CN102186147A - Multimedia broadcast and multicast service (MBMS) data stream transmission method, base station and user equipment (UE) - Google Patents
Multimedia broadcast and multicast service (MBMS) data stream transmission method, base station and user equipment (UE) Download PDFInfo
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Abstract
The invention discloses a multimedia broadcast and multicast service (MBMS) data stream transmission method, a base station and user equipment. The method comprises the following steps of: modulating a coded MBMS data stream in at least two modulation ways; and performing broadcast/multicast on the modulated MBMS data stream in a transmission way corresponding to each modulation way. In the invention, a novel MBMS service mode is put forward, and a multi-stage modulation way can be adopted, thereby fully utilizing wireless resources and making more flexible a broadcast/multicast service.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of MBMS data flow transmission method and base station and UE.
Background technology
Multimedia broadcast/multi broadcast business is counted as having very much a business of application scenarios in the wireless mobile communications field, its implementation is to have the contents such as digital audio/video of the intelligent terminal of video capability by the channel or the channel reception forms of broadcasting.Multimedia broadcast/multi broadcast business can be realized in radio network, also can realize in mobile communications network, and the latter's main advantage is to support multiple value-added service flexibly.The birth of MBMS (Multimedia Broadcast and Multicast Service, MBMS) makes supports that by mobile communications network multimedia broadcasting has become reality.MBMS is that 3GPP has just carried out standardized function in Release 6, is used to utilize the Radio Resource of 3G, provides multimedia broadcasting service to the user, also satisfies to the user simultaneously and carries out the multicast requirement that multimedia sends.
The transmission feature of MBMS business is the transmission of point to multiple spot, sends identical content to a plurality of reception users simultaneously from a content source.A plurality of receive directions to the reception of identical services, can be saved more air interface resource simultaneously.E-UTRAN (Evolved UTRAN, the UTRAN of evolution) can provide higher data rate, and lower time delay, and Packet Service optimized, these characteristics are except supporting point-to-point service, and be also more favourable for the support of the business of point-to-multipoint.
Fig. 1 is the MBMS frame of reference in EPS (grouping system of the Evolved Packet System evolution) system that provides among the 3GPP TS23.246 V9.5.0.MBMS business in the EPS system, the broadcast/multi broadcast data source that is provided by content supplier is at MCH (Multicast Channel, multicast channel) goes up use QPSK (Quadrature Phase Shift Keying, the quadrature frequency shift keying), 16QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation), single modulation system such as 64QAM and sending in an identical manner, the UE different for various performances will receive identical data with a kind of identical receiving mode under various wireless qualities.
As seen, in present technical scheme, all data sources that content supplier provides are used single modulation systems such as QPSK, 16QAM, 64QAM and are modulated transmission in the same way on MCH, and this single modulation system mainly contains following shortcoming:
1) owing to adopt single modulation system, can receive data, adopt and send the MBMS data in a like fashion, therefore can't take to cover flexibly according to different wireless qualities in order to realize most of UE;
2) according to the link budget result, for guaranteeing the reception of terminal traffic as much as possible, MBMS can only use the modulation system of relative low order that the broadcast/multi broadcast data are modulated, and following high definition etc. is needed the big signal transmission of stock number to solve to cover and the contradiction of program between transmitting.
Summary of the invention
The invention provides a kind of MBMS data flow transmission method and base station and UE, can make full use of Radio Resource, make broadcast/multi broadcast business more flexible.
The invention provides a kind of multimedia broadcast multi-broadcasting business MBMS data flow transmission method, comprising:
Adopt at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding;
Adopt and the corresponding send mode of each modulation system, the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
The present invention also provides a kind of multimedia broadcast multi-broadcasting business MBMS data flow method of reseptance, comprising:
User terminal UE receives the MBMS data flow of Web broadcast/multicast;
When UE determines that the MBMS data flow adopts at least two kinds of modulation systems,, press exponent number order from low to high, the MBMS data flow is carried out demodulation step by step according to the exponent number that modulation system adopts.
The present invention also provides a kind of base station, comprising:
Modulating unit adopts at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding;
Transmission unit is used for adopting and the corresponding send mode of each modulation system, and the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
The present invention also provides a kind of user terminal, comprising:
Receiving element is used to receive the MBMS data flow of Web broadcast/multicast;
Demodulating unit when being used for determining that the MBMS data flow adopts at least two kinds of modulation systems, according to the exponent number that modulation system adopts, is pressed exponent number order from low to high, and the MBMS data flow is carried out demodulation step by step.
Utilize MBMS data flow transmission method provided by the invention and base station and UE, has following beneficial effect: owing to proposed a kind of new MBMS business model, can adopt multistage modulation system, thereby can make full use of Radio Resource, make broadcast/multi broadcast business more flexible.
Description of drawings
Fig. 1 is the MBMS service transmission system Organization Chart in the EPS system;
Fig. 2 is a MBMS data flow transmission method flow chart in the embodiment of the invention;
The video file schematic diagram that Fig. 3 adopts classification QAM to broadcast different definition in different coverages for the embodiment of the invention;
Fig. 4 is a MBMS data flow transmission method of reseptance flow chart in the embodiment of the invention;
Base station and the user terminal structure figure of Fig. 5 for providing in the embodiment of the invention;
Fig. 6 is a 64QAM hierarchical modulation planisphere.
Embodiment
Below in conjunction with drawings and Examples MBMS data flow transmission method provided by the invention and base station and UE are illustrated in greater detail.
The embodiment of the invention has proposed a kind of new MBMS business model, and as shown in Figure 2, the MBMS data flow transmission method that the embodiment of the invention provides specifically comprises:
Step S201 adopts at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding;
For the MBMS data that will carry out broadcast/group broadcast,, need encode to the MBMS data usually to receiving the correct reception of data in order to realize receiving terminal, as carry out Turbo coding etc., make the data behind the coding have error-correcting performance.
Step S202 adopts and the corresponding send mode of each modulation system, and the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
The embodiment of the invention is for the MBMS data flow after encoding, no longer as prior art, unify also in an identical manner with single modulation system, but at least two kinds of modulation systems of sampling are modulated, and select corresponding manner to send according to modulation system, thereby can make full use of Radio Resource, make broadcast/multi broadcast business more flexible.
Provide the preferred implementation of the embodiment of the invention below.
Embodiment 1
To the MBMS data flow behind the coding of same business, adopt at least two kinds of modulation systems to modulate respectively in the present embodiment; Adopt and the corresponding send mode of each modulation system, the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
For the MBMS business, if adopting a kind of modulation system modulates data, then may cause following situation: at center of housing estate, because the network coverage is better, UE can receive broadcast program, but moving along with UE, moved to the edge of sub-district as UE, because the decline of wireless quality, UE may not receive the broadcast data of equal in quality, has so just caused the interruption of user experience.
Adopt the mode of the embodiment of the invention, for identical MBMS data flow, modulate at least twice, and send with corresponding send mode.The overlay area difference of the MBMS data flow that the different modulating mode obtains; The exponent number of modulation system is high more, and the zone that is covered is relatively more little.Each regional UE can receive the broadcast/multi broadcast data in the sub-district thereby can make.
Preferably, the MBMS data flow behind the coding adopts two kinds of modulation systems to modulate.The exponent number of first modulation system is greater than the exponent number of second modulation system, the MBMS data flow coverage cell central area that obtains after the modulation of first modulation system, and the MBMS data flow that obtains after the modulation of second modulation system covers whole sub-district.At least two kinds of modulation systems comprise quadrature amplitude modulation QAM and quadrature frequency shift keying QPSK at least, and wherein the QAM modulation realizes by multistage QPSK modulation.
To the MBMS data flow of same business, adopt at least two kinds of coded systems to encode respectively in the present embodiment; Obtain the MBMS data flow for every kind of coded system coding, adopt the modulation system corresponding to modulate with this coded system.As for video file, can obtain clear high video image when adopting higher level code, can obtain the low video image of definition when adopting rudimentary coding.
Adopt above-mentioned modulation system can effectively solve the problem that signal covers.Since landform, launching tower height and factors such as power and receiver antenna, and the modulation of different modes may realize the transmission of zones of different is covered.Usually high-order modulating is used to cover the kernel service district.In the high-order modulating coverage, the low-order-modulated mode is always effective.In the zone that high-order modulating is difficult to cover, can provide to extend with the low-order-modulated mode to cover.For video file, adopt the low-order-modulated mode to modulate to the low video of definition, the high video of definition is adopted the high-order modulating modulation.When receiving terminal was in covering kernel service district, it can receive the high video file of definition, and when receiver terminal was in the service area edge, it can receive the low video file of definition.Figure 3 shows that the video file that adopts layering QAM in different coverages, to transmit different definition.
Thisly demodulate the different levels data characteristic according to the different radio quality, combine with the demand of the broadcast singal of the multiple definition of needs broadcasting, can well support: the preferable terminal of wireless signal can obtain the better image quality, and the relatively poor terminal of wireless quality can obtain resolution and hang down the picture quality of some.Thereby avoided in the prior art under the situation that wireless quality descends terminal can't receive the problem of continuous video frequency program.
Embodiment 2
The MBMS of two-way at least data flow to behind the coding relevant with same business adopts a kind of modulation system to modulate to every road MBMS data flow, and the modulation system difference of each road MBMS data flow; Adopt and the corresponding send mode of each modulation system, the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
Preferably, the data flow of two-way MBMS at least to relevant with same business adopts a kind of coded system to encode to every road MBMS data flow, and the coded system difference of each road MBMS data flow; Obtain the MBMS data flow for every kind of coded system, adopt the modulation system corresponding to modulate with this coded system.
For example for video file, montage for high-resolution video file, can adopt low-resolution video coding back to adopt the low-order-modulated mode to be broadcast to all users in the sub-district, and for high-resolution video file, encrypting the back adopts high-order modulating to send, the user can freely receive the video file montage of low resolution, understand the general content of video file, if but want to receive high-resolution video file, then must be to operator's paid subscription, the high-resolution video file after after operator is authorized, just receiving encryption.
Embodiment 3
For the MBMS data flow behind the coding of different business, adopt a kind of modulation system to modulate to each professional MBMS data flow, and the modulation system difference of the MBMS data flow that each is professional, adopt and the corresponding send mode of each modulation system, the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
Preferably,, adopt a kind of coded system to encode to each professional MBMS data flow for the MBMS data flow of different business, and the coded system difference of each professional MBMS data flow; Obtain the MBMS data flow for every kind of coded system, adopt the modulation system corresponding to adjust with this coded system.
The professional employing of some MBMS low-order-modulated mode then can satisfy the user and receive requirement, the professional employing of some MBMS high-order modulating then can satisfy the user and receive requirement, then the professional different modulating mode that adopts of different MBMS is modulated, made full use of Radio Resource.
For what the above embodiment of the present invention provided the MBMS data flow is carried out the coding of different modes, thereby make MBMS be in the different coding layer, MBMS data to the different coding layer are carried out the different modulating mode, thereby different data source hierarchical modulation and different wireless quality correspondences, thereby can make full use of Radio Resource, make broadcast/multi broadcast business more flexible, to adopt QAM modulation technique and QPSK modulation technique is example, provides below in the preferred embodiment of the present invention to combine with many grades method for video coding of AVS1-P7 by classification QAM modulation technique.
The AVS standard is the digital audio/video coding standard that digital audio/video encoding and decoding technique standard operation group (AVS working group) is formulated.The AVS standard comprises 9 parts, and its 7th part is the mobile video coding standard.Be called AVS-M or AVS1-P7.The main feature of AVS-M video is that application target is clear and definite, and technology is targeted.It is a video encoding standard towards next-generation mobile communications.Can be applicable to mutual medium, broadband video service, multimedia mail, MSPN (Multimedia Services on Packet Networks, the multimedia service of packet network), real time communication business (video conference, video telephone etc.), monitoring remote video etc.
AVS1-P7 is primarily aimed at low code check, low complex degree, uses than the mobile media of low image resolution.AVS1-P7 has stipulated the video-frequency compression method of multiple bit rate, resolution and quality.AVS1-P7 has defined a benchmark class.The benchmark class is supported 9 ranks: 1.0,1.1,1.2,1.3,2.0,2.1,2.2,3.0 and 3.1.Table 1 is depicted as each rank corresponding parameters restriction.Table 2 is depicted as each rank frame per second relation corresponding with video format.9 ranks of AVS1-P7 definition support 64Kbit/s to the Maximum Bit Rate between the 8Mbit/s respectively as can be seen from Table 1.As can be seen from Table 2, AVS1-P7 supports the video format of multiple different resolution.
9 other parameter limit of level among table 1 AVS1-P7
Table 2 rank concerns with the frame per second of corresponding video format
The coded system that the MBMS data flow adopts has two kinds at least, adopt at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding, specifically comprise: obtain the MBMS data flow for every kind of coded system coding, as the video flowing of different frame per second, adopt the modulation system corresponding to modulate with this coded system.
In the MBMS business, present embodiment adopts classification QAM modulation technique, with the video file of different modulation system transmission through the AVS1-P7 coding of different stage.With classification 64QAM modulation technique is example, at the input terminal of low-order-modulated device, and the video data of the little resolution of the low level coding of input by AVS1-P7, for example video of the SQCIF form of 128 * 96 resolution by 1.0 grades of other AVS1-P7 codings.At the input terminal of higher order modulator, the video data of the big resolution of the high-level coding that pass through AVS1-P7 that input is encrypted, for example video of the VGA form of 640 * 480 resolution of encoding by 3.0 grades of other AVS1-P7.Like this, the user can freely receive the video file of low resolution, if but want to receive high-resolution video file, then must be to operator's paid subscription, the high-resolution video file after after operator is authorized, just receiving encryption.
The embodiment of the invention is corresponding with a plurality of code level of AVS1-P7 by classification QAM modulation technique, with the disclosed little resolution video file of low-order-modulated technology modulation by AVS1-P7 low level coding, with the big resolution video file that passes through the high-level coding of AVS1-P7 that high order modulation technology modulation is encrypted, can well solve the contradiction between the promoting service and service billing among the MBMS.
The embodiment of the invention also provides a kind of multimedia broadcast multi-broadcasting business MBMS data flow method of reseptance, as shown in Figure 4, specifically comprises, comprising: step S401, user terminal UE receive the MBMS data flow of Web broadcast/multicast; When step S402, UE determine that the MBMS data flow adopts at least two kinds of modulation systems,, press exponent number order from low to high, the MBMS data flow is carried out demodulation step by step according to the exponent number that modulation system adopts.
For the base station, data flow under the multiple modulation system can be sent simultaneously in separately mode, therefore after needing receiving terminal to receive the MBMS data flow, press exponent number order from low to high, the MBMS data flow is carried out demodulation step by step, exponent number is low more, the success rate of demodulation is big more, deduct the signal that the signal that demodulates obtains not demodulation with the data flow that receives, be demodulated to afterbody more step by step, and the MBMS data flow that demodulates is decoded.
Based on same inventive concept, a kind of base station and user terminal also are provided in the embodiment of the invention, because these base stations are similar with method of reseptance to a kind of MBMS data flow transmission with the principle that user terminal is dealt with problems, therefore the enforcement of these base stations and user terminal can repeat part and repeat no more referring to the enforcement of method.
The base station that the embodiment of the invention provides comprises:
Modulating unit adopts at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding;
Transmission unit is used for adopting and the corresponding send mode of each modulation system, and the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
Preferably, described modulating unit specifically is used for the MBMS data flow behind the coding of same business, adopts at least two kinds of modulation systems to modulate respectively; Or
The MBMS of two-way at least data flow to behind the coding relevant with same business adopts a kind of modulation system to modulate to every road MBMS data flow, and the modulation system difference of each road MBMS data flow; Or
For the MBMS data flow behind the coding of different business, adopt a kind of modulation system to modulate to each professional MBMS data flow, and the modulation system difference of each professional MBMS data flow.
Preferably, the coded system that the MBMS data flow adopts has two kinds at least, and described modulating unit specifically is used for obtaining the MBMS data flow for every kind of coded system coding, adopts the modulation system corresponding with this coded system to modulate.
When the MBMS data flow that described transmission unit obtains modulation is carried out broadcast/multi broadcast, the overlay area difference of the MBMS data flow that the different modulating mode obtains; The exponent number of modulation system is high more, and the zone that is covered is relatively more little.
Modulating unit is realized the mode of multiple modulation, can directly use a plurality of modulators, and each modulator is realized a kind of modulation.Preferably, above-mentioned at least two kinds of modulation systems comprise quadrature amplitude modulation QAM and quadrature frequency shift keying QPSK at least.QAM is because of its availability of frequency spectrum height, and advantages such as strong interference immunity are widely used in the modulation of mobile communication signal.The QAM signal can be regarded the linear combination of QPSK signal as, so the QAM modulation can realize by multistage QPSK modulation.
Preferably, the base station also comprises coding unit, is used for the MBMS data flow is encoded.
The embodiment of the invention also provides a kind of user terminal, comprising: receiving element is used to receive the MBMS data flow of Web broadcast/multicast; Demodulating unit when being used for determining that the MBMS data flow adopts at least two kinds of modulation systems, according to the exponent number that modulation system adopts, is pressed exponent number order from low to high, and the MBMS data flow is carried out demodulation step by step.
Preferably, user terminal also comprises decoding unit, and the MBMS data flow that is used for every grade of demodulation is obtained is decoded.
Be example to adopt two kinds of modulation systems below, provide the preferred implementation of embodiment of the invention base station and user terminal, as shown in Figure 5,
An input terminal DATA1 is connected to first data signal source, and the second input terminal DATA2 is connected to second data signal source.First data signal source and second data signal source can be represented the MBMS data of same business, or the expression MBMS data relevant with same business; Or the MBMS data of expression different business.
The sub-DATA1 of first input end is connected to the input terminal of first encoder 102, and the lead-out terminal of first encoder 102 is connected to the input terminal of first modulator 104, and first modulator 104 adopts the QPSK modulation system.The lead-out terminal of first modulator 104 is connected to first input end of signal combiner 106.
The second input terminal DATA2 is connected to the input terminal of second encoder 108.The lead-out terminal of second encoder 108 is connected to the input terminal of second modulator 110, and second modulator 110 adopts the 64QAM modulation system.The lead-out terminal of second modulator 110 is connected to the input terminal of the variable gain amplifier 111 with gain G.The lead-out terminal of variable gain amplifier 111 is connected to second input terminal of signal combiner 106.The lead-out terminal of signal combiner 106 produces the modulation signal of combination and is connected to transmission channel 200.
The output of transmission channel 200 is connected to the input terminal of first demodulator 302, and the demodulation mode that first demodulator 302 adopts is QPSK.The lead-out terminal of first demodulator 302 is connected respectively to the input terminal and the delay circuit 306 of first decoder 304.The lead-out terminal of first decoder 304 is connected to the input terminal of the lead-out terminal DATA1 ' and second encoder 308.The lead-out terminal of second encoder 308 is connected to the subtrahend input of subtracter 310.The lead-out terminal of delay circuit 306 is connected to the minuend input terminal of subtracter 310.Difference output end of subtracter 310 is connected to the input terminal of second decoder 312.The lead-out terminal of second decoder 312 is connected to the sub-DATA2 ' of second data output end.
Figure 6 shows that the non-homogeneous modulation constellation of typical 64QAM that Fig. 5 produces.This modulation signal is divided into two-layer, and the QPSK signal and the second layer that ground floor adopts the APSK modulation to obtain adopt 62QAM to modulate the 64QAM signal that obtains.The data of 104 pairs of input terminal DATA1 inputs of first modulator are finished the QPSK mapping, and the data of 104 pairs of input terminal DATA2 inputs of second modulator are finished the 64QAM mapping.Certainly, second layer 64QAM signal also can be realized with the mode of first modulator 104 with the modulator that adopts the 16QAM cascade.Be used for terminal and can select all to receive or receive only the code stream that the low-order-modulated mode obtains according to self-demand and condition of acceptance.
The described classification QAM of embodiment of the invention transmission technology is to realize by the classification QAM system with two data inputs.Then in practice, can expand, for example have the classification QAM system of three data inputs, can carry out three layers of modulation according to real needs.For example, at first carry out QPSK one time, on the basis of the constellation point that obtains, carry out QPSK again one time then, on the constellation point that the second time, QPSK obtained, carry out a QPSK modulation at last again for 64QAM.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
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 (12)
1. a multimedia broadcast multi-broadcasting business MBMS data flow transmission method is characterized in that, comprising:
Adopt at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding;
Adopt and the corresponding send mode of each modulation system, the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
2. the method for claim 1 is characterized in that, adopts at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding, specifically comprises:
To the MBMS data flow behind the coding of same business, adopt at least two kinds of modulation systems to modulate respectively; Or
The MBMS of two-way at least data flow to behind the coding relevant with same business adopts a kind of modulation system to modulate to every road MBMS data flow, and the modulation system difference of each road MBMS data flow; Or
For the MBMS data flow behind the coding of different business, adopt a kind of modulation system to modulate to each professional MBMS data flow, and the modulation system difference of each professional MBMS data flow.
3. the method for claim 1 is characterized in that, the coded system that the MBMS data flow adopts has two kinds at least, adopts at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding, specifically comprises:
Obtain the MBMS data flow for every kind of coded system coding, adopt the modulation system corresponding to modulate with this coded system.
4. the method for claim 1 is characterized in that, when the MBMS data flow that modulation is obtained is carried out broadcast/multi broadcast, and the overlay area difference of the MBMS data flow that the different modulating mode obtains; The exponent number of modulation system is high more, and the zone that is covered is relatively more little.
5. method as claimed in claim 4, it is characterized in that, MBMS data flow behind the coding adopts two kinds of modulation systems to modulate, wherein the exponent number of first modulation system is greater than the exponent number of second modulation system, the MBMS data flow coverage cell central area that obtains after the modulation of first modulation system, the MBMS data flow that obtains after the modulation of second modulation system covers whole sub-district.
6. as the arbitrary described method of claim 1～5, it is characterized in that described at least two kinds of modulation systems comprise quadrature amplitude modulation QAM and quadrature frequency shift keying QPSK at least, wherein the QAM modulation realizes by multistage QPSK modulation.
7. a multimedia broadcast multi-broadcasting business MBMS data flow method of reseptance is characterized in that, comprising:
User terminal UE receives the MBMS data flow of Web broadcast/multicast;
When UE determines that the MBMS data flow adopts at least two kinds of modulation systems,, press exponent number order from low to high, the MBMS data flow is carried out demodulation step by step according to the exponent number that modulation system adopts.
8. a base station is characterized in that, comprising:
Modulating unit adopts at least two kinds of modulation systems to modulate to the MBMS data flow behind the coding;
Transmission unit is used for adopting and the corresponding send mode of each modulation system, and the MBMS data flow that modulation obtains is carried out broadcast/multi broadcast.
9. base station as claimed in claim 8 is characterized in that, described modulating unit specifically is used for the MBMS data flow behind the coding of same business, adopts at least two kinds of modulation systems to modulate respectively; Or
The MBMS of two-way at least data flow to behind the coding relevant with same business adopts a kind of modulation system to modulate to every road MBMS data flow, and the modulation system difference of each road MBMS data flow; Or
For the MBMS data flow behind the coding of different business, adopt a kind of modulation system to modulate to each professional MBMS data flow, and the modulation system difference of each professional MBMS data flow.
10. base station as claimed in claim 8, it is characterized in that, the coded system that the MBMS data flow adopts has two kinds at least, and described modulating unit specifically is used for obtaining the MBMS data flow for every kind of coded system coding, adopts the modulation system corresponding with this coded system to modulate.
11. as the arbitrary described base station of claim 8～10, it is characterized in that, when the MBMS data flow that described transmission unit obtains modulation is carried out broadcast/multi broadcast, the overlay area difference of the MBMS data flow that the different modulating mode obtains; The exponent number of modulation system is high more, and the zone that is covered is relatively more little.
12. a user terminal is characterized in that, comprising:
Receiving element is used to receive the MBMS data flow of Web broadcast/multicast;
Demodulating unit when being used for determining that the MBMS data flow adopts at least two kinds of modulation systems, according to the exponent number that modulation system adopts, is pressed exponent number order from low to high, and the MBMS data flow is carried out demodulation step by step.
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| CN104871507A (en) * | 2012-12-21 | 2015-08-26 | 三星电子株式会社 | Method and apparatus for transmitting/receiving signal in communication system |
| CN105008004A (en) * | 2013-02-28 | 2015-10-28 | Lg电子株式会社 | Signal transmission and reception device and signal transmission and reception method |
| CN106341210A (en) * | 2015-07-13 | 2017-01-18 | 普天信息技术有限公司 | Multicast service resource allocation method and system |
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| CN106817335A (en) * | 2015-11-30 | 2017-06-09 | 华为技术有限公司 | A kind of Ditital modulation method and device |
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