UE Scheduling via D2D Outage Margin for Interference Control
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Solution Overview
Problem
In communication systems using GSM, CDMA, UMTS, and LTE technologies, D2D communication is interfered by cellular uplink sessions, leading to reduced D2D and cellular throughput due to interference from cellular user equipment (UE) to D2D receivers.
Innovation Solution
A method and apparatus for scheduling UE in a communication system that determines a target transmission power for UE based on the outage margin of D2D communication to mitigate interference, thereby improving D2D and cellular throughput by adjusting the transmission power of UEs to minimize interference during uplink sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If same frequency band is shared by cellular UE and D2D devices, then spectrum utilization is improved, but interference from cellular uplink to D2D communication increases
Solution Approach 1:
The patent dynamically adjusts the transmission power parameter of cellular UEs based on D2D communication conditions. By changing the power level parameter, the system maintains spectrum sharing while controlling interference, allowing the same frequency band to be used by both cellular and D2D devices without severe degradation of D2D quality.
Solution Approach 2:
The system implements a feedback mechanism where the base station monitors D2D communication quality and adjusts cellular UE transmission powers accordingly. This closed-loop control ensures that when D2D devices are active, cellular UEs receive power adjustment instructions that prevent excessive interference, thereby maintaining both spectrum utilization and D2D communication quality.
2Productivity
If cellular UE transmission power is increased, then cellular throughput is improved, but interference to D2D receiver increases
Solution Approach 1:
The base station dynamically adjusts the transmission power parameter of cellular UEs based on real-time D2D communication conditions. When D2D devices are actively communicating, the system reduces cellular UE power to acceptable levels; when D2D activity is low, cellular power can be increased to maximize throughput, thus dynamically balancing both objectives.
Solution Approach 2:
The patent implements dynamic power control where cellular UE transmission powers are not fixed but continuously adjusted based on D2D communication status. This dynamic approach allows the system to adapt to changing conditions, maximizing cellular throughput when possible while preventing harmful interference when D2D devices are active.
3Reliability
If D2D communication quality is prioritized, then interference to D2D receiver is reduced, but cellular throughput may be limited
Solution Approach 1:
The system uses feedback from D2D communication quality measurements to adjust cellular UE powers. The base station receives quality indicators from D2D receivers and translates them into power adjustment instructions for cellular UEs, creating a balanced operation where both D2D quality and cellular throughput are optimized based on real-time conditions.
Solution Approach 2:
The patent applies partial power reduction to cellular UEs only when and where necessary for D2D protection, rather than uniformly limiting all cellular transmissions. This selective approach ensures that cellular throughput is not unnecessarily restricted while still providing adequate protection to D2D communications in affected areas.
Data Source
AI summary
Embodiments of the disclosure provide methods and apparatuses for scheduling a UE in a communication system comprising D2D communication and cellular communication. The cellular communication is performed between a base station (BS) and at least one UE, and the D2D communication is performed between a D2D transmitter and a D2D receiver. According to the method of the present invention, an outage margin of the D2D communication is obtained, wherein the outage margin indicates the margin that the communication from the D2D transmitter to the D2D receiver is in outage; and a target transmission power of the at least one UE is determined based on the outage margin to perform cellular scheduling.