Multi-Carrier D2D Resource Allocation via Independent Sensing
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Solution Overview
Problem
In wireless communication systems, device-to-device (D2D) communication faces challenges in efficiently transmitting messages on multiple carriers simultaneously due to half-duplex limitations, which restrict the availability of transmission resources and impact system performance.
Innovation Solution
A method for a user equipment (UE) to sense transmission resources independently for each carrier, calculate the ratio of available resources for simultaneous transmission, and select suitable resources based on a predetermined threshold, allowing for simultaneous message transmission on multiple carriers while considering congestion levels and message priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal transmits messages on multiple carriers simultaneously in D2D communication, then data transmission rate and system performance are improved, but half-duplex limitations reduce the availability of transmission resources
Solution Approach 1:
The patent segments the transmission resource selection process into independent sensing operations for each carrier. The terminal senses transmission resources separately on each carrier, calculates the ratio of available resources for simultaneous transmission, and selects candidate resources based on predetermined thresholds. This segmentation allows the system to manage multiple carriers independently while coordinating their simultaneous use, thereby improving data transmission rate without being fully constrained by half-duplex limitations.
2Productivity
If transmission resources are allocated for simultaneous transmission on multiple carriers, then system performance is enhanced, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by having the terminal sense and evaluate transmission resources on each carrier before actual message transmission. The terminal calculates the ratio of available transmission resources in advance, compares it against predetermined thresholds, and identifies candidate transmission resources beforehand. This preliminary resource assessment simplifies the subsequent transmission process by pre-resolving resource allocation decisions, thereby enhancing system performance while managing allocation complexity.
3Productivity
If the terminal selects transmission resources based on sensing results and resource ratios, then transmission efficiency is improved, but the complexity of resource selection increases
Solution Approach 1:
The patent utilizes parameter changes by introducing a predetermined threshold ratio for transmission resource availability. The terminal senses resources on each carrier, calculates the actual ratio of available transmission resources, and compares this parameter against the threshold to determine candidate resources. This parameter-based decision mechanism simplifies resource selection by providing a clear criterion (threshold comparison) while maintaining transmission efficiency through adaptive resource selection based on actual channel conditions.
Data Source
AI summary
According to various embodiments, disclosed are a method by which a terminal simultaneously transmits messages in at least two carriers in a wireless communication system supporting device to device (D2D) communication, and an apparatus therefor. Particularly, disclosed are a method by which a terminal simultaneously transmits messages in at least two carriers, and an apparatus therefor, the method comprising the steps of: independently sensing, by a carrier, a transmission resource, and calculating the ratio of transmission resources, which can be simultaneously transmitted on at least two carriers, on the basis of a result of the sensing by the carrier; setting the sensed transmittable transmission resource as a transmission candidate resource when the calculated transmission resource ratio is greater than or equal to a preset threshold ratio; and selecting a transmission resource to be used for the message transmission in each of at least two carriers within the transmission candidate resource.