Synchronization Signal Power Control for D2D
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP LTE, face challenges in efficiently transmitting synchronization signals for direct device-to-device communication, particularly in areas with unstable or limited base station coverage, leading to issues with power consumption and interference.
Innovation Solution
A method for configuring power parameters of synchronization signals through higher layers, receiving transmit power control commands from base stations, and determining transmit power for direct device-to-device communication, allowing efficient transmission of synchronization signals based on these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization signals are transmitted with high power to ensure reliable direct device-to-device communication, then communication reliability is improved, but power consumption increases and interference to other communications worsens
Solution Approach 1:
The patent implements dynamic transmit power control for synchronization signals by receiving TPC commands from the base station and adjusting the transmit power accordingly. The terminal determines the transmit power of the synchronization signal based on the TPC command received for the data channel, enabling adaptive power adjustment rather than fixed high-power transmission. This resolves the contradiction by making power consumption dynamic rather than statically high, maintaining reliability only when necessary.
2Reliability
If synchronization signals are transmitted with high power to ensure reliable direct device-to-device communication, then communication reliability is improved, but interference to other communications increases
Solution Approach 1:
The patent implements dynamic transmit power control for synchronization signals by receiving TPC commands from the base station and adjusting the transmit power accordingly. The terminal determines the transmit power of the synchronization signal based on the TPC command received for the data channel, enabling adaptive power adjustment rather than fixed high-power transmission. This resolves the contradiction by making power consumption dynamic rather than statically high, maintaining reliability only when necessary.
3Ease of operation
If transmit power for synchronization signal is determined independently without TPC commands, then transmission autonomy is improved, but power control precision and interference management worsen
Solution Approach 1:
The patent implements feedback-based power control where the terminal receives TPC (Transmit Power Control) commands from the base station for the data channel and uses these commands to determine the transmit power of the synchronization signal. This feedback mechanism allows the base station to precisely control the terminal's transmit power based on network conditions, interference levels, and resource availability, thereby improving power control precision while maintaining coordinated autonomy.
Data Source
AI summary
Disclosed in the present application is a method for transmitting a synchronization signal for a direct device-to-device communication by a user equipment in a wireless communication system. Specifically, the method comprises the steps of: setting a power parameter of a synchronization signal for the direct device-to-device communication through an upper layer; receiving, from a base station, a transmit power control (TPC) command for the direct device-to-device communication; determining a transmission power of the synchronization signal for the direct device-to-device communication on the basis of the power parameter and the TPC command; and transmitting the synchronization signal for the direct device-to-device communication according to the determined transmission power, wherein the TPC command is for a data channel of the direct device-to-device communication.