CN101094045B - Method for transmitting correct reply message and / or error reply message - Google Patents
Method for transmitting correct reply message and / or error reply message Download PDFInfo
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Abstract
This method (1) uses the 1st orthogonal code or the 1st quasi-orthogonal code to freq-expand the correct answer message and/or the error answer message (CAM/EAM); (2) repeats multi-times the freq-expanded CAM/EAM; maps the identical repeated CAM/EAM to one or several OFDM symbolic sub-carrier; (3) Via the 1st orthogonal code or the 1st quasi-orthogonal code, multiplexes the CAM/EAM, which are mapped on the OFDM symbol of users of the identical group. This invention supports the flexible resource distribution, has simple structure and good freq.-division set gain. It can ensure enough number of users, a low resource overhead and reduce effectively the adjacent-cell interfere.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of based on Orthodoxy Frequency Division Multiplex (Orthogonal Frequency Division Multiplexing, OFDM) the correct response message of system and/or the transmission method of error response message.
Background technology
At present, the OFDM technology is fast-developing, and by feat of many advantages, this technology has been called one of main candidate scheme of following wireless communication technology.
The OFDM technology is divided into many orthogonal sub-carriers with given channel in frequency domain, difference modulation signal on each subcarrier, and each subcarrier parallel transmission.Like this, although the frequency response curve of wireless channel is a non-flat forms, has frequency selectivity; But the frequency response in each subcarrier; What on each subcarrier, carry out is narrow band transmission, and signal bandwidth is less than channel width, so the interference between the erasure signal waveform greatly.And because each number of sub-carrier is mutually orthogonal in ofdm system, and their frequency spectrum is overlapped, so not only reduced the phase mutual interference between subcarrier, and the while has been improved the availability of frequency spectrum again.OFDM utilizes inverse fast fourier transform/FFT (IFFT/FFT) to replace multi-carrier modulation and demodulation in addition, has reduced the complexity of Base-Band Processing.
The develop rapidly of digital communication system is had higher requirement to the reliability of data communication, yet under abominable channel, especially in high data rate or the high-speed mobile environment, multipath interference and Doppler frequency shift etc. seriously affect systematic function.Therefore, effective error-control technique, (Hybrid Automatic RepeatRequest, HARQ) technology just becomes the focus that the communications field endeavours to study especially to mix automatic request retransmission.
In the HARQ mode, the sign indicating number that sends of making a start not only can error detection, but also has certain error correcting capability.After the receiving terminal decoder is received code word, at first check error situation,, then carry out error correction automatically if in the error correcting capability of sign indicating number; If wrong a lot, surpassed the error correcting capability of sign indicating number, but can faults come out, then receiving terminal is given the decision signal of making a start through feedback channel, requires to make a start retransmission of information.In ofdm system, represent the correct or mistake of transmission through correct response message/error response message (ACK/NACK) control signaling, and need to judge whether to retransmit with this.
Because there are multiple transmission means in ACK and NACK resource, and the expense of the performance of every kind of transmission means and required respective resources is all different.At present; At third generation partner program (3rd Generation Partnership Project; 3GPP) Long Term Evolution plan (Long Term Evolution; LTE) in FDD (Frequency Division Duplex, the frequency division multiplexing) system, also there is not to propose solution to this problem.
Summary of the invention
Consider the problems referred to above and make the present invention that for this reason, main purpose of the present invention is to provide the transmission plan of a kind of correct response message and/or error response message.
According to embodiments of the invention, the transmission method of a kind of correct response message and/or error response message is provided.
This method comprises: step S102, utilize first orthogonal code or the first quasiorthogonal code correct response message and/or error response message to carry out spread spectrum; Step S104 repeatedly repeats correct response message and/or error response message behind the spread spectrum, and identical correct response message and/or error response message is mapped on the subcarrier of one or more OFDM symbols after will repeating; And step S106, carry out multiplexing through first orthogonal code or first quasiorthogonal code to correct response message and/or the error response message that shines upon on user's the OFDM symbol on the same group mutually.
Wherein, In step S104; Be mapped on the OFDM symbol if will repeat identical correct response message and/or the error response message in back, then further comprise: the correct response message that will shine upon and/or error response message repeat on a plurality of same frequency position of a plurality of OFDM symbols; And utilize correct response message and/or the error response message on second orthogonal code or the second quasiorthogonal code Modulation OFDM symbol.
At this moment, in step S106, further comprise: utilize first orthogonal code or first quasiorthogonal code and second orthogonal code or second quasiorthogonal code to mutually on the same group in correct response message and/or error response message on user's the OFDM symbol carry out multiplexing.
On the other hand, identical correct response message and/or error response message is mapped under the situation on a plurality of OFDM symbols after will repeating, and a plurality of OFDM symbols are continuous or discrete on time domain.And in this case, a plurality of OFDM symbols take overlapping or nonoverlapping frequency domain resource.
In addition, in the method, the subcarrier on the OFDM symbol is continuous or discrete on frequency domain.
And; In the method; The user is divided into groups, the user on the same group mutually transmit correct response message and/or error response message in identical running time-frequency resource, and carry out multiplexing to correct response message and/or the error response message that transmits through first orthogonal code or first quasiorthogonal code; And it is multiplexing to use different carrier positions that the correct response message of not shining upon on user's the OFDM symbol on the same group and/or error response message are carried out, in different running time-frequency resources, the user in is on the same group not transmitted correct response message and/or error response message.
In addition, in step S106, may further include: the user of different districts uses different scramblers.
In addition, above-mentioned correct response message and error response message can be respectively 1 bit.
Through technique scheme of the present invention, can support resource allocation more flexibly, and have lower complexity and good time-frequency diversity gain; Simultaneously can guarantee abundant number of users and than the low-resource expense, and can reduce the adjacent area well and disturb.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the transmission method of the correct response message of the embodiment of the invention and/or error response message;
Fig. 2 is the sketch map that a plurality of OFDM symbols is shone upon according in the transmission method of the correct response message of the embodiment of the invention and/or error response message; And
Fig. 3 is the sketch map that an OFDM symbol is shone upon according in the transmission method of the correct response message of the embodiment of the invention and/or error response message.
Embodiment
The transmission method of a kind of correct response message and/or error response message is provided in the present embodiment.
As shown in Figure 1, this method comprises: step S102, utilize first orthogonal code or the first quasiorthogonal code correct response message and/or error response message (1 bit) to carry out spread spectrum; Step S104 repeatedly repeats correct response message and/or error response message behind the spread spectrum, and identical correct response message and/or error response message is mapped on the subcarrier of one or more OFDM symbols after will repeating; And step S106, through first orthogonal code or first quasiorthogonal code correct response message of shining upon on user's the OFDM symbol on the same group mutually and/or error response message are carried out multiplexing (that is, to user's message carry out code division multiplexing) on the same group.
Wherein, in the spread spectrum process of in step S102, being carried out, if the length of first orthogonal code or first quasiorthogonal code is M, the message that then receives spread spectrum is by spread spectrum M times.
Wherein, In step S104; Be mapped on the OFDM symbol if will repeat identical correct response message and/or the error response message in back, then further comprise: the correct response message that will shine upon and/or error response message repeat on a plurality of same frequency position of a plurality of OFDM symbols; And utilize correct response message and/or the error response message on second orthogonal code or the second quasiorthogonal code Modulation OFDM symbol.
In this case, can the information of M times of spread spectrum be repeated n-1 time, and n is organized identical correct response message and/or error response message is mapped on 1 carrier wave of the n * M on the OFDM symbol.
At this moment, in step S106, further comprise: utilize first orthogonal code or first quasiorthogonal code and second orthogonal code or second quasiorthogonal code to mutually on the same group in correct response message and/or error response message on user's the OFDM symbol carry out multiplexing.
On the other hand, identical correct response message and/or error response message is mapped under the situation on a plurality of OFDM symbols after will repeating, and a plurality of OFDM symbols are continuous or discrete on time domain.And in this case, a plurality of OFDM symbols take overlapping or nonoverlapping frequency domain resource.At this moment, the information of M times of spread spectrum is repeated n-1 time, and after will repeating altogether n organize on the M number of sub-carrier that identical correct response message and/or error response message be mapped to n OFDM symbol.
In addition, in the method, the subcarrier on the OFDM symbol is continuous or discrete on frequency domain.
And; In the method; The user is divided into groups; The user on the same group mutually transmit correct response message and/or error response message in identical running time-frequency resource, and carry out multiplexing to correct response message and/or the error response message that transmits through first orthogonal code or first quasiorthogonal code (for example, above-mentioned length is orthogonal code or the quasiorthogonal code of M); And use different carrier positions to the correct response message of not shining upon on user's the OFDM symbol on the same group and/or error response message carry out multiplexing (promptly; To not on the same group in user's message carry out frequency division multiplexing), in different running time-frequency resources, the user in is on the same group not transmitted correct response message and/or error response message.
The user in is not on the same group transmitted correct response message and/or error response message in different running time-frequency resources.
In step S106, may further include: the user of different districts uses different scramblers to reduce the interference of neighbour between going.
Alternatively, except code division multiplexing and frequency division multiplexing, can also adopt other multiplex mode, for example, time division multiplexing.
Below will be with third generation partner program (3rd Generation PartnershipProject; 3GPP) Long Term Evolution plan (Long Term Evolution; LTE) FDD (Frequency Division Duplex, frequency division multiplexing) system is an example, describes the present invention in detail.
In this example, suppose that bandwidth is 5MHz, then number of usable subcarriers is 300, contains 14 continuous OFDM symbols in the sub-frame.
Correct response message and/or error response message are being mapped under the situation of a plurality of OFDM symbols, and the concrete steps of its transmission are following:
(1) using length is to be 4 walsh orthogonal code with 4 times of 1 bit ACK/nack message spread spectrum;
(2) information behind the spread spectrum is repeated 2 times;
(3) as shown in Figure 2; 3 groups of identical correct response messages and error response message are mapped to respectively on the 98th, 99,101,102 number of sub-carrier of the 2nd, 3,5,6 number of sub-carrier of first OFDM symbol in the subframe, second OFDM symbol, and on the 194th, 195,197,198 number of sub-carrier of the 3rd OFDM symbol;
(4) all users that carry out the transmission of correct response message and/or error response message simultaneously being divided into groups, transmit in identical running time-frequency resource the user on the same group mutually, is that 4 wash orthogonal intersection is realized the code division multiplexing (CDM) between the user through length.The different running time-frequency resource of CU on the same group not; All while transferring ACK/NACK users are sent according to the method described above;
(5) correct response message/error response message channel is done the scrambling operation based on the sub-district.
Correct response message and/or error response message are being mapped under the situation of an OFDM symbol, and the concrete steps of its transmission are following:
(1) to use length be 4 wash orthogonal code with 4 times of the correct response message of 1 bit and/or error response message spread spectrums;
(2) spread spectrum information is repeated 2 times;
(3) with the 2nd, 3,5,6 number of sub-carrier and the 98th, 99,101,102 number of sub-carrier of these 3 groups identical ACK/NACK information mapping first OFDM symbol in the subframe, and on the 194th, 195,197,198 number of sub-carrier;
(4) the ACK/NAK information on first OFDM symbol is repeated on the same frequency position on second OFDM symbol and the 3rd the OFDM symbol in subframe;
(5) using length is the ACK/NACK information on these 3 continuous OFDM symbols of DFT orthogonal code modulation of 3;
(6) like Fig. 3, shown in all users of transmitting are simultaneously divided into groups, transmit in identical running time-frequency resource the user on the same group mutually, be that 4 wash orthogonal code and length are that 3 DFT orthogonal code realizes the code division multiplexing (CDM) between the user through length.The different running time-frequency resource of CU on the same group not; All while transferring ACK/NACK users are sent according to the method described above;
(7) the ACK/NACK channel is done the scrambling operation based on the sub-district.
In sum; The present invention is can be with the lower more user of resource overhead support multiplexing and obtain bigger diversity gain; And guarantee the transmission performance of ACK/NACK simultaneously; In the mapping scheme to the OFDM symbol, the ACK/NACK information multiplexing that can realize different user through code division multiplexing (CDM) and frequency division multiplexing (FDM) is to guarantee the small system resource expense; Through spread spectrum and the transmission performance that repeats to guarantee ACK/NACK, obtain higher diversity gain through the Discrete Mapping on frequency domain and the time domain.Therefore,, can support resource allocation more flexibly, and have lower complexity and good time-frequency diversity gain by means of technical scheme of the present invention; Simultaneously can guarantee abundant number of users and than the low-resource expense, and can reduce the adjacent area well and disturb.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the transmission method of correct response message and/or error response message is characterized in that, comprising:
Step S102 utilizes first orthogonal code or first quasiorthogonal code that said correct response message and/or said error response message are carried out spread spectrum;
Step S104 repeatedly repeats said correct response message behind the spread spectrum and/or said error response message, and identical said correct response message and/or said error response message is mapped on the subcarrier of one or more OFDM symbols after will repeating; And
Step S106 carries out multiplexing through said first orthogonal code or said first quasiorthogonal code to said correct response message and/or the said error response message that shines upon on user's the said OFDM symbol on the same group mutually;
Wherein, in said step S104, if identical said correct response message and/or the said error response message in said repetition back is mapped on the OFDM symbol, then said method further comprises:
The said correct response message and/or the said error response message of mapping are repeated on a plurality of same frequency position of a plurality of said OFDM symbols; And
Utilize second orthogonal code or second quasiorthogonal code to modulate said correct response message and/or said error response message on the said OFDM symbol.
2. the transmission method of correct response message according to claim 1 and/or error response message is characterized in that, in said step S106, further comprises:
Utilize said first orthogonal code or first quasiorthogonal code and said second orthogonal code or second quasiorthogonal code to mutually on the same group in said correct response message and/or said error response message on user's the said OFDM symbol carry out multiplexing.
3. the transmission method of correct response message according to claim 1 and/or error response message; It is characterized in that; Identical said correct response message and/or the said error response message in said repetition back is being mapped under the situation on a plurality of said OFDM symbols, and said a plurality of OFDM symbols are continuous or discrete on time domain.
4. the transmission method of correct response message according to claim 1 and/or error response message; It is characterized in that; Identical said correct response message and/or the said error response message in said repetition back is being mapped under the situation on a plurality of said OFDM symbols, and said a plurality of OFDM symbols take overlapping or nonoverlapping frequency domain resource.
5. according to the transmission method of each described correct response message and/or error response message in the claim 1 to 4, it is characterized in that the subcarrier on the said OFDM symbol is continuous or discrete on frequency domain.
6. according to the transmission method of each described correct response message and/or error response message in the claim 1 to 4; It is characterized in that; The user is divided into groups; The said user on the same group mutually transmit said correct response message and/or said error response message in identical running time-frequency resource, and carry out multiplexing to said correct response message and/or the said error response message that transmits through said first orthogonal code or said first quasiorthogonal code; And it is multiplexing to use different carrier positions that the said correct response message of not shining upon on user's the said OFDM symbol on the same group and/or said error response message are carried out, in different running time-frequency resources, the said user in is on the same group not transmitted said correct response message and/or said error response message.
7. according to the transmission method of each described correct response message and/or error response message in the claim 1 to 4, it is characterized in that in said step S106, further comprise: the user of different districts uses different scramblers.
8. according to the transmission method of each described correct response message and/or error response message in the claim 1 to 4, it is characterized in that said correct response message and said error response message are respectively 1 bit.
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| KR100925440B1 (en) | 2008-01-28 | 2009-11-06 | 엘지전자 주식회사 | Method for allocating physical hybrid ARQ indicator channel |
| CN103095629B (en) * | 2011-11-01 | 2017-04-26 | 华为技术有限公司 | Method, device and system for transmitting and receiving data |
| CN107113118B (en) * | 2015-04-27 | 2020-01-31 | 华为技术有限公司 | Response message transmission method and network equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1434647A (en) * | 2001-10-19 | 2003-08-06 | 三星电子株式会社 | Device and method of data retransmission and decoding in CDMA mobile communication system |
| CN101127535A (en) * | 2006-08-18 | 2008-02-20 | 中兴通讯股份有限公司 | Implementation method for automatic retransfer response channel indication channel of time division synchronous code division multi-address system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1434647A (en) * | 2001-10-19 | 2003-08-06 | 三星电子株式会社 | Device and method of data retransmission and decoding in CDMA mobile communication system |
| CN101127535A (en) * | 2006-08-18 | 2008-02-20 | 中兴通讯股份有限公司 | Implementation method for automatic retransfer response channel indication channel of time division synchronous code division multi-address system |
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