CN101615944B - Method for transmitting downlink channel response information and terminal - Google Patents
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Abstract
The invention relates to the field of wireless communication, and discloses a method for transmitting downlink channel response information and a terminal. In the invention, the detected downlink channel response information is subjected to first-order quantification in a plurality of frequency bands respectively and then transmitted so that the downlink channel response information can be separately transmitted to a base station more accurately. M pieces of maximum channel response information in the channel response can be firstly fed back, and then other channel response information is fed back; each piece of channel response information also can be transmitted in predetermined order; and each first-order quantification value of the downlink channel response information also can be transformed, main components in the transformation result are transmitted, and then secondary components are transmitted.
Description
Technical field
The present invention relates to wireless communication field, particularly channel estimation technique.
Background technology
In order to promote the power system capacity of wireless communication system, base station need to all adopt dynamic scheduling of resource technology in down link and up link, and this just needs base station to understand the channel response information of descending and up link.In current communication system, the down channel quality indication information that base station is returned by terminal (Channel Quality Information, abbreviation " CQI ") understand the operable code modulation mode of current terminal down link, the joint effect that wherein CQI has comprised channel response C and interference I, can correctly think that CQI is the monotonic function of C/I.
The indication of up-downgoing channel quality is estimated generation and operational version as shown in Figure 1.In Fig. 1, terminal, according to descending pilot frequency, measures Cdl (downlink channel response information), Idl (descending interfere information), calculate CQIdl (descending CQI), then report CQIdl to base station, according to base station indication, send uplink detection signal simultaneously.Base station, according to uplink detection signal, measures Cul (up channel response message), and base station measures Iul (uplink interference information) at up unallocated running time-frequency resource place simultaneously.Finally, uplink scheduling and downlink transmitting and dispatching are carried out according to the CQIul (up CQI) calculating voluntarily and the CQIdl (descending CQI) of terminal to report in base station.
In TDD communication system (United States Patent (USP) that the wireless communication system of TDD can be 6226276 referring to the patent No.), base station can utilize the symmetry (reciprocity) of space channel to simplify the work of channel estimating, that is to say, if base station can get downlink channel response Cdl, just can obtain up channel response Cul according to Cdl, thereby according to this Cul and the Iul measuring, calculate up CQI, carry out uplink scheduling.As can be seen here, if utilize the symmetry of space channel to simplify the work of channel estimating, just need terminal feedback downlink channel response information Cdl, yet, in current prior art, how terminal is not fed back to Cdl and propose a kind of concrete scheme.
Summary of the invention
The object of the present invention is to provide a kind of method for transmitting downlink channel response information and terminal, downlink channel response information can be transferred to base station comparatively exactly.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of method for transmitting downlink channel response information, comprise the following steps:
System bandwidth is divided into N frequency band, N > 1;
Terminal is carried out single order quantification to downlink channel response information respectively on each frequency band, obtains N single order quantized value;
The information that represents N single order quantized value is sent to base station.
Embodiments of the present invention also provide a kind of terminal, comprising:
Frequency band division unit, for being divided into system bandwidth N frequency band, N > 1;
Quantifying unit, for respectively downlink channel response information being carried out to single order quantification on each frequency band of determining in frequency band division unit, obtains N single order quantized value;
Transmitting element, for sending the information that represents N single order quantized value of quantifying unit gained to base station.
Compared with prior art, the main distinction and effect thereof are embodiment of the present invention:
To the downlink channel response information recording, divide a plurality of frequency bands to carry out respectively after single order quantizes sending, make the downlink channel response information can be by individual transmission comparatively exactly to base station.For TDD system, the calculating that makes base station utilize the symmetry of TDD system up-downgoing to simplify up CQI becomes possibility.
Further, first M maximum channel response message in feedback channel response, can provide the best frequency domain of channel condition channel response partly as early as possible to base station, facilitates base station to dispatch early
Further, with predetermined order, send each single order quantized value, can transmit the information of the corresponding frequency band of each single order quantized value, reduced the amount of information that needs transmission.
Further, by each single order quantized value to downlink channel response information, convert, first pass the fundamental component in transformation results, can to base station, provide as early as possible the main profile of downlink channel response information, facilitate base station to dispatch early.
Further, by only sending the channel response on assigned frequency band, can reduce the data volume of transmission, especially in the situation that the RF capabilities of terminal is less than whole system bandwidth, not need to know that the channel response in whole system bandwidth just can carry out transmitting and scheduling for terminal.
Further, the mode divided band with wide, deals with fairly simple.
Further, situation of change by downlink channel response information on frequency domain is determined the dividing mode of each frequency band, can draw narrowlyer in the violent place of variation, change smooth place and draw widelyr, thereby obtain quantified precision and want trading off between transmitted data amount.
Accompanying drawing explanation
Fig. 1 is that in prior art, the indication of up-downgoing channel quality is estimated to produce and operational version schematic diagram;
Fig. 2 is the method for transmitting downlink channel response information flow chart according to first embodiment of the invention;
Fig. 3 is the downlink channel response information schematic diagram according to first embodiment of the invention;
Fig. 4 is the method for transmitting downlink channel response information flow chart according to third embodiment of the invention;
Fig. 5 is the terminal structure schematic diagram according to sixth embodiment of the invention.
Embodiment
In the following description, in order to make reader understand the application better, many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs and the many variations based on following execution mode and modification, also can realize each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of method for transmitting downlink channel response information, specifically as shown in Figure 2.
In step 210, terminal is divided into N frequency band, N > 1 by system bandwidth.In this step, with wide mode divided band, can make like this to deal with fairly simple.As shown in Figure 3, whole system frequency band is divided into seven frequency bands (being N=7) such as A, B, C, D, E, F and G.
Then, in step 220, terminal is carried out single order quantification to downlink channel response information CdI respectively on each frequency band, obtains N single order quantized value.As shown in Figure 3, the quantization value table in each frequency band is shown the level of horizontal dotted line representative, can obtain 7 single order quantized values.
Then,, in step 230, by special-purpose channel, the information that represents N single order quantized value is sent to base station.Specifically, M maximum single order quantized value be can first send, then each remaining single order quantized value, wherein 1≤M < N sent.By M maximum channel response message in the response of feedback channel first, the best frequency domain of channel condition channel response partly can be provided to base station as early as possible, facilitate base station to dispatch early.Such as in the example shown in Fig. 3, if M=3, first terminal feeds back the channel information of B, C, A, is then D, G, E, F etc.
Due in the present embodiment, to the Cdl recording, divide a plurality of frequency bands to carry out respectively after single order quantizes sending, make the Cdl can be by individual transmission comparatively exactly to base station.For TDD system, the calculating that makes base station utilize the symmetry of TDD system up-downgoing to simplify up CQI becomes possibility.
Second embodiment of the invention relates to a kind of method for transmitting downlink channel response information, and present embodiment and the first execution mode are basic identical, and difference is mainly:
In the first embodiment, in the step that the information that represents N single order quantized value is sent to base station (being in step 230), first send M maximum single order quantized value, then send each remaining single order quantized value.Yet in the present embodiment, with predetermined order, send successively N single order quantized value.Such as, with the order of A, B, C, D, E, F, G from left to right, send successively N single order quantized value, or send successively N single order quantized value with the order of G, F, E, D, C, B, A from right to left.
With predetermined order, send each single order quantized value, can transmit the information of the corresponding frequency band of each single order quantized value, reduced the amount of information that needs transmission.
Third embodiment of the invention relates to a kind of method for transmitting downlink channel response information, and present embodiment and the first execution mode are basic identical, and difference is mainly:
Directly send in the first embodiment single order quantized value, and in the 3rd execution mode, advanced line translation sends transformation results again to single order quantized value.
Specifically, further comprising the steps of before the step information that represents N single order quantized value being sent to base station:
The conversion that N single order quantized value is scheduled to, using the transformation results of gained as the information that represents N single order quantized value.As shown in Figure 4, step 410,420 respectively with step 210,220 identical, in step 430, the conversion that N single order quantized value is scheduled to, using the transformation results of gained as the information that represents N single order quantized value.
In step 440, the information that represents N single order quantized value is sent to base station.Can first send the fundamental component in transformation results, then send the less important component in transformation results.
By each single order quantized value to Cdl, convert, first pass the fundamental component in transformation results, can to base station, provide as early as possible the main profile of CdI, facilitate base station to dispatch early.
Predetermined map can be fast Fourier transform (Fast Fourier Transform, abbreviation " FFT ") conversion, discrete cosine transform (Discrete Cosine Transform, abbreviation " DCT ") conversion, wavelet transformation, can be also other conversion.
Four embodiment of the invention relates to a kind of method for transmitting downlink channel response information, and present embodiment and the first execution mode are basic identical, and difference is mainly:
In the first embodiment the Cdl of each frequency band in system bandwidth is all sent to base station; And only send in the present embodiment the Cdl of one or more frequency bands of appointment.
Specifically, in the 4th execution mode, in the step that the information that represents N single order quantized value is sent to base station, according to the signaling of base station, only send the single order quantized value of the Cdl on the frequency band of this signaling appointment.
In addition, be appreciated that can not be also signaling appointment, but make an appointment, but only pass the single order quantized value of the Cdl on one or more frequency bands of appointment, or the transformation results of these single order quantized values after certain conversion.
It should be noted that, in present embodiment, the radio frequency bandwidth of terminal is less than the radio frequency bandwidth of base station.
By only sending the channel response on assigned frequency band, can reduce the data volume of transmission, especially in the situation that the RF capabilities of terminal is less than whole system bandwidth, do not need to know that the channel response in whole system bandwidth just can carry out transmitting and scheduling for terminal.
Fifth embodiment of the invention relates to a kind of method for transmitting downlink channel response information.
The 5th execution mode improves first to fourth execution mode.In first to fourth execution mode, each frequency band is equiband, and in the 5th execution mode, N frequency band is not wide.
Specifically, system bandwidth is being divided in the step of N frequency band, the situation of change according to Cdl on frequency domain is determined the bandwidth of each frequency band.
Situation of change by Cdl on frequency domain is determined the dividing mode of each frequency band, can draw narrowlyer in the violent place of variation, changes smooth place and draws widelyr, thereby obtain quantified precision and want trading off between transmitted data amount.
In addition, be appreciated that, in a concrete example, the situation of change of Cdl on frequency domain can represent by an index that characterizes variation severe degree, when this index is greater than Upper threshold, original frequency band can be refined as to a plurality of narrower frequency bands, when this index is less than Lower Threshold, original a plurality of nearby frequency bands can be merged into a wider frequency band.
Method execution mode of the present invention can be realized in software, hardware, firmware etc. mode.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the memory of computer-accessible of any type (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, medium fixing or that change etc.).Equally, memory can be for example programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Sixth embodiment of the invention relates to a kind of terminal, as shown in Figure 5, comprising:
Frequency band division unit, for being divided into system bandwidth N frequency band, N > 1.In present embodiment, each frequency band is equiband.
Quantifying unit, for respectively Cdl being carried out to single order quantification on each frequency band of determining in frequency band division unit, obtains N single order quantized value.
Transmitting element, for sending the information that represents N single order quantized value of quantifying unit gained to base station.
To the Cdl recording, divide a plurality of frequency bands to carry out respectively after single order quantizes sending, make the Cdl can be by individual transmission comparatively exactly to base station.
In addition, be appreciated that, also has channel estimating unit, for down channel is estimated, obtain the downlink channel response curve on frequency domain, and display screen, keyboard, antenna etc. are as a functional unit that terminal is required, because not too large with main inventive point relation of the present invention, so do not enumerated, not shown in Figure 5 yet.
It is worth mentioning that, the transmitting element in present embodiment first sends M maximum single order quantized value, then sends each remaining single order quantized value, wherein 1≤M < N.
First M maximum channel response message in feedback channel response, can provide the best frequency domain of channel condition channel response partly as early as possible to base station, facilitates base station to dispatch early.
The first execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first execution mode.
Seventh embodiment of the invention relates to a kind of terminal, and present embodiment and the 6th execution mode are basic identical, and difference is mainly:
In the 6th execution mode, transmitting element first sends M maximum single order quantized value, then sends each remaining single order quantized value.Yet in the present embodiment, transmitting element sends N single order quantized value successively with predetermined order.
With predetermined order, send each single order quantized value, can transmit the information of the corresponding frequency band of each single order quantized value, reduced the amount of information that needs transmission.
The second execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the second execution mode.The correlation technique details of mentioning in the second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the second execution mode.
Eighth embodiment of the invention relates to a kind of terminal, and present embodiment and the 6th execution mode are basic identical, and difference is mainly:
In the 6th execution mode, directly send the single order quantized value of Cdl, and in the 8th execution mode, these single order quantized values are converted, and preferentially send the fundamental component in transformation results.
In the 8th execution mode, also comprise converter unit, for the conversion that N single order quantized value is scheduled to, using the transformation results of gained as the information that represents N single order quantized value.
Transmitting element first sends the fundamental component in converter unit gained transformation results, then sends the less important component in transformation results.
Predetermined map can be one of following:
FFT conversion, dct transform, wavelet transformation.
By each single order quantized value to Cdl, convert, first pass the fundamental component in transformation results, can to base station, provide as early as possible the main profile of Cdl, facilitate base station to dispatch early.
The 3rd execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the 3rd execution mode.The correlation technique details of mentioning in the 3rd execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the 3rd execution mode.
Ninth embodiment of the invention relates to a kind of terminal, present embodiment is improved the 6th, the 7th, on the basis of the 8th execution mode, six, in the 7th, the 8th execution mode, each frequency band is all equiband, and in the 9th execution mode, N frequency band is not wide.
Frequency band division unit according to Cdl the situation of change on frequency domain determine the bandwidth of each frequency band.
Situation of change by Cdl on frequency domain is determined the dividing mode of each frequency band, can draw narrowlyer in the violent place of variation, changes smooth place and draws widelyr, thereby obtain quantified precision and want better trading off between transmitted data amount.
The 5th execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the 5th execution mode.The correlation technique details of mentioning in the 5th execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the 5th execution mode.
It should be noted that, each unit of mentioning in terminal execution mode of the present invention (the 6th to the 9th execution mode) is all logical block, physically, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of a plurality of physical locations, the physics realization mode of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, the above-mentioned terminal execution mode of the present invention is not introduced the unit not too close with solving technical problem relation proposed by the invention, and this does not show that the said equipment execution mode does not exist other unit
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and described, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (18)
1. a method for transmitting downlink channel response information, is characterized in that, comprises the following steps:
System bandwidth is divided into N frequency band, N > 1;
Terminal is carried out single order quantification to downlink channel response information respectively on each frequency band, obtains N single order quantized value;
The information that represents described N single order quantized value is sent to base station, wherein, first send M maximum single order quantized value, then send each remaining single order quantized value, wherein 1≤M < N.
2. method for transmitting downlink channel response information according to claim 1, is characterized in that, in the step that the information that represents described N single order quantized value is sent to base station,
According to the signaling of base station, only send the single order quantized value of the downlink channel response information on the frequency band of this signaling appointment.
3. method for transmitting downlink channel response information according to claim 2, is characterized in that, the radio frequency bandwidth of described terminal is less than the radio frequency bandwidth of described base station.
4. according to the method for transmitting downlink channel response information described in any one in claims 1 to 3, it is characterized in that, a described N frequency band is wide.
5. according to the method for transmitting downlink channel response information described in any one in claims 1 to 3, it is characterized in that, a described N frequency band is not wide.
6. method for transmitting downlink channel response information according to claim 5, is characterized in that, in the described step that system bandwidth is divided into N frequency band,
Situation of change according to described downlink channel response information on frequency domain is determined the bandwidth of each frequency band.
7. a method for transmitting downlink channel response information, is characterized in that, comprises the following steps:
System bandwidth is divided into N frequency band, N > 1;
Terminal is carried out single order quantification to downlink channel response information respectively on each frequency band, obtains N single order quantized value;
To described N the conversion that single order quantized value is scheduled to, using the transformation results of gained as the information that represents described N single order quantized value;
The information that represents described N single order quantized value is sent to base station, wherein, first send the fundamental component in described transformation results, then send the less important component in described transformation results.
8. method for transmitting downlink channel response information according to claim 7, is characterized in that, described predetermined map can be one of following:
Fast Fourier transform, discrete cosine transform, wavelet transformation.
9. method for transmitting downlink channel response information according to claim 7, is characterized in that, in the step that the information that represents described N single order quantized value is sent to base station,
According to the signaling of base station, only send the single order quantized value of the downlink channel response information on the frequency band of this signaling appointment.
10. method for transmitting downlink channel response information according to claim 9, is characterized in that, the radio frequency bandwidth of described terminal is less than the radio frequency bandwidth of described base station.
11. according to the method for transmitting downlink channel response information described in any one in claim 7 to 10, it is characterized in that, a described N frequency band is wide.
12. according to the method for transmitting downlink channel response information described in any one in claim 7 to 10, it is characterized in that, a described N frequency band is not wide.
13. method for transmitting downlink channel response information according to claim 12, is characterized in that, in the described step that system bandwidth is divided into N frequency band,
Situation of change according to described downlink channel response information on frequency domain is determined the bandwidth of each frequency band.
14. 1 kinds of downlink channel response information transmission terminals, is characterized in that, comprising:
Frequency band division unit, for being divided into system bandwidth N frequency band, N > 1;
Quantifying unit, for respectively downlink channel response information being carried out to single order quantification on each frequency band of determining in described frequency band division unit, obtains N single order quantized value;
Transmitting element, for sending the information that represents N single order quantized value of described quantifying unit gained to base station; Described transmitting element first sends M maximum single order quantized value, then sends each remaining single order quantized value, wherein 1≤M < N.
15. downlink channel response information transmission terminals according to claim 14, is characterized in that, a described N frequency band is not wide;
Described frequency band division unit according to described downlink channel response information the situation of change on frequency domain determine the bandwidth of each frequency band.
16. 1 kinds of downlink channel response information transmission terminals, is characterized in that, comprising:
Frequency band division unit, for being divided into system bandwidth N frequency band, N > 1;
Quantifying unit, for respectively downlink channel response information being carried out to single order quantification on each frequency band of determining in described frequency band division unit, obtains N single order quantized value;
Transmitting element, for sending the information that represents N single order quantized value of described quantifying unit gained to base station;
Converter unit, for to described N the conversion that single order quantized value is scheduled to, using the transformation results of gained as the information that represents described N single order quantized value;
Described transmitting element first sends the fundamental component in described converter unit gained transformation results, then sends the less important component in transformation results.
17. downlink channel response information transmission terminals according to claim 16, is characterized in that,
Described predetermined map can be one of following:
Fast Fourier transform, discrete cosine transform, wavelet transformation.
18. according to the downlink channel response information transmission terminal described in claim 16 or 17, it is characterized in that, a described N frequency band is not wide;
Described frequency band division unit according to described downlink channel response information the situation of change on frequency domain determine the bandwidth of each frequency band.
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| CN101073206A (en) * | 2004-12-07 | 2007-11-14 | 昂达博思公司 | Method and system for switching antenna and channel assignments in broadband wireless networks |
| CN101079859A (en) * | 2006-05-26 | 2007-11-28 | 上海原动力通信科技有限公司 | Frequency domain dispatching method and device |
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| CN101073206A (en) * | 2004-12-07 | 2007-11-14 | 昂达博思公司 | Method and system for switching antenna and channel assignments in broadband wireless networks |
| CN101079859A (en) * | 2006-05-26 | 2007-11-28 | 上海原动力通信科技有限公司 | Frequency domain dispatching method and device |
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Application publication date: 20091230 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: 2018990000163 Denomination of invention: Method for transmitting downlink channel response information and terminal Granted publication date: 20140312 License type: Exclusive License Record date: 20180626 |
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Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: 2018990000163 Date of cancellation: 20210301 |
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Application publication date: 20091230 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Contract record no.: X2021110000010 Denomination of invention: Downlink channel response information transmission method and terminal Granted publication date: 20140312 License type: Exclusive License Record date: 20210317 |
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