MCS Index List Adaptation for Reliable Vehicle Wireless Links
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Solution Overview
Problem
The increasing complexity of vehicle functions and communication nodes in intelligent terminals requires improved flexibility and reliability in wireless communication data transmission, particularly in vehicle-mounted systems where channel conditions are frequency selective and time-varying.
Innovation Solution
A method and apparatus that dynamically adjust modulation modes based on predefined MCS information sets, allowing nodes to select modulation schemes with varying spectral efficiency and code rates, optimizing data transmission based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed modulation mode is used for data transmission, then the system is simple to implement, but the flexibility to adapt to changing channel conditions is poor
Solution Approach 1:
The patent implements dynamic modulation mode selection by establishing a correspondence relationship between MCS indexes and modulation modes, allowing the system to switch between different modulation modes (e.g., QPSK, 16QAM, 64QAM) based on real-time channel conditions. This dynamic adaptation resolves the contradiction by enabling flexibility without requiring complex manual intervention.
Solution Approach 2:
The patent changes the modulation mode parameter based on channel conditions by using MCS index tables that map different modulation modes to specific spectral efficiency and code rate combinations. This parameter change mechanism allows the system to optimize transmission performance while maintaining manageable complexity through standardized parameter sets.
2Productivity
If higher order modulation modes are used, then the transmission efficiency is improved, but the reliability under poor channel conditions deteriorates
Solution Approach 1:
The patent implements feedback-based modulation selection where the receiving end reports channel quality information (CQI) back to the transmitting end. Based on this feedback, the system selects appropriate MCS indexes that correspond to reliable modulation modes, ensuring both efficiency and reliability by adapting to actual channel conditions rather than using fixed high-order modulation.
Solution Approach 2:
The patent uses predefined MCS information sets that contain multiple combinations of modulation modes, spectral efficiency, and code rates. By selecting different parameter combinations from these sets based on channel conditions, the system can achieve high transmission efficiency when channels are good while maintaining reliability when channels deteriorate, resolving the trade-off between productivity and reliability.
3Adaptability or versatility
If multiple service types with different transmission requirements are supported, then the system versatility is improved, but the complexity of managing different transmission parameters increases
Solution Approach 1:
The patent creates a universal MCS index table structure that can support multiple service types (e.g., voice, video, data) with different transmission requirements through a single standardized framework. The table maps different service types to appropriate modulation modes and code rates, allowing the system to handle diverse services without requiring separate complex management mechanisms for each service type.
Data Source
AI summary
An information transmission method and apparatus, applied to the communication field, and in particular, to the short-range communication field, for example, a vehicle-mounted wireless communication system are provided. The method includes: A first node receives a first MCS index from a second node. The first MCS index corresponds to a first modulation mode. The first node receives data from the second node or sends data to the second node based on the first MCS index. A first MCS information subset in which the first MCS index is located belongs to a predefined MCS information set including 32 MCS information subsets.