Dynamic Antenna Port Selection for Downlink Control Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently determining the reference signal antenna port for downlink control channels, particularly in multi-antenna environments where existing methods are insufficient for managing increased complexity and interference.
Innovation Solution
The method involves dynamically selecting and configuring antenna ports for demodulation reference signals (DM-RS) based on the number of E-CCEs generated in a PRB pair, using functions to map available antenna ports for efficient resource element utilization and minimizing overhead, allowing for flexible allocation and interference avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antenna ports are used for downlink control channel transmission, then data capacity and user density support are improved, but interference management and system complexity increase
Solution Approach 1:
The patent implements dynamic antenna port selection where the UE determines the antenna port index based on the number of E-CCEs generated in a PRB pair. This dynamic adaptation allows the system to optimize between using more antenna ports (for higher capacity) or fewer ports (for lower complexity) depending on current resource conditions, thereby resolving the contradiction between productivity and device complexity
Solution Approach 2:
The invention changes the parameter of antenna port index selection based on the number of E-CCEs. By making the antenna port configuration dependent on a variable parameter (number of E-CCEs), the system can adaptively adjust the complexity and capacity trade-off, allowing multiple antenna ports to be used when needed for high data capacity while reducing to fewer ports when simplicity is required
2Productivity
If antenna ports are dynamically selected based on E-CCE count, then resource element utilization is improved, but determination complexity increases
Solution Approach 1:
The UE autonomously determines the antenna port index by itself based on the number of E-CCEs generated in the PRB pair, without requiring additional signaling from the eNB. This self-service mechanism improves resource element utilization through adaptive selection while avoiding the complexity of centralized control and additional control messages
3Reliability
If more antenna ports are configured, then interference avoidance is improved, but overhead increases
Solution Approach 1:
The patent changes the antenna port configuration parameter dynamically based on the number of E-CCEs. When more E-CCEs are available, more antenna ports can be used for better interference avoidance. When E-CCEs are limited, fewer antenna ports are used to reduce overhead. This parameter adaptation resolves the contradiction between reliability and quantity of substance
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Abstract: The present invention relates to a method of transmitting a downlink control channel including one or more control channel elements to a terminal by a base station in a wireless communication system. In particular, the method includes: allocating an antenna port of a demodulation-reference signal (DM-RS) to the one or more control channel elements that configure the downlink control channel; and transmitting the downlink control channel to the terminal by using the DM-RS of the allocated antenna port, wherein the antenna port of the DM-RS is determined on the basis of the number of control channel elements per resource block.