CN102761405B - A kind of logic channel collocation method for China Mobile multimedia broadcasting system - Google Patents
A kind of logic channel collocation method for China Mobile multimedia broadcasting system Download PDFInfo
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Abstract
The present invention relates to a kind of logic channel collocation method for China Mobile multimedia broadcasting system, comprising: step 1, in transmission frame, reserved continuous print time slot is as a dynamic-configuration district; Step 2, for each dynamic-configuration district, arranges a business Automatic Configuration Server; Step 3, arranges the parameter described business Automatic Configuration Server needing store; Step 4, described business Automatic Configuration Server, according to the parameter of described storage, produces corresponding multiplexing configuration order or configuration file, and sends to multiplexing equipment, realize logic channel and automatically configure.The present invention realizes the automatic configuration of service logical channels by arranging a business Automatic Configuration Server, this collocation method simplifies the layoutprocedure of the logic channel of business, facilitate the support to short time service, provide the ability of timing automatic service switchover, remain the compatibility with existing configuration mode.
Description
Technical field
The present invention relates to digital information transmission technical field, particularly a kind of for China Mobile multimedia broadcasting, the method that can be the automatic configuration logic channel of business.
Background technology
China Mobile multimedia broadcasting (ChinaMobileMultimediaBroadcasting, CMMB) is the digit broadcasting system of first set towards mobile phone, PDA, MP3, MP4, digital camera, the multiple mobile terminal of notebook computer of domestic independent research.This system utilizes satellite and the broadcast of ground U wave band, omnidistance seamless coverage can be realized, support whole nation roaming and unified operation, and polytype multimedia services such as digital broadcast television, urgent broadcast service, integrated information propelling movement are provided, for government, enterprises and individuals provide information service, there is great commercial value and social benefit.
In order to support the transmission of multiple business in same broadcast channel, CMMB introduces the concept of logic channel to realize the multiplexing of multiple business.Here logic channel comprises two kinds: multiplexed frame and multiplexed sub frame.The corresponding multiplexed sub frame of each business, each multiplexed sub frame comprises again video-frequency band, audio section and data segment, respectively to should the video flowing of business, audio stream and data flow; Multiplexed frame is then made up of one or more multiplexed sub frames, the integer time slot in busy channel transmission frame, and adopts same set of physical level coded modulation parameter.
Based on above-mentioned multiplexing mechanism, when business being changed in CMMB channel, all relate to the parameter configuration to its logic channel at every turn.Such as, often increase a new business, need first to determine the multiplexed frame shared by this business, and be configured this multiplexed frame, configuration parameter comprises multiplexed frame ID, RS code check, LDPC code rate, interleaving mode, modulation system, scrambler mode, takies time slot; Then, also need to be configured multiplexed sub frame, configuration parameter comprises the multiplexed frame, type of service, encapsulation mode, service bandwidth etc. at multiplexed sub frame ID, traffic ID, business place; Also need to be configured the parameter of each video flowing of multiplexed sub frame, audio stream and data flow further.
At present, the configuration of above-mentioned logic channel is all configured by webmaster is manual, and this brings the problem of several aspect.First, manual configuration process is comparatively loaded down with trivial details, not easily checks after makeing mistakes; Secondly, the short time service supporting to need dynamically change is not easy to.CMMB supports two kinds of business, and one is continuous business, and as audio-video-frequency broadcast channel, business continues the long period, and in units of the moon, year, another kind is short time service, the business duration by time, in units of minute, second.If support short time service, may need to change multiplexing equipment configuration frequently, mode is by hand obvious and improper; Finally, cannot carry out service switchover according to plan, such as, when unattended operation (such as night or vacation), service switchover, the method configured by hand obviously cannot realize.Therefore, we need a kind of method automatically can carrying out logic channel configuration.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of for CMMB system, the method that automatically can carry out logic channel configuration, for solving in prior art the problem needing manual configuration logic channel.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of logic channel collocation method for China Mobile multimedia broadcasting system, comprises the following steps:
Step 1: reserved continuous print time slot is as a dynamic-configuration district in transmission frame.
In order to realize the automatic configuration of service logical channels, first need to be automatic configure reserved time slot from transmission frame.The transmission frame of CMMB is made up of 40 time slots (TS0 – TS39), and wherein time slot 0 is used for control information transmission as control channel, and time slot 1 is used for transport service information to time slot 39 as Traffic Channel.In order to ensure the compatibility with existing configuration mode, a continuous quantity time slot from starting time slots can be reserved as a dynamic-configuration district.Be not dynamically configured the time slot that district takies and then constitute static configuration district, for static configuration district still by the logic channel carrying out configuration service by hand.Can be there is multiple dynamic-configuration district in system, but the time slot that these dynamic-configuration districts take can not be overlapping.
Step 2: for each dynamic-configuration district, arranges a business Automatic Configuration Server (ServiceAuto-ConfigureServer, SACS).
Here, business Automatic Configuration Server is the software module of a responsible service logical channels configuration, directly can preset some configuration parameters in this software module.
Step 3: the parameter described business Automatic Configuration Server needing store is set.
Step 4: described business Automatic Configuration Server, according to the parameter of described storage, produces corresponding multiplexing configuration order or configuration file, and sends to multiplexing equipment, realize logic channel and automatically configure.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the business Automatic Configuration Server in described step 2 is integrated in multiplexing equipment, as a submodule of multiplexing equipment.
Further, the business Automatic Configuration Server isolated operation in described step 2, in the middle of independently equipment, is connected to multiplexing equipment to be configured by special purpose interface (as network interface) is long-range.
Further, in described step 3, business Automatic Configuration Server needs the parameter stored to comprise traffic flow parameters corresponding to multiplexed frame identifiable scope available in the starting time slots position in dynamic-configuration district and number of time slot, dynamic-configuration district, transport parameters for physical layer that different service types is corresponding, different service types and business event table.
Further, each list item of described business event table is a business event, and each business event described comprises:
Business event sequence number, for providing the execution sequence of business event;
The business event time of implementation, be used to indicate the time of implementation of this business event;
Business event type, comprises business interpolation, business release and business modification;
Business event parameter set, needs the parameter of carrying when performing for providing each business event, when business event is different, the parameter of carrying is also different.
Further, when described business event type is business interpolation, the business event parameter that described business event parameter set provides comprises the bandwidth demand of the mark of new business, the type of new business and new business.
Further, when described business event type is business release, the business event parameter that described business event parameter set provides comprises the mark of business to be released.
Further, when described business event type is business modification, the business event parameter that described business event parameter set provides comprises the mark of business to be changed and the parameter of business to be changed.
Further, described step 4 comprises the following steps:
Step 41: according to business event sequence number, determines the business event of the current sequence number that described business Automatic Configuration Server will perform;
Step 42: the business event time of implementation judging current sequence number, when the time arrives, performs business event, is switched to the business event of Next Sequence after being finished again, if the time does not arrive, then continues to wait for;
Step 43: according to the type of business event and the parameter of business event, produces corresponding multiplexing configuration order or configuration file, and sends to multiplexing equipment to perform.
The invention has the beneficial effects as follows the automatic configuration realizing service logical channels by arranging a business Automatic Configuration Server.This collocation method has following characteristics:
Simplify the layoutprocedure of the logic channel of business.Webmaster personnel need not be concerned about the concrete configuration parameter of logic channel, only need understand the design parameter of service layer, and the design parameter of the logic channel of its correspondence will be produced automatically by SACS, this considerably reduce the parameter needing configuration, reduce the probability configuring and make mistakes.
Facilitate the support to short time service.The configuration of business can regularly perform, and webmaster only needs the time having preset initiation of services, the time that SACS can subscribe, and the configuration of the logic channel of automatic finishing service, this greatly facilitates the support to short time service.
Provide the ability of timing automatic service switchover.Due to the timing configured of supporting business, when also just achieving unattended operation, ability business automatically switched according to plan in advance.
Remain the compatibility with existing configuration mode.By being static configuration district and dynamic-configuration district by the time-slot division of transmission frame, business configures only for the logic channel in dynamic-configuration district automatically; And the logic channel in static configuration district still can be completed by manual configuration mode.
Accompanying drawing explanation
Fig. 1 is the flow chart of logic channel collocation method of the present invention;
Fig. 2 is the structure chart in dynamic-configuration district in logic channel collocation method in the embodiment of the present invention;
Fig. 3 is that in the embodiment of the present invention, business Automatic Configuration Server is integrated into the structure chart in multiplexing equipment;
Fig. 4 is the structure chart that in the embodiment of the present invention, business Automatic Configuration Server runs as autonomous device;
Fig. 5 is the business event table of the structure in the embodiment of the present invention;
Fig. 6 is the flow chart of business event implementation in the embodiment of the present invention;
The flow chart of implementation when Fig. 7 is business interpolation event in the embodiment of the present invention;
The flow chart of implementation when Fig. 8 is business release event in the embodiment of the present invention;
The flow chart of implementation when Fig. 9 is business modification event in the embodiment of the present invention.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, for the logic channel collocation method of CMMB system in this enforcement, comprise the following steps:
Step 1: reserved continuous K time slot from starting time slots N is as a dynamic-configuration district from transmission frame.
In order to realize the automatic configuration of service logical channels, first need to be automatic configure reserved time slot from transmission frame.As shown in Figure 2, the transmission frame of CMMB is made up of 40 time slots (TS0 – TS39), wherein time slot 0 is used for control information transmission as control channel, time slot 1 is used for transport service information to time slot 39 as Traffic Channel, wherein 31 time slots (TS1 ~ TS31) are static configuration district above, for supporting the isometric Continuous-time business of audio frequency, video, broadcasting channel; Last 8 time slots (TS32 ~ TS39) are dynamic-configuration district, for supporting the business of short time service or other demand dynamic changes.Business in static configuration district is still configured by webmaster personnel are manual and safeguard.Can be there is multiple dynamic-configuration district in system, but the time slot that these dynamic-configuration districts take can not be overlapping.
Step 2: for each dynamic-configuration district, arranges a business Automatic Configuration Server.
Here, business Automatic Configuration Server is the software module of a responsible service logical channels configuration, directly can preset some configuration parameters in this software module.Business Automatic Configuration Server has two kinds of usages, and as shown in Figure 3, described business Automatic Configuration Server can be integrated in multiplexing equipment, as a submodule of multiplexing equipment; Again as shown in Figure 4, the isolated operation of described business Automatic Configuration Server, in the middle of independently equipment, is connected to multiplexing equipment to be configured by special purpose interface (as network interface) is long-range.
Step 3: the parameter described business Automatic Configuration Server needing store is set.
Here, described business Automatic Configuration Server needs the parameter stored to comprise traffic flow parameters corresponding to multiplexed frame identifiable scope available in the starting time slots position in dynamic-configuration district and number of time slot, dynamic-configuration district, transport parameters for physical layer that different service types is corresponding, different service types and business event table.Specific as follows:
The starting time slots in dynamic-configuration district and number of time slot: in the present embodiment, the starting time slots in dynamic-configuration district is 32, number of time slots is 8.
Multiplexed frame identifiable scope available in dynamic-configuration district: in the present embodiment, multiplexed frame mark accounts for 6 bits altogether, and we specify here, and 0 to 31 for identifying the multiplexed frame on static slot configuring area; 32 to 63 for identifying the multiplexed frame on dynamic slot configuring area, and namely available on dynamic slot configuring area multiplexed frame identifiable scope is 32 to 63.
The transport parameters for physical layer that different service types is corresponding: for wireless broadcast system, once networking is complete, in order to ensure its covering performance, the transport parameters for physical layer that same type of service adopts generally is fixed after a test, and these physical layer configuration parameter comprise RS code check, LDPC code rate, interleaving mode, modulation system and scrambler mode.Here, the transport parameters for physical layer that miscellaneous service type is corresponding can be pre-set, the business on existing 530 frequencies:
When type of service is video broadcasting, corresponding transport parameters for physical layer comprises that RS code check is (240,192), LDPC code rate is 1/2, interlace mode is mode 3, modulation system is QPSK, scrambler mode is pattern 0.
When type of service is audio broadcasting, corresponding transport parameters for physical layer comprises that RS code check is (240,192), LDPC code rate is 1/2, interlace mode is pattern 1, modulation system is QPSK, scrambler mode is pattern 0.
When type of service is data broadcast, corresponding transport parameters for physical layer comprises that RS code check is (240,176), LDPC code rate is 1/2, interlace mode is pattern 1, modulation system is QPSK, scrambler mode is pattern 0.
The traffic flow parameters that different service types is corresponding: for wireless broadcast system, once networking is complete, the Business Stream of same type of service generally can adopt fixing parameter configuration at (comprising one or more in video flowing, audio stream, data flow).Pre-set business stream parameter is carried out, the business on existing 530 frequencies according to type of service:
When type of service is video broadcasting, this business at least comprises a video flowing and an audio stream, and wherein video flowing default parameter is: encapsulation mode is pattern 1, the medium type of video flowing is 96, the type of coding of video flowing H.264, the frame per second of video flowing is 25; Audio stream default parameter is: encapsulation mode is pattern 1, the medium type of audio stream is 97, the type of coding of audio stream is HE-AAC, the sample rate of audio stream is 48000.
When type of service is audio broadcasting, this business at least comprises an audio stream, and the audio stream default parameter of its correspondence is: encapsulation mode is pattern 1, the medium type of audio stream is 97, the type of coding of audio stream is AAC, the sample rate of audio stream is 48000.
When type of service is data broadcast, this business at least comprises a data flow, and the data flow default parameter of its correspondence is: encapsulation mode is pattern 2, data unit type is that data broadcast XPE wraps.
Business event table: each list item of business event table is a business event, and each business event described comprises: business event sequence number, for providing the execution sequence of business event; The business event time of implementation, be used to indicate the time of implementation of this business event; Business event type, comprises business interpolation, business release and business modification; Business event parameter set, needs the parameter of carrying when performing for providing each business event.
When business event type is different, the parameter that described business event parameter set carries is also different, specific as follows:
When described business event is business interpolation, the business event parameter that described business event parameter set provides comprises the bandwidth demand of the mark of new business, the type of new business and new business;
When described business event is business release, the business event parameter that described business event parameter set provides comprises the mark of business to be released;
When described business event is business modification, the business event parameter that described business event parameter set provides comprises the mark of business to be changed and the parameter of business to be changed.
Construct a simple business event table, as shown in Figure 5, known business event sequence number represents the precedence that business event performs, and the time of implementation of the business that sequence number is low can not exceed the time of implementation of the high business event of sequence number.As can be seen from the table shown in Figure 5, between 7 o'clock to 9 o'clock of on August 1st, 2012, there are four business event etc. pending successively, that is:
Sequence number be 100 business event 7: 0: 0 perform, its business event type be business add, its business event parameter set comprises: business to be added be designated 620, i.e. SERVICE_ID=620 in Fig. 5; The type of business to be added is video broadcast service, i.e. SERVICE_TYPE=VIDEO in Fig. 5; The bandwidth of business to be added is 500Kbps, i.e. SERVICE_BW=500Kbps in Fig. 5;
Sequence number is that the business event of 101 was execution in 7: 30: 0, its business event type is that business is added, its business event parameter set comprises: business to be added be designated 2020, i.e. SERVICE_ID=2020 in Fig. 5, the type of business to be added is data broadcast service, i.e. SERVICE_TYPE=DATA in Fig. 5; The bandwidth of business to be added is 100Kbps, i.e. SERVICE_BW=100Kbps in Fig. 5;
Sequence number is that the business event of 102 was execution in 8: 0: 0, its business event type is business modification, its business event parameter set comprises: business to be changed be designated 2020, i.e. SERVICE_ID=2020 in Fig. 5, the bandwidth of business to be changed is 50Kbps, i.e. SERVICE_BW=50Kbps in Fig. 5;
Sequence number be 103 business event 9: 0: 0 perform, its business event type be business release, its business event parameter set comprises: business to be released be designated 620, i.e. SERVICE_ID=620 in Fig. 5.
Step 4: described business Automatic Configuration Server, according to the parameter of described storage, produces corresponding multiplexing configuration order or configuration file, and sends to multiplexing equipment, realize logic channel and automatically configure, divide three steps below to realize:
Step 41: according to business event sequence number, determines the business event of the current sequence number that described business Automatic Configuration Server will perform;
Step 42: the business event time of implementation judging current sequence number, when the time arrives, performs business event, is switched to the business event of Next Sequence after being finished again, if the time does not arrive, then continues to wait for;
Step 43: according to the type of business event and the parameter of business event, produces corresponding multiplexing configuration order or configuration file, and sends to multiplexing equipment to perform.
Business event flow chart according to Fig. 6, above-mentioned three steps can specifically describe and be: after business Automatic Configuration Server startup optimization, determine that initialization event sequence number is s, judge whether system time is more than or equal to the time of implementation of event s again, if not, namely represent the time of implementation of non-arrival event s, then continue to wait for, if system time is the time of implementation being more than or equal to event s, then perform event s; After being finished, be switched to business event, and judge whether next business event exists, exist and then repeat above-mentioned flow process, do not exist, terminate execution event.
When business event type is different, corresponding implementation is also different.
As shown in Figure 7, when business event type is business interpolation, its implementation is: after business Automatic Configuration Server startup optimization, first checks that whether service parameter is effective, invalid then End Event performs, and effectively then judges whether service parameter puts into existing multiplexed frame further; If put into, determine the multiplexed frame mark that business is put into, start to carry out multiplexed sub frame mark again to distribute, if service parameter does not put into existing multiplexed frame, then first carry out multiplexed frame mark to distribute, again according to type of service determination multiplexed frame physical layer parameter, be that multiplexed frame distributes time slot according to service bandwidth again, then add a multiplexed frame, and mark distribution is carried out to multiplexed sub frame; After the mark of multiplexed sub frame is assigned, according to type of service determination service parameter, then add a multiplexed sub frame, finally terminate the execution that this business adds event.
As shown in Figure 8, when business event type is business release, its implementation is: after business Automatic Configuration Server startup optimization, first check that whether service identification is effective, invalid, terminate execution event, effectively then determine the multiplexed frame F at the multiplexed sub frame mark that service identification is corresponding and place, then multiplexed sub frame corresponding to service identification is deleted, judge whether also have multiplexed sub frame in multiplexed frame F again, if having, the time slot position that change multiplexed frame takies, if not, the multiplexed frame shared by deletion business; Finally terminate the execution of this business release event.
As shown in Figure 9, when business event type is business modification, its implementation is: after business Automatic Configuration Server startup optimization, first checks that whether service identification is effective, invalid, terminate execution event, effectively then judge whether service parameter to be modified is service bandwidth; If service parameter to be modified is service bandwidth, then adjust multiplexed frame time slot allocation, then revise the multiplexed frame of time slot position variation successively, terminate the execution of this business modification event; If service parameter to be modified is not service bandwidth, then determine the multiplexed sub frame at service identification place, then revise the corresponding parameter of described multiplexed sub frame, terminate the execution of this business modification event.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1., for a logic channel collocation method for China Mobile multimedia broadcasting system, it is characterized in that, comprise the following steps:
Step 1: reserved continuous print time slot is as a dynamic-configuration district in transmission frame;
Step 2: for each dynamic-configuration district, arranges a business Automatic Configuration Server;
Step 3: the parameter described business Automatic Configuration Server needing store is set; Wherein, the parameter of described storage comprises multiplexed frame identifiable scope available in the starting time slots position in dynamic-configuration district and number of time slot, dynamic-configuration district, transport parameters for physical layer that different service types is corresponding, traffic flow parameters, business event table that different service types is corresponding;
Step 4: described business Automatic Configuration Server, according to the parameter of described storage, produces corresponding multiplexing configuration order or configuration file, and sends to multiplexing equipment, realize logic channel and automatically configure.
2. logic channel collocation method according to claim 1, is characterized in that, the business Automatic Configuration Server in described step 2 is integrated in multiplexing equipment, as a submodule of multiplexing equipment.
3. logic channel collocation method according to claim 1, is characterized in that, the business Automatic Configuration Server isolated operation in described step 2, in the middle of independently equipment, is connected to multiplexing equipment to be configured by special purpose interface is long-range.
4. logic channel collocation method according to claim 1, is characterized in that, each list item of described business event table is a business event, and each business event comprises:
Business event sequence number, for providing the execution sequence of business event;
The business event time of implementation, be used to indicate the time of implementation of this business event;
Business event type, comprises business interpolation, business release and business modification;
Business event parameter set, needs the parameter of carrying when performing for providing each business event.
5. logic channel collocation method according to claim 4, it is characterized in that, when described business event type is business interpolation, the business event parameter that described business event parameter set provides comprises the bandwidth demand of the mark of new business, the type of new business and new business.
6. logic channel collocation method according to claim 4, is characterized in that, when described business event type is business release, the business event parameter that described business event parameter set provides comprises the mark of business to be released.
7. logic channel collocation method according to claim 4, is characterized in that, when described business event type is business modification, the business event parameter that described business event parameter set provides comprises the mark of business to be changed and the parameter of business to be changed.
8. according to logic channel collocation method according to claim 1, it is characterized in that, described step 4 comprises the following steps:
Step 41: according to business event sequence number, determines the business event of the current sequence number that described business Automatic Configuration Server will perform;
Step 42: the business event time of implementation judging current sequence number, when the time arrives, performs business event, is switched to the business event of Next Sequence after being finished again;
Step 43: according to business event type and business event parameter set, produces corresponding multiplexing configuration order or configuration file, and sends to multiplexing equipment to perform.
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