Adaptive Modulation Coding Punctured PRB Conversion
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Solution Overview
Problem
The existing LTE system's TBS table is not directly applicable to punctured PRB resources, leading to inefficiencies in spectrum transmission and potential decoding errors due to the inability to choose the optimal transmission format based on channel quality.
Innovation Solution
An adaptive modulation and coding method that converts the number of punctured PRB pairs to normal PRB pairs, allowing the use of existing TBS and MCS tables to improve spectrum efficiency by selecting the appropriate modulation scheme and Transport Block Size for downlink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the existing TBS table designed for normal PRB is used for punctured PRB, then the system can maintain simplicity in table structure, but the spectrum transmission efficiency decreases and decoding errors occur
Solution Approach 1:
The patent introduces a conversion parameter K that transforms the number of punctured PRB pairs into an equivalent number of normal PRB pairs. This parameter change enables the system to use the existing TBS table for punctured PRB scenarios, resolving the contradiction by maintaining table simplicity while achieving correct TBS selection for punctured resources.
Solution Approach 2:
The patent uses the conversion parameter K as an intermediary between punctured PRB pairs and normal PRB pairs. This intermediary element allows the system to bridge the gap between the existing table structure (designed for normal PRB) and the actual punctured PRB resources, enabling correct TBS determination without modifying the original table.
2Device complexity
If the existing TBS table is used for punctured PRB, then the system structure remains simple, but the ability to choose optimal transmission format based on channel quality is lost
Solution Approach 1:
By introducing the conversion parameter K that maps punctured PRB pairs to normal PRB pairs, the system maintains its ability to adapt transmission formats based on channel quality. The existing TBS table, which is adapted to channel conditions, remains usable through this parameter transformation, preserving adaptability without increasing structural complexity.
3Device complexity
If punctured PRB resources are not properly handled, then the system can avoid complex conversion mechanisms, but spectrum utilization efficiency decreases
Solution Approach 1:
The patent applies parameter change by introducing conversion parameter K to transform punctured PRB pair counts into equivalent normal PRB pair counts. This enables correct TBS selection that matches the actual available resources in punctured PRB, thereby optimizing spectrum utilization efficiency without requiring complex new tables or mechanisms.
Data Source
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AI summary
An adaptive modulation and coding method is provided by the present invention, comprising: selecting punctured Physical Resource Blocks (PRBs) to transmit the downlink data for the User Equipment (UE); determining the Transport Block Size (TBS) and the number of punctured PRB pairs for transmission to the UE based on the carried service; scheduling the downlink data for the UE based on the determined TBS, and transmitting the number of the used punctured PRB pairs and a Modulation and Coding Scheme (MCS) sequence number to the UE; and the UE converting the number of the punctured PRB pairs to the number of normal PRB pairs, determining the modulation scheme and the TBS sequence number based on the MCS sequence number, and determining the TBS of the downlink data based on the number of the normal PRB pairs and the TBS sequence number. The specific condition when downlink data are transmitted with punctured PRBs may be performed in the present invention on the basis of utilizing the existing resources and adaptive processing of the general subframes by performing conversion between the number of punctured PRBs and the number of normal PRBs in scheduling resource for the UE with the NodeB, which may be implemented simply and efficiently.