Modulation and Coding Scheme Table Selection for Wireless Power Efficiency
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Solution Overview
Problem
Current wireless communication systems face challenges in maximizing power efficiency and spectral efficiency, particularly in selecting optimal modulation and coding schemes based on network conditions and user equipment (UE) priorities, leading to suboptimal performance in lightly and heavily loaded networks.
Innovation Solution
A method and apparatus for determining a priority indicator for wireless communications, which includes transmitting this indicator to a base station to receive control information for downlink transmissions, and identifying a combination of modulation order and code rate based on the priority indicator and network conditions, allowing for selection from multiple sets of modulation and coding schemes to prioritize power or spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single modulation and coding scheme table is used for all network conditions, then device complexity is reduced, but power efficiency and spectral efficiency are suboptimal under varying network loads
Solution Approach 1:
The patent implements dynamic selection between multiple modulation and coding scheme tables based on network conditions and UE power state. The UE can switch between a first table optimized for power efficiency and a second table optimized for spectral efficiency, allowing the system to adapt to varying network loads without requiring complex real-time optimization algorithms at the UE.
Solution Approach 2:
The patent changes the parameter set by providing multiple predefined modulation and coding scheme tables with different optimization characteristics. Instead of dynamically optimizing parameters at the UE, the system selects from pre-configured tables with different modulation orders, code rates, and redundancy versions, simplifying UE complexity while maintaining adaptability.
2Productivity
If high-order modulation schemes are used to maximize spectral efficiency, then data throughput increases, but power consumption increases
Solution Approach 1:
The patent dynamically selects between modulation and coding scheme tables based on whether the UE is in a powered state or power-saving state. When powered, the UE uses a table optimized for spectral efficiency with higher modulation orders. When in power-saving state, the UE switches to a table optimized for power efficiency with lower modulation orders and more robust coding, reducing power consumption while maintaining acceptable throughput.
Solution Approach 2:
The patent changes modulation order and code rate parameters based on power state. The first table uses parameters optimized for power efficiency (lower modulation orders, more robust coding), while the second table uses parameters optimized for spectral efficiency (higher modulation orders, less robust coding). This parameter switching allows the system to trade off between power consumption and spectral efficiency based on current operational requirements.
3Adaptability or versatility
If multiple modulation and coding scheme tables are maintained for different optimization goals, then flexibility and efficiency are improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic table selection based on simple criteria such as UE power state and network conditions indicated by the network. Rather than requiring complex algorithms to evaluate multiple tables simultaneously, the UE switches between tables based on straightforward state checks, maintaining flexibility while controlling complexity.
Solution Approach 2:
The patent uses pre-configured modulation and coding scheme tables that are established beforehand for different optimization scenarios. This preliminary preparation eliminates the need for complex real-time optimization calculations at the UE, as the device simply selects from pre-optimized tables based on current conditions, reducing computational complexity while maintaining adaptability.
4Reliability
If robust coding schemes are used to ensure reliable reception, then transmission reliability improves, but spectral efficiency decreases
Solution Approach 1:
The patent changes code rate parameters based on power state and network conditions. The first table uses more robust coding schemes with lower code rates that provide better error protection and reliability. The second table uses less robust coding schemes with higher code rates that achieve better spectral efficiency. This parameter switching allows the system to prioritize reliability or spectral efficiency based on current operational requirements.
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured to determine a priority indicator for an upcoming transmission between the UE and a base station and transmit the priority indicator to the base station. The base station may receive the priority indicator, determine a network condition, and may transmit control information for a downlink transmission. The control information may include an indication of a set of modulation and coding schemes to select from a plurality of sets of modulation and coding schemes and an index value for an entry in the selected set of modulation and coding scheme, where the indication is based on the priority indicator and a network condition. The UE may identify a combination of a modulation order and a code rate for the downlink transmission based on the indication of modulation and coding scheme table and the index value.