V2V Power Measurement Using Fixed OCC and Phase Offset
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently measuring power for vehicle-to-vehicle (V2V) communication, particularly due to insufficient DMRS sequences and phase offset issues caused by frequency errors, which affect synchronization and signal compensation in high-frequency scenarios like 5.9 GHz.
Innovation Solution
A method for measuring power in V2V communication using a V2V device that receives synchronization signals through a physical sidelink broadcast channel (PSBCH) with demodulation reference signals (DMRS) and orthogonal cover codes (OCC), allowing for averaging and phase offset compensation, even when the number of DMRS sequences is limited or phase offsets exceed π.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS sequences are used for power measurement in V2V communication, then synchronization and power measurement capability are improved, but the number of available sequences is insufficient to handle all synchronization signal IDs
Solution Approach 1:
The patent applies parameter changes by modifying the OCC (Orthogonal Cover Code) from a dynamic variable to a fixed value. This allows the system to differentiate between synchronization signal IDs not through multiple DMRS sequences but through the fixed OCC parameter combined with phase offset information, thereby resolving the insufficiency of DMRS sequences while maintaining measurement precision
Solution Approach 2:
The patent introduces phase offset as an intermediary parameter that mediates between the limited DMRS sequences and the need to identify multiple synchronization signal IDs. By using phase offset compensation in combination with the fixed OCC, the system can distinguish between different signal IDs without requiring a proportional increase in DMRS sequence count
2Reliability
If phase offset compensation is performed for frequency errors in high-frequency V2V communication, then synchronization reliability is improved, but measurement accuracy deteriorates when phase offsets exceed π
Solution Approach 1:
The patent applies partial action by using a fixed OCC value rather than attempting to compensate for all possible phase offsets dynamically. This fixed parameter approach provides sufficient differentiation for the intended application scope without requiring complex adaptive mechanisms, thereby maintaining reliability while avoiding the accuracy degradation that would result from over-compensation in high-phase-offset scenarios
3Device complexity
If fixed OCC value is used to differentiate synchronization signal IDs, then device complexity is reduced, but the ability to handle large number of IDs is limited
Solution Approach 1:
The patent applies universality by designing the fixed OCC to serve multiple functions simultaneously: it acts as an orthogonal cover code for channel estimation, serves as a differentiation parameter for synchronization signal ID identification, and provides a basis for phase offset compensation. This multi-functionality allows the simple fixed parameter to handle a practical number of IDs without increasing device complexity
Data Source
AI summary
The present invention relates to a method for electricity measurement by a vehicle-to-vehicle (V2V) device for V2V communications in a wireless communication system and to a device therefor. In particular, the present invention includes the steps of: receiving at least one synchronization signal for V2V through a physical sidelink broadcast channel (PSBCH); and measuring received electricity from said at least one synchronization signal if the ID of said at least one synchronization signal is linked to a demodulation reference signal (DMRS) sequence having, applied thereto, an orthogonal cover code (OCC) having one fixed value, wherein the measurement is performed by means of averaging for each ID of said at least one synchronization signal.