D2D Signal Collision Management via Subframe Priority and DTX
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Solution Overview
Problem
In wireless communication systems, collisions occur due to overlap between subframes, leading to resource shortages and inefficiencies, particularly in device-to-device (D2D) communication, where subframes with different priorities and timing advance (TA) values cause signal collisions and power limitations in carrier aggregation scenarios.
Innovation Solution
A method for transmitting and receiving D2D signals in wireless communication systems involves allocating resources to subframes based on priority rules, applying TA values to determine discontinuous transmission (DTX) and dropping signals in overlap sections, and using puncturing, rate matching, or ending gaps to manage collisions, ensuring efficient signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subframes are allocated for both D2D communication and cellular communication, then resource utilization is improved, but signal collisions occur due to overlap between subframes
Solution Approach 1:
The patent segments subframes into different types (first subframes for D2D communication, second subframes for cellular communication) and applies different processing rules to each segment. When overlap occurs, the patent selectively drops signals in the overlap section or applies discontinuous transmission (DTX) to specific segments, thereby resolving the contradiction between resource utilization and signal reliability through structured segmentation of communication resources.
2Reliability
If priority rules are applied to resolve subframe overlaps, then signal collision is reduced, but system complexity increases due to priority management
Solution Approach 1:
The patent applies local quality by assigning different priority levels and processing rules to different subframe types and sections. Specifically, first subframes (D2D) and second subframes (cellular) have different priority attributes, and the overlap section has distinct handling rules compared to non-overlap sections. This localized differentiation resolves signal collisions through context-specific priority management rather than uniform system-wide complexity.
3Reliability
If discontinuous transmission (DTX) is applied in overlap sections, then signal collision is resolved, but transmission efficiency decreases
Solution Approach 1:
The patent applies partial action by implementing DTX selectively only in the overlap section of subframes rather than across the entire subframe or system. This partial application of DTX resolves signal collisions in the critical overlap region while maintaining continuous transmission in non-overlap sections, thereby balancing reliability improvement with transmission efficiency preservation.
4Measurement precision
If timing advance (TA) values are applied to determine DTX length, then signal synchronization is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring TA values and their corresponding DTX length mappings before actual communication occurs. The system establishes predetermined relationships between TA values and DTX durations, allowing the terminal to directly determine DTX length based on received TA values without complex real-time calculations, thus improving synchronization precision while limiting processing complexity through advance preparation.
Data Source
AI summary
A method for transmitting and receiving a device-to-device (D2D) signal in a wireless communication system supporting D2D communication, which is performed by a first terminal, includes transmitting and receiving a signal to and from a second terminal through a frame including at least one of a first subframe to which resource related to D2D communication has been allocated and a second subframe to which resource related to cellular communication has been allocated, wherein when overlapping occurs between first subframes or between the first subframe and the second subframe, transmission and reception of a signal in an overlap section or in a subframe including the overlap section is dropped.