MCS Table Configuration for Higher Modulation Orders
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Solution Overview
Problem
The existing LTE/LTE-A systems do not support modulation schemes at higher orders, limiting throughput improvement in scenarios with high signal-to-noise ratios.
Innovation Solution
A method and device for transmitting MCS indication information that introduces modulation schemes at higher orders by determining and notifying UE of MCS levels using a new MCS table with corresponding entries for higher modulation orders, enabling improved spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If modulation schemes at higher orders are not supported in existing LTE/LTE-A systems, then system complexity remains manageable, but throughput is limited in high signal-to-noise ratio scenarios
Solution Approach 1:
The patent introduces dynamic adaptability by enabling the system to switch between different modulation orders (up to 256 QAM) based on channel conditions. The base station can dynamically select and notify the UE of the appropriate modulation order through RRC signaling and MCS indication, allowing the system to adapt to varying signal-to-noise ratio conditions and achieve higher throughput when channel quality permits.
Solution Approach 2:
The patent changes the modulation order parameter from the traditional maximum of 64 QAM to support up to 256 QAM (modulation order 8). This parameter change is implemented through modified MCS tables that include entries for higher modulation orders, and through RRC signaling that configures the UE with the appropriate MCS table and maximum modulation order support, thereby enabling higher spectral efficiency and throughput.
2Productivity
If a new MCS table with higher modulation orders is introduced, then spectrum efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the MCS table into multiple versions, each supporting different maximum modulation orders (e.g., one table for up to 64 QAM, another for up to 256 QAM). The base station configures the UE with a specific MCS table version through RRC signaling based on the UE's capabilities and network conditions. This segmentation allows the system to support higher spectrum efficiency when needed while maintaining compatibility with existing UEs that only support lower modulation orders.
Solution Approach 2:
The patent introduces dynamic configuration where the base station can switch between different MCS table versions and maximum modulation order settings through RRC reconfiguration. The system dynamically adapts the MCS table configuration based on UE capability reporting, channel conditions, and network requirements, allowing flexible optimization of spectrum efficiency without permanently increasing system complexity for all scenarios.
Data Source
AI summary
The present application relates to the field of wireless communications, and in particular, to an indication method and device for a modulation coding scheme. It is for solving the problem that in an existing LTE/LTE-A system, a higher-order modulation scheme cannot be supported, thereby limiting the further improvement of throughput in an application scenario of a high signal-to-noise ratio. The method of the embodiments of the present application includes: according to the channel quality and a first MCS table, a network side determining an MCS level corresponding to a channel scheduled for a UE; and by means of first indication information, notifying the UE of the determined MCS level, so as to indicate to the UE to determine a modulation scheme and code rate for the channel scheduled therefor according to the MCS grade, wherein there are at least corresponding entries of MCS indexes and TBS indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table. The embodiments of the present application introduce a higher-order modulation scheme into an existing LTE/LTE-A system, improving the spectrum efficiency.