CN115665874B - Downlink PDSCH scheduling method and system based on CQI table - Google Patents
Downlink PDSCH scheduling method and system based on CQI table Download PDFInfo
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Abstract
The invention relates to a downlink PDSCH scheduling method and system based on CQI table, comprising the following steps: s1, a base station transmits MCS to UE to perform downlink PDSCH scheduling; s2, when the UE receives the MCS in the preset time, selecting a table matched with the MCS, and mapping CQI; if not, mapping CQI according to a default CQI table; s3, the UE reports CQI to the base station; s4, the base station analyzes CQI, if no abnormality exists, the base station maps MCS according to a CQI table and an MCS table selected by the last downlink PDSCH scheduling, and downlink PDSCH scheduling is carried out; if the downlink PDSCH is abnormal, selecting another CQI table and another MCS table to map MCS, and performing downlink PDSCH scheduling; returning to step S1. The invention can complete downlink PDSCH dispatching by using a CQI table containing 16 CQI values at most according to the specification of a 3gpp protocol, and can accurately match dispatching strategies.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a downlink PDSCH scheduling method and system based on a CQI table.
Background
CQI (Channel Quality Indication, channel quality indicator) table, configured to record downlink channel quality information measured by a User Equipment (UE), and report the downlink channel quality information to a base station, where the base station selects an appropriate downlink PDSCH (Physical Downlink Shared Channel ) schedule according to information provided by the CQI table. And the 3gpp protocol quantizes the CQI into 4 bits (0-15), and each corresponds to different modulation modes and code rates. The measurement of CQI needs to take into account SINR (signal to Interference plus Noise Ratio ) and the capability of the receiver of the UE. On the basis of keeping 4-bit CQI feedback, only 16 values can be quantized, and MCS (Modulation and Coding Scheme, modulation and coding strategy) can have more values (including 28 or more) at most, so when a base station performs scheduling, a certain ambiguity occurs when selecting MCS according to the 4-bit CQI feedback, and the scheduling strategy cannot be timely and accurately given.
Therefore, it is desirable to provide a method and system that can facilitate the base station to give an accurate PDSCH scheduling policy.
Disclosure of Invention
The invention aims to provide a downlink PDSCH scheduling method and a system based on a CQI table, which can finish downlink PDSCH scheduling on the basis that CQI specified by a 3gpp protocol is not more than 4 bits.
In order to solve the technical problems, the invention provides a downlink PDSCH scheduling method based on a CQI table, which comprises the following steps:
s1, a base station transmits MCS to UE to perform downlink PDSCH scheduling;
s2, the UE judges whether the MCS is received in a preset time, if so, a table matched with the MCS is selected from preset CQI tables, and CQI corresponding to the current SNR of the UE is mapped; if not, mapping CQI corresponding to the current SNR of the UE according to a default CQI table; the preset CQI table comprises a first CQI table and a second CQI table; the default CQI table is the first CQI table or the second CQI table;
s3, the UE reports the CQI to the base station;
s4, the base station analyzes the CQI and judges whether the CQI is abnormal according to preset abnormal conditions; if not, mapping a code rate corresponding to the CQI according to a CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to an MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if yes, selecting another CQI table different from the CQI table selected by the previous downlink PDSCH scheduling, mapping out the code rate corresponding to the CQI, mapping out the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; and returning to the step S1.
Further, the first CQI table and the second CQI table each include 16 CQIs, SNRs, and code rates.
Further, the CQI of the 2 th to 15 th strips of the first CQI table is mapped with the MCS of the 0 th to 13 th strips of the MCS table one by one; the code rate of the 2 nd to 15 th pieces is mapped with the code rate of the 0 th to 13 th pieces of the MCS table one by one; CQI of the 0 th-1 th strip is mapped with MCS of the 0 th strip of the MCS table; the code rate of the 0 th to the 1 st is smaller than the code rate of the 2 nd;
the CQI of the 0 th to 15 th of the second CQI table is mapped with the CQI of the 13 th to 28 th of the MCS table one by one; the code rates of the 0 th to 15 th strips are mapped with the code rates of the 13 th to 28 th strips of the MCS table one by one.
Further, the abnormal condition is that the following three judgment standards are satisfied simultaneously:
first judgment criteria: within the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-solving feedback or PDSCH scheduling is not received;
second judgment criterion: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
third judgment criterion: and in the preset time, the absolute value X of the difference value between the code rate X0 corresponding to the last downlink PDSCH scheduling and the code rate Xa obtained from the mapping of the first CQI table according to the CQI reported by the UE, and the absolute value Y of the difference value between the code rate X0 and the code rate Xb obtained from the mapping of the second CQI table according to the CQI reported by the UE, wherein the absolute value of the difference value is smaller than a second threshold value R2.
Further, the second threshold value R2 ranges from 0 to 1.
In order to solve the technical problem, the invention also provides a downlink PDSCH scheduling system based on the CQI table, which comprises a base station and UE;
the base station comprises a first downlink PDSCH scheduling unit, wherein the first downlink PDSCH scheduling unit is used for transmitting MCS to UE and performing downlink PDSCH scheduling; analyzing the CQI reported by the UE, and judging whether the CQI is abnormal according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to a CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to an MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if yes, selecting another CQI table different from the CQI table selected by the previous downlink PDSCH scheduling, mapping out the code rate corresponding to the CQI, mapping out the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS;
the UE comprises a second downlink PDSCH scheduling unit, wherein the second downlink PDSCH scheduling unit is used for judging whether the MCS sent by the base station is received in a preset time, if yes, a CQI table matched with the MCS is selected from preset CQI tables, and CQI corresponding to the current SNR of the UE is mapped; if not, mapping CQI corresponding to the current SNR of the UE according to a default CQI table; reporting the CQI to the base station; the preset CQI table comprises a first CQI table and a second CQI table; the default CQI table is the first CQI table or the second CQI table.
Further, the first CQI table and the second CQI table each include 16 CQIs, SNRs, and code rates.
Further, the CQI of the 2 th to 15 th strips of the first CQI table is mapped with the MCS of the 0 th to 13 th strips of the MCS table one by one; the code rates of the 2 nd to the 15 th are respectively mapped with the code rates of the 0 th to the 13 th of the MCS table one by one; CQI of the 0 th-1 th strip is mapped with MCS of the 0 th strip of the MCS table; the code rate of the 0 th to the 1 st is smaller than the code rate of the 2 nd;
the CQI of the 0 th to 15 th of the second CQI table is mapped with the CQI of the 13 th to 28 th of the MCS table one by one respectively; the code rates of the 0 th to the 15 th are respectively mapped with the code rates of the 13 th to the 28 th of the MCS table one by one.
Further, the abnormal condition is that the following three judgment standards are satisfied simultaneously:
first judgment criteria: within the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-solving feedback or PDSCH scheduling is not received;
second judgment criterion: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
third judgment criterion: and in the preset time, the absolute value X of the difference value between the code rate X0 corresponding to the last downlink PDSCH scheduling and the code rate Xa obtained from the mapping of the first CQI table according to the CQI reported by the UE and the absolute value Y of the difference value between the code rate X0 and the code rate Xb obtained from the mapping of the second CQI table according to the CQI reported by the UE, wherein the absolute value of the difference value of the two is larger than or equal to a second threshold value R2.
Further, the second threshold value R2 ranges from 0 to 1.
Compared with the prior art, the invention has the following beneficial effects: the invention can complete downlink PDSCH dispatching by using a CQI table containing 16 CQI values at most according to the specification of a 3gpp protocol, and can accurately match dispatching strategies.
Drawings
Fig. 1 is a flowchart of a downlink PDSCH scheduling method based on a CQI table according to an embodiment of the present invention;
fig. 2 is a diagram of a downlink PDSCH scheduling system based on a CQI table according to an embodiment of the present invention;
fig. 3 is a first CQI table of an embodiment of the present invention;
fig. 4 is a second CQI table of an embodiment of the present invention;
fig. 5 is a MCS table of an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged where appropriate to implement in other sequences than those of the embodiments of the invention.
As shown in fig. 1, the downlink PDSCH scheduling method based on the CQI table according to the embodiment of the present invention includes the following steps:
s1, a base station sends MCS to UE to perform downlink PDSCH scheduling.
S2, the UE judges whether the MCS is received in a preset time, if so, a table matched with the MCS is selected from preset CQI tables, and CQI corresponding to the current SNR of the UE is mapped; if not, mapping CQI corresponding to the current SNR of the UE according to a default CQI table; the preset CQI table comprises a first CQI table and a second CQI table; the default CQI table is the first CQI table or the second CQI table.
And S3, the UE reports CQI to the base station.
S4, the base station analyzes the CQI and judges whether the CQI is abnormal according to preset abnormal conditions; if not, mapping out the code rate corresponding to the CQI according to the CQI table selected by the previous downlink PDSCH scheduling, mapping out the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if yes, selecting another CQI table different from the CQI table selected by the previous downlink PDSCH scheduling, mapping out the code rate corresponding to the CQI, mapping out the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; returning to step S1.
As further shown in fig. 2, the downlink PDSCH scheduling system based on the CQI table according to the embodiment of the present invention includes a base station and a UE.
The base station comprises a first downlink PDSCH scheduling unit, wherein the first downlink PDSCH scheduling unit is used for transmitting MCS to UE and carrying out downlink PDSCH scheduling; analyzing CQI reported by UE, and judging whether the UE is abnormal according to a preset abnormal condition; if not, mapping out the code rate corresponding to the CQI according to the CQI table selected by the previous downlink PDSCH scheduling, mapping out the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if yes, selecting another CQI table different from the CQI table selected by the previous downlink PDSCH scheduling, mapping the code rate corresponding to the CQI, mapping the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS.
The UE comprises a second downlink PDSCH scheduling unit, wherein the second downlink PDSCH scheduling unit is used for judging whether the MCS sent by the base station is received in a preset time, if yes, a CQI table matched with the MCS is selected from the preset CQI tables, and CQI corresponding to the current SNR of the UE is mapped; if not, mapping CQI corresponding to the current SNR of the UE according to a default CQI table; reporting CQI to a base station; the preset CQI table comprises a first CQI table and a second CQI table; the default CQI table is the first CQI table or the second CQI table.
Specifically, in the present embodiment, as shown in fig. 3, 4, and 5, each of the first CQI table and the second CQI table includes 16 CQIs, SNRs, modulations, and code rates. The MCS table includes 29 MCSs, modulation and code rates.
The CQI of the 2 th to 15 th strips of the first CQI table is mapped with the MCS of the 0 th to 13 th strips of the MCS table one by one; the code rate of the 2 nd to 15 th is mapped with the code rate of the 0 th to 13 th of the MCS table one by one; CQI of the 0 th to 1 th strips is mapped with MCS of the 0 th strip of the MCS table; the code rate of the 0 th to 1 st pieces of the first CQI table is smaller than the code rate of the 2 nd pieces.
The CQI of the 0 th to 15 th of the second CQI table is mapped with the CQI of the 13 th to 28 th of the MCS table one by one; the code rates of the 0 th to 15 th strips are mapped one by one with the code rates of the 13 th to 28 th strips of the MCS table.
Specifically, in the present embodiment, the abnormal condition is that the following three judgment criteria are satisfied at the same time:
first judgment criteria: and in the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-solving feedback or PDSCH scheduling is not received.
Second judgment criterion: and in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1. The first threshold value R1 ranges from 0 to 120km/h.
Third judgment criterion: and within a preset time, the absolute value X of the difference value between the code rate X0 corresponding to the last downlink PDSCH scheduling and the code rate Xa obtained by mapping from a first CQI table according to the CQI reported by the UE, and the absolute value Y of the difference value between the code rate X0 corresponding to the last downlink PDSCH scheduling and the code rate Xb obtained by mapping from a second CQI table according to the CQI reported by the UE, wherein the absolute value of the difference value is smaller than a second threshold value R2. The second threshold value R2 ranges from 0 to 1.
Assuming that mcs=5 received by the UE at a predetermined time, since CQIs of the 2 nd to 15 th strips of the first CQI table are mapped one-to-one with MCSs of the 0 th to 13 th strips of the MCS table, the UE selects the first CQI table to map out CQIs corresponding to the current SNRs of the UE. Assuming that the current SNR of the UE is snra3, the corresponding cqi=3, and the UE reports cqi=3 to the base station.
If the UE does not receive the MCS within the preset time, selecting a default CQI table (a first CQI table or a second CQI table), mapping the CQI corresponding to the current SNR of the UE, and if the default CQI table is the first CQI table and the current SNR of the UE is snra5, reporting the corresponding CQI=5 to the base station by the UE.
If the base station receives cqi=3 and judges that there is no abnormality, the base station selects the CQI table used for the last downlink PDSCH scheduling, i.e., the first CQI table. Then, the code rate= 0.1543 corresponding to cqi=3 is mapped, mcs=1 corresponding to code rate= 0.1543 is mapped according to the MCS table, the corresponding downlink PDSCH scheduling is selected through mcs=1, and then mcs=1 is sent to the UE for the next downlink PDSCH scheduling.
If there is an abnormality, another CQI table different from the CQI table selected by the previous downlink PDSCH scheduling, that is, the second CQI table is selected, the code rate= 0.6426 corresponding to cqi=3 is mapped, the mcs=16 corresponding to code rate= 0.6426 is mapped according to the MCS table, the corresponding downlink PDSCH scheduling is selected by mcs=16, and then mcs=16 is transmitted to the UE for the next downlink PDSCH scheduling.
In addition to the code rates shown in the table of fig. 3, 4, 5, other code rates may be provided by those skilled in the art without affecting the practice of the present invention. In addition, the mapping relation between the first CQI table, the second CQI table and the MCS table can be set according to the actual situation, and the implementation of the invention is not influenced.
In summary, the embodiment of the present invention can complete downlink PDSCH scheduling by using a CQI table containing at most 16 CQI values according to the 3gpp protocol, and can accurately match the scheduling policy.
The foregoing examples only illustrate preferred embodiments of the invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that modifications and improvements can be made without departing from the spirit of the invention, such as combining different features of the various embodiments, which are all within the scope of the invention.
Claims (10)
1. The downlink PDSCH scheduling method based on the CQI table is characterized by comprising the following steps:
s1, a base station transmits MCS to UE to perform downlink PDSCH scheduling;
s2, the UE judges whether the MCS is received in a preset time, if so, a table matched with the MCS is selected from preset CQI tables, and CQI corresponding to the current SNR of the UE is mapped; if not, mapping CQI corresponding to the current SNR of the UE according to a default CQI table; the preset CQI table comprises a first CQI table and a second CQI table; the default CQI table is the first CQI table or the second CQI table;
s3, the UE reports the CQI to the base station;
s4, the base station analyzes the CQI and judges whether the CQI is abnormal according to preset abnormal conditions; if not, mapping a code rate corresponding to the CQI according to a CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to an MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if yes, selecting another CQI table different from the CQI table selected by the previous downlink PDSCH scheduling, mapping out the code rate corresponding to the CQI, mapping out the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; and returning to the step S1.
2. The downlink PDSCH scheduling method based on CQI tables of claim 1, wherein the first CQI table and the second CQI table each include 16 CQIs, SNRs and code rates.
3. The downlink PDSCH scheduling method based on the CQI table of claim 2, wherein CQIs of the 2 th to 15 th of the first CQI table are mapped one by one with MCSs of the 0 th to 13 th of the MCS table; the code rate of the 2 nd to 15 th pieces is mapped with the code rate of the 0 th to 13 th pieces of the MCS table one by one; CQI of the 0 th-1 th strip is mapped with MCS of the 0 th strip of the MCS table; the code rate of the 0 th to the 1 st is smaller than the code rate of the 2 nd;
the CQI of the 0 th to 15 th of the second CQI table is mapped with the CQI of the 13 th to 28 th of the MCS table one by one; the code rates of the 0 th to 15 th strips are mapped with the code rates of the 13 th to 28 th strips of the MCS table one by one.
4. The downlink PDSCH scheduling method based on the CQI table of claim 2, wherein the abnormal condition is that the following three judgment criteria are satisfied at the same time:
first judgment criteria: within the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-solving feedback or PDSCH scheduling is not received;
second judgment criterion: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
third judgment criterion: and in the preset time, the absolute value X of the difference value between the code rate X0 corresponding to the last downlink PDSCH scheduling and the code rate Xa obtained from the mapping of the first CQI table according to the CQI reported by the UE, and the absolute value Y of the difference value between the code rate X0 and the code rate Xb obtained from the mapping of the second CQI table according to the CQI reported by the UE, wherein the absolute value of the difference value is smaller than a second threshold value R2.
5. The downlink PDSCH scheduling method based on the CQI table of claim 4, wherein the second threshold R2 ranges from 0 to 1.
6. The downlink PDSCH scheduling system based on the CQI table is characterized by comprising a base station and UE;
the base station comprises a first downlink PDSCH scheduling unit, wherein the first downlink PDSCH scheduling unit is used for transmitting MCS to UE and performing downlink PDSCH scheduling; analyzing the CQI reported by the UE, and judging whether the CQI is abnormal according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to a CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to an MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if yes, selecting another CQI table different from the CQI table selected by the previous downlink PDSCH scheduling, mapping out the code rate corresponding to the CQI, mapping out the MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS;
the UE comprises a second downlink PDSCH scheduling unit, wherein the second downlink PDSCH scheduling unit is used for judging whether the MCS sent by the base station is received in a preset time, if yes, a CQI table matched with the MCS is selected from preset CQI tables, and CQI corresponding to the current SNR of the UE is mapped; if not, mapping CQI corresponding to the current SNR of the UE according to a default CQI table; reporting the CQI to the base station; the preset CQI table comprises a first CQI table and a second CQI table; the default CQI table is the first CQI table or the second CQI table.
7. The system for downlink PDSCH scheduling based on CQI tables of claim 6, wherein the first CQI table and the second CQI table each comprise 16 CQIs, SNRs and code rates.
8. The system for downlink PDSCH scheduling based on the CQI table of claim 7, wherein CQIs of items 2-15 of the first CQI table are mapped one-to-one with MCSs of items 0-13 of the MCS table; the code rates of the 2 nd to the 15 th are respectively mapped with the code rates of the 0 th to the 13 th of the MCS table one by one; CQI of the 0 th-1 th strip is mapped with MCS of the 0 th strip of the MCS table; the code rate of the 0 th to the 1 st is smaller than the code rate of the 2 nd;
the CQI of the 0 th to 15 th of the second CQI table is mapped with the CQI of the 13 th to 28 th of the MCS table one by one respectively; the code rates of the 0 th to the 15 th are respectively mapped with the code rates of the 13 th to the 28 th of the MCS table one by one.
9. The system for downlink PDSCH scheduling based on the CQI table of claim 7, wherein the abnormal condition is that the following three criteria are satisfied at the same time:
first judgment criteria: within the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-solving feedback or PDSCH scheduling is not received;
second judgment criterion: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
third judgment criterion: and in the preset time, the absolute value X of the difference value between the code rate X0 corresponding to the last downlink PDSCH scheduling and the code rate Xa obtained from the mapping of the first CQI table according to the CQI reported by the UE and the absolute value Y of the difference value between the code rate X0 and the code rate Xb obtained from the mapping of the second CQI table according to the CQI reported by the UE, wherein the absolute value of the difference value of the two is larger than or equal to a second threshold value R2.
10. The system for downlink PDSCH scheduling based on the CQI table of claim 9, wherein the second threshold value R2 ranges from 0 to 1.
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