Sidelink Communication Modulation and Period Adaptation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving distance- and/or location-related information between terminals, particularly due to signal quality degradation at long distances and the need for precise location checks, which affects data rate and accuracy.
Innovation Solution
A method and apparatus for sidelink communication where the transmission period and modulation order are adjusted based on the distance between terminals, with higher modulation orders used for closer terminals and lower orders for farther ones, allowing for efficient transmission of distance- and/or location-related information by configuring sidelink messages with upper and lower bits, and modulating using schemes like QPSK and 16-QAM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher modulation orders are used for transmission, then data rate is improved, but signal quality deteriorates at long distances
Solution Approach 1:
The patent applies dynamic modulation order adjustment based on distance. The modulation order is changed from static to dynamic, where higher modulation orders (e.g., 16-QAM, 64-QAM) are used for short-distance transmissions to maximize data rate, while lower modulation orders (e.g., QPSK, BPSK) are used for long-distance transmissions to maintain signal quality. This dynamic adaptation resolves the contradiction between data rate and signal quality.
Solution Approach 2:
The patent changes the modulation order parameter based on transmission distance. By adjusting this key parameter dynamically, the system optimizes the trade-off between data rate and signal quality. The modulation order serves as a controllable parameter that can be modified to match channel conditions, thereby resolving the technical contradiction.
2Measurement precision
If transmission period is shortened to improve location accuracy, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic transmission period adjustment based on distance and location requirements. For close terminals where high location accuracy is needed, the transmission period is shortened. For far terminals or when location accuracy requirements are lower, the transmission period is extended. This dynamic adjustment optimizes the balance between measurement precision and energy consumption.
Solution Approach 2:
The transmission period parameter is changed dynamically according to distance and location accuracy requirements. This parameter adjustment allows the system to achieve optimal location accuracy while minimizing energy consumption by avoiding unnecessarily frequent transmissions when high precision is not required.
3Productivity
If different modulation orders are used for upper and lower bits, then information transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the information bits into upper bits and lower bits, applying different modulation orders to each segment. This segmentation allows independent optimization of modulation schemes for different bit positions, improving overall information transmission efficiency while managing complexity through structured bit allocation.
Solution Approach 2:
The patent applies local quality by assigning different modulation characteristics to different bit positions. Upper bits may use more robust modulation while lower bits use higher-order modulation for greater data capacity. This localized optimization improves transmission efficiency without requiring complete system redesign.
Data Source
AI summary
Disclosed are a method and a device for performing sidelink communication in a wireless communication system. Specifically, the method performed by a first terminal may comprise a step of transmitting a specific sidelink message including at least one piece of information among first information and second information to a second terminal, wherein: a transmission period of the first information is set to be longer than a transmission period of the second information; a first modulation order to be applied to the first information and a second modulation order of the second information are set differently from each other; and when the first information and the second information are concurrently transmitted through the specific sidelink message, modulation symbols of the first information and modulation symbols of the second information are mapped by considering a requirement noise ratio for each of the first modulation order and the second modulation order.