CN102611666B - Outer loop link adaptive implementation method and device - Google Patents
Outer loop link adaptive implementation method and device Download PDFInfo
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- CN102611666B CN102611666B CN201110026531.4A CN201110026531A CN102611666B CN 102611666 B CN102611666 B CN 102611666B CN 201110026531 A CN201110026531 A CN 201110026531A CN 102611666 B CN102611666 B CN 102611666B
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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, as TD SDMA (TD-SCDMA, TimeDivision-Synchronous Code Division Multiple Access) DL/UL(downlink/uplink) during business time-slot proportioning 4:2, if time-division Long Term Evolution (TD-LTE, Time Division DuplexingLong Time Evolution) system adjacent frequency will coexist with it, TD-LTE system need to adopt the business time-slot proportioning of 3:1, and DwPTS in descending special subframe: protection time slot GP: up special subframe UpPTS length ratio is that 3:9:2 could avoid the interference between uplink and downlink timeslot completely.In order to improve the efficiency of transmission under this scene, it is 6:6:2 by the ratio optimization of the DwPTS:GP:UpPTS of TD-LTE system that existing scheme proposes, thereby make DwPTS have 6 OFDM (OFDM, OrthogonalFrequency Division Multiplexing) symbol can be used for downlink transfer, to improve descending efficiency of transmission.Wherein, the wireless frame structure schematic diagram that comprises proportioning and be the DwPTS:GP:UpPTS of 6:6:2 please refer to Fig. 1 a, and the arrow making progress in figure represents uplink, and downward arrow represents downlink transfer.
In general, front 1 or 2 OFDM symbols in above-mentioned 6 OFDM symbols of DwPTS belong to control area, for sending PDCCH, PHICH; And remaining 4 or 5 OFDM symbols belong to data area, for sending downlink data.The data that send in the data dispatching region, control area of DwPTS.When TD-LTE adopts the business time-slot proportioning of 3:1, because the downlink data transmitting in DwPTS also can take a HARQ process, therefore the ACK/NACK(that sub-frame of uplink need to feed back 4 descending time slots confirms/unconfirmed) information, so just cause the ACK/NACK of sub-frame of uplink to load larger.
In order to solve the larger problem of ACK/NACK load of the sub-frame of uplink of prior art existence, there is scheme to propose part OFDM symbol in DwPTS and the descending conventional subframe of next-door neighbour DwPTS to bundle, form one " eldest son's frame ", and sent by the downlink data that whole eldest son's frame is dispatched in the control area of this descending conventional subframe.Wherein, the schematic diagram that is somebody's turn to do " eldest son's frame " that binding obtains as shown in Figure 1 b.When sending downlink data, the bit mapping of a code word is to all data symbols of this eldest son's frame, and terminal is carried out decoding to this code word after receiving whole eldest son's frame.Because this eldest son's frame only takies a mixed automatic retransfer request (HARQ, Hybrid Automatic Repeat Request) process, terminal only need be for an ACK/NACK information of this code word feedback.
By the application of such scheme, two kinds of descending sub frames with different length in radio frames, have been there are.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 outer shroud link adaptation techniques providing in prior art is all the descending conventional subframe based on equal length to be designed, if in the inconsistent situation of data area length of the descending sub frame comprising in radio frames, can produce the defect that cannot accurately choose MCS.
Summary of the invention
The embodiment of the present invention provides a kind of outer shroud link adaptation techniques, in order to solve the problem that cannot accurately choose MCS producing in the inconsistent situation of data area length of the descending sub frame comprising in radio frames existing in prior art.
The embodiment of the present invention is by the following technical solutions:
A kind of outer shroud link circuit self-adapting implementation method, comprise: can be used for of comprising according to the descending sub frame in same subframe group transmitted the number of orthogonal frequency division multiplex OFDM symbol of data in same predetermined quantity scope, belong to the mutually different division principle of the residing predetermined quantity scope of described number that the descending sub frame of different subframe groups comprises, the descending sub frame comprising in radio frames is divided and obtained a plurality of subframe groups; And obtain the channel quality indicator (CQI) that terminal measures descending sub frame, and determine signal interference ratio SINR value according to CQI; And for each subframe group, execution step: each ACK/NACK message of the descending sub frame feedback this subframe group being comprised according to terminal pins, SINR value is adjusted into SINR correction value, and according to SINR correction value, determine and to dispatch the Modulation and Coding Scheme MCS that descending sub frame that this subframe group to this terminal comprises is used when transmitting downlink data next time.
A kind of outer shroud link circuit self-adapting implement device, comprise: subframe group division unit, for can be used for of comprising according to the descending sub frame of same subframe group, transmit the number of orthogonal frequency division multiplex OFDM symbol of data in same predetermined quantity scope, belong to the mutually different division principle of the residing predetermined quantity scope of described number that the descending sub frame of different subframe groups comprises, the descending sub frame comprising in radio frames is divided and obtained a plurality of subframe groups; Channel quality indication obtains unit, channel quality indicator (CQI) descending sub frame being measured for obtaining terminal; Signal interference ratio value determining unit, determines signal interference ratio SINR value for the CQI obtaining according to channel quality indication acquisition unit; Signal interference ratio value adjustment unit, for divide each the subframe group obtaining for subframe group division unit, each ACK/NACK message of the descending sub frame feedback that execution comprises this subframe group according to terminal pins, the SINR value that signal interference ratio value determining unit is definite is adjusted into SINR correction value; Modulation and Coding Scheme determining unit, for the SINR correction value obtaining according to signal interference ratio value adjustment unit, determines and to dispatch the Modulation and Coding Scheme MCS that descending sub frame that this subframe group to this terminal comprises is used when transmitting downlink data next time.
The beneficial effect of the embodiment of the present invention is as follows:
The such scheme that the embodiment of the present invention provides is by being divided into the subframe of different length respectively in different subframe groups, different subframe groups are mapped to respectively in different processes, and for arbitrary process, the CQI coming according to terminal feedback determines SINR value, and according to terminal pins the ACK/NACK message to this progress feedback, the SINR value of determining is revised to the foundation that MCS is chosen in rear conduct, thereby realized the subframe that is respectively different length, choose corresponding MCS.In the inconsistent situation of the data area of descending sub frame length, the scheme that the embodiment of the present invention provides has reached the object of accurately choosing MCS.
Accompanying drawing explanation
Fig. 1 a is that proportioning is the wireless frame structure schematic diagram of the DwPTS:GP:UpPTS of 6:6:2;
Fig. 1 b is for bundling the schematic diagram of the eldest son's frame obtaining;
The idiographic flow schematic diagram of a kind of outer shroud link circuit self-adapting implementation method that Fig. 2 provides for the embodiment of the present invention;
The concrete structure schematic diagram of a kind of outer shroud link circuit self-adapting implement device that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 a is the scheme that provides with a embodiment of the present invention concrete application flow schematic diagram in practice;
Fig. 4 b is the subframe group schematic diagram of dividing in the embodiment of the present invention.
Embodiment
For the inconsistent situation of data area length of the descending sub frame comprising in radio frames, in order accurately to choose corresponding MCS, the embodiment of the present invention provides a kind of outer shroud link circuit self-adapting implementation.The main thought of this scheme is, the descending sub frame of the different length that radio frames is comprised is classified, by in the sub-frame division to of a same length subframe group, and the different subframe groups that division is obtained are mapped to respectively different HARQ processes, thereby the channel quality according to terminal pins, different HARQ progress feedback being come respectively indication (CQI, the MCS using while Channel Quality Indicator) and ACK/NACK information, determining transmitting downlink data.
Below in conjunction with accompanying drawing, this scheme that the embodiment of the present invention is provided is elaborated.
First the embodiment of the present invention provides a kind of outer shroud link circuit self-adapting implementation method as shown in Figure 2, and the method comprises the steps:
Step 21, can be used for of comprising according to the descending sub frame in same subframe group, is transmitted the number of OFDM symbol of data in same predetermined quantity scope, can be used for of belonging to that the descending sub frame of different subframe groups comprises, is transmitted the mutually different division principle of the residing predetermined quantity scope of number of the OFDM symbol of data, and the descending sub frame comprising in radio frames is divided and obtained a plurality of subframe groups;
Step 22, obtain the CQI that terminal measures descending sub frame, and determine SINR value according to CQI, in this step 22, can be mapped to by all descending sub frames according in same subframe group in same HARQ process, belong to the mutually different mapping principle of HARQ process that the descending sub frame of different subframe groups shines upon, respectively the descending sub frame in different subframe groups is mapped to the mode in HARQ process, utilize descending sub frame to user terminal to transmit data, and obtain the CQI that terminal measures descending sub frame, wherein, the SINR value that the value of the CQI here measures descending sub frame by terminal the MCS grade indication that obtains of mapping,
Step 23, for each subframe group, carry out: each ACK/NACK message of the descending sub frame feedback this subframe group being comprised according to terminal pins, SINR value is adjusted into SINR correction value, and according to SINR correction value, determine and to dispatch the MCS that descending sub frame that this subframe group to this terminal comprises is used when transmitting downlink data next time.
Wherein, the concrete operations that SINR value are adjusted into SINR correction value can be: ACK message and NACK message in each ACK/NACK message of the descending sub frame feedback that first definite this terminal pins comprises this subframe group, then, again SINR value is added to each definite ACK message sub-side-play amount of correspondence respectively, and deduct each definite NACK message sub-side-play amount of correspondence respectively, thereby obtain SINR correction value.
The said method providing corresponding to the embodiment of the present invention, the embodiment of the present invention also provides a kind of self adaptation implement device of outer central link, and the concrete structure schematic diagram of this device as shown in Figure 3, comprises following functions unit:
Subframe group division unit 31, for can be used for of comprising according to the descending sub frame of same subframe group, transmit the number of orthogonal frequency division multiplex OFDM symbol of data in same predetermined quantity scope, belong to the mutually different division principle of the residing predetermined quantity scope of described number that the descending sub frame of different subframe groups comprises, the descending sub frame comprising in radio frames is divided and obtained a plurality of subframe groups;
Channel quality indication obtains unit 32, channel quality indicator (CQI) descending sub frame being measured for obtaining terminal;
Signal interference ratio value determining unit 33, determines signal interference ratio SINR value for the CQI obtaining according to channel quality indication acquisition unit 32;
Signal interference ratio value adjustment unit 34, for dividing for subframe group division unit 31 each the subframe group obtaining, each ACK/NACK message of the descending sub frame feedback that execution comprises this subframe group according to terminal pins, the SINR value that signal interference ratio value determining unit 33 is definite is adjusted into SINR correction value;
Modulation and Coding Scheme determining unit 35, for the SINR correction value obtaining according to signal interference ratio value adjustment unit 34, determines and to dispatch the Modulation and Coding Scheme MCS that descending sub frame that this subframe group to this terminal comprises is used when transmitting downlink data next time.
In a preferred embodiment, above-mentioned signal interference ratio value adjustment unit 34 specifically can be divided into following functions module:
Determination module, for determining ACK message and the NACK message of each ACK/NACK message;
Signal interference ratio value obtains module, for SINR value being added to each definite ACK message of determination module side-play amount of correspondence respectively, and deducts each definite NACK message of determination module side-play amount of correspondence respectively, obtains SINR correction value.
The such scheme that the embodiment of the present invention of take below provides a concrete application flow (as shown in Fig. 4 a) is in practice example, introduces in detail the implementation procedure of the such scheme that the embodiment of the present invention provides:
Step 41, first, the number according to can be used as transmitting the OFDM symbol of data in subframe, is divided into N(N>=2 all descending sub frames) individual subframe group;
Such as, as shown in Figure 4 b, for the radio half frame of 5ms, can by comprise identical for latter two descending conventional sub-frame division of OFDM symbol of transmitting data to subframe group 1, and shown in Fig. 4 b " eldest son's frame " is divided in subframe group 2.In this case, N is 2.
Step 42, is mapped in same process according to all subframes in same subframe group, and the subframe in different subframe groups is mapped to the mapping ruler in different HARQ processes, and N subframe group is mapped to respectively in N HARQ process;
Such as, for Fig. 4 b, subframe group 1 is mapped in HARQ process 1, and subframe group 2 is mapped in HARQ process 2.
Step 43, for each HARQ process, carries out respectively the operation of outer shroud link circuit self-adapting, with the MCS that determines that transmitting downlink data is used.
Particularly, in step 43, for each HARQ process, base station is to receive according to terminal the indicated MCS of CQI that the ACK/NACK information of feeding back after the descending sub frame that this HARQ process comprises is adjusted terminal to report.The step of adjusting MCS is as follows:
First, terminal can measure signal interference ratio (SINR for each descending sub frame respectively, Signalto Interference plus Noise Ratio) value, then according at least one the SINR value measuring, after a sub-frame of uplink on to base station feedback CQI, such as, can average a plurality of SINR values that measure respectively according to a plurality of descending sub frames, the mean value obtaining is CQI;
Then, base station is mapped as a SINR value by the CQI of terminal to report;
Then, for arbitrary HARQ process, base station receives according to terminal the ACK/NACK information of feeding back after descending sub frame under this HARQ process and adjusts this SINR value, in this SINR value, adds and a total drift amount obtains a revised SINR value;
Finally, the MCS that base station decides 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 corresponding can be a concrete SINR value, can be also that a SINR value is interval.Such as, certain MCS2 can corresponding [2.5db, 3.5dB] this SINR value interval, the descending sub frame comprising in the corresponding HARQ process of this interval SINR value during in transmitting downlink data, all adopts MCS2.
In base station, CQI is mapped as on the basis of a SINR value, above-mentioned latter two steps, the final MCS using while determining each HARQ process transmission downlink data respectively that realizes are carried out for different HARQ processes in base station.
It should be noted that, above-mentioned total drift amount adds up, for same subframe group, its corresponding HARQ process can not carried out respectively in the same time, and the sub-side-play amount that the total drift amount of current time just equals current time like this adds the total drift amount in a moment.And definite mode of sub-side-play amount is: if terminal pins to the corresponding HARQ progress feedback of this subframe group ACK, this sub-side-play amount be constantly on the occasion of; If terminal pins is to the corresponding HARQ progress feedback of this subframe group NACK, the sub-side-play amount in this moment is 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 transmission for the first time of default.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also 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:
Can be used for of comprising according to the descending sub frame in same subframe group, is transmitted the number of orthogonal frequency division multiplex OFDM symbol of data in same predetermined quantity scope, belong to the mutually different division principle of the residing predetermined quantity scope of described number that the descending sub frame of different subframe groups comprises, the descending sub frame comprising in radio frames is divided and obtained a plurality of subframe groups; And
Obtain the channel quality indicator (CQI) that terminal measures descending sub frame, and determine signal interference ratio SINR value according to CQI; And
For each subframe group, carry out following step:
Each ACK/NACK message of the descending sub frame feedback this subframe group being comprised according to terminal pins, SINR value is adjusted into SINR correction value, and according to SINR correction value, determine and to dispatch the Modulation and Coding Scheme MCS that descending sub frame that this subframe group to this terminal comprises is used when transmitting downlink data next time.
2. the method for claim 1, is characterized in that, according to described each ACK/NACK message, SINR value is adjusted into SINR correction value, specifically comprises:
Determine ACK message and NACK message in described each ACK/NACK message;
SINR value is added to each definite ACK message sub-side-play amount of correspondence respectively, and deduct each definite NACK message sub-side-play amount of correspondence respectively, obtain SINR correction value.
3. the method for claim 1, is characterized in that, the value of described CQI is that the SINR value that terminal measures descending sub frame is shone upon the MCS grade indication obtaining.
4. an outer shroud link circuit self-adapting implement device, is characterized in that, comprising:
Subframe group division unit, for can be used for of comprising according to the descending sub frame of same subframe group, transmit the number of orthogonal frequency division multiplex OFDM symbol of data in same predetermined quantity scope, belong to the mutually different division principle of the residing predetermined quantity scope of described number that the descending sub frame of different subframe groups comprises, the descending sub frame comprising in radio frames is divided and obtained a plurality of subframe groups;
Channel quality indication obtains unit, channel quality indicator (CQI) descending sub frame being measured for obtaining terminal;
Signal interference ratio value determining unit, determines signal interference ratio SINR value for the CQI obtaining according to channel quality indication acquisition unit;
Signal interference ratio value adjustment unit, for divide each the subframe group obtaining for subframe group division unit, each ACK/NACK message of the descending sub frame feedback that execution comprises this subframe group according to terminal pins, the SINR value that signal interference ratio value determining unit is definite is adjusted into SINR correction value;
Modulation and Coding Scheme determining unit, for the SINR correction value obtaining according to signal interference ratio value adjustment unit, determines and to dispatch the Modulation and Coding Scheme MCS that descending sub frame that this subframe group to this terminal comprises is used when transmitting downlink data next time.
5. device as claimed in claim 4, is characterized in that, described signal interference ratio value adjustment unit specifically comprises:
Determination module, for determining ACK message and the NACK message of described each ACK/NACK message;
Signal interference ratio value obtains module, for SINR value being added to each definite ACK message of determination module side-play amount of correspondence respectively, and deducts each definite NACK message of determination module side-play amount of correspondence respectively, obtains SINR correction value.
6. device as claimed in claim 4, is characterized in that, the value of described CQI is that the SINR value that terminal measures descending sub frame is shone upon the MCS grade indication obtaining.
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| CN103891186B (en) * | 2012-12-21 | 2017-01-25 | 华为技术有限公司 | Method and device for acquiring channel quality indicator value |
| US9729270B2 (en) | 2013-03-12 | 2017-08-08 | 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 |
| CN104518842B (en) * | 2013-09-27 | 2018-06-22 | 普天信息技术研究院有限公司 | A kind of method of adaptive adjustment modulation coding scheme |
| CN104936301B (en) * | 2014-03-21 | 2019-04-26 | 普天信息技术有限公司 | A kind of downlink frequency selection scheduling method |
| US20160105896A1 (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 |
| EP3557793B1 (en) * | 2017-01-25 | 2020-12-02 | Huawei Technologies Co., Ltd. | Outer loop link adaptation adjustment method and apparatus |
| US10574422B2 (en) * | 2017-06-30 | 2020-02-25 | Qualcomm Incorporated | Rate control adaptation |
| US11637643B2 (en) | 2018-09-28 | 2023-04-25 | Intel Corporation | Machine learning-based link adaptation |
| CN112640343A (en) * | 2020-04-27 | 2021-04-09 | 深圳市大疆创新科技有限公司 | MCS (modulation and coding scheme) adjusting method and device for sending end, unmanned aerial vehicle and storage medium |
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