CN110167182B - Method for determining uplink code rate and base station - Google Patents
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- CN110167182B CN110167182B CN201810147105.8A CN201810147105A CN110167182B CN 110167182 B CN110167182 B CN 110167182B CN 201810147105 A CN201810147105 A CN 201810147105A CN 110167182 B CN110167182 B CN 110167182B
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Abstract
The invention discloses a method for determining an uplink code rate and a base station, wherein the method comprises the following steps: when terminal equipment needs to send uplink information, a base station determines first scheduling information configured for the terminal equipment according to the use condition of air interface resources at the current moment and the size of the uplink information; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information; the base station determines a first transmission code rate when the terminal equipment transmits the uplink information according to the first scheduling information and the uplink information; when the first transmission code rate is smaller than a preset threshold value, the base station determines the code rate of each code block in the N code blocks; and when the code rate of any one of the N code blocks is higher than the preset threshold value, the base station adjusts the first scheduling information into second scheduling information.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for determining an uplink code rate and a base station.
Background
In a wireless communication system, for example, a Long Term Evolution (LTE) system or a New Radio (NR) system, to ensure reliability of data transmission, it is generally necessary to control a code rate of a transmitted data block to be equal to or less than a maximum code rate that can be tolerated by a transmission Channel, for example, in the LTE system, it is necessary to control a code rate of an entire data block transmitted in a Physical Downlink Shared Channel (PDSCH) to be equal to or less than 0.930; in a Physical Uplink Shared Channel (PUSCH), a code rate of an entire data block is generally set to not more than 1.
And the determination of the code rate is typically done by a base station in the wireless communication system. For example, in the prior art, when a terminal device needs to send uplink information to a base station, the base station first needs to determine, according to information such as data volume and spectrum efficiency of the terminal device in a current cell, scheduling information such as air interface resources that can be allocated by the terminal device, Modulation and Coding Scheme (MCS) level and Physical Resource Block (PRB) corresponding to the Modulation and Coding Scheme (MCS) level, and then determines, according to the scheduling information, whether a code rate of a corresponding whole data Block when the terminal device transmits the uplink information exceeds a maximum code rate that can be allowed by a transmission channel, and if so, performs code rate reduction processing on the scheduling information to ensure that the code rate of the whole data Block determined by the terminal device according to the adjusted scheduling information is less than or equal to the maximum code rate that can be allowed by the transmission channel, and determines that a code rate that does not exceed the capacity of a PUSCH channel is allocated to the terminal device, as shown in fig. 1.
However, since the PUSCH channel may carry information such as CQI/PMI, RI, HARQ-ACK, etc., which may affect a code rate of a certain code block in the data block, for example, a certain data block to be transmitted is totally divided into 4 code blocks, HARQ-ACK information may be carried in each code block of the data block in a puncturing manner, for example, HARQ-ACK information occupies 2 symbols in a first code block and occupies 1 symbol in a second code block, thereby causing different code rates of the 4 code blocks, for example, the code rate of the first code block is higher than that of other code blocks, so that there is a case that the overall transmission block code rate of the data block to be transmitted meets the requirement, but the code rate of the certain code block of the transmission data block may exceed a reasonable range, so that the base station may decode the certain code block incorrectly, thereby causing incorrect decoding of the entire transmission data block, resulting in poor uplink decoding performance of the base station.
Disclosure of Invention
The invention provides a method for determining an uplink code rate and a base station, which are used for solving the technical problem of poor uplink decoding performance of the base station in the prior art.
A first aspect of the present invention provides a method for determining an uplink code rate, where the method includes:
when terminal equipment needs to send uplink information, a base station determines first scheduling information configured for the terminal equipment according to the use condition of air interface resources at the current moment and the size of the uplink information; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information;
the base station determines a first transmission code rate when the terminal equipment transmits the uplink information according to the first scheduling information and the uplink information;
when the first transmission code rate is smaller than a preset threshold value, the base station determines the code rate of each code block in the N code blocks; when the terminal device transmits the uplink information, the terminal device divides the uplink information into the N code blocks for transmission, wherein N is a positive integer;
when the code rate of any one of the N code blocks is higher than the preset threshold value, the base station adjusts the first scheduling information into second scheduling information; and when the terminal equipment transmits the uplink information by using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold value.
In a possible embodiment, the determining, by the base station, a code rate for each of the N code blocks includes:
the base station determines whether the uplink information contains control information; the control information comprises any one or more of Channel Quality Indication (CQI) information, Rank Indication (RI) information, Precoding Matrix Indication (PMI) information and hybrid automatic repeat request acknowledgement (HARQ-ACK) information;
and when the uplink information is determined to contain the control information, the base station triggers the base station to determine the code rate of each code block.
In a possible embodiment, the determining, by the base station, the code rate of each code block includes:
the base station determines the bit number occupied by the control information in each code block;
the base station determines the code rate of each code block as the ratio of the bit number of the uplink data contained in the code block to a first difference value; the first difference is the difference between the number of bits obtained after the code block is subjected to channel coding and rate matching and the number of bits occupied by the control information in the code block.
In a possible embodiment, the determining, by the base station, the number of bits occupied by the control information in each code block includes:
the base station determines whether the number of subcarriers occupied by the control information is larger than the number of subcarriers occupied by the last code block in the N code blocks; the subcarriers occupied by the control information and the subcarriers occupied by the last code block respectively comprise one or more of the target air interface resources, and the N code blocks are divided from low to high according to the frequency domain information of the target air interface resources;
if not, the base station determines that the bit number occupied by the control information in the last code block is the total bit number of the control information, and determines that the bit number occupied by the control information in the first code block is zero; wherein the first code block is a code block of the N code blocks except for the last code block.
In a possible embodiment, after the base station determines whether the number of subcarriers occupied by the control information is greater than the number of subcarriers occupied by the last code block, the method further includes:
if so, the base station determines that the bit number occupied by the control information in the last code block is a product of a first bit number that can be borne by each resource element RE, the number of subcarriers occupied by the last code block, and the bit number of the control information that can be borne by any one subcarrier in the subcarriers occupied by the last code block;
the base station updates the number of the sub-carriers occupied by the control information to obtain the updated number of the sub-carriers; wherein the updated number of subcarriers is a difference value between the number of subcarriers occupied by the control information and the number of subcarriers occupied by the last code block;
when the number of the updated subcarriers is larger than a preset threshold, the base station determines whether the number of the updated subcarriers is larger than the number of subcarriers occupied by the penultimate code block;
when the number of the updated subcarriers is smaller than the number of subcarriers occupied by the penultimate code block, the base station determines that the bit number occupied by the control information in the penultimate code block is a difference value of the total bit number of the control information minus the bit number occupied by the control information in the last code block, and determines that the bit number occupied by the control information in the second code block is zero; the second code block is a code block of the N code blocks except for the last code block and the penultimate code block.
A second aspect of the present invention provides a base station, including:
a first determining module, configured to determine, when a terminal device needs to send uplink information, first scheduling information configured for the terminal device according to a use condition of an air interface resource at a current time and a size of the uplink information; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information;
a second determining module, configured to determine, according to the first scheduling information and the uplink information, a first transmission code rate when the terminal device transmits the uplink information;
a third determining module, configured to determine a code rate of each of the N code blocks when the first transmission code rate is smaller than a preset threshold; when the terminal device transmits the uplink information, the terminal device divides the uplink information into the N code blocks for transmission, wherein N is a positive integer;
an adjusting module, configured to adjust the first scheduling information to be second scheduling information when a code rate of any one of the N code blocks is higher than the preset threshold; and when the terminal equipment transmits the uplink information by using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold value.
In a possible implementation manner, the third determining module is specifically configured to:
determining whether the uplink information contains control information; the control information comprises any one or more of Channel Quality Indication (CQI) information, Rank Indication (RI) information, Precoding Matrix Indication (PMI) information and hybrid automatic repeat request acknowledgement (HARQ-ACK) information;
and triggering the self to determine the code rate of each code block when the uplink information is determined to contain the control information.
In a possible implementation manner, the third determining module is specifically configured to:
determining the number of bits occupied by the control information in each code block;
determining the code rate of each code block as the ratio of the bit number of the uplink data contained in the code block to a first difference value; the first difference is the difference between the number of bits obtained after the code block is subjected to channel coding and rate matching and the number of bits occupied by the control information in the code block.
In a possible implementation manner, the third determining module is specifically configured to:
determining whether the number of subcarriers occupied by the control information is greater than the number of subcarriers occupied by the last code block in the N code blocks; the subcarriers occupied by the control information and the subcarriers occupied by the last code block respectively comprise one or more of the target air interface resources, and the N code blocks are divided from low to high according to the frequency domain information of the target air interface resources;
if not, determining that the bit number occupied by the control information in the last code block is the total bit number of the control information, and determining that the bit number occupied by the control information in the first code block is zero; wherein the first code block is a code block of the N code blocks except for the last code block.
In a possible embodiment, the third determining module is further configured to:
if so, determining that the bit number occupied by the control information in the last code block is a product of a first bit number that can be borne by each Resource Element (RE), the number of subcarriers occupied by the last code block, and the bit number of the control information that can be borne by any one subcarrier in the subcarriers occupied by the last code block;
updating the number of the sub-carriers occupied by the control information to obtain the updated number of the sub-carriers; wherein the updated number of subcarriers is a difference value between the number of subcarriers occupied by the control information and the number of subcarriers occupied by the last code block;
when the number of the updated subcarriers is larger than a preset threshold, determining whether the number of the updated subcarriers is larger than the number of subcarriers occupied by the penultimate code block;
when the number of the updated subcarriers is smaller than the number of subcarriers occupied by the penultimate code block, determining that the bit number occupied by the control information in the penultimate code block is a difference value obtained by subtracting the bit number occupied by the control information in the last code block from the total bit number of the control information, and determining that the bit number occupied by the control information in the second code block is zero by the base station; the second code block is a code block of the N code blocks except for the last code block and the penultimate code block.
The third aspect of the present invention provides a base station, comprising a processor, a transmitter and a receiver, wherein the receiver and the transmitter receive and transmit data under the control of the processor, the base station further comprises a memory, a preset program is stored in the memory, the processor reads the program in the memory, and the following processes are executed according to the program:
the processor is configured to determine first scheduling information configured for the terminal device according to a use condition of an air interface resource at a current time and a size of the uplink information when determining that the terminal device needs to send the uplink information according to the information received by the receiver; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information;
the processor is further configured to determine a first transmission code rate of the terminal device when transmitting the uplink information according to the first scheduling information and the uplink information;
the processor is further configured to determine a code rate for each of the N code blocks when the first transmission code rate is less than a preset threshold; when the terminal device transmits the uplink information, the terminal device divides the uplink information into the N code blocks for transmission, wherein N is a positive integer;
the processor is further configured to adjust the first scheduling information to second scheduling information when a code rate of any one of the N code blocks is higher than the preset threshold; and when the transmitter sends the second scheduling information to the terminal equipment under the control of the processor, and the terminal equipment transmits the uplink information by using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold.
A fourth aspect of the present invention provides a computer apparatus, comprising:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of any one of the first aspect using the communication interface by executing the instructions stored by the memory.
A fifth aspect of the present invention provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions which, when run on a computer, cause the computer to perform the method according to any of the first aspects.
The technical scheme in the embodiment of the invention has the following beneficial effects:
when a base station determines that terminal equipment needs to send uplink information, the base station firstly configures first scheduling information for sending the uplink information for the terminal equipment according to the current remaining air interface resources and the size of the uplink information, then determines a code rate when the terminal equipment uses the first scheduling information to transmit the uplink information, determines whether the code rate meets requirements, namely whether the code rate is smaller than a preset threshold value, because the terminal equipment is divided into a plurality of code blocks to transmit when transmitting the uplink information, when the code rate meets the requirements, the base station further determines the code rate of each code block when the terminal equipment transmits the uplink information by using the first scheduling information, if the code rate of a certain code block does not meet the requirements, namely the code rate of the certain code block is higher than the preset threshold value, the base station performs code rate reduction processing, and adjusts the scheduling information configured for the terminal equipment to a second scheduling information with the code rate lower than the first scheduling information, and when the terminal equipment transmits the uplink information, the code rate corresponding to the second scheduling information can ensure that the code rate of each code block is lower than the preset threshold. Therefore, when the base station carries out uplink scheduling, the condition of the whole code rate when the terminal equipment transmits uplink information is considered, and whether the code rate of the code block meets the requirement of channel transmission is also considered, so that the scheduled air interface resource can meet the requirement of channel transmission, the condition that the whole transmission code block is incorrectly decoded due to incorrect decoding of a certain code block is avoided, and the uplink decoding performance is improved.
Drawings
Fig. 1 is a flowchart of a method for determining an uplink code rate in the prior art;
fig. 2 is a flowchart of a method for determining an uplink code rate according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating multiplexing effects of control information according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for determining control information included in each code block according to an embodiment of the present invention;
fig. 5 is a flowchart of a specific example of a method for determining an uplink code rate in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 7 is another schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
The invention provides a method for determining an uplink code rate and a base station, which are used for solving the technical problem of poor uplink decoding performance of the base station in the prior art.
In order to solve the technical problems, the general idea of the invention is as follows:
when a base station determines that terminal equipment needs to send uplink information, the base station firstly configures first scheduling information for sending the uplink information for the terminal equipment according to the current remaining air interface resources and the size of the uplink information, then determines a code rate when the terminal equipment uses the first scheduling information to transmit the uplink information, determines whether the code rate meets requirements, namely whether the code rate is smaller than a preset threshold value, because the terminal equipment is divided into a plurality of code blocks to transmit when transmitting the uplink information, when the code rate meets the requirements, the base station further determines the code rate of each code block when the terminal equipment transmits the uplink information by using the first scheduling information, if the code rate of a certain code block does not meet the requirements, namely the code rate of the certain code block is higher than the preset threshold value, the base station performs code rate reduction processing, and adjusts the scheduling information configured for the terminal equipment to a second scheduling information with the code rate lower than the first scheduling information, and when the terminal equipment transmits the uplink information, the code rate corresponding to the second scheduling information can ensure that the code rate of each code block is lower than the preset threshold. Therefore, when the base station carries out uplink scheduling, the condition of the whole code rate when the terminal equipment transmits uplink information is considered, and whether the code rate of the code block meets the requirement of channel transmission is also considered, so that the scheduled air interface resource can meet the requirement of channel transmission, the condition that the whole transmission code block is incorrectly decoded due to incorrect decoding of a certain code block is avoided, and the uplink decoding performance is improved.
In order to better understand the technical solutions of the present invention, the following detailed descriptions of the technical solutions of the present invention are provided with the accompanying drawings and the specific embodiments, and it should be understood that the specific features of the embodiments and the examples of the present invention are the detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features of the embodiments and the examples of the present invention can be combined with each other without conflict.
In the embodiment of the present invention, the base station may be a base station in a wireless communication system such as an LTE system and an NR system, for example, a macro base station, a home base station, or the like, and may also be a relay device or other devices that can communicate with a terminal device through one or more cells over an air interface in an access network; the terminal device may specifically be an electronic device capable of communicating with the base station, such as a mobile phone and a tablet computer, which is not limited in the embodiment of the present invention.
Please refer to fig. 2, which is a flowchart of a method for determining an uplink bit rate according to the present invention, the method includes:
step 201: when the terminal equipment needs to send uplink information, the base station determines first scheduling information configured for the terminal equipment according to the use condition of air interface resources at the current moment and the size of the uplink information.
In this embodiment of the present invention, the first scheduling information is used to indicate a target air interface resource, a coding mode, and a modulation and coding strategy MCS level used by the terminal device to send the uplink information.
In a specific implementation process, when a terminal device needs to send uplink information, it first needs to send Scheduling Request (SR) information to a base station, and then, after receiving the SR information, the base station responds to the SR information, allocates a resource for sending a Buffer Status Report (BSR) to the terminal device, and indicates the resource to the terminal device. After receiving the indication information, the terminal device sends BSR information according to the indicated resources, where the BSR information includes the size of uplink information that the terminal device needs to upload, and after receiving the BSR information, the base station determines the size of the uplink information that the terminal device needs to send, then determines air interface resources that the terminal device can allocate according to the current air interface resource usage, the size of the uplink information, the spectrum efficiency, and other information, and determines a reasonable Transport Block size, coding scheme, MCS level, and corresponding PRB information, i.e., first scheduling information, according to the corresponding relationship among MCS, Transport Block size (Transport Block size), and PRB corresponding to the Transport Block size in the LTE protocol 36.213.
After performing the completion step 201, the method in the embodiment of the present invention performs step 202, that is: and the base station determines a first transmission code rate when the terminal equipment transmits the uplink information according to the first scheduling information and the uplink information.
In a specific implementation process, after the base station determines the first scheduling information configured for the terminal device, it needs to determine a code rate of a transmission block corresponding to the terminal device when the terminal device transmits uplink information by using the first scheduling information. For example, it is determined that uplink information of a terminal device needs to be divided into transmission blocks for transmission, and then the length of one of the transmission blocks, that is, the number of bits included in the transmission block, and the length of the finally output bits of the transmission block after channel coding and rate matching are determined, so as to obtain the code rate of the transmission block, that is:
the code rate of the transport block is the number of bits contained in the transport block/the length of the bits finally output after the transport block is subjected to channel coding and rate matching.
The code rate of the transport block is the first transmission code rate corresponding to the first scheduling information.
Specifically, assuming that a transmission block corresponding to the uplink information is segmented by code blocks and added with CRC check to obtain C code blocks, the bit length of each code block is Er, and the bit length of each code block finally output after channel coding and rate matching is Er, where r is 0.
After performing the completion step 202, the method in the embodiment of the present invention performs step 203, that is: and when the first transmission code rate is smaller than a preset threshold value, the base station determines the code rate of each code block in the N code blocks.
In a specific implementation process, after the base station determines that the terminal device transmits the first transmission code rate corresponding to the uplink information by using the first scheduling information, it is determined whether the first transmission code rate meets the condition of error-free transmission, for example, whether the first transmission code rate is less than or equal to 1, and if the first transmission code rate is not greater than 1, the base station further determines the code rate of each code block when the terminal device transmits the uplink information by using the first scheduling information. Since the terminal device divides the uplink information into a plurality of code blocks, for example, N code blocks, for transmission when transmitting the uplink information, the base station needs to determine whether the code rate of the code block when the terminal device transmits the uplink information satisfies the error-free transmission condition after determining that the code rate of the transmission block of the terminal device satisfies the error-free transmission condition.
It should be noted that, if the base station determines that the first transmission code rate corresponding to the uplink information transmitted by the terminal device using the first scheduling information does not satisfy the condition of error-free transmission, the base station needs to perform code rate reduction processing on the first scheduling information, where the process of code rate reduction processing is as follows: the base station redistributes the scheduling information for the terminal equipment, and the redistributed scheduling information meets the following conditions: when the terminal equipment uses the redistributed scheduling information to transmit the uplink information, the code rate of a corresponding transmission block is smaller than a first transmission code rate, then the base station adopts the same method to determine whether the code rate of the corresponding transmission block when the terminal equipment uses the redistributed scheduling information to transmit the uplink information meets the condition of error-free transmission, and if so, the redistributed scheduling information is used as the first scheduling information; if not, the newly distributed scheduling information is processed with code rate reduction again until the code rate of the transmission block of the scheduling information meets the condition of error-free transmission.
When the uplink information that the terminal device needs to upload includes control information, for example, the uplink information includes any one or more of channel quality indicator CQI information, rank indicator RI information, precoding matrix indicator PMI information, and hybrid automatic repeat request acknowledgement HARQ-ACK information, according to the description of the LTE protocol 36.212, multiplexing and mapping of data information and control information in the uplink physical channel resources in the LTE system actually follows the following sequence:
(1) mapping CQI/PMI information according to the sequence of time domain and frequency domain resource indexes from low to high;
(2) then mapping the data information according to the sequence of the time domain and frequency domain resource indexes from low to high, and skipping the position of RI information when mapping the data information;
(3) the RI information is mapped at the reserved RI information position according to the rule that the frequency domain index is from high to low and the time domain index occupies four symbol positions;
(4) and finally, mapping the HARQ-ACK information, namely, covering the mapped data information by using a rule that the frequency domain index is from high to low and the time domain index occupies four symbol positions.
The final multiplexing mapping effect of the above process is shown in fig. 3. It can be seen from the above mapping multiplexing rule that the data information is mapped one by one from low to high according to the frequency domain index, and after the data information is subjected to code block segmentation, coding, rate matching and concatenation, each code block is equivalently mapped one by one from low to high according to the frequency domain index in sequence of the code block; the control information is mapped one by one from high to low according to the frequency domain index, and the number of information bits is generally much smaller than the size of the transmission data block, so that the situation that the control information covers the data information only occurs on the next code block or the next code blocks, that is, the puncturing effect of the control information on the data information is only effective on the next code blocks. Due to the existence of the puncturing effect, the code rates of each code block and the whole transmission data block, namely the first transmission code rate, have certain difference. Therefore, in the embodiment of the present invention, the specific implementation manner of step 203 is:
the base station determines whether the uplink information contains control information; the control information comprises any one or more of Channel Quality Indication (CQI) information, Rank Indication (RI) information, Precoding Matrix Indication (PMI) information and hybrid automatic repeat request acknowledgement (HARQ-ACK) information;
and when the uplink information is determined to contain the control information, the base station triggers the base station to determine the code rate of each code block.
When the base station determines that the uplink information uploaded by the terminal equipment contains the control information, the code rate of each code block is determined when the terminal equipment transmits the uplink information.
In this embodiment of the present invention, the determining, by the base station, the code rate of each code block includes:
the base station determines the bit number occupied by the control information in each code block;
the base station determines the code rate of each code block as the ratio of the bit number of the uplink data contained in the code block to a first difference value; the first difference is the difference between the number of bits obtained after the code block is subjected to channel coding and rate matching and the number of bits occupied by the control information in the code block.
In the specific implementation process, the control information is taken as HARQ-ACK information for example. As shown in fig. 3, the puncturing effect of the HARQ-ACK information for each code block is different, so that the code rate for each code block may be different, where the code rate for each code block is:
wherein QACKrR is 0, C-1 for the resource bit length occupied by HARQ-ACK information in the code block, and when i, j belongs to {0,., C-1}, i ≠ j, there is Ri≠Rj。
It should be noted here that even when there is no HARQ-ACK information, the code rate for each code block may be different because Kr and Er may be different for each code block, but the code rate for each code block may be considered to be approximately equal because the values of Kr and Er for each code block are not very different, and for simplicity of description, the code block for each code block may be considered to be equal when there is no HARQ-ACK information.
Suppose that the total resource bit length occupied by the HARQ-ACK information is QACKSince the mapping of the HARQ-ACK information covers the data information, that is, the data information is punctured, the code rate of the transmission data block needs to be corrected at this time, and the corrected code rate is:
from the calculation of code block segmentation in the LTE protocol 36.212, the following equation generally holds:
K0≤K1≤…≤KC-1 (4)
according to the calculation of rate matching in the LTE protocol 36.212, the following equation holds:
wherein N isLNumber of layers, Q, mapped for one transport blockmFor the bit number that a single Resource Element (RE) can carry under different modulation modes, when the modulation mode is QPSK, QmWhen the modulation scheme is 16QAM, Q is 2mWhen the modulation mode is 64QAM, Q is 4m6, wherein γ ═ G/(N)L·Qm) Mod C is the total number of allocable resources for the transport block, where 0. ltoreq. gamma. ltoreq.C-1, and for simplicity of description hereinafter, only N is consideredLThe case is 1.
From equations (3), (4), (5) we thus obtain:
the physical significance of the above formula is that when considering the HARQ-ACK information, the code rate of the transmission data block is the condition that the HARQ-ACK information is uniformly distributed in C code blocks, at the moment, the code rate of the transmission data block is approximately equal to the code rate at the code block level, but considering the mapping characteristic of the HARQ-ACK information, when C is>1, if the HARQ-ACK information is not mapped to all data code blocks, the HARQ-ACK information carried by the last code block is considered, and generally, the HARQ-ACK information always exists
At this time, the following equation holds
Rfix＜RC-1 (7)
It can be seen that due to the uneven distribution of the HARQ-ACK information, there exists a code block of the HARQ-ACK information, whose code rate at the code block level is always higher than that of the entire transmission data block. In addition, the physical layer decodes the data in code block units, if a code block is incorrectly decoded, the whole transmission data block is considered to be incorrectly decoded, and the transmission data block decoding error of the user is notified to the upper layer, so that the whole data transmission is influenced if the code block can not be ensured to be correctly transmitted.
As can be seen from the equation (2), the code rate of each code block and Kr, Er, and QACKrIn relation, Kr and Er can be calculated as described in the LTE protocol 36.212, and in this case, Q is only knownACKrThen, the code block of each code block is obtained, and Q is determinedACKrThe method of (a).
In this embodiment of the present invention, the determining, by the base station, the number of bits occupied by the control information in each code block includes:
the base station determines whether the number of subcarriers occupied by the control information is larger than the number of subcarriers occupied by the last code block in the N code blocks; the subcarriers occupied by the control information and the subcarriers occupied by the last code block respectively comprise one or more of the target air interface resources, and the N code blocks are divided from low to high according to the frequency domain information of the target air interface resources;
if not, the base station determines that the bit number occupied by the control information in the last code block is the total bit number of the control information, and determines that the bit number occupied by the control information in the first code block is zero; wherein the first code block is a code block of the N code blocks except for the last code block.
If so, the base station determines that the bit number occupied by the control information in the last code block is a product of a first bit number that can be borne by each resource element RE, the number of subcarriers occupied by the last code block, and the bit number of the control information that can be borne by any one subcarrier in the subcarriers occupied by the last code block;
the base station updates the number of the sub-carriers occupied by the control information to obtain the updated number of the sub-carriers; wherein the updated number of subcarriers is a difference value between the number of subcarriers occupied by the control information and the number of subcarriers occupied by the last code block;
when the number of the updated subcarriers is larger than a preset threshold, the base station determines whether the number of the updated subcarriers is larger than the number of subcarriers occupied by the penultimate code block;
when the number of the updated subcarriers is smaller than the number of subcarriers occupied by the penultimate code block, the base station determines that the bit number occupied by the control information in the penultimate code block is a difference value of the total bit number of the control information minus the bit number occupied by the control information in the last code block, and determines that the bit number occupied by the control information in the second code block is zero; the second code block is a code block of the N code blocks except for the last code block and the penultimate code block.
In the specific implementation process, according to the mapping characteristics of uplink information in the LTE protocol, each code block is mapped one by one on time-frequency domain resources, so that the number of subcarriers and symbols occupied by each code block in the frequency domain and the time domain can be calculated, and the number of the subcarriers occupied is assumed to be k in sequence1,k2,…,kr,…,kC-1(r-0.., C-1). Meanwhile, according to the mapping characteristics of the HARQ-ACK information, the situation that the total HARQ-ACK information occupies a plurality of subcarriers and corresponding symbol positions on a frequency domain can be obtained, and the number of the subcarriers occupied by the HARQ-ACK information is assumed to be kACKThe distribution of HARQ-ACK on each code block can be obtained from the flowchart shown in fig. 4, where the finally obtained n value in the flowchart is the number of code blocks affected by the HARQ-ACK information.
Specifically, it is assumed that a transport block TB of uplink information occupies 7 subcarriers in total, the numbers of the 7 subcarriers are sc 0-6 respectively, the transport block TB is divided into 3 code blocks CB, the first CB occupies 2 subcarriers, namely, subcarriers sc0 and sc1, the second CB occupies 2 subcarriers, namely, subcarriers sc2 and sc3, and the third CB occupies 3 subcarriers, namely, sc4, sc5 and sc6 respectively; HARQ is mapped and covered from back to front from the total subcarriers occupied by the TB block, and the HARQ maps 4 symbol positions on one subcarrier at most, supposing that the HARQ-ACK information occupies 7 REs in total, the number of the subcarriers occupied by the HARQ-ACK is calculated to be 2, the last two subcarriers sc5 and sc6 are occupied, and thus no HARQ-ACK information exists on the first code block and the second code block; assuming that the HARQ-ACK information occupies 13 REs in total, the HARQ-ACK information occupies 4 subcarriers in total, which are sc3, sc4, sc5 and sc6, so that there is no HARQ-ACK information on the first CB, 1 subcarrier on the second CB is occupied by HARQ-ACK information, and each subcarrier on the third CB is occupied by HARQ-ACK information.
Therefore, HARQ-ACK information distributed on each code block is obtained, and then the code rate of each code block can be obtained according to the formula (2).
Of course, it should be noted that according to the mapping characteristic that the HARQ-ACK information is mapped from the last subcarrier to the front, the number of symbols occupied by the HARQ-ACK information in the following code block is always greater than that of the preceding code block, and therefore, the base station may only determine the symbol positions occupied by the HARQ-ACK information in the following code blocks, and thus only determine the code rates of the following code blocks, and reduce the calculation amount of the base station.
After performing the completion step 203, the method in the embodiment of the present invention performs step 204, that is: when the code rate of any one of the N code blocks is higher than the preset threshold value, the base station adjusts the first scheduling information into second scheduling information; and when the terminal equipment transmits the uplink information by using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold value.
In a specific implementation process, after the base station determines the code rate of each code block, the base station determines whether the code rate of any code block in the N code blocks exceeds a preset threshold, where the preset threshold may be a threshold for error-free transmission. And if the code block with the code rate exceeding the preset threshold exists, performing code rate reduction operation on the scheduling result, and adjusting the first scheduling information into second scheduling information. The process of the bitrate reduction operation is the same as the corresponding process in step 203, and is not repeated herein, please refer to fig. 5, which is a flowchart of a complete example of the method for determining an uplink bitrate provided in the embodiment of the present invention, and it should be noted that the method for determining an uplink bitrate provided in the embodiment of the present invention is not limited to the implementation manner shown in the flowchart.
It should be noted that, according to the mapping characteristic of the HARQ-ACK information mapped from the last subcarrier to the front, the number of symbols occupied by the HARQ-ACK in the following code block is always greater than that in the preceding code block, i.e. there is QACKi≤QACKjI is more than or equal to 0 and less than j and less than or equal to (C-1), so that the base station can traverse from the last code block when determining whether the code rate of each code block exceeds a preset threshold, and stops traversing all code blocks as long as the code rate of a certain code block exceeds the threshold, and performs code rate reduction operation on the current scheduling result.
From the distribution calculation of HARQ-ACK information, when r is more than or equal to 0 and less than or equal to C-n-1, Q isACKr0, i.e. no HARQ-ACK information is distributed over the previous C-n code blocks; generally, when i is more than or equal to 0 and less than j is less than or equal to (C-1), KiAnd KjA difference of (a) and EiAnd EjThe difference is not great, so that it is obtained at this time that R is greater than or equal to 0 and less than or equal to C-n-1i≈RjTherefore, in the process of traversing from the last code block to the previous direction, when the code rate of a certain code block is not found to exceed the threshold when the code block r is reached, the process can be exited in advance, and the code rate reduction operation is not performed on the current scheduling result, so that the operation cost is saved.
The second aspect of the present invention provides a base station, which may be a base station in a wireless communication system such as an LTE system, an NR system, and the like, for example, a macro base station, a home base station, and the like, and may also be another base station. Referring to fig. 6, a schematic structural diagram of a base station according to an embodiment of the present invention is shown, where the base station includes:
a first determining module 601, configured to determine, when a terminal device needs to send uplink information, first scheduling information configured for the terminal device according to a use condition of an air interface resource at a current time and a size of the uplink information; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information;
a second determining module 602, configured to determine, according to the first scheduling information and the uplink information, a first transmission code rate when the terminal device transmits the uplink information;
a third determining module 603, configured to determine a code rate of each code block of the N code blocks when the first transmission code rate is smaller than a preset threshold; when the terminal device transmits the uplink information, the terminal device divides the uplink information into the N code blocks for transmission, wherein N is a positive integer;
an adjusting module 604, configured to adjust the first scheduling information to be second scheduling information when a code rate of any one of the N code blocks is higher than the preset threshold; and when the terminal equipment transmits the uplink information by using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold value.
Since the base station provided in the second aspect of the present invention is proposed under the same concept as the method for determining an uplink code rate provided in the first aspect of the present invention, various variations and specific embodiments of the method for determining an uplink code rate in the foregoing embodiments of fig. 2 to 5 are also applicable to the base station of this embodiment, and through the foregoing detailed description of the method for determining an uplink code rate, a person skilled in the art can clearly know the implementation process of the base station in this embodiment, so for the brevity of the description, detailed description is not repeated here.
A third aspect of the present invention provides a base station, which may be a base station in a wireless communication system such as an LTE system or an NR system, for example, a base station (such as a macro base station or a home base station), an RN (relay) device, or another base station. Fig. 7 is a block diagram of a base station according to an embodiment of the present invention. As shown in fig. 7, the base station includes:
the processor 701 is configured to determine, when it is determined that the terminal device needs to send uplink information according to the information received by the receiver 702, first scheduling information configured for the terminal device according to a use condition of an air interface resource at a current time and a size of the uplink information; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information;
the processor 701 is further configured to determine, according to the first scheduling information and the uplink information, a first transmission code rate when the terminal device transmits the uplink information;
the processor 701 is further configured to determine a code rate of each of the N code blocks when the first transmission code rate is smaller than a preset threshold; when the terminal device transmits the uplink information, the terminal device divides the uplink information into the N code blocks for transmission, wherein N is a positive integer;
the processor 701 is further configured to adjust the first scheduling information to be second scheduling information when a code rate of any one of the N code blocks is higher than the preset threshold; the second transmission code rate is smaller than the first transmission code rate, the second transmission code rate is determined by the base station according to the second scheduling information and the uplink information when the terminal device transmits the uplink information, and after the transmitter 703 sends the second scheduling information to the terminal device under the control of the processor 701, when the terminal device transmits the uplink information using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold.
Optionally, the processor 701 may specifically be a central processing unit, an Application Specific Integrated Circuit (ASIC), one or more Integrated circuits for controlling program execution, a hardware Circuit developed by using a Field Programmable Gate Array (FPGA), or a baseband processor.
Optionally, processor 701 may include at least one processing core.
Optionally, the electronic device further includes a Memory, where the Memory may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memories are used to store data that is needed by the processor 701 during operation. The number of the memories is one or more.
Since the base station provided in the third aspect of the present invention is proposed under the same concept as the method for determining an uplink code rate provided in the first aspect of the present invention, various variations and specific embodiments of the method for determining an uplink code rate in the foregoing embodiments of fig. 2 to 5 are also applicable to the base station of this embodiment, and a person skilled in the art can clearly know the implementation process of the base station in this embodiment through the foregoing detailed description of the method for determining an uplink code rate, so for the brevity of the description, detailed description is not repeated here.
A fourth aspect of an embodiment of the present invention provides a computer apparatus, including:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, and the at least one processor executes the instructions stored in the memory to perform the method for transmitting the local service using the communication interface.
A fifth aspect of the present invention provides a computer-readable storage medium, which is characterized by storing computer instructions, when the computer instructions are executed on a computer, the computer instructions cause the computer to execute the method for sending the local service.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A method for determining an uplink code rate, the method comprising:
when terminal equipment needs to send uplink information, a base station determines first scheduling information configured for the terminal equipment according to the use condition of air interface resources at the current moment and the size of the uplink information; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information;
the base station determines a first transmission code rate when the terminal equipment transmits the uplink information according to the first scheduling information and the uplink information;
when the first transmission code rate is smaller than a preset threshold value, the base station determines the code rate of each code block in the N code blocks; when the terminal device transmits the uplink information, the terminal device divides the uplink information into the N code blocks for transmission, wherein N is a positive integer;
when the code rate of any one of the N code blocks is higher than the preset threshold value, the base station adjusts the first scheduling information into second scheduling information; and when the terminal equipment transmits the uplink information by using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold value.
2. The method of claim 1, wherein the code rate for each of the N code blocks is determined by:
the base station determines whether the uplink information contains control information; the control information comprises any one or more of Channel Quality Indication (CQI) information, Rank Indication (RI) information, Precoding Matrix Indication (PMI) information and hybrid automatic repeat request acknowledgement (HARQ-ACK) information;
and when the uplink information is determined to contain the control information, the base station triggers the base station to determine the code rate of each code block.
3. The method of claim 2, wherein the code rate for each of the N code blocks is determined by:
the base station determines the bit number occupied by the control information in each code block;
the base station determines the code rate of each code block as the ratio of the bit number of the uplink data contained in the code block to a first difference value; the first difference is the difference between the number of bits obtained after the code block is subjected to channel coding and rate matching and the number of bits occupied by the control information in the code block.
4. The method of claim 3, wherein the base station determining the number of bits occupied by the control information in each code block comprises:
the base station determines whether the number of subcarriers occupied by the control information is larger than the number of subcarriers occupied by the last code block in the N code blocks; the subcarriers occupied by the control information and the subcarriers occupied by the last code block respectively comprise one or more of the target air interface resources, and the N code blocks are divided from low to high according to the frequency domain information of the target air interface resources;
if not, the base station determines that the bit number occupied by the control information in the last code block is the total bit number of the control information, and determines that the bit number occupied by the control information in the first code block is zero; wherein the first code block is a code block of the N code blocks except for the last code block.
5. The method of claim 4, wherein after the base station determines whether the number of subcarriers occupied by the control information is greater than the number of subcarriers occupied by the last code block, the method further comprises:
if so, the base station determines that the bit number occupied by the control information in the last code block is a product of a first bit number that can be borne by each resource element RE, the number of subcarriers occupied by the last code block, and the bit number of the control information that can be borne by any one subcarrier in the subcarriers occupied by the last code block;
the base station updates the number of the sub-carriers occupied by the control information to obtain the updated number of the sub-carriers; wherein the updated number of subcarriers is a difference value between the number of subcarriers occupied by the control information and the number of subcarriers occupied by the last code block;
when the number of the updated subcarriers is larger than a preset threshold, the base station determines whether the number of the updated subcarriers is larger than the number of subcarriers occupied by the penultimate code block;
when the number of the updated subcarriers is smaller than the number of subcarriers occupied by the penultimate code block, the base station determines that the bit number occupied by the control information in the penultimate code block is a difference value of the total bit number of the control information minus the bit number occupied by the control information in the last code block, and determines that the bit number occupied by the control information in the second code block is zero; the second code block is a code block of the N code blocks except for the last code block and the penultimate code block.
6. A base station, comprising:
a first determining module, configured to determine, when a terminal device needs to send uplink information, first scheduling information configured for the terminal device according to a use condition of an air interface resource at a current time and a size of the uplink information; the first scheduling information is used for indicating a target air interface resource, a coding mode and a Modulation and Coding Strategy (MCS) level used by the terminal equipment for sending the uplink information;
a second determining module, configured to determine, according to the first scheduling information and the uplink information, a first transmission code rate when the terminal device transmits the uplink information;
a third determining module, configured to determine a code rate of each of the N code blocks when the first transmission code rate is smaller than a preset threshold; when the terminal device transmits the uplink information, the terminal device divides the uplink information into the N code blocks for transmission, wherein N is a positive integer;
an adjusting module, configured to adjust the first scheduling information to be second scheduling information when a code rate of any one of the N code blocks is higher than the preset threshold; and when the terminal equipment transmits the uplink information by using the second transmission code rate, the code rate of any one of the N code blocks is lower than the preset threshold value.
7. The base station of claim 6, wherein the code rate for each of the N code blocks is determined by:
determining whether the uplink information contains control information; the control information comprises any one or more of Channel Quality Indication (CQI) information, Rank Indication (RI) information, Precoding Matrix Indication (PMI) information and hybrid automatic repeat request acknowledgement (HARQ-ACK) information;
and triggering the self to determine the code rate of each code block when the uplink information is determined to contain the control information.
8. The base station of claim 7, wherein the code rate for each of the N code blocks is determined by:
determining the number of bits occupied by the control information in each code block;
determining the code rate of each code block as the ratio of the bit number of the uplink data contained in the code block to a first difference value; the first difference is the difference between the number of bits obtained after the code block is subjected to channel coding and rate matching and the number of bits occupied by the control information in the code block.
9. The base station of claim 8, wherein determining the number of bits occupied by the control information in each code block comprises:
determining whether the number of subcarriers occupied by the control information is greater than the number of subcarriers occupied by the last code block in the N code blocks; the subcarriers occupied by the control information and the subcarriers occupied by the last code block respectively comprise one or more of the target air interface resources, and the N code blocks are divided from low to high according to the frequency domain information of the target air interface resources;
if not, determining that the bit number occupied by the control information in the last code block is the total bit number of the control information, and determining that the bit number occupied by the control information in the first code block is zero; wherein the first code block is a code block of the N code blocks except for the last code block.
10. The base station of claim 9, after determining whether the number of subcarriers occupied by the control information is greater than the number of subcarriers occupied by the last code block, further comprising:
if so, determining that the bit number occupied by the control information in the last code block is a product of a first bit number that can be borne by each Resource Element (RE), the number of subcarriers occupied by the last code block, and the bit number of the control information that can be borne by any one subcarrier in the subcarriers occupied by the last code block;
updating the number of the sub-carriers occupied by the control information to obtain the updated number of the sub-carriers; wherein the updated number of subcarriers is a difference value between the number of subcarriers occupied by the control information and the number of subcarriers occupied by the last code block;
when the number of the updated subcarriers is larger than a preset threshold, determining whether the number of the updated subcarriers is larger than the number of subcarriers occupied by the penultimate code block;
when the number of the updated subcarriers is smaller than the number of subcarriers occupied by the penultimate code block, determining that the bit number occupied by the control information in the penultimate code block is a difference value obtained by subtracting the bit number occupied by the control information in the last code block from the total bit number of the control information, and determining that the bit number occupied by the control information in the second code block is zero by the base station; the second code block is a code block of the N code blocks except for the last code block and the penultimate code block.
11. A computer device, the computer device comprising:
at least one processor, and
a memory communicatively coupled to the at least one processor, a communication interface;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of any one of claims 1-5 with the communications interface by executing the instructions stored by the memory.
12. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-5.
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