Modulation and Coding Scheme Table Configuration for Wireless Signaling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signaling channel conditions and modulation and coding schemes, particularly when supporting higher modulation orders, as increased table sizes lead to overhead and reduced network efficiency.
Innovation Solution
The implementation of configuration and signaling methods that utilize parameter tables to map modulation and coding scheme indices to modulation orders and code rates, allowing efficient switching between tables based on frequency ranges and reference signal configurations, without increasing control information overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If larger parameter tables are used to support higher modulation orders, then communication reliability and data rates are improved, but control information overhead increases
Solution Approach 1:
The parameter tables are segmented into multiple subsets, each supporting different modulation orders. Instead of using a single large table that supports all modulation orders (which would increase overhead), the system divides the parameter space into smaller manageable subsets. The base station selects and transmits only the relevant subset based on current channel conditions and modulation requirements, thereby maintaining high communication reliability while minimizing control information overhead.
Solution Approach 2:
The system dynamically selects which parameter table subset to use based on real-time channel conditions and modulation order requirements. The base station determines the appropriate subset and signals this selection to the UE through control information. This dynamic adaptation allows the system to use larger, more reliable parameter tables when high modulation orders are needed, while switching to smaller subsets when lower modulation orders suffice, thus optimizing the trade-off between reliability and overhead.
2Adaptability or versatility
If multiple parameter tables are configured for different modulation orders, then adaptability is improved, but device complexity increases
Solution Approach 1:
The multiple parameter tables are segmented into distinct subsets, each dedicated to specific modulation orders. This segmentation allows the UE to maintain multiple smaller lookup tables rather than one enormous table, reducing memory requirements and processing complexity. The base station indicates which subset to use, allowing the UE to focus processing on only the relevant subset at any given time, thereby improving adaptability while managing device complexity.
Solution Approach 2:
The parameter tables are pre-configured and stored in the UE before actual communication occurs. The UE receives configuration information from the base station that includes the parameter tables, preparing the device in advance with the necessary lookup data. This preliminary configuration reduces real-time processing complexity during actual transmissions, as the UE can simply perform table lookups rather than calculating parameters on the fly.
3Productivity
If parameter tables are frequently updated to reflect changing channel conditions, then communication efficiency is improved, but power consumption increases
Solution Approach 1:
Instead of continuously updating parameter tables in response to every channel condition change, the system employs periodic updates at strategically determined intervals. The base station determines when updates are necessary based on channel condition changes and transmits updated parameter table subsets at these periodic intervals. This approach maintains high communication efficiency by keeping tables current when needed, while reducing power consumption by avoiding unnecessary continuous updates and processing.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for indicating modulation order and code rate for transmissions between a user equipment (UE) and a base station. The base station may configure one or more parameter tables that provide mapping between a modulation and coding scheme (MCS) index and the modulation order and code rate. The one or more tables may be explicitly indicated in configuration signaling, may be configured based on a frequency range for communications or a reference signal configuration, or any combinations thereof. The base station may transmit control information to the UE that indicates the MCS index value and that indicates a first table of multiple configured tables is to be used to determine the modulation order and code rate.