CN102611666A - Outer loop link adaptive implementation method and device - Google Patents
Outer loop link adaptive implementation method and device Download PDFInfo
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- CN102611666A CN102611666A CN2011100265314A CN201110026531A CN102611666A CN 102611666 A CN102611666 A CN 102611666A CN 2011100265314 A CN2011100265314 A CN 2011100265314A CN 201110026531 A CN201110026531 A CN 201110026531A CN 102611666 A CN102611666 A CN 102611666A
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Abstract
The invention discloses an outer loop link adaptive implementation method and device, which solves the problem of the prior art that can not accurately select MCS (modulation coding scheme) in the case of inconsistent data region length of a downlink sub-frame. The method comprises dividing the downlink sub-frame into a plurality of sub-frame groups according to the rule that the number of OFDM (orthogonal frequency division multiplexing) symbols capable of transmitting data in the downlink sub-frame in the same sub-frame group belongs to the same predetermined number range and that the predetermined number ranges, to which the number of the OFDM symbols in the downlinks in different sub-frame group, are different from each other; measuring CQI (channel quality indicator) of the downlink sub-frame by a terminal, and determining a SINR (signal to interference plus noise ratio) value according to CQI; and executing the following steps for each sub-frame group: adjusting the SINR value to an SINR correction value according to an ACK/NACK (acknowledgement/negative acknowledgement) message fed back by the terminal according to the downlink sub-frame of the sub-frame group, and determining MCS scheduled to the downlink sub-frame of the terminal next time for transmitting downlink data according to the SINR correction value.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of outer shroud link circuit self-adapting implementation method and device.
Background technology
In the prior art; Substep code division multiple access (TD-SCDMA at that time; Time Division-Synchronous Code Division Multiple Access) DL/UL (downlink/uplink) business time-slot proportioning 4: 2 o'clock; If time-division Long Term Evolution (TD-LTE; Time Division Duplexing Long Time Evolution) system is adjacent will coexist with it frequently, and the TD-LTE system need adopt 3: 1 business time-slot proportioning, and DwPTS in the descending special subframe: protection time slot GP: up special subframe UpPTS length ratio is could fully avoid interference uplink and downlink timeslot between at 3: 9: 2.In order to improve the efficiency of transmission under this scene; Existing scheme proposes the DwPTS with the TD-LTE system: the ratio optimization of GP: UpPTS is 6: 6: 2; Thereby make DwPTS that 6 OFDM (OFDM arranged; Orthogonal Frequency Division Multiplexing) symbol can be used for downlink transfer, to improve descending efficiency of transmission.Wherein, comprise proportioning and be 6: 6: 2 DwPTS: the wireless frame structure sketch map of GP: UpPTS is please with reference to Fig. 1 a, and the arrow that makes progress among the figure is represented uplink, and downward arrow is represented downlink transfer.
In general, preceding 1 or 2 OFDM symbols in above-mentioned 6 OFDM symbols of DwPTS belong to the control area, are used to send PDCCH, PHICH; And remaining 4 or 5 OFDM symbols belong to the data area, are used to send downlink data.The data of sending in the data dispatching zone, control area of DwPTS.When TD-LTE adopts 3: 1 business time-slot proportioning; Because the downlink data that transmits among the DwPTS also can take a HARQ process; Therefore sub-frame of uplink need feed back ACK/NACK (confirming/unconfirmed) information of 4 descending time slots, so just causes the ACK/NACK of sub-frame of uplink to load bigger.
In order to solve the bigger problem of ACK/NACK load of the sub-frame of uplink that prior art exists; There is scheme to propose the descending conventional subframe of part OFDM symbol among the DwPTS with next-door neighbour DwPTS bundled; Form one " eldest son's frame ", and dispatch the downlink data transmission of whole eldest son's frame by the control area of this descending conventional subframe.Wherein, binding obtains should " eldest son's frame " sketch map shown in Fig. 1 b.When sending downlink data, the bit of a code word is mapped to all data symbols of this eldest son's frame, and decipher this code word after receiving whole eldest son's frame at the terminal.Mix automatic repeat requests (HARQ, Hybrid Automatic Repeat Request) process because this eldest son's frame only takies one, the terminal only need be to ACK/NACK information of this code word feedback.
Through the application of such scheme, two kinds of descending sub frames with different length have appearred in the radio frames.The descending sub frame of different length is different for the demodulation ability of identical Modulation and Coding Scheme (MCS, Modulation Coding Scheme) packet.But the descending conventional subframe of equal length that all is based on the outer shroud link adaptation techniques that provides in the prior art designs; If under the inconsistent situation of data area length of the descending sub frame that radio frames comprised, can produce the defective that accurately to choose MCS.
Summary of the invention
The embodiment of the invention provides a kind of outer shroud link adaptation techniques, in order to solve the problem that can't accurately choose MCS that under the inconsistent situation of data area length of the descending sub frame that radio frames comprised, produces that exists in the prior art.
The embodiment of the invention adopts following technical scheme:
A kind of outer shroud link circuit self-adapting implementation method; Comprise: the number of transmitting the orthogonal frequency division multiplex OFDM symbol of data according to the descending sub frame in the same subframe group can be used for of comprising is in same predetermined quantity scope; Belong to the mutually different division principle of the residing predetermined quantity scope of said number that the descending sub frame of different subframe groups comprises, the descending sub frame that comprises in the radio frames is divided obtained a plurality of subframe groups; And obtain the channel quality indicator (CQI) that the terminal measures descending sub frame, and confirm signal interference ratio SINR value according to CQI; And to each subframe group; Execution in step: each ACK/NACK message that the descending sub frame that this subframe group is comprised according to terminal pins feeds back; The SINR value is adjusted into the SINR correction value; And, confirm descending sub frame employed Modulation and Coding Scheme MCS when transmitting downlink data that scheduling next time comprises for this subframe group at this terminal according to the SINR correction value.
A kind of outer shroud link circuit self-adapting implement device; Comprise: subframe group division unit; The number that can be used for of being used for that descending sub frame according to same subframe group comprises transmitted the orthogonal frequency division multiplex OFDM symbol of data is in same predetermined quantity scope; Belong to the mutually different division principle of the residing predetermined quantity scope of said number that the descending sub frame of different subframe groups comprises, the descending sub frame that comprises in the radio frames is divided obtained a plurality of subframe groups; The channel quality indication obtains the unit, is used to obtain the channel quality indicator (CQI) that the terminal measures descending sub frame; The signal interference ratio value is confirmed the unit, is used for confirming signal interference ratio SINR value according to the CQI that channel quality indication acquisition unit obtains; Signal interference ratio value adjustment unit; Be used for dividing each the subframe group that obtains to subframe group division unit; Each ACK/NACK message that the descending sub frame that execution comprises this subframe group according to terminal pins feeds back confirms that with the signal interference ratio value SINR value that the unit is confirmed is adjusted into the SINR correction value; Modulation and Coding Scheme is confirmed the unit, is used for the SINR correction value that obtains according to signal interference ratio value adjustment unit, confirms descending sub frame employed Modulation and Coding Scheme MCS when transmitting downlink data that scheduling next time comprises for this subframe group at this terminal.
The beneficial effect of the embodiment of the invention is following:
The such scheme that the embodiment of the invention provides is divided into respectively in the different subframe groups through the subframe with different length; Different subframe groups are mapped to respectively on the different processes; And to arbitrary process, the CQI that comes according to terminal feedback determines the SINR value, and according to the ACK/NACK message of terminal pins to this progress feedback; The SINR value of determining is revised the back as choosing the foundation of MCS, thereby realized that the subframe that is respectively different length chooses corresponding M CS.Under the inconsistent situation of the data area of descending sub frame length, the scheme that the embodiment of the invention provides has reached the purpose of accurately choosing MCS.
Description of drawings
Fig. 1 a is that proportioning is the wireless frame structure sketch map of 6: 6: 2 DwPTS: GP: UpPTS;
Fig. 1 b is for bundling the sketch map of the eldest son's frame that obtains;
The idiographic flow sketch map of a kind of outer shroud link circuit self-adapting implementation method that Fig. 2 provides for the embodiment of the invention;
The concrete structure sketch map of a kind of outer shroud link circuit self-adapting implement device that Fig. 3 provides for the embodiment of the invention;
Scheme the concrete application flow sketch map in reality of Fig. 4 a for providing with the embodiment of the invention;
Fig. 4 b is the subframe group sketch map of dividing in the embodiment of the invention.
Embodiment
To the inconsistent situation of data area length of the descending sub frame that comprises in the radio frames, in order accurately to choose corresponding M CS, the embodiment of the invention provides a kind of outer shroud link circuit self-adapting implementation.The main thought of this scheme is; Descending sub frame to the different length that radio frames comprised is classified; The sub-frame division of same length in a sub-frame groups, and is mapped to different HARQ processes respectively with the different subframe groups that division obtains, thus the channel quality indication (CQI that according to terminal pins different HARQ progress feedback is come respectively; Channel Quality Indicator) and ACK/NACK information, employed MCS during the decision transmitting downlink data.
Below in conjunction with accompanying drawing, this scheme that the embodiment of the invention is provided is elaborated.
The embodiment of the invention at first provides a kind of outer shroud link circuit self-adapting implementation method as shown in Figure 2, and this method comprises the steps:
Step 21; The number of transmitting the OFDM symbol of data according to the descending sub frame in the same subframe group can be used for of comprising is in same predetermined quantity scope; Can be used for of belonging to that the descending sub frame of different subframe groups comprises, transmitted the mutually different division principle of the residing predetermined quantity scope of number of the OFDM symbol of data, the descending sub frame that comprises in the radio frames divided obtained a plurality of subframe groups;
Step 22 obtains the CQI that the terminal measures descending sub frame, and confirms the SINR value according to CQI; In this step 22; Can belong to the mutually different mapping principle of the HARQ process that descending sub frame shone upon of different subframe groups through being mapped on the same HARQ process, respectively the descending sub frame in the different subframe groups is mapped to the mode on the HARQ process according to all descending sub frames in the same subframe group; Utilize descending sub frame to user terminal to transmit data; And obtain the CQI that the terminal measures descending sub frame, wherein, the SINR value that the value of the CQI here measures descending sub frame by the terminal the MCS grade that obtains of mapping indicate;
Step 23; Carry out to each subframe group: each ACK/NACK message that the descending sub frame that this subframe group is comprised according to terminal pins feeds back; The SINR value is adjusted into the SINR correction value; And, confirm descending sub frame employed MCS when transmitting downlink data that scheduling next time comprises for this subframe group at this terminal according to the SINR correction value.
Wherein, With the SINR value be adjusted into the SINR correction value concrete operations can for: confirm earlier ACK message and NACK message in each ACK/NACK message of the descending sub frame feedback that this terminal pins comprises this subframe group; Then; Again the SINR value is added the sub-side-play amount that each definite ACK message is corresponding respectively, and deduct the corresponding respectively sub-side-play amount of each definite NACK message, thereby obtain the SINR correction value.
Corresponding to the said method that the embodiment of the invention provides, the embodiment of the invention also provides a kind of self adaptation implement device of outer shroud link, and the concrete structure sketch map of this device is as shown in Figure 3, comprises following functional unit:
Subframe group division unit 31; The number that can be used for of being used for that descending sub frame according to same subframe group comprises transmitted the orthogonal frequency division multiplex OFDM symbol of data is in same predetermined quantity scope; Belong to the mutually different division principle of the residing predetermined quantity scope of said number that the descending sub frame of different subframe groups comprises, the descending sub frame that comprises in the radio frames is divided obtained a plurality of subframe groups;
The channel quality indication obtains unit 32, is used to obtain the channel quality indicator (CQI) that the terminal measures descending sub frame;
The signal interference ratio value is confirmed unit 33, is used for confirming signal interference ratio SINR value according to the CQI that channel quality indication acquisition unit 32 obtains;
Signal interference ratio value adjustment unit 34; Be used for dividing each the subframe group that obtains to subframe group division unit 31; Each ACK/NACK message that the descending sub frame that execution comprises this subframe group according to terminal pins feeds back confirms that with the signal interference ratio value SINR values that unit 33 is confirmed are adjusted into the SINR correction value;
Modulation and Coding Scheme is confirmed unit 35, is used for the SINR correction value that obtains according to signal interference ratio value adjustment unit 34, confirms descending sub frame employed Modulation and Coding Scheme MCS when transmitting downlink data that scheduling next time comprises for this subframe group at this terminal.
In a preferred embodiment, above-mentioned signal interference ratio value adjustment unit 34 specifically can be divided into following functional module:
Determination module is used for confirming the ACK message and the NACK message of each ACK/NACK message;
The signal interference ratio value obtains module, is used for the SINR value is added the corresponding respectively sub-side-play amount of each ACK message that determination module is confirmed, and deducts the corresponding respectively sub-side-play amount of each NACK message that determination module is confirmed, obtains the SINR correction value.
Below the such scheme that provides with the embodiment of the invention be example in the concrete application flow (shown in Fig. 4 a) in the reality, introduce the implementation procedure of the such scheme that the embodiment of the invention provides in detail:
Such as, shown in Fig. 4 b, to the radio half frame of 5ms, can be with comprising latter two descending conventional sub-frame division of OFDM symbol that identical being used for transmit data to subframe group 1, and be divided into shown in Fig. 4 b " eldest son's frame " in the subframe group 2.In this case, N is 2.
Such as, to Fig. 4 b, subframe group 1 is mapped on the HARQ process 1, and subframe group 2 is mapped on the HARQ process 2.
Particularly, in step 43, to each HARQ process, the base station is to receive the indicated MCS of CQI that the ACK/NACK information of feeding back behind the descending sub frame that this HARQ process comprised is adjusted terminal to report according to the terminal.The step of adjustment MCS is following:
At first; The terminal can measure signal interference ratio (SINR, Signal to Interference plus Noise Ratio) value to each descending sub frame respectively, then according at least one the SINR value that measures; After a sub-frame of uplink on to base station feedback CQI; Such as, can be to averaging according to a plurality of SINR values that a plurality of descending sub frame measured respectively, the mean value that obtains is CQI;
Then, the base station is mapped as a SINR value with the CQI of terminal to report;
Then, to arbitrary HARQ process, the base station receives the ACK/NACK information of feeding back behind the descending sub frame under this HARQ process according to the terminal and adjusts this SINR value, promptly on this SINR value, adds a total drift amount to obtain a revised SINR value;
At last, the base station MCS that decides the descending sub frame in this HARQ process to use when the transmitting downlink data according to revised SINR value.In embodiments of the present invention, every kind of MCS is pairing can be a concrete SINR value, also can be that a SINR value is interval.Can corresponding [2.5db, 3.5dB] this SINR value interval such as, certain MCS 2, be in descending sub frame that the pairing HARQ process of this interval SINR value comprises when transmitting downlink data, all adopt MCS 2.
In the base station CQI is mapped as on the basis of a SINR value, above-mentioned latter two steps is carried out to different HARQ processes in the base station, the final MCS that uses when realizing confirming each HARQ process transmission downlink data respectively.
Need to prove; Above-mentioned total drift amount adds up; Promptly to same subframe group, its corresponding HARQ process can be carried out in difference respectively constantly, and the total drift amount of the current time side-play amount that just equals current time adds the total drift amount in a moment like this.And definite mode of sub-side-play amount is: if terminal pins is to the pairing HARQ progress feedback of this subframe group ACK, then should sub-side-play amount constantly be on the occasion of; If terminal pins is to the pairing HARQ progress feedback of this subframe group NACK, then the sub-side-play amount in this moment is a negative value.Wherein, the concrete size of sub-side-play amount is to set according to bLock error rate (BLER, the Block Error Ratio) desired value (BLERTarget) of the downlink data packet of transmitting the first time of default.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. an outer shroud link circuit self-adapting implementation method is characterized in that, comprising:
The number of transmitting the orthogonal frequency division multiplex OFDM symbol of data according to the descending sub frame in the same subframe group can be used for of comprising is in same predetermined quantity scope; Belong to the mutually different division principle of the residing predetermined quantity scope of said number that the descending sub frame of different subframe groups comprises, the descending sub frame that comprises in the radio frames is divided obtained a plurality of subframe groups; And
Obtain the channel quality indicator (CQI) that the terminal measures descending sub frame, and confirm signal interference ratio SINR value according to CQI; And
To each subframe group, carry out following step:
Each ACK/NACK message that the descending sub frame that this subframe group is comprised according to terminal pins feeds back; The SINR value is adjusted into the SINR correction value; And, confirm descending sub frame employed Modulation and Coding Scheme MCS when transmitting downlink data that scheduling next time comprises for this subframe group at this terminal according to the SINR correction value.
2. the method for claim 1 is characterized in that, according to said each ACK/NACK message, the SINR value is adjusted into the SINR correction value, specifically comprises:
Confirm ACK message and NACK message in said each ACK/NACK message;
The SINR value is added the sub-side-play amount that each definite ACK message is corresponding respectively, and deduct the corresponding respectively sub-side-play amount of each definite NACK message, obtain the SINR correction value.
3. the method for claim 1 is characterized in that, the value of said CQI is that the SINR value that the terminal measures descending sub frame is shone upon the MCS grade indication that obtains.
4. an outer shroud link circuit self-adapting implement device is characterized in that, comprising:
Subframe group division unit; The number that can be used for of being used for that descending sub frame according to same subframe group comprises transmitted the orthogonal frequency division multiplex OFDM symbol of data is in same predetermined quantity scope; Belong to the mutually different division principle of the residing predetermined quantity scope of said number that the descending sub frame of different subframe groups comprises, the descending sub frame that comprises in the radio frames is divided obtained a plurality of subframe groups;
The channel quality indication obtains the unit, is used to obtain the channel quality indicator (CQI) that the terminal measures descending sub frame;
The signal interference ratio value is confirmed the unit, is used for confirming signal interference ratio SINR value according to the CQI that channel quality indication acquisition unit obtains;
Signal interference ratio value adjustment unit; Be used for dividing each the subframe group that obtains to subframe group division unit; Each ACK/NACK message that the descending sub frame that execution comprises this subframe group according to terminal pins feeds back confirms that with the signal interference ratio value SINR value that the unit is confirmed is adjusted into the SINR correction value;
Modulation and Coding Scheme is confirmed the unit, is used for the SINR correction value that obtains according to signal interference ratio value adjustment unit, confirms descending sub frame employed Modulation and Coding Scheme MCS when transmitting downlink data that scheduling next time comprises for this subframe group at this terminal.
5. device as claimed in claim 4 is characterized in that, said signal interference ratio value adjustment unit specifically comprises:
Determination module is used for confirming the ACK message and the NACK message of said each ACK/NACK message;
The signal interference ratio value obtains module, is used for the SINR value is added the corresponding respectively sub-side-play amount of each ACK message that determination module is confirmed, and deducts the corresponding respectively sub-side-play amount of each NACK message that determination module is confirmed, obtains the SINR correction value.
6. device as claimed in claim 4 is characterized in that, the value of said CQI is that the SINR value that the terminal measures descending sub frame is shone upon the MCS grade indication that obtains.
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| WO2014094293A1 (en) * | 2012-12-21 | 2014-06-26 | 华为技术有限公司 | Method and device for acquiring channel quality indicator value |
| WO2014139089A1 (en) * | 2013-03-12 | 2014-09-18 | Empire Technology Development Llc | Self-adaptively improving system stability |
| CN104468027A (en) * | 2013-09-25 | 2015-03-25 | 株式会社日立制作所 | Base station device supporting data transmission based on high-order modulation and data communication method |
| CN104518842A (en) * | 2013-09-27 | 2015-04-15 | 普天信息技术研究院有限公司 | Method for adaptively adjusting modulation and coding scheme (MCS) |
| CN104936301A (en) * | 2014-03-21 | 2015-09-23 | 普天信息技术有限公司 | Downlink frequency selection scheduling method |
| WO2016055021A1 (en) * | 2014-10-10 | 2016-04-14 | Huawei Technologies Co., Ltd. | System and method for link adaptation |
| CN107332643A (en) * | 2016-04-29 | 2017-11-07 | 北京信威通信技术股份有限公司 | Link circuit self-adapting method of adjustment and device |
| CN110050425A (en) * | 2017-01-25 | 2019-07-23 | 华为技术有限公司 | The adaptive method of adjustment of outer loop link and device |
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| CN111149311A (en) * | 2017-06-30 | 2020-05-12 | 高通股份有限公司 | Uplink adaptation with one outer loop uplink adaptation instance per subframe set |
| WO2021217360A1 (en) * | 2020-04-27 | 2021-11-04 | 深圳市大疆创新科技有限公司 | Mcs adjustment method and device for sending end, unmanned aerial vehicle, and storage medium |
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| WO2014059910A1 (en) * | 2012-10-17 | 2014-04-24 | 中兴通讯股份有限公司 | Method and device for sending answer information |
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| CN110050425A (en) * | 2017-01-25 | 2019-07-23 | 华为技术有限公司 | The adaptive method of adjustment of outer loop link and device |
| CN110050425B (en) * | 2017-01-25 | 2020-12-22 | 华为技术有限公司 | Method and device for adjusting outer loop link adaptation |
| US11095393B2 (en) | 2017-01-25 | 2021-08-17 | Huawei Technologies Co., Ltd. | Outer loop link adaptation adjustment method and apparatus |
| CN111149311A (en) * | 2017-06-30 | 2020-05-12 | 高通股份有限公司 | Uplink adaptation with one outer loop uplink adaptation instance per subframe set |
| WO2020062022A1 (en) * | 2018-09-28 | 2020-04-02 | Intel Corporation | Machine learning-based link adaptation |
| US11637643B2 (en) | 2018-09-28 | 2023-04-25 | Intel Corporation | Machine learning-based link adaptation |
| WO2021217360A1 (en) * | 2020-04-27 | 2021-11-04 | 深圳市大疆创新科技有限公司 | Mcs adjustment method and device for sending end, unmanned aerial vehicle, and storage medium |
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