CN110708149A - Method and device for determining downlink MCS - Google Patents
Method and device for determining downlink MCS Download PDFInfo
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- CN110708149A CN110708149A CN201810749348.9A CN201810749348A CN110708149A CN 110708149 A CN110708149 A CN 110708149A CN 201810749348 A CN201810749348 A CN 201810749348A CN 110708149 A CN110708149 A CN 110708149A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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Abstract
The application provides a method and a device for determining a downlink MCS, wherein the method comprises the following steps: aiming at users accessing a cell, distributing corresponding coverage levels for the users according to the distribution condition of the users; for any user, if the number of NACK (negative acknowledgement) fed back by the user is determined to be larger than a first preset threshold in a preset statistical window, adjusting a Channel Quality Indicator (CQI) of the user downwards by a first preset step length; if the number of the ACKs fed back by the user is determined to be larger than a second preset threshold, adjusting the CQI of the user upwards by a second preset step length; if the CQI of the user is determined to be adjusted, the adjusted CQI is used for determining the corresponding downlink MCS; the values of the preset statistical window, the first preset threshold, the second preset threshold, the first preset step length and the second preset step length are configured according to the coverage grade. The method can improve the transmission accuracy, the user throughput and the transmission efficiency of the user.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a downlink MCS.
Background
An important characteristic of a wireless channel is that the wireless channel has strong time-varying property, fading can reach dozens of or even dozens of dB in a short time, and the transmission efficiency of a communication system can be greatly improved by an Adaptive Modulation and Coding (AMC) technology aiming at the time-varying property of the channel.
The basic principle is that a channel for data transmission is estimated at a receiving end and fed back to a transmitting end, so that the transmitting end can select a corresponding Modulation and Coding Scheme (MCS) to perform data transmission according to the characteristics of the channel, and the overall throughput and transmission efficiency of the system are improved.
The downlink MCS selection method is to measure and report a Channel Quality Indicator (CQI) according to a CQI reporting mechanism, convert a reported value of the CQI into a corresponding Signal to Interference plus Noise Ratio (SINR) according to a CQI mapping table, and select a downlink MCS according to the SINR.
The downlink MCS determination is to determine the MCS based on the reported result of the CQI, and once the CQI estimation is inaccurate, the determined MCS is inaccurate.
Since users are distributed at different positions of a cell, the deviation degrees of CQI estimation results of different users are different, and if the CQI is adjusted according to a uniform method, the selected MCS may also be inaccurate. This not only affects the transmission efficiency of the user, but also affects the throughput of the cell as a whole.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for determining a downlink MCS, which can improve transmission accuracy, user throughput, and transmission efficiency of a user.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a method for determining a downlink Modulation and Coding Strategy (MCS) comprises the following steps:
aiming at users accessing a cell, distributing corresponding coverage levels for the users according to the distribution condition of the users;
counting feedback results of Negative Acknowledgement (NACK) and Acknowledgement (ACK) of any user in a preset counting window;
if the NACK number fed back by the user is determined to be larger than a first preset threshold, adjusting the Channel Quality Indicator (CQI) of the user downwards by a first preset step length;
if the number of the ACKs fed back by the user is determined to be larger than a second preset threshold, adjusting the CQI of the user upwards by a second preset step length;
if the CQI of the user is determined to be adjusted, the adjusted CQI is used for determining the corresponding downlink MCS;
the values of the preset statistical window, the first preset threshold, the second preset threshold, the first preset step length and the second preset step length are configured according to the coverage grade.
Wherein the content of the first and second substances,
the distribution of users includes a near point distribution, a middle point distribution and a far point distribution.
Wherein the content of the first and second substances,
the distribution situation of the users is determined according to the value of reference signal received power RSRP or signal-to-interference-plus-noise ratio SINR.
Wherein the content of the first and second substances,
if the number of NACKs fed back by the user is determined to be greater than the first preset threshold, the method further includes: determining whether the CQI of the user reaches the minimum CQI value, and if so, not adjusting the CQI of the user; otherwise, adjusting the channel quality indicator CQI of the user downwards by a first preset step length;
if the number of the ACKs fed back by the user is determined to be larger than the second preset threshold, the method further comprises: determining whether the CQI of the user reaches the maximum CQI value, and if so, not adjusting the CQI of the user; otherwise, adjusting the CQI of the user upwards by a second preset step length.
A downlink Modulation and Coding Strategy (MCS) determination device, comprising: the device comprises a distribution unit, a statistical unit, an adjusting unit and a determining unit;
the distribution unit is used for distributing corresponding coverage grades for users accessing the cell according to the distribution condition of the users; configuring a preset statistical window, a first preset threshold, a second preset threshold, a first preset step length and a second preset step length according to the coverage grade;
the statistical unit is used for counting the feedback results of the Negative Acknowledgement (NACK) and the Acknowledgement (ACK) of any user in a preset statistical window configured by the allocation unit;
the adjusting unit is configured to adjust the channel quality indicator CQI of the user downward by a first preset step length configured by the allocating unit if the counting unit determines that the number of NACKs fed back by the user is greater than a first preset threshold configured by the allocating unit; if the number of the ACKs fed back by the user is determined to be larger than a second preset threshold configured by the allocation unit, the CQI of the user is adjusted upwards by a second preset step length configured by the allocation unit;
and the determining unit is configured to determine the corresponding downlink MCS by using the adjusted CQI if it is determined that the CQI of the user is adjusted by the adjusting unit.
Wherein the content of the first and second substances,
the distribution of users includes a near point distribution, a middle point distribution and a far point distribution.
Wherein the content of the first and second substances,
the distribution situation of the users is determined according to the value of reference signal received power RSRP or signal-to-interference-plus-noise ratio SINR.
Wherein the content of the first and second substances,
the adjusting unit is further configured to determine whether the CQI of the user has reached the minimum CQI value if it is determined that the number of NACKs fed back by the user is greater than a first preset threshold, and if so, not adjust the CQI of the user; otherwise, adjusting the channel quality indicator CQI of the user downwards by a first preset step length; if the number of the ACKs fed back by the user is larger than a second preset threshold, determining whether the CQI of the user reaches the maximum value of the CQI, and if so, not adjusting the CQI of the user; otherwise, adjusting the CQI of the user upwards by a second preset step length.
According to the technical scheme, the factors of different CQI deviations reported by users with different coverage levels are considered, whether the CQI is adjusted or not is determined according to the user levels with different coverage levels by taking the number of Negative Acknowledgements (NACK) and Acknowledgements (ACK) fed back by the users with different coverage levels and a preset statistical window as a period, and if the CQI is adjusted for any user, the adjusted CQI is used for determining the downlink MCS. The scheme can improve the transmission accuracy, the user throughput and the transmission efficiency of the user.
Drawings
Fig. 1 is a schematic flow chart illustrating determining a downlink MCS in an embodiment of the present application;
fig. 2 is a schematic structural diagram of the device applied to the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides a method for determining a downlink MCS, which considers factors of different CQI deviations reported by users with different coverage levels, determines whether to adjust CQI according to the number of Negative Acknowledgements (NACK) and Acknowledgements (ACK) fed back by the users with different coverage levels by taking a preset statistical window as a period, and determines the downlink MCS by using the adjusted CQI if the CQI is adjusted for any user. The scheme can improve the transmission accuracy, the user throughput and the transmission efficiency of the user.
In the embodiment of the application, for a user accessing a cell, a corresponding coverage level is allocated to the user according to the distribution condition of the user.
The distribution of users may include, but is not limited to, a near point distribution, a middle point distribution, and a far point distribution. In particular the distance of the user from the base station. Three corresponding levels may be, but are not limited to, according to user distribution: corresponding to the near points, the middle points and the far points are distributed in a same grade; the farther away from the base station the greater the level of coverage.
And the values of the preset statistical window, the first preset threshold, the second preset threshold, the first preset step length and the second preset step length are configured according to the coverage grade.
In an actual application environment, the more distant the base station is, the more inaccurate the reported or measured CQI is, at this time, a smaller preset statistical window and a smaller first preset threshold, and a smaller second preset threshold, a smaller first preset step length and a smaller second preset step length need to be set for the coverage level. That is, the larger the coverage level is, the smaller the values of the preset statistical window and the first preset threshold are set, and the smaller the values of the second preset threshold, the first preset step length and the second preset step length are set.
The distribution of users is determined according to the value of Reference Signal Receiving Power (RSRP) or Signal to Interference plus Noise Ratio (SINR).
The RSRP is one of key parameters that may represent the radio signal strength in the LTE network and a physical layer measurement requirement, and is an average value of signal powers received on all Resource Elements (REs) that carry reference signals within a certain symbol, and the value may be obtained according to the existing implementation, which is not limited in this embodiment of the present application.
SINR refers to the ratio of the strength of the received desired signal to the strength of the received interfering signals (noise and interference); which may be simply understood as "signal-to-noise ratio", the value may be obtained according to the existing implementation, and this is not limited in the embodiment of the present application.
The following describes in detail a process of determining a downlink MCS in an embodiment of the present application with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic flowchart of determining a downlink MCS in the embodiment of the present application. The method comprises the following specific steps:
The preset statistical window in this step is configured according to the coverage level corresponding to the user, and different values can be set for different coverage levels.
If the NACK number fed back by the user is determined to be greater than the first preset threshold in this step, the method further includes: determining whether the CQI of the user reaches the minimum CQI value, and if so, not adjusting the CQI of the user; otherwise, adjusting the channel quality indicator CQI of the user downwards by a first preset step length.
If the current CQI of the user reaches the minimum value, even if the NACK number fed back by the user is larger than a first preset threshold, the CQI of the user is not adjusted downwards.
If the number of the ACKs fed back by the user is determined to be greater than the second preset threshold in this step, the method further comprises the following steps: determining whether the CQI of the user reaches the maximum CQI value, and if so, not adjusting the CQI of the user; otherwise, adjusting the CQI of the user upwards by a second preset step length.
The first preset threshold may be a product of a down-regulation threshold value CQI _ down _ th and a preset statistical window; the second preset threshold may be a product of the upper threshold CQI _ up _ th and the preset statistical window.
The first preset threshold and the second preset threshold may be the same or different.
The first preset step length, i.e. the downward adjustment step length CQI _ down _ N, and the second preset step length, i.e. the second adjustment step length CQI _ up _ N, may be the same or different.
In the embodiment of the present application, step 102 and step 103 may not be in sequence or may not necessarily occur, and whether the occurrence is determined according to specific situations.
One of the steps may be performed, neither of the steps may be performed, or both steps may be performed.
And step 104, if the base station determines that the CQI of the user is adjusted in the current preset statistical window, the base station determines the corresponding downlink MCS by using the adjusted CQI.
And if the base station determines that the CQI of the user is not adjusted in the current preset statistical window, the base station does not determine the downlink MCS again.
And the downlink UE is mapped to CQI according to the measured CRS SINR and reported to a base station (eNB).
And the uplink eNB acquires the uplink CQI through DMRS or SRS measurement.
And for the CQI (full band or sub-band) or the uplink CQI reported by the UE, the eNB determines the SINR according to the CQI mapping table and then determines the downlink MCS according to the SINR.
The eNB issues the determined MCS to the UE through the PDCCH, the UE can obtain a modulation mode and a TBS according to the MCS by looking up a table and perform downlink modulation or uplink modulation, and the eNB correspondingly performs downlink modulation and uplink modulation according to the MCS.
The improvement in the embodiment of the application is that the CQI reported by the UE or measured by the base station is adjusted, the MCS is determined after the adjustment, and if the CQI is determined to be adjusted in any preset statistical window, that is, the MCS is changed, the CQI is sent to the UE again through the PDCCH.
In the specific implementation of the present application, different coverage levels may be allocated to one user at different time periods, and a preset statistical window, an adjustment step size, and a preset threshold configured for the corresponding coverage level are used for different coverage levels to adjust the CQI.
In a specific implementation, the downlink MCS is determined for each user by using the above method. In specific implementation, the method provided by the present application is always used for adjusting the CQI after the user accesses, and the CQI can be adjusted through one statistical window during specific adjustment.
And after the counting adjustment of the current preset counting window is finished, the preset counting window is backwards slid, the number of NACK and ACK is continuously counted in the slid preset counting window to determine whether to adjust CQI, and when the number of NACK and ACK is counted in a new counting window, the number of NACK and ACK counted in the previous preset counting window needs to be reset.
Based on the same inventive concept, the application also provides a downlink MCS determining device. Referring to fig. 2, fig. 2 is a schematic structural diagram of the device applied to the embodiment of the present application. The device includes: an allocation unit 201, a statistic unit 202, an adjustment unit 203, and a determination unit 204;
an allocating unit 201, configured to allocate, for a user accessing a cell, a corresponding coverage level to the user according to a distribution condition of the user; configuring a preset statistical window, a first preset threshold, a second preset threshold, a first preset step length and a second preset step length according to the coverage grade;
a counting unit 202, configured to count, for any user, feedback results of negative acknowledgments NACK and acknowledgement ACK of the user in a preset counting window configured by the allocating unit 201;
an adjusting unit 203, configured to adjust the channel quality indicator CQI of the user downward by a first preset step length configured by the allocating unit 201 if the counting unit 202 determines that the number of NACKs fed back by the user is greater than a first preset threshold configured by the allocating unit 201; if the number of the ACKs fed back by the user is determined to be greater than a second preset threshold configured by the allocating unit 201, the CQI of the user is adjusted upward by a second preset step configured by the allocating unit 201;
determining unit 204, configured to determine the corresponding downlink MCS using the adjusted CQI if it is determined that adjusting unit 203 adjusts the CQI of the user.
Preferably, the first and second liquid crystal films are made of a polymer,
the distribution of users includes a near point distribution, a middle point distribution and a far point distribution.
Preferably, the first and second liquid crystal films are made of a polymer,
the distribution situation of the users is determined according to the value of reference signal received power RSRP or signal-to-interference-plus-noise ratio SINR.
Preferably, the first and second liquid crystal films are made of a polymer,
an adjusting unit 203, configured to determine whether the CQI of the user has reached the minimum CQI value if it is determined that the number of NACKs fed back by the user is greater than the first preset threshold, and if so, not adjust the CQI of the user; otherwise, adjusting the channel quality indicator CQI of the user downwards by a first preset step length; if the number of the ACKs fed back by the user is larger than a second preset threshold, determining whether the CQI of the user reaches the maximum value of the CQI, and if so, not adjusting the CQI of the user; otherwise, adjusting the CQI of the user upwards by a second preset step length.
The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or further divided into a plurality of sub-units.
In summary, the present application determines whether to adjust CQI according to the number of Negative Acknowledgements (NACKs) and Acknowledgements (ACKs) fed back by users with different coverage levels by considering different CQI deviations reported by the users with different coverage levels with a preset statistical window as a period, and determines a downlink MCS using the adjusted CQI if the CQI is adjusted for any user. The scheme can improve the transmission accuracy, the user throughput and the transmission efficiency of the user.
The method specifically comprises the following steps:
the coverage grades of different users in the cell are distinguished;
different CQI adjustment strategies are adopted according to different coverage levels of users;
the transmission accuracy of the users with the coverage grade difference (the users far away from the base station) is improved;
and the transmission throughput of the user with good coverage level (the user close to the base station) is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for determining a downlink Modulation and Coding Strategy (MCS) is characterized by comprising the following steps:
aiming at users accessing a cell, distributing corresponding coverage levels for the users according to the distribution condition of the users;
counting feedback results of Negative Acknowledgement (NACK) and Acknowledgement (ACK) of any user in a preset counting window;
if the NACK number fed back by the user is determined to be larger than a first preset threshold, adjusting the Channel Quality Indicator (CQI) of the user downwards by a first preset step length;
if the number of the ACKs fed back by the user is determined to be larger than a second preset threshold, adjusting the CQI of the user upwards by a second preset step length;
if the CQI of the user is determined to be adjusted, the adjusted CQI is used for determining the corresponding downlink MCS;
the values of the preset statistical window, the first preset threshold, the second preset threshold, the first preset step length and the second preset step length are configured according to the coverage grade.
2. The method of claim 1, wherein the distribution of users comprises a near point distribution, a middle point distribution, and a far point distribution.
3. The method of claim 1,
the distribution situation of the users is determined according to the value of reference signal received power RSRP or signal-to-interference-plus-noise ratio SINR.
4. The method according to any one of claims 1 to 3,
if the number of NACKs fed back by the user is determined to be greater than the first preset threshold, the method further includes: determining whether the CQI of the user reaches the minimum CQI value, and if so, not adjusting the CQI of the user; otherwise, adjusting the channel quality indicator CQI of the user downwards by a first preset step length;
if the number of the ACKs fed back by the user is determined to be larger than the second preset threshold, the method further comprises: determining whether the CQI of the user reaches the maximum CQI value, and if so, not adjusting the CQI of the user; otherwise, adjusting the CQI of the user upwards by a second preset step length.
5. A downlink Modulation and Coding Scheme (MCS) determining apparatus, comprising: the device comprises a distribution unit, a statistical unit, an adjusting unit and a determining unit;
the distribution unit is used for distributing corresponding coverage grades for users accessing the cell according to the distribution condition of the users; configuring a preset statistical window, a first preset threshold, a second preset threshold, a first preset step length and a second preset step length according to the coverage grade;
the statistical unit is used for counting the feedback results of the Negative Acknowledgement (NACK) and the Acknowledgement (ACK) of any user in a preset statistical window configured by the allocation unit;
the adjusting unit is configured to adjust the channel quality indicator CQI of the user downward by a first preset step length configured by the allocating unit if the counting unit determines that the number of NACKs fed back by the user is greater than a first preset threshold configured by the allocating unit; if the number of the ACKs fed back by the user is determined to be larger than a second preset threshold configured by the allocation unit, the CQI of the user is adjusted upwards by a second preset step length configured by the allocation unit;
and the determining unit is configured to determine the corresponding downlink MCS by using the adjusted CQI if it is determined that the CQI of the user is adjusted by the adjusting unit.
6. The apparatus of claim 5, wherein the distribution of users comprises a near point distribution, a middle point distribution, and a far point distribution.
7. The apparatus of claim 5,
the distribution situation of the users is determined according to the value of reference signal received power RSRP or signal-to-interference-plus-noise ratio SINR.
8. The apparatus according to any one of claims 4 to 7,
the adjusting unit is further configured to determine whether the CQI of the user has reached the minimum CQI value if it is determined that the number of NACKs fed back by the user is greater than a first preset threshold, and if so, not adjust the CQI of the user; otherwise, adjusting the channel quality indicator CQI of the user downwards by a first preset step length; if the number of the ACKs fed back by the user is larger than a second preset threshold, determining whether the CQI of the user reaches the maximum value of the CQI, and if so, not adjusting the CQI of the user; otherwise, adjusting the CQI of the user upwards by a second preset step length.
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| CN113922925A (en) * | 2021-10-09 | 2022-01-11 | 中国联合网络通信集团有限公司 | Processing method, base station and storage medium for data transmission modulation grade |
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