D2D Communication Power Allocation Using Dirty Paper Coding
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Solution Overview
Problem
Inband underlay D2D communication in cellular networks faces challenges with interference management and computational complexity, leading to inefficiencies in spectral utilization and increased system overhead, while inband overlay D2D results in lower spectral efficiency due to separate resource block allocation.
Innovation Solution
A method and apparatus for device-to-device (D2D) communication that allows simultaneous cellular UL and D2D transmissions in the same resource block, using dirty paper coding (DPC) for interference management and power allocation to maximize overall transmission rates, enabling efficient resource sharing and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If underlay D2D communication is used to improve spectral efficiency, then spectrum utilization is improved, but interference to cellular network increases
Solution Approach 1:
The patent applies dirty paper coding (DPC) to convert the harmful interference between D2D and cellular users into a manageable condition. By using channel state information to pre-subtract interference, the system achieves underlay D2D communication with controlled interference levels, transforming the harmful effect into a solvable problem that maintains both spectral efficiency and cellular network performance
Solution Approach 2:
The patent dynamically adjusts transmission power parameters for D2D and cellular users based on channel conditions and interference levels. By changing power allocation parameters adaptively, the system optimizes spectral efficiency while keeping interference to cellular network within acceptable thresholds
2Object-affected harmful factors
If centralized resource allocation is used for overlay D2D to manage interference, then interference control is improved, but system overhead increases
Solution Approach 1:
The patent enables D2D users to autonomously determine their transmission parameters using locally available channel state information and simple interference checks. This self-service approach eliminates the need for complex centralized resource allocation, reducing system overhead while maintaining interference control through distributed decision-making
3Object-affected harmful factors
If centralized resource allocation is used for underlay D2D to manage interference, then interference management is improved, but computational complexity increases
Solution Approach 1:
The patent shifts interference management from centralized to distributed operation, where each D2D user independently manages its own interference using local channel state information. This eliminates the need for computationally intensive centralized optimization while maintaining effective interference management through simple local decisions
Solution Approach 2:
The patent extracts the essential function of interference management from the centralized controller and implements it locally at each D2D user. By taking out the complex centralized optimization and replacing it with simple local interference checks and power adjustments, the system maintains interference management effectiveness while dramatically reducing computational complexity
Data Source
AI summary
The disclosure is directed to a method and apparatus for D2D communication in a wireless communication system and related apparatuses using the same. In one of the exemplary embodiments, a proposed method may include determining whether to performing a D2D transmission and a cellular transmission simultaneously in a resource block allocated in a cellular uplink time slot; if a cellular uplink transmission rate in addition to a D2D transmission rate is greater than or equal to a maximum cellular UL transmission rate: performing the D2D transmission and the cellular transmission simultaneously; and adjusting a power of the D2D transmission and a power of the cellular transmission to maximize an overall transmission rate which is the cellular UL transmission rate in addition to the D2D transmission rate.