CN101047776A - Mobile broadcast network system and method for implementing synchronous of the network - Google Patents
Mobile broadcast network system and method for implementing synchronous of the network Download PDFInfo
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Abstract
This invention discloses a mobile broadcast network system and a method for synchronization, in which, the system includes: a content providing end providing and sending program information with the requirement of playing time, a region service end receiving the play time and program information sent by the content providing end and generating MAC data packets with timestamp and sending them to base stations governed by it to transmit the MAC data packets within the time appointed by the timestamp, which applies same primary time at the program transmission end, region sservice end and base stations and adds requirement on playing time in program information and attaches timestamp on the MAC data packet to guarantee synchronous play of programs among different regions and local areas.
Description
Technical field
The present invention relates to ICT (information and communication technology) in the field of information transmission, refer in particular to a kind of mobile broadcast network system and realize the method for this Network Synchronization.
Background technology
At present along with the developing rapidly of ICT (information and communication technology), it is also more and more that people understand the approach of information, for example by the Internet and radio and television etc., but radio and television always all with fixing pattern in operation, up to the rise of mobile TV technology.This notion of mobile TV not only comprises mobile phone terminal, has also comprised other kinds portable terminal (holding personal terminal or the like as mobile unit, notebook computer, hand).
Mobile TV also can be called mobile phone TV services, it is the concrete application of digital technology, it is by the transmission of digital signal, make picture quality more clear, image receives more stable, after the mobile TV receiving system is installed on the various vehicles or other portable terminals, can support in the larger context normally, move clearly and receive, make allegro modern metropolitan cities crowd can enjoy the TV programme such as news, amusement, study of mobile TV customization whenever and wherever possible.
At present, mobile phone TV services mainly adopt following three kinds of systems to realize:
1, based on the clean culture or the multi-cast system of traditional mobile communications network; The tradition mobile network comprises existing 2G, 2.5G and 3G mobile networks such as GSM, WCDMA.
2, based on the clean culture or broadcasting (as the S-DMB) system of satellite system;
3, based on mobile broadcast system (as DVB-H, MediaFlow).
Mobile phone TV services make the portable terminal can TV reception, and realize streaming media service, therefore can greatly enrich daily life and exchange of information.At present, be more competitive alternative based on the mobile TV communication system of radio network, many on probation and formal commercial systems have been arranged.And the program that transmits in the mobile broadcast network is kept between different districts is important problem in the radio network synchronously.In present radio network, there is certain delay time error in neighbor cell base station sent same content regular meeting (as Network Transmission time-delay, clock drift etc.) for various reasons.
In these cases, if single frequency network, adjacent place just has two nonsynchronous programs in the sub-district so, can cause the phase mutual interference between them.If do not take certain synchronisation measures, delay time error will slowly add up, if error accumulation is arrived to a certain degree, user terminal just can't receive and decode operation normally.If the multifrequency networking,,, when switching, the sub-district also can cause the discontinuous of program so if the delay time error accumulation is too big though the program in adjacent place, sub-district can the phase mutual interference.
Summary of the invention
The invention provides a kind of mobile broadcast network system and realize the method for this Network Synchronization, in order to solving the same content that neighbor cell base station sent that exists in the prior art time error of can surviveing, and then cause the discontinuous problem of program when phase mutual interference and sub-district are switched between nonsynchronous program.
The inventive method comprises:
A kind of mobile broadcast network system, content provides end, and storage has the programme information of reproduction time and it is sent; The professional end in area, received content provides the programme information of end, and generate to have to specify according to this programme information and play the MAC packet of timestamp constantly, sending to each base station that it has under its command then, the base station sends described MAC packet when the timestamp fixed time arrives.
Described content provides end and the professional end in described area to be two or more, and a plurality of described contents provide transmits programme information mutually to the professional end in one or more area between the end.
The professional end in described area comprises the timestamp generation unit, and the appointment broadcast that has according to programme information generates the incidental timestamp of MAC packet constantly.
Whether the base station that has under its command of the professional end in described area comprises that timestamp detects judging unit, detect the incidental timestamp of MAC packet and be in the time window of setting, determines whether to send described MAC packet.
The base station that has under its command of the professional end in described area also comprises the feedback information unit, detects judging unit with described timestamp and is connected;
Detect the incidental timestamp of MAC packet when the time window of setting is outer when timestamp detects judging unit,, by the feedback information unit time deviation feedback information is given then that the area is professional holds to feedback information unit transmitting time deviation information;
The professional end in area carries out the transmission of MAC bag is adjusted according to the time deviation information of feedback information unit feedback.
The present invention also provides a kind of method that realizes that mobile broadcast network is synchronous, the fiducial time of professional end each base station of having jurisdiction over, calibration in advance area, and carry out following steps:
A, regional professional termination receipts content provide the programme information that reproduction time requires that has that provides are provided, and generate to carry and specify the MAC packet of playing moment timestamp;
B, described MAC packet is sent to the base station that has under its command of the professional end in area, plays when constantly arriving, send described MAC packet when specifying.
Described step B further comprises the step that the timestamp to the MAC packet of receiving that has timestamp detects:
Determine that this timestamp whether in predefined time window, if in time window, then places it in the buffer memory, and sends this MAC packet in the time of timestamp appointment; If timestamp outside time window, then abandons this MAC packet; If the timestamp of the MAC packet in the buffer memory equals the zero-time of time window, then send this MAC packet.
If timestamp is outside predefined time window, the base station is determined the time deviation of timestamp and current time window beginning or end and feeds back to the area business to hold, and the professional end in area is according to the MAC packet of this time deviation selection transmitting time stamp in described time window.
If the subsidiary timestamp of the MAC packet of current reception is determined early than current time window starting time in the base station, then the professional MAC packet of delaying according to this time deviation select time stamp of holding in area sends;
If the terminal time that the subsidiary timestamp of MAC packet of current reception is later than the current time window is determined in the base station, then the professional end in area sends according to this time deviation select time stamp MAC packet in advance.
May further comprise the steps the fiducial time of professional end each base station of having jurisdiction over, calibration area:
A1: the professional end in area sends the empty bag of the test MAC that has timestamp to having the base station under its command;
A2: the empty bag of the free test MAC that stabs of base station receiving belt, the time deviation that stab computing time feeds back to the professional end in area;
A3: the professional end in area comes the time reference of step calibration self just according to the time deviation information that has each base station feedback under its command, sets up the professional end in area and is connected with the initial of base station.
May further comprise the steps the fiducial time of professional end each base station of having jurisdiction over, calibration area calibrates:
A1 ': the professional end in area is set up the time synchronized between professional end in area and the base station according to the time reference of gps system calibration self.
The present invention also provides a kind of base station, comprising:
The programme information receiving element, the MAC packet that carries timestamp information that is made of programme information that receives that the professional end in the area of having jurisdiction over the base station provides sends to timestamp and detects judging unit;
Timestamp detects judging unit, detects the incidental timestamp of described MAC packet, arrives to specify to play at timestamp constantly this MAC packet to be sent to the programme information transmitting element;
The programme information transmitting element sends the described MAC packet that receives.
This base station also comprises:
The feedback information unit detects the testing result of judging unit according to timestamp, when incidental timestamp and setting-up time have time deviation, determines time deviation and sends to professional end the in area under the base station.
Beneficial effect of the present invention is as follows:
The present invention is by adopting identical fiducial time at area business end and base station, by in programme information, adding the reproduction time requirement, wrap additional reproduction time at the MAC of program data and stab, guarantee the synchronous playing of program between different regions, the different districts.This programme not only can be eliminated the interference that the sub-district adjacent zone causes owing to program is asynchronous in the single frequency network; Program non-continuous event in the time of can also avoiding between multifrequency group network system sub-district or different regions, switching.
Description of drawings
Fig. 1 is a system architecture diagram of the present invention;
Fig. 2 is the synchronous schematic diagram of timestamp of the present invention;
Fig. 3 is the frame structure composition diagram of signal of the present invention;
Fig. 4 is a method flow diagram of the present invention;
Fig. 5 is a base station of the present invention time window schematic diagram;
Fig. 6 is an architecture of base station block diagram of the present invention.
Embodiment
The invention provides a kind of mobile broadcast network system and realize the method for this Network Synchronization, can there be delay time error to solve same frequency net (SFN) the same content that neighbor cell base station was sent that exists in the prior art, and then causes the problem of phase mutual interference between nonsynchronous program.The present invention adopts the mode that additional period is stabbed in broadcast program, the time of broadcast program data is made accurate regulation, and can detect timestamp in the base station, guarantee the synchronism of each sub-district playing programs, avoid the place adjacent to have the mutual interference of program phase and nonsynchronous phenomenon in the sub-district.
For solving problems of the prior art, realize purpose of the present invention, the present invention proposes a kind of mobile broadcast network system, its structured flowchart as shown in Figure 1: this system comprises:
Content provides end 11, and programs stored information also sends it to the professional end 12 in area, and wherein this programme information includes the programme content of broadcast and the time that requirement is play;
The professional end 12 in area, received content provides the programme information of end 11, holding the 12 reproduction times generations according to this programme information to have by the area business specifies the MAC packet of playing moment timestamp, when the appointment broadcast arrives constantly, sends described MAC data by having base station 13 under its command.The professional end in wherein said area can have one or more base stations under its command.
In system of the present invention, described content provides end 11 and the professional end 12 in described area can be two or more; A plurality of described contents provide between the end 11 can transmit programme information mutually; A described content provides end 11 to provide program to the professional end 12 in one or more area.In the practical application, content provides end 11 different programs to be offered the professional end 12 in different areas play according to the actual requirements, carries the business of various scales neatly.For example the Content supply end 11 of a local level can only send program to a professional end 12 in area; And a Content supply end 11 at central level can send program to the professional end 12 in a plurality of areas; Perhaps send program as transfer, to obtain bigger program coverage rate to a plurality of Content supply ends 11.Specifically can be referring to the structured flowchart of Fig. 1, for example wherein content end Z is provided is exactly that content as a transfer broadcast program Z1 provides end.
Among the present invention, when content provides end 11 to provide program to the professional end 12 in one or more areas, all on the program that it provided, attached the reproduction time of program, if require at two broadcast programs of professional 12 while of end of area, it be identical that then additional reproduction time requires, and the timestamp that generates in subsequent step is also identical; Otherwise reproduction time requires can be different, and the timestamp that generates in subsequent step is also inequality.The required precision of broadcast program time can be determined by concrete application among the present invention, be accurate to second usually, and synchronous with natural time.
It is different that the timestamp of MAC packet requires both with the incidental reproduction time of program.Wherein the playing programs time is mainly used in indication program time of beginning to play, and when guaranteeing to switch between the zone that the professional end in different regions belongs to, program can have certain continuity, can not be interrupted.And timestamp be mainly used in guarantee programming between the professional end of areal 12 base stations that have under its command synchronously, in order to avoid at cell boarder because the asynchronous self-interference that causes of same program signal on the identical frequency; In addition, if a program has identical reproduction time requirement in two professional ends in adjacent area, then timestamp can realize that also the program of base station in these two the professional ends in area is synchronous.In general, only subsidiary one of program (or a few) reproduction time requirement; And the data of a program will be divided into numerous MAC packets, and each MAC packet all will attach a timestamp.In the present invention, timestamp can adopt natural time to represent also to adopt frame structure to represent, specifies as follows:
1) be common mode for the natural time structure, as 18: 22: 33 125 milliseconds.
2) for the expression mode of frame structure, with reference to figure 3, in existing system, the frame structure of signal is fixed, and the frame structure of higher level (as time frame, branch frame, second frame etc.) is to keep synchronous with natural time, timestamp can by MAC wrap the place time frame, divide the sequence number of frame, second frame, superframe, transmission frame, little five frames, Frame to form, as the 22nd branch frame of the 18th time frame the 33rd second frame the 1st superframe.Above example in fact provided the conversion relation of frame structure sequence number and natural time, promptly " 18: 22: 33 125 milliseconds " correspondence " 22nd minute frame of the 18th time frame the 33rd second frame the 1st superframe ".Superframe down is divided into transmission frame, little five frames, Frame etc. again, though these frame structures are not evenly to distribute but fixing, therefore also can convert with natural time.Because all kinds of MAC packets finally are to be mapped among the various frame structures, therefore, adopt timestamp in the present embodiment based on various frame number forms for for simplicity.
Provide a concrete timestamp example below, for example timestamp is made up of 15 bits altogether, and wherein 9 bits are indicated the superframe sequence numbers, and the sequence number value is 0～479, all superframes among the corresponding branch frame 480*125ms=60s; In each second frame 8 superframes are arranged, totally 480 superframes; 2 bit indication transmission frame sequence numbers, 4 transmission frames in the corresponding superframe, the sequence number value is 0～3; The sequence number of 11 little five frames of 4 bit indications, sequence number is from 0～10.These bits are recycled, for example indicated all superframes in the branch frame after, represent 9 bits of superframe sequence number should be by zero setting; Divide in the frame at the next one, again superframe is begun counting.The sequence number reset mode and the superframe sequence number reset mode of other frame types are similar.In actual applications, the parameter word length of above-mentioned timestamp can be adjusted according to concrete application and frame structure.
In the present embodiment, the timestamp that the MAC packet that generates in the professional end 12 in area is taken is that the timestamp generation unit 14 by the professional end 12 in area forms, and this timestamp sends to this area's business with the packing of MAC packet and holds 12 all base stations 13 that have under its command.Timestamp is designated as MACTransTime; Each MAC packet can attach a timestamp; Described timestamp MACTransTime is used to indicate base station 13 the MAC packet to be sent out at which time point.
In order to realize that program is synchronous between the base station of professional end 12 inside, an area, be identical the fiducial time of all base stations of the professional end of areal subordinate, is designated as BaseTime, calibrates by GPS and similar system.The MAC bag that timestamp is MacTransTime should be MacTransTime constantly to be sent by the base station at BaseTime, thereby realizes that the program between the different districts is synchronous.
In addition, in the actual play process, in order not take a large amount of base stations cache resources, the described base station 13 of native system is contained timestamp and is detected judging unit 15, whether it act as the incidental timestamp of detection MAC packet and is in the time window of setting, and then determines whether to send described MAC packet.Be in the setting-up time window as timestamp, when the appointment broadcast of timestamp is constantly identical with fiducial time, base station 13 can will be sent by the MAC packet that play content constitutes, if timestamp not in the time window of setting, the base station will not send the MAC packet.In system of the present invention, described time window, whether the MAC packet that its role is to detect arrival postpones or in advance, a time window is made up of zero-time StartTime and termination time EndTime, zero-time StartTime with termination time EndTime along with the base station BaseTime fiducial time variation of passing, as shown in Figure 5.In actual applications, in order to compensate the MAC bag is launched the caused time-delay of processing, zero-time StartTime can shift to an earlier date by BaseTime fiducial time more current than the base station, and concrete lead can be determined by concrete equipment time-delay, application demand.In other words, the time difference between BaseTime and the StartTime is that the transmitter module 20 of base station is handled a MAC packet, and it is launched the required time from antenna.
Identical with MACTransTime, above-mentioned StartTime, EndTime and BaseTime also can express with natural time and two kinds of forms of frame structure.
In the present embodiment, described base station also comprises the feedback information unit, detects judging unit 15 with described timestamp and is connected; The feedback information unit is used for the error between appended timestamp of the professional end 12 feedback MAC packets in area and fiducial time BaseTime.
Below the timestamp process of feedback is done concise and to the point description: when timestamp detects judging unit 15 and detects outside the time window that the incidental timestamp of MAC packet setting, then to feedback information unit transmitting time deviation information, the feedback information unit gives the time deviation feedback information area professional end 12 again; The professional end 12 in area is according to the MAC packet of the time deviation Information Selection transmission of feedback information unit feedback.Wherein can be referring to the content of Fig. 2 for the detection schematic diagram of timestamp, promptly timestamp and MAC packet are sent to the base station by the professional end in area 12, detect judging unit 15 in the base station by timestamp and carry out the timestamp checking procedure, by the feedback information unit of base station the deviation of timestamp is fed back to the professional end in area then.
The processing procedure of timestamp is: if the incidental timestamp of MAC packet is within the time window of setting, then the base station can be left this MAC packet among the buffer memory, timestamp specify arrive constantly in, the MAC packet enters the emission processing module and is sent to sub-district under the base station.
The incidental timestamp of MAC packet that arrives the base station must not be early than zero-time StartTime; Also must not be later than termination time EndTime; If a MAC packet is received in the base station, and the incidental timestamp of this MAC does not drop within the time window; Then the base station information feedback unit will be to area professional end feedback what happens, and promptly the base station needs the deviation of stamp detection time and feeds back to the professional end in area; The professional end in described area carries out the timestamp adjustment, selects the MAC packet of transmitting time stamp in described time window.
Below in conjunction with system architecture diagram of the present invention native system is realized that the process of synchronous playing describes, as shown in fig. 1, content provides end 11X to provide program X1 and corresponding reproduction time 10:00 to the professional end of area professional end 12A and area 12B simultaneously.After described area professional end 12A, 12B received this program X1 and reproduction time thereof, the program data stream of dispatching, recombinate carried the MAC packet of timestamp with generation, and transfers to the base station that has under its command separately.Wherein timestamp is to be that benchmark generates with the time that the program requirement is play.Because the reproduction time of area professional end 12A, 12B is identical, therefore, the timestamp of generation is also identical.In addition, if the base station that area business end A, B have under its command all is to use same time reference to proofread and correct, then two area interior programs of professional end affiliated area can not interfere with each other.
Based on the said system that the present invention proposes, referring to Fig. 4, the present invention proposes a kind of method that realizes that mobile broadcast network is synchronous, the fiducial time of professional end each base station of having jurisdiction over, calibration in advance area, and carry out following steps:
A, regional professional termination receipts content provide end 11 programme informations that provide, and generate to carry and specify the MAC packet of playing moment timestamp;
B, described MAC packet is sent to the base station, plays when constantly arriving, send described MAC packet when specifying.
In the method for the invention, step B further comprises the step that the timestamp to the MAC packet that has timestamp received detects:
Determine that this timestamp whether in predefined time window, if in time window, then sends this MAC packet; If timestamp outside time window, then abandons this MAC packet.
If timestamp is outside predefined time window, the base station is determined the time deviation of timestamp and current time window beginning or end and feeds back to the area business to hold, and the professional end in area is according to the MAC packet of this time deviation selection transmitting time stamp in time window.
If the subsidiary timestamp of the MAC packet of current reception is determined early than current time window starting time in the base station, then the professional MAC packet of delaying according to this time deviation select time stamp of holding in area sends; If the terminal time that the subsidiary timestamp of MAC packet of current reception is later than the current time window is determined in the base station, then the professional end in area sends according to this time deviation select time stamp MAC packet in advance.
Content in conjunction with system of the present invention and Fig. 1, Fig. 5 is elaborated to method of the present invention:
Content provides end X program X1 to be provided and to require to the professional end 12 in area and plays at 10:00.Realizing by reproduction time synchronously of same program between the professional end affiliated area of different regions.And the program between the different base station that the professional end of areal has under its command is realized by timestamp synchronously.
Simple and clear for what narrate, we amplify time scale in the example below, and the minimum time interval is taken as 1 minute, but not the millisecond in the real system, microsecond.
Content provides end X to provide program X1 to area professional end A, and requires area professional end A to begin to play this program at 10:00.For synchronous playing program A1 between each base station (being the sub-district) that has under its command at regional service terminal, will carry out following processing:
Area professional end A generates the MAC packet that has timestamp, and timestamp and MAC packet is sent to all base stations that has under its command according to data and the reproduction time requirement of program X1.It has the base station under its command will control the transmission of MAC packet according to timestamp; Wherein the size of time window is corresponding with the buffer memory of base station, if buffer memory is more, then time window can suitably be got bigger; Otherwise time window is less.Detect judging unit 15 by described timestamp and determine these timestamps whether in predefined time window, if in time window, then this MAC packet enters buffer memory, waits to be sent; If timestamp outside time window, then abandons this MAC packet, and corresponding situation is fed back to the professional end 12 in described area by the signal feedback unit.
As shown in Figure 5, current fiducial time, BaseTime was 10:03, because the processing of the transmitter module 20 of base station is 1 minute when slow, the zero-time of time window is to be taken as 10:04, and the termination time is 10:08.
At this moment, timestamp is that the MAC bag of 10:02 is not enter emission processing module 20; Otherwise after handling through 1 minute emission, fiducial time, BaseTime became 10:04; Wrap in BaseTime and when 10:02, be sent out away and the timestamp of 10:02 is this MAC of requirement.In other words be exactly, this MAC bag has been postponed arrival in 2 minutes, should be dropped, and simultaneously corresponding situation is fed back to the professional end in described area.Similarly, timestamp is the transmitter module 20 that the MAC bag of 10:03 also should not enter the base station.
And timestamp is the MAC bag of 10:04, can enter transmitter module 20 in fiducial time when BaseTime is for 10:03.After 1 minute emission processing, fiducial time, BaseTime became 10:04, and is consistent with the timestamp 10:04 of MAC packet just, in the moment that requires this MAC packet launched by antenna.
The size of time window is relevant with the size of base station related cache, if the base station can 5 MAC packets of buffer memory, then time window size as shown in Figure 5 is 5 minutes.Like this, when timestamp is the MAC packet arrival of 10:09,5 MAC packets have been arranged in the buffer memory, can't place newly arrived MAC packet again, therefore, this MAC packet also will be dropped, and by the feedback information unit corresponding situation is fed back to the professional end in described area, and then the MAC packet of selecting to be in the time window sends according to existing processing mode by Base-Band Processing, digital-to-analogue conversion and Frequency-variable Modulation module in the emission processing module.
The playing process of other programs and principle and program X1 are similar substantially, so do not giving unnecessary details at this.
In the practical application, before carrying out the programme information broadcast, need calibrating to the each several part in the system (the professional end in area, base station etc.).The step of promptly calibrating is:
A1 ': the professional end in area is according to the time reference of gps system calibration self, and it is synchronous fiducial time with the base station on time to set up regional professional end group.
In addition, the professional end in area also can send some test MAC skies that have timestamp and wrap the base station and estimate the time deviation that begins, to obtain BaseTime fiducial time of each base station this moment, calibrates self time whereby, and set up initial connection, concrete steps are:
A1: the professional end in area sends the empty bag of the test MAC that has timestamp to having the base station under its command;
A2: the empty bag of the free test MAC that stabs of base station receiving belt, the time deviation that stab computing time feeds back to the professional end in area;
A3: the professional end in area comes the time reference of step calibration self just according to the time deviation information that has each base station feedback under its command, sets up the professional end in area and is connected with the initial of base station.
In native system, base station BaseTime fiducial time should be identical with the fiducial time of the professional end in area, but allows certain error, half of the maximum time that its error range should can be indicated less than timestamp.If error between the two, then will be offset the maximum time of (in advance or postpone) timestamp representative the launch time of MAC packet greater than half of maximum time of timestamp representative.
The present invention also provides a kind of base station in addition, as shown in Figure 6, comprise: programme information receiving element 61, the MAC packet that carries timestamp information that is made of programme information that receives that the professional end 12 in the area of being had jurisdiction over base station 13 provides sends to timestamp and detects judging unit 15; Timestamp detects judging unit 15, detects the incidental timestamp of described MAC packet, arrives to specify to play at timestamp constantly this MAC packet to be sent to programme information transmitting element 61; Programme information transmitting element 62 sends the described MAC packet that receives.In the present embodiment, this base station 13 also comprises: feedback information unit 63, detect the testing result of judging unit 15 according to timestamp, when incidental timestamp and setting-up time have time deviation, determine time deviation and send to that the area of having jurisdiction over the base station is professional holds.The workflow of relevant this base station and principle can not repeat them here referring to above-mentioned system and method thereof.
As shown in the above, the invention provides a kind of system and method for Mobile Broadcast Services, can customize Mobile Broadcast Services flexibly and easily, by additional reproduction time requirement on programme content, and generate the timestamp that is attached on the MAC packet in view of the above, finally utilize timestamp to realize the synchronous scheme of broadcast data between the sub-district that reaches between the regional service center.The invention solves the interference that the sub-district adjacent zone causes owing to program is asynchronous in the single frequency network; This scheme also can be used in the radio network of multifrequency networking.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (13)
1, a kind of mobile broadcast network system is characterized in that: comprise
Content provides end, and storage has the programme information of reproduction time requirement and sends;
The professional end in area, the programme information that requires with reproduction time that receives that described content provides that end sends, generate the MAC packet that has timestamp by the professional end in described area according to reproduction time requirement and programme information, and sending to each base station that it has under its command, the base station sends described MAC packet when the specified time of timestamp arrives.
2, system according to claim 1 is characterized in that, described content provides end for a plurality of, and per two contents provide and transmit programme information between the end mutually; The professional end in described area is for a plurality of, and each regional professional termination is received the programme information that one or more content provides end to send.
3, system according to claim 1 is characterized in that, the professional end in described area comprises the timestamp generation unit, and the appointment reproduction time that has according to programme information generates the incidental timestamp of MAC packet.
4, system according to claim 3, it is characterized in that, the base station that has under its command of the professional end in described area comprises that timestamp detects judging unit, whether the incidental timestamp of detection MAC packet is in the time window of timestamp detection judging unit setting, thereby determines whether to send described MAC packet.
5, system according to claim 4 is characterized in that, the base station that has under its command of the professional end in described area also comprises the feedback information unit, detects judging unit with described timestamp and is connected;
Detect the incidental timestamp of MAC packet when the time window of setting is outer when timestamp detects judging unit, to feedback information unit transmitting time deviation information, the time deviation feedback information is given that the area is professional holds in the feedback information unit;
The professional end in area carries out the transmission of MAC bag is adjusted according to the time deviation information of feedback information unit feedback.
6, a kind of method that realizes that mobile broadcast network is synchronous is characterized in that, the fiducial time of professional end each base station of having jurisdiction over, calibration in advance area, and carry out following steps:
A, regional professional termination receipts content provide the programme information that reproduction time requires that has that provides are provided, and generate to have and specify the MAC packet of playing moment timestamp;
B, described MAC packet is sent to the base station that has under its command of the professional end in area, when timestamp specified reproduction time to arrive, the base station sent described MAC packet.
7, method according to claim 6 is characterized in that, step B further comprises the step that the timestamp to the MAC packet of receiving detects:
Determine that this timestamp whether in predefined time window, if in time window, then places it in the buffer memory, and sends this MAC packet in the timestamp fixed time; If timestamp outside time window, then abandons this MAC packet.
8, method according to claim 7, it is characterized in that, when timestamp is determined outside predefined time window the time in the base station, the time deviation of timestamp and current time window beginning or end is determined and feeds back to the professional end in area that the professional end in area selects transmitting time to stab the MAC packet that is in the described time window according to this time deviation in the base station.
9, method according to claim 8, it is characterized in that, when the subsidiary timestamp of the MAC packet of current reception is determined early than current time during the window starting time in the base station, the time deviation of timestamp and current time window beginning or end is determined and feeds back to the professional end in area that then regional professional end stabs the MAC packet of delaying according to this time deviation select time and sends in the base station;
When the subsidiary timestamp of MAC packet of determining current reception when the base station is later than the terminal time of current time window, the time deviation of timestamp and current time window beginning or end is determined and feeds back to area business end that then the professional end in area sends according to this time deviation select time stamp MAC packet in advance in the base station.
10, method according to claim 6 is characterized in that, may further comprise the steps the fiducial time of professional end each base station of having jurisdiction over, calibration area:
A1: the professional end in area sends the empty bag of the test MAC that has timestamp to having the base station under its command;
A2: the empty bag of the free test MAC that stabs of base station receiving belt, the time deviation that stab computing time feeds back to the professional end in area;
A3: area business end basis has the time deviation information of each base station feedback under its command, the next time reference of step calibration self just, and foundation area business is held the time synchronized with the base station.
11, method according to claim 6 is characterized in that, may further comprise the steps the fiducial time of professional end each base station of having jurisdiction over, calibration area:
A1 ': the professional end in area is set up the time synchronized between professional end in area and the base station according to the time reference of gps system calibration self.
12, a kind of base station is characterized in that, comprising:
The programme information receiving element, the MAC packet that carries timestamp information that is made of programme information that receives that the professional end in the area of having jurisdiction over the base station provides sends to timestamp and detects judging unit;
Timestamp detects judging unit, detects the incidental timestamp of described MAC packet, arrives to specify to play at timestamp constantly this MAC packet to be sent to the programme information transmitting element;
The programme information transmitting element sends the described MAC packet that receives.
13, base station according to claim 12 is characterized in that, also comprises:
The feedback information unit detects the testing result of judging unit according to timestamp, when incidental timestamp and setting-up time have time deviation, determines time deviation and sends to professional end the in area under the base station.
Priority Applications (1)
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| CN102711265A (en) * | 2008-09-22 | 2012-10-03 | 宏达国际电子股份有限公司 | Method and related device of a trigger mechanism of buffer status report and scheduling request in a wireless communication system |
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| CN104901724A (en) * | 2015-04-15 | 2015-09-09 | 深圳市金立通信设备有限公司 | Data transmission method |
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