CN116827487A

CN116827487A - Code rate control method, device and storage medium

Info

Publication number: CN116827487A
Application number: CN202311094526.6A
Authority: CN
Inventors: 吴泽楠; 李晓亮; 郝鹏; 刘大可
Original assignee: Polar Core Communication Technology Xi'an Co ltd; Jixin Communication Technology Nanjing Co ltd
Current assignee: Polar Core Communication Technology Xi'an Co ltd; Jixin Communication Technology Nanjing Co ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2023-09-29
Anticipated expiration: 2043-08-29
Also published as: CN116827487B

Abstract

The application provides a code rate control method, a code rate control device and a storage medium. The method relates to the technical field of communication, and is applied to network equipment and comprises the following steps: under the condition that the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, performing a reduced order operation on the MCS of the current channel until the target MCS is obtained; the target MCS satisfies: the effective code rate of the target MCS association is smaller than or equal to the target code rate of the target MCS association, and the low-density parity-check code LDPC base map of the target MCS association is equal to the LDPC base map of the MCS association of the current channel; and performing next-stage scheduling based on the target MCS. According to the code rate control method, the code rate control device and the storage medium, the effective coding code rate at the current moment is ensured not to exceed the target code rate by reducing the MCS and adjusting the scheduling parameter in real time, so that the UE can be ensured to decode in time, and the transmission rate is improved.

Description

Code rate control method, device and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and apparatus for controlling code rate, and a storage medium.

Background

In the digital signal processing process of wireless communication, operations such as encoding, scrambling, modulating and the like are required to be performed on an information bit stream to be transmitted. In a fourth generation mobile communication (4G), i.e., long term evolution (Long Term Evolution, LTE) system, and a fifth generation mobile communication (5G), i.e., new Radio, NR system, an appropriate modulation and coding strategy (Modulation and Coding Scheme, MCS) may be selected according to a channel change, so as to map an appropriate target code rate, so that a user with good channel quality obtains a higher rate, and an average throughput is improved.

However, for initial transmission, when the effective channel coding Rate is greater than the maximum target Rate supportable in the protocol by 0.95, or greater than the target Rate of the current channel, the terminal/User Equipment (UE) may not decode the transport Block, so that the Block Error Rate (BLER) increases, resulting in a decrease in the transmission Rate and affecting the User experience.

Disclosure of Invention

The embodiment of the application provides a code rate control method, a code rate control device and a storage medium, which are used for solving the technical problem of low transmission rate in the prior art.

In a first aspect, an embodiment of the present application provides a code rate control method, applied to a network device, including:

determining a target code rate of a current scheduling time slot and an effective code rate of the current scheduling time slot based on a modulation and coding strategy MCS of the current channel;

under the condition that the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, performing a reduced order operation on the MCS of the current channel until the target MCS is obtained; the target MCS satisfies: the effective code rate of the target MCS association is smaller than or equal to the target code rate of the target MCS association, and the low-density parity-check code LDPC base map of the target MCS association is equal to the LDPC base map of the MCS association of the current channel;

And performing next-stage scheduling based on the target MCS.

In some embodiments, performing a reduced order operation on the MCS of the current channel until a target MCS is obtained, comprising:

performing a reduced order operation on the MCS of the current channel until a first MCS is obtained; the effective code rate associated with the first MCS is smaller than or equal to the target code rate associated with the first MCS;

determining the LDPC base map associated with the first MCS and determining the LDPC base map associated with the MCS of the current channel;

under the condition that the LDPC base map associated with the first MCS is not equal to the LDPC base map associated with the MCS of the current channel, performing a reduced-order operation on the first MCS until a second MCS is obtained, and taking the second MCS as a target MCS; the effective code rate of the second MCS association is smaller than or equal to the target code rate of the second MCS association, and the LDPC base map of the second MCS association is equal to the LDPC base map of the MCS association of the current channel.

In some embodiments, the method further comprises:

inquiring an MCS index table based on the first MCS to obtain a modulation order QAM associated with the first MCS, and determining the size of a transmission block associated with the first MCS;

and calculating an effective code rate based on the modulation order associated with the first MCS and the size of the transmission block associated with the first MCS, so as to obtain the effective code rate associated with the first MCS.

In some embodiments, the method further comprises:

determining a target code rate associated with a first MCS based on a ratio of the modulation order of the current scheduling to the modulation order associated with the first MCS and a target code rate of the current scheduling time slot under the condition that the modulation order associated with the first MCS is smaller than the modulation order of the current scheduling; or alternatively, the first and second heat exchangers may be,

and under the condition that the modulation order associated with the first MCS is equal to the modulation order of the current scheduling, determining the target code rate associated with the first MCS as the target code rate of the current scheduling time slot.

In some embodiments, the determining the LDPC base graph associated with the first MCS comprises:

determining the LDPC base map associated with the first MCS based on the transport block size associated with the first MCS and a target code rate associated with the first MCS.

In some embodiments, the determining the target code rate of the current scheduling slot based on the modulation and coding strategy MCS of the current channel includes:

determining the mapped code rate in the MCS index table based on the MCS of the current channel;

and determining the target code rate of the current scheduling time slot based on the code rate mapped in the MCS index table and the maximum target code rate specified by the protocol.

In some embodiments, the method further comprises:

Judging that the terminal meets the enabling condition based on the scheduling parameters of the current scheduling time slot; the enabling conditions include at least one of:

there are rate-matched punctured resource elements REs;

the data service carried by the physical downlink shared channel PDSCH is transmitted in the symbol where the channel state information reference signal CSI-RS is located;

the data service carried by PDSCH is transmitted in the symbol where demodulation reference signal DMRS is located;

the time-frequency position of the transmission synchronization signal block SSB exists;

multiplexing PDCCH with PDSCH;

dynamic spectrum sharing.

In a second aspect, an embodiment of the present application provides a code rate control apparatus, including:

the determining module is used for determining a target code rate of the current scheduling time slot and an effective code rate of the current scheduling time slot based on the modulation and coding strategy MCS of the current channel;

the order reduction module is used for executing order reduction operation on the MCS of the current channel until a target MCS is obtained under the condition that the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot; the target MCS satisfies: the effective code rate of the target MCS association is smaller than or equal to the target code rate of the target MCS association, and the low-density parity-check code LDPC base map of the target MCS association is equal to the LDPC base map of the MCS association of the current channel;

And the scheduling module is used for carrying out next-stage scheduling based on the target MCS.

In a third aspect, an embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the code rate control method according to the first aspect when executing the program.

In a fourth aspect, embodiments of the present application also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a rate control method as described in the first aspect above.

In a fifth aspect, embodiments of the present application further provide a computer program product comprising a computer program which, when executed by a processor, implements a rate control method as described in the first aspect above.

According to the code rate control method, the code rate control device and the storage medium, the target code rate of the current scheduling time slot and the effective code rate of the current scheduling time slot are determined based on the modulation and coding strategy MCS of the current channel, if the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, the step-down operation is carried out on the MCS, so that the effective code rate obtained through recalculation does not exceed the target code rate and the base map is unchanged, real-time and self-adaptive code rate control is achieved, the terminal is guaranteed to be capable of decoding in time, and the transmission rate is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of a code rate control method according to an embodiment of the present application;

fig. 2 is a flowchart of an example scenario of a rate control method provided by an embodiment of the present application;

fig. 3 is a schematic structural diagram of a code rate control device according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The Code Rate (CR) is the efficiency of transmitting data in a transport block per unit time after the encoding is completed, i.e., the ratio of the actual transmission bits to the maximum number of bits that can be transmitted in one transport block. The greater the coding rate, the higher the efficiency. When the channel quality is poor, more redundant information needs to be added in order to ensure that the receiving end can correctly demodulate the signal, and the more redundant information means low coding rate; when the channel quality is good, less redundant information is needed to demodulate, so that the coding rate is improved.

The 3GPP protocol specifies that for initial transmission, if the effective channel coding rate is greater than 0.95 (i.e., the maximum target rate supportable in the current protocol) or the current scheduling target rate, the UE does not decode the transport block and the physical layer informs the higher layer of decoding failure, i.e., returns a negative acknowledgement (negative acknowledgement, NACK). NACK may cause the BLER to increase, resulting in a reduced transmission rate, affecting the user experience.

Based on the technical problems, the embodiment of the application provides a code rate control method, wherein network equipment calculates an effective code rate in real time according to the resource allocation condition of a current scheduling time slot (slot) and judges whether the effective code rate exceeds a target code rate of a current channel, if the effective code rate does not exceed the target code rate of the current channel, the network equipment transmits current scheduling information to a next-stage module to continue scheduling; if the target code rate of the current channel is exceeded, the base station side readjust the scheduling parameters at the current moment and continues to judge until the effective code rate does not exceed the target code rate. The code rate control is realized by adaptively judging the code rate and adjusting the scheduling parameters, so that the transmission rate is improved, and the user experience is improved.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Fig. 1 is a flow chart of a code rate control method provided by an embodiment of the present application, and as shown in fig. 1, an embodiment of the present application provides a code rate control method, an execution body of which may be a network device, for example, a base station or the like. The method comprises the following steps:

and step 101, determining a target code rate of the current scheduling time slot and an effective code rate of the current scheduling time slot based on the modulation and coding strategy MCS of the current channel.

Specifically, the MCS of the current channel is obtained through the transmission of the previous stage module, then the target code rate of the current scheduling time slot is calculated based on the MCS of the current channel, and the effective code rate (effective coding rate) of the current scheduling time slot is calculated by using a code rate calculation formula.

For example, according to an MCS index table (MCS index table) used in the current scheduling, a corresponding code rate R in the table is obtained based on an MCS table look-up table of the current channel, a threshold value is preset, a sum of the code rate R and the preset threshold value is calculated, and a minimum value of the sum and a maximum target code rate supported in the current protocol is calculated, so that the minimum value is determined to be the target code rate of the current scheduling.

For another example, MCS of the current channel, rank Indicator (RI) of the current scheduling slot, resource Element (RE) or Resource Block (RB) of the current scheduling slot, bandwidth occupied by the current scheduling UE in the current scheduling slot are transmitted through the previous stage module, and a transport Block size (denoted as tbsize_old) of the current scheduling slot is calculated based on these scheduling parameters. And obtaining the modulation order (marked as QAM_old) of the current scheduling based on the MCS table lookup of the current channel according to the MCS index table used by the current scheduling. And calculating the effective code rate of the current scheduling time slot by using a code rate calculation formula according to the size of the transmission block of the current scheduling time slot, the modulation order of the current scheduling, the cyclic redundancy check (Cyclic Redundancy Check, CRC) length of the current scheduling time slot, the effective RE number used by the PDSCH and the rank indication of the current scheduling time slot.

102, under the condition that the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, performing a reduced order operation on the MCS of the current channel until the target MCS is obtained; the target MCS satisfies: the effective code rate of the target MCS association is smaller than or equal to the target code rate of the target MCS association, and the low density parity check code LDPC base map of the target MCS association is equal to the LDPC base map of the MCS association of the current channel.

Specifically, the effective code rate of the current scheduling time slot and the target code rate of the current scheduling time slot are judged, and if the effective code rate of the current scheduling time slot is smaller than or equal to the target code rate of the current scheduling time slot, the current scheduling information is transmitted to a next-stage module to continue scheduling.

If the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, performing a reduced order operation on the MCS of the current channel until the target MCS meeting the following two conditions is obtained: the effective code rate of the target MCS association is smaller than or equal to the target code rate of the target MCS association; the Base map (BG) of the target MCS-associated low density parity check code (Low Density Parity Check Code, LDPC) is equal to the MCS-associated LDPC Base map of the current channel.

For example, when the effective code rate of the current scheduling time slot is greater than the target code rate of the current scheduling time slot, calculating the effective code rate again for every first order of MCS based on the reduced MCS and determining the target code rate, that is, updating the effective code rate and the target code rate in real time. And when the redetermined effective code rate is still larger than the target code rate, continuing to execute the reduced order operation on the MCS until the calculated effective code rate is smaller than or equal to the target code rate. Then, whether the LDPC base map related to the MCS at the moment is equal to the base map related to the MCS of the current channel or not is also needed to be judged, and if so, the reduced MCS at the moment is the target MCS; and if the two conditions are not equal, continuing to execute the order reduction operation until the MCS meeting the two conditions is obtained.

One way to determine the target code rate of the reduced MCS correlation is by determining whether the QAM is cross-stepped. If the QAM has a cross-order, the target code rate is changed along with the QAM, and the target code rate needs to be recalculated; if the QAM has no step, the target code rate is unchanged, and the target code rate is determined to be equal to the target code rate corresponding to the current channel MCS without recalculation.

Another way is to recalculate the target code rate associated with the reduced MCS for each reduction of the MCS without determining whether the QAM is cross-stepped.

Alternatively, the target code rate for the reduced MCS correlation may be calculated by the following formula:

wherein, the liquid crystal display device comprises a liquid crystal display device,representing the target code rate of the MCS association after the order reduction; />Representing the modulation order of the current schedule; />Represents the modulation order obtained by looking up the MCS index table based on the reduced MCS,and->May be the same or different; />Indicating the target code rate of the currently scheduled slot. The above formula is to update the target code rate according to the principle of unchanged spectrum efficiency.

And 103, performing next-stage scheduling based on the target MCS.

Specifically, after determining the target MCS, the effective code rate calculated based on the target MCS does not exceed the target code rate of the channel, so that the next-stage scheduling is performed based on the target MCS, that is, each scheduling parameter or scheduling information adjusted based on the target MCS is transmitted to the next-stage module to continue scheduling.

According to the code rate control method provided by the embodiment of the application, the target code rate of the current scheduling time slot and the effective code rate of the current scheduling time slot are determined based on the modulation and coding strategy MCS of the current channel, if the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, the step-down operation is carried out on the MCS, so that the effective code rate obtained by recalculation does not exceed the target code rate and the base map is unchanged, thereby realizing real-time and self-adaptive code rate control, ensuring that a terminal can decode in time and improving the transmission rate.

Specifically, under the condition that the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, performing a reduced order operation on the MCS of the current channel, and recalculating the effective code rate and determining the target code rate based on the reduced MCS when the order is reduced by one order, namely updating the effective code rate and the target code rate in real time. Suspending the order reduction until the updated effective code rate is less than or equal to the target code rate, and taking the MCS obtained by the order reduction at the moment as a first MCS.

Specifically, after obtaining a first MCS, determining an LDPC base map associated with the first MCS, comparing the LDPC base map with an LDPC base map associated with the MCS (i.e. the MCS of the current channel) before the order reduction, and if the LDPC base map and the LDPC base map are equal, determining the first MCS as a target MCS; if the two are not equal, the MCS is reduced, the effective code rate and the target code rate are redetermined until the effective code rate does not exceed the target code rate and the base maps are equal, the corresponding MCS is the second MCS, and the second MCS is used as the target MCS.

For example, when the effective code rate of the current scheduling slot is greater than the target code rate of the current scheduling slot, performing a reduced order operation on the MCS of the current channel to obtain MCS-1, calculating to obtain an effective code rate (effective code rate 1) based on the MCS-1, and looking up a table (MCS index table) to obtain that the modulation order is unchanged, so that the target code rate is still the target code rate (target code rate 0) of the current scheduling slot, and judging that the effective code rate 1 is less than or equal to the target code rate 0. And then calculating an LDPC base map as BG1 based on the MCS of the current channel and the target code rate 0, and calculating an LDPC base map as BG2 based on the MCS-1 and the target code rate 0, and continuing to execute the order reduction operation on the MCS-1 to obtain the MCS-2. And (3) recalculating an effective code rate (effective code rate 2) based on the MCS-2, and judging that the modulation order of the MCS-2 is unchanged, so that the target code rate is determined to be the target code rate 0, and judging that the effective code rate 1 is smaller than or equal to the target code rate 0. And then calculating and judging that the base map corresponding to the MCS-2 is BG1, and the base map associated with the MCS of the current channel is equal, so that the MCS-2 is determined as the target MCS.

For another example, the MCS of the current channel is subjected to the reduced order operation to obtain MCS-1, an effective code rate (effective code rate 1) is calculated based on MCS-1, and a table look-up (MCS index table) knows that the modulation order becomes smaller (i.e. smaller than the modulation order obtained by the table look-up of the MCS of the current channel), so that the target code rate needs to be converted and updated to obtain an updated target code rate (target code rate 1). And if the effective code rate 1 is judged to be larger than the target code rate 1, continuing to reduce the order to obtain the MCS-2, determining the effective code rate (effective code rate 2) and the target code rate (target code rate 2) corresponding to the MCS-2 in the same way, and judging that the effective code rate 2 is smaller than or equal to the target code rate 2. Then, the LDPC base map associated with the MCS-2 is judged to be equal to the base map associated with the MCS of the current channel, so that the MCS-2 is determined as the target MCS.

In some embodiments, the determining the LDPC base graph associated with the first MCS comprises: determining the LDPC base map associated with the first MCS based on the transport block size associated with the first MCS and a target code rate associated with the first MCS.

According to the code rate control method provided by the embodiment of the application, the effective code rate updated in real time and the target code rate are compared, the LDPC base map updated in real time is continuously judged under the condition that the effective code rate does not exceed the target code rate, when the base maps related to the MCS of the updated LDPC base map and the current channel are equal, the next scheduling can be continuously carried out based on the MCS after the step reduction at the moment, the terminal is ensured to be capable of correctly decoding, meanwhile, the judgment of the effective code rate is firstly carried out, and then the judgment of the LDPC base map is carried out, so that the rate of code rate control or code rate determination is improved, and the transmission rate is further improved.

In some embodiments, the method further comprises:

inquiring an MCS index table based on the first MCS to obtain a modulation order associated with the first MCS, and determining the size of a transmission block associated with the first MCS;

Specifically, for determining the effective code rate of the first MCS association, firstly, inquiring an MCS index table based on the first MCS to map to obtain a modulation order of the first MCS association, wherein the MCS index table refers to an MCS index table currently scheduled for use, determining a transport block size (TBSize) of the first MCS association, and calculating the effective code rate based on the modulation order of the first MCS association and the transport block size of the first MCS association.

The size of the transmission block associated with the first MCS is calculated based on the first MCS, the RI of the current scheduling time slot, the RE/RB of the current scheduling time slot and the bandwidth occupied by the current scheduling UE in the current scheduling time slot.

According to the code rate control method provided by the embodiment of the application, the effective code rate is updated in real time by reducing the order of the MCS and adjusting the scheduling parameters, so that the code rate judgment and control are performed in real time, and the transmission rate is improved.

In some embodiments, the method further comprises:

determining a target code rate associated with the first MCS based on a ratio of the modulation order of the current schedule to the modulation order associated with the first MCS and a target code rate of the current schedule slot under the condition that the modulation order associated with the first MCS is smaller than the modulation order of the current schedule; or alternatively, the first and second heat exchangers may be,

Specifically, due to the reduced order of the MCS, the quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) may also be reduced in order, and when the QAM is changed, the code rate in the MCS index table may be suddenly increased, so that the target code rate update is required. When the modulation order associated with the first MCS is smaller than the modulation order of the current scheduling, the target code rate is updated in a conversion mode based on the following formula:

wherein, the liquid crystal display device comprises a liquid crystal display device,representing the target code rate of the MCS association after the order reduction; />Representing the modulation order of the current schedule; />Represents the modulation order obtained by looking up the MCS index table based on the reduced MCS, And->May be the same or different; />Indicating the target code rate of the currently scheduled slot.

And when the modulation order associated with the first MCS is equal to the modulation order of the current scheduling, updating calculation of the target code rate is not needed.

According to the code rate control method provided by the embodiment of the application, when the effective code rate is required to be judged to exceed the target code rate by crossing the QAM modulation mode, the target code rate is converted and updated by adopting the target code rate updating formula according to the principle of unchanged frequency spectrum efficiency, so that the real-time updating and determining of the target code rate are realized, the effective code rate is ensured not to exceed the target code rate, and the smooth decoding of UE is ensured.

Specifically, the MCS index table used in current scheduling is queried according to the MCS of the current channel to find the code rate R of the MCS mapping of the current channel, and then the target code rate of the current scheduling time slot is determined to be min (r+cr_tolearatethr, 0.95), wherein min () represents a minimum function, cr_tolearatethr represents a preset threshold value, and 0.95 is the supportable maximum target code rate specified in the current protocol.

In some embodiments, the method further comprises:

there are rate-matched punctured REs;

data traffic carried by a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) is transmitted on symbols where channel state information Reference signals (Channel State Information-Reference Signal, CSI-RS) are located;

data traffic carried by the PDSCH is transmitted in a symbol where a demodulation reference signal (Demodulation Reference Signal, DMRS) is located;

the presence of a time-frequency position of the transmitted synchronization signal block (Synchronization Signal Block, SSB);

multiplexing PDCCH with PDSCH;

dynamic spectrum sharing.

Specifically, before determining the target code rate of the current scheduling slot and the effective code rate of the current scheduling slot based on the MCS of the current channel, it is necessary to determine UEs satisfying the above-mentioned enabling conditions, and perform code rate control for UEs satisfying one or more of the enabling conditions.

According to the code rate control method provided by the embodiment of the application, whether the current UE meets the enabling condition is judged according to the current scheduling parameter condition, if so, the code rate control is carried out, the possibility of unsuccessful decoding or scheduling is reduced, and the UE is ensured to decode smoothly.

Fig. 2 is a flowchart of an example scenario of a code rate control method provided by the embodiment of the present application, where, as shown in fig. 2, a network device adaptively determines whether a UE meets an enabling condition, determines a target code rate and an effective code rate, determines whether a new BG is equal to an old BG and/or a new QAM is equal to an old QAM, and corresponds to a parameter associated with a reduced MCS, and corresponds to a parameter associated with an MCS of a current channel. The code rate control method provided by each embodiment is further described below by way of specific examples:

example 1: in this example, the system bandwidth is 20MHz,106RB.

Step 1: calculating a target code rate:

(1) And in each scheduling time slot (slot), according to the current scheduling parameter condition, the rate matching and puncturing RE is arranged, and the UE in the current time slot is judged to meet the enabling condition, and the code block flow is entered.

(2) The MCS for the current channel is obtained, which is passed in by the previous stage module, denoted mcs_old, and mcs_old=27.

(3) And according to the MCS index table used by the current scheduling, obtaining the modulation order of the current scheduling through the MCS_old table, and marking the modulation order as QAM_old, wherein QAM_old=8.

(4) The corresponding code rate R in the table is obtained by looking up the mcs_old table, and the Target code rate of the current scheduling is obtained according to the formula min (r+cr_tolearatethr, 0.95), and is denoted as code_target, in this example, code_target=0.95.

(5) RI (rank indication) of the current scheduling slot is obtained through the previous stage module, and is denoted as ri_old, where ri_old=2 in this example.

(6) The number of orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbols allocated to PDSCH by the current scheduling slot is transferred and acquired by the previous stage module and is denoted as symbol_rb, in this example symbol_rb=11.

(7) According to symbol_RB and number N of subcarriers per RB _SC Through the formula min (symbol_RB×N _SC 156) calculates the RE/RB number of the current scheduling slot, which is recorded as N _RE N in this example _RE = 132。

(8) The bandwidth occupied by the current scheduling UE in the current scheduling slot is acquired through the transmission of the previous stage module and is denoted as rb_num, in this example, rb_num=106.

(9) Based on the scheduling parameters obtained in the steps (2), (5), (7) and (8), the TBSize (transport block size) of the current scheduling slot is calculated and is denoted as tbsize_old, and in this example, tbsize_old= 208976 is calculated.

(10) And judging whether the LDPC base map is BG1 or BG2 by using TBSzie_old and the current target code rate, and marking the LDPC base map as BG_old, wherein in the example, BG_old=BG1.

Step 2: calculating an effective coding rate:

(1) The CRC length of the current scheduling slot is obtained by the previous stage module transfer and is denoted as crc_len, in this example crc_len=24.

(2) A resource block of the current scheduling slot satisfying the condition of step 1 (1) is acquired and denoted as rb_ocp, in this example rb_ocp=24.

(3) The number of symbols of the current scheduling slot satisfying the condition of step 1 (1) is obtained and denoted symbol_ocp, in this example symbol_ocp=2.

(4) According to the scheduling parameters of step (7), (8) and step (2), (3), the effective RE number used by PDSCH is calculated by using the following formula and is marked as RE_valid:

wherein, RE_valid represents the effective RE number used by PDSCH; n (N) _RE The RE/RB number representing the current scheduling time slot; RB_Num represents the bandwidth occupied by the current scheduling UE in the current scheduling slot; rb_ocp represents a resource block in which the current scheduling slot satisfies the enabling condition; symbol_ocp represents the number of symbols that the current scheduling slot satisfies the enabling condition; n (N) _SC Indicating the number of subcarriers per RB. In this example, re_valid=132×106-24×2×12= 13416 is calculated according to a formula.

(5) According to the scheduling parameters in the steps (3), (5), (9) and the steps (1), (4), calculating the effective coding rate of the current scheduling slot by using the following formula, and marking the effective coding rate as CodeRate_valid:

wherein, the CodeRate_valid represents the effective coding rate of the current scheduling time slot; RE_valid represents the number of valid REs used by PDSCH; QAM_old represents the modulation order of the current schedule; ri_old represents a rank indication of a current scheduled slot; tbsize_old represents the transport block size of the currently scheduled slot; crc_len represents the CRC length of the currently scheduled slot.

Step 3: judging whether the effective coding rate exceeds a target rate:

(1) And judging the relation between the effective coding rate CodeRate_valid and the Target coding rate CodeRate_target. In this example, coderate_valid=0.974, and coderate_target=0.95. The CodeRate_valid is determined to be greater than CodeRate_Target.

(2) The MCS is lowered by a first order, i.e., mcs_new=mcs_old-1=26, and the above-described procedure is restarted from (9) in step 1.

(3) Mapping by MCS_new table lookup to obtain QAM_new, calculating to obtain TBSize_new, and finally calculating to obtain new CodeRate_validnew (RI, symbol number occupied by PDSCH and N) _RE Not with changes in MCS, without requiring recalculation). Qam_new=8, tbsize_new=200808, and recalculate coderate_valid=0.935 in this example.

(4) Judging that the CodeRate_validnew is smaller than the CodeRate_Target.

(5) After the MCS order reduction satisfies that the CodeRate_valid is smaller than or equal to CodeRate_Target, judging whether the BG_new obtained in the step (10) in the step (1) after the MCS order reduction is equal to the BG_old or not. Bg_new=bg_old=bg1 in this example.

(6) And the code rate control module flow is ended, and the next stage of scheduling is continued.

In the MCS order reduction process, there may be a cross-order change of QAM, and when the QAM changes, the code rate in the MCS index table will suddenly increase, so that the target code rate needs to be updated, and the updating basis is the principle of equal frequency spectrum efficiency. In this example qam_new=qam_old=8, and no target code rate update is required.

Example 2: in this example, the system bandwidth is 20MHz,106RB.

Step 1: calculating a target code rate:

(1) And in each scheduling slot, according to the current scheduling parameter condition, the rate matching and puncturing RE is arranged, the UE in the current slot is judged to meet the enabling condition, and the code block flow is entered.

(2) The channel MCS for the current channel is delivered and acquired by the previous stage module and is denoted as mcs_old, in this example mcs_old=20.

(3) And obtaining the modulation order of the current scheduling according to the MCS index table used by the current scheduling through an MCS_old table lookup, and marking the modulation order as QAM_old, wherein in the example, the modulation order is QAM_old=8.

(4) And obtaining a corresponding code rate R in a table through MCS_old table lookup according to the MCS index table used by the current scheduling, and obtaining a Target code rate of the current scheduling according to a formula min (R+CR_TolerateTHr, 0.95), wherein the Target code rate is recorded as a code_target, and in the example, the code_target=0.696.

(5) The RI of the current scheduling slot is acquired through the previous stage module, and is denoted as ri_old, where ri_old=4 in this example.

(6) The number of OFDM symbols allocated to PDSCH by the current scheduling slot is transferred and acquired by the previous stage module and is denoted symbol_rb, in this example symbol_rb=11.

(9) According to the scheduling parameters obtained in the steps (2), (5), (7) and (8), the TBSize of the current scheduling slot is calculated and obtained, and is denoted as tbsize_old, and in this example, tbsize_old= 295176 is calculated and obtained.

Step 2: calculating an effective coding rate:

(2) A resource block, denoted rb_ocp=48 in this example, is acquired for which the current scheduling slot satisfies the condition of step 1 (1).

Re_valid=132×106-48×2×12=12840 is calculated according to the formula in this example.

step 3: judging whether the effective coding rate exceeds a target rate:

(1) And judging the relation between the effective coding rate CodeRate_valid and the Target coding rate CodeRate_target. In this example, coderate_valid=0.718, and coderate_target=0.696. Judging that the CodeRate_valid is larger than the CodeRate_Target.

(2) The MCS is lowered by a first order, that is, mcs_new=mcs_old-1=19, and the above-described procedure is restarted from (9) in step 1.

(3) Mapping by MCS_new table lookup to obtain QAM_new, calculating to obtain TBSize_new, and finally calculating to obtain new CodeRate_validnew, (Symbol number and N occupied by RI and PDSCH) _RE Not with changes in MCS, without requiring recalculation). Qam_new=6 in this example, tbsize_new= 286976.

At this time, step 4 is performed as needed, and in this example, since qam_new is smaller than qam_old, step 4 is performed, and the process goes to step 4.

Step 4: updating the target code rate:

(1) In step 3 (2), whenever the MCS is lowered by a first order re-execution procedure, it is necessary to use the mcs_new table look-up map to obtain qam_new. In this example, if qam_new is smaller than qam_old, the target code rate needs to be updated using the following formula:

the CodeRate_TargetNew represents an updated target code rate, namely a target code rate associated with the reduced MCS; QAM_old represents the modulation order of the current schedule; QAM_new represents the modulation order obtained by inquiring the MCS index table based on the MCS after the order reduction; the coderate_target represents the Target code rate of the currently scheduled slot.

(2) And comparing the updated target code rate with the effective code rate, and continuing to execute the subsequent steps.

Step 5: continuously judging whether the effective coding rate exceeds the target rate:

(1) Recalculate coderate_validnew=0.698; the target code rate updated by the step 4 is as follows: coderate_target=0.928, satisfying that coderate_valid is smaller than coderate_target.

(2) After the MCS reduced order meets the condition that the CodeRate_valid is smaller than or equal to CodeRate_Target, judging whether BG_new and BG_old obtained after the MCS reduced order are equal. Bg_new=bg_old=bg1 in this example.

(3) And the code rate control module flow is ended, and the next stage of scheduling is continued.

Example 3: in this embodiment, the system bandwidth is 10mhz,52rb.

Step 1: calculating a target code rate:

(2) The channel MCS for the current channel is obtained and is passed in by the previous stage module, denoted mcs_old, in this example mcs_old=27.

(3) And obtaining the modulation order of the current scheduling according to the MCS index table used by the current scheduling through MCS_old table lookup, and marking the modulation order as QAM_old, wherein in the example, the QAM_old=8.

(4) Obtaining a corresponding code rate R in a table through MCS_old table lookup according to an MCS index table used by current scheduling, and obtaining a Target code rate from a min (R+CR_TolerateTHr, 0.95) to the current scheduling according to a formula, wherein the Target code rate is denoted as a code_target, and in the example, the code_target=0.95.

(5) The RI of the current scheduling slot is acquired through the previous stage module, and is denoted as ri_old, where ri_old=2 in this example.

(8) The bandwidth occupied by the current scheduling UE in the current scheduling slot is acquired through the transmission of the previous stage module and is denoted as rb_num, in this example, rb_num=52.

(9) According to the scheduling parameters obtained in the steps (2), (5), (7) and (8), the TBSize of the current scheduling slot is calculated and obtained, and is denoted as tbsize_old, and in this example, tbsize_old= 102416 is calculated and obtained.

Step 2: calculating an effective coding rate:

(2) A Resource Block (RB) of the current scheduling slot satisfying the condition of (1) in step 1 is acquired, denoted as rb_ocp, in this example rb_ocp=10.

(3) The number of symbols of the current scheduling slot satisfying the condition of (1) in step 1 is acquired and denoted symbol_ocp, in this example symbol_ocp=4.

Re_valid=132×52-10×4×12=6384 is calculated according to the formula in this example.

(5) According to the scheduling parameters in the steps (3), (5), (9) and (1), (4) in the step (1), the effective coding rate of the current scheduling slot is calculated by using the following formula and is recorded as CodeRate_valid.

Step 3: judging whether the effective coding rate exceeds a target rate:

(1) And judging the relation between the effective code rate CodeRate_valid and the Target code rate CodeRate_target. In this example, coderate_valid=1.0, and coderate_target=0.95. The CodeRate_valid is determined to be greater than CodeRate_Target.

(2) The MCS is lowered by a first order, that is, mcs_new=mcs_old-1=26, and the above-described procedure is restarted from step 1 (9).

(3) Mapping by MCS_new table lookup to obtain QAM_new, calculating to obtain TBSize_new, and finally calculating to obtain new CodeRate_validnew, (Symbol number and N occupied by RI and PDSCH) _RE Not with changes in MCS, without requiring recalculation). In this example qam_new=8, tbsize_new= 98376, and coderate_valid=0.963 is recalculated.

(4) The MCS continues to decrease by a first order, i.e., mcs_new 1=mcs_new-1=25, if coderate_valid is still greater than coderate_target, and the above procedure is restarted from step 1 (9).

(5) And mapping by using an MCS_new table lookup to obtain QAM_new1, calculating to obtain TBSize_new1, and finally calculating to obtain a new CodeRate_validnew1. In this example qam_new 1=8, tbsize_new 1= 94248, and coderate_valid_new 1=0.82 is recalculated.

(6) The CodeRate_validnew1 is determined to be less than CodeRate_Target.

(7) After the MCS order reduction satisfies that the CodeRate_valid is smaller than or equal to CodeRate_Target, judging whether the BG_new obtained in the step (10) in the step (1) after the MCS order reduction is equal to the BG_old or not. Bg_new=bg_old=bg1 in this example.

(8) And the code rate control module flow is ended, and the next stage of scheduling is continued.

In this example qam_new=qam_old=8, so no target code rate update is required.

According to the code rate control method provided by the embodiment of the application, the target code rate of the current scheduling time slot and the effective code rate of the current scheduling time slot are determined based on the modulation and coding strategy MCS of the current channel, if the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, the step-down operation is carried out on the MCS, so that the effective code rate obtained by recalculation does not exceed the target code rate and the base map is unchanged, and therefore real-time and self-adaptive code rate control is realized, and for receiving end equipment, the time-frequency resources occupied by the PDCCH can be identified which can be used for transmitting the PDSCH, the time-frequency resources of the PDSCH are increased, and the transmission rate is improved.

The code rate control method provided by the embodiment of the application is provided with self-adaptive judgment logic, and can carry out self-adaptive judgment in real time according to the resource allocation condition and the quantity condition of the scheduling UE in the current network, and the code rate control method is enabled under proper conditions so as to improve the transmission rate of a part of UE; the rate control method may also be disabled when appropriate to avoid or reduce the impact on a large number of UEs in the network.

Fig. 3 is a schematic structural diagram of a rate control device according to an embodiment of the present application, and as shown in fig. 3, the embodiment of the present application provides a rate control device, which includes a determining module 301, a reducing module 302, and a scheduling module 303.

The generating module 301 is configured to determine a target code rate of a current scheduling slot and an effective code rate of the current scheduling slot based on a modulation and coding strategy MCS of the current channel. The order reduction module 302 is configured to perform an order reduction operation on the MCS of the current channel until a target MCS is obtained, where an effective code rate of the current scheduling slot is greater than a target code rate of the current scheduling slot; the target MCS satisfies: the effective code rate of the target MCS association is smaller than or equal to the target code rate of the target MCS association, and the low density parity check code LDPC base map of the target MCS association is equal to the LDPC base map of the MCS association of the current channel. The scheduling module 303 is configured to perform next-stage scheduling based on the target MCS.

In some embodiments, the order reduction module includes a first order reduction unit, a first determination unit, and a second order reduction unit.

The first order reduction unit is used for performing order reduction operation on the MCS of the current channel until a first MCS is obtained; and the effective code rate of the first MCS association is smaller than or equal to the target code rate of the first MCS association. The first determining unit is configured to determine the first MCS-associated LDPC base map and determine an MCS-associated LDPC base map of a current channel. The second order reduction unit is configured to perform order reduction operation on the first MCS until a second MCS is obtained, and take the second MCS as a target MCS, where the LDPC base map associated with the first MCS is not equal to the LDPC base map associated with the MCS of the current channel; the effective code rate of the second MCS association is smaller than or equal to the target code rate of the second MCS association, and the LDPC base map of the second MCS association is equal to the LDPC base map of the MCS association of the current channel.

In some embodiments, the order reduction module further comprises a query unit and a calculation unit.

The inquiring unit is used for inquiring the MCS index table based on the first MCS to obtain the modulation order QAM associated with the first MCS, and determining the size of the transmission block associated with the first MCS. The calculating unit is used for calculating an effective code rate based on the modulation order associated with the first MCS and the size of the transmission block associated with the first MCS, and obtaining the effective code rate associated with the first MCS.

In some embodiments, the order reduction module further comprises:

a second determining unit, configured to determine, when a modulation order associated with a first MCS is smaller than a modulation order of a current schedule, a target code rate associated with the first MCS based on a ratio of the modulation order of the current schedule to the modulation order associated with the first MCS and a target code rate of the current schedule slot; or, a third determining unit, configured to determine, when the modulation order associated with the first MCS is equal to the modulation order of the current scheduling, that the target code rate associated with the first MCS is the target code rate of the current scheduling slot.

In some embodiments, the first determining unit comprises:

a determining subunit, configured to determine an LDPC base graph associated with the first MCS based on a transport block size associated with the first MCS and a target code rate associated with the first MCS.

In some embodiments, the determination module includes a fourth determination unit and a fifth determination unit.

The fourth determining unit is configured to determine a code rate mapped in the MCS index table based on the MCS of the current channel. The fifth determining unit is configured to determine a target code rate of the current scheduling slot based on the code rate mapped in the MCS index table and a maximum target code rate specified by a protocol.

In some embodiments, further comprising:

the judging module is used for judging that the terminal meets the enabling condition based on the scheduling parameters of the current scheduling time slot; the enabling conditions include at least one of: there are rate-matched punctured resource elements REs; the data service carried by the physical downlink shared channel PDSCH is transmitted in the symbol where the channel state information reference signal CSI-RS is located; the data service carried by PDSCH is transmitted in the symbol where demodulation reference signal DMRS is located; the time-frequency position of the transmission synchronization signal block SSB exists; multiplexing PDCCH with PDSCH; dynamic spectrum sharing.

Specifically, the above-mentioned rate control device provided by the embodiment of the present application can implement all the method steps implemented by the above-mentioned rate control method embodiment, and can achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in this embodiment are not described in detail herein.

It should be noted that the division of the units/modules in the above embodiments of the present application is merely a logic function division, and other division manners may be implemented in practice. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application, as shown in fig. 4, where the electronic device may include: a processor (processor) 401, a communication interface (Communications Interface) 402, a memory (memory) 403 and a communication bus 404, wherein the processor 401, the communication interface 402 and the memory 403 complete communication with each other through the communication bus 404. The processor 401 may invoke logic instructions in the memory 403 to perform a rate control method comprising:

determining a target code rate of a current scheduling time slot and an effective code rate of the current scheduling time slot based on a modulation and coding strategy MCS of the current channel; under the condition that the effective code rate of the current scheduling time slot is larger than the target code rate of the current scheduling time slot, performing a reduced order operation on the MCS of the current channel until the target MCS is obtained; the target MCS satisfies: the effective code rate of the target MCS association is smaller than or equal to the target code rate of the target MCS association, and the low-density parity-check code LDPC base map of the target MCS association is equal to the LDPC base map of the MCS association of the current channel; and performing next-stage scheduling based on the target MCS.

Specifically, the processor 401 may be a central processing unit (Central Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), and the processor may also employ a multi-core architecture.

The logic instructions in memory 403 may be implemented in the form of software functional units and stored in a processor-readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In some embodiments, there is also provided a computer program product, including a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of executing the code rate control method provided by the above method embodiments, the method comprising:

Specifically, the computer program product provided by the embodiment of the present application can implement all the method steps implemented by the above method embodiments, and can achieve the same technical effects, and the parts and beneficial effects that are the same as those of the method embodiments in this embodiment are not described in detail herein.

In some embodiments, there is also provided a computer-readable storage medium storing a computer program for causing a computer to execute the code rate control method provided by the above-described method embodiments.

Specifically, the computer readable storage medium provided by the embodiment of the present application can implement all the method steps implemented by the above method embodiments and achieve the same technical effects, and the parts and beneficial effects that are the same as those of the method embodiments in this embodiment are not described in detail herein.

It should be noted that: the computer readable storage medium may be any available medium or data storage device that can be accessed by a processor including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, nonvolatile memory (NAND FLASH), solid State Disk (SSD)), etc.

In addition, it should be noted that: the terms "first," "second," and the like in embodiments of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more.

The term "determining B based on a" in the present application means that a is a factor to be considered in determining B. Not limited to "B can be determined based on A alone", it should also include: "B based on A and C", "B based on A, C and E", "C based on A, further B based on C", etc. Additionally, a may be included as a condition for determining B, for example, "when a satisfies a first condition, B is determined using a first method"; for another example, "when a satisfies the second condition, B" is determined, etc.; for another example, "when a satisfies the third condition, B" is determined based on the first parameter, and the like. Of course, a may be a condition in which a is a factor for determining B, for example, "when a satisfies the first condition, C is determined using the first method, and B is further determined based on C", or the like.

It will be appreciated by those skilled in the art that 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, magnetic disk storage, 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable 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 processor-executable instructions may also be stored in a processor-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 processor-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 processor-executable 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 will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A method for rate control, applied to a network device, comprising:

and performing next-stage scheduling based on the target MCS.

2. The rate control method according to claim 1, characterized in that performing a reduced order operation on the MCS of the current channel until a target MCS is obtained, comprising:

3. The rate control method of claim 2, further comprising:

4. The rate control method of claim 2, further comprising:

5. The code rate control method of claim 2, wherein the determining the first MCS-associated LDPC base map comprises:

6. The method for controlling the code rate according to claim 1, wherein the determining the target code rate of the current scheduling slot based on the modulation and coding scheme MCS of the current channel comprises:

7. The rate control method of claim 1, further comprising:

there are rate-matched punctured resource elements REs;

multiplexing PDCCH with PDSCH;

dynamic spectrum sharing.

8. A rate control apparatus, comprising:

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements the code rate control method of any of claims 1 to 7 when the program is executed by the processor.

10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the rate control method according to any one of claims 1 to 7.