CN101610463B - Method for sending wireless data - Google Patents
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- CN101610463B CN101610463B CN2008101114678A CN200810111467A CN101610463B CN 101610463 B CN101610463 B CN 101610463B CN 2008101114678 A CN2008101114678 A CN 2008101114678A CN 200810111467 A CN200810111467 A CN 200810111467A CN 101610463 B CN101610463 B CN 101610463B
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Abstract
The invention discloses a method for sending wireless data, which comprises the following steps: A, coding a primary data packet and then dividing the primary data packet into a plurality of data segments; and B, mapping the data segments to different resources respectively, and sending the data in discontinuous time. The method can meet the requirement of terminals with different link qualities on receiving respective data quantity needing to be received only at the moment and processing the data; therefore, the method is favorable for saving the electric quantity of the terminal with good link quality. The sending mode is not only suitable for point-to-point service, but also more suitable for point-to-multipoint service.
Description
Technical field
The present invention relates to a kind of sending method of wireless data, relate in particular to the sending method of packet in MBMS (multimedia broadcasting and multicast) business.
Background technology
The transmission medium of radio communication is namely wireless channel, and more precisely, wireless channel is the propagation path between antenna for base station and user antenna.Antenna induction electric current and produce electromagnetic viscosimeter and give off electromagnetic wave, these electromagnetic waves be in free space or airborne spread, and received antenna is responded to and produced induced current at last.The electromagnetic wave propagation path may comprise that direct projection is propagated and non-direct projection is propagated, and the existence of multiple propagation path has caused the variation of wireless signal feature.
The fading characteristic of wireless channel depends on propagation environment of radio wave.Different environment, its propagation characteristic also is not quite similar.For example, one has the big city of many skyscrapers to compare with smooth open rural area, and its communication environments has a great difference, and both characteristics of radio channels are also variant greatly.And communication environments itself is very complex and changeable, and this just makes characteristics of radio channels is also very complicated.Complicated, abominable propagation conditions is the feature of wireless channel, and this is to determine by carrying out at the volley this mode of radio communication itself.
How to improve to greatest extent message transmission rate on limited bandwidth and in complicated wireless channel environment, namely how to improve to greatest extent band utilization efficient, become gradually the study hotspot of mobile communication.And link adaptation techniques (LA:Link Adaptation) is being just because of having very strong advantage aspect message transmission rate and the availability of frequency spectrum improving, thereby becomes at present and one of key technology of future mobile communication system.
Link adaptation techniques is generally for time domain at present.That is to say, the parameter of dynamically adjusting is mainly the time domain parameters such as modulation system, coded system.System becomes different codings with modulation mode combination several " MCS (Modulation and Coding Scheme Modulation and Coding Scheme) ", selects according to channel situation for system.User near the base station, have high-quality channel condition, the higher Modulation and Coding Scheme of rank (16 state quadrature amplitude modulation 16QAM for example will be assigned with, the Turbo code of 3/4 code check), interference free performance and the error correcting capability of this Modulation and Coding Scheme are relatively poor, to having relatively high expectations of channel quality, but can win higher data rate, improve the average data throughput of link.On the contrary, be in the user of cell boarder, channel fading is serious or have severe jamming and a noise, the rank that is assigned with is lower, has stronger error correcting capability, noise proof feature is the Modulation and Coding Scheme of Modulation and Coding Scheme (for example quaternary phase shift is modulated QPSK, the Turbo code of 1/2 code check) preferably, to guarantee the transmitting of data.The application of this technology is measured by terminal at present, reports to the base station, carries out unified scheduling by the base station, decides to each terminal to adopt what other MCS of level.But this technology only limits to unicast service, can not directly be suitable for for the MBMS business.
For the MBMS business, it is a point-to-multipoint particular service, different with unicast service, the base station can not come to be the suitable MCS of each terminal scheduling according to the link quality condition of each terminal, and need to consider all reliable receptions of all terminals that receive this MBMS service.Therefore, the MBMS business according to the link-quality situation of poor user, is formulated transmission rate in order to look after the user in whole MBMS service area; And consider the situation of SFN (Single FrequencyNetwork Single Frequency Network) or even formulate MCS with the link-quality situation of the poor user in whole SFN zone in LTE (long evolving system).All data that the terminal receiving end/sending end sends are carried out decoding and are processed, and obtain initial data.
Above-mentioned terminal has received all data that transmitting terminal sends, and this method can be brought too much reception redundant information for link-quality terminal preferably.For the problems referred to above, this method proposes a kind of sending method that is conducive to reduce the power consumption of the good terminal of link-quality.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of sending method of wireless data, to satisfy for the terminal that possesses different link-qualities, being convenient to optionally receive only needs the data volume that receives this moment and processes to get final product separately, so is conducive to save terminal power.
In order to address the above problem, the invention provides a kind of sending method of wireless data packet, comprising:
A: will be divided into a plurality of data segments after the initial data packet encoder;
B: each data segment is mapped to respectively discontinuous transmission in time on different resources.
Further, in described steps A, raw data packets is added the cyclic redundancy check (CRC) code CRC check, and carry out chnnel coding, the data after the coding that obtains being formed by information bit and check digit.
Further, in described steps A, the data after coding are interweaved, and respectively described information bit and check digit are reassembled as different data segments.
Further, the full detail position in the data that obtain after the initial data packet encoder is binned in a data segment.
Further, described each data segment, length equates.
Further, transmitting terminal is carried at the size of described raw data packets and resource mapping distribution situation in control information and issues.
Further, in described step B, leave the time interval between described data segment when mapping sends, the duration at described interval is completed the required duration of decoding one time more than or equal to receiving terminal.
Further, in described step B, each data segment is mapped to respectively OFDM symbol on different subframes or the different OFDM symbols discontinuous transmission in time on same subframe.
Compared with prior art, the present invention can satisfy the terminal of different link-qualities, and receiving only needs the data volume that receives this moment and process to get final product separately, so is conducive to save the good terminal power of link-quality, this send mode not only is suitable for the business of point-to-point, more is fit to point-to-multipoint service.
Description of drawings
Fig. 1 is method flow diagram in the embodiment of the present invention;
Fig. 2 is the schematic diagram that in the embodiment of the present invention, the individual data bag sends;
Fig. 3 is that in the embodiment of the present invention, the symbol in subframe forms schematic diagram;
Fig. 4 is the multiple step format mapping schematic diagram of a plurality of raw data packets in the embodiment of the present invention.
Embodiment
The drawback that the present invention exists in order to solve conventional solution is further set forth the sending method of a kind of wireless data of the present invention by following specific embodiment, below embodiment is described in detail, but not as a limitation of the invention.
Core thinking of the present invention is: to one or more raw data packets, carry out chnnel coding according to relatively low code check, again information bit and check digit are reassembled into a plurality of segmentations, the several data segments in these same raw data packets are sent at the interval in time.
As shown in Figure 1, be method flow diagram in the embodiment of the present invention.
Carry out chnnel coding according to lower code check, mainly because the MBMS business will consider that the link-quality of the terminal of diverse location in the residential quarter is different, in order to consider the accurate decoding of the terminal that link-quality is relatively poor, so adopt lower code check to carry out chnnel coding to data;
The process that interweaves is generally used in the prior art, does not repeat them here; Optimum interleaving scheme can interweave to information bit and check digit separately, so that the back is easily found information bit and check digit again during segmentation.
, carry out segmentation again for the data after coding herein, optimum segmentation scheme: keep all information bits continuous, and divide in same section, each data segment that is divided into (S section, P1 section and P2 section) length is consistent; The segmentation scheme of suboptimum: keep the overwhelming majority of information bit continuously, and divide in same section, each data segment, length that is divided into can be inconsistent;
Step 103 is mapped to each data segment (comprising: the data segment of described information bit and the data segment of check digit) respectively on the respective resources of different subframes;
Leave the time interval between data segment after restructuring when mapping sends, the duration at described interval is greater than the handling duration of first received data segment; Different pieces of information section in same packet interval in time sends, and is mainly the data multiple step format ground discontinuity transmission of wanting after an initial data packet encoder.
In addition, transmitting terminal is except the data segment of the data segment that sends information bit and check digit, also issue control information in current period, carry the information such as size, modulation system and resource mapping situation of raw data packets corresponding to data to be received in current period in this control information.The resource mapping rule can be completed by transmitting terminal is pre-configured.
As shown in Figure 2, the schematic diagram that sends for individual data bag in the embodiment of the present invention.Raw data packets 1 in figure is described to illustrate the present invention.
Wherein S, P1 and the order of P2 are reconfigured segmentation, suppose to be divided into 3 sections; A kind of method of segmentation is described below, can be information bit as the S section, check digit is divided into two sections (P1 section and P2 sections), and each section can equate.
Each data segment is carried out resource mapping and framing, and the purpose of segmentation is (on different time points) discontinuous transmission of the data segment after the raw data packets chnnel coding.For example first paragraph is mapped on a certain resource of subframe 1#, on a certain resource that the 2nd section is mapped to subframe 3#, on a certain resource that the 3rd section is mapped to subframe 5#.On time, subframe is launched in order, and namely shooting sequence is 1#, 2#, 3#, 4#, 5#....
As shown in Figure 3, with in the system of OFDMA (OFDM access) as multi-access mode, general subframe inside is further divided into OFDM (OFDM) symbol, in a subframe, 6 or 7 OFDM symbols can be arranged in LTE, an OFDM symbol, entirely account on frequency, keep a period of time in time.OFDM symbol in LTE for example, time span is (0.5/7) ms, frequency account for whole system bandwidth, i.e. 20M.The first paragraph data can be mapped on first OFDM symbol on the 1# subframe, and other OFDM symbols can carry other and this irrelevant data of bag.
Above-mentioned with the segmentation after raw data packets 1 coding, be mapped on the symbol of different frames this method be described, but the invention is not restricted to this, said method also can similarly be generalized on the different discontinuous symbol that is mapped to same subframe.
The below describes with an application example, referring to Fig. 4.
The information bit S that raw data packets 1 produces afterwards at coding, check digit P1 and check digit P2.Adopt a kind of simple segmentation method, namely be divided into 3 sections to 1 ', information bit is one section, and check digit is divided into equal two sections, is designated as respectively P1 and P2.Wherein P1 and P2 interweave with evenly mixing later check digit.
After supposing raw data packets 1 interpolation CRC check, size is 100bit.Packet 1 is adopted the turbo coding, code check is 1/3, obtains respectively the information bit S after packet 1 is encoded, and size is 100bit, check digit P1, size is 100bit, check digit P2, and size is 100bit, certainly check digit can interweave here, can think directly that check digit is 200bit, not distinguish P1 and P2 (because in real system, general P1 and P2 interweaved, mix uniformly).
Information bit S after packet 1 coding is mapped on the 2nd the OFDM symbol of subframe 1#, and check digit P1 is mapped on 2 OFDM symbols of subframe 3#, and check digit P2 is mapped on the 3rd OFDM symbol of subframe 5#; After carrying out conventional treatment, upper antenna sends.
In this application example, be spaced apart the duration of a subframe between data after segmentation, here the duration of the data that receive more preferably greater than the terminal processes first paragraph of the duration at interval, in the time of can guaranteeing like this terminal first paragraph decoding error, can also receive remaining data, then the data aggregate decoding that receives with first paragraph;
And receiving terminal is known the resource mapping distribution situation after raw data packets 1 is encoded, the size of raw data packets 1, the information such as modulation system by modes such as control information or agreements.
As shown in Figure 4, the multiple step format for a plurality of raw data packets in the embodiment of the present invention shines upon schematic diagram.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1. the sending method of a wireless data packet, is characterized in that, comprising:
A: raw data packets is added the cyclic redundancy check (CRC) code CRC check, and carry out chnnel coding, the data after the coding that obtains being comprised of information bit and check digit are divided into a plurality of data segments with the data after coding;
B: each data segment is mapped to respectively discontinuous transmission in time on different resources, leaves the time interval between described data segment when mapping sends, the duration at described interval is completed the required duration of decoding one time more than or equal to receiving terminal.
2. the method for claim 1, is characterized in that,
In described steps A, the data after coding are interweaved, and respectively described information bit and check digit are reassembled as different data segments.
3. method as claimed in claim 2, is characterized in that,
Full detail position in the data that obtain after the initial data packet encoder is binned in a data segment.
4. method as claimed in claim 1 or 2, is characterized in that,
Described each data segment, length equates.
5. the method for claim 1, is characterized in that,
Transmitting terminal is carried at the size of described raw data packets and resource mapping distribution situation in control information and issues.
6. the method for claim 1, is characterized in that,
In described step B, each data segment is mapped to respectively OFDM symbol on different subframes or the different OFDM symbols discontinuous transmission in time on same subframe.
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| CN2008101114678A CN101610463B (en) | 2008-06-19 | 2008-06-19 | Method for sending wireless data |
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| CN2008101114678A CN101610463B (en) | 2008-06-19 | 2008-06-19 | Method for sending wireless data |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103379076B (en) * | 2012-04-27 | 2016-09-28 | 电信科学技术研究院 | A kind of carry out the method for uplink, system and equipment |
| CN106656435B (en) * | 2016-11-01 | 2019-06-25 | 深圳职业技术学院 | A kind of data head passes, repeating method |
| CN106506117B (en) * | 2016-11-01 | 2019-12-27 | 深圳职业技术学院 | Robust data transmission method |
| CN110602687A (en) * | 2018-06-13 | 2019-12-20 | 华为技术有限公司 | Method and device for sending and receiving capability information |
| CN114510401A (en) * | 2018-06-13 | 2022-05-17 | 姜锋 | Information transmission safety method and system based on current electric power sustainable duration of host |
| CN112188546B (en) * | 2019-07-03 | 2023-06-27 | 成都华为技术有限公司 | Method and device for transmitting data |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1666442A (en) * | 2002-07-05 | 2005-09-07 | 松下电器产业株式会社 | Radio communication base station device, radio communication mobile station device, and radio communication method |
| CN101291452A (en) * | 2007-04-18 | 2008-10-22 | 华为技术有限公司 | Data transmitting method, radiating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1666442A (en) * | 2002-07-05 | 2005-09-07 | 松下电器产业株式会社 | Radio communication base station device, radio communication mobile station device, and radio communication method |
| CN101291452A (en) * | 2007-04-18 | 2008-10-22 | 华为技术有限公司 | Data transmitting method, radiating device |
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Application publication date: 20091223 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: Method for sending wireless data Granted publication date: 20130508 License type: Common License Record date: 20151123 |
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