CN101052126A - Time diversifying method, system and cell phone TV terminal device - Google Patents
Time diversifying method, system and cell phone TV terminal device Download PDFInfo
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Abstract
The method comprises: by separately saving each MAC frame of each program bit stream in multi memory modules and making channel encode for the MAC frame saved in the memory modules, and then interlacing the MAC frame and sending the interlaced MAC frame in multi time slice, the sending end makes the program signals saved in the memory capable of crossing over a longer transmission time, and makes the terminal capable of receiving the broadcast signals in the bad channel condition and reaching an excellent receiving time diversity effects. By the invention, the mobile phone can receives HD TV program in bad channel condition.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to time diversifying method, system and cell phone TV terminal device in a kind of mobile TV system.
Background technology
The mobile TV technology is the technology that multimedia service is provided to portable terminal device or handheld terminal by the received terrestrial digital broadcasting network.Daily life and exchange of information are enriched in mobile phone TV services greatly, and therefore, the mobile TV technology also becomes research, the development goal of the next stage of industry.
In the mobile TV technology, the implication of mobile phone TV terminal has been extended on the various portable terminals, holds personal terminal or the like as mobile unit, notebook computer, hand.Because mobile phone TV terminal has portability and mobility, so, not only require the mobile reception of mobile phone TV terminal and interference free performance more superior, and require mobile phone TV terminal to have lower power consumption, can standby, the long time of work.
Because the requirement of low-power consumption, the general time-slotting of mobile TV system carries out work.The mobile TV system is in a timeslice, with all program carousels of present networks one time.Like this, mobile phone TV terminal can carry out work in the specific time of a timeslice, to receive the program that it need receive.In all the other times of a timeslice, mobile phone TV terminal turn-offs radio-frequency transmitter, to reach the purpose of saving power consumption.
Mobile phone TV terminal carries out work in the specific time of a timeslice, the length of this section operating time is generally tens to the hundreds of millisecond, and the length of a timeslice is generally about ten times of the mobile phone TV terminal one action time, thereby has reached the purpose of saving power consumption.
Because the one action time of mobile phone TV terminal arrives in the time range of hundreds of millisecond tens, if suffer more abominable channel circumstance in certain airtime of program, be in the reception environment of high-speed mobile or be in the reception environment of deep fade as mobile phone TV terminal, then the broadcast singal that this time receives of mobile phone TV terminal is most of is fallen by decline, and this will influence the quality of mobile phone TV terminal program receiving to a great extent.
DVB-H mobile TV standard adopts MPE-FEC (Multi-Protocol Encapsulation-Forward Error Correction sign indicating number) technology to carry out IP data encapsulation and forward error correction design at link layer, to tackle comparatively abominable channel circumstance.
The schematic diagram of the Multi-Protocol Encapsulation-Forward Error Correction sign indicating number of DVB-H mobile TV standard as shown in Figure 1.
Among Fig. 1, DVB-H mobile TV standard is stored upper layer data in the data field of memory block in the memory block of a 2Mbits of link layer design, then, carries out the forward error correction coding, generates checking data.At last, the data in the whole memory block are launched, in one action time such as 250ms, these data broadcastings are finished.
Be generally about 250ms a launch time of certain program of DVB-H mobile TV standard, in an airtime of this program, promptly in 250ms, when channel circumstance is very abominable, received signal all may be fallen by decline in whole signal bandwidth and this time airtime, in this case, even adopt stronger FEC (forward error correction), can not correct received signal, it is relatively poor to cause TV programme to receive the effect of watching.Therefore, in comparatively abominable channel circumstance, particularly in the channel circumstance of deep fade, the effect of the time diversity in the DVB-H mobile TV standard is bad.
Summary of the invention
The objective of the invention is to, time diversifying method, system and terminal equipment in a kind of mobile TV system are provided, strengthen the time of reception diversity, improve the reception viewing effect of cell phone TV terminal device in abominable channel circumstance.
For achieving the above object, the invention provides the time diversifying method in a kind of mobile TV system, comprising:
A, transmitting terminal with each mac frame separate storage of each program stream in a plurality of memory blocks;
B, transmitting terminal carry out chnnel coding for each mac frame in each memory block;
Each mac frame after c, transmitting terminal will be encoded carries out interweaving between memory block;
Each mac frame after d, transmitting terminal interweave interblock is mapped at least one timeslice, and sends.
In the described method:
Under the non-layered transmission mode, the MAC layer of transmitting terminal all is provided with the memory block of fixed qty for each program; Perhaps
Under the Delamination Transmission pattern, the MAC layer of transmitting terminal is provided with memory block and this program corresponding physical layer hierarchical modulation mode of predetermined quantity for each program according to programme attribute.
Under the Delamination Transmission pattern, the memory block of program stream comprises: the elementary stream memory block of storage elementary stream mac frame and storage strengthen the enhancing code stream memory block of code stream mac frame, and elementary stream memory block quantity, to strengthen code stream memory block quantity corresponding with the physical layer hierarchical modulation mode of this program.
The corresponding relation of the physical layer hierarchical modulation mode of elementary stream memory block quantity, enhancing code stream memory block quantity and this program is:
Physical layer hierarchical modulation mode is: 16QAM Delamination Transmission pattern, and the ratio that the memory block quantity of programme elementary stream and program strengthen the memory block quantity of code stream is 1: 1; Perhaps
Physical layer hierarchical modulation mode is: 32QAM Delamination Transmission pattern, and the ratio that the memory block quantity of programme elementary stream and program strengthen the memory block quantity of code stream is 2: 3; Perhaps
Physical layer hierarchical modulation mode is: 64QAM Delamination Transmission pattern, the ratio that the memory block quantity of programme elementary stream and program strengthen the memory block quantity of code stream is 1: 2.
Described memory block comprises: information data district and checking data district, and the mac frame of program stream is stored in the information data district of memory block, and the verification mac frame after the chnnel coding is stored in the checking data district of memory block.
In the described method: the MAC floor of transmitting terminal is provided with the size in information data district and checking data district in the memory block according to the channel coding rate of mac frame.
The frame head of mac frame comprises: program identification information, flow identification information, channel coding rate information, mac frame check information.
Described step a comprises:
The convergence-level of a1, transmitting terminal is encapsulated as the convergence flow bag with the data flow of the different-format of its reception, and the convergence flow bag is transferred to the MAC layer;
A2, MAC layer carry out the MAC framing with the convergence flow bag that receives, and with the mac frame separate storage in a plurality of memory blocks of respective program.
The MAC layer comprises the step that the convergence flow bag that receives carries out the MAC framing among the described step a2:
The MAC layer is the program data mac frame with the convergence flow bag MAC framing on the logic channel, is the public information mac frame with the scheduling control information MAC framing of each program.
Also comprise after the described step a:
When the mac frame of program stream does not fill up memory block, utilize predetermined mac frame that memory block is filled up.
Chnnel coding among the described step b comprises: the RS coding.
The step of mac frame separate storage in a plurality of memory blocks comprises among the described step a:
Transmitting terminal MAC layer is stored in a plurality of memory blocks according to the mac frame of row storage order with each program stream;
And described step b comprises:
Transmitting terminal MAC layer carries out chnnel coding according to the row order to the mac frame in the memory block.
Described method also comprised before step c:
The mac frame of transmitting terminal MAC layer after with chnnel coding carries out interweaving in the memory block;
And described step c comprises:
After transmitting terminal MAC layer interweaves in memory block, the mac frame in each memory block is carried out interweaving between memory block;
To the Delamination Transmission pattern, the mac frame in this programme elementary stream memory block carries out separately interweaving between memory block, and the mac frame that this program strengthens in the code stream memory block carries out separately interweaving between memory block.
Described steps d comprises:
Transmitting terminal MAC layer reads a mac frame successively by round-robin order from a plurality of memory blocks of a program, and the mac frame quantity that once reads is the integral multiple of memory block number;
The mac frame that transmitting terminal MAC layer will once read is mapped at least one timeslice of physical layer.
A kind of time diversity provided by the invention system comprises: a plurality of memory blocks, stores processor module, coding module, interleaving block and mapping block;
Stores processor module: be used for each mac frame separate storage with each program stream in a plurality of memory blocks;
Coding module: be used to the mac frame in each memory block to carry out chnnel coding;
Interleaving block: be used for the mac frame behind the coding is carried out interweaving between memory block, and the mac frame after interblock interweaved is stored in the memory block;
Mapping block: the mac frame after being used for the memory block interblock interweaved is mapped at least one timeslice, and sends.
Memory block comprises: information data district and checking data district, and the mac frame of program stream is stored in the information data district of memory block, and the verification mac frame that coding module carries out after the chnnel coding is stored in the checking data district of memory block.
Described stores processor module comprises: converge submodule and stores processor submodule;
Converging submodule is used for: the data flow of the different-format of its reception is encapsulated as the convergence flow bag, and the convergence flow bag is transferred to the stores processor submodule;
The stores processor submodule is used for: the convergence flow bag that receives is carried out the MAC framing, and with each mac frame separate storage in a plurality of memory blocks of respective program.
Described stores processor module or stores processor submodule are stored in a plurality of memory blocks according to the mac frame of row storage order with each program stream;
Coding module carries out the RS coding according to the row order to the mac frame in the memory block.
Interleaving block carries out the mac frame behind the program stream coding to interweave in the memory block, and after interweaving in carrying out memory block, interleaving block carries out interweaving between memory block, and each mac frame after interblock interweaved is stored in the memory block.
The present invention also provides a kind of cell phone TV terminal device, and described cell phone TV terminal device all is provided with a plurality of memory blocks at the MAC layer for each program;
When mobile phone TV terminal was supported the non-layered transmission mode, mobile phone TV terminal was stored in the programme elementary stream mac frame of its reception in a plurality of memory blocks of this program correspondence of MAC layer; Perhaps
When mobile phone TV terminal was supported the Delamination Transmission pattern, mobile phone TV terminal was stored in the programme elementary stream mac frame of its reception in the elementary stream memory block, and mobile phone TV terminal is stored in the program enhancing code stream mac frame of its reception in the enhancing code stream memory block.
Mobile phone TV terminal is provided with the quantity of memory block in the mobile phone TV terminal MAC layer according to its ability rating, the program quality that the corresponding mobile phone TV terminal of described ability rating can be watched.
Description by technique scheme as can be known, the present invention is undertaken interweaving between separate storage, chnnel coding, memory block and being mapped as the processing that a plurality of timeslices send by each mac frame to a program stream, make the programme information in the memory block can cross over the long broadcast transmission time, make terminal equipment also effective receiving broadcast signal in abominable channel circumstance, reached excellent time of reception diversity; Interweave by increasing in the piece on the basis that interweaves at interblock, further improved the effect of time of reception diversity; Divide by mobile phone TV terminal being carried out ability, the present invention is being kept under the situation of excellent time of reception diversity, make the mobile phone TV terminal can the receiving high-definition TV programme; Thereby realized improving the purpose of the reception viewing effect of cell phone TV terminal device in abominable channel circumstance by technical scheme provided by the invention.
Description of drawings
Fig. 1 is the Multi-Protocol Encapsulation-Forward Error Correction sign indicating number schematic diagram of the DVB-H mobile TV standard of prior art;
Fig. 2 is the mobile TV system architecture schematic diagram of the embodiment of the invention;
Fig. 3 is a time diversifying method flow chart in the mobile TV system of the embodiment of the invention;
Fig. 4 is the RS coding schematic diagram of the MAC layer of the embodiment of the invention;
Fig. 5 is a weaving diagram one between the memory block of MAC layer of the embodiment of the invention;
Fig. 6 is a weaving diagram two between the memory block of MAC layer of the embodiment of the invention;
Fig. 7 is a weaving diagram three between the memory block of MAC layer of the embodiment of the invention;
Fig. 8 is a weaving diagram four between the memory block of MAC layer of the embodiment of the invention.
Embodiment
The present invention is directed to the short situation of time diversity length of hand held television terminal in the DVB-H standard, proposed a kind of scheme of time of reception diversity ability of enhancing, improved the effect that the TV programme reception is watched in abominable channel circumstance greatly.
For each program is provided with a plurality of memory blocks, memory block is used for the mac frame of programs stored code stream in the transmitting terminal MAC layer of the present invention, and the mac frame separate storage of a program stream is in a plurality of memory blocks.The number of the memory block of each program correspondence can determine according to programme attribute, and is many as the number of the memory block of high-definition television programs correspondence, the low-definition television program for the number of memory block few.If a program is to there being four memory blocks, then the mac frame of this program stream can be after expiring first memory block storage, remaining mac frame continues to store in second memory block, and continues to store in follow-up memory block according to the mac frame that the method will not stored.
Transmitting terminal MAC layer need carry out chnnel coding to the mac frame in the memory block, and the chnnel coding here can be the RS coding of variable bit rate, and the verification mac frame after the chnnel coding can be stored in the memory block of this program.
When the mac frame in the memory block has carried out after the chnnel coding, the interblock degree of depth that transmitting terminal MAC layer need carry out between the memory block the mac frame of storing in the memory block interweaves, here, transmitting terminal MAC layer also can carry out earlier interweaving in the piece of memory block, and then, the interblock that carries out between the memory block interweaves again, at last, the MAC layer is dispatched the back mac frame that interweaves, so that the mac frame in the memory block after interweaving is mapped in the different timeslices, and broadcast transmission several times.
By the processing of above-mentioned time diversity, the program stream mac frame in the MAC layer memory block just can be crossed over the long broadcast transmission time, has strengthened the time diversity ability of receiver greatly, has reached excellent time of reception diversity.
Below in conjunction with accompanying drawing technical scheme provided by the invention is described in detail.
Time diversifying method that the present invention proposes and time diversity system can be based on the system architectures of eating dishes without rice or wine of as shown in Figure 2 mobile TV system.
Among Fig. 2, the system of eating dishes without rice or wine of mobile TV system comprises: radio resource control layer, high level, convergence-level, media access control layer (MAC layer) and physical layer.Convergence-level, media access control layer are referred to as link layer.
High-rise program stream has two kinds in the transmission mode of link layer and physical layer: non-layered transmission mode and Delamination Transmission pattern.For the non-layered transmission mode, program stream is not distinguished, and promptly has only a kind of program stream.For the Delamination Transmission pattern, program stream is divided into: programme elementary stream and program strengthen code stream two classes.Wherein, programme elementary stream contains the necessary information of a playing programs, and programme elementary stream can be transmitted with the mode that compares robust; And program strengthens the information that code stream only comprises increases the program audience effect, and the reliability that program strengthens the code stream transmission is lower than programme elementary stream.
Be in the mobile phone TV terminal in the relatively poor reception environment, receive only programme elementary stream, and be in mobile phone TV terminal in the better reception environment, can all receive programme elementary stream and program enhancing code stream, strengthen code stream by program receiving, mobile phone TV terminal can reach than receiving only the better view reception effect of programme elementary stream.
Physical layer in the system of eating dishes without rice or wine to mac layer frame through physical layer channel code, interweave, process that digital modulation and carrier modulation send is described.Under the non-layered transmission mode, the modulation system that physical layer adopted has: QPSK, 16QAM, 32QAM, 64QAM; Under the Delamination Transmission pattern, the modulation system that physical layer adopted has: 16QAM, 32QAM, 64QAM.Under the Delamination Transmission pattern, programme elementary stream is mapped to four quadrants in the planisphere all the time, and the modulation system that is equivalent to programme elementary stream is: QPSK, program strengthen code stream corresponding to the particular location in the quadrant; Therefore, under the Delamination Transmission pattern, the flow-rate ratio that programme elementary stream under the 16QAM modulation system and program strengthen code stream is about 2: 2; Elementary stream under the 32QAM modulation system is about 2: 3 with the flow-rate ratio that strengthens code stream; Elementary stream under the 64QAM modulation system is about 2: 4 with the flow-rate ratio that strengthens code stream.
Convergence-level, MAC (medium access control) layer are referred to as link layer.Convergence-level is according to the convergence-level characteristic parameter of radio resource control layer configuration, data such as TS code stream, the IP code stream etc. of the different-format that high level is transmitted are handled respectively, their unifications are the convergence flow bag of predetermined length, are the long convergence flow bags of 188 byte packet as unification.Convergence-level sends to the convergence flow bag in the buffer area that the MAC layer opens up for each program.
The MAC layer is formulated the scheduling strategy of program transmission according to qos policy, the convergence flow bag of each program in the MAC layer buffer area is dispatched, and the convergence flow bag on the various logical channels is carried out the MAC framing handle, and forms the program data mac frame; Simultaneously, the public informations such as schedule information of each program are also carried out the MAC framing handle, form the public information mac frame.
The MAC layer is that public information mac frame and program data mac frame generate corresponding time marking information and physical layer control signaling information, and these information are carried in corresponding mac frame before to the physical layer base station transmits.Physical layer is finished the mapping of mac frame to the physical layer framing according to the time marking information and the physical layer control signaling information of its reception.The MAC layer also needs to respond the order of radio resource control layer, the operating position of the MAC layer buffer area of each program stream is measured, and with measurement feedback to radio resource control layer.
Time diversifying method provided by the invention is mainly finished in the MAC layer, and the time diversity process chart to program stream provided by the invention as shown in Figure 3.
Among Fig. 3, in step 300, the convergence-level of transmitting terminal of the present invention is the long convergence flow bags of 188 byte packet with the data such as the unifications such as TS code stream, IP code stream of the different-format that high level transmits, and these convergence flow bags are transferred to the MAC layer.
To step 310, transmitting terminal MAC layer is formulated the scheduling strategy of program transmission according to qos policy, convergence flow bag to each program in the MAC layer buffer area is dispatched, and the convergence flow bag on the various logical channels is carried out the MAC framing handle, and forms the program data mac frame; Simultaneously, the public informations such as schedule information of each program are also carried out the MAC framing handle, form the public information mac frame.
To step 320, transmitting terminal MAC layer is stored in the program data mac frame in a plurality of memory blocks of this program, can configuration information data field and checking data district in the memory block of MAC floor, the program data mac frame is stored in the information data district, and the verification mac frame that the follow-up RS coding of storage generates is waited until in the checking data district.The size in information data district and checking data district can be determined according to the speed of RS coding in memory block.When the MAC layer is stored to memory block with the program data mac frame, can these mac frames be stored in a plurality of memory blocks successively according to the order of row storage.
To step 330, transmitting terminal MAC layer carries out the RS coding to the program data mac frame of storing in the memory block, and the verification mac frame behind the RS coding is stored in the memory block of this program, as the verification mac frame being stored in the checking data district of memory block.When the MAC layer carries out the RS coding at the mac frame to the program stream of memory block, can carry out the RS coding to the program data mac frame in the memory block successively according to the row order.
The chnnel coding here can be the RS coding of variable bit rate, and transmitting terminal MAC layer can be determined according to the control information that radio resource control layer issues the concrete RS code rate that the program data mac frame adopts.The MAC layer can be carried on the RS code rate control information of program data mac frame in the frame head information of program stream mac frame, like this, MAC can carry out the RS coding according to the RS code rate control information in the mac frame frame head when the program data mac frame in the memory block being carried out the RS coding.
To step 340, when the mac frame in the memory block has carried out after the chnnel coding, transmitting terminal MAC layer need carry out each mac frame of storing in the memory block interweaving in the piece of memory block.Here, the mac frame that need carry out interweaving in the piece comprises: program data mac frame and verification mac frame.
To step 350, after having carried out interweaving in the piece, transmitting terminal MAC layer also needs the interblock degree of depth that each mac frame of storing in the memory block carries out between the memory block is interweaved.Equally, here, the mac frame that needs to carry out interweaving between memory block comprises program data mac frame and verification mac frame.
To step 360, the MAC layer in the piece, interblock interweave the back mac frame dispatch, so that the mac frame in the memory block after interweaving is mapped in the different timeslices, with the broadcast transmission several times of the mac frame in the memory block, from each memory block, read a mac frame as the MAC layer successively according to the poll order, then, the mac frame that once reads is mapped in a plurality of timeslices sends.The poll order here can for: according to the numeral order of memory block, and the MAC layer also can once read a plurality of mac frames from each memory block, and the mac frame quantity that once reads can be the integral multiple of memory block number.
In the foregoing description process, the programme information that transmitting terminal MAC layer sends present networks, the convergence flow bag that sends as convergence-level carries out the MAC framing, forms the program data mac frame.Mac frame encapsulation format among the present invention is as shown in table 1.
Table 1
| Frame head | Data field |
In the table 1, mac frame comprises two parts: mac frame frame head and data field.The length of whole M AC frame is 194 bytes, and wherein, the frame head length of program data mac frame is 6 bytes, and the data field length of program data mac frame is 188 bytes, has carried the convergence flow bag of various data types in the data field.
The frame head of program data mac frame is made up of 6 bytes, carries program identification information, flow identification information, channel coding rate information such as RS code rate information, mac frame check information etc., and the frame head of mac frame can also comprise the reservation position.The frame head form of program data mac frame is as shown in table 2.
Table 2
| ServiceID | StreamID | FECmode | ReservedBits | CRC-12 |
In the table 2, ServiceID is a program identification information, takies the 16bits bit wide; StreamID is a flow identification information, takies the 8bits bit wide; FECmode is a channel coding rate information, takies the 2bits bit wide, shows the code rate of the RS coding that the mac frame in the memory block adopts; ReservedBits takies the 10bits bit wide for keeping the position, and the reservation position of this 10bits temporarily keeps use; CRC-12 is the mac frame check information, takies the 12bits bit wide.
The code rate of above-mentioned RS coding comprises: RS (255,191,64), RS (255,207,48), RS (255,223,32) and four kinds of forms of RS (255,239,16).Channel coding rate information FECmode may be defined as following form:
When FECmode is " 00 ", expression RS (255,191,64);
When FECmode is " 01 ", expression RS (255,207,48);
When FECmode is " 10 ", expression RS (255,223,32);
When FECmode is " 11 ", expression RS (255,239,16).
CRC-12 can be defined as: g
CRC12(D)=D
12+ D
11+ D
3+ D
2+ D+1 is so that do cyclic redundancy check (CRC) to whole M AC frame.
Transmitting terminal MAC layer of the present invention is provided with a plurality of memory blocks for each program, and as for each program four to six identical memory blocks of size being set all, and the size of each memory block can be 255 * 194=49470 byte.
When the size of the memory block in the transmitting terminal MAC layer of the present invention was 255 * 194 (bytes), it was 194 byte MAC frames that memory block is used for storage frame length, and each memory block is divided into: information data district and checking data district.The MAC floor comes size for each memory block assignment information data field and checking data district according to the code rate signaling FECmode of radio resource control layer.
Transmitting terminal MAC layer according to RS (255, K, four kinds of code rate patterns R) are provided with the big or small as shown in table 3 of information data district in the memory block, checking data district.
Table 3
| FECmode(2bits) | Coded system | Information data district size (byte) | Checking data district size (byte) |
| 00 | RS(255，191，64) | 191*194 | 64*194 |
| 01 | RS(255，207，48) | 207*194 | 48*194 |
| 10 | RS(255，223，32) | 223*194 | 32*194 |
| 11 | RS(255，239，16) | 239*194 | 16*194 |
The process that transmitting terminal MAC layer carries out RS coding to the program data mac frame in each memory block as shown in Figure 4.
Among Fig. 4, transmitting terminal MAC layer can be stored in the program data mac frame of certain program in a plurality of memory blocks of this program according to the row storage order, and the left side memory block of Fig. 4 is according to the program data mac frame of row storage order storage.When the MAC layer carries out RS when coding to the program data mac frame in the memory block, be the row according to memory block carry out the RS coding in proper order, produce the verification mac frame.The verification frame that RS coding back produces is stored in the checking data district of Fig. 4 lower right side.
For the non-layered transmission mode, a plurality of memory blocks of each program can not distinguished in the transmitting terminal MAC layer, be that each memory block all is used for the programs stored elementary stream, at this moment, transmitting terminal MAC layer is that 194 byte MAC frames read in a plurality of memory blocks of this program successively according to the row storage order with length, if the program data mac frame that transmitting terminal MAC floor is once dispatched is not enough to fill the information data district of a plurality of memory blocks that expire this program, then in not filling the information data district of full memory block, fill predetermined mac frame as zero mac frame, the information data district of not filling full memory block is filled up.
Transmitting terminal MAC layer is after being stored in memory block according to the row storage order program data mac frame, the MAC layer carries out RS (255 according to the code rate signaling FECmode of this memory block in proper order according to row, K, R) coding, generating length is the verification mac frame of 194 bytes, and the MAC floor is stored in the verification mac frame that generates in the checking data district of this program storage piece.
For the Delamination Transmission pattern, the memory block of transmitting terminal MAC layer is divided into two classes, wherein a class memory block is used for the mac frame of programs stored elementary stream, another kind of memory block is used for the mac frame that programs stored strengthens code stream, be example with transmitting terminal MAC layer for certain program is provided with 4 memory blocks below, the storage of program data stream mac frame in the Delamination Transmission pattern is described.
Set this program 4 MAC layer memory blocks be numbered k, and the span of k is 0,1,2,3.Wherein, 0, No. 1 memory block can be used for the mac frame of programs stored elementary stream, and 0, No. 1 memory block can be called the elementary stream memory block; 2, No. 3 memory blocks are used for the mac frame that programs stored strengthens code stream, and 2, No. 3 memory blocks can be called enhancing code stream memory block.
Transmitting terminal MAC layer is divided into elementary stream and strengthens code stream according to the character of StreamID in the program data mac frame program data mac frame with each 194 byte length of this program.The mac frame of elementary stream is read in the information data district of 0, No. 1 memory block successively according to the row storage order, the mac frame that strengthens code stream is read in successively the information data district of 2, No. 3 memory blocks according to the row storage order.Transmitting terminal MAC floor carries out RS (255 according to the row order to the mac frame in the information data district according to the code rate signaling FECmode of No. 0 memory block, K, R) coding generates the verification mac frame of 194 bytes, and the verification mac frame is stored in the checking data district of No. 0 memory block.Transmitting terminal MAC floor adopts said method that the information data district of No. 1, No. 2, No. 3 memory block is carried out identical processing, describes no longer one by one at this.
In the foregoing description process, if the programme elementary stream mac frame that the MAC floor is once dispatched, program strengthen the elementary stream memory block that code stream MAC is not enough to fill expires this program, the information data district in the enhancing code stream memory block, then two class memory blocks are filled predetermined mac frame respectively as zero mac frame, so that 4 memory blocks of this program are filled up.
When transmitting terminal MAC layer interweaves to the mac frame in the memory block, be to be that the interframe that unit carries out interweaves with the mac frame, interframe interweaves specifically can comprise two steps, promptly interweave in the piece of memory block and memory block between interweave.
Below in conjunction with interweaving in the memory block piece of accompanying drawing to mac frame in the memory block, interweave between memory block and the specific implementation process of time slicing transmission describing.
Describing for convenient, is that 194 byte MAC frames carry out serial number to the length in each memory block at first, and that sets each mac frame in the memory block is numbered i and i=0～254.Set each program and be provided with k memory block, the value of k can be 0～5 here.Like this, the sequence number of the mac frame in k memory block is k-i, represents the 0th mac frame in the 0th memory block as 0-0.
Transmitting terminal MAC layer all carries out interweaving in the piece to the mac frame in each memory block of this program, and after k memory block carried out interweaving in the piece, according to the order of row storage, the sequence number of the mac frame in this memory block was: j
k=mod (31*i+k*64,255)
For the non-layered transmission mode, the specific implementation process that when transmitting terminal MAC layer is provided with four memory blocks for certain program, interweave in the piece of mac frame in the memory block, interblock interweaves and time slicing transmits as shown in Figure 5.
Among Fig. 5, four memory blocks are the elementary stream memory block.Transmitting terminal at first carries out interweaving in the piece of memory block, stores the mac frame after interweaving in the piece in four memory blocks of this program shown in Fig. 5 left side.Then, transmitting terminal MAC layer carries out interweaving between memory block to the mac frame unification in four elementary stream memory blocks of this program, that is to say, interweaves between memory block and carries out between four memory blocks.Store the mac frame after interblock interweaves in four memory blocks of this program shown in Fig. 5 middle column.At last, transmitting terminal MAC layer is once respectively read a mac frame according to the row storage order from four memory blocks of this program, and is mapped on the physical layer, sends by different timeslices.
For the Delamination Transmission pattern, when transmitting terminal MAC layer is provided with four memory blocks for certain program, be physical layer adjustment mode when being the Delamination Transmission pattern of 16QAM, interweave in the piece of mac frame in the memory block, interblock interweaves and the specific implementation process of time slicing transmission as shown in Figure 6.
Among Fig. 6, above two memory blocks be the elementary stream memory block, two following memory blocks are for strengthening the code stream memory block.Transmitting terminal at first carries out interweaving in the piece of memory block, stores the mac frame after interweaving in the piece in four memory blocks of this program shown in Fig. 6 left side.Then, transmitting terminal MAC layer carries out separately interweaving between memory block to the mac frame in two elementary stream memory blocks of this program, and the mac frames in two enhancing code stream memory blocks of this program are carried out separately interweaving between memory block.Store the mac frame after interblock interweaves in four memory blocks of this program shown in Fig. 6 middle column.At last, transmitting terminal MAC layer is once respectively read a mac frame according to the row storage order from two elementary stream memory blocks of this program, be mapped on the physical layer as elementary stream, by sheet transmission at the same time, transmitting terminal MAC layer is once respectively read a mac frame according to the row storage order from two enhancing code stream memory blocks of this program, be mapped on the physical layer as strengthening code stream, by sheet transmission at the same time.
For the Delamination Transmission pattern, when transmitting terminal MAC layer is provided with five memory blocks for certain program, be physical layer adjustment mode when being the Delamination Transmission pattern of 32QAM, interweave in the piece of mac frame in the memory block, interblock interweaves and the specific implementation process of time slicing transmission as shown in Figure 7.
Among Fig. 7, above two memory blocks be the elementary stream memory block, three following memory blocks are for strengthening the code stream memory block.Transmitting terminal at first carries out interweaving in the piece of memory block, stores the mac frame after interweaving in the piece in five memory blocks of this program shown in Fig. 7 left side.Then, transmitting terminal MAC layer carries out separately interweaving between memory block to the mac frame in two elementary stream memory blocks of this program, and the mac frames in three enhancing code stream memory blocks of this program are carried out separately interweaving between memory block.Store the mac frame after interblock interweaves in five memory blocks of this program shown in Fig. 7 middle column.At last, transmitting terminal MAC layer is once respectively read a mac frame according to the row storage order from two elementary stream memory blocks of this program, be mapped on the physical layer as elementary stream, send by the different time sheet, transmitting terminal MAC layer is once respectively read a mac frame according to the row storage order from three enhancing code stream memory blocks of this program, be mapped on the physical layer as strengthening code stream, send by the different time sheet.
For the Delamination Transmission pattern, when transmitting terminal MAC layer is provided with six memory blocks for certain program, be physical layer adjustment mode when being the Delamination Transmission pattern of 64QAM, interweave in the piece of mac frame in the memory block, interblock interweaves and the specific implementation process of time slicing transmission as shown in Figure 8.
Among Fig. 8, above two memory blocks be the elementary stream memory block, four following memory blocks are for strengthening the code stream memory block.Transmitting terminal at first carries out interweaving in the piece of memory block, stores the mac frame after interweaving in the piece in six memory blocks of this program shown in Fig. 8 left side.Then, transmitting terminal MAC layer carries out separately interweaving between memory block to the mac frame in two elementary stream memory blocks of this program, and the mac frames in four enhancing code stream memory blocks of this program are carried out separately interweaving between memory block.Store the mac frame after interblock interweaves in six memory blocks of this program shown in Fig. 8 middle column.At last, transmitting terminal MAC layer is once respectively read a mac frame according to the row storage order from two elementary stream memory blocks of this program, be mapped on the physical layer as elementary stream, send by the different time sheet, transmitting terminal MAC layer is once respectively read a mac frame according to the row storage order from four enhancing code stream memory blocks of this program, be mapped on the physical layer as strengthening code stream, send by the different time sheet.
Description by technique scheme as can be known, programme information in the transmitting terminal MAC layer memory block will be crossed over long transmitting time, as when program speed is 350Kbps, the time diversity ability of the numerous receivers of mobile TV can reach excellent time of reception diversity more than 3.5 seconds.
Also for each program is provided with a plurality of memory blocks, the quantity of the memory block of each program correspondence is decided according to the ability of mobile phone TV terminal in the MAC layer of mobile phone TV terminal of the present invention.The mobile phone TV terminal ability watches that with the mobile phone TV terminal support effect is relevant, and the implication of mobile phone TV terminal ability is as shown in table 4.
Table 4
| The mobile phone TV terminal ability | The MAC layer contains the memory block number | Memory block total capacity (Mbits) | The physical layer modulation mode of supporting |
| 1 | 4 | 1.58304 | Non-layered pattern: QPSK, 16QAM, 32QAM, 64QAM |
| Layered model: 16QAM |
| 2 | 5 | 1.9788 | Non-layered pattern: QPSK, 16QAM, 32QAM, 64QAM |
| Layered model: 16QAM, 32QAM | |||
| 3 | 6 | 2.37456 | Non-layered pattern: QPSK, 16QAM, 32QAM, 64QAM |
| Layered model: 16QAM, 32QAM, 64QAM |
Can know that by table 4 the mobile phone TV terminal ability can be divided into Three Estate.Because under the non-layered transmission mode, the MAC of mobile phone TV terminal only uses four memory blocks, and, these four memory blocks are not distinguished, all store the elementary stream mac frame, so the mobile phone TV terminal of these three ability ratings is all supported the non-layered transmission mode of all modulation systems of physical layer in the table 4.The Delamination Transmission pattern is then different, because the physical layer 16QAM modulation system under the Delamination Transmission pattern, 0, No. 1 memory block programs stored elementary stream mac frame of mobile phone TV terminal MAC floor, 2, No. 3 memory block programs stored strengthen the code stream mac frame, therefore, ability rating is that one, two, three mobile phone TV terminal is all supported this Delamination Transmission pattern.Because the physical layer 32QAM modulation system under the Delamination Transmission pattern, 0, No. 1 memory block programs stored elementary stream mac frame of mobile phone TV terminal MAC floor, 2,3, No. 4 memory block programs stored strengthen the code stream mac frame, therefore, ability rating is that two, three mobile phone TV terminal is supported this Delamination Transmission pattern.Because the physical layer 64QAM modulation system under the Delamination Transmission pattern, 0, No. 1 memory block programs stored elementary stream mac frame of mobile phone TV terminal MAC floor, 2,3,4, No. 5 memory block programs stored strengthen the code stream mac frame, therefore, having only ability rating is that three mobile phone TV terminal is supported this Delamination Transmission pattern.
The process of mobile phone TV terminal program receiving is the inverse process that above-mentioned transmitting terminal sends the process of program data stream, is not described in detail at this.
By top description as can be seen, the mobile phone TV terminal that ability rating is high more, the hierarchical modulation mode of support is many more, and, watch that the quality of program also will be high more.Like this, by changing the quantity of the memory block in the mobile phone TV terminal MAC layer, can adapt to elementary stream and the ratio that strengthens code stream under the different physical layer modulation modes.And, by the ability rating of definition mobile phone TV terminal, distribute more MAC layer memory block can for the mobile phone TV terminal of higher ability rating, guaranteed the time of reception diversity ability of high definition television broadcasting.
Time diversity provided by the invention system comprises: stores processor module, coding module, interleaving block and mapping block.
The stores processor module all is provided with a plurality of memory blocks for each program, the stores processor module with each program data mac frame separate storage in a plurality of memory blocks of this program.For the Delamination Transmission pattern, the quantity of the memory block of each program correspondence determined by programme attribute, and each program can corresponding four memory blocks or five memory blocks or six memory blocks; For the non-layered transmission mode, the quantity of the memory block of each program correspondence is fixed, as 4 memory blocks etc.Concrete as the description in the above-mentioned method.
Be provided with information data district and checking data district in each memory block, the program data mac frame is stored in the information data district of memory block, and the verification mac frame that coding module carries out after the chnnel coding is stored in the checking data district of memory block.The size in information data district and checking data district is determined by channel coding rate in each memory block.Concrete as the description in the above-mentioned method.
The stores processor module is made up of with the stores processor submodule that is positioned at transmitting terminal MAC layer the submodule that converges that is positioned at the transmitting terminal convergence-level.
Converge data flow that submodule is mainly used in the different-format that high level transmission is come and be encapsulated as the convergence flow bag of consolidation form, as IP stream packet, TS stream packet being converged convergence flow bag into consolidation form, then, converge submodule the convergence flow bag is transferred to the stores processor submodule.Concrete as the description in the above-mentioned method.
The stores processor submodule is mainly used in the convergence flow bag that it is received and carries out the MAC framing, and with each mac frame separate storage in a plurality of memory blocks of respective program.The stores processor submodule can be dispatched the convergence flow bag of each program in the MAC layer buffer area, and the convergence flow bag on the various logical channels is carried out the MAC framing handle, and forms the program data mac frame; Simultaneously, the public informations such as schedule information of each program are also carried out the MAC framing handle, form the public information mac frame.Stores processor is in the memory block that the program data mac frame is stored into this program the time, can according to the row storage order with each program data mac frame separate storage in a plurality of memory blocks.Wherein, the description in the form of the size of mac frame and mac frame such as the above-mentioned method.
Coding module is mainly used in to the mac frame in each memory block carries out chnnel coding, and the chnnel coding here can be encoded for RS.Coding module is stored in the verification mac frame behind the RS coding in the checking data district of memory block of this program.When coding module carries out the RS coding at the program data mac frame to memory block, can carry out the RS coding to the program stream mac frame in the memory block successively according to the row order, concrete as the description in the above-mentioned method.
Interleaving block is mainly used in the mac frame behind the coding is carried out interweaving between memory block, and the mac frame after interblock interweaved is stored in the memory block, in order further to strengthen the time diversity effect, interleaving block can also carry out interweaving in the memory block to the mac frame behind the program stream coding earlier, then, carry out again interweaving between memory block, and each mac frame after interblock interweaved is stored in the memory block of this program.Specific implementation process that interweave in the piece for Delamination Transmission pattern, non-layered transmission mode, interblock interweaves such as the description in the above-mentioned method.
Mapping block is mainly used in the mac frame after interblock interweaves in the memory block of a program is mapped in the physical layer at least one timeslice, and sends.Mapping block can read a mac frame respectively by the memory block number order successively from a plurality of memory blocks of a program, and is mapped at least one timeslice of physical layer, and sends.Concrete as the description in the above-mentioned method.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (21)
1, a kind of time diversifying method is characterized in that, described method comprises:
A, transmitting terminal with each mac frame separate storage of each program stream in a plurality of memory blocks;
B, transmitting terminal carry out chnnel coding for each mac frame in each memory block;
Each mac frame after c, transmitting terminal will be encoded carries out interweaving between memory block;
Each mac frame after d, transmitting terminal interweave interblock is mapped at least one timeslice, and sends.
2, a kind of time diversifying method as claimed in claim 1 is characterized in that, in the described method:
Under the non-layered transmission mode, the MAC layer of transmitting terminal all is provided with the memory block of fixed qty for each program; Perhaps
Under the Delamination Transmission pattern, the MAC layer of transmitting terminal is provided with memory block and this program corresponding physical layer hierarchical modulation mode of predetermined quantity for each program according to programme attribute.
3, a kind of time diversifying method as claimed in claim 2, it is characterized in that, under the Delamination Transmission pattern, the memory block of program stream comprises: the elementary stream memory block of storage elementary stream mac frame and storage strengthen the enhancing code stream memory block of code stream mac frame, and elementary stream memory block quantity, to strengthen code stream memory block quantity corresponding with the physical layer hierarchical modulation mode of this program.
4, a kind of time diversifying method as claimed in claim 3 is characterized in that, the corresponding relation of the physical layer hierarchical modulation mode of elementary stream memory block quantity, enhancing code stream memory block quantity and this program is:
Physical layer hierarchical modulation mode is: 16QAM Delamination Transmission pattern, and the ratio that the memory block quantity of programme elementary stream and program strengthen the memory block quantity of code stream is 1: 1; Perhaps
Physical layer hierarchical modulation mode is: 32QAM Delamination Transmission pattern, and the ratio that the memory block quantity of programme elementary stream and program strengthen the memory block quantity of code stream is 2: 3; Perhaps
Physical layer hierarchical modulation mode is: 64QAM Delamination Transmission pattern, the ratio that the memory block quantity of programme elementary stream and program strengthen the memory block quantity of code stream is 1: 2.
5, a kind of time diversifying method as claimed in claim 1, it is characterized in that, described memory block comprises: information data district and checking data district, and the mac frame of program stream is stored in the information data district of memory block, and the verification mac frame after the chnnel coding is stored in the checking data district of memory block.
6, a kind of time diversifying method as claimed in claim 5 is characterized in that, in the described method: the MAC floor of transmitting terminal is provided with the size in information data district and checking data district in the memory block according to the channel coding rate of mac frame.
7, a kind of time diversifying method as claimed in claim 1 is characterized in that, the frame head of mac frame comprises: program identification information, flow identification information, channel coding rate information, mac frame check information.
8, as the described a kind of time diversifying method of arbitrary claim in the claim 1 to 7, it is characterized in that described step a comprises:
The convergence-level of a1, transmitting terminal is encapsulated as the convergence flow bag with the data flow of the different-format of its reception, and the convergence flow bag is transferred to the MAC layer;
A2, MAC layer carry out the MAC framing with the convergence flow bag that receives, and with the mac frame separate storage in a plurality of memory blocks of respective program.
9, a kind of time diversifying method as claimed in claim 8 is characterized in that, the MAC layer comprises the step that the convergence flow bag that receives carries out the MAC framing among the described step a2:
The MAC layer is the program data mac frame with the convergence flow bag MAC framing on the logic channel, is the public information mac frame with the scheduling control information MAC framing of each program.
10, as the described a kind of time diversifying method of arbitrary claim in the claim 1 to 7, it is characterized in that, also comprise after the described step a:
When the mac frame of program stream does not fill up memory block, utilize predetermined mac frame that memory block is filled up.
11, as the described a kind of time diversifying method of arbitrary claim in the claim 1 to 7, it is characterized in that the chnnel coding among the described step b comprises: the RS coding.
As the described a kind of time diversifying method of arbitrary claim in the claim 1 to 7, it is characterized in that 12, the step of mac frame separate storage in a plurality of memory blocks comprises among the described step a:
Transmitting terminal MAC layer is stored in a plurality of memory blocks according to the mac frame of row storage order with each program stream;
And described step b comprises:
Transmitting terminal MAC layer carries out chnnel coding according to the row order to the mac frame in the memory block.
13, as the described a kind of time diversifying method of arbitrary claim in the claim 1 to 7, it is characterized in that described method also comprised before step c:
The mac frame of transmitting terminal MAC layer after with chnnel coding carries out interweaving in the memory block;
And described step c comprises:
After transmitting terminal MAC layer interweaves in memory block, the mac frame in each memory block is carried out interweaving between memory block;
To the Delamination Transmission pattern, the mac frame in this programme elementary stream memory block carries out separately interweaving between memory block, and the mac frame that this program strengthens in the code stream memory block carries out separately interweaving between memory block.
14, as the described a kind of time diversifying method of arbitrary claim in the claim 1 to 7, it is characterized in that described steps d comprises:
Transmitting terminal MAC layer reads a mac frame successively by round-robin order from a plurality of memory blocks of a program, and the mac frame quantity that once reads is the integral multiple of memory block number;
The mac frame that transmitting terminal MAC layer will once read is mapped at least one timeslice of physical layer.
15, a kind of time diversity system is characterized in that described system comprises: a plurality of memory blocks, stores processor module, coding module, interleaving block and mapping block;
Stores processor module: be used for each mac frame separate storage with each program stream in a plurality of memory blocks;
Coding module: be used to the mac frame in each memory block to carry out chnnel coding;
Interleaving block: be used for the mac frame behind the coding is carried out interweaving between memory block, and the mac frame after interblock interweaved is stored in the memory block;
Mapping block: the mac frame after being used for the memory block interblock interweaved is mapped at least one timeslice, and sends.
16, a kind of time diversity as claimed in claim 15 system, it is characterized in that, memory block comprises: information data district and checking data district, and the mac frame of program stream is stored in the information data district of memory block, and the verification mac frame that coding module carries out after the chnnel coding is stored in the checking data district of memory block.
17, a kind of time diversity as claimed in claim 15 system is characterized in that described stores processor module comprises: converge submodule and stores processor submodule;
Converging submodule is used for: the data flow of the different-format of its reception is encapsulated as the convergence flow bag, and the convergence flow bag is transferred to the stores processor submodule;
The stores processor submodule is used for: the convergence flow bag that receives is carried out the MAC framing, and with each mac frame separate storage in a plurality of memory blocks of respective program.
18, a kind of time diversity as claimed in claim 17 system is characterized in that:
Described stores processor submodule is stored in a plurality of memory blocks according to the mac frame of row storage order with each program stream;
Coding module carries out the RS coding according to the row order to the mac frame in the memory block.
19, as claim 15 or 16 or 17 or 18 described a kind of time diversity systems, it is characterized in that:
Interleaving block carries out the mac frame behind the program stream coding to interweave in the memory block, and after interweaving in carrying out memory block, interleaving block carries out interweaving between memory block, and each mac frame after interblock interweaved is stored in the memory block.
20, a kind of cell phone TV terminal device is characterized in that, described cell phone TV terminal device all is provided with a plurality of memory blocks at the MAC layer for each program;
When mobile phone TV terminal was supported the non-layered transmission mode, mobile phone TV terminal was stored in the programme elementary stream mac frame of its reception in a plurality of memory blocks of this program correspondence of MAC layer; Perhaps
When mobile phone TV terminal was supported the Delamination Transmission pattern, mobile phone TV terminal was stored in the programme elementary stream mac frame of its reception in the elementary stream memory block, and mobile phone TV terminal is stored in the program enhancing code stream mac frame of its reception in the enhancing code stream memory block.
21, a kind of cell phone TV terminal device as claimed in claim 20, it is characterized in that, mobile phone TV terminal is provided with the quantity of memory block in the mobile phone TV terminal MAC layer according to its ability rating, the program quality that the corresponding mobile phone TV terminal of described ability rating can be watched.
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| CN 200610075699 CN101052126A (en) | 2006-04-18 | 2006-04-18 | Time diversifying method, system and cell phone TV terminal device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104247543A (en) * | 2012-02-21 | 2014-12-24 | 瑞典爱立信有限公司 | Processing-time dependent control of data block transmission |
| CN110166976A (en) * | 2018-02-12 | 2019-08-23 | 中兴通讯股份有限公司 | Transmission mode determines method and device, storage medium and electronic device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104247543A (en) * | 2012-02-21 | 2014-12-24 | 瑞典爱立信有限公司 | Processing-time dependent control of data block transmission |
| CN110166976A (en) * | 2018-02-12 | 2019-08-23 | 中兴通讯股份有限公司 | Transmission mode determines method and device, storage medium and electronic device |
| US11343658B2 (en) | 2018-02-12 | 2022-05-24 | Zte Corporation | Method and device for determining transmission mode, storage medium and electronic device |
| US11706595B2 (en) | 2018-02-12 | 2023-07-18 | Zte Corporation | Method and device for determining transmission mode, storage medium and electronic device |
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