D2D Slot Re-indexing for Wireless Signal Synchronization
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Solution Overview
Problem
In wireless communication systems, device-to-device (D2D) communication faces challenges in efficiently transmitting signals due to synchronization issues between cells, leading to subframe index mismatches that affect scrambling sequences and demodulation reference signals (DMRS), resulting in system performance deterioration.
Innovation Solution
The method involves re-indexing D2D slot numbers within the D2D resource pool for signal transmission, using a modulo operation, and generating scrambling sequences and DMRS based on re-indexed slot numbers, with the option to include subframe or slot index offset information to synchronize signals across different serving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D communication uses conventional slot indexing across different serving cells, then device-to-device signal transmission can proceed, but subframe index mismatches occur leading to system performance deterioration
Solution Approach 1:
The patent applies parameter changes by re-indexing D2D slot numbers using a re-indexing parameter. Instead of using conventional slot indexing that causes subframe index mismatches across different serving cells, the system transforms the slot indexing parameter through a re-indexing function. This parameter transformation aligns the slot indices with subframe indices, resolving the mismatch issue and improving system performance without adding significant complexity.
2Reliability
If D2D communication transmits signals without re-indexing slot numbers, then transmission simplicity is maintained, but synchronization issues arise between cells
Solution Approach 1:
The patent implements preliminary action by performing slot number re-indexing before D2D signal transmission. The re-indexing operation is executed in advance to align slot indices with subframe indices across different serving cells. This preliminary transformation prevents synchronization issues from occurring during actual transmission, ensuring reliable signal synchronization while maintaining a relatively simple transmission process.
3Object-generated harmful factors
If conventional scrambling sequences are used without considering slot index alignment, then sequence generation is straightforward, but interference increases due to subframe index mismatches
Solution Approach 1:
The patent applies parameter changes to the scrambling sequence generation process by incorporating the re-indexed slot number as an input parameter. Instead of using conventional scrambling sequences that ignore slot index alignment, the system generates scrambling sequences based on the re-indexed slot numbers. This parameter transformation ensures that scrambling sequences are properly aligned across different serving cells, reducing interference while adding only minimal complexity to the sequence generation process.
Data Source
AI summary
The present invention relates to a method and an apparatus for D2D signal transmission of a first terminal in a wireless communication system. Specifically, the method comprises the steps of: receiving a resource pool configuration indicating a D2D resource pool; and transmitting a D2D data channel on the basis of a D2D slot number which is re-indexed within the D2D resource pool.