D2D Scheduling Assignment Resource Mapping via Persistent Table
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Solution Overview
Problem
In Device-to-Device (D2D) communication, the existing systems face challenges in efficiently conveying scheduling assignment information for D2D data resources, leading to a reduction in available radio resources due to the large amount of information required to indicate time-frequency locations.
Innovation Solution
A user terminal and processor configuration that determines the frequency location of D2D data resources based on a persistent table correlating SA and data resource frequencies, and the time location based on an identifier within the scheduling assignment information, reducing the need for direct information in SA and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If scheduling assignment information directly indicates the time-frequency location of D2D data resources, then the location information is explicitly conveyed, but the amount of information in SA increases and radio resources are consumed
Solution Approach 1:
The patent introduces an intermediary mechanism where SA carries an identifier (such as a index value or hash result) that indirectly points to the time-frequency location of D2D data resources. This identifier acts as a mediator between the SA and the actual resource location, allowing the receiver to determine the exact location through predefined mapping relationships without transmitting the full location information in SA.
Solution Approach 2:
The patent transforms the direct time-frequency location indication into a different dimensional representation by using identifiers or index values. Instead of conveying the complete time and frequency coordinates directly, the system uses a compressed identifier that maps to the resource location through predetermined relationships, effectively changing the dimension of information representation.
2Productivity
If more radio resources are allocated for D2D data transmission, then the data transmission capacity increases, but the available resources for other purposes decrease and interference increases
Solution Approach 1:
The patent extracts the location indication information from the SA and places it in a separate predetermined relationship (such as a mapping table or algorithm). This separation allows SA to contain only essential control information while the detailed location information is derived externally, reducing the information burden on SA and enabling more efficient resource allocation.
3Quantity of substance
If the information amount in SA is reduced, then radio resources are saved, but the ability to accurately indicate D2D data resource location deteriorates
Solution Approach 1:
The patent establishes predetermined relationships (mapping tables, algorithms, or lookup structures) before D2D communication occurs. These preliminary structures enable the receiver to accurately determine time-frequency locations from compact identifiers contained in SA, ensuring precise location indication is maintained even though the actual information transmitted in SA is minimized.
Data Source
AI summary
A user terminal according to present embodiment comprises a transmitter configured to transmit scheduling assignment information indicating a time-frequency location of a D2D data resource by which user data in D2D communication that is direct Device to Device communication is transmitted. The frequency location of the D2D data resource is determined on the basis of a persistent table where the frequency location of the D2D data resource and the frequency location of the scheduling assignment information are made to correspond to each other. The time location of the D2D data resource is determined on the basis of an identifier included in the scheduling assignment information.