Aggregated Downlink Control Channel for Dynamic TDD Interference
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Solution Overview
Problem
In the NR system, downlink control information (DCI) transmission is hindered by interference from uplink communication in neighboring cells, leading to poor reception and degraded performance in dynamic TDD scenarios, where each cell dynamically adjusts its communication resources.
Innovation Solution
A base station configures and transmits downlink control information using an aggregated downlink control channel, which aggregates multiple downlink control channels across slots to reduce interference and ensure reliable reception, employing techniques like repeated transmission and frequency hopping to enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is used to flexibly control downlink and uplink resources in each cell, then resource utilization efficiency is improved, but downlink control information reception reliability deteriorates due to interference from uplink communication in neighboring cells
Solution Approach 1:
The downlink control channel is segmented into multiple candidate channels across different time-frequency resources. The user apparatus is configured to monitor multiple PDCCH candidates in different slots, allowing the system to divide the control information transmission across multiple opportunities rather than relying on a single channel, thereby improving reliability under dynamic TDD conditions
Solution Approach 2:
The base station performs preliminary configuration of downlink control channel monitoring opportunities before actual data transmission. The user apparatus is pre-configured with multiple PDCCH monitoring occasions and candidate positions, enabling it to proactively search for and receive control information at predetermined locations, thus ensuring reliable reception even when interference patterns vary dynamically
Data Source
AI summary
A base station configured to perform communication with a user apparatus in a radio communication system, including: a storage unit configured to store configuration information on an aggregated downlink control channel in which a plurality of downlink control channels in a plurality of slots are aggregated; and a transmission unit configured to transmit downlink control information, to the user apparatus, using the aggregated downlink control channel based on the configuration information.