CN101478360A - Multi-service multiplexing method and apparatus in mobile multimedia broadcast system - Google Patents
Multi-service multiplexing method and apparatus in mobile multimedia broadcast system Download PDFInfo
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- CN101478360A CN101478360A CNA2008102399133A CN200810239913A CN101478360A CN 101478360 A CN101478360 A CN 101478360A CN A2008102399133 A CNA2008102399133 A CN A2008102399133A CN 200810239913 A CN200810239913 A CN 200810239913A CN 101478360 A CN101478360 A CN 101478360A
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Abstract
The invention discloses a multi-service multiplexing method for a China mobile multi-media broadcasting (CMMB) system. The method comprises the following steps: with regard to multiplexing frames allocated with only one path of real-time service, multiplexing the transmitted data of the real-time service in the current multiplexing frame; and determining the residual capacity of the current multiplexing frame according to the length of the multiplexing frame header and the data volume of the real-time service used by the multiplexing frame, and multiplexing the transmitted data of one path of non-real-time service in the current multiplexing frame by use of the residual capacity. The invention also discloses a multi-service multiplexing device for a CMMB system. The multi-service multiplexing method and the multi-service multiplexing device can increase the utilization rate of channel resources and allow the multiple services to share the multiplexing frame bandwidth.
Description
Technical field
The present invention relates to the multiplex technique in the communication system, multi-business multiplexing method and device in particularly a kind of mobile multimedia broadcast system.
Background technology
Along with the continuous development of mobile communication technology, China mobile multi-media broadcasting technology also becomes the research focus, multiple concrete Mobile Multimedia Broadcasting standard occurred, for example Chinese multimedia broadcasting (CMMB).In mobile multimedia broadcast system, can adopt the service integration technology.For example, CMMB is that form with multiplexed frame exists at multiplex layer, and Fig. 1 is the structure chart of multiplexed frame, comprises that multiplex frame head, multiplexed frame payload and filling bit constitute.Wherein, multiplex frame head is systematic bits such as some multiplexed frame signs, the multiplexed frame payload can comprise a plurality of multiplexed sub frames, wherein carry concrete payload user data, after all payload user data all are carried at the multiplexed frame payload, when the multiplex layer bandwidth still has residue, utilize filling bit to fill at the multiplexed frame end.
The bandwidth of multiplex layer is the timeslot number of being set by physical layer, adjustment mode, the common decision of RS code check and LDPC code check.When the parameter value of setting when physical layer was constant, the bandwidth of multiplex layer (A KBps) had also just immobilized.Multiplexed frame of multiplex layer regulation per second transmission, then the maximum length of multiplexed frame is AKbytes and has also just remained unchanged.
Fig. 2 is the structural representation of multiplexed frame payload.As previously mentioned, the multiplexed frame payload can comprise a plurality of multiplexed sub frames, and a multiplexed sub frame is corresponding to a business, and promptly a multiplexed frame comprises the data that encapsulate in a plurality of professional a second, and a plurality of business are shared the bandwidth A of this multiplexed frame.The multiplexed sub frame corresponding service mainly comprises television broadcasting, sound radio and data broadcasting etc.These professional forms are different, and the Qos demand is also different, and for example, real time business such as TV and sound radio are more harsh to the requirement of time delay, and the such data service of similar file broadcasting is loose relatively to the requirement of time delay.Most of in addition business all have time variation, both real-time change during its service rate.For example, for television broadcasting, when the picture scene changed greatly, it is big that its momentary rate also can become.
At present, in reality operation, multiplexed frame include only a multiplexed sub frame both a multiplexed frame only comprise a business.So this business exclusively enjoys the bandwidth A of this multiplexed frame.Because service rate changes, its average traffic speed is necessarily less than A.And the bandwidth of multiplexed frame also has a lot of affluences under most of situation, and channel resource is not fully utilized.Multiplexing a plurality of when professional for a following multiplexed frame, how a plurality of business share multiplexed frame bandwidth A not have the application and the method for being correlated with yet.
Summary of the invention
In view of this, the invention provides multi-business multiplexing method and device in a kind of mobile multimedia broadcast system, can improve the channel resource utilance, realize that a plurality of business share the multiplexed frame bandwidth.
For achieving the above object, the present invention adopts following technical scheme:
Multi-business multiplexing method in a kind of mobile multimedia broadcast system comprises:
For the multiplexed frame that only disposes one road real time business, the data to be transferred of multiplexing described real time business in current multiplexed frame;
According to the data volume of the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame, determine the residual capacity of current multiplexed frame, utilize the data to be transferred of described residual capacity multiplexing pre-configured road non-real-time service in current multiplexed frame.
Preferably, describedly determine that the residual capacity of current multiplexed frame is: from the total length of current multiplexed frame, deduct the multiplexed sub frame data volume of the described real time business of the length of multiplex frame head and the carrying of current multiplexed frame, with the difference that obtains residual capacity as current multiplexed frame.
Preferably, the described data to be transferred of residual capacity multiplexing pre-configured road non-real-time service in current multiplexed frame that utilizes comprises: if the current data to be transferred amount of selected non-real-time service is greater than described residual capacity, the data volume of the described non-real-time service that carries in the then current multiplexed frame equals described residual capacity, the data to be transferred buffer memory that is not re-used to next frame carries out dispatching multiplex, if the data to be transferred amount of selected non-real-time service is less than or equal to described residual capacity, then current multiplexed frame carries all data to be transferred of described non-real-time service, and utilizes filling bit to fill the remaining bandwidth of current multiplexed frame.
Preferably, the mean data rate of pre-configured non-real-time service is less than the remaining bandwidth of multiplexed frame, and wherein, the remaining bandwidth of described multiplexed frame is that the multiplexed frame total bandwidth deducts the mean data rate and the multiplex frame head overhead of described real time business.
The device of multi-business multiplexing in a kind of mobile multimedia broadcast system comprises: real time business queue unit, non-real-time service queue unit and Multiplexing Unit;
Described real time business queue unit is used to save as the data to be transferred of one road real time business of multiplexed frame configuration;
The non-real-time service queue unit is used to preserve the data to be transferred of non-real-time service;
Multiplexing Unit, be used for the data to be transferred preserved in the multiplexing described real time business queue unit of current multiplexed frame, multiplexed sub frame data volume according to the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame, determine the residual capacity of current multiplexed frame, and utilize described residual capacity data to be transferred in the multiplexing non-real-time service queue unit in current multiplexed frame.
Preferably, described Multiplexing Unit comprises the multiplexing subelement of real time business, residual capacity computation subunit and the multiplexing subelement of non-real-time service,
The multiplexing subelement of described real time business is used for the data to be transferred preserved in the multiplexing described real time business queue unit of current multiplexed frame, and multiplexing data volume is sent to described residual capacity computation subunit;
Described residual capacity computation subunit, be used to receive the data volume that the multiplexing subelement of described real time business sends, and determine the residual capacity of current multiplexed frame, and send to the multiplexing subelement of described non-real-time service according to the data volume of the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame;
The multiplexing subelement of described non-real-time service is used for according to the residual capacity that receives, and it is multiplexing in current multiplexed frame to choose data to be transferred from described non-real-time service queue unit.
Preferably, described residual capacity computation subunit, be used for when determining the residual capacity of current multiplexed frame, from the total length of current multiplexed frame, deduct the multiplexed sub frame data volume of the described real time business of the length of multiplex frame head and current multiplexed frame carrying, with the difference that obtains residual capacity as current multiplexed frame.
Preferably, the multiplexing subelement of described non-real-time service, in current multiplexed frame during multiplexing non-real-time service, if the data to be transferred amount that described non-real-time service formation is preserved is greater than described residual capacity, the data volume of the described non-real-time service that carries in the then current multiplexed frame equals described residual capacity, the data to be transferred buffer memory that is not re-used to next frame carries out dispatching multiplex, if the data to be transferred amount that described non-real-time service formation is preserved is less than or equal to described residual capacity, then current multiplexed frame carries all data to be transferred that described non-real-time service formation is preserved, and utilizes filling bit to fill the remaining bandwidth of current multiplexed frame.
Preferably, this device further comprises the non-real-time service dispensing unit, be used to select the non-real-time service of mean data rate less than the remaining bandwidth of multiplexed frame, the data to be transferred of the non-real-time service of this selection is kept in the described non-real-time service formation, the remaining bandwidth of described multiplexed frame is that the multiplexed frame total bandwidth deducts the mean data rate and the multiplex frame head overhead of described real time business.
As seen from the above technical solution, among the present invention, for the multiplexed frame that only disposes one road real time business, all data to be transferred of multiplexing described real time business in current multiplexed frame; According to the multiplexed sub frame data volume of the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame, determine the residual capacity of current multiplexed frame, utilize the data to be transferred of described residual capacity multiplexing one road non-real-time service in current multiplexed frame.Like this, in the time of can having residual capacity at the multiplexed frame of framing one road real time business, utilize this residual capacity framing non-real-time service, thereby improve the channel resource utilance, realize that a plurality of business share the multiplexed frame bandwidth.
Description of drawings
Fig. 1 is the structural representation of multiplexed frame in the CMMB system.
Fig. 2 is the structural representation of multiplexed frame payload in the CMMB system.
Fig. 3 is the particular flow sheet of multi-business multiplexing method in the mobile multimedia broadcast system of the present invention.
Fig. 4 is the concrete structure figure of multi-service multiplexing device in the mobile multimedia broadcast system of the present invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: in fixed allocation is given real-time service bandwidth, because real time business can not utilize the bandwidth of being distributed fully, utilize bandwidth more than needed to remove the transmission of one line non-real-time service.
Have multiplely for the situation of service integration, for example, the multichannel real time business is transmitted in a multiplexed frame, perhaps, one road real time business and other non-real-time services are transmitted in a multiplexed frame etc.For present system, the configuration of multiplexed frame bandwidth is normally carried out according to the peak rate of one road live signal, that is to say real time business such as transmission of one line audio frequency and video in the multiplexed frame.Service multiplexing method among the present invention is used at this class and is carried out.System only disposes one road real time business for each multiplexed frame in advance.
Fig. 3 is the particular flow sheet of multi-business multiplexing method in the mobile multimedia broadcast system among the present invention.This idiographic flow is that example describes with the CMMB system.As shown in Figure 3, this method comprises:
In the CMMB system, be to carry out framing the cycle one time with 1 second.Usually, for multiplexed frame disposes one road real time business, for example look audio service etc. in real time.Therefore, when the multiplex layer bandwidth was A kBps, each multiplexed frame was A kBytes.Among the present invention, when organizing current multiplexed frame, at first system is inserted in the multiplexed frame for the data to be transferred of one road real time business of this multiplexed frame configuration.
When specific implementation, the data to be transferred of real time business can be formed formation, when organizing multiplexed frame, directly from formation, take out data to be transferred then, form a multiplexed sub frame, multiplexing in current multiplexed frame.The length of supposing this multiplexed sub frame of formation is B kBytes.
As previously mentioned, the structure of multiplexed frame comprises: multiplex frame head, multiplexing payload and optional filling bit.Therefore, can calculate the residual capacity of current multiplexed frame according to the data volume of real time business multiplexing in the step 301 and the length of multiplex frame head.Particularly, from the total length of current multiplexed frame, deduct the multiplexed sub frame data volume of the described real time business of the length of multiplex frame head and current multiplexed frame carrying, with the difference that obtains residual capacity as current multiplexed frame.If the frame head length of multiplexed frame is D, then the residual capacity C=A-B-D of current multiplexed frame.
When residual capacity is 0, then represent current multiplexed frame full, can not carry other data again, it can be sent into the upper strata processing and send.When residual capacity is not 0, then represent current multiplexed frame still can carry other data, change step 303 over to and carry out the multiplexing of other non-real-time services.
Wherein, the pre-configured a kind of non-real-time service of system, data that can multiplexing this non-real-time service when there is residual capacity in multiplexed frame are to improve bandwidth availability ratio.In actual applications, non-real-time service has a plurality of, select in advance mode that one of them non-real-time service is configured can for: the total bandwidth of multiplexed frame deducts the Mean Speed of real time business, deduct the overhead of multiplex frame head again, with the difference result that obtains remaining bandwidth as multiplexed frame, select Mean Speed less than and the non-real-time service of the most approaching remaining bandwidth that calculates.
In this step, with the Data-carrying of pre-configured non-real-time service in current multiplexed frame.
If not the data to be transferred amount of real time business is greater than the residual capacity of current multiplexed frame, the data of then choosing in the data to be transferred of non-real-time service with residual capacity equivalent form multiplexed sub frame, multiplexing in current multiplexed frame, carry in the promptly current multiplexed frame the data volume of multiplexing non-real-time service equal residual capacity; If not the data to be transferred amount of real time business is less than or equal to the residual capacity of current multiplexed frame, then all data to be transferred with non-real-time service form multiplexed sub frame, multiplexing in current multiplexed frame, and utilizing filling bit to fill the remaining bandwidth of current multiplexed frame, promptly current multiplexed frame carries all data to be transferred of selected non-real-time service.
During specific implementation, can corresponding queues be set, preserve the data to be transferred of this non-real-time service for non-real-time service.In this step the data to be transferred in this non-real-time service formation is selected part or all of formation multiplexed sub frame.
So far, current multiplexed frame is just organized and is finished, and the multiplex layer of present frame is handled and also just finished, and can carry out other upper stratas and handle and send.By above-mentioned processing, promptly can be implemented in the multiplexed frame channel of transmission of one line real time business, extra multiplexing one road non-real-time service when having residual capacity, thus reach the purpose that improves the channel resource utilance.
The above-mentioned embodiment that is multi-business multiplexing method among the present invention.The present invention also provides a kind of multi-service multiplexing device, can be used for implementing the present invention's multi-business multiplexing method, and Fig. 4 is the concrete structure figure of this device.As shown in Figure 4, this device comprises real time business queue unit, non-real-time service queue unit and Multiplexing Unit.
In this device, the real time business queue unit is used to save as the data to be transferred of one road real time business of multiplexed frame configuration.
The non-real-time service queue unit is used to preserve the data to be transferred of non-real-time service.
Multiplexing Unit, be used for the data to be transferred preserved in the multiplexing described real time business queue unit of current multiplexed frame, multiplexed sub frame data volume according to the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame, determine the residual capacity of current multiplexed frame, and utilize described residual capacity data to be transferred in the multiplexing non-real-time service queue unit in current multiplexed frame.
When specific implementation, Multiplexing Unit can comprise the multiplexing subelement of real time business, residual capacity computation subunit and the multiplexing subelement of non-real-time service.
Wherein, the multiplexing subelement of real time business is used for the data to be transferred preserved in the multiplexing real time business queue unit of current multiplexed frame, and multiplexing data volume is sent to the residual capacity computation subunit.
The residual capacity computation subunit, be used to receive the data volume that the multiplexing subelement of real time business sends, according to the data volume of the multiplexing real time business of the length of multiplex frame head and current multiplexed frame, determine the residual capacity of current multiplexed frame, and send to the multiplexing subelement of non-real-time service; Particularly, when determining the residual capacity of current multiplexed frame, the residual capacity computation subunit can deduct the multiplexed sub frame data volume of the described real time business of the length of multiplex frame head and the carrying of current multiplexed frame from the total length of current multiplexed frame, with the difference that the obtains residual capacity as current multiplexed frame.
The multiplexing subelement of non-real-time service is used for according to the residual capacity that receives, and it is multiplexing in current multiplexed frame to choose data to be transferred from the non-real-time service queue unit.Specifically when choosing data to be transferred, if not the data to be transferred amount that the real time business formation is preserved is greater than the residual capacity that receives, then the data volume of the described non-real-time service that carries in current multiplexed frame equals described residual capacity, the data to be transferred buffer memory that is not re-used to next frame carries out dispatching multiplex, if the data to be transferred amount that described non-real-time service formation is preserved is less than or equal to described residual capacity, then current multiplexed frame carries all data to be transferred that described non-real-time service formation is preserved, and utilizes filling bit to fill the remaining bandwidth of current multiplexed frame.
Further, as previously mentioned, can be in advance in a plurality of non-real-time services, select a kind of being configured, thus when there is residual capacity in current multiplexed frame multiplexing this non-real-time service.For achieving the above object, device of the present invention can further include the non-real-time service dispensing unit, be used to select the non-real-time service of mean data rate less than the remaining bandwidth of multiplexed frame, the data to be transferred of the non-real-time service of this selection is kept in the described non-real-time service formation, wherein, the remaining bandwidth of multiplexed frame is that the multiplexed frame total bandwidth deducts the mean data rate and the multiplex frame head overhead of described real time business.
In the implementation procedure of the invention described above, real time business and non-real-time service are according to business the requirement of time-delay to be distinguished.Concrete real time business and non-real-time service can have multiple, and for example, real time business can be one road television program, and non-real-time service can be the data services such as weather forecast of circulating content.Above-mentioned real time business and non-real-time service are carried out multiplexing, when promptly can be implemented in real time business and play, play non-real-time service, for example in terminal plays one tunnel TV programme, can circulate shows weather forecast, traffic information etc.
By as seen above-mentioned, multi-business multiplexing method and device in the CMMB provided by the invention system, big by the binding data rate variation, to time-delay relatively more responsive look audio service in real time and data rate is adjustable, to insensitive non-real-time service of delaying time, thereby channel resource is utilized fully, improve the channel resource utilance, realize that a plurality of business share the multiplexed frame bandwidth.For operator, obtain more income thereby can utilize the present invention in Limited resources, to carry out more value-added services.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, the multi-business multiplexing method in a kind of mobile multimedia broadcast system is characterized in that, this method comprises:
For the multiplexed frame that only disposes one road real time business, the data to be transferred of multiplexing described real time business in current multiplexed frame;
According to the data volume of the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame, determine the residual capacity of current multiplexed frame, utilize the data to be transferred of described residual capacity multiplexing pre-configured road non-real-time service in current multiplexed frame.
2, method according to claim 1, it is characterized in that, describedly determine that the residual capacity of current multiplexed frame is: from the total length of current multiplexed frame, deduct the multiplexed sub frame data volume of the described real time business of the length of multiplex frame head and the carrying of current multiplexed frame, with the difference that obtains residual capacity as current multiplexed frame.
3, method according to claim 1, it is characterized in that, the described data to be transferred of residual capacity multiplexing pre-configured road non-real-time service in current multiplexed frame that utilizes comprises: if the current data to be transferred amount of selected non-real-time service is greater than described residual capacity, the data volume of the described non-real-time service that carries in the then current multiplexed frame equals described residual capacity, the data to be transferred buffer memory that is not re-used to next frame carries out dispatching multiplex, if the data to be transferred amount of selected non-real-time service is less than or equal to described residual capacity, then current multiplexed frame carries all data to be transferred of described non-real-time service, and utilizes filling bit to fill the remaining bandwidth of current multiplexed frame.
4, according to arbitrary described method in the claim 1 to 3, it is characterized in that, the mean data rate of pre-configured non-real-time service is less than the remaining bandwidth of multiplexed frame, wherein, the remaining bandwidth of described multiplexed frame is that the multiplexed frame total bandwidth deducts the mean data rate and the multiplex frame head overhead of described real time business.
5, the device of multi-business multiplexing in a kind of mobile multimedia broadcast system is characterized in that this device comprises: real time business queue unit, non-real-time service queue unit and Multiplexing Unit;
Described real time business queue unit is used to save as the data to be transferred of one road real time business of multiplexed frame configuration;
The non-real-time service queue unit is used to preserve the data to be transferred of non-real-time service;
Multiplexing Unit, be used for the data to be transferred preserved in the multiplexing described real time business queue unit of current multiplexed frame, multiplexed sub frame data volume according to the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame, determine the residual capacity of current multiplexed frame, and utilize described residual capacity data to be transferred in the multiplexing non-real-time service queue unit in current multiplexed frame.
6, device according to claim 5 is characterized in that, described Multiplexing Unit comprises the multiplexing subelement of real time business, residual capacity computation subunit and the multiplexing subelement of non-real-time service,
The multiplexing subelement of described real time business is used for the data to be transferred preserved in the multiplexing described real time business queue unit of current multiplexed frame, and multiplexing data volume is sent to described residual capacity computation subunit;
Described residual capacity computation subunit, be used to receive the data volume that the multiplexing subelement of described real time business sends, and determine the residual capacity of current multiplexed frame, and send to the multiplexing subelement of described non-real-time service according to the data volume of the multiplexing described real time business of the length of multiplex frame head and current multiplexed frame;
The multiplexing subelement of described non-real-time service is used for according to the residual capacity that receives, and it is multiplexing in current multiplexed frame to choose data to be transferred from described non-real-time service queue unit.
7, device according to claim 6, it is characterized in that, described residual capacity computation subunit, be used for when determining the residual capacity of current multiplexed frame, from the total length of current multiplexed frame, deduct the multiplexed sub frame data volume of the described real time business of the length of multiplex frame head and current multiplexed frame carrying, with the difference that obtains residual capacity as current multiplexed frame.
8, according to claim 6 or 7 described devices, it is characterized in that, the multiplexing subelement of described non-real-time service, in current multiplexed frame during multiplexing non-real-time service, if the data to be transferred amount that described non-real-time service formation is preserved is greater than described residual capacity, the data volume of the described non-real-time service that carries in the then current multiplexed frame equals described residual capacity, the data to be transferred buffer memory that is not re-used to next frame carries out dispatching multiplex, if the data to be transferred amount that described non-real-time service formation is preserved is less than or equal to described residual capacity, then current multiplexed frame carries all data to be transferred that described non-real-time service formation is preserved, and utilizes filling bit to fill the remaining bandwidth of current multiplexed frame.
9, according to arbitrary described device in the claim 5 to 7, it is characterized in that, this device further comprises the non-real-time service dispensing unit, be used to select the non-real-time service of mean data rate less than the remaining bandwidth of multiplexed frame, the data to be transferred of the non-real-time service of this selection is kept in the described non-real-time service formation, the remaining bandwidth of described multiplexed frame is that the multiplexed frame total bandwidth deducts the mean data rate and the multiplex frame head overhead of described real time business.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980532A (en) * | 2010-10-26 | 2011-02-23 | 中兴通讯股份有限公司 | Cmmb multiplexing method and device |
| CN109981162A (en) * | 2019-03-27 | 2019-07-05 | 北京空间飞行器总体设计部 | Data processing and Transmission system suitable for inertial space pointing space astronomical satellite |
| CN114745273A (en) * | 2022-06-10 | 2022-07-12 | 成都星联芯通科技有限公司 | TCP acceleration proxy method, device, satellite ground station and readable storage medium |
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2008
- 2008-12-12 CN CNA2008102399133A patent/CN101478360A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980532A (en) * | 2010-10-26 | 2011-02-23 | 中兴通讯股份有限公司 | Cmmb multiplexing method and device |
| WO2012055227A1 (en) * | 2010-10-26 | 2012-05-03 | 中兴通讯股份有限公司 | Method and device for china mobile multimedia broadcast (cmmb) multiplexing |
| CN109981162A (en) * | 2019-03-27 | 2019-07-05 | 北京空间飞行器总体设计部 | Data processing and Transmission system suitable for inertial space pointing space astronomical satellite |
| CN109981162B (en) * | 2019-03-27 | 2022-03-04 | 北京空间飞行器总体设计部 | Data processing and transmission system suitable for inertial space pointing space astronomical satellite |
| CN114745273A (en) * | 2022-06-10 | 2022-07-12 | 成都星联芯通科技有限公司 | TCP acceleration proxy method, device, satellite ground station and readable storage medium |
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Application publication date: 20090708 |