Air Terminal Transmit Power Control for Inter-Cell Interference
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Solution Overview
Problem
Current D2D communication methods in wireless transmission, particularly for air communication scenarios, face significant inter-cell interference due to the Line of Sight (LOS) between air terminals and ground stations, which existing transmit power control methods fail to adequately address, leading to inefficiencies in transmission rates and spectrum usage.
Innovation Solution
A method for determining transmit power values in wireless communication devices that considers interferences to neighbor cells and ground terminals, using multiple downlink radio signals with distinct synchronization sequences to minimize inter-cell interference, allowing for efficient transmission on channels like Physical Sidelink Shared Channel (PSSCH) or Physical Uplink Control Channel (PUCCH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional D2D transmit power control methods are used based on path loss between transmitting end and serving cell, then transmission robustness is improved, but large inter-cell interferences are generated to neighbor cells and ground terminals
Solution Approach 1:
The patent applies local quality by determining different transmit power values for different transmission directions and target regions. Specifically, the air terminal device determines a first transmit power value for transmission toward a first region and a second transmit power value for transmission toward a second region, where these power values differ based on the specific interference characteristics of each region. This allows the system to optimize transmission locally for each direction while minimizing interference to specific neighbor cells and ground terminals.
Solution Approach 2:
The patent segments the transmission space into multiple regions based on the locations of neighbor cells and ground terminals. By dividing the coverage area into distinct regions and assigning different transmit power values to each region, the system can control interference separately for each segment. This segmentation approach enables the air terminal to transmit with higher power in some directions while using lower power in other directions where interference would be harmful.
2Productivity
If transmit power is increased to improve transmission rate, then communication efficiency is improved, but interference to multiple regions and ground terminals increases
Solution Approach 1:
The patent implements local quality by assigning different transmit power values to different spatial regions. The air terminal device determines a first transmit power value for transmission toward a first region and a second transmit power value for transmission toward a second region, where the power values are differentiated based on interference characteristics. This allows the system to maximize transmission rate in directions with acceptable interference levels while limiting power in directions where interference would be harmful.
Solution Approach 2:
The patent applies dynamics by making the transmit power value adjustable and adaptive based on transmission conditions. The air terminal device dynamically determines transmit power values considering factors such as the locations of neighbor cells, ground terminals, and current communication requirements. This dynamic power adjustment enables the system to optimize transmission rate in real-time while adapting to changing interference conditions in different regions.
3Adaptability or versatility
If conventional TPC methods are used for air communication, then compatibility with LTE D2D protocols is maintained, but large inter-cell interferences are produced to neighbor cells
Solution Approach 1:
The patent applies local quality by determining different transmit power values for different transmission directions and target regions. Specifically, the air terminal device determines a first transmit power value for transmission toward a first region and a second transmit power value for transmission toward a second region, where these power values differ based on the specific interference characteristics of each region. This allows the system to optimize transmission locally for each direction while minimizing interference to specific neighbor cells and ground terminals.
Solution Approach 2:
The patent segments the transmission space into multiple regions based on the locations of neighbor cells and ground terminals. By dividing the coverage area into distinct regions and assigning different transmit power values to each region, the system can control interference separately for each segment. This segmentation approach enables the air terminal to transmit with higher power in some directions while using lower power in other directions where interference would be harmful.
Data Source
AI summary
The disclosure provides a method and a device in a User Equipment (UE) and a base station for terminal-to-terminal communication. The UE first receives K downlink radio signals, and then transmits a first radio signal. A transmit power value of the first radio signal is a first power value. The K downlink radio signals are associated with K synchronization sequences respectively. The downlink radio signal includes at least one of a downlink reference signal or a synchronization signal, or the downlink radio signal includes a downlink signaling. The K downlink radio signals are used for determining the first power value. Any two of the K synchronization sequences are different. The K is a positive integer greater than 1. A relationship is established between the first power value and the K downlink radio signals, ensuring that transmissions of the UE will not produce strong interferences to neighbor cells.