Uplink Parameter Selection via PDCCH Resource Mapping
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Solution Overview
Problem
Current LTE systems face challenges in achieving optimal performance for decoupled uplink and downlink transmissions, especially in heterogeneous networks with non-ideal backhaul, leading to inefficiencies and interference issues due to coupled power control designs.
Innovation Solution
A method for selecting uplink transmission parameters based on mappings between physical downlink control channel resources and multiple sets of uplink transmission parameters, allowing for independent configuration of power control settings and resource allocation, even in scenarios with slow backhaul, enabling efficient decoupling of UL/DL transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coupled power control design is used in LTE systems, then network simplicity is maintained, but performance in decoupled UL/DL transmissions deteriorates
Solution Approach 1:
The invention segments the power control design into separate uplink and downlink components. Instead of using a coupled power control mechanism that treats UL and DL as a single integrated system, the patent implements independent power control for uplink transmissions and downlink transmissions. This segmentation allows each direction to be optimized independently, resolving the contradiction by maintaining network simplicity through modular design while improving performance in decoupled UL/DL scenarios.
Solution Approach 2:
The invention introduces dynamic adaptation of power control parameters based on the coupling state between UL and DL. The system can dynamically switch between coupled and decoupled power control modes, and adjust power control parameters according to real-time channel conditions and backhaul status. This dynamic approach enables the system to maintain simplicity when coupled operation is beneficial while achieving optimal performance when decoupling is required.
2Productivity
If decoupled UL/DL transmissions are implemented, then spectral efficiency is improved, but interference issues worsen due to coupled power control design
Solution Approach 1:
The invention applies local quality by implementing location-specific power control parameters for different transmission points and reception points. In decoupled UL/DL scenarios, the system can assign different power control settings to different TPs and RPs based on their specific interference environments. This allows the system to maximize spectral efficiency through decoupling while locally optimizing power levels to minimize interference generation and reception.
3Reliability
If independent configuration of power control settings is enabled, then UL/DL decoupling performance is improved, but device complexity increases
Solution Approach 1:
The invention implements a universal power control configuration framework that can handle both coupled and decoupled UL/DL scenarios through a single integrated mechanism. The system uses a unified configuration structure with configurable parameters that automatically adapt to different operational modes. This multi-functionality approach enables independent power control configuration for UL and DL while maintaining a standardized interface and configuration management system, thereby improving decoupling performance without proportionally increasing device complexity.
Data Source
AI summary
The present invention relates to a method for selecting a set of uplink transmission parameters. The method is performed in a wireless device of a radio communications system. The method comprises obtaining information mapping resources of a physical downlink control channel region to at least two sets of uplink transmission parameters. The method also comprises receiving a downlink control message on a resource of the physical downlink control channel region, and selecting a set among the at least two sets of uplink transmission parameters. The selection of set is based on the resource of the physical downlink control channel region on which the downlink control message is received, and on the obtained information mapping resources of the physical downlink control channel region to the at least two sets of uplink transmission parameters.