CN106105360B

CN106105360B - The selection method of modulation coding scheme and base station

Info

Publication number: CN106105360B
Application number: CN201580001917.6A
Authority: CN
Inventors: 丁承; 彭炳光
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-01-27
Filing date: 2015-01-27
Publication date: 2019-05-07
Anticipated expiration: 2035-01-27
Also published as: WO2016119128A1; CN106105360A

Abstract

The present embodiments relate to the selection method of modulation coding scheme and base stations, it is averaged difference value this method comprises: obtaining the Signal to Interference plus Noise Ratio SINR average value of user equipment (UE) and SINR in measurement period, the measurement period include current transmission time interval TTI before N number of TTI, N > 1；The Initial Block Error Rate IBLER target value of the UE is determined according to the SINR average value and the SINR difference value that is averaged；Obtain the IBLER measured value of UE described in the current TTI；The SINR filter value that the UE is adjusted according to the IBLER measured value and the IBLER target value, obtains the SINR end value of the UE；According to the SINR end value, modulation coding scheme MCS is selected for the UE.Therefore in the embodiment of the present invention, determining IBLER target value is able to reflect out actual channel quality fluctuation situation through the above way, and the MCS selected by this method can promote the spectrum efficiency of UE, to promote the throughput of UE.

Description

Method for selecting modulation coding mode and base station

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a method for selecting a modulation and coding scheme and a base station.

Background

In a wireless mobile communication system, a wireless environment changes sharply with time and space, and thus, in the case where transmission signals are the same, received signals may be attenuated to different degrees. In a Long Term Evolution (LTE) system, Adaptive Modulation and Coding (AMC) is used to obtain stable system performance.

In the prior art, an Initial Block Error Rate (IBLER) target value in a selection method of a Modulation and Coding Scheme (MCS) cannot reflect real-time change of a channel in an actual system, and a User Equipment (UE) cannot achieve a high data throughput Rate by using the existing selection method of the MCS.

Disclosure of Invention

The embodiment of the invention provides a method for selecting a modulation and coding mode and a base station, which can effectively improve the data throughput rate of UE.

In a first aspect, a method for selecting a modulation and coding scheme is provided, where the method includes:

acquiring a Signal to Interference plus noise Ratio (SINR) average value and an SINR average difference value of UE in a statistical period, wherein the statistical period comprises N TTIs before a current Transmission Time Interval (TTI), and N is greater than 1;

determining an IBLER target value of the UE according to the SINR average value and the SINR average difference value;

obtaining an IBLER measurement value of the UE in the current TTI;

adjusting the SINR filtering value of the UE according to the IBLER measuring value and the IBLER target value to obtain the final SINR value of the UE;

and selecting MCS for the UE according to the final SINR value.

In a second aspect, a base station is provided, which includes:

an obtaining unit, configured to obtain an SINR average value and an SINR average difference value of a UE in a statistical period, where the statistical period includes N TTIs before a current TTI, and N is greater than 1;

a determining unit, configured to determine an IBLER target value of the UE according to the SINR average value and the SINR average difference value acquired by the acquiring unit;

the obtaining unit is further configured to obtain an IBLER measurement value of the UE in the current TTI;

an adjusting unit, configured to adjust the SINR filtered value of the UE according to the IBLER measured value obtained by the obtaining unit and the IBLER target value determined by the determining unit, so as to obtain an SINR final value of the UE;

and the selecting unit is used for selecting the MCS for the UE according to the final SINR value acquired by the adjusting unit.

In a third aspect, a base station is provided, which includes:

a memory;

a processor;

the memory for storing instructions or code;

the processor is used for calling the instructions or codes stored in the memory and executing the following processing:

acquiring an SINR average value and an SINR average difference value of UE in a statistical period, wherein the statistical period comprises N TTIs before the current TTI, and N is greater than 1;

obtaining an IBLER measurement value of the UE in the current TTI;

and selecting MCS for the UE according to the final SINR value.

The embodiment of the invention provides a method for selecting MCS, which comprises the steps of determining an IBLER target value of UE according to an SINR average value and an SINR average difference value, adjusting an SINR filtering value of the UE according to the IBLER measuring value and the IBLER target value to obtain an SINR final value of the UE, and selecting the MCS for the UE according to the SINR final value. Because the SINR average value and the SINR average difference value can reflect the actual fluctuation condition of the channel quality, the method can improve the spectrum efficiency of the UE and further improve the throughput rate of the UE compared with the MCS selection method of the fixed IBLER target value.

Drawings

FIG. 1 is a block diagram of a wireless communication network;

fig. 2 is a flowchart of a method for selecting a modulation and coding scheme according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a method for determining an IBLER target value according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another method for determining an IBLER target value according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a base station according to a second embodiment of the present invention;

fig. 6 is a schematic structural diagram of another base station according to a third embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic diagram of a wireless communication network, such as the wireless communication network 100 shown in fig. 1, in which the wireless communication network 100 includes a plurality of base stations 110 and other network entities for supporting a plurality of user equipments 120 for communication. For convenience of description, the LTE network is taken as an example for illustration.

The base station 110 may be an evolved NodeB (eNB) in LTE. A base station 110 may support/manage one or more cells, and when a UE120 needs to communicate with the network, it will select one cell to initiate access.

The UE120 may also be referred to as a Mobile Terminal (MT), a Mobile Station (MS), etc., and may communicate with one or more core networks via a Radio Access Network (RAN).

The core network device 130 is connected to one or more base stations 110, and the core network device 130 includes a Mobility Management Entity (MME).

Fig. 2 is a flowchart of a method for selecting a modulation and coding scheme according to an embodiment of the present invention, where an execution subject of the method is a base station, and referring to fig. 2, the method includes:

step 201, a Signal to interference plus Noise Ratio (SINR) average value and an SINR average difference value of the UE in the statistical period are obtained.

The statistic period includes N TTIs before a current Transmission Time Interval (TTI), where N > 1.

The base station may obtain the SINR measurement value of the UE in each TTI of the N TTIs, and obtain the average SINR value and the average SINR difference value of the UE in the statistical period according to the N SINR measurement values.

Step 202, determining an IBLER target value of the UE according to the SINR average value and the SINR average difference value.

Optionally, for more accurate MCS selection, the moving speed of the UE may be considered when determining the IBLER target value, that is, the IBLER target value of the UE is determined according to the moving speed of the UE, the SINR average value of the UE, and the SINR average difference value of the UE.

Step 203, obtain the IBLER measurement value of the UE in the current TTI.

The ratio of the number of times that the first transmitted data is not correctly received and returned to non-Acknowledgement (NACK) indication information to the number of times that the data is first transmitted is referred to as an IBLER measurement value.

And 204, adjusting the SINR filtered value of the UE according to the IBLER measured value and the IBLER target value, and acquiring the final SINR value of the UE.

The method for acquiring the SINR filtering value of the UE comprises the following steps:

the filtered value of the SINR of the current scheduling TTI is the filtered value of the SINR of the previous scheduling TTI (1-a) + the measured value of the SINR of the current TTI a, a is configurable, and 0 < a < 1.

Step 205, selecting the MCS for the UE according to the final value of SINR.

The following describes a method for selecting a modulation and coding scheme according to the first embodiment of the present invention in detail.

The SINR measurement value can be obtained by two ways of direct measurement or indirect measurement: when a direct measurement mode is adopted, a base station acquires an SINR (Signal to interference Reference Signal) measurement value of UE (user equipment) by measuring a channel Sounding Reference Signal (SRS) or a Demodulation Reference Signal (DMRS) sent by the UE to the base station; when an indirect measurement mode is adopted, the base station estimates the SINR measurement value of the UE according to a Power Headroom Report (PHR) reported by the UE and the uplink Reference Signal Received Power (RSRP) of the UE.

The SINR average is the sum of the N SINR measurements divided by N. For example, for N-2, the SINR average is (SINR1+ SINR2)/2, where SINR1 is the SINR measurement for TTI1, and SINR2 is the SINR measurement for TTI 2.

The SINR average difference value is the absolute value of the difference between the SINR measurements of the UEs of adjacent TTIs, and then the average value is obtained. For example, for N2, SINR average difference value | SINR1-SINR2|, where SINR1 is the SINR measurement for TTI1, SINR2 is the SINR measurement for TTI 2; for N-3, the SINR average difference value (| SINR2-SINR1| + | SINR3-SINR2|)/2, where SINR1 is the SINR measurement for TTI1, SINR2 is the SINR measurement for TTI2, and SINR3 is the SINR measurement for TTI 3.

The base station may obtain an SINR measurement value of the UE in each TTI of N TTIs of the UE in the statistical period, and obtain an SINR average value and an SINR average difference value of the UE in the statistical period according to the N SINR measurement values. The statistical period includes N TTIs before the current TTI, where N > 1.

And determining the IBLER target value of the UE by the base station according to the SINR average value and the SINR average difference value.

In the embodiment of the present invention, the IBLER target value of the UE may be determined by combining the SINR average value and the SINR average difference value, or may be determined by one of the SINR average value and the SINR average difference value.

Fig. 3 is a schematic diagram of a method for determining an IBLER target value in an embodiment of the present invention, where the method determines the IBLER target value of the UE by combining an SINR average value and an SINR average difference value, and referring to fig. 3, the specific determination method includes:

when the SINR average difference value is greater than the SINR fluctuation upper threshold, the first target value is determined to be an IBLER target value of the UE, or when the SINR average difference value is less than the SINR fluctuation upper threshold, the second target value is determined to be an IBLER target value of the UE, the first target value is greater than the second target value, for example, the first target value may be 30%, and the second target value may be 10%. In the embodiment of the present invention, the IBLER target value may be set as the second target value in advance.

In the embodiment of the invention, the IBLER target value of the UE is determined by combining the SINR average value and the SINR average difference value, so that the larger IBLER target value can be selected when the channel fluctuation is larger, and the smaller IBLER target value can be selected when the channel fluctuation is smaller. When a large IBLER target value is selected, the IBLER converges to a set target value because IBLER increases and therefore, IBLER increases and eventually stabilizes. After IBLER has risen, a higher order MCS may be selected. When a smaller IBLER target value is selected, the convergence value of IBLER decreases and thus IBLER decreases.

Because the IBLER target value configuration is sometimes larger and favorable for improving the uplink spectrum efficiency when the channel fluctuation conditions are different, and sometimes the IBLER target value configuration is sometimes smaller and favorable for improving the uplink spectrum efficiency, the IBLER target value is selected according to the actual channel fluctuation conditions, and the uplink spectrum efficiency of the UE can be improved.

The base station may determine the moving speed of the UE in various manners, for example, the base station may measure the doppler shift of the UE and determine the moving speed of the UE according to the doppler shift of the UE.

Fig. 4 is a schematic diagram of another method for determining an IBLER target value according to an embodiment of the present invention, in the method, the IBLER target value of the UE is determined according to the moving speed of the UE, the SINR average value of the UE, and the SINR average difference value of the UE, and referring to fig. 4, the specific determination method includes:

when the SINR average difference value is larger than the SINR fluctuation upper threshold, determining that a first target value is an IBLER target value of the UE; or, when the SINR average value is smaller than an average SINR lower threshold, the SINR average difference value is smaller than an SINR fluctuation upper threshold, and the moving speed is greater than a speed threshold, determining that the first target value is an IBLER target value of the UE; or, when the SINR average value is smaller than an average SINR lower threshold, the SINR average difference value is smaller than an SINR fluctuation upper threshold, and the moving speed is smaller than a speed threshold, determining that the second target value is the IBLER target value of the UE; or, when the SINR average value is greater than the average SINR lower threshold and less than the average SINR upper threshold and the SINR average difference value is less than the SINR fluctuation upper threshold, determining that the second target value is the IBLER target value of the UE; or, when the SINR average value is greater than the average SINR upper threshold and the SINR average difference value is greater than the SINR fluctuation lower threshold and less than the SINR fluctuation upper threshold, determining the second target value as the IBLER target value of the UE; or, when the SNR average value is greater than an average SINR upper threshold, the SINR average difference value is less than an SINR fluctuation lower threshold, and the moving speed is greater than a speed threshold, determining that the third target value is the IBLER target value of the UE; or, when the SINR average value is greater than the average SINR upper threshold, the SINR average difference value is less than the SINR fluctuation lower threshold, and the moving speed is less than the speed threshold, determining that the second target value is the IBLER target value of the UE, and the first target value is greater than the second target value and greater than the third target value.

In the embodiment of the present invention, an SINR fluctuation lower threshold, an SINR fluctuation upper threshold, an average SINR lower threshold, an average SINR upper threshold, and a speed threshold may be preset, for example, the speed threshold is set to 20 km/h; the first target value, the second target value, and the third target value may also be set in advance, and for example, the first target value may be 30%, the second target value may be 10%, and the third target value may be 5%. In the embodiment of the present invention, the IBLER target value may be set as the second target value in advance.

According to the processing procedure, under the high-speed condition, when the channel fluctuation is large, a large IBLER target value is selected; when the channel fluctuation is small, selecting a small IBLER target value at a near point according to the IBLER average value, selecting a large IBLER target value at a far point, and keeping the IBLER target value unchanged under the other conditions, wherein the near point refers to a position where the path loss between a user and a base station is small, and the small IBLER target value is selected to obtain better spectral efficiency. Under low speed conditions, when the channel fluctuation is large, a large IBLER target value is selected, and otherwise, the IBLER target value is not changed. When a large IBLER target value is selected, the IBLER converges to a set target value because IBLER increases and therefore, IBLER increases and eventually stabilizes. After IBLER has risen, a higher order MCS may be selected. When a smaller IBLER target value is selected, the convergence value of IBLER decreases and thus IBLER decreases.

And the base station acquires the IBLER measured value of the UE in the current TTI, adjusts the SINR filtered value of the UE according to the IBLER measured value and the IBLER target value, and acquires the final SINR value of the UE.

When the IBLER measured value is smaller than the IBLER target value, the SINR filtered value is adjusted up by a first adjustment amount to obtain the final SINR value of the UE; or,

and when the IBLER measured value is larger than the IBLER target value, adjusting the SINR filtered value downwards by a second adjustment amount to obtain the final SINR value of the UE.

Specifically, when the IBLER measurement value is smaller than the IBLER target value, the first adjustment amount is an adjustment step IBLER target value, and the SINR filtered value + the first adjustment amount is an SINR final value;

when the IBLER measurement value is greater than the IBLER target value, the second adjustment amount is the adjustment step size (1-IBLER target value), and the SINR filtered value — the second adjustment amount is the SINR final value; wherein the adjustment step size is configurable.

And the base station selects MCS for the UE according to the final SINR value.

And after the final value of the SINR is determined, the base station acquires the corresponding MCS according to the final value of the SINR. And the base station sends the selected MCS to the UE through a downlink control channel.

In the embodiment of the invention, the sequence of obtaining each parameter is not specifically limited, the SINR average value and the SINR average difference value of the UE in the statistical period can be obtained first, and then the IBLER measured value of the UE in the current TTI is obtained; or obtaining the IBLER measured value of the UE in the current TTI, and then obtaining the SINR average value and the SINR average difference value of the UE in the statistical period; and the SINR average value and the SINR average difference value of the UE in the statistical period and the IBLER measurement value of the UE in the current TTI can be obtained simultaneously.

Optionally, in the method for selecting a modulation and coding scheme, it may be further detected whether the UE is a Full load (Full Buffer) UE, where the Full Buffer UE is a UE that has a sufficient data volume and can obtain a scheduling opportunity each time. And when the detection result indicates that the UE is Full Buffer UE, executing other steps of the method.

Specifically, it may be detected whether the UE meets a first condition and a second condition, where the first condition is that a ratio of a resource required for transmission by the UE to a system bandwidth is greater than a first ratio threshold, and the second condition is that a ratio of a number of times that the UE obtains scheduling to a total number of times that the UE obtains scheduling to the total number of times that the UE obtains scheduling is greater than a second ratio threshold; and when the UE meets the first condition and the second condition, determining that the UE is a FullBuffer UE.

In the embodiment of the invention, whether the UE is Full Buffer UE or not is identified, and the selection method of the modulation coding mode is executed when the UE is identified to be the Full Buffer UE, so that the problem that the IBLER target value is changed to generate negative gain when the selection method of the modulation coding mode is executed when the UE is not the Full Buffer UE can be avoided.

The embodiment of the invention provides a method for selecting a modulation coding mode, which is characterized in that an IBLER target value of UE is determined according to an SINR average value and an SINR average difference value, or the IBLER target value of the UE is determined according to a moving speed, the SINR average value and the SINR average difference value, an SINR filtering value of the UE is adjusted according to an IBLER measuring value and the IBLER target value to obtain an SINR final value of the UE, and MCS is selected for the UE according to the SINR final value. Because a larger IBLER target value is selected when the channel fluctuation is larger, and a smaller IBLER target value is selected when the channel fluctuation is smaller, the spectrum efficiency of the UE can be improved compared with the MCS selection method of a fixed IBLER target value, and the throughput rate of the UE is further improved.

Fig. 5 is a schematic structural diagram of a base station according to a second embodiment of the present invention, where the base station is configured to execute the MCS selection method according to the first embodiment of the present invention, and referring to fig. 5, the base station includes:

an obtaining unit 501, configured to obtain an SINR average value and an SINR average difference value of a UE in a statistical period, where the statistical period includes N TTIs before a current TTI, and N is greater than 1;

the obtaining unit 501 may obtain SINR measurement values of the UE in each TTI of the N TTIs, and obtain an average SINR value and an average SINR difference value of the UE in the statistical period according to the N SINR measurement values.

The obtaining unit 501 may obtain the SINR measurement value through two ways of direct measurement or indirect measurement. Optionally, the base station further includes a transceiver unit, and when a direct measurement mode is adopted, the UE sends the SRS or the DMRS to the base station through the transceiver unit, and the obtaining unit 501 obtains an SINR measurement value of the UE by measuring the SRS or the DMRS; when an indirect measurement mode is adopted, the UE sends PHR and RSRP to the base station through the transceiver unit, and the obtaining unit 501 estimates an SINR measurement value of the UE according to the PHR and RSRP.

A determining unit 502, configured to determine an IBLER target value of the UE according to the SINR average value and the SINR average difference value acquired by the acquiring unit 501;

optionally, for more accurate MCS selection, the moving speed of the UE may also be considered when determining the IBLER target value, that is, the obtaining unit 501 is further configured to obtain the moving speed of the UE, and the determining unit 502 determines the IBLER target value of the UE according to the moving speed of the UE, the SINR average value of the UE, and the SINR average difference value of the UE.

An obtaining unit 501, configured to obtain an IBLER measurement value of the UE in the current TTI;

an adjusting unit 503, configured to adjust the SINR filtered value of the UE according to the IBLER measured value obtained by the obtaining unit 501 and the IBLER target value determined by the determining unit 502, so as to obtain a final SINR value of the UE;

a selecting unit 504, configured to select a modulation and coding scheme MCS for the UE according to the final SINR value obtained by the adjusting unit 503.

The embodiment of the invention provides a base station, wherein a determining unit 502 determines an IBLER target value of a UE according to an SINR average value and an SINR average difference value obtained by an obtaining unit 501, an adjusting unit 503 adjusts an SINR filtered value of the UE according to an IBLER measured value obtained by the obtaining unit 501 and the IBLER target value determined by the determining unit 502 to obtain an SINR final value of the UE, and a selecting unit 504 selects an MCS for the UE according to the SINR final value. Because the SINR average value and the SINR average difference value can reflect the actual fluctuation condition of the channel quality, compared with the MCS selection method adopting a fixed IBLER target value in other base stations, the method can improve the spectrum efficiency of the UE, and further improve the throughput rate of the UE.

Preferably, the determining unit 502 is specifically configured to:

when the SINR average difference value obtained by the obtaining unit 501 is greater than an SINR fluctuation upper threshold, determining that a first target value is an IBLER target value of the UE; or,

when the SINR average difference value obtained by the obtaining unit 501 is smaller than the SINR fluctuation upper threshold, determining that the second target value is the IBLER target value of the UE, where the first target value is larger than the second target value.

Preferably, the obtaining unit 501 is further configured to: acquiring the moving speed of the UE;

the determining unit 502 is specifically configured to: and determining an IBLER target value of the UE according to the moving speed, the SINR average value and the SINR average difference value.

Preferably, the determining unit 502 is specifically configured to:

when the SINR average difference value is larger than an SINR fluctuation upper threshold, determining a first target value as an IBLER target value of the UE; or,

when the SINR average value is smaller than an average SINR lower threshold, the SINR average difference value is smaller than an SINR fluctuation upper threshold, and the moving speed is larger than a speed threshold, determining that a first target value is an IBLER target value of the UE; or,

when the SINR average value is smaller than an average SINR lower threshold, the SINR average difference value is smaller than an SINR fluctuation upper threshold, and the moving speed is smaller than a speed threshold, determining that a second target value is an IBLER target value of the UE; or,

when the SINR average value is larger than the average SINR lower threshold and smaller than the average SINR upper threshold and the SINR average difference value is smaller than the SINR fluctuation upper threshold, determining that a second target value is the IBLER target value of the UE; or,

when the SINR average value is greater than the average SINR upper threshold and the SINR average difference value is greater than the SINR fluctuation lower threshold and less than the SINR fluctuation upper threshold, determining a second target value as the IBLER target value of the UE; or,

when the SNR average value is larger than an average SINR upper threshold, the SINR average difference value is smaller than an SINR fluctuation lower threshold, and the moving speed is larger than a speed threshold, determining that a third target value is an IBLER target value of the UE; or,

and when the SINR average value is greater than an average SINR upper threshold, the SINR average difference value is less than an SINR fluctuation lower threshold, and the moving speed is less than a speed threshold, determining that a second target value is an IBLER target value of the UE, wherein the first target value is greater than the second target value and greater than the third target value.

Preferably, the adjusting unit 503 is specifically configured to:

when the IBLER measurement value obtained by the obtaining unit 501 is smaller than the IBLER target value determined by the determining unit 502, the SINR filter value is adjusted up by a first adjustment amount to obtain a final SINR value of the UE; or,

when the IBLER measurement value obtained by the obtaining unit 501 is greater than the IBLER target value determined by the determining unit 502, the SINR filtering value is adjusted downward by a second adjustment amount to obtain a final SINR value of the UE.

Preferably, the obtaining unit 501 is specifically configured to: and when the UE is Full Buffer UE, acquiring the SINR average value and the SINR average difference value of the UE in the statistical period.

Preferably, the base station further includes:

a detecting unit, configured to detect whether the UE meets a first condition and a second condition, where the first condition is that a ratio of a resource required for transmission by the UE to a system bandwidth is greater than a first ratio threshold, and the second condition is that a ratio of a number of times that the UE obtains scheduling to a total number of times that the UE obtains scheduling is greater than a second ratio threshold; and when the UE meets the first condition and the second condition, determining that the UE is Full Buffer UE.

Fig. 6 is a schematic structural diagram of another base station according to a third embodiment of the present invention, where the base station is configured to execute the MCS selection method according to the first embodiment of the present invention, and referring to fig. 6, the base station includes:

a memory 601;

a processor 602;

the memory 601 is used for storing instructions or codes, and the processor 602 is used for calling the instructions or codes of the memory 601 and executing the following processes:

obtaining an IBLER measurement value of the UE in the current TTI;

and selecting MCS for the UE according to the final SINR value.

Preferably, the processor 602 may obtain SINR measurement values of the UE in each of the N TTIs, and obtain an average SINR value and an average SINR difference value of the UE in the statistical period according to the N SINR measurement values.

The processor 602 may obtain the SINR measurement value by direct measurement or indirect measurement. Optionally, the base station further includes a transceiver, when a direct measurement mode is adopted, the UE sends an SRS or DMRS to the base station through the transceiver, and the processor 602 obtains an SINR measurement value of the UE by measuring the SRS or DMRS; when the indirect measurement mode is adopted, the UE sends PHR and RSRP to the base station through the transceiver, and the processor 602 estimates an SINR measurement value of the UE according to the PHR and RSRP.

Preferably, the instructions or codes stored in the memory 601 operable to cause the processor 602 to execute the determining the IBLER target value of the UE according to the SINR average value and the SINR average difference value are:

and when the SINR average difference value is smaller than an upper threshold of SINR fluctuation, determining a second target value as an IBLER target value of the UE, wherein the first target value is larger than the second target value.

Preferably, the processor 602 is further configured to perform the following operations according to instructions or code stored in the memory 601:

acquiring the moving speed of the UE;

the instructions or code stored in memory 601 that are operable to cause processor 602 to perform the determining an IBLER target value for the UE from the SINR average and the SINR average difference values are:

and determining an IBLER target value of the UE according to the moving speed, the SINR average value and the SINR average difference value.

Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, and the program may be stored in a computer-readable storage medium, where the storage medium is a non-transitory medium, such as a random access memory, a read only memory, a flash memory, a hard disk, a solid state disk, a magnetic tape (magnetic tape), a floppy disk (floppy disk), an optical disk (optical disk), and any combination thereof.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for selecting a modulation coding scheme, the method comprising:

acquiring an average value of signal to interference plus noise ratio (SINR) and an average difference value of SINR of User Equipment (UE) in a statistical period, wherein the statistical period comprises N TTIs before a current Transmission Time Interval (TTI), and N is greater than 1;

determining an initial block error rate (IBLER) target value of the UE according to the SINR average value and the SINR average difference value;

obtaining an IBLER measurement value of the UE in the current TTI;

selecting a Modulation Coding Scheme (MCS) for the UE according to the final SINR value;

wherein the determining an IBLER target value of the UE according to the SINR average value and the SINR average difference value includes:

2. The method of claim 1, further comprising:

acquiring the moving speed of the UE;

the determining an IBLER target value of the UE according to the SINR average value and the SINR average difference value includes:

3. The method of claim 2, wherein the determining an IBLER target value for the UE according to the moving speed, the SINR average value, and the SINR average difference value comprises:

when the SINR average value is greater than an average SINR upper threshold, the SINR average difference value is less than an SINR fluctuation lower threshold, and the moving speed is greater than a speed threshold, determining that a third target value is an IBLER target value of the UE; or,

4. The method according to any of claims 1 to 3, wherein the adjusting the SINR filtered value of the UE according to the IBLER measured value and the IBLER target value to obtain the final SINR value of the UE comprises:

when the IBLER measured value is smaller than the IBLER target value, the SINR filtered value is adjusted upwards by a first adjustment amount to obtain a final SINR value of the UE; or,

and when the IBLER measured value is larger than the IBLER target value, adjusting the SINR filtered value downwards by a second adjustment amount to obtain a final SINR value of the UE.

5. The method according to any of claims 1 to 3, wherein the obtaining the SINR average value and the SINR average difference value of the UE in the statistical period comprises:

and when the UE is the full-load UE, acquiring the SINR average value and the SINR average difference value of the UE in the statistical period.

6. The method of claim 4, wherein the obtaining the SINR average value and the SINR average difference value of the UE in the statistical period comprises:

7. The method of claim 5, further comprising: detecting whether the UE meets a first condition and a second condition, wherein the first condition is that the ratio of resources required by the UE for transmission to system bandwidth is greater than a first ratio threshold, and the second condition is that the ratio of the scheduling times obtained by the UE to the total scheduling times is greater than a second ratio threshold;

when the UE meets the first condition and the second condition, confirming that the UE is a full load UE.

8. The method of claim 6, further comprising: detecting whether the UE meets a first condition and a second condition, wherein the first condition is that the ratio of resources required by the UE for transmission to system bandwidth is greater than a first ratio threshold, and the second condition is that the ratio of the scheduling times obtained by the UE to the total scheduling times is greater than a second ratio threshold;

9. A base station, characterized in that the base station comprises:

an obtaining unit, configured to obtain an average value and an average difference value of SINR (signal to interference plus noise ratio) of a signal to interference plus noise ratio) of User Equipment (UE) in a statistical period, where the statistical period includes N TTIs before a current transmission time interval TTI, and N > 1;

a determining unit, configured to determine an initial block error rate IBLER target value of the UE according to the SINR average value and the SINR average difference value obtained by the obtaining unit;

a selecting unit, configured to select a modulation and coding scheme MCS for the UE according to the final SINR value obtained by the adjusting unit;

wherein the determining unit is specifically configured to:

when the average difference value of the SINR acquired by the acquiring unit is greater than the upper threshold of the SINR fluctuation, determining that a first target value is an IBLER target value of the UE; or,

and when the average SINR difference value acquired by the acquiring unit is smaller than an upper SINR fluctuation threshold, determining a second target value as an IBLER target value of the UE, where the first target value is larger than the second target value.

10. The base station of claim 9, wherein the obtaining unit is further configured to: acquiring the moving speed of the UE;

the determining unit is specifically configured to: and determining an IBLER target value of the UE according to the moving speed, the SINR average value and the SINR average difference value.

11. The base station of claim 10, wherein the determining unit is specifically configured to:

12. The base station according to any of claims 9 to 11, wherein the adjusting unit is specifically configured to:

when the IBLER measured value obtained by the obtaining unit is smaller than the IBLER target value determined by the determining unit, the SINR filtered value is adjusted upwards by a first adjustment amount to obtain the final SINR value of the UE; or,

and when the IBLER measured value acquired by the acquisition unit is larger than the IBLER target value determined by the determination unit, adjusting the SINR filtered value downwards by a second adjustment amount to acquire the final SINR value of the UE.

13. The base station according to any of claims 9 to 11, wherein the obtaining unit is specifically configured to: and when the UE is the full-load UE, acquiring the SINR average value and the SINR average difference value of the UE in the statistical period.

14. The base station of claim 12, wherein the obtaining unit is specifically configured to: and when the UE is the full-load UE, acquiring the SINR average value and the SINR average difference value of the UE in the statistical period.

15. The base station of claim 13, wherein the base station further comprises:

a detecting unit, configured to detect whether the UE meets a first condition and a second condition, where the first condition is that a ratio of a resource required for transmission by the UE to a system bandwidth is greater than a first ratio threshold, and the second condition is that a ratio of a number of times that the UE obtains scheduling to a total number of times that the UE obtains scheduling is greater than a second ratio threshold; when the UE meets the first condition and the second condition, confirming that the UE is a full load UE.

16. The base station of claim 14, wherein the base station further comprises:

17. A base station, characterized in that the base station comprises:

a memory;

a processor;

the memory for storing instructions or code;

obtaining an IBLER measurement value of the UE in the current TTI;