing data flow in the lump for described basic service flows generates.
Preferably, described method also comprises:
Send in the lump with described enhancing data flow, also comprise the supplementary of described enhancing data flow of record and described basic service flows incidence relation.
Preferably, described enhancing data flow is loaded in the multiplexed frame and with described basic service flows and sends; The multiplexed frame that carries described enhancing data flow sent before or after the multiplexed frame of the described basic service flows of carrying.
Preferably, described enhancing data flow sends by the dedicated bearer channel.
Preferably, described supplementary comprises that also carrying strengthens the positional information of data flow, to the statistical information of basic service flows, and basic service flows repeating data, or the position of basic service flows, offset information.
Preferably, strengthen data and comprise video code flow is carried out enhancement data after scalable video coding SVC handles, carry out the redundant data that forward error correction FEC handles, or program association information.
Professional expanding unit in a kind of mobile multimedia broadcast system comprises:
First encapsulation unit is used for basic service flows is packaged in multiplexed frame;
Generation unit is used to described basic service flows to generate and strengthens data flow; And
Transmitting element is used to send the multiplexed frame that carries basic service flows, sends described enhancing data flow in the lump.
Preferably, when described transmitting element sends described enhancing data flow, also send the supplementary of described enhancing data flow of record and described basic service flows incidence relation.
Preferably, described device also comprises:
Second encapsulation unit is used for described enhancing data flow is loaded on multiplexed frame, and the multiplexed frame that wherein carries described enhancing data flow is before or after the multiplexed frame of the described basic service flows of carrying; Described transmitting element sends described enhancing data flow with described basic service flows.
Preferably, strengthen data and comprise video code flow is carried out enhancement data after scalable video coding SVC handles, carry out the redundant data that forward error correction FEC handles, or program association information.
Among the present invention, basic service flows is carried out SVC or FEC processing, generate the corresponding data flow that strengthens, basic service flows still is packaged in the multiplexed frame by the packaged type of former broadcast system, and for strengthening data flow, can adopts the packaged type identical to be encapsulated in the multiplexed frame of broadcast system with basic service flows, perhaps, special channel is set, strengthens data, be sent to receiving terminal by this special channel bearing.For making the receiving terminal enhancing data flow of decoding better, also be provided with supplementary, supplementary has been put down in writing the incidence relation that strengthens between data flow and the basic service flows, basic service flows and strengthen the positional information of data flow in the respective carrier channel etc.The present invention has improved the service quality of basic service in the broadcast system.
Description of drawings
Fig. 1 is the composition structural representation of CMMB channel frame;
Fig. 2 is the flow chart of professional extended method in the mobile multimedia broadcast system of the present invention;
Fig. 3 is the composition structural representation of professional expanding unit in the mobile multimedia broadcast system of the present invention.
Embodiment
Basic thought of the present invention is: basic service flows is carried out SVC or FEC processing, generate the corresponding data flow that strengthens, basic service flows still is packaged in the multiplexed frame by the packaged type of former broadcast system, and for strengthening data flow, can adopt the packaged type identical to be encapsulated in the multiplexed frame of broadcast system, perhaps, special channel is set with basic service flows, strengthen data by this special channel bearing, be sent to receiving terminal.For making the receiving terminal enhancing data flow of decoding better, also be provided with supplementary, supplementary has been put down in writing the incidence relation that strengthens between data flow and the basic service flows, basic service flows and strengthen the positional information of data flow in the respective carrier channel etc.The present invention has improved the service quality of basic service in the broadcast system.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 2 is the flow chart of professional extended method in the mobile multimedia broadcast system of the present invention, and as shown in Figure 2, professional extended method may further comprise the steps in the mobile multimedia broadcast system of the present invention:
Step 201: the multiplexed frame form is pressed in multiplex frame head, multiplexed frame payload and filling formed multiplexed frame.The broadcast system side is the original basic service information (comprising multiplex frame head, multiplexed frame payload) of multiplexed frame and the filling information part as the multiplexed frame data message, is multiplexed frame according to the construction packages of the existing multiplexed frame of broadcast system.
Step 202: the basic service flows in the multiplexed frame is done certain processing, form and strengthen data flow; The related information of record basic service and enhanced flow is as supplemental stream.
The broadcast system side will be described the data of multiplexed frame basic service as strengthening data, be packaged into the enhancing data flow.Strengthening data flow can be by the external interface input, also can be multiplexing equipment from original data stream, generate according to certain rule.For example, the video encode stream in the basic service flows is carried out SVC handle and generate multilayer enhancing data flow, the multilayer that is generated enhancing data flow can be improved the video pictures quality of elementary video stream.Perhaps, basic service flows is carried out FEC handle, generate the redundant data of basic service flows, when mistake appears in basic service flows, utilize FEC to strengthen data and recover, thereby obtain basic service quality preferably.The more important data such as frame head of multiplexed frame of carrying basic service flows are carried out guaranteeing that the probability that this multiplexed frame is correctly decoded improves greatly after FEC handles, and are a kind of protections to multiplexed frame and data thereof.Strengthening data flow also may be the association data of program, the value-added service data relevant as program, as follow the professional information such as captions advertisement that occur.
The FEC algorithm comprises redundant processing modes such as Reed Solomon code (RS, Reed-Solomon Code), Turbo code, low density parity check code (LDPC, Low Density Parity Check Code), Raptor sign indicating number.
Describe the related information of multiplexed frame data and enhancing data flow, generate supplementary.Comprise in the described supplementary and be used for the information that the auxiliary reception terminal determines to strengthen data flow carrying position.Supplementary can further comprise and is used for the positional information that the auxiliary reception end obtains the original basic service flows corresponding with strengthening data flow.Supplementary also can further comprise the additional description information that is used for original basic service flows.If the situation to original basic service flows change easily takes place in bad channel conditions, just should be described original basic service flows, form auxiliary data.Auxiliary data can be original basic service flows Information Statistics, can be the simple repetition of original basic service flows, also can be the information such as the position in source data, side-play amount of original basic service flows information.
The transmission of supplementary is that bandwidth, packet loss, wrong bitrate, noise ratio and the network the present situation according to current channel comprehensively determines, under the relatively poor situation of channel condition, when receiving terminal may not be correctly decoded basic service flows, need carrying to strengthen data flow and supplementary, so that increase the accuracy of receiving terminal to the basic service flows decoding.Strengthening data flow also can be the basic service flows Information Statistics, can be the simple repetition of original basic service flows, also can be the information such as the position in source data, side-play amount of original basic service flows information.
Step 203: the multiplexed frame data are broadcasted in the CMMB system, sent enhancing data flow, supplementary in the lump.
Need to prove, the multiplexed frame Data-carrying be basic business data, basic business data still is packaged in the multiplexed frame of broadcast channel frame by existing packaged type, and send in the multiplexed frame that data flow and supplementary etc. might not be carried on broadcast channel frame for strengthening, can between broadcast system and receiving terminal, set up special transmission channel and transmit this enhancing data flow and supplementary, so that receiving terminal is correctly decoded basic service flows according to strengthening data flow and supplementary, or promote the quality of data of this basic service flows.Certainly, also can be packaged in the multiplexed frame of broadcast channel frame, and in the CMMB system, be broadcast to receiving terminal strengthening data flow and supplementary packaged type by basic service flows.The multiplexed frame of carrying enhancing data flow and supplementary can be before or after carrying basic service flows multiplexed frame, and as long as the carrying positional information is by supplementary notice receiving terminal or prior agreement.
Supplementary is optional beared information, under the situation of channel resource anxiety, can not send supplementary.
Strengthening data flow can be attached to before or after the original basic business data flow data and original basic business data stream, auxiliary flow are done as a wholely to transmit in same broadcast channel; Strengthen data flow and also can be used as the data that flow equal effectiveness with original basic business data, use different channels to transmit respectively.Supplementary can be attached to before or after the original basic business data stream and original basic business data stream is done as a whole in transmission of same broadcast channel; Supplementary also can be used as the data that flow equal effectiveness with original basic business data, uses different channels to transmit respectively.Supplementary can be attached to before or after the enhanced flow and enhanced flow is done as a whole in transmission of same channel; Described enhancing data flow also can be sky.
Step 204: receiving terminal receives the multiplexed frame data, strengthens data flow and supplementary.
Receiving terminal passes through to monitor the multiplexed frame data that receive the basic service of CMMB system broadcasts in the broadcast channel frame, and, by the enhancing data flow and the supplementary of CMMB system broadcasts or dedicated channel monitoring basic service flows.
Step 205: according to supplementary, related multiplexed frame data and strengthen data flow with the multiplexed frame data that are associated with strengthen data flow and handle according to the supplementary correlated identities, form final audio frequency and video and business datum, play and show.
Fig. 3 is the composition structural representation of professional expanding unit in the mobile multimedia broadcast system of the present invention, as shown in Figure 3, professional expanding unit comprises first encapsulation unit 30, generation unit 31 and transmitting element 32 in the mobile multimedia broadcast system of the present invention, wherein, first encapsulation unit 30 is used for basic service flows is packaged in multiplexed frame; Generation unit 31 is used to described basic service flows to generate the enhancing data flow; Transmitting element 32 is used to send the multiplexed frame of carrying basic service flows, sends described enhancing data flow in the lump.When transmitting element 32 sends described enhancing data flow, also send the supplementary of described enhancing data flow of record and described basic service flows incidence relation.
As shown in Figure 3, professional expanding unit also comprises second encapsulation unit 33 in the mobile multimedia broadcast system of the present invention, be used for described enhancing data flow is loaded on multiplexed frame, the multiplexed frame that wherein carries described enhancing data flow is before or after the multiplexed frame of the described basic service flows of carrying; Described transmitting element sends described enhancing data flow with described basic service flows.Strengthen data and comprise video code flow is carried out enhancement data after SVC handles, carry out the redundant data that FEC handles, or program association information.
Those skilled in the art are to be understood that, second encapsulation unit 33 shown in Figure 3 is not necessary parts of realizing professional expanding unit in the mobile multimedia broadcast system of the present invention, and only professional expanding unit is provided with in the mobile multimedia broadcast system of the present invention in order to optimize.
The realization function that it will be appreciated by those skilled in the art that the each processing unit in the professional expanding unit in the mobile multimedia broadcast system shown in Figure 3 can be understood with reference to the associated description in the preceding method.The function of each unit can realize by the program that runs on the processor in the device shown in Figure 3, also can realize by concrete logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. professional extended method in the mobile multimedia broadcast system is characterized in that, comprising:
Basic service flows is packaged in the multiplexed frame, strengthens data flow, when sending the multiplexed frame of carrying basic service flows, send described enhancing data flow in the lump for described basic service flows generates.
2. method according to claim 1 is characterized in that, described method also comprises:
Send in the lump with described enhancing data flow, also comprise the supplementary of described enhancing data flow of record and described basic service flows incidence relation.
3. method according to claim 1 is characterized in that, described enhancing data flow is loaded in the multiplexed frame and with described basic service flows and sends; The multiplexed frame that carries described enhancing data flow sent before or after the multiplexed frame of the described basic service flows of carrying.
4. method according to claim 1 is characterized in that, described enhancing data flow sends by the dedicated bearer channel.
5. method according to claim 2 is characterized in that, described supplementary comprises that also carrying strengthens the positional information of data flow, to the statistical information of basic service flows, and basic service flows repeating data, or the position of basic service flows, offset information.
6. according to each described method in the claim 1 to 5, it is characterized in that, strengthen data and comprise video code flow is carried out enhancement data after scalable video coding SVC handles, carry out the redundant data that forward error correction FEC handles, or program association information.
7. professional expanding unit in the mobile multimedia broadcast system is characterized in that, comprising:
First encapsulation unit is used for basic service flows is packaged in multiplexed frame;
Generation unit is used to described basic service flows to generate and strengthens data flow; And
Transmitting element is used to send the multiplexed frame that carries basic service flows, sends described enhancing data flow in the lump.
8. device according to claim 7 is characterized in that, when described transmitting element sends described enhancing data flow, also sends the supplementary of described enhancing data flow of record and described basic service flows incidence relation.
9. device according to claim 7 is characterized in that, described device also comprises:
Second encapsulation unit is used for described enhancing data flow is loaded on multiplexed frame, and the multiplexed frame that wherein carries described enhancing data flow is before or after the multiplexed frame of the described basic service flows of carrying; Described transmitting element sends described enhancing data flow with described basic service flows.
10. according to each described device in the claim 7 to 9, it is characterized in that, strengthen data and comprise video code flow is carried out enhancement data after scalable video coding SVC handles, carry out the redundant data that forward error correction FEC handles, or program association information.
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| CN1878408A (en) * | 2002-05-03 | 2006-12-13 | 三星电子株式会社 | Apparatus and method for providing service based on multiple data rates in mobile communication system |
| CN101167364A (en) * | 2005-03-10 | 2008-04-23 | 高通股份有限公司 | Scalable video coding with two layer encoding and single layer decoding |
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Application publication date: 20110105 |