CN109687937B - Modulation coding mode and repetition frequency selection method and device - Google Patents
Modulation coding mode and repetition frequency selection method and device Download PDFInfo
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Abstract
The embodiment of the invention discloses a modulation coding mode and repetition frequency selection method and device, which can realize the maximization of throughput on the basis of meeting the requirement of block error rate. S1, when the dispatching cycle of the user arrives, determining the NACK number according to the data in the maintained transmission result list of the user; s2, when judging and knowing that the NACK number is not less than the product of the configuration length of the transmission result list and a first numerical value, inquiring a TBS mapping table according to the current buffer storage amount of the user, the sub-band number determined by the user bandwidth capacity, the current MCS and the repetition frequency, determining the number of wireless frames NF required to be occupied by the transmission block size meeting the buffer storage requirement, and adjusting the MCS or the repetition frequency according to the NF; and S3, emptying the transmission result list.
Description
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a modulation coding mode and repetition frequency selection method and device.
Background
In a broadband access system based on the TD-LTE technology, the available bandwidth of the system is divided into a plurality of continuous or discontinuous sub-bands, and each sub-band is transmitted by adopting the Orthogonal Frequency Division Multiplexing (OFDM) technology. The sub-band is divided into a synchronous sub-band, a broadcast sub-band and a service sub-band according to functions. The synchronous sub-band is used for sending downlink synchronous signals, the broadcast sub-band is used for downlink broadcast and uplink random access, and the service sub-band is used for transmitting services. In order to reduce the cost of the terminal, the system supports a single subband operation mode, and each physical channel must be independently transmitted on each subband. The terminal works on all or part of sub-bands according to different selections of hardware capabilities, and the terminal with the weakest capability only works on a single sub-band. A typical application scenario is a wireless broadband access network of a power system, which is referred to as TD-LTE230 network for short, and the frequency spectrum of the wireless broadband access network is discretely distributed in a 230MHz frequency band, and each sub-band is 25 kHz.
The TD-LTE230 network requires to support deep coverage, and in order to improve the transmission performance of each physical channel, a repetitive transmission mode is adopted in the time domain, and a periodic transmission mode is adopted to obtain a time diversity gain. Therefore, the timing relationship of data transmission is as follows: in a PDCCH (Physical Downlink Control Channel, which is called Physical Uplink Shared Channel in all english) period, the PDCCH sends an Uplink grant information scheduling PUSCH (Physical Uplink Shared Channel in all english) and/or a Downlink grant information scheduling PDSCH (Physical Downlink Shared Channel in all english), and the PDCCH transmission time depends on the PDCCH maximum repetition number configured by an RRC (Radio Resource Control protocol, which is called Radio Resource Control) message and the PDCCH repetition number configured by Uplink grant and/or Downlink grant; after the last repeated transmission of the PDCCH is finished, the next radio frame starts to transmit the PUSCH and/or the PDSCH, the PUSCH transmission time depends on the number of the radio frames occupied by the transmission blocks configured by the uplink authorization and the number of repeated times, and the PDSCH transmission time depends on the number of the radio frames occupied by the transmission blocks configured by the downlink authorization and the number of repeated times; the feedback information of the uplink transmission block is indicated by NDI (New data Indicator, which is called New data Indicator in english) in the uplink authorization information of the next PDCCH period separated by one PDCCH period, and the feedback information of the downlink transmission block is carried by PUCCH which starts to be transmitted in the next radio frame after the last repeated transmission of PDSCH is finished, and the PUCCH occupies all uplink subframes of one radio frame.
The general principle of data transmission is to pursue a higher transmission rate on the basis of meeting the requirement of the block error rate. Generally, the block error rate of the PDSCH or PUSCH channel is required to be less than or equal to 10%, and a Modulation and Coding Scheme (MCS) of each level and an SINR (demodulation threshold) corresponding to 10% of the block error rate under each level of repetition times are given through link level simulation. The relation between the MCS and the repetition number and the demodulation threshold is that the higher the MCS is, the larger the demodulation threshold is required, and the larger the repetition number is, the smaller the demodulation threshold is required.
Therefore, the base station needs to select a suitable transmission parameter under the constraint condition, and send DCI (Downlink Control Information) carried by a PDCCH channel to the user.
In the prior art, on one hand, the MCS and/or the repetition times are selected according to the SINR measurement value, which is not suitable for the situation that the SINR measurement value is not reported or the reported SINR measurement value is not accurate; on the other hand, only MCS is adjusted according to the statistical results of ACK (Acknowledgement character, full english is called Acknowledgement) and NACK (Not Acknowledgement character, full english is called Not Acknowledgement), and how the two-dimensional factors of MCS and repetition number are adjusted is Not considered.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the embodiment of the invention provides a method and a device for selecting a modulation coding mode and a repetition frequency.
In one aspect, an embodiment of the present invention provides a method for selecting a modulation and coding scheme and a repetition number, including:
s1, when the scheduling period of the user arrives, determining the NACK number according to the data in the maintained transmission result list of the user, wherein, the ACK or NACK feedback result of the data packet of the user is received each time and added into the list, the ACK feedback result represents the successful transmission of the data packet, and the NACK feedback result represents the failure of the transmission of the data packet;
s2, when judging and knowing that the NACK number is not less than the product of the configuration length of the transmission result list and a first numerical value, inquiring a TBS mapping table according to the current buffer storage amount of the user, the sub-band number determined by the user bandwidth capacity, the current MCS and the repetition frequency, determining the number of wireless frames NF required to be occupied by the transmission block size meeting the buffer storage requirement, and adjusting the MCS or the repetition frequency according to the NF;
and S3, emptying the transmission result list.
Preferably, the adjusting the MCS or the number of repetitions according to the NF includes:
judging whether the repetition times reach the maximum value or not when judging that NF is equal to 1, wherein the maximum value is the result of taking the minimum value from the maximum value of the repetition times specified by a DCI format and the maximum value of the number of PDSCH or PUSCH wireless frames specified by the current PDCCH period;
if the repetition number does not reach the maximum value, increasing the repetition number by one step length; or
If the repetition times reaches the maximum value, further judging whether the MCS is the lowest-order MCS, and if the MCS is the lowest-order MCS, not adjusting the MCS; otherwise, the MCS is decreased by one step.
Preferably, the adjusting the MCS or the number of repetitions according to the NF includes:
judging whether the MCS is the lowest order MCS or not when judging that the NF is larger than 1;
if the MCS is not the lowest order MCS, reducing the MCS by one step; or
If the MCS is the lowest-order MCS, further judging whether the repetition frequency reaches the maximum value, and if the repetition frequency reaches the maximum value, not adjusting the repetition frequency; otherwise, increasing the repetition times by one step, wherein the maximum value is the minimum value of the maximum value of the repetition times specified by the DCI format and the maximum value of the number of the PDSCH or PUSCH radio frames specified by the current PDCCH period.
Preferably, the S2, further includes:
judging whether the number of times of repetition is equal to 1 or not when the NACK number is judged to be not more than the product of the configuration length of the transmission result list and a second numerical value and the sum of the ACK number and the NACK number in the transmission result list is equal to the configuration length of the transmission result list;
and adjusting the MCS and the repetition times according to the judgment result.
Preferably, the adjusting the MCS and the number of repetitions according to the determination result includes:
if the repetition times is equal to 1, further judging whether the MCS is the highest-order MCS, and if so, not adjusting the MCS; otherwise, increasing the MCS by one step; or
If the repetition number is greater than 1, reducing the repetition number by one step.
On the other hand, an embodiment of the present invention provides a modulation and coding scheme and repetition number selection apparatus, including:
the computing unit is used for determining the NACK number according to the data in the maintained transmission result list of the user when the scheduling period of the user arrives, wherein, the ACK feedback result or the NACK feedback result of the data packet of the user is received each time and added into the list, the ACK feedback result represents that the data packet is successfully transmitted, and the NACK feedback result represents that the data packet is failed to be transmitted;
an adjusting unit, configured to, when it is determined that the NACK number is not less than a product of the configuration length of the transmission result list and a first value, query a TBS mapping table according to a current buffer size of the user, a sub-band number determined by a user bandwidth capability, a current MCS, and a repetition number, determine a number of radio frames NF that needs to be occupied by a transport block size that meets a buffering requirement, and adjust the MCS or the repetition number according to the NF;
and the emptying unit is used for emptying the transmission result list.
Preferably, the adjusting unit is specifically configured to:
judging whether the repetition times reach the maximum value or not when judging that NF is equal to 1, wherein the maximum value is the result of taking the minimum value from the maximum value of the repetition times specified by a DCI format and the maximum value of the number of PDSCH or PUSCH wireless frames specified by the current PDCCH period;
if the repetition number does not reach the maximum value, increasing the repetition number by one step length; or
If the repetition times reaches the maximum value, further judging whether the MCS is the lowest-order MCS, and if the MCS is the lowest-order MCS, not adjusting the MCS; otherwise, the MCS is decreased by one step.
Preferably, the adjusting unit is specifically configured to:
judging whether the MCS is the lowest order MCS or not when judging that the NF is larger than 1;
if the MCS is not the lowest order MCS, reducing the MCS by one step; or
If the MCS is the lowest-order MCS, further judging whether the repetition frequency reaches the maximum value, and if the repetition frequency reaches the maximum value, not adjusting the repetition frequency; otherwise, increasing the repetition times by one step, wherein the maximum value is the minimum value of the maximum value of the repetition times specified by the DCI format and the maximum value of the number of the PDSCH or PUSCH radio frames specified by the current PDCCH period.
Preferably, the adjusting unit further includes:
a determining subunit, configured to determine whether the number of times of repetition is equal to 1 when it is determined that the NACK number is not greater than a product of the configuration length of the transmission result list and a second value, and a sum of the ACK and the NACK number in the transmission result list is equal to the configuration length of the transmission result list;
and the adjusting subunit is used for adjusting the MCS and the repetition times according to the judgment result.
Preferably, the adjusting subunit is specifically configured to:
if the repetition times is equal to 1, further judging whether the MCS is the highest-order MCS, and if so, not adjusting the MCS; otherwise, increasing the MCS by one step; or
If the repetition number is greater than 1, reducing the repetition number by one step.
In a third aspect, an embodiment of the present invention provides an electronic device, including: a processor, a memory, a bus, and a computer program stored on the memory and executable on the processor;
the processor and the memory complete mutual communication through the bus;
the processor, when executing the computer program, implements the method described above.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the above method.
According to the modulation coding mode and repetition number selection method and device provided by the embodiment of the invention, the ACK/NACK feedback result transmitted by a user is monitored in real time, the block error rate in a period of time is counted, and the decision for adjusting the MCS and the repetition number is made according to the channel quality change reflected by the block error rate, and the basic principle is that the MCS is adjusted downwards or the repetition number is adjusted upwards when the channel quality is poor; the MCS is adjusted up or the repetition frequency is adjusted down when the channel quality is good, the maximum throughput can be realized on the basis of meeting the requirement of the block error rate, the scheme adjusts the MCS and the repetition frequency based on the ACK and NACK statistical result, tracks the change of the channel environment, does not occupy extra air interface resources, and is suitable for the scenes without SINR report or inaccurate SINR report.
Drawings
Fig. 1 is a schematic flowchart of an embodiment of a modulation and coding scheme and a repetition number selection method according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a modulation and coding scheme and repetition number selection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic physical structure diagram of an electronic device according to an 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 clearly 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 obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.
Referring to fig. 1, the present embodiment discloses a modulation and coding scheme and repetition number selection method, including:
s1, when the scheduling period of the user arrives, determining the NACK number according to the data in the maintained transmission result list of the user, wherein, the ACK or NACK feedback result of the data packet of the user is received each time and added into the list, the ACK feedback result represents the successful transmission of the data packet, and the NACK feedback result represents the failure of the transmission of the data packet;
s2, when judging that the NACK number is not less than the product of the configuration length of the transmission result list and a first value (the value can be set according to needs, such as 10%), inquiring a TBS mapping table according to the current buffer storage amount of the user, the number of sub-bands determined by the user bandwidth capacity, the current MCS and the repetition frequency, determining the number NF of wireless frames required to be occupied by the size of the transmission block meeting the buffer storage requirement, and adjusting the MCS or the repetition frequency according to the NF;
and S3, emptying the transmission result list.
According to the modulation coding mode and the repetition number selection method provided by the embodiment of the invention, the ACK/NACK feedback result transmitted by the user is monitored in real time, the block error rate in a period of time is counted, the decision for adjusting MCS and the repetition number is made according to the channel quality change reflected by the block error rate, and the throughput maximization can be realized on the basis of meeting the requirement of the block error rate.
The modulation and coding scheme and the repetition number selection method according to the embodiment of the present invention will be described in detail below.
The base station maintains a transmission result list of users, and the length of the list is configurable and represents the length of a BLER observation window. And adding the feedback result of ACK or NACK of the data packet of the user into the list every time the feedback result is received, wherein the ACK represents that the data packet transmission is successful, and the NACK represents that the data packet transmission is failed.
And every time the scheduling period of the user arrives, according to the data in the transmission result list, making the following judgment:
1. when the NACK number > -the configured length of the transmission result list-the first value,
according to the current buffer amount of a user, under the condition of the sub-band number, the current MCS and the repetition number determined by the bandwidth capacity of the user, inquiring a TBS mapping table, and determining the number of wireless frames (NF, NF >) required to be occupied by the size of a transmission block meeting the buffer requirement, wherein NF is 1. Judging whether NF is equal to 1 or more than 1, and dividing the conditions into the following two conditions:
(1) when NF is equal to 1, determine whether the number of repetitions reaches a maximum value? The maximum value here is the minimum value of the maximum value of the number of repetitions specified in the DCI format and the maximum value of the number of PDSCH or PUSCH radio frames specified in the current PDCCH cycle. If the number of repetitions does not reach the maximum value, the number of repetitions is increased by one step (the step as referred to herein may be set as desired, such as several steps within the authorized range); further determining if the MCS is the lowest order MCS (the lowest order MCS refers to the lowest gear within the MCS's grant) if the number of repetitions has reached the maximum value? If yes, no adjustment is carried out; otherwise, the MCS is decreased by one step.
(2) When NF is greater than 1, determine if MCS is the lowest order MCS? If not, the MCS is decreased by one step; if the MCS is the lowest order MCS, further determine whether the repetition number reaches the maximum value? If yes, no adjustment is carried out; otherwise, the number of repetitions is increased by one step.
And after the adjustment is finished, emptying the user transmission result list.
2. When the NACK number?
If equal to 1, further determine if the MCS is the highest order MCS (the highest order MCS refers to the highest gear within the MCS authorization scope)? If yes, no adjustment is carried out; otherwise, the MCS is increased by one step. Or if greater than 1, the number of repetitions is decreased by one step.
And after the adjustment is finished, emptying the user transmission result list.
The ratio of the number of NACKs to the configured length of the transmission result list indicates the block error rate, which reflects the quality of the channel. Down-regulating MCS or up-regulating repetition times when the channel quality is poor; and when the channel quality is good, the MCS is adjusted up or the repetition frequency is adjusted down, and the throughput maximization is realized on the basis of meeting the requirement of the block error rate. Specifically, when the channel quality is poor, and when the number of the wireless frames occupied by the transmission block required by the user with small buffer storage is 1, the repetition number is preferably adjusted up, and the MCS is then adjusted down; otherwise, the MCS is adjusted down first, and the number of repetitions is adjusted up second. When the channel quality becomes better, the number of repetitions is adjusted downward first, and the MCS is adjusted upward second.
Referring to fig. 2, the present embodiment discloses a modulation and coding scheme and repetition number selection apparatus, including:
the calculation unit 1 is configured to determine, when a scheduling period of a user arrives, a NACK number according to data in a maintained transmission result list of the user, where an ACK or NACK feedback result of a data packet received each time by the user is added to the list, the ACK feedback result indicates that the data packet is successfully transmitted, and the NACK feedback result indicates that the data packet is unsuccessfully transmitted;
an adjusting unit 2, configured to, when it is determined that the NACK number is not less than a product of the configuration length of the transmission result list and a first value, query a TBS mapping table according to a current buffer size of the user, a sub-band number determined by a user bandwidth capability, a current MCS, and a repetition number, determine a number of radio frames NF that needs to be occupied by a transport block size that meets a buffer requirement, and adjust the MCS or the repetition number according to the NF;
and the emptying unit 3 is used for emptying the transmission result list.
Specifically, when a scheduling period of a user arrives, the computing unit 1 determines the NACK number according to data in a maintained transmission result list of the user, wherein an ACK or NACK feedback result of a data packet of the user is received each time and added to the list, the ACK feedback result indicates that the data packet is successfully transmitted, and the NACK feedback result indicates that the data packet is failed to be transmitted; when judging that the NACK number is not less than the product of the configuration length of the transmission result list and a first numerical value, the adjusting unit 2 inquires a TBS mapping table according to the current buffer amount of the user, the sub-band number determined by the bandwidth capability of the user, the current MCS and the repetition frequency, determines the number of wireless frames NF required to be occupied by the size of the transmission block meeting the buffer requirement, and adjusts the MCS or the repetition frequency according to the NF; the emptying unit 3 empties the transmission result list.
It will be appreciated that the first value may be set as desired, for example to 10%.
The ratio of the NACK number to the configuration length of the transmission result list represents the block error rate, the modulation coding mode and the repetition frequency selection device provided by the embodiment of the invention can count the block error rate for a period of time by monitoring the ACK/NACK feedback result transmitted by a user in real time, and make a decision for adjusting MCS and the repetition frequency according to the channel quality change reflected by the block error rate, thereby realizing the maximization of throughput on the basis of meeting the requirement of the block error rate.
On the basis of the foregoing device embodiment, the adjusting unit may be specifically configured to perform the following steps:
judging whether the repetition times reach the maximum value or not when judging that NF is equal to 1, wherein the maximum value is the result of taking the minimum value from the maximum value of the repetition times specified by a DCI format and the maximum value of the number of PDSCH or PUSCH wireless frames specified by the current PDCCH period;
if the repetition number does not reach the maximum value, increasing the repetition number by one step length; or
If the repetition times reaches the maximum value, further judging whether the MCS is the lowest-order MCS, and if the MCS is the lowest-order MCS, not adjusting the MCS; otherwise, the MCS is decreased by one step.
In the embodiment of the invention, when the NACK number is judged and learned to be not less than the product of the configuration length of the transmission result list and a first numerical value, namely the channel quality is poor, when the number of the wireless frames occupied by the transmission block with smaller buffer storage amount of a user is 1, the repetition times are preferably adjusted upwards, and the MCS is then adjusted downwards.
On the basis of the foregoing device embodiment, the adjusting unit may be specifically configured to perform the following steps:
judging whether the MCS is the lowest order MCS or not when judging that the NF is larger than 1;
if the MCS is not the lowest order MCS, reducing the MCS by one step; or
If the MCS is the lowest-order MCS, further judging whether the repetition frequency reaches the maximum value, and if the repetition frequency reaches the maximum value, not adjusting the repetition frequency; otherwise, increasing the repetition times by one step, wherein the maximum value is the minimum value of the maximum value of the repetition times specified by the DCI format and the maximum value of the number of the PDSCH or PUSCH radio frames specified by the current PDCCH period.
In the embodiment of the invention, when the NACK number is judged and learned to be not less than the product of the configuration length of the transmission result list and a first numerical value, namely the channel quality is poor, when the number of the wireless frames occupied by the transmission blocks with smaller buffer storage amount of a user is more than the number, the MCS is adjusted down preferentially, and then the repetition number is adjusted up.
On the basis of the foregoing embodiment of the apparatus, the adjusting unit may further include the following structure not shown in the figure: a judgment subunit and an adjustment subunit; wherein,
the judging subunit judges whether the repetition frequency is equal to 1 or not when judging that the NACK number is not more than the product of the configuration length of the transmission result list and a second numerical value and the sum of the ACK number and the NACK number in the transmission result list is equal to the configuration length of the transmission result list, and sends the judging result to the adjusting subunit; and then, the adjusting subunit adjusts the MCS and the repetition times according to the judgment result.
It will be appreciated that the second value may be set as desired, such as to 1%.
On the basis of the foregoing device embodiment, the adjusting subunit may be specifically configured to perform the following steps:
if the repetition times is equal to 1, further judging whether the MCS is the highest-order MCS, and if so, not adjusting the MCS; otherwise, increasing the MCS by one step; or
If the repetition number is greater than 1, reducing the repetition number by one step.
In the embodiment of the invention, when the NACK number is judged to be not more than the product of the configuration length of the transmission result list and a second value, namely the channel quality is better, the number of repetition times is adjusted downwards preferentially, and then the MCS is adjusted upwards.
The modulation and coding scheme and repetition number selection apparatus of this embodiment may be used to implement the technical solutions of the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and are not described herein again.
The embodiment of the invention provides a scheme for selecting proper MCS and repetition times according to the statistical results of ACK and NACK, realizes the maximization of throughput on the basis of meeting the requirement of block error rate, and has the following advantages:
(1) the method is adaptive to different coverage requirements by introducing the adjustment of the repetition times;
(2) and adjusting MCS and repetition times based on the ACK and NACK statistical results, tracking the channel environment change, occupying no extra air interface resources, and being suitable for the scenes without SINR report or SINR report inaccuracy.
Fig. 3 is a schematic entity structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 3, the electronic device may include: a processor 11, a memory 12, a bus 13, and a computer program stored on the memory 12 and executable on the processor 11;
the processor 11 and the memory 12 complete mutual communication through the bus 13;
when the processor 11 executes the computer program, the method provided by the foregoing method embodiments is implemented, for example, including: when a scheduling period of a user arrives, determining the NACK number according to data in a maintained transmission result list of the user, wherein the ACK or NACK feedback result of a data packet of the user is received each time and added into the list, the ACK feedback result shows that the data packet is successfully transmitted, and the NACK feedback result shows that the data packet is failed to be transmitted; when the NACK number is judged and obtained to be not less than the product of the configuration length of the transmission result list and a first numerical value, inquiring a TBS mapping table according to the size of the current buffer memory of the user, the number of sub-bands determined by the bandwidth capability of the user, the current MCS and the repetition frequency, determining the number NF of wireless frames required to be occupied by the size of the transmission block meeting the buffer memory requirement, and adjusting the MCS or the repetition frequency according to the NF; and emptying the transmission result list.
An embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method provided by the foregoing method embodiments, and for example, the method includes: when a scheduling period of a user arrives, determining the NACK number according to data in a maintained transmission result list of the user, wherein the ACK or NACK feedback result of a data packet of the user is received each time and added into the list, the ACK feedback result shows that the data packet is successfully transmitted, and the NACK feedback result shows that the data packet is failed to be transmitted; when the NACK number is judged and obtained to be not less than the product of the configuration length of the transmission result list and a first numerical value, inquiring a TBS mapping table according to the size of the current buffer memory of the user, the number of sub-bands determined by the bandwidth capability of the user, the current MCS and the repetition frequency, determining the number NF of wireless frames required to be occupied by the size of the transmission block meeting the buffer memory requirement, and adjusting the MCS or the repetition frequency according to the NF; and emptying the transmission result list.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the present invention may be utilized alone or in combination with one or more other aspects and/or embodiments thereof.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. A modulation coding scheme and repetition number selection method is characterized by comprising the following steps:
s1, when the scheduling period of the user arrives, determining the NACK number according to the data in the maintained transmission result list of the user, wherein, the ACK or NACK feedback result of the data packet of the user is received each time and added into the list, the ACK feedback result represents the successful transmission of the data packet, and the NACK feedback result represents the failure of the transmission of the data packet;
s2, when judging and knowing that the NACK number is not less than the product of the configuration length of the transmission result list and a first numerical value, inquiring a TBS mapping table according to the current buffer storage amount of the user, the sub-band number determined by the user bandwidth capacity, the current MCS and the repetition frequency, determining the number of wireless frames NF required to be occupied by the transmission block size meeting the buffer storage requirement, and adjusting the MCS or the repetition frequency according to the NF;
s3, emptying the transmission result list;
the adjusting MCS or the number of repetitions according to the NF includes:
judging whether the repetition times reach the maximum value or not when judging that NF is equal to 1, wherein the maximum value is the result of taking the minimum value from the maximum value of the repetition times specified by a DCI format and the maximum value of the number of PDSCH or PUSCH wireless frames specified by the current PDCCH period;
if the repetition number does not reach the maximum value, increasing the repetition number by one step length; or
If the repetition times reaches the maximum value, further judging whether the MCS is the lowest-order MCS, and if the MCS is the lowest-order MCS, not adjusting the MCS; otherwise, reducing the MCS by one step;
judging whether the MCS is the lowest order MCS or not when judging that the NF is larger than 1;
if the MCS is not the lowest order MCS, reducing the MCS by one step; or
If the MCS is the lowest-order MCS, further judging whether the repetition frequency reaches the maximum value, and if the repetition frequency reaches the maximum value, not adjusting the repetition frequency; otherwise, increasing the repetition times by one step, wherein the maximum value is the minimum value of the maximum value of the repetition times specified by the DCI format and the maximum value of the number of the PDSCH or PUSCH radio frames specified by the current PDCCH period.
2. The method according to claim 1, wherein the S2 further comprises:
judging whether the number of times of repetition is equal to 1 or not when the NACK number is judged to be not more than the product of the configuration length of the transmission result list and a second numerical value and the sum of the ACK number and the NACK number in the transmission result list is equal to the configuration length of the transmission result list;
and adjusting the MCS and the repetition times according to the judgment result.
3. The method of claim 2, wherein the adjusting the MCS and the number of repetitions according to the determination comprises:
if the repetition times is equal to 1, further judging whether the MCS is the highest-order MCS, and if so, not adjusting the MCS; otherwise, increasing the MCS by one step; or
If the repetition number is greater than 1, reducing the repetition number by one step.
4. A modulation coding scheme and repetition number selection apparatus, comprising:
the computing unit is used for determining the NACK number according to the data in the maintained transmission result list of the user when the scheduling period of the user arrives, wherein, the ACK feedback result or the NACK feedback result of the data packet of the user is received each time and added into the list, the ACK feedback result represents that the data packet is successfully transmitted, and the NACK feedback result represents that the data packet is failed to be transmitted;
an adjusting unit, configured to, when it is determined that the NACK number is not less than a product of the configuration length of the transmission result list and a first value, query a TBS mapping table according to a current buffer size of the user, a sub-band number determined by a user bandwidth capability, a current MCS, and a repetition number, determine a number of radio frames NF that needs to be occupied by a transport block size that meets a buffering requirement, and adjust the MCS or the repetition number according to the NF;
the adjusting MCS or the number of repetitions according to the NF includes:
judging whether the repetition times reach the maximum value or not when judging that NF is equal to 1, wherein the maximum value is the result of taking the minimum value from the maximum value of the repetition times specified by a DCI format and the maximum value of the number of PDSCH or PUSCH wireless frames specified by the current PDCCH period;
if the repetition number does not reach the maximum value, increasing the repetition number by one step length; or
If the repetition times reaches the maximum value, further judging whether the MCS is the lowest-order MCS, and if the MCS is the lowest-order MCS, not adjusting the MCS; otherwise, reducing the MCS by one step;
judging whether the MCS is the lowest order MCS or not when judging that the NF is larger than 1;
if the MCS is not the lowest order MCS, reducing the MCS by one step; or
If the MCS is the lowest-order MCS, further judging whether the repetition frequency reaches the maximum value, and if the repetition frequency reaches the maximum value, not adjusting the repetition frequency; otherwise, increasing the repetition times by one step, wherein the maximum value is the minimum value of the maximum value of the repetition times specified by the DCI format and the maximum value of the number of the PDSCH or PUSCH wireless frames specified by the current PDCCH period;
and the emptying unit is used for emptying the transmission result list.
5. The apparatus according to claim 4, wherein the adjusting unit is specifically configured to:
judging whether the repetition times reach the maximum value or not when judging that NF is equal to 1, wherein the maximum value is the result of taking the minimum value from the maximum value of the repetition times specified by a DCI format and the maximum value of the number of PDSCH or PUSCH wireless frames specified by the current PDCCH period;
if the repetition number does not reach the maximum value, increasing the repetition number by one step length; or
If the repetition times reaches the maximum value, further judging whether the MCS is the lowest-order MCS, and if the MCS is the lowest-order MCS, not adjusting the MCS; otherwise, the MCS is decreased by one step.
6. The apparatus according to claim 4, wherein the adjusting unit is specifically configured to:
judging whether the MCS is the lowest order MCS or not when judging that the NF is larger than 1;
if the MCS is not the lowest order MCS, reducing the MCS by one step; or
If the MCS is the lowest-order MCS, further judging whether the repetition frequency reaches the maximum value, and if the repetition frequency reaches the maximum value, not adjusting the repetition frequency; otherwise, increasing the repetition times by one step, wherein the maximum value is the minimum value of the maximum value of the repetition times specified by the DCI format and the maximum value of the number of the PDSCH or PUSCH radio frames specified by the current PDCCH period.
7. An electronic device, comprising: a processor, a memory, a bus, and a computer program stored on the memory and executable on the processor;
the processor and the memory complete mutual communication through the bus;
the processor, when executing the computer program, implements the method of any of claims 1-3.
8. A non-transitory computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when executed by a processor, implements the method of any one of claims 1-3.
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| CN112217621B (en) * | 2019-07-12 | 2022-05-13 | 华为技术有限公司 | Feedback information processing method and equipment |
| CN112865887B (en) * | 2019-11-26 | 2022-11-08 | 成都鼎桥通信技术有限公司 | Method and device for determining repetition times and storage medium |
| CN113194481B (en) * | 2021-04-25 | 2023-08-11 | 国网电力科学研究院有限公司 | Uplink resource allocation and scheduling method, device and system |
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