D2D Power Control Segmentation for Interference Management
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Solution Overview
Problem
Current D2D communication systems face challenges in efficiently transmitting and receiving signals and controlling transmission power, particularly in D2D communication scenarios where interference and resource reuse are prevalent, leading to suboptimal performance and potential interference with other devices or base stations.
Innovation Solution
A method and apparatus for controlling transmission power in D2D communication systems, where user equipment adjusts power based on power control commands from the base station, using distinct sets of power control values for D2D communication and communication with the base station, and feedback mechanisms for channel status information to optimize power settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of power control values is used for both D2D communication and communication with base station, then device complexity is reduced, but transmission performance deteriorates due to interference and resource reuse in D2D scenarios
Solution Approach 1:
The patent segments the power control values into two distinct sets: a first set for D2D communication scenarios and a second set for communication with the base station. This segmentation allows each set to be optimized for its specific scenario, resolving the contradiction between device complexity and transmission performance by providing scenario-specific optimization without requiring complete redesign of the power control mechanism.
Solution Approach 2:
The patent applies local quality by assigning different power control characteristics to different communication scenarios. The first power control set is specifically tailored for D2D communication with considerations for interference and resource reuse, while the second set is optimized for base station communication. This localized optimization improves transmission performance in each specific scenario without unnecessarily increasing overall device complexity.
2Reliability
If transmission power is increased to improve signal quality in D2D communication, then signal quality improves, but interference with other devices and base stations increases
Solution Approach 1:
The patent changes the power control parameters by providing two distinct sets of values with different characteristics. The first set for D2D communication is configured to achieve adequate signal quality while limiting excessive power increases that would cause interference. The second set for base station communication follows different power control rules. This parameter differentiation resolves the contradiction by allowing signal quality optimization without proportionally increasing interference.
Solution Approach 2:
The patent implements feedback mechanisms where user equipment reports channel status information to the base station, which then adjusts the appropriate power control set. This feedback loop allows the system to dynamically optimize signal quality while monitoring and controlling interference levels, resolving the contradiction between improving signal quality and reducing interference through adaptive control.
3Reliability
If distinct sets of power control values are used for different communication scenarios, then transmission performance improves, but device complexity and control signaling overhead increase
Solution Approach 1:
The patent introduces the base station as an intermediary that manages the selection and configuration of the two power control sets. Rather than requiring user equipment to independently manage complex power control decisions for different scenarios, the base station receives channel status feedback and determines which power control set to apply. This intermediary approach improves transmission performance through scenario-specific optimization while reducing device complexity by centralizing the decision-making logic.
Data Source
AI summary
Specifically, in one aspect of the present invention, a method and apparatus for controlling transmitting power by a terminal in a wireless communication system that supports device to device (D2D) communication include: receiving a power control command through a control channel from a base station; and adjusting transmitting power according to the power control command, wherein when the terminal performs D2D communication, the power control command indicates one of a first set of power control values having more states assigned to lower the transmitting power, and when the terminal performs communication with the base station, the power control command indicates one of a second set of power control values having more states assigned to raise the transmitting power.