CN115665874A - CQI table-based downlink PDSCH scheduling method and system - Google Patents
CQI table-based downlink PDSCH scheduling method and system Download PDFInfo
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Abstract
The invention relates to a downlink PDSCH scheduling method and system based on a CQI table, comprising the following steps: s1, a base station sends MCS to UE to carry out downlink PDSCH scheduling; s2, if the UE receives the MCS in the preset time, selecting a table matched with the MCS, and mapping the CQI; if not, mapping the CQI according to a default CQI table; s3, reporting the CQI to a base station by the UE; s4, the base station analyzes the CQI, if no abnormity exists, the MCS is mapped according to the CQI table and the MCS table selected by the last downlink PDSCH scheduling, and the downlink PDSCH scheduling is carried out; if the downlink PDSCH scheduling is abnormal, selecting another CQI table and another MCS table to map the MCS, and performing the downlink PDSCH scheduling; the process returns to step S1. The invention can use the CQI table containing 16 CQI values at most to complete the downlink PDSCH scheduling according to the specification of the 3gpp protocol, and can accurately match the scheduling strategy.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a downlink PDSCH scheduling method and system based on a CQI table.
Background
A CQI (Channel Quality Indication) 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 a suitable Downlink PDSCH (Physical Downlink Shared Channel) for scheduling according to the information provided by the CQI table. The 3gpp protocol quantizes the CQI to 4 bits (0 to 15), each corresponding to a different modulation scheme and code rate. The measurement of the CQI needs to take SINR (signal to Interference plus Noise Ratio) into consideration as well as the capability of the receiver of the UE. On the basis of keeping 4-bit CQI feedback, only 16 values can be quantized, and the MCS (Modulation and Coding Scheme, modulation and Coding strategy) can have more values (including 28 or more) at most, so that when the base station performs scheduling, a certain ambiguity occurs when the MCS is selected according to the 4-bit CQI feedback, and the scheduling strategy cannot be accurately given in time.
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 technical problem to be solved by the invention is to provide a downlink PDSCH scheduling method and system based on a CQI table, which can complete downlink PDSCH scheduling on the basis that the CQI specified by a 3gpp protocol is not more than 4 bits.
In order to solve the above technical problem, the present invention provides a downlink PDSCH scheduling method based on CQI tables, including the following steps:
s1, a base station sends MCS to UE to carry out downlink PDSCH scheduling;
s2, the UE judges whether the MCS is received within preset time, if so, a table matched with the MCS is selected from preset CQI tables, and the CQI corresponding to the current SNR of the UE is mapped; if not, mapping the 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 or not according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to the CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if so, selecting another CQI table different from the CQI table selected by the last downlink PDSCH scheduling, mapping a code rate corresponding to the CQI, mapping an MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; 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 CQIs of items 2 to 15 of the first CQI table are mapped one-to-one with the MCSs of items 0 to 13 of the MCS table; mapping the 2 nd to 15 th code rates with the 0 th to 13 th code rates of the MCS table one by one; mapping the CQI of the 0 th to the 1 st MCS with the MCS of the 0 th MCS table; the code rate of the 0 th item to the 1 st item is less than the code rate of the 2 nd item;
the CQI of the 0 th to the 15 th items of the second CQI table and the CQI of the 13 th to the 28 th items of the MCS table are mapped one by one; the code rates of items 0 to 15 are mapped one to one with the code rates of items 13 to 28 of the MCS table.
Further, the abnormal condition is that the following three judgment criteria are simultaneously satisfied:
the first judgment criterion is as follows: in the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-releasing feedback or PDSCH scheduling is not received;
the second judgment criterion is as follows: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
the third judgment standard: 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 by mapping from the first CQI table according to the CQI reported by the UE at this time, and the absolute value Y of the difference value between the X0 and the code rate Xb obtained by mapping from the second CQI table according to the CQI reported by the UE at this time are smaller than a second threshold R2.
Further, the second threshold R2 ranges from 0 to 1.
In order to solve the above technical problem, the present invention further provides a system for scheduling downlink PDSCH based on CQI table, including 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 sending MCS to UE (user equipment) and performing downlink PDSCH scheduling; analyzing the CQI reported by the UE, and judging whether the CQI is abnormal or not according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to the CQI table selected by the last downlink PDSCH scheduling, mapping an 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 form different from the CQI form selected by the last downlink PDSCH scheduling, mapping a code rate corresponding to the CQI, mapping an MCS corresponding to the code rate according to the MCS form, 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 an MCS sent by a base station is received within preset time, if so, a CQI table matched with the MCS is selected from preset CQI tables, and the CQI corresponding to the current SNR of the UE is mapped; if not, mapping the 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 CQIs of items 2 to 15 of the first CQI table are mapped one-to-one with the MCSs of items 0 to 13 of the MCS table; the code rates of the 2 nd to 15 th are respectively mapped with the code rates of the 0 th to 13 th of the MCS table one by one; mapping the CQI of the 0 th to the 1 st MCS with the MCS of the 0 th MCS table; the code rate of the 0 th item to the 1 st item is less than the code rate of the 2 nd item;
the CQI of the 0 th to the 15 th CQI items of the second CQI table are respectively mapped with the CQI of the 13 th to the 28 th CQI items of the MCS table one by one; 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 in the MCS table one by one.
Further, the abnormal condition is that the following three judgment criteria are simultaneously satisfied:
the first judgment standard: in the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-releasing feedback or PDSCH scheduling is not received;
the second judgment criterion is as follows: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
the third judgment standard: 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 by mapping from the first CQI table according to the CQI reported by the UE at this time, and the absolute value Y of the difference value between the X0 and the code rate Xb obtained by mapping from the second CQI table according to the CQI reported by the UE at this time are more than or equal to a second threshold value R2.
Further, the second threshold R2 ranges from 0 to 1.
Compared with the prior art, the invention has the following beneficial effects: the invention can use the CQI table containing 16 CQI values at most to complete the downlink PDSCH scheduling according to the specification of the 3gpp protocol, and can accurately match the scheduling strategy.
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 structural 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 an MCS table of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is 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 elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that the operations are performed in other sequences than in the embodiments of the invention.
As shown in fig. 1, the downlink PDSCH scheduling method based on CQI table according to the embodiment of the present invention includes the following steps:
s1, the base station sends MCS to UE to carry out downlink PDSCH scheduling.
S2, the UE judges whether the MCS is received within preset time, if so, a table matched with the MCS is selected from preset CQI tables, and the CQI corresponding to the current SNR of the UE is mapped; if not, mapping the CQI corresponding to the current SNR of the UE according to a default CQI table; the preset CQI tables comprise 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, reporting the CQI to the base station by the UE.
S4, the base station analyzes the CQI and judges whether the CQI is abnormal or not according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to the CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if so, selecting another CQI table different from the CQI table selected by the last downlink PDSCH scheduling, mapping a code rate corresponding to the CQI, mapping an MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; the process returns to step S1.
As further shown in fig. 2, the downlink PDSCH scheduling system based on 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 sending MCS to the UE to perform downlink PDSCH scheduling; analyzing the CQI reported by the UE, and judging whether the CQI is abnormal or not according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to the CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if so, selecting another CQI table different from the CQI table selected by the last downlink PDSCH scheduling, mapping a code rate corresponding to the CQI, mapping an 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 within preset time, if so, a CQI table matched with the MCS is selected from preset CQI tables, and the CQI corresponding to the current SNR of the UE is mapped; if not, mapping the CQI corresponding to the current SNR of the UE according to a default CQI table; reporting the CQI to a base station; the preset CQI tables comprise 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, the first CQI table and the second CQI table each include 16 CQIs, SNRs, modulations, and code rates. The MCS table includes 29 MCSs, modulations and code rates.
The 2 nd to 15 th CQI of the first CQI table and the 0 th to 13 th MCS of the MCS table are mapped one by one; mapping the code rates of the 2 nd to the 15 th to the code rates of the 0 th to the 13 th in the MCS table one by one; mapping the CQI of the 0 th to the MCS of the 1 st in the MCS table; the code rate of items 0-1 of the first CQI table is less than the code rate of item 2.
The CQI of item 0-15 of the second CQI table is mapped with the CQI of item 13-28 of the MCS table one by one; the code rates of items 0 to 15 are mapped one-to-one with the code rates of items 13 to 28 of the MCS table.
Specifically, in the present embodiment, the abnormality condition is that the following three determination criteria are simultaneously satisfied:
the first judgment criterion is as follows: and in a preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-releasing feedback or PDSCH scheduling is not received.
The second judgment criterion is as follows: within a 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.
The third judgment standard: and in 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 the first CQI table according to the CQI reported by the UE at this time, 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 the second CQI table according to the CQI reported by the UE at this time are smaller than a second threshold value R2. The second threshold value R2 ranges from 0 to 1.
Assuming that the UE receives MCS =5 at a predetermined time, since CQIs of 2 th to 15 th of the first CQI table are mapped one-to-one with MCSs of 0 th to 13 th of the MCS table, the UE selects the first CQI table to map a CQI corresponding to a current SNR of the UE. Assuming that the current SNR of the UE is SNR 3, the corresponding CQI =3, and the UE reports CQI =3 to the base station.
Assuming that the UE does not receive the MCS within the predetermined time, selecting a default CQI table (a first CQI table or a second CQI table), mapping a CQI corresponding to the current SNR of the UE, assuming that the default CQI table is the first CQI table and the current SNR of the UE is SNR 5, then corresponding CQI =5, and reporting the CQI =5 to the base station by the UE.
Assuming that the base station determines that there is no abnormality after receiving CQI =3, the base station selects a CQI table used for the last downlink PDSCH scheduling, that is, a first CQI table. Then mapping code rate =0.1543 corresponding to CQI =3, mapping MCS =1 corresponding to code rate =0.1543 according to the MCS table, selecting corresponding downlink PDSCH scheduling according to MCS =1, and sending MCS =1 for next downlink PDSCH scheduling to the UE.
If there is an abnormality, another CQI table different from the CQI table selected in the previous downlink PDSCH scheduling, that is, the second CQI table, is selected, a code rate =0.6426 corresponding to CQI =3 is mapped, MCS =16 corresponding to code rate =0.6426 is mapped according to the MCS table, the corresponding downlink PDSCH scheduling is selected through MCS =16, and MCS =16 is transmitted to the UE for the next downlink PDSCH scheduling.
Besides the code rates in the tables shown in fig. 3, 4 and 5, other code rates can be set by those skilled in the art without affecting the implementation of the present invention. In addition, the mapping relationship between the first CQI table, the second CQI table and the MCS table can be set according to actual conditions, and the implementation of the invention is not influenced.
In summary, according to the specification of the 3gpp protocol, the embodiments of the present invention can use the CQI table containing 16 CQI values at most to complete downlink PDSCH scheduling, so as to accurately match the scheduling policy.
The above examples merely represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications, such as combinations of different features in various embodiments, may be made without departing from the spirit of the invention, and these are within the scope of the invention.
Claims (10)
1. A downlink PDSCH scheduling method based on a CQI table is characterized by comprising the following steps:
s1, a base station sends MCS to UE to carry out downlink PDSCH scheduling;
s2, the UE judges whether the MCS is received within preset time, if so, a table matched with the MCS is selected from preset CQI tables, and the CQI corresponding to the current SNR of the UE is mapped; if not, mapping the 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 or not according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to the CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if so, selecting another CQI table different from the CQI table selected by the last downlink PDSCH scheduling, mapping a code rate corresponding to the CQI, mapping an 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 method for downlink PDSCH scheduling according to claim 1, wherein the first CQI table and the second CQI table each comprise 16 CQI, SNR and code rate.
3. The method for scheduling downlink PDSCH based on CQI table according to claim 2, wherein CQI of 2 nd to 15 th in the first CQI table is one-to-one mapped with MCS of 0 th to 13 th in the MCS table; mapping the 2 nd to 15 th code rates with the 0 th to 13 th code rates of the MCS table one by one; mapping the CQI of the 0 th to the 1 st MCS with the MCS of the 0 th MCS table; the code rate of the 0 th item to the 1 st item is less than the code rate of the 2 nd item;
the CQI of the 0 th to the 15 th items of the second CQI table and the CQI of the 13 th to the 28 th items of the MCS table are mapped one by one; the code rates of items 0 to 15 are mapped one to one with the code rates of items 13 to 28 of the MCS table.
4. The downlink PDSCH scheduling method according to claim 2, wherein the abnormal condition is that the following three judgment criteria are satisfied simultaneously:
the first judgment criterion is as follows: in the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-releasing feedback or PDSCH scheduling is not received;
the second judgment criterion is as follows: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
the third judgment standard: 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 by mapping from the first CQI table according to the CQI reported by the UE at this time, and the absolute value Y of the difference value between the X0 and the code rate Xb obtained by mapping from the second CQI table according to the CQI reported by the UE at this time are smaller than a second threshold R2.
5. The CQI table based downlink PDSCH scheduling method according to claim 4, wherein the second threshold R2 is in the range of 0 to 1.
6. A system for scheduling downlink PDSCH based on CQI table is characterized by comprising a base station and UE;
the base station comprises a first downlink PDSCH scheduling unit, and the first downlink PDSCH scheduling unit is used for sending MCS to UE (user equipment) and performing downlink PDSCH scheduling; analyzing the CQI reported by the UE, and judging whether the CQI is abnormal or not according to a preset abnormal condition; if not, mapping a code rate corresponding to the CQI according to the CQI table selected by the last downlink PDSCH scheduling, mapping an MCS corresponding to the code rate according to the MCS table, and selecting the corresponding downlink PDSCH scheduling through the MCS; if so, selecting another CQI table different from the CQI table selected by the last downlink PDSCH scheduling, mapping a code rate corresponding to the CQI, mapping an 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 an MCS sent by a base station is received within preset time, if so, a CQI table matched with the MCS is selected from preset CQI tables, and the CQI corresponding to the current SNR of the UE is mapped; if not, mapping the 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 CQI table based downlink PDSCH scheduling according to 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 according to claim 7, wherein the CQI of the 2 nd to 15 th CQI tables of the first CQI table is one-to-one mapped with the MCS of the 0 th to 13 th MCS tables of the MCS table; the code rates of the 2 nd to 15 th are respectively mapped with the code rates of the 0 th to 13 th of the MCS table one by one; mapping the CQI of the 0 th to the 1 st MCS with the MCS of the 0 th MCS table; the code rate of the 0 th item to the 1 st item is less than the code rate of the 2 nd item;
the CQI of the 0 th to the 15 th CQI items of the second CQI table are respectively mapped with the CQI of the 13 th to the 28 th CQI items of the MCS table one by one; 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 in the MCS table one by one.
9. The system for downlink PDSCH scheduling based on CQI table according to claim 7, wherein the abnormal condition is that the following three criteria are satisfied simultaneously:
the first judgment criterion is as follows: in the preset time, the response message received by the last downlink PDSCH scheduling is PDSCH error-releasing feedback or PDSCH scheduling is not received;
the second judgment criterion is as follows: in the preset time, the average moving speed of the UE is smaller than a preset first threshold value R1;
the third judgment standard: 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 by mapping from the first CQI table according to the CQI reported by the UE at this time, and the absolute value Y of the difference value between the X0 and the code rate Xb obtained by mapping from the second CQI table according to the CQI reported by the UE at this time are more than or equal to a second threshold value R2.
10. The system for downlink PDSCH scheduling based on CQI table of claim 9, wherein the second threshold R2 ranges from 0 to 1.
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