NR V2X PSFCH Transmission Power Prioritization
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Solution Overview
Problem
In Next Generation Radio (NR) sidelink communication, User Equipments (UEs) face challenges with power limitations during Physical Sidelink Feedback Channel (PSFCH) transmissions, leading to potential omission of lower priority channels, especially when multiple transmissions overlap in the time domain, causing priority conflicts and inefficient resource usage.
Innovation Solution
A method where a UE determines and transmits only the highest priority PSFCHs based on the available transmit power, selecting N PSFCHs from among the maximum number of transmissions, ensuring that the transmit power for these channels does not exceed the maximum power capacity, thereby prioritizing high-priority transmissions and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs multiple PSFCH transmissions, then communication reliability is improved, but power consumption exceeds maximum transmit power capacity
Solution Approach 1:
The patent applies partial action by selecting only the highest priority PSFCH transmissions to perform when power is limited. Instead of attempting all transmissions, the UE performs a subset (N PSFCHs) that fits within the maximum transmit power capacity, prioritizing the most critical feedback signals for maintaining communication reliability under power constraints.
Solution Approach 2:
The patent changes the parameter of transmit power allocation dynamically. The UE determines N based on the sum of power required for PSFCH transmissions and compares it against the maximum transmit power capacity. This parameter adjustment allows the system to adapt to varying power conditions while ensuring critical communications are maintained.
2Loss of information
If the UE transmits all PSFCHs, then feedback completeness is improved, but power limitations cause transmission omission
Solution Approach 1:
The patent applies partial action by transmitting only the essential PSFCHs when power is constrained. The UE determines the number of PSFCHs to transmit (N) based on power availability, ensuring that the most critical feedback information is conveyed while avoiding power violations that would cause transmission omission.
Solution Approach 2:
The patent uses feedback mechanisms where the receiving UE provides feedback information about received PSFCHs. This feedback loop allows the transmitting UE to understand which transmissions were successful and adjust future transmission decisions, ensuring feedback completeness is maximized within power constraints.
3Loss of energy
If priority-based transmission selection is implemented, then power efficiency is improved, but channel overlap conflicts arise
Solution Approach 1:
The patent applies partial action by selecting only the highest priority PSFCH transmissions when power is limited. Instead of attempting all transmissions, the UE performs a subset (N PSFCHs) that fits within the maximum transmit power capacity, prioritizing the most critical feedback signals for maintaining communication reliability under power constraints.
Solution Approach 2:
The patent applies preliminary action by determining the priority levels and power requirements of PSFCH transmissions before actual transmission occurs. The UE pre-calculates the sum of power required for all PSFCHs and compares it against the maximum transmit power capacity, making advance decisions about which channels to transmit based on priority rankings.
Data Source
AI summary
A method for a first device to perform wireless communication is proposed. The method may comprise: receiving at least one physical sidelink control channel (PSCCH); receiving at least one physical sidelink shared channel (PSSCH) related to the at least one PSCCH; determining a resource related to at least one physical sidelink feedback channel (PSFCH) based on an index of a slot and an index of a subchannel related to at least one PSSCH; determining N PSFCHs from among the at least one PSFCH based on a sum of power required to transmit the at least one PSFCH being greater than a maximum transmit power of the first device, wherein N is selected from a number of PSFCH transmissions with high priority among a maximum number of PSFCH transmissions, to the maximum number of the PSFCH transmissions.