CN101378545B - Layered transmission method for multimedia broadcast and multicast business - Google Patents
Layered transmission method for multimedia broadcast and multicast business Download PDFInfo
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Abstract
The invention discloses a layered transmitting method of multimedia broadcasting and multicasting service. The layered transmitting method is based on channel coding and decoding, modulation/demodulation, and multi-antenna techniques, and consists of two sections, namely, sending and receiving. The sending method of the layered transmitting method comprises the steps that: the data for transmitting the multimedia broadcasting and multicasting service is divided into two layers to carry out separate coding according to video frequency data and audio frequency data, and the video frequency data and the audio frequency data after coding are layered, and key bits acting on decoding of a receiving end are divided to the first layer, while other bits to the second layer; and after a second layering is conducted to the video frequency data and the audio frequency data, two layers of the data are separately conducted with length marching and modulation, then the first layer data after modulation is sent by a more reliable means, and later the second layer data after modulation is transmitted by a high efficient method. The receiving method of the layered transmitting method comprises the steps that: estimation, inspection, modulation and multi-antenna processes are carried out to a channel, and the first layer data and the second layer data are received to carry out channel decoding with the integration of HARQ (hybrid automatic repeated request) combining technology. The layered transmitting method improves system performance and throughput rate.
Description
Technical field
The present invention relates to the method that a kind of combination channel coding and decoding technology, layering, modulating/demodulating technology, multi-antenna technology, HARQ technology are come some crucial bit informations in reliable transmission MBMS (multimedia broadcasting and the multicast) business; Relate in particular to the wireless data transmission field, based on the multimedia broadcasting and the multicast service layered transmission method of channel coding and decoding technology, layering, modulating/demodulating technology, multi-antenna technology, HARQ technology.
Background technology
Follow-on wireless communication system will provide better speech quality, the faster data transmission rate.But, the time multipath transmission environment, limited bandwidth resources and the user that become make above-mentioned requirements implement very difficulty to the demand of service.Effective ways that address these problems are to adopt diversity technique.Diversity technique can be divided into time diversity, frequency diversity and space diversity etc. according to the difference that obtains the independent pathway signal method.With regard to time diversity, frequency diversity and space diversity three, because under the slow fading situation, time domain interweaves and can cause the bigger delay of signal, will introduce interference this moment, thereby the business of delay sensitive is not suitable for; And when the coherence bandwidth of channel greater than apread spectrum bandwidth or delay of signals expansion relatively hour, it is just not too suitable to utilize spread spectrum to obtain frequency diversity; But in most of the cases, space diversity reception to communicate can obtain great diversity gain without the victim signal frequency bandwidth when guaranteeing message transmission rate.
The channel coding and decoding technology is the indispensable link of transmitting chain in the wireless telecommunications.In digital communication, the transmission of data in channel can receive interference of noise, thereby causes the reception information errors.Make signal can be in noisy channel reliable transmission, must add some redundancies for artificially transferred information, Here it is coding.The Turbo code of current trend, LDPC sign indicating number etc. can only just can be accomplished decoding with the part check bit.
In traditional incremental redundancy HARQ (mixing automatic repeat requests) retransmission mechanism; When transmission block makes a mistake; Be data block (CC merges mode) or the part (IR merges mode) of error block through error of transmission again; And merge reception, thereby obtain to retransmit gain the recipient.
The display screen that the present professional present situation of MBMS (multimedia broadcasting and multicast) is the terminal is less, and the user generally is unwilling to keep a close watch on for a long time screen and sees, so operator and user require lower, exigent to audio quality on the contrary to video signal quality.
Summary of the invention
The technical problem that the present invention solved is to provide a kind of multimedia broadcasting and multicast layered transmission method; Based on channel coding and decoding technology, layering, modulating/demodulating technology, multi-antenna technology, HARQ technology; Form by method of sending and receiving two parts; This layered transmission method and multi-antenna technology and HARQ combine, and can improve systematic function and throughput effectively.
In order to address the above problem, the invention provides a kind of multimedia broadcasting and multicast service layering sending method, based on channel coding technology, layering, modulation technique, multi-antenna technology, hybrid automatic repeat request technology, it is characterized in that, may further comprise the steps:
(1) be divided into two-layer to transmitting multimedia broadcast and multi-cast business data according to video and voice data; And carry out absolute coding respectively; Video and voice data to behind the coding carry out layering respectively; Assign to ground floor to the crucial bit of receiving terminal being deciphered the effect of playing, other bit is assigned to the second layer;
(2) two layer data after said video and the voice data layering are for the second time carried out length coupling and modulation respectively, and the ground floor data after the modulation are sent earlier, the second layer data after whether the decoding information that receives according to receiving terminal is again selected will modulate are sent.
Method of the present invention, wherein, step (1) further comprises: said crucial bit comprises: the crucial bit to Turbo code is systematic bits or systematic bits and part check bit; The high bit of check-node number of times in the sparse matrix to the crucial bit of LDPC sign indicating number during for coding.
Said method; Wherein, Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering, layered mode be all systematic bits in the data after Turbo is encoded as ground floor, all verification check bits as the second layer; As ground floor, all the other bits are as the second layer to the high bit of the check node number of times of the data behind the LDPC coding.
Wherein, Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering; Layered mode is as ground floor, remaining all check bits as the second layer to all systematic bits in the data behind the Turbo coding and part check bit; As ground floor, other bit is as the second layer to the high bit of the check-node number of times of the data behind the LDPC coding; If when many antenna transmission are perhaps modulated, when the ground floor and the second layer can not satisfy the length matching relationship, also should be put into ground floor by the bit that the second layer is unnecessary.
Method of the present invention, wherein, the said modulation of step (2) comprises: two layer data to after the layering second time are carried out separate modulation, perhaps two layer data after the layering second time are carried out hybrid modulation;
The principle of said modulation is that the ground floor data after the modulation can correctly be received at receiving terminal.
Method of the present invention wherein, is sent earlier the ground floor data after the modulation described in the step (2), and send mode is for adopting diversity mode; Described in the step (2) second layer data after the modulation are sent, send mode is for adopting multiplex mode.
In order to address the above problem; The present invention also provides a kind of multimedia broadcasting and multicast service layering method of reseptance; Based on channel decoding technology, detection, demodulation techniques, multi-antenna technology, hybrid automatic repeat request technology; This method comprises: carry out channel estimating, detection, demodulation, many antenna processing, it is characterized in that, further comprise following channel decoding step:
(1) the ground floor data that receive is deciphered, and this decoding is judged if incorrect then indicate transmitting terminal to send second layer data, and receive said second layer data;
(2) data that receive are combined to mix automatic repeat requests folding and carry out channel decoding.
In order to address the above problem; The present invention also provides a kind of multimedia broadcasting and multicast service layering sending method; Based on channel coding technology, layering, modulation technique, multi-antenna technology, hybrid automatic repeat request technology, it is characterized in that, may further comprise the steps:
(1) be divided into two-layer to transmitting multimedia broadcast and multi-cast business data according to video and voice data; And carry out absolute coding respectively; Video and voice data to behind the coding carry out layering respectively; Assign to ground floor to the crucial bit of receiving terminal being deciphered the effect of playing, other bit is assigned to the second layer;
(2) two layer data after said video and the voice data layering are for the second time carried out length coupling and modulation respectively, and the ground floor data after the modulation are sent earlier, send after the second layer data after will modulating again.
Method of the present invention, wherein, step (1) further comprises: said crucial bit comprises: the crucial bit to Turbo code is systematic bits or systematic bits and part check bit; The high bit of check-node number of times in the sparse matrix to the crucial bit of LDPC sign indicating number during for coding.
Said method; Wherein, Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering, layered mode be all systematic bits in the data after Turbo is encoded as ground floor, all verification check bits as the second layer; As ground floor, all the other bits are as the second layer to the high bit of the check node number of times of the data behind the LDPC coding.
Wherein, Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering; Layered mode is as ground floor, remaining all check bits as the second layer to all systematic bits in the data behind the Turbo coding and part check bit; To the high bit of the check-node number of times of the data behind the LDPC coding as ground floor; Other bit is as the second layer; If when many antenna transmission are perhaps modulated, when the ground floor and the second layer can not satisfy the length matching relationship, also should be put into ground floor by the bit that the second layer is unnecessary.
Method of the present invention, wherein, the said modulation of step (2) comprises: two layer data to after the layering second time are carried out separate modulation, perhaps two layer data after the layering second time are carried out hybrid modulation;
The principle of said modulation is that the ground floor data after the modulation can correctly be received at receiving terminal.
Method of the present invention wherein, is sent earlier the ground floor data after the modulation described in the step (2), and send mode is for adopting diversity mode; To sending after the second layer data after the modulation, send mode is for adopting multiplex mode described in the step (2).
In order to address the above problem; The present invention also provides a kind of multimedia broadcasting and multicast service layering method of reseptance; Based on channel decoding technology, detection, demodulation techniques, multi-antenna technology, hybrid automatic repeat request technology; This method comprises: carry out channel estimating, detection, demodulation, many antenna processing, it is characterized in that, further comprise following channel decoding step:
(1) receives ground floor data and second layer data;
(2) two layer data that receive are combined to mix automatic repeat requests folding and carry out channel decoding.
Advantage of the present invention:
1, well satisfied the professional present actual demand of MBMS.
2, make full use of multi-antenna technology and divided collection and multiplexing advantage.
3, receiving terminal has utilized HARQ technology, decoding then.
4, make transfer of data efficient more and reliable.
Description of drawings
Fig. 1 is the process chart of described a kind of multimedia broadcasting of the embodiment of the invention and multicast service layering sending method;
Fig. 2 is the process chart of described a kind of multimedia broadcasting of the embodiment of the invention and multicast service layering method of reseptance.
Embodiment
The present invention provides a kind of multimedia broadcasting and multicast service layered transmission method here; Based on channel coding and decoding, modulating/demodulating, multi-antenna technology; This layered transmission method and many days technology and HARQ combine, and can improve systematic function and throughput effectively.Below embodiment is described in detail, but not as to qualification of the present invention.
Sending method according to the invention content is roughly at first treated transferring MBMS service data and is carried out layering (doing layering for the first time to this secondary clearing note); The Voice & Video data of data separately; Respectively the Voice & Video data are carried out absolute coding then; Carry out layering (doing layering for the second time to this secondary clearing note) to the data behind the Voice & Video coding respectively; Second layer layering is to separate systematic bits behind the audio data coding (being designated as S1) and check bit (P1), separates systematic bits behind the video coding (S2) and check bit (P2).
Layering for the second time comes down to assign to ground floor to the crucial bit of receiving terminal being deciphered the effect of playing, and other bit is assigned to the second layer; Crucial bit is exactly a systematic bits for Turbo code; If systematic bits negligible amounts (when for example going up many antenna transmission and perhaps modulating when sending; When layer one deck two can not satisfy the length matching relationship), at this moment can consider to add into ground floor to a spot of check bit again.For the LDPC sign indicating number, the bit that the check-node number of times is high in the sparse matrix during coding is crucial bit.(for example, be the check-node number of times that bit definitions more than 3 is crucial bit, this number of times thresholding of 3 can own requirement oneself according to system defines here).
As important information, in many antennas, adopt more reliably that mode transmits, as diversity mode or be assigned on the stream 1 to S1 and S2; Adopt P1 and P2 the high mode of efficiency of transmission to transmit as time important information, as multiplex mode.The defeated principle of multi-antenna transmitting is to adopt S1 and S2 reliable more mode to transmit.
Receiving terminal can carry out HARQ to the data that receive and merge laggard row decoding.
The benefit of above-mentioned this method is coding techniques, modulation technique, and multi-antenna technology, the HARQ technology is taken into consideration, utilizes the advantage of each technology point to improve whole performance.
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is done to describe in detail further below.
As shown in Figure 1, a kind of process chart of multimedia broadcasting and the multicast service layering sending method based on chnnel coding, modulation, many antennas.
Said a kind of layered approach that video and voice data behind the coding are carried out layering respectively is that the systematic bits and the check bit of the data after Turbo is encoded carries out layering; Layered mode be to all systematic bits in the data behind the Turbo coding as ground floor, all verification check bits as the second layer;
Another kind of layered approach is that the systematic bits and the check bit of the data after Turbo is encoded carries out layering; Layered mode is as ground floor, remaining all check bits as the second layer to all systematic bits in the data behind the Turbo coding and part check bit;
Also have a kind of layered approach be to the high bit of the check node number of times of the data behind the LDPC coding as ground floor, all the other bits are as the second layer;
Another kind of layered approach is that the high bit of the check-node number of times of the data after LDPC is encoded is as ground floor; Other bit is as the second layer; When if many antenna transmission are perhaps modulated; When layer one deck two can not satisfy the length matching relationship, also the unnecessary bit of the considered second layer was put into ground floor, to meet the Data Matching of transmission.
Step 104-105 carries out length coupling and modulation respectively to two layer data after said video and the voice data layering for the second time; Said modulation comprises: two layer data to after the layering second time are carried out separate modulation, perhaps two layer data after the layering second time are carried out hybrid modulation; The principle of said modulation is that the ground floor data after the modulation can more correctly be received at receiving terminal reliably;
Wherein, said data length coupling is meant, fails the length matching problem that mode is come taking into account critical bit and other bit in conjunction with modulation and multi-antenna transmitting.
Ground floor The data diversity mode sends in the above-mentioned steps 106, and second layer The data multiplex mode sends.On the data sending order, the ground floor data are sent earlier, and second layer data are redispatched.(main here) because the ground floor data probably just can solve correct information.
As shown in Figure 2, for described a kind of based on the multimedia broadcasting of channel decoding, demodulation, many antennas and the process chart of multicast service layering method of reseptance.
Step 201-203, conventional processing receiving terminal is done decoding to the data that receive before comprises and carries out channel estimating, detects, demodulation, outside the normal handling such as many antenna processing, adopt a kind of in the following processing mode again:
If 1 under the good situation of channel quality; Can be earlier to the advanced row decoding of the emission data of the ground floor after the layering second time; If correct, as just need not to send second layer data, if data incorrect then that send the second layer; Wherein, at receiving terminal the mode that the The data HARQ of twice transmission merges is improved performance.
2, after said receiving terminal etc. is received the second layer data after the layering for the second time, to two layer data that receive carry out HARQ merge after decoding again; So just can introduce the gain that HARQ merges.
The advantage of embodiment according to the invention:
1, well satisfied the professional present actual demand of MBMS.
2, make full use of multi-antenna technology and divided collection and multiplexing advantage.
3, receiving terminal has utilized HARQ technology, decoding then.
4, make transfer of data efficient more and reliable.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (13)
1. multimedia broadcasting and multicast service layering sending method based on channel coding technology, layering, modulation technique, multi-antenna technology, hybrid automatic repeat request technology, is characterized in that, may further comprise the steps:
(1) be divided into two-layer to transmitting multimedia broadcast and multi-cast business data according to video and voice data; And carry out absolute coding respectively; Video and voice data to behind the coding carry out layering respectively; Assign to ground floor to the crucial bit of receiving terminal being deciphered the effect of playing, other bit is assigned to the second layer;
(2) two layer data after said video and the voice data layering are for the second time carried out length coupling and modulation respectively, and the ground floor data after the modulation are sent earlier, the second layer data after whether the decoding information that receives according to receiving terminal is again selected will modulate are sent; Wherein, Second layer data transmission after whether the decoding information that receives according to receiving terminal is selected will modulate comprises: when receiving terminal is correct to the ground floor data decoding that receives; Do not send the data of the second layer; When receiving terminal is incorrect to the ground floor data decoding that receives, send the data of the second layer.
2. the method for claim 1 is characterized in that, step (1) further comprises: said crucial bit comprises: the crucial bit to Turbo code is systematic bits or systematic bits and part check bit; The high bit of check-node number of times in the sparse matrix to the crucial bit of LDPC sign indicating number during for coding.
3. method as claimed in claim 2; It is characterized in that; Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering, layered mode be all systematic bits in the data after Turbo is encoded as ground floor, all verification check bits as the second layer; As ground floor, all the other bits are as the second layer to the high bit of the check node number of times of the data behind the LDPC coding.
4. method as claimed in claim 2; It is characterized in that; Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering, and layered mode be as ground floor, remaining all check bits as the second layer to all systematic bits in the data behind the Turbo coding and part check bit; As ground floor, other bit is as the second layer to the high bit of the check-node number of times of the data behind the LDPC coding; If when many antenna transmission are perhaps modulated, when the ground floor and the second layer can not satisfy the length matching relationship, also should be put into ground floor by the bit that the second layer is unnecessary.
5. the method for claim 1 is characterized in that, the said modulation of step (2) comprises: two layer data to after the layering second time are carried out separate modulation, perhaps two layer data after the layering second time are carried out hybrid modulation;
The principle of said modulation is that the ground floor data after the modulation can correctly be received at receiving terminal.
6. the method for claim 1 is characterized in that, described in the step (2) the ground floor data after the modulation is sent earlier, and send mode is for adopting diversity mode; Described in the step (2) second layer data after the modulation are sent, send mode is for adopting multiplex mode.
7. multimedia broadcasting and multicast service layering method of reseptance; Based on channel decoding technology, detection, demodulation techniques, multi-antenna technology, hybrid automatic repeat request technology; This method comprises: carry out channel estimating, detection, demodulation, many antenna processing; It is characterized in that, further comprise following channel decoding step:
(1) the ground floor data that receive is deciphered, and this decoding is judged if incorrect then indicate transmitting terminal to send second layer data, and receive said second layer data;
(2) data that receive are combined to mix automatic repeat requests folding and carry out channel decoding; Wherein, the crucial bit of ground floor data after, other the bit of second layer data after for coding for the coding that receiving terminal decoding is played effect.
8. multimedia broadcasting and multicast service layering sending method based on channel coding technology, layering, modulation technique, multi-antenna technology, hybrid automatic repeat request technology, is characterized in that, may further comprise the steps:
(1) be divided into two-layer to transmitting multimedia broadcast and multi-cast business data according to video and voice data; And carry out absolute coding respectively; Video and voice data to behind the coding carry out layering respectively; Assign to ground floor to the crucial bit of receiving terminal being deciphered the effect of playing, other bit is assigned to the second layer;
(2) two layer data after said video and the voice data layering are for the second time carried out length coupling and modulation respectively, and the ground floor data after the modulation are sent earlier, send after the second layer data after will modulating again; Wherein, adopt when many antennas more reliably mode to send earlier, send the second layer data after will modulating again adopt high efficiency mode when many antennas after the ground floor data after the modulation.
9. method as claimed in claim 8 is characterized in that, step (1) further comprises: said crucial bit comprises: the crucial bit to Turbo code is systematic bits or systematic bits and part check bit; The high bit of check-node number of times in the sparse matrix to the crucial bit of LDPC sign indicating number during for coding.
10. method as claimed in claim 9; It is characterized in that; Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering, layered mode be all systematic bits in the data after Turbo is encoded as ground floor, all verification check bits as the second layer; As ground floor, all the other bits are as the second layer to the high bit of the check node number of times of the data behind the LDPC coding.
11. method as claimed in claim 9; It is characterized in that; Step (1) is said carries out layering respectively to video and voice data behind the coding; Comprise: crucial bit and other bit to the data behind the coding carry out layering, and layered mode be as ground floor, remaining all check bits as the second layer to all systematic bits in the data behind the Turbo coding and part check bit; To the high bit of the check-node number of times of the data behind the LDPC coding as ground floor; Other bit is as the second layer; If when many antenna transmission are perhaps modulated, when the ground floor and the second layer can not satisfy the length matching relationship, also should be put into ground floor by the bit that the second layer is unnecessary.
12. method as claimed in claim 8 is characterized in that, the said modulation of step (2) comprises: two layer data to after the layering second time are carried out separate modulation, perhaps two layer data after the layering second time are carried out hybrid modulation;
The principle of said modulation is that the ground floor data after the modulation can correctly be received at receiving terminal.
13. method as claimed in claim 8 is characterized in that, described in the step (2) the ground floor data after the modulation is sent earlier, send mode is for adopting diversity mode; To sending after the second layer data after the modulation, send mode is for adopting multiplex mode described in the step (2).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1571512A (en) * | 2004-04-30 | 2005-01-26 | 清华大学 | Mobile terminal oriented multimedia broadcasting system and implementing method thereof |
| 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 |
| CN1668025A (en) * | 2004-03-10 | 2005-09-14 | 浙江大学 | Data, voice and video merged multi-code rate coding-decoding and isochronous transmission method thereof |
| CN1998233A (en) * | 2004-08-09 | 2007-07-11 | 韩国电子通信研究院 | 3-dimensional digital multimedia broadcasting system |
| CN101001133A (en) * | 2006-12-15 | 2007-07-18 | 重庆重邮信科股份有限公司 | HARQ merge decoding method |
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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 |
| CN1668025A (en) * | 2004-03-10 | 2005-09-14 | 浙江大学 | Data, voice and video merged multi-code rate coding-decoding and isochronous transmission method thereof |
| CN1571512A (en) * | 2004-04-30 | 2005-01-26 | 清华大学 | Mobile terminal oriented multimedia broadcasting system and implementing method thereof |
| CN1998233A (en) * | 2004-08-09 | 2007-07-11 | 韩国电子通信研究院 | 3-dimensional digital multimedia broadcasting system |
| CN101001133A (en) * | 2006-12-15 | 2007-07-18 | 重庆重邮信科股份有限公司 | HARQ merge decoding method |
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