CN110113139A - A kind of downlink traffic channel sending method, user terminal and base station - Google Patents
A kind of downlink traffic channel sending method, user terminal and base station Download PDFInfo
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- CN110113139A CN110113139A CN201810103767.5A CN201810103767A CN110113139A CN 110113139 A CN110113139 A CN 110113139A CN 201810103767 A CN201810103767 A CN 201810103767A CN 110113139 A CN110113139 A CN 110113139A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 63
- 238000009432 framing Methods 0.000 claims abstract description 25
- 230000006835 compression Effects 0.000 claims description 107
- 238000007906 compression Methods 0.000 claims description 107
- 238000004590 computer program Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 9
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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Abstract
The embodiment of the present invention provides a kind of downlink traffic channel sending method, user terminal and base station.The method includes receiving the Downlink Control Information sent by base station, wherein the Downlink Control Information includes at least sub-band number, modulating-coding grade, framing number and compressibility factor；Wherein, the compressibility factor is obtained by the base station according to current channel condition；Equivalent sub-band number is obtained according to the sub-band number and compressibility factor；According to the equivalent sub-band number, modulating-coding grade and framing number, the data volume of subsequent transmission is obtained from transport block size table, the embodiment of the present invention in Downlink Control Information by being added compressibility factor, to make the equivalent number of sub-bands that the user terminal obtains, and data volume is further obtained to inquire TBS table by equivalent subband amount, to carry out the parsing of subsequent data-signal, to reduce the demodulation threshold of user terminal, improve detection performance, so as to more efficiently utilize available frequency domain resource, lifting system performance.
Description
Technical Field
The embodiment of the invention relates to the technical field of wireless communication, in particular to a downlink service channel sending method, a user terminal and a base station.
Background
In an existing private network application scenario, frequency domain resources are few, for example, data acquisition of a smart power grid of a power system is performed, when a single sub-band is transmitted, only 20KHz bandwidth and 11 sub-carriers are provided, and when a TB table in an LTE protocol is referred, a PDSCH transmits a large Transport Block (TB) Block when channel conditions are good, and high MCS high-order modulation, such as 16QAM or 64QAM, needs to be selected; throughput can be sacrificed when channel conditions are poor and a low MCS low order modulation, such as QPSK, is selected.
In order to enhance coverage, low-order modulation needs to be adopted under a low signal-to-noise ratio to ensure performance, and sufficient information bits need to be transmitted at the same time, so that under the condition that frequency domain resources are limited, a single sub-band system can realize transmission of downlink service data by increasing time domain resources to which TB blocks can be mapped, that is, one TB block can be mapped to downlink sub-frames of one or more radio frames after being coded and rate-matched. The TB block size, i.e., TBS, of a single subband system is determined according to I in Downlink Control Information (DCI)TBSAnd INFDomain derivation: such as will INFTaking values from 0 to 3, the extended frame number Nf is 1,2,4, and 8 radio frames respectively, and the transmission is completed. I isTBSValues 0 to 7 represent different modulation and coding levels. Then can be formed byTBSAnd INFAnd looking up a two-dimensional TBS table to obtain the TBS value under the current configuration. Because the single subband system is limited by frequency domain resources, even if the single subband system can be mapped to a plurality of radio frames in a time domain, the transmittable information bits still can not completely meet the actual requirements, so that the frequency domain resources are considered to be increased, namely, the multiple subbands are adopted for simultaneous transmission, so that the transmission of downlink service data with larger capacity requirements is realized. A simple multi-sub-band transmission scheme is to keep the same modulation coding grade and corresponding code rate as a single sub-band system, namely, the dimension of increasing the number of sub-bands by the TBS table of the two-dimensional single sub-band is expanded to three dimensions. The scheme is equivalent to that under the condition that the code rate grade is not changed, the number of bits transmitted by each radio frame is increased on a frequency domain, and the bits are mapped to a PDSCH multi-subband range of a user for transmission.
In the above multi-subband transmission scheme, the effect of enlarging the frequency domain resources is only to improve the throughput in the same time. When the transmission condition of the system is deteriorated, even if the modulation coding level is reduced to the lowest level which is the same as that of the single sub-band, only the demodulation threshold similar to that of the single sub-band can be realized, and the detection performance cannot be further improved.
Disclosure of Invention
The embodiment of the invention provides a downlink service channel sending method, a user terminal and a base station, which are used for solving the problem that in the prior art, when the transmission condition of a system is deteriorated, even if the modulation coding level is reduced to the lowest level which is the same as a single sub-band, only a demodulation threshold which is similar to the single sub-band can be realized, and the detection performance cannot be further improved.
In a first aspect, an embodiment of the present invention provides a method for sending a downlink traffic channel, including:
receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a subframe number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition;
obtaining the equivalent sub-band number according to the sub-band number and the compression factor;
and acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
In a second aspect, an embodiment of the present invention provides a method for sending a downlink traffic channel, including:
obtaining a compression factor according to the current channel condition;
sending downlink control information to a user terminal, wherein the downlink control information comprises the number of sub-bands, the modulation coding grade, the number of sub-frames and the compression factor; and then, acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
In a third aspect, an embodiment of the present invention provides a user equipment for downlink traffic channel transmission, including:
a receiving module, configured to receive downlink control information sent by a base station, where the downlink control information at least includes a subband number, a modulation coding level, a subframe number, and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition;
the calculating module is used for obtaining the equivalent subband number according to the subband number and the compression factor;
and the query module is used for acquiring the data volume of subsequent transmission from the transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
In a fourth aspect, an embodiment of the present invention provides a base station for downlink traffic channel transmission, including:
the acquisition module is used for obtaining a compression factor according to the current channel condition;
a sending module, configured to send downlink control information to a user terminal, where the downlink control information includes a subband number, a modulation coding level, a subframe number, and the compression factor; and then, acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
In a fifth aspect, an embodiment of the present invention further provides an electronic device, including:
a processor, a memory, a communication interface, and a bus; wherein,
the processor, the memory and the communication interface complete mutual communication through the bus;
the communication interface is used for information transmission between communication devices of the electronic equipment;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform a method comprising:
receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a subframe number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition;
obtaining the equivalent sub-band number according to the sub-band number and the compression factor;
and acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
In a sixth aspect, an embodiment of the present invention further provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following method:
receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a subframe number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition;
obtaining the equivalent sub-band number according to the sub-band number and the compression factor;
and acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
According to the downlink service channel sending method, the user terminal and the base station provided by the embodiment of the invention, the compression factor is added into the downlink control information, so that the user terminal can obtain the equivalent sub-band quantity according to the compression factor and the sub-band data, and further, the data quantity is obtained by inquiring the TBS table through the equivalent sub-band quantity, so that the subsequent data signal analysis is carried out, the demodulation threshold of the user terminal is reduced, the detection performance is improved, the available frequency domain resource can be more effectively utilized, and the system performance is improved.
Drawings
Fig. 1 is a flowchart of a method for transmitting a downlink traffic channel according to an embodiment of the present invention;
fig. 2 is a flowchart of another downlink traffic channel transmission method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a user terminal for a downlink traffic channel transmission method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station for a downlink traffic channel transmission method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a method for sending a downlink traffic channel according to an embodiment of the present invention, and as shown in fig. 1, the method includes:
step S01, receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a framing number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition.
Before a base station prepares to send data to a user terminal, Downlink Control Information (DCI) is sent to the user terminal to specify related signal Information of a subsequently sent data signal, wherein the DCI at least includes a subband number, a modulation coding level, a subframe number, a compression factor, and the like.
Number of said sub-bandsThe number of subbands occupied by the data signal to be transmitted, e.g., 16. The modulation coding level ITBSModulation and Coding Scheme (MCS) of the data signal can be obtained, and for example, 16QAM or 64QAM can be used for MCS high-order Modulation, and QPSK or the like can be used for MCS low-order Modulation, corresponding to different Modulation schemes. The number of minute frames INFRepresenting how many radio frames it is necessary to complete the transmission of all data signals to be transmitted. The compression factorThe better the channel condition, which is obtained from the current channel condition, theThe smaller the value of (c), the larger the opposite. The current Channel condition is obtained through information interaction between the previous base station and the user equipment, for example, by calculating a Channel State Indicator (CSI).
Further, the compression factor value range is {1,2,4,8,16,32,64,128}, and accordingly, the compression factor value range is represented by a 3-bit compression factor field in the downlink control information.
The value range of the compression factor and the representation mode in the downlink control information DCI may be set according to actual needs, and only one of them is given in the embodiment of the present invention. The value of the compression factor can be selected from {1,2,4,8,16,32,64,128} according to the current channel state, and then the value is respectively represented by a 3-bit compression factor field in DCI.
And step S02, obtaining the equivalent subband number according to the subband number and the compression factor.
After receiving the downlink control information DCI, the user terminal may parse the DCI to obtain the number of subbands thereinModulation coding class ITBSNumber of frames INFAnd compression factorThen according to the number of sub-bandsAnd compression factorThe equivalent subband number can be calculated
Further, obtaining an equivalent subband number according to the subband number and a compression factor; the method specifically comprises the following steps:
the equivalent subband number is obtained by the following formula
Wherein saidIs the number of sub-bands, theIs the compression factor.
The equivalent number of sub-bandsThe calculation method can be set according to actual needs, only one of which is given in the embodiments of the present invention, and the number of subbands is used as an exampleAnd compression factorThe ratio of (A) to (B) yields the number of equivalent subbands
And step S03, acquiring the data volume of the subsequent transmission from the transmission block size table according to the equivalent sub-band number, the modulation coding level and the framing number.
According to the calculated equivalent sub-band number, the data amount contained in the transmission block which is prepared to be sent to the user terminal by the subsequent base station can be obtained from the transmission block size table TBS by combining the modulation coding grade and the framing number. That is, when the user terminal subsequently receives the data signal transmitted from the base station, the user terminal can know the data amount obtained by analyzing the data signal in advance.
For example to orderITBS＝3，INF＝1，The equivalent number of subbands of the data volume is obtainedAccording to the number of the sub-bands to be validated 4, ITBS3 and INFLooking up the multi-subband TBS table for 1, the corresponding TBS value, i.e. the amount of data, can be obtained. It can be known thatThe corresponding data volume is actually transmitted in 16 sub-bands instead of 4 sub-bands used for inquiry, so that the same data volume is transmitted in a determined time domain by using more frequency domain resources, the code rate can be reduced, the demodulation threshold of the user terminal is reduced, and the data in the data signal can be analyzed from a poor channel state more easily.
According to the embodiment of the invention, the compression factor is added into the downlink control information, so that the user terminal can obtain the equivalent sub-band quantity according to the compression factor and the sub-band data, and further query the TBS table to obtain the data quantity through the equivalent sub-band quantity to analyze the subsequent data signals, thereby reducing the demodulation threshold of the user terminal, improving the detection performance, more effectively utilizing the available frequency domain resources and improving the system performance.
Based on the above embodiment, further, after the step S03, the method further includes:
receiving a downlink data signal transmitted by a base station;
and analyzing the downlink data signal according to the data volume, the number of sub-bands, the modulation coding level and the number of sub-frames.
After confirming that the user terminal receives the downlink control information, the base station sends a data signal to the user terminal according to the number of the sub-bands, the modulation coding level and the number of the sub-frames, wherein the size of a transmission block corresponding to the data signal is the same as the data volume inquired by the TBS table in the embodiment.
After receiving the data signal, the user terminal analyzes the downlink data signal by adopting a corresponding decoding and demodulation mode according to the information such as the data volume, the number of sub-bands, the modulation coding standby group, the number of sub-frames and the like, thereby obtaining the data transmitted by the base station.
According to the embodiment of the invention, the compression factor is added into the downlink control information, so that the user terminal can obtain the equivalent sub-band quantity according to the compression factor and the sub-band data, and further query the TBS table to obtain the data quantity through the equivalent sub-band quantity to analyze the subsequent data signals, thereby reducing the demodulation threshold of the user terminal, improving the detection performance, more effectively utilizing the available frequency domain resources and improving the system performance.
Fig. 2 is a flowchart of another downlink traffic channel transmission method according to an embodiment of the present invention, and as shown in fig. 2, the method includes:
and step S05, obtaining a compression factor according to the current channel condition.
Before the base station prepares to send data to the user terminal, the compression factor is obtained through the obtained current channel stateThe better the channel conditions, theThe smaller the value of (c), the larger the opposite. The current channel condition is obtained through information interaction between the previous base station and the user equipment, for example, by calculating a Channel State Indicator (CSI).
Further, the compression factor value range is {1,2,4,8,16,32,64,128}, and accordingly, the compression factor value range is represented by a 3-bit compression factor field in the downlink control information.
The value range of the compression factor and the representation mode in the downlink control information DCI may be set according to actual needs, and only one of them is given in the embodiment of the present invention. The value of the compression factor can be selected from {1,2,4,8,16,32,64,128} according to the current channel state, and then the value is respectively represented by a 3-bit compression factor field in DCI.
Step S06, sending downlink control information to user terminal, wherein the downlink control information comprises sub-band number, modulation coding grade, sub-frame number and compression factor; and then, acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
After obtaining the compression factor, the base station sends downlink control information DCI to the user terminal to agree on the related signal information of the subsequently sent data signal, where the DCI at least includes the number of subbands, modulation coding level, number of subframes, compression factor, and the like.
After receiving the downlink control information DCI, the user terminal may parse the DCI to obtain the number of subbands thereinModulation coding class ITBSNumber of frames INFAnd compression factorThen according to the number of sub-bandsAnd compression factorThe equivalent subband number can be calculated
Further, obtaining an equivalent subband number according to the subband number and a compression factor; the method specifically comprises the following steps:
the equivalent subband number is obtained by the following formula
Wherein saidIs the number of sub-bands, theIs the compression factor.
The equivalent number of sub-bandsThe calculation method can be set according to actual needs, only one of which is given in the embodiments of the present invention, and the number of subbands is used as an exampleAnd compression factorThe ratio of (A) to (B) yields the number of equivalent subbands
According to the calculated equivalent sub-band number, the data amount contained in the transmission block which is prepared to be sent to the user terminal by the subsequent base station can be obtained from the transmission block size table TBS by combining the modulation coding grade and the framing number. That is, when the user terminal subsequently receives the data signal transmitted from the base station, the user terminal can know the data amount obtained by analyzing the data signal in advance.
According to the embodiment of the invention, the compression factor is added into the downlink control information, so that the user terminal can obtain the equivalent sub-band quantity according to the compression factor and the sub-band data, and further query the TBS table to obtain the data quantity through the equivalent sub-band quantity to analyze the subsequent data signals, thereby reducing the demodulation threshold of the user terminal, improving the detection performance, more effectively utilizing the available frequency domain resources and improving the system performance.
Fig. 3 is a schematic structural diagram of a user terminal for a downlink traffic channel transmission method according to an embodiment of the present invention, where as shown in fig. 3, the user terminal includes: the system comprises a receiving module 10, a calculating module 11 and a query module 12; wherein,
the receiving module 10 is configured to receive downlink control information sent by a base station, where the downlink control information at least includes a subband number, a modulation coding level, a subframe number, and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition; the calculating module 11 is configured to obtain an equivalent subband number according to the subband number and the compression factor; the query module 12 is configured to obtain the data size of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level, and the framing number. Specifically, the method comprises the following steps:
before the base station prepares to send data to the receiving module 10, downlink control information DCI is sent to the receiving module 10 to stipulate the related signal information of the subsequently sent data signal, where the DCI at least includes a subband number, a modulation coding level, a subframe number, a compression factor, and the like. The compression factorThe better the channel condition, obtained from the current channel condition, theThe smaller the value of (c), the larger the opposite. The current channel condition is obtained through information interaction between the previous base station and the user terminal, for example, by calculating the channel state indicator CSI.
Further, the compression factor value range is {1,2,4,8,16,32,64,128}, and accordingly, the compression factor value range is represented by a 3-bit compression factor field in the downlink control information.
The value range of the compression factor and the representation mode in the downlink control information DCI may be set according to actual needs, and only one of them is given in the embodiment of the present invention. The value of the compression factor can be selected from {1,2,4,8,16,32,64,128} according to the current channel state, and then the value is respectively represented by a 3-bit compression factor field in DCI.
After receiving the downlink control information DCI, the receiving module 10 may analyze the DCI to obtain the number of subbands thereinModulation coding class ITBSNumber of frames INFAnd compression factorThen the number of sub-bandsAnd compression factorSending the equivalent subband number to the calculating module 11 for calculationMeanwhile, the receiving module 10 sends the modulation coding level and the framing number to the querying module 12.
Further, obtaining an equivalent subband number according to the subband number and a compression factor; the method specifically comprises the following steps:
the equivalent subband number is obtained by the following formula
Wherein saidIs the number of sub-bands, theIs the compression factor.
The equivalent number of sub-bandsThe calculation method can be set according to actual needs, only one of which is given in the embodiments of the present invention, and the number of subbands is used as an exampleAnd compression factorThe ratio of (A) to (B) yields the number of equivalent subbands
The calculating module 11 sends the calculated equivalent sub-band number to the querying module 12, and the querying module 12, in combination with the received modulation coding level and the framing number, may obtain, from the transport block size table TBS, the data size contained in the transport block that the subsequent base station is ready to send to the user terminal. That is, when the user terminal subsequently receives the data signal transmitted from the base station, the user terminal can know the data amount obtained by analyzing the data signal in advance.
For example to orderITBS＝3，INF＝1，The equivalent number of subbands of the data volume is obtainedAccording to the number of the sub-bands to be validated 4, ITBS3 and INFLooking up the multi-subband TBS table for 1, the corresponding TBS value, i.e. the amount of data, can be obtained. It can be known that the corresponding data amount is actually transmitted in 16 sub-bands instead of 4 sub-bands used for inquiry, so that more frequency domain resources are used for transmitting the same data amount in a determined time domain, the code rate can be reduced, the demodulation threshold of the user terminal is reduced, and the data in the data signal can be analyzed from a poor channel state more easily.
The apparatus provided in the embodiment of the present invention is configured to execute the method, and the functions of the apparatus refer to the method embodiment specifically, and detailed method flows thereof are not described herein again.
In the embodiment of the present invention, the compression factor is added to the downlink control information, so that the calculation module 11 can obtain the equivalent sub-band quantity according to the compression factor and the sub-band data, and further the query module 12 queries the TBS table to obtain the data quantity through the equivalent sub-band quantity to perform subsequent data signal analysis, thereby reducing the demodulation threshold, improving the detection performance, and thus, more effectively utilizing the available frequency domain resources and improving the system performance.
Fig. 4 is a schematic structural diagram of a base station for a downlink traffic channel transmission method according to an embodiment of the present invention, and as shown in fig. 4, the base station includes: an acquisition module 20 and a sending module 21; wherein,
the obtaining module 20 is configured to obtain a compression factor according to a current channel condition; the sending module 21 is configured to send downlink control information to the user terminal, where the downlink control information includes a subband number, a modulation coding level, a subframe number, and the compression factor; and then, acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number. Specifically, the method comprises the following steps:
before the sending module 21 prepares to send data to the user terminal, the obtaining module 20 will obtain the compression factor according to the obtained current channel stateThe better the channel conditions, theThe smaller the value of (c), the larger the opposite. The current Channel condition is obtained through information interaction between the previous base station and the user equipment, for example, by calculating a Channel State Indicator (CSI).
After obtaining the compression factor sent by the obtaining module 20, the sending module 21 sends Downlink Control Information (DCI) to the user equipment to specify related signal Information of a subsequently sent data signal, where the DCI at least includes a subband number, a modulation coding level, a subframe number, a compression factor, and the like.
After receiving the downlink control information DCI, the user terminal may parse the DCI to obtain the number of subbands thereinModulation coding class ITBSNumber of frames INFAnd compression factorThen according to the number of sub-bandsAnd compression factorThe equivalent subband number can be calculated
According to the calculated equivalent sub-band number, the data amount contained in the transmission block which is prepared to be sent to the user terminal by the subsequent base station can be obtained from the transmission block size table TBS by combining the modulation coding grade and the framing number. That is, when the user terminal subsequently receives the data signal transmitted from the base station, the user terminal can know the data amount obtained by analyzing the data signal in advance.
The apparatus provided in the embodiment of the present invention is configured to execute the method, and the functions of the apparatus refer to the method embodiment specifically, and detailed method flows thereof are not described herein again.
According to the embodiment of the invention, the compression factor is added into the downlink control information, so that the user terminal can obtain the equivalent sub-band quantity according to the compression factor and the sub-band data, and further query the TBS table to obtain the data quantity through the equivalent sub-band quantity to analyze the subsequent data signals, thereby reducing the demodulation threshold of the user terminal, improving the detection performance, more effectively utilizing the available frequency domain resources and improving the system performance.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the invention. As shown in fig. 5, the electronic device includes: a processor (processor)601, a memory (memory)602, and a bus 603;
wherein, the processor 601 and the memory 602 complete the communication with each other through the bus 603;
the processor 601 is configured to call program instructions in the memory 602 to perform the methods provided by the above-mentioned method embodiments, for example, including: receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a subframe number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition; obtaining the equivalent sub-band number according to the sub-band number and the compression factor; and acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
Further, embodiments of the present invention disclose a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, which when executed by a computer, the computer is capable of performing the methods provided by the above-mentioned method embodiments, for example, comprising: receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a subframe number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition; obtaining the equivalent sub-band number according to the sub-band number and the compression factor; and acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
Further, an embodiment of the present invention provides a non-transitory computer-readable storage medium storing computer instructions, which cause the computer to perform the method provided by the above method embodiments, for example, including: receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a subframe number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition; obtaining the equivalent sub-band number according to the sub-band number and the compression factor; and acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the electronic device and the like are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for sending downlink traffic channels, comprising:
receiving downlink control information sent by a base station, wherein the downlink control information at least comprises a subband number, a modulation coding grade, a subframe number and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition;
obtaining the equivalent sub-band number according to the sub-band number and the compression factor;
and acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
2. The method according to claim 1, wherein said deriving an equivalent subband number according to said subband number and a compression factor; the method specifically comprises the following steps:
the equivalent subband number is obtained by the following formula
Wherein saidIs the number of sub-bands, theIs the compression factor.
3. The method of claim 1, further comprising:
receiving a downlink data signal transmitted by a base station;
and analyzing the downlink data signal according to the data volume, the number of sub-bands, the modulation coding level and the number of sub-frames.
4. The method of claim 1, wherein the compression factor has a value range of {1,2,4,8,16,32,64,128}, and is correspondingly represented by a 3-bit compression factor field in the downlink control information.
5. A method for sending downlink traffic channels, comprising:
obtaining a compression factor according to the current channel condition;
sending downlink control information to a user terminal, wherein the downlink control information comprises the number of sub-bands, the modulation coding grade, the number of sub-frames and the compression factor; and then, acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
6. A user terminal for downlink traffic channel transmission, comprising:
a receiving module, configured to receive downlink control information sent by a base station, where the downlink control information at least includes a subband number, a modulation coding level, a subframe number, and a compression factor; wherein the compression factor is obtained by the base station according to the current channel condition;
the calculating module is used for obtaining the equivalent subband number according to the subband number and the compression factor;
and the query module is used for acquiring the data volume of subsequent transmission from the transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
7. Based on the foregoing embodiment, further, the calculating module is specifically configured to obtain the equivalent subband number according to the following formula
Wherein saidIs the number of sub-bands, theIs the compression factor.
8. A base station for downlink traffic channel transmission, comprising:
the acquisition module is used for obtaining a compression factor according to the current channel condition;
a sending module, configured to send downlink control information to a user terminal, where the downlink control information includes a subband number, a modulation coding level, a subframe number, and the compression factor; and then, acquiring the data volume of subsequent transmission from a transmission block size table according to the equivalent subband number, the modulation coding level and the framing number.
9. An electronic device, comprising a memory and a processor, wherein the processor and the memory communicate with each other via a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 5.
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