CN104348566B - It is layered SFN network and its network-building method - Google Patents
It is layered SFN network and its network-building method Download PDFInfo
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Abstract
Present invention is disclosed one kind layering SFN network and its network-building method, the network structure to include multiple adjacent transmitting terminals, and its corresponding method comprises the following steps：The physical layer of each transmitting terminal is divided into synchronization and signalling pipes and at least two SFN pipelines, synchronizing symbol and common signaling are transmitted in synchronization and signalling pipes, SFN pipeline is divided into pipeline signaling and data pipe.Employ technical scheme, it is possible to achieve a kind of new physical layer dividing mode and resource distribution mode, so as to improve the flexibility of resource allocation, and reach the effect of the receiving ability and the quality of reception that improve signal overlapping region.
Description
Technical field
The present invention relates to one kind broadcast with receiving mode, more specifically to a kind of based on layering single-frequency network technology
System and its method for networking.
Background technology
When setting up Television Broadcasting Network, if two adjacent transmitting terminals on same frequency simultaneously transmission signal, can cause
Interfere.A kind of solution method is that two adjacent transmitting terminals are provided in networking without using same frequency, and in different frequencies
Stagger transmission signal on point.Such networking side is referred to as multiple frequency network, MFN（MFN）, it is clear that this mode wastes a large amount of frequency spectrums.
With the continuous development of broadcast technology, there is referred to as SFN（SFN）Networking technology.In SFN network
Each emitter is in synchronous regime, and with identical frequency, identical signal is sent identical at the time of.In these emitter institutes
In the range of covering, receiver can stably receive broadcast program.But single-frequency network technology is there is also following problem, when two phases
When adjacent area or city need to broadcast different programs, a city cannot use the frequency that another city has used.
Larger frequency spectrum resource is will also result in this case to waste.
With the continuous pursuit of the raising to efficiency of transmission, can utilization space diversity to improve the MIMO of efficiency of transmission
Technology becomes the focus of research.But there is also a series of problem for the actual performance and Project Realization that MIMO is received.
The content of the invention
The purpose of the present invention aims to provide a kind of layering SFN network and its network-building method, to solve net in the prior art
The problem of network frequency resource utilization rate is not high, the conflict of the transmitting terminal frequency utilization of adjoining area.
According to above-mentioned purpose, implement layering SFN network of the invention, including multiple adjacent transmitting terminals, wherein each
The physical layer of transmitting terminal includes synchronous and signalling pipes and at least two SFN pipelines, and transmission is same in synchronous and signalling pipes
Step symbol and common signaling, SFN pipeline include pipeline signaling and data pipe.
Foundation above-mentioned purpose, implement a kind of network-building method of layering SFN of the present invention, including multiple adjacent transmittings
End, comprises the following steps：The physical layer of each transmitting terminal is divided into synchronization and signalling pipes and at least two single-frequency webmasters
Road, synchronizing symbol and common signaling are transmitted in synchronization and signalling pipes, SFN pipeline is divided into pipeline signaling and data
Pipeline.
According to above-mentioned principal character, common signaling includes the SFN pipeline method of salary distribution and basic configuration, pipeline signaling bag
The data pipe number of SFN pipeline, resource distribution mode and data pipe configuration where including it.
According to above-mentioned principal character, SFN pipeline and data pipe correspond to running time-frequency resource, and running time-frequency resource includes what is specified
Time slot, subcarrier, time/frequency source block.
According to above-mentioned principal character, adjacent two transmitting terminals include at least one identical SFN pipeline, SFN
Transmitting identical signal in pipeline.
According to above-mentioned principal character, adjacent two transmitting terminals include at least one identical SFN pipeline, in single-frequency
In webmaster road, one of transmitting terminal launches arbitrary signal, another transmitting spacing wave.
According to above-mentioned principal character, adjacent two transmitting terminals include at least one identical SFN pipeline, in single-frequency
In webmaster road, two transmitting terminals launch different not empty signals, and corresponding receiving terminal uses single antenna or multiple antennas, Dan Tian
Line options receive the SFN pipeline for launching identical signal, and multiple antennas receives the signal of all SFN pipelines.
Employ technical scheme, it is possible to achieve a kind of new physical layer dividing mode and resource distribution mode,
So as to reach the effect of the receiving ability and the quality of reception that improve signal overlapping region.
Brief description of the drawings
In the present invention, identical reference represents identical feature all the time, wherein：
Fig. 1 is the structure division schematic diagram of present invention layering SFN physical layer；
Fig. 2 is the modulation schematic flow sheet of transmitting terminal of the present invention；
Fig. 3 is the demodulation schematic flow sheet of receiving terminal of the present invention；
Fig. 4 a~Fig. 4 c are the first embodiment schematic diagrams of SFN network-building method；
Fig. 5 a~Fig. 5 c are second of embodiment schematic diagrams of SFN network-building method；
Fig. 6 is the third embodiment schematic diagram of SFN network-building method.
Embodiment
Technical scheme is further illustrated with reference to the accompanying drawings and examples.
The layering SFN network of the present invention is made up of several transmitting terminals, and wherein the quantity of transmitting terminal is two or two
More than, transmitting terminal mentioned here can be launching tower or other are a series of complete with data processing, encapsulation, coding, modulation etc.
The launch terminal of whole processing function.The receiving terminal that the present invention launches end signal for receiving does not require particularly, can appoint
What receiving terminal with single antenna or multiple antennas, including fixed equipment and mobile hand-held equipment, for example, television set, mobile phone,
Tablet personal computer etc..
Transmitting terminal
Physical layer is divided into public synchronization and signalling pipes by reference picture 1, each transmitting terminal in the same fashion,
And two or more SFN pipelines.Transmission synchronizing symbol and common signaling in public synchronization and signalling pipes,
Wherein synchronizing symbol is included to help the synchronous information of receiving terminal, common signaling to indicate how to distribute SFN pipeline,
Including the SFN pipeline method of salary distribution and basic configuration.Public synchronization and signalling pipes do not include data symbol.
Each transmitting terminal launches identical synchronizing symbol and common signaling in public synchronization and signalling pipes, in this portion
Traditional SFN is formed on sub-signal, here like synchronizing symbol and common signaling can also be equivalent to by same signaling
MISO technologies in several groups of outputs, such as DVB-T2 being obtained by Space Time Coding or space-frequency coding.
Each transmitting terminal according to identical or different mode by each SFN pipeline be divided into pipeline signaling with one or
Data pipe number, resource distribution mode and the pipe of SFN pipeline where multiple data pipes, wherein pipeline signaling include it
The information such as road configuration.Each SFN pipeline and each data pipe both correspond to some running time-frequency resources specified, for example specify
Time slot（Similar to CMMB）, some subcarriers, the time-frequency similar to the pipeline in DVB-T2 specified in each OFDM symbol
Resource block etc., this is not limited by the present invention.
Shown in Fig. 2 is the modulation flow of an emitter for providing layering SFN function, on the whole first to single-frequency
The signal stream transmitted in webmaster road is modulated, then plus the signal stream transmitted in public synchronization and signalling pipes, composition
The signal frame transmitted in layering SFN network, it comprises the following steps that shown.
First, data encapsulation, coding and symbol is carried out to the message bit stream comprising each program to map, it is each so as to obtain
The symbol stream of the data pipe of individual SFN pipeline.The present invention is not limited specific encapsulation, coding and mapping mode.
Secondly, the symbol stream of each data pipe is obtained into the symbol stream of each SFN pipeline by encapsulation combination, and
Pipeline signaling is inserted in the symbol stream of each SFN pipeline, pipeline signaling describes the data pipe that respective SFN pipeline includes
Road number, resource distribution mode, such as each data pipe include how many individual symbols, and the letter of data pipe configuration in this frame
Order, the respective modulation system of such as each data pipe, error correcting code code check.Life of the present invention for data pipe and pipeline signaling
This can be not construed as limiting using the method for DVB-T2 generation pipeline symbol stream and signaling, or other method into method.According to list
The instruction in frequency webmaster road, the symbol stream of some SFN pipelines do not include the symbol stream of any data pipe, are spacing wave（Or
Say be launch complete zero symbol）.
Then, public synchronization and signalling pipes are added in these SFN pipeline symbol streams, form signal one by one
Frame.Each signal frame is by a synchronizing symbol and common signaling, and several SFN pipelines composition.Synchronizing symbol provides
The synchronous signal of receiver is helped, and common signaling contains some information bits.Synchronizing symbol and common signaling can use
DVB-T2 framing form, this is not limited by the present invention.The information bit that common signaling includes indicates the OFDM of this frame
The FFT sizes of symbol, and have the method for salary distribution of dibit instruction SFN pipeline.
For example, when above-mentioned dibit is 00, represent there was only a SFN pipeline；When for 01 when, indicate two lists
Frequency webmaster road, first SFN pipeline account for the first half subcarrier of each OFDM symbol in this frame, second single-frequency webmaster
Road accounts for the later half subcarrier of each OFDM symbol in this frame；When for 10 when, indicate four SFN pipelines, first list
Frequency webmaster road accounts for the subcarrier of the preceding a quarter of each OFDM symbol in this frame, and second SFN pipeline is accounted in this frame
The subcarrier of second a quarter of each OFDM symbol, by that analogy；When for 11 when, indicate eight SFN pipelines,
First SFN pipeline accounts for the preceding eighth subcarrier of each OFDM symbol in this frame, and second SFN pipeline accounts for
Second eighth subcarrier of each OFDM symbol in this frame, by that analogy.
Finally, the symbol of each signal frame is respectively filled on corresponding subcarrier, and inserts pilot tone, for inserting for pilot tone
Enter and do not limited with the configuration mode present invention, thus obtained the signal stream of base band.
Receiving terminal
The present invention realizes the reception to being layered SFN network using common receiver can, and shown in Fig. 3 is to connect
The reception flow of receiving end, it includes 5 main steps：
Step S1：Public synchronization and signalling pipes of the receiving terminal first in the signal received synchronize；
Step S2：According to synchronized result, the resource distribution of SFN pipeline is obtained from common signaling,
Step S3：The pipeline signaling in different SFN pipelines is demodulated one by one, so as to obtain in each SFN pipeline
Data pipe number, resource distribution mode and data pipe configuration.
Step S4：According to the information in pipeline signaling, one or more data pipes of demodulation are solved required for selecting
Reconcile code,
Step S5：The program data required for user is obtained from data pipe.
Above-mentioned transmitting terminal and the structure of receiving terminal form the basic framework of present invention layering SFN network, in utilization
The network structure for the layering SFN stated, can form a variety of network-building methods, by single-frequency on two adjacent transmitting terminals
The utilization in webmaster road, traffic assignments and transmission can be neatly carried out on each SFN pipeline." phase of the present invention
It is adjacent " two transmitting terminals, refer to that coverage has two overlapping transmitting terminals, and " same " or " identical " SFN pipeline
Refer to what each transmitting terminal was partitioned on a physical layer, take the signal segment of identical running time-frequency resource.
Two adjacent transmitting terminals can have a variety of flexible in same SFN pipeline in layering SFN network
Service transferring mode, effect caused by the different methods of salary distribution to SFN pipeline is different, and for transmitting terminal and connects
The requirement of receiving end is also different, and the signal launched for non-conterminous two transmitting terminals in same SFN pipeline does not have then
Require.Illustrate the network-building method of present invention layering SFN below by 3 embodiments.
Embodiment 1
Shown in Fig. 4 a~4c is the transmitting end position and coverage of a layering SFN, wherein each circle represents one
The coverage of individual transmitting terminal, these transmitting terminals form a layering SFN, and adjacent two transmitting terminals are in identical
Transmitting identical signal in SFN pipeline, or one of transmitting terminal transmitting arbitrary signal, another transmitting spacing wave.
As shown in Figure 4 a ~ 4c, the physical layer of each transmitting terminal is divided into 3 SFN pipelines in an identical manner.
Need altogether to broadcast A, B, C, D, E and F, 6 different program sets, this 6 programs in the overlay area of this layering SFN
The coverage requirement of group is different.Shown in Fig. 4 a~4c is exactly the section for the layering SFN formulated according to these requirements
Mesh allocative decision, respectively defines which program set each transmitting terminal broadcasts respectively in SFN pipeline 1 to 3.
Fig. 4 a~4c have corresponded to SFN 1~SFN of pipeline pipeline 3 respectively, for example, the A identified in a circle is meant that
The corresponding transmitting terminal of this circle in the SFN pipeline broadcasts program set A, and if x is identified in a circle, with regard to table
Show that the corresponding transmitting terminal of this circle broadcasts spacing wave in the SFN pipeline.In SFN pipeline 1, transmitting terminal 1 and 3
And its some other transmitting terminals on periphery launch program set A, transmitting terminal 2 and its periphery other transmitting terminals transmitting program set B.
In SFN pipeline 2, some other transmitting terminals on transmitting terminal 1 and 2 and its periphery transmitting program set C, transmitting terminal 3 and its periphery
Other transmitting terminals transmitting program set D.In SFN pipeline 3, other transmitting terminals transmitting program set F on transmitting terminal 1 and its periphery,
Transmitting terminal 2 and 3 and its transmitting terminal on periphery transmitting program set E.The coverage of each program set it can be seen from Fig. 4 a~4c
It is different, and two transmitting terminals of arbitrary neighborhood will not interfere in 3 SFN pipelines.
Embodiment 2
The present embodiment is on the basis of embodiment 1, while broadcast, according to the Real-time Feedback or operator for receiving user
Actual demand, the coverage of program can be changed in real time.For example, by the statistics to user feedback, find to section
Mesh group A and D demand become big, and the less users of program set E receive, and program set B is then halted by operator, therefore utilize the present invention
Layering SFN network structure, real-time tune as shown in Fig. 5 a~5c can have been done to the program distribution for being layered SFN
It is whole.
Specifically, the transmitting terminal 2 for being compared to Fig. 4 a, Fig. 5 a starts broadcast program group A in SFN pipeline 1, and
And no longer broadcast program group B, other transmitting terminals on such transmitting terminal 1,2,3 and its periphery broadcast section in SFN pipeline 1
Mesh group A, that is, expand program set A coverage.
It is compared to for Fig. 4 b, the broadcasted content of Fig. 5 b transmitting terminal 1 in SFN pipeline 2 does not change,
But transmitting terminal 2 adds program set C broadcast coverage, and transmitting terminal 3 starts broadcast program group in SFN pipeline 2
E, no longer broadcast program group D.
It is compared to for Fig. 4 c, the broadcasted content of Fig. 5 c transmitting terminal 1 in SFN pipeline 3 does not change, but single
Frequency webmaster road 2 and 3 starts broadcast program group D, and no longer broadcast program group E, that is, expands program set D broadcasting area.
In general, Fig. 5 a~5c accordingly expand program set A and D coverage, by program set E from single-frequency webmaster
Road 3 moves on to SFN pipeline 2 and reduces coverage, no longer broadcast program group B.So, 3 single-frequency of 3 transmitting terminals are utilized
Webmaster road, it is possible to achieve flexible control and adjustment to program set broadcast coverage.
Embodiment 3
Assuming that there is three transmitting terminals in certain area, their coverage is as shown in Figure 6.Three transmitting terminals are identical
Frequency send program simultaneously, the physical layer of each transmitting terminal is divided into three SFN pipelines, three hairs in the same fashion
It is as shown in the table to penetrate the program launched in respective SFN pipeline at end.
As can be seen from the above table, two adjacent transmitting terminals launch different non-NULL letters in same SFN pipeline
Number, i.e., transmitting terminal 2 and transmitting terminal 3 form SFN, but the signal launched on SFN pipeline 2 and 3 on SFN pipeline 1
Content is different.Similarly, transmitting terminal 1 and transmitting terminal 2 form SFN on SFN pipeline 2, but on SFN pipeline 1 and 3
The signal content of transmitting is different.Especially, it is different for SFN pipeline 3, the program of each transmitting terminal transmitting.
As shown in fig. 6, in the coverage not overlapped with the coverage of transmitting terminal 2 of transmitting terminal 1, user can use
Single antenna reception is to program 1, program 4 and program 8.Overlapped in the coverage not with transmitting terminal 1 and transmitting terminal 3 of transmitting terminal 2
Coverage in, user can use single antenna reception to program 2, program 3, program 4, program 9 and program 10.In transmitting terminal 3
Not in the coverage overlapping with the coverage of transmitting terminal 2, user can with single antenna reception to program 2, program 3,
Program 5, program 6, program 7, program 11, program 12 and program 13.
The layering SFN network of the present embodiment has certain requirement, i.e. receiving terminal in signal overlapping region to receiving terminal
Different receptions can be produced using single antenna or multiple antennas.For the receiving terminal of single antenna, it can be in signal crossover region
Selection receives the SFN pipeline that two transmitting terminals launch identical signal in domain, and for the receiving terminal of multiple antennas, and it can be
The signal of all SFN pipelines of two transmitting terminals is received in signal overlapping region.
As shown in fig. 6, in transmitting terminal 1 and the crossover region of transmitting terminal 2, user can receive transmitting terminal 1 and transmitting with single antenna
Hold 2 jointly owned programs, i.e. program 4.User can also use antenna and receive transmitting terminal 1 using the MIMO modes demodulated
With all programs of transmitting terminal 2, i.e. program 1, program 2, program 3, program 4, program 8, program 9 and program 10.
Similarly, in transmitting terminal 2 and the crossover region of transmitting terminal 3, user can receive transmitting terminal 2 with single antenna and transmitting terminal 3 is common
With the program possessed, i.e. program 2 and program 3.User can also use multiple antennas and receive hair using the MIMO modes demodulated
Penetrate end 2 and transmitting terminal 3 all programs, i.e., program 2, program 3, program 4, program 5, program 6, program 7, program 9, program 10,
Program 11, program 12 and program 13.
For the common network architecture, crossover region user institute energy can be greatly improved using MIMO transmittings reception mode
The number of programs of reception, but the single-antenna subscriber of crossover region will be gainless.And the present invention is on this basis, layering SFN is used
Technology, the single-antenna subscriber of crossover region can be made can also receive partial programme, and for multiple antennas user, these programs
The quality of reception can also be improved.
SFN network-building method of the present invention, which is not limited in transmitting terminal two-by-two, the phenomenon of overlapping region, technology of the invention
Scheme, which may be equally applicable for 3 or more than 3, has overlapping region, i.e., the situation of adjacent transmitting terminal, it is for physical layer
Division it is identical, and the principle of network-building method is same as the previously described embodiments, and the network-building method of 3 transmitting terminals is with 2
Based on transmitting terminal, the present invention is not repeated explanation.
It will be understood to one skilled in the art that the specification of the above is only one kind in the numerous embodiments of the present invention
Or several embodiments, and not use limitation of the invention.Any equivalent change for embodiment described above, modification with
And the technical scheme such as equivalent substitute, as long as meeting the spirit of the present invention, will all fall in claims of the present invention
In the range of protecting.
Claims (10)
1. one kind layering SFN network, including multiple adjacent transmitting terminals, it is characterised in that：
The physical layer of each transmitting terminal includes synchronous and signalling pipes and at least two SFN pipelines, the synchronization and
Transmission synchronizing symbol and common signaling, the SFN pipeline include pipeline signaling and data pipe in signalling pipes, wherein, institute
Stating common signaling includes the SFN pipeline method of salary distribution and basic configuration,
Wherein, two adjacent transmitting terminals include at least one identical SFN pipeline, in the SFN pipeline, two
Transmitting terminal launches different not empty signals, and corresponding receiving terminal uses single antenna or multiple antennas, and the single antenna selection connects
The SFN pipeline of identical signal is penetrated in transmitting-receiving, and the multiple antennas receives the signal of all SFN pipelines.
2. layering SFN network as claimed in claim 1, it is characterised in that the pipeline signaling includes SFN where it
Data pipe number, resource distribution mode and the data pipe configuration of pipeline.
3. layering SFN network as claimed in claim 1, it is characterised in that the SFN pipeline and data pipe are corresponding
Running time-frequency resource, the running time-frequency resource include the time slot, subcarrier, time/frequency source block specified.
4. layering SFN network as claimed in claim 1, it is characterised in that two adjacent transmitting terminals include at least one
Identical SFN pipeline, the interior transmitting identical signal of the SFN pipeline.
5. layering SFN network as claimed in claim 1, it is characterised in that two adjacent transmitting terminals include at least one
Identical SFN pipeline, in the SFN pipeline, one of transmitting terminal launches arbitrary signal, the empty letter of another transmitting
Number.
6. a kind of network-building method for being layered SFN, including multiple adjacent transmitting terminals, it is characterised in that comprise the following steps：
The physical layer of each transmitting terminal is divided into synchronization and signalling pipes and at least two SFN pipelines, described
Transmission synchronizing symbol and common signaling, pipeline signaling and data pipe are divided into by the SFN pipeline in synchronous and signalling pipes
Road, wherein, the common signaling includes the SFN pipeline method of salary distribution and basic configuration,
Wherein, at least one identical SFN pipeline, in the SFN pipeline, two are selected in two adjacent transmitting terminals
Individual transmitting terminal launches different not empty signals, and corresponding receiving terminal uses single antenna or multiple antennas, the single antenna selection
The SFN pipeline for launching identical signal is received, the multiple antennas receives the signal of all SFN pipelines.
7. the network-building method of layering SFN as claimed in claim 6, it is characterised in that the pipeline signaling is included where it
Data pipe number, resource distribution mode and the pipeline configuration of SFN pipeline.
8. the network-building method of layering SFN as claimed in claim 6, it is characterised in that the SFN pipeline and data pipe
Road corresponds to running time-frequency resource, and the running time-frequency resource includes the time slot, subcarrier, time/frequency source block specified.
9. the network-building method of layering SFN as claimed in claim 6, it is characterised in that selected in two adjacent transmitting terminals
At least one identical SFN pipeline, identical signal is launched in the SFN pipeline.
10. the network-building method of layering SFN as claimed in claim 6, it is characterised in that selected in two adjacent transmitting terminals
At least one identical SFN pipeline is selected, in the SFN pipeline, one of transmitting terminal launches arbitrary signal, another
Individual transmitting spacing wave.
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| CN1988408A (en) * | 2006-11-29 | 2007-06-27 | 北京邮电大学 | Antenna circulation delay diversity method for small interval and transmitting and receiving device |
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