CN101873540A - Method for switching mobile multimedia broadcasting services and corresponding receiving device - Google Patents
Method for switching mobile multimedia broadcasting services and corresponding receiving device Download PDFInfo
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Abstract
The invention relates to a method for switching mobile multimedia broadcasting services and a corresponding receiving device. The method comprises the following steps of: selecting, namely selecting and receiving one mobile multimedia broadcasting service; judging, namely judging whether the quality of a signal bearing the service is low than a set threshold or the service still exists in the signal; searching, namely if the signal quality is low than the set threshold or the service does not exist in the signal, searching the services by the receiving device; and reselecting, selecting the service from the searched services and receiving the service. By adopting the method, the receiving device can switch the services according to a broadcast signal or a geographical position and dynamically keeps the watching of a specific service unaffected.
Description
Technical field
The present invention relates to a kind of method for switching mobile multimedia broadcasting services and corresponding receiver devices, especially a kind of China Mobile multimedia broadcasting industry standard (China Mobile MultimediaBroadcasting, broadcast receiver CMMB) of relating to.
Background technology
In recent years, digital mobile multimedia broadcasting technology and standard evolution are rapid, the multiple digital mobile multimedia broadcasting network that grows up based on different technologies and standard has appearred respectively in Europe and the U.S., DVB-H (digital video broadcast-handheld formula reception: Digital Video Broadcast Handheld) as Europe, the MediaFLO of the U.S. (the single forward link of medium: Media Forward Link Only), Broadcast and Multicast Services) and BCAST (broadcasting: Broadcast) etc. based on the BCMCS of mobile cellular (broadcast multi-broadcasting service:, and can be its receiving system user many service content are provided, as advertisement, weather forecast, news, sports cast, variety, the multimedia broadcasting play, programs such as film, the user can select the service program of Mobile Multimedia Broadcasting according to the hobby of oneself.SARFT(The State Administration of Radio and Television) in 2006 formally issued the China Mobile multimedia broadcasting industry standard (China Mobile Multimedia Broadcasting, CMMB) after, the mobile multi-media broadcast program of China also becomes thereupon and is enriched.
CMMB adopts the technical system of " world one ", that is: utilize high-power S-band satellite to cover national 100% territory, utilizing the ground overlay network to carry out crowded city, effectively to cover, utilize two-way return path to realize mutual, forms the system of One-to-All Broadcast and the seamless covering that two-way interaction combines, central and local governments combine.In the system of CMMB constituted, the CMMB signal mainly realized that by S-band satellite overlay network and U wave band ground overlay network signal covers.S-band satellite network broadcasts channel is used for direct reception, and the Ku wave band is up, and S-band is descending; Distribution channels is used for ground supplement and transmits reception, and the Ku wave band is up, and the Ku wave band is descending, transfers S-band to by ground supplement forwarded device and sends to mobile receiving system.For realizing effective covering of crowded city mobile multimedia broadcast television signal, adopt the emission of U wave band terrestrial wireless to make up U wave band ground, city overlay network.
Fig. 1 is the structural representation of hierarchical network.Say on the whole, this standard can be set up one and cover nationwide hierarchical network, promptly according to the requirement that covers the region, whole mobile multimedia broadcast system is divided into multistage network structure, make that on the region higher level's network can cover one or more undernets; Simultaneously, for each network all disposes independently multiplexer, the basic carrier frequency that each network configuration is different.Like this, the business of higher level's network is finished data flow after multiplexing at the multiplexer of network at the corresponding levels, just can directly send to all receiving systems in the network's coverage area at the corresponding levels via network transmitter at the corresponding levels, or deliver to via distributing network on the transmitter of undernet, send to all receiving systems in this net overlay area via the undernet transmitter again.And aspect reception, after receiving system enters whole mobile media broadcasting network, can judge that this receiving system is the zone that only is positioned at higher level's network coverage, still be positioned at the common zone that covers of higher level's network and undernet; If only be positioned at higher level's network's coverage area, then this receiving system can only receive the business of higher level's network, selects to wish the program of reception according to the control information on the basic carrier frequency; If receiving system is positioned at higher level's network and the common zone that covers of undernet, then this receiving system both can receive the business of higher level's network, also can receive the business of undernet.And when receiving system breaks away from the undernet overlay area, then can interrupt current service, and forwarding the basic carrier frequency of higher level's network then to, the prompting user reselects.
Fig. 2 is the schematic diagram of the program that obtains when being positioned at zones of different of the receiving system under the hierarchical network.After mobile receiving system enters whole mobile media broadcasting network, might carrier frequency or utilize a network of network information table to judge that this receiving system is the zone that only is positioned at a network coverage by search institute, still be positioned at a plurality of networks zone of covering jointly.If receiving system is positioned at the common zone that covers of a plurality of networks, then the business that this receiving system can any one network of selective reception utilizes the adjacent area network information in the network information table (must provide in the two grade network) to realize internetwork quick switching.When if receiving system breaks away from a two grade network overlay area, interrupt current service, forward the basic carrier frequency of primary network station then to, the prompting user reselects business/program.Mobile receiving system is according to the difference of its present position, can selective reception Mobile Multimedia Broadcasting net (primary network station or two grade network) business/program, when receiving system was brought into use the service of Mobile Multimedia Broadcasting net, receiving system at first inserted the basic carrier frequency of some networks by search; When receiving system is positioned at the common overlay area of a plurality of networks (primary network station, two grade network), except the program that receives the region two grade network, can also receive the program of primary network station, can receive the business of primary network station and the business of two grade network 2A as the receiving system a among the figure, receiving system b and receiving system c can receive the business of primary network station and two grade network equally; When receiving system d only is positioned at the overlay area of a network, can only receive the business of a network.When the service of receiving system at the some two grade network 2A of use, but during the situation of the overlay area of generation disengaging two grade network 2A, receiving system prompting user current service earlier will interrupt or directly interrupt, and utilize the adjacent area network information in the network information table to forward basic carrier frequency on the primary network station to then.When two grade network uses a plurality of carrier frequency, should specify the basic carrier frequency of a carrier frequency equally as two grade network, the business of two grade network at first is chosen on the basic carrier frequency of two grade network and carries, unless just do not have enough capacity to use other carrier frequency of two grade network on the basic carrier frequency of two grade network.
Suppose that the user uses the CMMB receiving system, the current news hookup program that just moves the CCTV-1 that watches that secondary net 2A is provided in the zone that secondary net 2A is covered, when the zone that the user covers from the 2A zone to 2B, three kinds of situations can take place: the one, the signal quality instability, may variation consequently can't accept midway, need more switching network or frequency, change the back signal quality and improve; The 2nd, signal quality is good, but because the program ordering changes, causes that the program of watching changes, as the CCTV-1 that watches before, but, become CCTV-5 now according to before setting, need reselect program, perhaps, more reselect program behind switching network or the frequency; The 3rd, enter the blind area, can not receive signal, system can point out the user and forward some contents that receiving system inside provides to.The parameter of characterization signal quality can be signal to noise ratio, the error rate, low density parity check code (LOW DENSITY PARITY CHECK, LDPC) error rate, band internal power, frequency error, bit error rate, the perhaps parameter that other can the characterization signal quality.
Also have, if the user just at steering vehicle, has no time to watch whether he can store this program, wait him to watch again afterwards if having time? if the poor signal of certain time period U wave band or when not having signal, could could system switch to S-band and keep watching this programs?
Summary of the invention
The purpose of this invention is to provide and a kind ofly carry out professional method and the related device that switches according to broadcast singal or geographical position, in addition, also provide a kind of can be according to user's needs, carry out automatically professionally switching and keeping constant method and the related device of program.
The present invention is achieved in that
A kind of method for switching mobile multimedia broadcasting services, this method comprise, select step: select and receive a mobile multi-media broadcasting service; Determining step: judge whether the signal quality that carries described business is lower than preset threshold or whether described business also is present in the described signal; Search step: if described signal quality is lower than preset threshold or described business when not being present in the described signal, receiving system is searched for described business; Reselect step: from the described business that searches, select and receive described business.
In order to realize the present invention better, described search step also comprises, other frequencies of network that comprised in the search network information table.
In order to realize the present invention better, described search step also comprises, the adjacent area network frequency that is comprised in the search network information table.
In order to realize the present invention better, described search step also comprises, the S frequency range of defined and the frequency that the U frequency range is comprised in the search national standard.
In order to realize the present invention better, described search step also comprises, locks a frequency, and according to defined service identification of lasting business/short time service allocation table that receives and frequency numbering, search comprises the frequency of described business; The described step of reselecting also comprises, according to the signal quality of described each frequency that searches, selects a good frequency and a switching of signal quality to receive.
In order to realize the present invention better, described method comprises that also after searching a satisfactory signal, described receiving system keeps and receives described program, and carries out remaining search on the backstage.
In order to realize the present invention better, described method also comprises, obtains the current location of described receiving system; At least obtain the signal coverage areas of the network or the frequency of described current location periphery; Carry out described search step according to current location of being obtained and overlay area.
In order to realize the present invention better, described search step is from the close-by examples to those far off to carry out apart from the distance of each overlay area according to current location.
In order to realize the present invention better, described signal coverage domain information is from the storage data of described receiving system.
In order to realize the present invention better, the described signal coverage domain information that obtains is from described mobile multimedia broadcast signal.
In order to realize the present invention better, the order of other frequencies of network has precedence over adjacent area network frequency in the described search step.
In order to realize the present invention better, the order of frequency that undernet comprises has precedence over the frequency that higher level's network is comprised in the described search step.
In order to realize the present invention better, described method also comprises, records the program of selected reception.
In addition, the present invention also provides another kind of method for switching mobile multimedia broadcasting services, and this method comprises, selects step: select and receive a mobile multi-media broadcasting service; Position obtaining step: obtain the current location of described receiving system and the signal coverage areas of described current network or frequency; Determining step: judge whether described current location is in the edge of described signal coverage areas; Search step: if described current location is in the edge of described signal coverage areas, receiving system is searched for described business; Reselect step: from the described business that searches, select and receive described business.
In order to realize the present invention better, described method also comprises, obtains the signal coverage areas of the network or the frequency of described current location periphery at least; Carry out described search step according to current location of being obtained and overlay area.
In order to realize the present invention better, described search step is from the close-by examples to those far off to carry out apart from the distance of each overlay area according to current location.
In order to realize the present invention better, described signal coverage domain information is from the storage data of described receiving system.
In order to realize the present invention better, the described signal coverage domain information that obtains is from described mobile multimedia broadcast signal.
Also have, the invention provides a kind of mobile multi-media broadcasting service receiving system, comprise, tuner, master controller, also comprise the multi-media broadcasting service switch unit in the described master controller, if when carrying the signal quality of described business and being lower than preset threshold or described business and not being present in the described current demand signal, described receiving system search also receives described business.
In order to realize the present invention better, described receiving system also comprises, the satellite fix information receiving unit is used to obtain the current location of described receiving system; Mass storage is used to store the business that receives; Described tuner comprises the tuner of two U frequency ranges or the tuner of two S frequency ranges at least; Described Mobile Multimedia Broadcasting is CMMB broadcasting.
After adopting technical scheme of the present invention, mobile multimedia broadcast receiving apparatus can carry out professional selection switching according to the information of system's transmission or the signal coverage numeric field data of storage inside, and the reception that can dynamically keep specific transactions, guarantee that watching of user is unaffected.In addition, because storage inside has network or frequency signal coverage areas, receiving system can switch to suitable business in suitable place fast.Because receiving system also is provided with memory, receiving system can be preserved program, watches in suitable for the user.
Description of drawings
Fig. 1 is the structural representation of hierarchical network;
Fig. 2 is the schematic diagram of the program that obtains when being positioned at zones of different of the receiving system under the hierarchical network;
Fig. 3 is the hardware block diagram of CMMB receiving system of the present invention;
Fig. 4 is first kind of way flow chart;
Fig. 5 is the 4th a kind of way flow chart.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 3 is the hardware block diagram of CMMB receiving system of the present invention.Signal receives by antenna 1, enter into CMMB signal receiving unit 2, through after the tuning demodulator 21, obtain baseband signal, by behind the transmission demultiplexing unit 22, obtain the multiplex data of certain programs again, the multiplex data of this programs comprises video, audio frequency and data, after passing through program demultiplexing unit 23 again, obtain video, audio frequency and data that this programs separates, decoding unit 24 pairs of videos, audio decoders also export audio output unit 4 to and liquid crystal display 5.Tuning demodulator 21 has comprised S-band tuning demodulator 211 that is used for the satellite reception and the tuning demodulator 212 that is used for the U wave band, is respectively applied for demodulation of satellite transmission signals and terrestrial transmission signal.In addition, program demultiplexing unit also dateout is given mass storage 3, is used for performance recording.Performance recording can be a whole program, also can be the part in the program, as audio frequency or video.The program demultiplexing unit is given mass storage 3 by selecting the corresponding data of output.CMMB signal receiving unit 2, audio output unit 4, liquid crystal display 5, mass storage 3, GPS receiving element 6, E2PROM (electricity erasable memorizer) 9 and push-button unit 8 all link to each other with master controller 7, and controlled by it.GPS receiving element 6 is used to receive satellite fix information, is used for determining the residing position of current C MMB receiving system.GPS receiving element 6 also can be the receiving element of the global position system of other types, as dipper system, Galileo system, or the like, also can locate by cellular base station, these localization methods are all quite ripe, just do not speak more here.E2PROM (electricity erasable memorizer) 9 is used to store some parameters or information-setting by user, and push-button unit 8 is used for user interactions, as switching on and shutting down, menu selection, program switching etc.
According to industry standard GY/T 220.2-2006, promptly " Mobile Multimedia Broadcasting part 2: multiplexing " wherein defined network information table, and be as shown in table 1.
| Grammer | Figure place | Identifier |
| Network information table () | ||
| ??{ | ||
| The table identification number | ??8 | ??uimsbf |
| The NIT table updating sequence number | ??4 | ??bslbf |
| Keep | ??4 | ??bslbf |
| Ask during system | ??40 | ??bslbf |
| National code | ??24 | ??uimsbf |
| Network-level | ??4 | ??bslbf |
| Network number | ??12 | ??bslbf |
| Network title length | ??8 | ??uimsbf |
| ??for(i＝0；i＜N；i++) | ||
| ??{ | ||
| Character | ??8 | ??uimsbf |
| ??} | ||
| The frequency numbering | ??8 | ??bslbf |
| Centre frequency | ??32 | ??bslbf |
| Bandwidth | ??4 | ??bslbf |
| Network others frequency quantity | ??4 | ??bslbf |
| ??for(i＝0；i＜N1；i++) |
| Grammer | Figure place | Identifier |
| ??{ | ||
| The frequency numbering | ??8 | ??uimsbf |
| Centre frequency | ??32 | ??bslbf |
| Bandwidth | ??4 | ??bslbf |
| Keep | ??4 | ??bslbf |
| ??} | ||
| Adjacent area the number networks | ??4 | ??bslbf |
| Keep | ??4 | ??bslbf |
| ??for(i＝0；i＜N2；i++) | ||
| ??{ | ||
| The adjacent area network-level | ??4 | ??bslbf |
| The adjacent area network number | ??12 | ??bslbf |
| The frequency numbering of the basic carrier frequency in adjacent area | ??8 | ??bslbf |
| Centre frequency | ??32 | ??bslbf |
| Bandwidth | ??4 | ??bslbf |
| Keep | ??4 | ??bslbf |
| ??} | ||
| ??CRC_32 | ??32 | ??uimsbf |
| ??} |
Table 1 network information table
Wherein,
Network-level is one 4 bit field, provides the rank of current network, is divided into 5 grades, and all the other 11 grades for keeping;
Network number be one 12 bit field and network-level together unique identification a network;
Network others frequency quantity is one 4 bit field, provides other frequency quantity that present networks is used;
Adjacent area the number networks is one 4 bit field, provides adjacent area the number networks;
The frequency numbering is one 8 bit field, represents employed frequency numbering, the unique corresponding centre frequency of each frequency.
According to industry standard GY/T 220.2-2006, i.e. " Mobile Multimedia Broadcasting part 2: multiplexing " wherein also defined lasting business/short time service allocation table, and be as shown in table 2.
| Grammer | Figure place | Identifier |
| Service allocation list () | ||
| ??{ | ||
| The table identification number | ??8 | ??uimsbf |
| Segment length | ??16 | ??uimsbf |
| Segment number | ??8 | ??uimsbf |
| The hop count amount | ??8 | ??uimsbf |
| The business configuration table updating sequence number | ??4 | ??bslbf |
| Keep | ??4 | ??bslbf |
| Number of services | ??16 | ??uimsbf |
| ??for(i＝0；i＜N1；i++) | ||
| ??{ | ||
| Service identification | ??16 | ??uimsbf |
| The frequency numbering | ??8 | ??bslbf |
| ??} | ||
| ??CRC_32 | ??32 | ??uimsbf |
| Grammer | Figure place | Identifier |
| ??} |
Table 2 continues business/short time service allocation table
Wherein,
Number of services is one 16 bit field, the professional sum of the expression network carrying;
Service identification is one 16 bit field, multimedia service of expression unique identification.
The frequency numbering is one 8 bit field, represents employed frequency numbering, the unique corresponding centre frequency of each frequency.
Like this, the CMMB receiving system does not interrupt for the program that keeps the user to watch, can adopt following several way.
First kind of way: as shown in Figure 4, receiving system can find the frequency that can replace fast in order to guarantee not have signal or poor signal, receiving system can be preserved other frequency of all-network and all the adjacent area network frequencies that comprises in the network information table, when current frequency poor signal or the CCTV-1 program lose, receiving system is at first searched for other frequency of all-network, search for all adjacent area network frequencies then, and according to the service identification of CCTV-1, carry the broadcasting frequency of CCTV-1 up to finding all, and, select a frequency and switch to play according to the signal quality of each frequency.
Second kind of way: in order to increase the reliability of first method, receiving system can travel through the S frequency range of national standard defined and all frequencies that the U frequency range is comprised automatically, and according to the service identification of CCTV-1, find all to carry the broadcasting frequency of CCTV-1, and, select a frequency and switch to play according to the signal quality of each frequency.
The third way: behind frequency of receiving system locking, receiving system can be according to the received lasting business/short time service allocation table of network, find all broadcasting frequencies that comprise the CCTV-1 service identification, travel through these frequencies then, according to the signal quality of each frequency, select a good frequency and a switching of signal quality to play.Like this, receiving system need not be searched for all frequencies, and just search comprises the frequency of the service identification of needs, if do not have the frequency that comprises the specific transactions sign in a network, then can search for next network, and Sou Suo efficient can improve much like this.
The 4th kind of way: during except the poor signal of current network, cause the CCTV-1 program to watch, receiving system also when need not to know removal search adjacent area network frequency, does not know which adjacent area network and frequency of search earlier yet.In order to make receiving system at the suitable adjacent area frequency of suitable place removal search, CMMB receiving system of the present invention has been stored the overlay area of each network and the overlay area that each frequency covered in each network, table 3 has provided the data structure definition of the single network of receiving system storage, except frequency overlay area and network's coverage area, the definition of other data is all the same with the definition of network information table.As can be seen from the table, the overlay area of the overlay area of each frequency and whole network all is stored in the E2PROM memory 9 of receiving system in the network, these data can obtain in actual measurement, and the zone that surrounds with many points, and these points are represented with latitude and longitude coordinates.GPS receiving element 6 obtains the positional information of current receiving system, and judges the current border of frequency overlay area or the border of the network coverage of whether being positioned at, and receiving system is selected network and frequency according to current location information then.
| Data structure definition | Note |
| The CMMB network |
| Data structure definition | Note |
| ??{ | |
| Network-level | Provide the rank of network |
| Network number | With network-level unique identification together a network |
| Network frequency quantity N1 | Provide the frequency quantity that present networks is used |
| ??for(i＝0；i＜N1；i++) | |
| ??{ | |
| The frequency numbering | Provide the frequency numbering at NIT place, the unique corresponding centre frequency of each frequency |
| Centre frequency | Provide concrete center-frequency parameters, unit is 10Hz |
| Bandwidth | 0 expression bandwidth is 8MHz; 1 expression bandwidth is 2MHz; |
| Keep | |
| The frequency overlay area | The overlay area of representing with the multiple spot latitude and longitude coordinates |
| ??} | |
| Network's coverage area | The overlay area of representing with the multiple spot latitude and longitude coordinates |
| ??} |
Table 3CMMB network stored data structure
When the CMMB receiving system was in the borderline region of network or frequency, perhaps during the current network poor signal, receiving system can begin to search for interchangeable network or frequency.The method of selecting is at first to calculate each regional geometric center, calculates the distance at current location and each region geometry center then, and the preferential selection that distance is the shortest just the closer to the preferential more selection at center, is also referred to as the shortest principle of distance.According to the shortest principle of distance, receiving system at first finds a shortest frequency of distance from other frequency of current network, switch receiving system to this frequency, and judge whether this frequency comprises the CCTV-1 business, if comprise and signal quality suitable, then keep this frequency and watch; If do not comprise or signal quality improper, then switch to next beeline frequency and repeat said process.
If do not find corresponding frequency in the current network, just need from the network of adjacent area, seek corresponding frequency.Equally according to the shortest principle of distance, receiving system is selected the adjacent area network number that distance is the shortest from the adjacent area network of preserving, and system is switched to the frequency of this adjacent area network, regain this network of network information table, and according to other frequency point information of network that this table comprised, the same the shortest principle of distance of utilizing, select the frequency of a beeline, switch receiving system to this frequency, and judge whether this frequency comprises the CCTV-1 business, if comprise and signal quality suitable, then keep this frequency and watch; If do not comprise or signal quality improper, then switch to next beeline frequency and repeat said process.
If this adjacent area network is not found suitable frequency, then switch to the adjacent area network of next beeline and repeat said process.
Distribute from real network, receiving system only needs the network and the frequency that comprise in detection range receiving system 20 kilometer range.
In actual search, also can use the described method of the third way, behind frequency of receiving system locking, receiving system can be according to the received lasting business/short time service allocation table of network, find all broadcasting frequencies that comprise the CCTV-1 service identification, travel through these frequencies then, according to the signal quality of each frequency, select a good frequency and a switching of signal quality to play.
The 5th kind of way: CMMB receiving system of the present invention has been stored the overlay area of each network and the zone that all frequency and each frequencies covered in each network, table 3 has provided the data structure definition of the single network of receiving system storage, except frequency overlay area and network's coverage area, the definition of other data is all the same with the definition of network information table.As can be seen from the table, the overlay area of the overlay area of each frequency and whole network all is stored in the E2PROM memory 9 of receiving system in the network, and these data can obtain in actual measurement.GPS receiving element 6 obtains the positional information of current receiving system like this, and judges the current border that whether is positioned at the frequency overlay area or the network coverage, and receiving system is selected network and frequency according to current location information then.The method of selecting is at first to calculate each regional geometric center, calculates the distance at current location and each region geometry center then, and the preferential selection that distance is the shortest just the closer to the preferential more selection at center, is also referred to as the shortest principle of distance.According to the shortest principle of distance, device is selected the shortest network of distance from the network of preserving, and then according to from all frequencies of this network, selecting a frequency that distance is the shortest and receiving system is switched to this frequency apart from the shortest principle, judge the signal quality quality then, if signal quality is suitable, judge whether to comprise the service identification of CCTV-1 again, if comprise then switch to this business.If signal quality is bad or do not comprise CCTV-1, then switch to the shortest frequency of next distance, all frequencies that comprise up to this network all tried.If also do not find, then switch to the shortest network area of next distance, and the step above repeating.The direct use device canned data of this method carries out the selection switching of network or frequency, compares it with the 4th kind of way, and the content stores of its search does not need to resolve earlier the entrained various tables of CMMB signal in this locality, and speed is faster like this.
Distribute from real network, receiving system only needs the network and the frequency that comprise in its 20 kilometer range of detection range.
The 6th kind of way: way four and way five set in advance because network and frequency point information directly are stored on the receiving system, in case the CMMB network upgrades, signal coverage areas changes, and receiving system just can not adapt to this variation well.In order to address this problem, this method sends signal coverage areas in network information table together, and table 4 is the network information tables that increased signal coverage areas, and the signal coverage areas of each frequency in each network and the network is all had corresponding field.For simplification information, each overlay area all adds radius with central point to be described, and wherein central point is represented with latitude and longitude coordinates, and longitude and latitude all are floating number (float), and radius represents with floating number that also unit is a kilometer.Just signal coverage areas can be sent when the CMMB system launches like this.After receiving system is resolved these data, it can be stored in this locality, like this, way four and way five can be utilized these data.
Except can transmit signal coverage areas in network information table, system also can transmit in other tables or data segment, as long as comprised corresponding signal coverage numeric field data in the signal, all is that the present invention is claimed.
| Grammer | Figure place | Identifier |
| Network information table () | ||
| ??{ | ||
| The table identification number | ??8 | ??uimsbf |
| The NIT table updating sequence number | ??4 | ??bslbf |
| Keep | ??4 | ??bslbf |
| Ask during system | ??40 | ??bslbf |
| National code | ??24 | ??uimsbf |
| Network-level | ??4 | ??bslbf |
| Network number | ??12 | ??bslbf |
| Network title length | ??8 | ??uimsbf |
| Network's coverage area | ??96 | ??float |
| ??for(i＝0；i＜N；i++) | ||
| ??{ | ||
| Character | ??8 | ??uimsbf |
| ??} | ||
| The frequency numbering | ??8 | ??bslbf |
| Centre frequency | ??32 | ??bslbf |
| Bandwidth | ??4 | ??bslbf |
| The frequency overlay area | ??96 | ??float |
| Grammer | Figure place | Identifier |
| Network others frequency quantity | ??4 | ??bslbf |
| ??for(i＝0；i＜N1；i++) | ||
| ??{ | ||
| The frequency numbering | ??8 | ??uimsbf |
| Centre frequency | ??32 | ??bslbf |
| Bandwidth | ??4 | ??bslbf |
| The frequency overlay area | ??96 | ??float |
| Keep | ??4 | ??bslbf |
| ??} | ||
| Adjacent area the number networks | ??4 | ??bslbf |
| Keep | ??4 | ??bslbf |
| ??for(i＝0；i＜N2；i++) | ||
| ??{ | ||
| The adjacent area network-level | ??4 | ??bslbf |
| The adjacent area network number | ??12 | ??bslbf |
| Network's coverage area | ??96 | ??float |
| The frequency numbering of the basic carrier frequency in adjacent area | ??8 | ??bslbf |
| Centre frequency | ??32 | ??bslbf |
| Bandwidth | ??4 | ??bslbf |
| The frequency overlay area | ??96 | ??float |
| Grammer | Figure place | Identifier |
| Keep | ??4 | ??bslbf |
| ??} | ||
| ??CRC_32 | ??32 | ??uimsbf |
| ??} |
Table 4 New Network Information table
All comprised search in the top method, this is a task more consuming time, and in order to finish search sooner, system can have precedence over adjacent area network frequency according to the network others frequency, undernet has precedence over higher level's network, and the principle that the U frequency range has precedence over the S frequency range travels through.
For the time that the user is waited for watch reduces as far as possible, after device has found a suitable frequency, keep this frequency and watch the program of CCTV-1.The remaining frequency that does not have search can be at the running background search operation.If in ensuing search, there is the better frequency of the quality of reception to comprise CCTV-1, then replaces the professional of current maintenance and watch the CCTV-1 program that it is entrained.In order to move backstage search, receiving system comprises two groups of tuned cells at least, as the tuner of two U frequency ranges, and the perhaps tuner of two S frequency ranges, the perhaps tuner of two U frequency ranges and S frequency range.
The front is mentioned, the parameter of characterization signal quality can be signal to noise ratio, the error rate, low density parity check code (LOW DENSITY PARITY CHECK, LDPC) error rate, band internal power, frequency error, bit error rate, the perhaps parameter that other can the characterization signal quality.Judge one or more that a signal quality can be according to these parameters, and be respectively threshold value of these parameter settings that if poor signal or be not suitable for receiving, promptly signal parameter is lower than preset threshold, then starts professional function of search.
Described above all is the business of watching, but general in moving the process that receives, the user can not watch program, during as steering vehicle.Under the circumstances, CMMB receiving system of the present invention also comprises mass storage 3, and when being inconvenient to watch, the user can be recorded to its programs of interest on this memory, by the time watches at one's leisure again.In order to keep the continuity of program recording, need utilize six kinds of methods recited above in the process of recording, its process is the same substantially.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. a method for switching mobile multimedia broadcasting services is characterized in that, this method comprises,
Select step: select and receive a mobile multi-media broadcasting service;
Determining step: judge whether the signal quality that carries described business is lower than preset threshold or whether described business also is present in the described signal;
Search step: if described signal quality is lower than preset threshold or described business when not being present in the described signal, receiving system is searched for described business;
Reselect step: from the described business that searches, select and receive described business.
2. method for switching mobile multimedia broadcasting services as claimed in claim 1 is characterized in that, described search step also comprises, other frequencies of network that comprised in the search network information table.
3. method for switching mobile multimedia broadcasting services as claimed in claim 2 is characterized in that, described search step also comprises, the adjacent area network frequency that is comprised in the search network information table.
4. method for switching mobile multimedia broadcasting services as claimed in claim 1 is characterized in that, described search step also comprises, the S frequency range of defined and the frequency that the U frequency range is comprised in the search national standard.
5. method for switching mobile multimedia broadcasting services as claimed in claim 1 is characterized in that,
Described search step also comprises, locks a frequency, and according to defined service identification of lasting business/short time service allocation table that receives and frequency numbering, search comprises the frequency of described business;
The described step of reselecting also comprises, according to the signal quality of described each frequency that searches, selects a good frequency and a switching of signal quality to receive.
6. method for switching mobile multimedia broadcasting services as claimed in claim 1 is characterized in that, described method comprises that also after searching a satisfactory signal, described receiving system keeps and receives described program, and carries out remaining search on the backstage.
7. as any described method for switching mobile multimedia broadcasting services in the claim 1 to 6, it is characterized in that described method also comprises, obtains the current location of described receiving system; At least obtain the signal coverage areas of the network or the frequency of described current location periphery; Carry out described search step according to current location of being obtained and overlay area.
8. method for switching mobile multimedia broadcasting services as claimed in claim 7 is characterized in that, described search step is from the close-by examples to those far off to carry out apart from the distance of each overlay area according to current location.
9. method for switching mobile multimedia broadcasting services as claimed in claim 8 is characterized in that, described signal coverage domain information is from the storage data of described receiving system.
10. method for switching mobile multimedia broadcasting services as claimed in claim 8 is characterized in that, the described signal coverage domain information that obtains is from described mobile multimedia broadcast signal.
11., it is characterized in that the order of other frequencies of network has precedence over adjacent area network frequency in the described search step as any described method for switching mobile multimedia broadcasting services in the claim 1 to 6.
12., it is characterized in that the order of frequency that undernet comprises has precedence over the frequency that higher level's network is comprised in the described search step as any described method for switching mobile multimedia broadcasting services in the claim 1 to 6.
13., it is characterized in that described method also comprises, records the program of selected reception as any described method for switching mobile multimedia broadcasting services in the claim 1 to 6.
14. a method for switching mobile multimedia broadcasting services is characterized in that, this method comprises,
Select step: select and receive a mobile multi-media broadcasting service;
Position obtaining step: obtain the current location of described receiving system and the signal coverage areas of described current network or frequency;
Determining step: judge whether described current location is in the edge of described signal coverage areas;
Search step: if described current location is in the edge of described signal coverage areas, receiving system is searched for described business;
Reselect step: from the described business that searches, select and receive described business.
15. method for switching mobile multimedia broadcasting services as claimed in claim 14 is characterized in that, described method also comprises, obtains the signal coverage areas of the network or the frequency of described current location periphery at least; Carry out described search step according to current location of being obtained and overlay area.
16. method for switching mobile multimedia broadcasting services as claimed in claim 15 is characterized in that, described search step is from the close-by examples to those far off to carry out apart from the distance of each overlay area according to current location.
17. method for switching mobile multimedia broadcasting services as claimed in claim 16 is characterized in that, described signal coverage domain information is from the storage data of described receiving system.
18. method for switching mobile multimedia broadcasting services as claimed in claim 16 is characterized in that, the described signal coverage domain information that obtains is from described mobile multimedia broadcast signal.
19. mobile multi-media broadcasting service receiving system, comprise, tuner (21), master controller (7), it is characterized in that, described master controller also comprises the multi-media broadcasting service switch unit in (7), if when carrying the signal quality of described business and being lower than preset threshold or described business and not being present in the described current demand signal, described receiving system search also receives described business.
20. mobile multi-media broadcasting service receiving system as claimed in claim 19 is characterized in that, described receiving system also comprises, satellite fix information receiving unit (6) is used to obtain the current location of described receiving system; Mass storage (3) is used to store the business that receives; Described tuner (21) comprises the tuner of two U frequency ranges or the tuner of two S frequency ranges at least; Described Mobile Multimedia Broadcasting is CMMB broadcasting.
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Application publication date: 20101027 |