Synchronization Method for Internet of Vehicles Using Target Sequence Mapping
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Solution Overview
Problem
In the 5G-based Internet of Vehicles technology, existing synchronization methods that rely on downlink synchronization signals from base stations fail to meet the requirements for synchronizing data signals between user equipment, particularly in higher frequency bands, leading to issues with frequency offset estimation and timing synchronization.
Innovation Solution
A synchronization method where a target sequence is mapped to symbols within a time unit, including a cyclic prefix, allowing receiving devices to synchronize data signals using a known sequence, thereby ensuring accurate synchronization across devices in the Internet of Vehicles system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink synchronization signal from base station is used, then synchronization can be performed in LTE system, but it cannot meet the synchronization requirements in 5G NR technology at higher frequency bands
Solution Approach 1:
Instead of using downlink synchronization signal from base station (traditional approach), the patent inverts the approach by having transmitting UE embed a target sequence directly in the uplink data signal for synchronization. This allows receiving UE to synchronize based on the transmitted data signal itself, making the system adaptable to higher frequency bands where base station downlink synchronization is insufficient.
Solution Approach 2:
The transmitting UE generates and transmits a target sequence that enables the receiving UE to perform synchronization autonomously using the received data signal. This self-service mechanism eliminates dependency on base station downlink synchronization signals, allowing the system to operate independently in device-to-device communication scenarios at higher frequency bands.
2Measurement precision
If target sequence is mapped to multiple symbols including cyclic prefix, then synchronization precision is improved, but signal overhead increases
Solution Approach 1:
The target sequence is mapped to the first symbol including cyclic prefix before data transmission. This preliminary placement allows receiving UE to perform synchronization at the beginning of the time unit, establishing timing and frequency reference before actual data reception, thereby improving synchronization precision without requiring continuous synchronization signals throughout the transmission.
Solution Approach 2:
The patent concentrates the synchronization function in the first symbol with cyclic prefix rather than distributing it uniformly across all symbols. This local quality approach places the target sequence strategically where it can provide maximum synchronization benefit while minimizing overall overhead, as subsequent symbols can rely on this initial synchronization reference.
Data Source
AI summary
A synchronization method includes: determining a data signal, where a target sequence in the data signal is mapped to at least one symbol that includes the first symbol within a time unit, data in the data signal is mapped to at least one another symbol in the time unit other than the at least one symbol, the first symbol includes a cyclic prefix, and the target sequence is used by a second device to synchronize the data signal; and sending the data signal to the second device in the time unit. In the present disclosure, a sequence used to synchronize a data signal for each transmission is mapped at an equal spacing to at least one symbol that includes the first symbol within a time unit for the current transmission.