CN109687949B - Method and device for determining 5G demodulation reference signal distribution - Google Patents
Method and device for determining 5G demodulation reference signal distribution Download PDFInfo
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- CN109687949B CN109687949B CN201910116783.2A CN201910116783A CN109687949B CN 109687949 B CN109687949 B CN 109687949B CN 201910116783 A CN201910116783 A CN 201910116783A CN 109687949 B CN109687949 B CN 109687949B
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Abstract
The embodiment of the invention provides a method and a device for determining 5G demodulation reference signal distribution, which are applied to a base station and comprise the following steps: receiving an allocation identification value corresponding to the conversion condition reported by the user equipment, wherein the allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by calculating the counter before the change by the user equipment according to the accuracy of the received data; and determining a demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment according to the distribution identification value reported by the user equipment. The method and the device for determining the 5G demodulation reference signal distribution can give consideration to the transmission quantity of effective data and the accuracy of channel estimation.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for determining 5G demodulation reference signal allocation.
Background
The rapid development of the mobile internet and internet of things markets, business applications and the like promotes the rapid promotion of the business requirements of the fifth-Generation communication technology (5th-Generation, 5G). The report indicates that, compared with the fourth Generation communication technology (4th-Generation, 4G), the transmission rate of 5G is required to be increased by 10-100 times, the density of the connected devices is increased by 10-100 times, the user experience rate is 0.1-1 Gb/s, and the like, and meanwhile, the indexes such as energy efficiency, spectrum efficiency, peak rate, and the like are considered.
One prominent goal of 5G is to significantly increase the capacity of current wireless networks. As a key component of 5G, a large-scale Multiple-Input Multiple-Output (MIMO) system may simultaneously serve Multiple User Equipments (UEs) using a low-complexity linear precoding scheme to achieve efficient spectrum sharing. The MIMO provides enough space freedom degree by increasing the number of antennas and changing the antenna array, furthest excavates space resources, and introduces an optimization criterion with priority energy efficiency, so that the data transmission rate and the link reliability can be greatly improved, the huge requirements of a communication system on the channel capacity and the spectrum utilization rate can be met, the MIMO has a great development prospect, and the MIMO is valued and researched by scholars and experts at home and abroad.
The performance of massive MIMO depends mainly on the accuracy of Channel State Information (CSI). The receiver of the user equipment performs channel estimation for each antenna based on an unknown Reference Signal (RS), and restores a downlink signal transmitted by the base station based on the estimated channel.
The propagation path between the transmitting end and the receiving end of the wireless channel is very complex and has great randomness. Demodulation Reference Signal (DMRS) is one of the most important 5G Reference signals and is used to evaluate a wireless channel to facilitate Signal Demodulation.
Specifically, the base station transmits the DMRS while transmitting a transmission signal to the user equipment. The DMRS is known to the user equipment, and the user equipment performs channel estimation through the DMRS, and then demodulates a received signal based on the estimated channel, where the received signal may be understood as a transmission signal received by the user equipment. Since the recovery of the channel depends on the channel estimation of the DMRS, which is a necessary process for data demodulation, the estimation performance of the DMRS on the channel plays a decisive role for data demodulation.
Wherein the base station transmits the DMRS by mapping the DMRS to a physical resource. And allocation of demodulation reference signals is an important aspect in mapping DMRSs to physical resources.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for determining 5G demodulation reference signal allocation, so as to take account of the transmission quantity of effective data and the accuracy of channel estimation. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a method for determining 5G demodulation reference signal allocation, which is applied to a base station, and includes:
receiving an allocation identification value corresponding to a conversion condition, wherein the allocation identification value is reported by user equipment when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of received data;
and determining a demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment according to the distribution identification value reported by the user equipment.
Optionally, after determining the demodulation reference signal allocation manner corresponding to the allocation identifier reported by the ue, the method further includes:
and allocating resources according to the demodulation reference signal allocation mode corresponding to the allocation identification value reported by the user equipment.
Optionally, before receiving the assigned identifier value corresponding to the transition condition reported by the user equipment, the method further includes:
initializing the assigned identification value;
and determining an initialized demodulation reference signal distribution mode corresponding to the initialized distribution identification value.
Optionally, after determining the initialized demodulation reference signal allocation manner corresponding to the initialized allocation identifier value, the method further includes:
and performing initial resource allocation according to the initialized demodulation reference signal allocation mode.
Optionally, the demodulation reference signal allocation manner includes an insertion position where the demodulation reference signal is mapped to a physical resource.
In a second aspect, an embodiment of the present invention provides a method for determining 5G demodulation reference signal allocation, which is applied to a user equipment, and includes:
receiving data sent by a base station;
judging whether the received data is correct or not;
when the received data is correct, subtracting a first preset value from the counter before change to obtain a changed counter; when the received data is wrong, increasing a second preset value for the counter before change to obtain a changed counter;
when the changed counter meets the conversion condition, reporting the distribution identification value corresponding to the conversion condition to the base station, so that the base station determines the distribution mode of the demodulation reference signal according to the distribution identification value corresponding to the conversion condition.
Optionally, the data includes Cyclic Redundancy Check (CRC);
the determining whether the received data is correct includes:
judging whether the data meet a preset rule or not according to the CRC;
when the data meets the preset rule, determining that the received data is correct;
when the data does not meet the preset rule, determining that the received data is wrong.
Optionally, reporting, when the changed counter meets a conversion condition, an allocation identifier value corresponding to the conversion condition to the base station, including:
when the changed counter reaches a first range, reporting a first distribution identification value corresponding to the first range to the base station;
when the changed counter reaches a second range, reporting a second allocation identification value corresponding to the second range to the base station;
when the changed counter reaches a third range, reporting a third distribution identification value corresponding to the third range to the base station;
and when the changed counter reaches a fourth range, reporting a fourth distribution identification value corresponding to the fourth range to the base station.
In a third aspect, an embodiment of the present invention provides a device for determining 5G demodulation reference signal allocation, which is applied to a base station, and includes:
a receiving module, configured to receive an allocation identification value corresponding to a conversion condition, where the allocation identification value reported by a user equipment is reported when it is determined that a changed counter meets the conversion condition, and the changed counter is obtained by calculating, by the user equipment, a counter before change according to accuracy of received data;
and the determining module is used for determining a demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment according to the distribution identification value reported by the user equipment.
In a fourth aspect, an embodiment of the present invention provides a device for determining 5G demodulation reference signal allocation, which is applied to a user equipment, and includes:
the receiving module is used for receiving data sent by the base station;
the judging module is used for judging whether the received data is correct or not;
the conversion module is used for subtracting a first preset value from the counter before change when the received data is correct to obtain the counter after change; when the received data is wrong, increasing a second preset value for the counter before change to obtain a changed counter;
and a reporting module, configured to report, when the changed counter meets a conversion condition, the allocation identifier value corresponding to the conversion condition to the base station, so that the base station determines a demodulation reference signal allocation manner according to the allocation identifier value corresponding to the conversion condition.
The method and the device for determining 5G demodulation reference signal allocation provided by the embodiment of the invention can determine the demodulation reference signal allocation mode corresponding to the allocation identification value reported by the user equipment according to the allocation identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously. Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1(a) is a schematic diagram illustrating an insertion manner of a DL-DMRS-add-pos equal to 0 in an embodiment of the present invention;
FIG. 1(b) is a schematic diagram illustrating an insertion manner of a DL-DMRS-add-pos equal to 1 in an embodiment of the present invention;
FIG. 1(c) is a schematic diagram illustrating an insertion manner of a DL-DMRS-add-pos equal to 2 in an embodiment of the present invention;
FIG. 1(d) is a schematic diagram illustrating an insertion manner of a DL-DMRS-add-pos equal to 3 in an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for determining 5G demodulation reference signal allocation according to an embodiment of the present invention;
fig. 3 is another schematic flow chart of a method for determining 5G demodulation reference signal allocation according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of an embodiment of the present invention;
fig. 5(a) is a schematic diagram illustrating a relationship between signal-to-noise ratios and bit error rates of different DMRS densities in an embodiment of the present invention;
fig. 5(b) is a schematic diagram illustrating a relationship between signal-to-noise ratios of different DMRS densities and effective resource utilization in an embodiment of the present invention;
fig. 5(c) is a schematic diagram illustrating a relationship between signal-to-noise ratios and bit error rates of different scheduling intervals of DMRS in the embodiment of the present invention;
fig. 5(d) is a schematic diagram illustrating a relationship between signal-to-noise ratios of different scheduling intervals of DMRS and an effective data resource utilization rate in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a device for determining 5G demodulation reference signal allocation according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a determination apparatus for 5G demodulation reference signal allocation according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The estimation performance of the DMRS on the channel has a close relationship with the allocation of the demodulation reference signals. The determination of the demodulation reference signal allocation manner may also be understood as the determination of the demodulation reference signal density.
In 5G, the density of DMRS is set by the higher layer parameter DL-DMRS-add-pos. The overall transmission resource is fixed, and when the DMRS density is high, the resource occupied by the corresponding effective data is reduced. Existing 5G protocols only define DMRS generation schemes, and do not discuss specific use of DMRS.
The allocation of DMRS affects the amount of transmission of useful data on one hand and the accuracy of channel estimation on the other hand. In the latest 5G protocols, the use of DMRS is fixed at one single density configuration. This results in either a large amount of valid data being transmitted but with poor accuracy, or a high amount of valid data being transmitted but with less accuracy, and a compromise point cannot be found.
The embodiment of the invention provides a scheme for adjusting the adaptive density of a 5G demodulation reference signal, and can also be understood as providing an adaptive determination mode for allocating the 5G demodulation reference signal. The invention provides a method for determining 5G demodulation reference signal allocation, which can simultaneously give consideration to the transmission quantity of effective data and the accuracy of channel estimation in the application of a 5G DMRS. The following describes in detail a method for determining allocation of 5G demodulation reference signals according to an embodiment of the present invention.
The generation of DMRS and the specific insertion location are first introduced to look at the performance of DMRS transmission for different densities.
DMRS is one of the most important 5G reference signals used for evaluating a wireless channel to facilitate signal demodulation. DMRS is a user terminal specific reference signal (i.e., DMRS signal for each terminal is different), may be beamformed, may be incorporated into scheduled resources, and may be transmitted only when needed (either in the uplink or downlink direction). To support multi-layer MIMO transmission, a plurality of orthogonal DMRS ports may be scheduled, where each DMRS port corresponds to each layer of MIMO. "orthogonal" can be achieved by Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), and Code Division Multiplexing (CDM) (cyclic shift with base sequence or orthogonal mask) in a comb structure. The DMRS may select DMRS density in the time domain according to different scenarios to meet the accuracy requirement for channel estimation.
The DMRS employs a pseudo-random sequence, and the pilot sequence is a length-31 Gold sequence and is generated by two m-sequences, where the m-sequence is defined as:
the initialization is as follows:
wherein m is the mth sequence symbol, ciintFor the initialization of the sequence, l is the number of symbols in the time slot, nsIs the number of time slots in a radio frame, nSCID∈{0,1}，
And n isSCIDAnd
is a parameter set by a higher-layer parameter DL-DMRS-add-pos, defaults to nSCID＝0，
Is the ID of the cell.
The following describes a process of mapping the demodulation parameter signals to physical resources.
In a PDSCH (physical downlink shared channel) scenario, a UE (user equipment) may select type1 or type2 according to a higher layer parameter DL-DMRS-config-type to map to physical resources, which are represented by: type2 can use more ports. When different types are selected, the corresponding positions of the inserted pilots, i.e. demodulation reference signals, and the values of the pilots are also different. Wherein type1 has two CDM groups (interference is solved by code division between the same CDM and frequency division between different CDM), and type2 has three CDM groups.
Scaling of UE by DMRS power βDMRSScaling a transmission sequence r according to a ratiomAnd mapped to physical resources by the following formula.
k/═ 0,1, k/are intermediate variables.
n＝0,1,…
1)wf(k/)、wt(/) and Δ are set by tables 1 and 2, which are intermediate variables for calculating pilot symbols.
2) Reference point l and DMRS first location l0Is set according to the mapping type. Type A, l under PDSCH mapping is related to the number of symbols in the slot, and l is when DL-DMRS-type A-pos is equal to 30Not 3, otherwise02. In type B scenario, l is the starting position definition relative to scheduled PDSCH resources, l 00 is set by tables 3 and 4.
Wherein table 1 is Parameters for PDSCH DMRS configuration (DMRS parameter configuration mode 1) type1, and table 2 is Parameters for PDSCH DMRS configuration type 2; table 3 shows PDSCH DMRS positions for single-symbol DMRS and table 4 shows PDSCH DMRS positions for double-symbol DMRS, where in table 3 and table 4, Duration of PDSCH transmission indicates PDSCH transmission Duration, PDSCH mapping type a indicates PDSCH mapping type a, PDSCH mapping type B indicates PDSCH mapping type B, and DM-RS positions
Indicates the insertion position of DMRS. The details are as follows.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
In the embodiment of the present invention, type1 is adopted and is designed for a single-symbol, where the single-symbol refers to a continuous length of 1 in the time domain, and with respect to a double, the double refers to a continuous length of 2 in the time domain, and the time domain density is configured by a DL-DMRS-add-pos parameter, and has the mode as shown in fig. 1(a), fig. 1(b), fig. 1(c), and fig. 1(d), where fig. 1(a) is a schematic diagram of an insertion mode in which DL-DMRS-add-pos is equal to 0, and can also be understood as a pilot insertion scheme; FIG. 1(b) is a schematic diagram of an insertion scheme in which DL-DMRS-add-pos is equal to 1; FIG. 1(c) is a schematic diagram of an insertion scheme with DL-DMRS-add-pos equal to 2; FIG. 1(d) is a diagram illustrating an insertion scheme of DL-DMRS-add-pos equal to 3. The pilot insertion can also be understood as an insertion position where the demodulation reference signal is mapped to the physical resource. Wherein the insertion locations include even-numbered slots (even-numbered slots) and odd-numbered slots (odd-numbered slots).
Different DMRS densities determine the quality of the channel estimation, which directly affects the reliability of data transmission. However, the total number of transmission resources is fixed, and when the density of the DMRS becomes high, the corresponding effective transmission data becomes small. Thus, there is a conflict between the quality of channel estimation and the amount of transmission of useful data. The method for determining 5G demodulation reference signal allocation provided by the embodiment of the invention selects the appropriate DMRS density aiming at the current actual channel, thereby ensuring the validity of the transmission data and the effective transmission data amount.
An embodiment of the present invention provides a method for determining 5G demodulation reference signal allocation, as shown in fig. 2, applied to a base station, where the method may include:
s201, receiving the distribution identification value corresponding to the conversion condition reported by the user equipment.
In an alternative implementation, the assigned identification value may be 0,1, 2, 3. Wherein, the larger the value is, the higher the density of the demodulation reference signal is, and when the assigned identification value is 3, the density of the demodulation reference signal is the highest. The different assignment flag values correspond to different demodulation reference signal assignment manners, such as the demodulation reference signal assignment manners of 0,1, 2, and 3 in sequence in fig. 1(a), 1(b), 1(c), and 1 (d).
The distribution identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data.
The user equipment determines to determine an allocation identification value according to the accuracy of the received data, and reports the allocation identification value meeting the conversion condition to the base station when the allocation identification value meets the conversion condition. Specifically, as shown in fig. 3, the method may include:
s301, receiving data sent by the base station.
Cyclic Redundancy Check (CRC) codes may be included in the data;
s302, judging whether the received data is correct. When the received data is correct, step S303 is performed, and when the received data is incorrect, step S304 is performed.
Specifically, the process of determining whether the received data is correct may include:
and A1, judging whether the data meet the preset rule according to the CRC.
And A2, when the data meets the preset rule, determining that the received data is correct.
And A3, when the data does not meet the preset rule, determining that the received data is wrong.
The preset rule may be that the sum of odd bits in the data is a fixed value, or the sum of even bits is a fixed value, and so on. The preset rule may be any rule used in the verification through the CRC, and the embodiment of the present invention does not limit the preset rule, and any rule that can determine whether the data is correct through the CRC is within the protection scope of the embodiment of the present invention.
The correctness or inaccuracy of the received data may reflect the channel quality. If the received data is correct, the channel quality of the transmitted data is better, and if the received data is wrong, the channel quality of the transmitted data is poorer.
And S303, subtracting the first preset value from the counter before the change to obtain the counter after the change.
In one implementation, the initialization counter is an assigned identification value, such as 3, when the demodulation reference signal density is the highest.
When the received data is correct, the channel quality can be understood to be better, and the demodulation reference signals with lower density can be used for allocation, so that the estimation accuracy can be ensured and the transmission quantity of effective data can be improved at the same time in the process of channel estimation through the demodulation reference signals.
Therefore, when the received data is correct, the counter before the change is subtracted by the first preset value to obtain the counter after the change.
The first preset value can be determined according to experimental verification or actual requirements. Such as 0.1, 0.01, 0.001.
And S304, increasing a second preset value to the counter before the change to obtain the changed counter.
When the received data is wrong, the channel quality can be understood to be poor, demodulation reference signals with high density can be used for allocation, and the estimation accuracy can be improved on the premise of ensuring the transmission quantity of effective data in the process of channel estimation through the demodulation reference signals.
Therefore, when the received data is correct, the counter before the change is increased by the second preset value, and the changed counter is obtained.
The second preset value can be determined according to experimental verification or actual requirements. Such as 0.9, 0.09, 0.009.
S305, when the changed counter meets the conversion condition, reporting the distribution identification value corresponding to the conversion condition to the base station, so that the base station determines the distribution mode of the demodulation reference signal according to the distribution identification value corresponding to the conversion condition.
The transition condition may also be understood as a condition corresponding to the channel quality. That is, it can be understood that when the channel quality satisfies different transition conditions, the ue reports the assignment flag value corresponding to the transition condition to the base station, and then the base station determines the demodulation reference signal assignment manner according to the assignment flag value corresponding to the transition condition.
Specifically, the method may include:
and when the changed counter reaches a first range, reporting a first distribution identification value corresponding to the first range to the base station.
And when the changed counter reaches a second range, reporting a second distribution identification value corresponding to the second range to the base station.
And when the changed counter reaches a third range, reporting a third distribution identification value corresponding to the third range to the base station.
And when the changed counter reaches a fourth range, reporting a fourth distribution identification value corresponding to the fourth range to the base station.
The first allocation identification value corresponding to the first range and the first range, the second allocation identification value corresponding to the second range and the second range, the third allocation identification value corresponding to the third range and the third range, and the fourth allocation identification value corresponding to the fourth range and the fourth range may be preset, and may specifically be determined according to experimental verification or actual requirements.
S202, according to the distribution identification value reported by the user equipment, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment is determined.
The determination process of the demodulation reference signal allocation manner can also be understood as a determination process of the demodulation reference signal density.
The demodulation reference signal allocation mode comprises an insertion position of the demodulation reference signal mapping to the physical resource. As shown in fig. 1(a), 1(b), 1(c) and 1 (d).
For example, the assigned identification value may include 0,1, 2, and 3, and the corresponding demodulation reference signal assignment manner when the assigned identification value is 0 may be determined, as shown in fig. 1 (a); the corresponding demodulation reference signal allocation manner when the allocation identification value is 1 can be determined, as shown in fig. 1 (b); the corresponding demodulation reference signal allocation manner when the allocation identification value is 2 can be determined, as shown in fig. 1 (c); the corresponding demodulation reference signal allocation manner when the allocation flag value is 3 can be determined, as shown in fig. 1 (d).
In an implementation manner, after determining a demodulation reference signal allocation manner corresponding to an allocation identifier value reported by a user equipment, the method may further include:
and carrying out resource allocation according to the demodulation reference signal allocation mode corresponding to the allocation identification value reported by the user equipment.
It is simply understood that the demodulation reference signals are mapped to the physical resources according to the determined demodulation reference signal allocation manner.
In the embodiment of the invention, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment can be determined according to the distribution identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously.
In an alternative embodiment of the present invention, in step S202: before receiving the assignment identifier value corresponding to the transition condition reported by the user equipment, the method may further include:
initializing the assigned identification value; and determining an initialized demodulation reference signal distribution mode corresponding to the initialized distribution identification value.
The base station is completely unaware of the channel condition of the information transmission, and in order to ensure the reliability of data transmission, the allocation flag value may be initialized to an allocation flag value that can make the demodulation parameter signal allocation density the highest, such as setting DL-DMRS-add-pos to the highest density value of DMRS, i.e., equal to 3.
In an optional embodiment, after determining an initialized demodulation reference signal allocation manner corresponding to the initialized allocation identifier value, the method may further include:
and performing initial resource allocation according to the initial demodulation reference signal allocation mode.
And mapping the demodulation reference signals to physical resources according to an initial demodulation reference signal distribution mode.
An embodiment of the present invention is also provided, as shown in fig. 4. The DMRS density determination process is a determination process of a demodulation reference signal allocation scheme.
Different DMRS densities determine the quality of the channel estimation, which directly affects the reliability of data transmission. However, the total number of transmission resources is fixed, and when the density of the DMRS becomes high, the corresponding effective transmission data becomes small. Thus, there is a conflict between the quality of channel estimation and the amount of transmission of useful data. The method for determining 5G demodulation reference signal allocation provided by the embodiment of the invention aims at selecting proper DMRS density for the current actual channel, and not only ensures the validity of transmission data, but also ensures the effective transmission data amount. In the third Generation Partnership Project (3 GPP), it is required that the block error rate of system transmission is not more than 0.1, that is, the number of erroneous blocks is 1/10, which means that the embodiment of the present invention selects the lowest DMRS density to increase the amount of effective data transmission under the condition that the error rate of data transmission is not more than 0.1.
By signaling initialization of a DMRS density, specifically initialization of DL-DMRS-add-pos, the DL-DMRS-add-pos can be determined to be 3, and thus, the demodulation reference signal density is highest in the initialization process.
It is determined whether data is transmitted for the first time. If so, carrying out resource allocation on the DMRS by using the initialized DL-DMRS-add-pos; and if not, carrying out resource allocation on the DMRS by using the fed-back DL-DMRS-add-pos.
The user side, such as the user equipment, records the number of correct or incorrect received data.
A counting mechanism for correct or wrong received data is introduced at a user terminal. Therefore, the quality situation of data transmission under the current DMRS density can be effectively known.
Then, it is determined whether the correct or incorrect block reaches a threshold value. If so, the user equipment modifies the DL-DMRS-add-pos and reports the modified DL-DMRS-add-pos; and if not, not processing the DL-DMRS-add-pos.
Specifically, in order to ensure that the block error rate of the transmission is not greater than 0.1, i.e. the erroneous block accounts for 1/10 of the total number of blocks. Here, a relative value is selected for correct or incorrect. The value of the recorded variable is increased by 0.9, 0.09, or 0.009 when the UE finds that the transport block is erroneous, and vice versa, by 0.1, 0.01, or 0.001 when the UE finds that the transport block is correct. The recorded variable value is a counter recorded correctly or incorrectly according to the received data in the above embodiment.
When the variable value is more than 3 or more than 2 and less than 3, reporting the value of DL-DMRS-add-pos as 3; when the variable value is more than 1 and less than or equal to 2, reporting the DL-DMRS-add-pos as 2; when the variable value is more than 0 and less than or equal to 2, reporting the DL-DMRS-add-pos as 1; and when the variable value is less than or equal to 0, reporting the value of the DL-DMRS-add-pos as 0.
The embodiment of the invention introduces a DMRS self-adaptive adjustment scheme in the data transmission process, namely a determination method for 5G demodulation reference signal allocation. In 5G, the accuracy of channel estimation of the DMRS plays a decisive role in data demodulation, and the accuracy of channel estimation is closely related to the insertion density of the DMRS, but when the insertion density of the DMRS is higher, the transmitted effective data can be greatly reduced. For the 5G protocol, no detailed implementation is made for the protocol, and the embodiment of the present invention proposes the determination of the allocation of the 5G demodulation reference signal around balancing the relationship between the insertion density of the DMRS and the number of the transmission effective data, so as to greatly improve the transmission amount of the effective data while effectively ensuring the reliability of the system transmission.
In an alternative embodiment of the present invention,
when the reward of the UE is 0.1, it means that the upper layer parameter DL-DMRS-add-pos can be modified only if the number of consecutive correct UEs is 10, which results in relatively low reliability of the overall performance, but can quickly reach the optimal value of resource utilization. When the reward at the UE side is 0.001, it means that the number of consecutive correct DL-DMRS-add-pos can be modified only by 1000, which results in relatively high reliability of the overall performance, but it takes a long time to reach the optimal value of resource utilization. When the value of the reward of the UE, that is, the data received by the UE, is correct, the value of the recorded variable is reduced to a value.
When the transport block is correct, simulation experiments are performed in the embodiment of the present invention for the UE whose reward is 0.1, 0.01, or 0.001.
In order to verify that gains of the DMRSs under the conditions of different densities are greatly different, different DMRS densities are simulated under the same simulation scene.
FIG. 5(a) is a diagram illustrating the relationship between SIGNAL-to-NOISE RATIO (SNR) and Bit Error Rate (BER) of different DMRS densities; fig. 5(b) is a schematic diagram of a relationship between SNRs with different DMRS densities and effective resource utilization. Specifically including dmrsad0、DMRSadd1、DMRSadd2、DMRSadd3Four different cases.
As can be seen from fig. 5(a) and 5(b), as the DMRS density increases, the final bit error rate of the system decreases. However, at each DMRS density, the effective data resource utilization rate for system transmission (herein, the effective data resource utilization rate refers to the ratio of resources occupied by effective transmission data to all resources) is constant, and as the DMRS density increases, the resource utilization rate of effective data decreases.
Fig. 5(c) is a diagram illustrating SNR versus BER for different scheduling intervals of DMRS; fig. 5(d) is a schematic diagram illustrating a relationship between SNRs of different scheduling intervals of DMRS and an effective data resource utilization rate. Specifically, the Scheduling interval (Scheduling interval) is 0.1, the Scheduling interval is 0.01, and the Scheduling interval is 0.001.
The scheduling interval refers to a relative value of the reward when the transmission block is correct, when the scheduling interval is 0.1, it means that 10 consecutive correct blocks are required to adjust the density of the DMRS, and when the scheduling interval is 0.001, it means that 1000 consecutive correct blocks are required to adjust the density of the DMRS.
As can be seen from fig. 5(c) and 5(d), when the channel quality is greater than 2db, the bit error rate decreases as the scheduling interval decreases, but the resource utilization rate of the useful data increases. The optimal scheduling interval is determined to be 0.01 through simulation verification, and as can be seen from the figure, the optimal scheduling interval is not much different from the scheduling interval of 0.001 in bit error rate, but can almost reach the level of 0.1 in resource utilization rate. The balance problem of the effectiveness of data transmission and the utilization rate of effective data resources is effectively considered.
Regarding the value of the UE reward, it is most reasonable to choose 0.01 through simulation verification. In the case of achieving the system transmission performance closest to 0.001, the optimal value of resource utilization can be achieved quickly.
In actual wireless communication system design deployment, the accuracy of DMRS estimation is a determining factor of information transmission effectiveness. In the transmission process of the system, the effectiveness and reliability of information transmission are absolutely guaranteed, the block error rate of system transmission is required to be not more than 0.1 in 3GPP, namely the number of error blocks is 1/10 of the total number of blocks, and the transmission quantity of effective data and the accuracy of channel estimation are considered on the base line that the block error rate is not more than 0.1.
An embodiment of the present invention further provides a device for determining 5G demodulation reference signal allocation, which is applied to a base station, and as shown in fig. 6, the device may include:
a receiving module 601, configured to receive an allocation identifier value corresponding to a conversion condition, where the allocation identifier value reported by the ue is reported when it is determined that a changed counter meets the conversion condition, and the changed counter is obtained by calculating, by the ue, the counter before the change according to accuracy of received data;
the determining module 602 is configured to determine, according to the allocation identifier reported by the ue, a demodulation reference signal allocation manner corresponding to the allocation identifier reported by the ue.
In the embodiment of the invention, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment can be determined according to the distribution identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously.
Optionally, the apparatus further comprises:
and the first allocation module is used for performing resource allocation according to the demodulation reference signal allocation mode corresponding to the allocation identification value reported by the user equipment after determining the demodulation reference signal allocation mode corresponding to the allocation identification value reported by the user equipment.
Optionally, the apparatus further comprises:
the initialization module is used for initializing the distribution identification value;
the determining module 602 is further configured to determine an initialized demodulation reference signal allocation manner corresponding to the initialized allocation identifier value.
Optionally, the apparatus further comprises:
and the second allocation module is used for performing initial resource allocation according to the initialized demodulation reference signal allocation mode after determining the initialized demodulation reference signal allocation mode corresponding to the initialized allocation identification value.
Optionally, the demodulation reference signal allocation manner includes an insertion position where the demodulation reference signal is mapped to the physical resource.
It should be noted that the apparatus for determining 5G demodulation reference signal allocation provided in the embodiment of the present invention is an apparatus to which the above method for determining 5G demodulation reference signal allocation applied to a base station is applied, and all embodiments of the above method for determining 5G demodulation reference signal allocation applied to a base station are applicable to the apparatus and can achieve the same or similar beneficial effects.
An embodiment of the present invention further provides a device for determining 5G demodulation reference signal allocation, which is applied to a user equipment, and as shown in fig. 7, the device may include:
a receiving module 701, configured to receive data sent by a base station;
a judging module 702, configured to judge whether the received data is correct;
a conversion module 703, configured to subtract the first preset value from the counter before the change when the received data is correct, to obtain a changed counter; when the received data is wrong, increasing a second preset value for the counter before change to obtain a changed counter;
a reporting module 704, configured to report the assignment identifier value corresponding to the conversion condition to the base station when the changed counter meets the conversion condition, so that the base station determines a demodulation reference signal assignment manner according to the assignment identifier value corresponding to the conversion condition.
In the embodiment of the invention, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment can be determined according to the distribution identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously.
Optionally, the data includes Cyclic Redundancy Check (CRC);
a determining module 702, specifically configured to determine whether the data meets a preset rule according to the CRC; when the data meets a preset rule, determining that the received data is correct; and when the data does not meet the preset rule, determining that the received data is wrong.
Optionally, the reporting module 704 is specifically configured to report, when the changed counter reaches the first range, the first allocation identifier corresponding to the first range to the base station; when the changed counter reaches a second range, reporting a second distribution identification value corresponding to the second range to the base station; when the changed counter reaches a third range, reporting a third distribution identification value corresponding to the third range to the base station; and when the changed counter reaches a fourth range, reporting a fourth distribution identification value corresponding to the fourth range to the base station.
It should be noted that the apparatus for determining 5G demodulation reference signal allocation provided in the embodiment of the present invention is an apparatus to which the above method for determining 5G demodulation reference signal allocation applied to a user equipment is applied, and all embodiments of the above method for determining 5G demodulation reference signal allocation applied to a user equipment are applicable to the apparatus and can achieve the same or similar beneficial effects.
An embodiment of the present invention further provides an electronic device, as shown in fig. 8, including a processor 801, a communication interface 802, a memory 803, and a communication bus 804, where the processor 801, the communication interface 802, and the memory 803 complete mutual communication through the communication bus 804.
A memory 803 for storing a computer program;
the processor 801 is configured to implement the method steps of the method for determining 5G demodulation reference signal allocation applied to the base station when executing the program stored in the memory 803.
In the embodiment of the invention, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment can be determined according to the distribution identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously.
The embodiment of the present invention further provides an electronic device, as shown in fig. 9, which includes a processor 901, a communication interface 902, a memory 903 and a communication bus 904, where the processor 901, the communication interface 902, and the memory 903 complete mutual communication through the communication bus 904.
A memory 903 for storing computer programs;
the processor 901 is configured to implement the method steps of the method for determining allocation of 5G demodulation reference signals applied to the ue when executing the program stored in the memory 903.
In the embodiment of the invention, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment can be determined according to the distribution identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
The embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when being executed by a processor, implements the method steps of the method for determining 5G demodulation reference signal allocation applied to a base station.
In the embodiment of the invention, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment can be determined according to the distribution identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously.
The embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when being executed by a processor, implements the method steps of the method for determining 5G demodulation reference signal allocation applied to the user equipment.
In the embodiment of the invention, the demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment can be determined according to the distribution identification value reported by the user. The allocation identification value reported by the user equipment is reported when the changed counter meets the conversion condition, and the changed counter is obtained by the user equipment through calculation on the counter before the change according to the accuracy of the received data, namely, the allocation identification value corresponding to the conversion condition can be determined in a self-adaptive manner according to the accuracy of the data received by the user equipment, and the allocation mode of the demodulation reference signal is further determined in a self-adaptive manner. Therefore, the transmission quantity of the effective data and the accuracy of the channel estimation can be considered simultaneously.
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.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device, apparatus, and computer-readable storage medium embodiments, because they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A method for determining 5G demodulation reference signal allocation is applied to a base station, and comprises the following steps:
receiving an allocation identification value corresponding to a conversion condition reported by user equipment, wherein the allocation identification value reported by the user equipment comprises a first allocation identification value corresponding to a first range reported to the base station when a changed counter reaches the first range; when the changed counter reaches a second range, reporting to a second allocation identification value corresponding to the second range of the base station; when the changed counter reaches a third range, reporting to a third distribution identification value corresponding to the third range of the base station; when the changed counter reaches a fourth range, reporting to a fourth distribution identification value corresponding to the fourth range of the base station; the changed counter is the data sent by the base station received by the user equipment; judging whether the received data is correct or not; when the received data is correct, subtracting a first preset value from a counter before change to obtain the counter after change; when the received data is wrong, increasing a counter before change by a second preset value to obtain the changed counter; the distribution identification value is positively correlated with the demodulation reference signal density;
and determining a demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment according to the distribution identification value reported by the user equipment.
2. The method according to claim 1, wherein after determining the demodulation reference signal allocation manner corresponding to the allocation identifier reported by the ue, the method further comprises:
and allocating resources according to the demodulation reference signal allocation mode corresponding to the allocation identification value reported by the user equipment.
3. The method of claim 1, wherein before receiving the assigned identification value corresponding to the transition condition reported by the ue, the method further comprises:
initializing the assigned identification value;
and determining an initialized demodulation reference signal distribution mode corresponding to the initialized distribution identification value.
4. The method according to claim 3, wherein after determining the initialized demodulation reference signal allocation manner corresponding to the initialized allocation identification value, the method further comprises:
and performing initial resource allocation according to the initialized demodulation reference signal allocation mode.
5. The method according to any of claims 1 to 4, wherein the demodulation reference signal allocation pattern comprises an insertion position of the demodulation reference signal mapping to a physical resource.
6. A method for determining 5G demodulation reference signal allocation is applied to user equipment and comprises the following steps:
receiving data sent by a base station;
judging whether the received data is correct or not;
when the received data is correct, subtracting a first preset value from the counter before change to obtain a changed counter; when the received data is wrong, increasing a second preset value for the counter before change to obtain a changed counter;
when the changed counter meets a conversion condition, reporting an allocation identification value corresponding to the conversion condition to the base station so that the base station determines a demodulation reference signal allocation mode according to the allocation identification value corresponding to the conversion condition, wherein the allocation identification value is positively correlated with the demodulation reference signal density;
when the changed counter meets a conversion condition, reporting the allocation identification value corresponding to the conversion condition to the base station, including:
when the changed counter reaches a first range, reporting a first distribution identification value corresponding to the first range to the base station;
when the changed counter reaches a second range, reporting a second allocation identification value corresponding to the second range to the base station;
when the changed counter reaches a third range, reporting a third distribution identification value corresponding to the third range to the base station;
and when the changed counter reaches a fourth range, reporting a fourth distribution identification value corresponding to the fourth range to the base station.
7. The method of claim 6, wherein the data includes a Cyclic Redundancy Check (CRC);
the determining whether the received data is correct includes:
judging whether the data meet a preset rule or not according to the CRC;
when the data meets the preset rule, determining that the received data is correct;
when the data does not meet the preset rule, determining that the received data is wrong.
8. A device for determining 5G demodulation reference signal allocation, applied to a base station, comprising:
a receiving module, configured to receive an allocation identifier value corresponding to a transition condition, where the allocation identifier value reported by a user equipment includes a first allocation identifier value corresponding to a first range reported to the base station when a changed counter reaches the first range; when the changed counter reaches a second range, reporting to a second allocation identification value corresponding to the second range of the base station; when the changed counter reaches a third range, reporting to a third distribution identification value corresponding to the third range of the base station; when the changed counter reaches a fourth range, reporting to a fourth distribution identification value corresponding to the fourth range of the base station; the changed counter is the data sent by the base station received by the user equipment; judging whether the received data is correct or not; when the received data is correct, subtracting a first preset value from a counter before change to obtain the counter after change; when the received data is wrong, increasing a counter before change by a second preset value to obtain the changed counter; the distribution identification value is positively correlated with the demodulation reference signal density;
and the determining module is used for determining a demodulation reference signal distribution mode corresponding to the distribution identification value reported by the user equipment according to the distribution identification value reported by the user equipment.
9. A device for determining 5G demodulation reference signal allocation, applied to a user equipment, comprising:
the receiving module is used for receiving data sent by the base station;
the judging module is used for judging whether the received data is correct or not;
the conversion module is used for subtracting a first preset value from the counter before change when the received data is correct to obtain the counter after change; when the received data is wrong, increasing a second preset value for the counter before change to obtain a changed counter;
a reporting module, configured to report, when the changed counter meets a transition condition, an allocation identifier value corresponding to the transition condition to the base station, so that the base station determines, according to the allocation identifier value corresponding to the transition condition, a demodulation reference signal allocation manner, where the allocation identifier value is positively correlated to a demodulation reference signal density;
the reporting module is specifically configured to report, to the base station, a first allocation identifier value corresponding to a first range when the changed counter reaches the first range; when the changed counter reaches a second range, reporting a second allocation identification value corresponding to the second range to the base station; when the changed counter reaches a third range, reporting a third distribution identification value corresponding to the third range to the base station; and when the changed counter reaches a fourth range, reporting a fourth distribution identification value corresponding to the fourth range to the base station.
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