D2D Synchronization Signal Hop Count Detection in Wireless Systems
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Solution Overview
Problem
The technical challenge lies in the transmission of device-to-device (D2D) synchronization signals and control signals, as well as the multiplexing of D2D synchronization signals in wireless communication systems, which current technologies struggle to efficiently manage, leading to potential errors and resource inefficiencies.
Innovation Solution
A method and apparatus for receiving D2D control information in a wireless communication system, where a user equipment (UE) receives a D2D synchronization signal sequence, determines the hop count, and decides the transmission location of D2D control information, allowing for accurate reception of D2D control information without separate signaling, and employing time-division multiplexing of D2D synchronization signals with different hop counts within a subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If D2D synchronization signals are transmitted without structured hop count management, then transmission simplicity is maintained, but reception accuracy and resource efficiency deteriorate
Solution Approach 1:
The patent segments D2D synchronization signals into multiple sequences with different hop counts (0, 1, 2, ...). Each sequence is transmitted in a specific subframe according to a predetermined pattern. This segmentation allows the receiving UE to identify and process signals based on hop count, improving reception accuracy while maintaining manageable system complexity through structured organization.
Solution Approach 2:
The patent establishes predetermined relationships between subframes and hop counts before actual D2D communication occurs. The UE is pre-configured with the mapping between subframe indices and expected hop counts, allowing it to efficiently determine which synchronization signal sequences to expect and how to interpret received signals, thereby improving reception accuracy without requiring complex real-time decision-making.
2Reliability
If separate signaling is used for each hop count, then transmission accuracy is improved, but signaling overhead and resource consumption increase
Solution Approach 1:
The patent merges the hop count indication into the physical layer signal structure itself rather than using separate higher-layer signaling. The hop count is implicitly conveyed through the subframe timing and sequence index, allowing the UE to determine hop count information from the received signal's temporal and spectral characteristics without requiring additional dedicated signaling resources.
Solution Approach 2:
The D2D synchronization signal structure is designed to be self-descriptive, where the signal's own characteristics (subframe position, sequence index) encode the hop count information. The receiving UE extracts hop count by analyzing these inherent signal properties, making the system self-sufficient and eliminating the need for separate control signaling for hop count indication.
3Productivity
If D2D synchronization signals are transmitted in all subframes, then signal availability is improved, but resource efficiency and power consumption worsen
Solution Approach 1:
The patent implements periodic transmission of D2D synchronization signals where UEs transmit synchronization sequences in specific subframes according to a predetermined periodic pattern based on their hop count. Instead of continuous transmission, each UE transmits only in its assigned subframes, reducing overall power consumption while maintaining signal availability for UEs that need to synchronize at those periodic intervals.
Solution Approach 2:
The system dynamically assigns different transmission subframes to different UEs based on their hop count values. This dynamic time-division multiplexing approach ensures that synchronization signals are distributed across different time resources, improving overall system efficiency by allowing multiple UEs to transmit without collision while reducing the burden on individual UEs to transmit continuously.
Data Source
AI summary
According to one embodiment of the present invention, a method for receiving device-to-device (D2D) control information at a user equipment (UE) in a wireless communication system, the method comprising receiving a subframe; receiving a D2D synchronization signal sequence transmitted on the subframe; deciding a hop count of the D2D synchronization signal sequence from an index of the D2D synchronization signal sequence; deciding a transmission location of D2D control information corresponding to the decided hop count; and receiving the D2D control information at the decided transmission location.