CN101047476B - Method and device for selecting modulation mode - Google Patents
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Abstract
A method for selecting modulation mode includes confirming priority level of data frame in service data and then selecting the corresponding modulation mode for data frame according to confirm priority level of data frame. The device used for realizing said method is also disclosed.
Description
Technical field
The present invention relates to the modulation technique of wireless communication field, particularly a kind of method and apparatus of selecting modulation mode.
Background technology
Supporting multicast and broadcast (MBS, Multicast and Broadcast Station) in the Ye Wu system, such as at World Interoperability for Microwave Access, WiMax (WiMAX, World Interoperability for MicrowaveAccess) in the system, allow base station (BS, Base Station) aloft interface is only broadcast a piece of data, specified portions or whole subscriber station/portable terminal (SS/MS, Subscriber Station/Mobile Station) receives, avoided the repeatedly transmission of air interface data, wherein broadcast mode is that the SS/MS that all is stationed can receive, and the multicast pattern only limits to add the SS/MS reception of multicast group.For realizing the MBS business, the SS/MS that BS is relevant with each sets up a descending connection, and in order to carrying MBS business, SS/MS does not distinguish the MBS business, and unification is handled according to unicast service.That is to say that BS only sends the business datum (SDU, Service Data Unit) of a MBS business, participate in this professional SS/MS by each and receive processing.Because each SS/MS may have different channel conditions, the also corresponding difference of its signal quality, on the other hand, the MBS business datum will send to SS/MS after ovennodulation.The modulation system that modulation efficiency is different, also different to the requirement of data quality, modulation system is high more, and just the bit number that comprises in modulation symbol is many more, and its modulation efficiency is just high more.Such as, 64 quadrature amplitude modulation (QAM, Quadrature AmplitudeModulation)-3/4 modulating-coding coefficient is 4.5, Quadrature Phase Shift Keying (QPSK, Quadrature PhaseShift Keying)-1/2 modulating-coding coefficient is 1, and promptly the modulation efficiency of 64QAM-3/4 is 4.5 times of QPSK-1/2.And modulation system is high more, such as using high order modulation, then the requirement to the data quality also becomes responsive more, those are owing to channel condition badly causes the unfavorable SS/MS of the quality of data, can increase error probability along with increasing of modulation efficiency separating timing, therefore, how to weigh modulation efficiency and error probability, reasonably select the modulation pattern of MBS business to become a major issue that realizes the MBS business.
At present, the method that has two kinds of selecting modulation modes.First kind is maximum method of reseptance, and second kind is the probability method of reseptance.Below these two kinds of methods are elaborated.
Method one
The target of method one is to make all SS/MS can receive this descending MBS business, so the process of this method is:
At first, BS writes down the MBS business that can select that all receive this business SS/MS.
Then, choose the modulation system that makes the professional normal lowest-order that receives of all MBS according to the MBS business of BS record.
At last, all MBS business are modulated, thereby guarantee that all SS/MS can receive based on the modulation system of the lowest-order of choosing.
For example there are 3 SS/MS receiving the MBS business, the high modulation mode that can receive is respectively: 64QAM-3/4, and 16QAM-1/2 and QPSK-1/2, in this case, BS can only use QPSK-1/2 to broadcast, and can receive these data to guarantee all SS/MS.
According to above process as can be seen, this method is selected the modulation system of low-order-modulated mode as whole MBS business, causes the wasting of resources easily.Because professional modulation system depends on the terminal that signal is the poorest, exist if be in the SS/MS of cell edge individually, BS will only can use the minimum QPSK-1/2 pattern of modulation efficiency, and so, under the most abominable situation, efficient reduces by 4.5 times.
Method two
The target of method two is not to make all SS/MS no matter its signal quality can receive, but only guarantee most of, such as: guarantee that the 95%SS/MS that receives this descending multicast service can correctly receive data, and require selecting modulation mode according to this.Therefore, method two is to choose according to the MBS business of BS record to guarantee the normal modulation system that receives of most of signal, and according to the modulation system of choosing all MBS business is modulated.
For example there are 100 SS/MS receiving the MBS business, the high modulation mode that can receive is: 64QAM-3/4,16QAM-1/2 and QPSK-3/4 have 45 respectively, 50 and 10, in this case, BS selects the modulation system of 16QAM-1/2 as the MBS business, to avoid the air-interface efficiency waste too many.
According to above process as can be seen, this method only under the relatively poor situation of minority SS/MS channel quality, relatively effectively, if but the channel quality of considerable part SS/MS is all relatively poor, still can not avoid selecting the low-order-modulated mode, cause the air interface resource waste.And the second-rate SS/MS of a few channels can't receive any data, no matter the quality quality.The modulation system of MBS business is selected and need base station equipment be had relatively high expectations according to the dynamic mapping of SS/MS channel quality.
By above analysis, during present as can be seen choice of technology modulation system, all there is the problem of the wasting of resources.
Summary of the invention
In view of this, the main purpose of the embodiment of the invention is to provide a kind of method of selecting modulation mode, and this method can reduce the wasting of resources.
Another purpose of the embodiment of the invention is to provide a kind of device of selecting modulation mode, and this device can reduce the wasting of resources.
For reaching above-mentioned first goal of the invention, the technical scheme of the embodiment of the invention specifically is achieved in that
A kind of method of selecting modulation mode, this method comprises:
According to the user's of receiving multicast traffic available high modulation demodulation mode, dynamically update the high modulation demodulation mode in the mapping relations of pre-configured Frame priority and modulation system;
Determine the priority of Frame in the cast service data; According to the priority and the described mapping relations of established data frame, Frame is selected to use corresponding modulation system.
For reaching above-mentioned second goal of the invention, the technical scheme of the embodiment of the invention specifically is achieved in that
A kind of device of selecting modulation mode, this device comprise priority determining unit and modulation system selected cell;
Described priority determining unit, be used for available high modulation demodulation mode according to the user of receiving multicast traffic, dynamically update the high modulation demodulation mode in the mapping relations of pre-configured Frame priority and modulation system, determine the priority of Frame in the cast service data, the priority of established data frame is input to the modulation system selected cell;
Described modulation system selected cell is used for priority and described mapping relations according to the cast service data Frame of determining, Frame is selected the modulation system of using.
As seen from the above technical solution, the method and apparatus of a kind of selecting modulation mode of the embodiment of the invention, in conjunction with source encoding, determine the priority of Frame in the business datum, the Frame of different priorities is selected to use different modulation systems, user experience can be improved on the whole, the wasting of resources can be reduced simultaneously.
Description of drawings
Fig. 1 is the schematic diagram that source encoding produces speech frame in the prior art;
The method flow schematic diagram of the selecting modulation mode that Fig. 2 provides for first embodiment of the invention;
The method flow schematic diagram of the selecting modulation mode that Fig. 3 provides for second embodiment of the invention;
Fig. 4 is the processing schematic diagram of three kinds of frame patterns of frame of video in the second embodiment of the invention;
Fig. 5 is a P field schematic diagram in the MPEG head;
Fig. 6 is NRI field schematic diagram in the son head H.264;
The apparatus structure schematic diagram of the selecting modulation mode that Fig. 7 provides for third embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The main thought of the embodiment of the invention is: the priority of determining Frame in the business datum; According to the priority of established data frame, Frame is selected the modulation system of the correspondence of use.
Below the present invention is described in detail for three embodiment:
Embodiment one:
The MBS business datum is Voice over IP (VOIP in the present embodiment, Voice Over IP), Frame in the business datum is a speech frame, source encoding is according to fixed intervals, produce speech frame such as 10ms, when not considering silence compression, each speech frame regular length 80bit, as shown in Figure 1, Fig. 1 is the schematic diagram that source encoding produces speech frame in the prior art.
Because, for user's audibility, not causing that voice quality has under the tangible reduction situation, maximum can allow the message dropping about 10%.So from this angle, 10% the voice message priority that 90% voice message and allowing is lost is discrepant, the latter can suitably use the high-order modulating than high bit-error.The method flow schematic diagram of the selecting modulation mode that Fig. 2 provides for first embodiment of the invention.Referring to Fig. 2, the method for selecting modulation mode may further comprise the steps:
Step 201:, determine the priority of speech frame in the business datum according to the statistics ratio.
Its concrete grammar is: according to the statistics ratio, and the speech frame in the picked at random business datum, the priority of the speech frame that setting is chosen.
In the present embodiment, pre-configured statistics ratio is 50% high priority, 40% medium priority and 10% low priority, be picked at random 50% speech frame, its priority is set to height, picked at random 40% speech frame, during priority was set to, the priority of other speech frame was set to low.
Then, according to the priority of the speech frame of determining, speech frame is selected the modulation system of use.
In the present embodiment, air interface is in carrying out the business datum process of transmitting, priority according to speech frame in the business datum, the speech frame of different priorities is selected to use different modulation systems, the speech frame that priority is the highest, need to guarantee that all users can receive, promptly choose the modulation system that can make all users receive.And,, then can select to use relative higher order or multistage modulation system because allow certain error rate for the lower speech frame of priority.
Step 202: the mapping relations of setting up speech frame priority and modulation system.
In the present embodiment, the mapping relations of Frame priority and modulation system are: the priority of the speech frame in the business datum is divided into height, neutralization is low, and the lowest modulation demodulation mode is QPSK, be that high speech frame uses QPSK to encode then to priority, the speech frame of priority in being uses 16QAM to modulate, and priority is that low speech frame uses 64QAM to modulate.
In the present embodiment, the mapping relations of speech frame priority and modulation system are pre-configured, and can adjust according to configuration parameter, for example can all be mapped to same modulation system to priority for the low speech frame of neutralization is unified.
Suppose that present embodiment adopts the multicast pattern, just only allow the SS/MS that adds the multicast group to receive business datum, system need receive the available high modulation demodulation mode of SS/MS according to current each, and dynamically updating priority is the modulation demodulation system that high speech frame uses.
Step 203:, the speech frame of different priorities is selected to use different modulation systems according to the mapping relations of speech frame priority and modulation system.
In this enforcement,,, select to use different modulation systems respectively to picked at random and be set to the speech frame of different priorities according to mapping relations.
As seen from the above-described embodiment, the embodiment of the invention produces the characteristics of speech frame in conjunction with source encoding, and according to the subjective feeling of user to voice, determine the priority of speech frame, and the different speech frame of priority is selected to use different modulation systems according to the priority of determining, thereby, can be in that reason such as relatively poor causes under the limited situation of transmission because of channel quality, improve user's impression, reduce the wasting of resources.
Embodiment two:
The MBS business datum is the multi-medium data that comprises audio frame and frame of video in the present embodiment, and wherein, frame of video comprises I frame, P frame and B frame.The method flow schematic diagram of the selecting modulation mode that Fig. 3 provides for second embodiment of the invention.Referring to Fig. 3, the flow process of this selecting modulation mode specifically may further comprise the steps:
Step 301:, determine the priority of Frame in the business datum according to the medium type of Frame.
In the present embodiment, because the bandwidth that video occupies is far longer than audio frequency, and abandons audio frame and can bring insufferable influence, so the priority of audio frame will be higher than the priority of frame of video to the user.Be that audio frame is preferentially selected low-order-modulated.
Step 302: the frame pattern of obtaining frame of video in the business datum.
In the present embodiment, in order to reduce redundant data, also can handle continuous images The data frame pattern as shown in Figure 3, Fig. 4 is the processing schematic diagram of three kinds of frame patterns of frame of video in the second embodiment of the invention.Referring to Fig. 4, the I frame utilizes the correlation compression of image self, and the random access point in the packed data stream is provided, and coding does not need the image of other frames for referencial use; The P frame utilizes encoder motion prediction, is the P frame that reference (forward prediction) obtains predicting with previous frame; The B frame is predicted by the former frame of present frame and the subsequent frame of present frame.That is to say that P frame and B frame are reference with the I frame all, the I frame is the basis of picture decoding, so decoding must begin with an I frame.If the I LOF also can not be used for normal decoder even later P frame of I frame or B frame exist, and must cause video flower screen when playing.
And the method for obtaining frame pattern information can directly be obtained according to the source encoding result, also can be according to real-time protocol (RTP) (RTP, Real Time Protocol) message obtains, in the present embodiment, according in Motion Picture Experts Group shown in Figure 5 (MPEG, Moving Picture Experts Group) the head to be used to identify be that the P field of I/B/P frame is obtained frame pattern information.
Step 303:, determine the priority of the frame of video that frame pattern is different in the business datum according to the frame pattern of frame of video.
In the present embodiment, because the I frame is the correlation compression that utilizes image self, P frame and B frame are to be reference with the I frame, so when haveing no alternative but frame losing, at first should abandon the B frame, next abandons the P frame, and the I frame will guarantee not lose as far as possible.When having only the I frame, have shake though play the end broadcasting pictures, still flower does not shield, and can guarantee the broadcast that the user is basic.That is to say that the priority that the I frame is set is higher than the priority of P frame and B frame, the priority of B frame will be lower than the P frame, and promptly the I frame data should use relative low-order-modulated mode as far as possible, and B frame and P frame can suitably use high-order modulating.
Step 304: the mapping relations of setting up Frame priority and modulation system.
In the present embodiment, the mapping relations of Frame priority and modulation system are: the priority of the Frame in the business datum be divided into the highest, inferior high, the neutralization low, and the lowest modulation demodulation mode is QPSK, then use QPSK to encode to the highest audio frame of priority, priority is modulated for the I frame in time high frame of video uses 16QAM, and priority uses 64QAM to modulate for neutralization low P frame and B frame.
In the present embodiment, the mapping relations of speech frame priority and modulation system are pre-configured, and can adjust according to configuration parameter, for example can be mapped to different modulation systems to priority for the low P frame of neutralization respectively with the B frame.
Suppose that present embodiment adopts broadcast mode, just whole SS/MS receives business datum, and therefore, system does not need to dynamically update the modulation demodulation system that priority is used for the highest audio frame.
Step 305:, the Frame of different priorities is selected to use different modulation systems according to the mapping relations of Frame priority and modulation system.
In this enforcement, the different audio frame of priority, I frame, P frame and B frame in the frame of video respectively according to mapping relations, are selected to use different modulation systems.
Except above-mentioned frame pattern information, can utilize other similar information in the RTP message, as the reference of judging message priority.For example, can use as shown in Figure 6 H.264 in the NRI field, when the NRI field when being 00, represent that this frame is not used in inter prediction encoding, even abandon, do not influence the decoding of other frame yet.Therefore, can its priority be set to lowly, can suitably use high-order modulating.
As seen from the above-described embodiment, the embodiment of the invention is in conjunction with the characteristics of three kinds of frame patterns of frame of video in the source encoding, and in conjunction with the subjective feeling of user to audio frequency and video, determine to comprise the priority of Frame in the multi-medium data of audio frame and frame of video, and select the modulation system used according to the priority of determining, thereby, can be in that reason such as relatively poor causes under the limited situation of transmission because of channel quality, improve user's impression on the whole, reduce the wasting of resources.
Embodiment three:
The apparatus structure schematic diagram of the selecting modulation mode that Fig. 7 provides for third embodiment of the invention, this device comprises priority determining unit 710 and modulation system selected cell 720;
Modulation system selected cell 720 is used for the priority according to the Frame of priority determining unit input, Frame is selected the modulation system of using.
Modulation system selected cell 720 can comprise mapping block 722 and select module 721; Wherein, mapping block 722 is set up the mapping relations of Frame priority and modulation system, the mapping relations of setting up is input to selects module 721; Select the mapping relations of module 721, the Frame of different priorities is selected to use different modulation systems according to the mapping block input.
The method of selecting modulation mode and device are applicable to the combination in any of the video data frame that speech data frame, video data frame and frame pattern are different among the invention described above embodiment, can select the modulation system of use to Frame.
The method of selecting modulation mode and device are not only applicable to the MBS business in the WiMAX system among the invention described above embodiment, also be applicable to the multicast/broadcast business (MBMS in other systems such as WCDMA system, Multimedia Broadcast/Multicast Service), also be applicable to point-to-point service (PTP, Point-To-Point) business that provides, Frame in the PTP business datum is selected to use and the corresponding modulation system of its priority, thereby play the effect that reduces the wasting of resources.
The method of selecting modulation mode and device are not only applicable to the WiMAX system among the invention described above embodiment, also are applicable in other radio broadcasting and the multicast system.The device of selecting modulation mode can be for equipment such as base station, base station controller or user terminals, such as the BS in the WiMAX system, SS/MS, and the RNC in the WCDMA system, UE etc.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the method for a selecting modulation mode is characterized in that, this method comprises:
According to the user's of receiving multicast traffic available high modulation demodulation mode, dynamically update the high modulation demodulation mode in the mapping relations of pre-configured Frame priority and modulation system;
Determine the priority of Frame in the cast service data; According to the priority and the described mapping relations of established data frame, Frame is selected the modulation system of use.
2. method according to claim 1 is characterized in that, the priority of Frame is determined according to the statistics ratio in the described business datum.
3. method according to claim 2, it is characterized in that, when the Frame in the described business datum is speech frame, according to the statistics ratio, the method of determining the priority of Frame in the business datum comprises: according to the statistics ratio, and the speech frame in the picked at random business datum; The priority of the speech frame that setting is chosen.
4. method according to claim 1 is characterized in that, the priority of Frame is to determine according to the medium type of Frame in described definite business datum.
5. method according to claim 4, it is characterized in that, when the Frame in the described business datum comprises audio frame and two kinds of medium types of frame of video, described medium type according to Frame, determine that the method for the priority of Frame in the business datum comprises: the priority of audio frame is set to be higher than the priority of frame of video.
6. method according to claim 1 or 5, it is characterized in that, when the Frame in the described business datum comprises frame of video, the method of the priority of Frame comprises in described definite business datum: according to the frame pattern of frame of video, determine the priority of the frame of video that frame pattern is different in the business datum.
7. method according to claim 6 is characterized in that, when the frame pattern of described frame of video comprises I frame, P frame and B frame, and described frame pattern according to frame of video, determine that the method for the priority of frame of video in the business datum comprises:
The priority of I frame pattern is set to be higher than the priority of P frame and B frame pattern, and the priority of B frame pattern is set to be lower than the priority of P frame pattern.
8. method according to claim 1, it is characterized in that, described priority and described mapping relations according to described Frame, select the method for the modulation system of use to comprise to Frame: to set up the mapping relations of Frame priority and modulation system, the Frame of different priorities is selected to use different modulation systems according to described mapping relations.
9. the device of a selecting modulation mode is characterized in that, this device comprises priority determining unit and modulation system selected cell;
Described priority determining unit, be used for available high modulation demodulation mode according to the user of receiving multicast traffic, dynamically update the high modulation demodulation mode in the mapping relations of pre-configured Frame priority and modulation system, determine the priority of Frame in the cast service data, the priority of established data frame is input to the modulation system selected cell;
Described modulation system selected cell is used for priority and described mapping relations according to the cast service data Frame of determining, Frame is selected the modulation system of using.
10. device according to claim 9 is characterized in that described priority determining unit comprises Executive Module and output module;
Described Executive Module, be used for according to the statistics ratio, determine the priority of Frame in the business datum or according to the medium type of Frame, determine the priority of Frame in the business datum or, determine the priority of frame of video in the business datum according to the frame pattern of frame of video;
Described output module is used for the priority of established data frame is input to the modulation system selected cell.
11. device according to claim 9 is characterized in that, described modulation system selected cell comprises mapping block and selects module;
Described mapping block is used to set up the mapping relations of Frame priority and modulation system, and the mapping relations of setting up are input to the selection module;
Described selection module is used for the mapping relations according to the mapping block input, and the Frame of different priorities is selected to use different modulation systems.
12. device according to claim 9 is characterized in that, described device is base station, user terminal or base station controller.
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| CN101646074B (en) * | 2008-08-05 | 2011-07-13 | 中兴通讯股份有限公司 | Real-time transmission method for video data |
| CN102970232B (en) * | 2012-11-21 | 2015-07-22 | 福建星网锐捷网络有限公司 | Method and device for sending low-speed STA (station) messages and access device |
| CN106559796B (en) | 2015-09-25 | 2020-04-17 | 上海诺基亚贝尔股份有限公司 | Communication device operating in unlicensed frequency band and method for implementing the same |
| CN105847182B (en) * | 2016-04-18 | 2019-11-15 | 武汉烽火众智数字技术有限责任公司 | A kind of audio-visual system sound intermediate frequency prioritised transmission method and its system |
| CN109151612B (en) | 2017-06-27 | 2020-10-16 | 华为技术有限公司 | Video transmission method, device and system |
| CN108702511A (en) * | 2017-07-28 | 2018-10-23 | 深圳市大疆创新科技有限公司 | Method, equipment and the system of transmission of video |
| CN110191470B (en) * | 2019-06-03 | 2022-05-03 | 武汉思普崚技术有限公司 | Method and corresponding system for security firewall |
| CN114826303B (en) * | 2021-12-21 | 2024-04-12 | 航天科工通信技术研究院有限责任公司 | Data demodulation system based on high priority frame |
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| CN1568620A (en) * | 2001-10-12 | 2005-01-19 | 皇家飞利浦电子股份有限公司 | Transmission of video using variable rate modulation |
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| CN1568620A (en) * | 2001-10-12 | 2005-01-19 | 皇家飞利浦电子股份有限公司 | Transmission of video using variable rate modulation |
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