CN1866782A - Method for realizing system broadcast multicast service - Google Patents
Method for realizing system broadcast multicast service Download PDFInfo
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- CN1866782A CN1866782A CN 200510070694 CN200510070694A CN1866782A CN 1866782 A CN1866782 A CN 1866782A CN 200510070694 CN200510070694 CN 200510070694 CN 200510070694 A CN200510070694 A CN 200510070694A CN 1866782 A CN1866782 A CN 1866782A
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Abstract
The invention discloses a system broadcast multiple broadcast service realizing method, which comprises the flollwing steps: carrying out multiple bit rate code for undiscovered service information; getting first kind information code flow and second kind information code flow; sending all information code flow; getting first kind information code flow by terminal; realizing broadcast multiple broadcast service; getting second information code flow by terminal; optimizing broadcast multiple broadcast service. The system uses low rate physics channel sending forst kind information code flow to make first kind information code flow cover all subdistricts; the first kind information code flow is madeup by one information code flow; the second information code flow has at least one information code flow; the same information code flow has the same rate of physics channel sending. The invention improves the broadcast service bandwidth of system integral body.
Description
Technical field
The present invention relates to a kind of broadcasting method of multimedia service, especially enhancement mode transmits the multimedia service broadcasting method in code division multiple access (CDMA1XEV-DO) system of data separately.
Background technology
BroadCast MultiCast Service (BCMCS, Broadcast and Multicast Service) is a kind of new business form that can carry out in the CDMA20001X-EVDO system, BCMCS can carry multiple business, for example video flowing, audio stream or other binary data stream.The major technique characteristics of BCMCS are: the broadcast channel of sharing in the system is a radio traffic channel, and BCMCS carries out service broadcast by described radio traffic channel, can provide content identical information for a large number of users simultaneously.
In the CDMA20001X-EVDO system, the available data rate of wireless physical channel is from 38.4kbps, 76.8kbps, 153.6kbps to 2457.6kbps.For the physical channel of different pieces of information speed, there is the relation of inverse ratio between physical channel rate and the signal cover, the coverage effect of high-speed physical channel is relatively poor relatively, and the coverage effect of low speed physical channel is better relatively.Its reason is: the physical channel that data rate is lower, have the higher signal gain, thereby the coverage of channel is bigger; Otherwise, the physical channel that data rate is higher, its signal gain is lower, thereby coverage is less relatively.
With reference to Fig. 1, in the prior art, when the BCMCS sending down service, one road BCMCS business (one road audio frequency or one road video) is encoded to a code stream.Described code stream is: in order to adapt to digital communication system transmission, and the binary data stream that information such as video, audio frequency are formed after specific coding.The corresponding logic channel of the code stream of above-mentioned one road BCMCS business, every logic channel is carried and is issued by at least one physical channel; Simultaneously, many physical channels that carry same logic channel have identical data rate.
By BCMCS sending down service scheme in the prior art as can be known, in order to guarantee the covering quality of each sub-district of wireless network, when carrying out the BCMCS sending down service, the data rate configurating channel that system will can receive with the poorest user of channel condition in the sub-district, issuing service information.Hence one can see that, because the BCMCS business can only be with the channel radio of uniform data speed, and then for the user of giving consideration to channel condition difference, the user that channel condition is good also can only receive the program of same low physical channel rate, can not make full use of good channel condition, cause resource waste.
Summary of the invention
The problem to be solved in the present invention provides a kind of implementation method of system broadcasts multicast service, this method can make full use of the channel condition that system provides, and promptly provides the Multimedia Broadcast Multicast Service of multimass grade according to user's different channels condition for all users in the sub-district.
For solving the problems of the technologies described above, the objective of the invention is be by the following technical programs: treat sending service information and carry out multiple bit rate encoding, obtain the type I information code stream and the second category information code stream; Issue described information code current; Terminal is obtained the type I information code stream, realizes described BroadCast MultiCast Service; Terminal is obtained the second letter class breath code stream, optimizes described BroadCast MultiCast Service.
In such scheme, when carrying out multiple bit rate encoding, should reduce the redundancy of the described type I information code stream and the second category information code stream, for those skilled in the art, can choose the algorithm that reduces redundancy according to the data characteristics of different business, algorithms of different reduces the effect difference of redundancy for the data of different service types, yet the basic skills that reduces the redundancy between information code current is conventionally known to one of skill in the art, does not do further qualification among the present invention.After obtaining described information code current, system issues the type I information code stream by the low-rate physical channel, makes the type I information code stream cover whole sub-district, for example uses speed to be the 409.6kbps physical channel; But the higher physical channel of the described second category information code stream through-rate issues.Described type I information code stream is made of an information code current usually; The described second category information code stream generally includes at least one information code current; And same information code current is issued by the physical channel with phase same rate.
When described when treating that sending service information is vision signal, when the present invention carries out multiple bit rate encoding, can be to the half-tone information coding of vision signal, acquisition can realize the type I information code stream of black and white image; To the chrominance information coding, acquisition can further realize the second category information code stream of coloured image; And, also can further comprise the information that is used to improve grey level or improves image resolution ratio in the described second category information code stream.
Above technical scheme as can be seen, in the present invention, carry out multiple bit rate encoding by treating sending service information, obtain a plurality of information code currents, and issue respectively by the physical channel of different rates, make system terminal obtain described information code current according to channel condition, and according to the BroadCast MultiCast Service of how much realizing different quality of institute's acquired information.
Further, among the present invention, system will treat that sending service information carries out multiple bit rate encoding, obtained to be used to realize the main bit stream of BroadCast MultiCast Service, and at least one is used to improve the side information code stream of this quality of service, described main bit stream is realized basic BroadCast MultiCast Service, and described side information code stream can not be realized this business separately; System issues the physical channel (as: 409.6kbps) of described information code current by low rate, make the essential information coding can cover whole sub-district, the user that channel condition is bad can realize the basic acceptable BroadCast MultiCast Service of user as long as obtain this essential information coding in the sub-district; On the other hand, system issues the physical channel of described side information code stream by higher rate, make channel condition preferably the user can receive this information, and this information of passing through is optimized the BroadCast MultiCast Service of sub-district on the basis of described main bit stream, when terminal obtains the side information code stream, can realize more excellent BroadCast MultiCast Service.
In sum, the present invention provides the BroadCast MultiCast Service of multimass grade according to the different channels condition of terminal, for the terminal of bad channel conditions provides basic service, and can making full use of channel condition, the good terminal of channel condition realizes higher-quality business, therefore, the present invention has improved the broadcasting service bandwidth of entire system under the constant prerequisite of system resource, the user has obtained better average service quality.
Description of drawings
Fig. 1 is the existing BroadCast MultiCast Service schematic diagram of realizing;
Fig. 2 realizes the BroadCast MultiCast Service flow chart for the present invention;
Fig. 3 issues schematic diagram for BroadCast MultiCast Service among the present invention.
Embodiment
In the BCMCS of high pass radio network simulation model, when physical channel rate is 409.6kbps, can guarantee the double-receiver user normal BCMCS of reception business in the overlay area of sub-district more than 90%; When physical channel rate was 1228.8kbps, usually only in the overlay area of sub-district below 10%, the double-receiver user just can normally receive the BCMCS business.This simulation model has better embodied in the CDMA20001X-EVDO system, existing inverse relation between different pieces of information speed physical channel rate and the signal cover, be that high-speed physical channel coverage effect is relatively poor relatively, the coverage effect of low speed physical channel is better relatively.
On the other hand, in the relevant criterion of CDMA20001X-EVDO, the broadcast channel of system is always launched with total power; And business is that the mode with the time-division takies Radio Resource in wave point, and promptly business information sends in the time slot of determining; On this basis, because the physical channel of different rates is provided in the CDMA20001X EVDO system, thereby, when sending the data of same quantity of data, use the physical channel of two-forty to send, with respect to using physical channel to send than low rate, will take still less time slot, promptly the two-forty physical channel will take Radio Resource still less.
System's characteristics according to above-mentioned CDMA20001X EVDO, core concept of the present invention is: will treat that sending service information carries out multiple bit rate encoding, obtain a plurality of information code currents and issue, terminal is obtained information code current according to different channel conditions, and realizes the BroadCast MultiCast Service of different quality.Among the present invention, described multiple bit rate encoding is meant that the different content for the treatment of sending service information encodes respectively, and code rate has nothing in common with each other, and then obtains a plurality of information code currents.
With reference to Fig. 2, be that image information is an example to treat sending service information, better embodiment of the present invention is described.
Step 21: system treats an image information and carries out multiple bit rate encoding, obtain at least two information code currents, and described information code current can be divided into two classes, the type I information code stream is a main bit stream, the second category information code stream is additional code stream, and described supplemental code stream is at least one;
Step 22: described information code current is issued by physical channel, and make described main bit stream can cover whole sub-district;
Step 23: terminal is obtained described information code current, and promptly terminal is obtained described main bit stream at least;
Step 24: terminal is recovered image according to the information code current that is obtained, and promptly terminal is recovered the acceptable substantially dynamic image of user according to described main bit stream, if terminal has also been obtained additional code stream, and then can be according to the flow-optimized dynamic image quality of described supplemental code.
With reference to Fig. 3, specify the better embodiment that BroadCast MultiCast Service among the present invention issues process.
As shown in Figure 3, in the present embodiment, the BCMCS business is carried out multiple bit rate encoding (MBR), acquired information code stream 1 and information code current 2.Wherein, described information code current 1 is a main bit stream, is the main bit stream of realizing the system broadcasts multicast service.With the vision signal is example, terminal is if only receive main bit stream, be that the user can accept then according to image quality in images that main bit stream obtains, for example, may include only the monochrome image information that contains half-tone information in this main bit stream, even has lower resolution, less grey level or number of colours according to the image information that main bit stream is realized.Described information code current 2 is for replenishing code stream, and information redundance is less between itself and the main bit stream, and terminal only receives replenishes code stream and can't realize BroadCast MultiCast Service, promptly replenishes code stream and only is used to described main bit stream to provide information to replenish.With the vision signal is example, additional code stream may comprise chrominance information, or the information in the additional code stream can provide higher grey level or resolution, promptly in the image basis that realizes according to main bit stream, can improve resolution, grey level or the color rank etc. of original image according to additional code stream.
As shown in Figure 3, information code current 1 takies logic channel 1, and information code current 2 takies logic channel 2; When flowing to that information code is popular to issue, logic channel 1 is mapped on the relatively low physical channel of speed, as logic channel 1 being mapped to the physical channel that speed is 409.6kbps, because this physical channel rate is lower, thereby make information code current 1 can cover whole sub-district, and then make that all terminals all can receive this code stream information in the sub-district; As shown in the figure, logic channel 2 is mapped on other physical channels, this channel should have higher channel speed with respect to the physical channel that logic channel 1 is shone upon, physical channel as 921.6kbps, by above-mentioned CDMA20001X EVDO system performance as can be known, information code current 2 is not to cover whole sub-district, thus make channel condition preferably terminal can receive described information code current 2.
As shown in Figure 3, logic channel 1 and logic channel 2 are mapped in a plurality of physical channels respectively, and a plurality of physical channel rate that logic channel 1 is shone upon are identical; In like manner, a plurality of physical channel rate that logic channel 2 is shone upon are identical, do not get rid of among the present invention the unique situation of determining physical channel that is mapped to of the logic channel of determining.In the foregoing description, the physical channel rate that issues information code current 1 is 409.6kbps, and the described physical channel rate that issues information code current 2 is 921.6kbps.As is known to the person skilled in the art, speed can be provided is the physical channel of 38.4kbps, 76.8kbps to 2457.6kbps in CDMA20001X EVDO system.Among the present invention, described information code current 1 (main information code current) issues by the physical channel of low rate, its objective is that all terminals that make in the sub-district can both receive information code current 1 (main information code current), yet, the physical channel that issues should have great speed can be decided according to the concrete situation of sub-district or system, need not among the present invention to limit.
In the foregoing description, described information code current 2 promptly among this embodiment, except that main bit stream (information code current 1), includes only an additional code stream for replenishing code stream.Yet those skilled in the art can carry out in the multiple bit rate encoding process the BCMCS business when realization is of the present invention, obtain a plurality of additional code streams, require equally when carrying out multiple bit rate encoding, make to replenish between the code stream to have less redundancy.
Described additional code stream never provides side information with the aspect for main bit stream, for example: can comprise chrominance information respectively in a plurality of additional code streams, be used to improve the information of image resolution ratio and the information of raising tonal gradation etc.Simultaneously, a plurality of supplemental code flow points do not issue by the physical channel of different rates, promptly according to concrete business demand, for replenishing in the code stream to realizing information code current that BroadCast MultiCast Service is important relatively or the information code current of obvious effect being arranged for improving described quality of service, should issue by the lower physical channel of relative speed, but the speed of this physical channel should be greater than the described physical channel rate that is used to issue main bit stream; Can issue by the physical channel of higher rate for other information code currents.This method makes the good terminal of channel condition in the sub-district obtain the more code stream that replenishes, the bad relatively terminal of channel condition obtains less additional code stream, thereby cell system can provide the BroadCast MultiCast Service of multi-service credit rating according to the quality of channel condition for the different terminals user.
Above to treat that sending service is that the embodiment of image information describes the present invention.Because the difference of BroadCast MultiCast Service, should be encoded to main bit stream for which kind of information in the BroadCast MultiCast Service, the present invention does not do qualification, therefore, those skilled in the art can determine to realize the gross standard of described BroadCast MultiCast Service according to the actual demand of system.For example, if treat that sending service is a voice messaging, then the quality of the voice that recover by main bit stream can allow user's discrimination voice content get final product, and additional code stream can further provide higher error correction and except that making an uproar ability, make speech more clear.
More than the implementation method of system broadcasts multicast service provided by the present invention is 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, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1, a kind of system broadcasts multicast service implementation method is characterized in that:
1) treats sending service information and carry out multiple bit rate encoding, obtain the type I information code stream and the second category information code stream;
2) issue described information code current;
3) terminal is obtained the type I information code stream, realizes described BroadCast MultiCast Service; Terminal is obtained the second category information code stream, optimizes described BroadCast MultiCast Service.
2, the system as claimed in claim 1 BroadCast MultiCast Service implementation method is characterized in that step 2) be specially: system issues the type I information code stream by the low-rate physical channel, makes the type I information code stream cover whole sub-district.
3, system broadcasts multicast service implementation method as claimed in claim 2, it is characterized in that: described low speed physical channel rate is 409.6kbps.
4, the system as claimed in claim 1 BroadCast MultiCast Service implementation method is characterized in that:
In the step 1), reduce the redundancy of the described type I information code stream and the second category information code stream when carrying out multiple bit rate encoding.
5, the system as claimed in claim 1 BroadCast MultiCast Service implementation method is characterized in that:
Described type I information code stream is made of an information code current.
6, the system as claimed in claim 1 BroadCast MultiCast Service implementation method is characterized in that:
The described second category information code stream comprises at least one information code current.
7, as one of them described system broadcasts multicast service implementation method of claim 1 to 6, it is characterized in that:
Same information code current is issued by the physical channel with phase same rate.
8, the system as claimed in claim 1 BroadCast MultiCast Service implementation method is characterized in that:
The described sending service information for the treatment of is vision signal;
To the half-tone information coding of vision signal, acquisition can realize the type I information code stream of black and white image in the step 1); To the chrominance information coding, acquisition can further realize the second category information code stream of coloured image.
9, system broadcasts multicast service implementation method as claimed in claim 8 is characterized in that:
Further comprise the information that is used to improve grey level or improves image resolution ratio in the described second category information code stream.
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| CN 200510070694 CN1866782A (en) | 2005-05-18 | 2005-05-18 | Method for realizing system broadcast multicast service |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009000208A1 (en) * | 2007-06-27 | 2008-12-31 | Huawei Technologies Co., Ltd. | Multicast service information transmission method, multicast service implement method, base station, relay station, and terminal |
| CN100583775C (en) * | 2006-12-21 | 2010-01-20 | 中兴通讯股份有限公司 | Method of configuring broadcast multicast system channel and broadcasting program stream |
| CN101414953B (en) * | 2007-10-19 | 2011-05-04 | 上海华为技术有限公司 | Method, base station, relay station and terminal for sending relay system data |
| CN106341210A (en) * | 2015-07-13 | 2017-01-18 | 普天信息技术有限公司 | Multicast service resource allocation method and system |
-
2005
- 2005-05-18 CN CN 200510070694 patent/CN1866782A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100583775C (en) * | 2006-12-21 | 2010-01-20 | 中兴通讯股份有限公司 | Method of configuring broadcast multicast system channel and broadcasting program stream |
| WO2009000208A1 (en) * | 2007-06-27 | 2008-12-31 | Huawei Technologies Co., Ltd. | Multicast service information transmission method, multicast service implement method, base station, relay station, and terminal |
| CN101414953B (en) * | 2007-10-19 | 2011-05-04 | 上海华为技术有限公司 | Method, base station, relay station and terminal for sending relay system data |
| CN106341210A (en) * | 2015-07-13 | 2017-01-18 | 普天信息技术有限公司 | Multicast service resource allocation method and system |
| CN106341210B (en) * | 2015-07-13 | 2019-07-23 | 普天信息技术有限公司 | The resource allocation methods and system of multicast service |
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