Sidelink Power Allocation for V2X Carrier Aggregation
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Solution Overview
Problem
Efficient vehicle-to-everything (V2X) communication is hindered in power-limited scenarios due to the inability to effectively manage transmission powers across multiple carriers during carrier aggregation in V2X communication systems.
Innovation Solution
A method and apparatus for determining and adjusting transmission powers of sidelink signals on multiple carriers based on packet priorities, sum of transmission powers, and maximum transmission power, involving adjustments to ensure compliance with the maximum power limit, including reducing powers of packets except the highest priority and sequentially reducing powers of lower priority packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased on multiple carriers to improve V2X communication reliability, then communication reliability is improved, but the maximum transmission power limit is exceeded
Solution Approach 1:
The patent changes the transmission power parameter dynamically based on carrier priority, packet priority, and power headroom conditions. Different transmission powers are assigned to different carriers and packets according to their priorities, allowing the system to operate reliably within power limits by adjusting power parameters rather than using a fixed high power level
Solution Approach 2:
The patent applies different transmission power levels to different carriers and packets based on their local priorities. High-priority packets on critical carriers receive higher power allocation, while low-priority packets on non-critical carriers receive lower or zero power allocation, optimizing overall communication reliability within power constraints
2Power
If transmission power is reduced to comply with maximum power limit, then power consumption is controlled, but communication reliability deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power parameters based on power headroom conditions and priority levels. When power headroom is sufficient, higher powers are used to maintain reliability. When power headroom is limited, powers are reduced selectively on lower-priority carriers while maintaining or increasing power on high-priority carriers, thus controlling overall power while preserving critical communication reliability
3Device complexity
If transmission power is uniformly allocated across all carriers, then device complexity is reduced, but communication efficiency decreases in power-limited scenarios
Solution Approach 1:
The patent implements differentiated power allocation where each carrier and packet receives power based on its specific priority and channel conditions. This local optimization approach, while more complex than uniform allocation, significantly improves communication efficiency in power-limited scenarios by concentrating power on critical transmissions rather than spreading it uniformly
Solution Approach 2:
The system uses dynamic parameter changes in power allocation based on priority indicators and power headroom measurements. This allows efficient adaptation to changing conditions without requiring complex real-time optimization algorithms, achieving good communication efficiency with manageable device complexity
4Productivity
If all packets are transmitted simultaneously on multiple carriers, then data transmission rate is increased, but power management becomes infeasible in power-limited cases
Solution Approach 1:
The patent implements a selective transmission strategy where low-priority packets are discarded (not transmitted) when power headroom is insufficient, while high-priority packets are transmitted. This discarding approach simplifies power management in power-limited cases by avoiding the need to transmit all packets simultaneously, while still maintaining feasible power levels and ensuring critical data gets through
Solution Approach 2:
The system dynamically changes transmission parameters including whether to transmit a packet at all, and at what power level, based on priority and power headroom conditions. This parameter adaptation allows the system to maintain high data transmission rates when power is available, while automatically reducing activity when power is limited, making power management feasible
Data Source
AI summary
Provided is a method for a terminal to transmit sidelink signals in a wireless communication system according to one embodiment of the present invention, comprising the steps of: determining transmission power of a sidelink packet in each of a plurality of carriers; and on the basis of the determined transmission power, transmitting the sidelink signals through one or more carriers of the plurality of the carriers, wherein the transmission power is determined on the basis of a priority of the sidelink packet scheduled for transmission on each of the plurality of carriers, a sum of the transmission power of the sidelink packet scheduled for transmission on each of the plurality of carriers, and maximum transmission power of the terminal. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, the BS or a network.