Duplicated Downlink Control Information for URLLC Reliability
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Solution Overview
Problem
In wireless communication technology, particularly for URLLC, existing retransmission processes like ARQ/HARQ may not ensure high reliability for data transmission under time constraints, and are not available for control information transmission, leading to potential delays and errors.
Innovation Solution
A network node and user equipment adapted for carrier aggregation, transmitting duplicated downlink control information on multiple carriers to enhance reliability, using processing and radio circuitry to configure and evaluate control information, ensuring reliable scheduling and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission processes (ARQ/HARQ) are used for data transmission, then transmission reliability is improved, but transmission delay increases and the process cannot be applied to control information transmission
Solution Approach 1:
The patent applies preliminary action by transmitting duplicated downlink control information on multiple carriers before the actual data transmission is needed. This ensures that control information is received reliably without waiting for retransmission processes, thereby reducing transmission delay while maintaining high reliability for URLLC applications
2Reliability
If duplicated downlink control information is transmitted on multiple carriers, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the control information transmission across multiple independent carriers. Each carrier transmits a copy of the DCI independently, allowing the system to achieve diversity gain without requiring complex cross-carrier coordination mechanisms, thus managing device complexity while improving reliability
3Reliability
If carrier aggregation is used for control information transmission, then frequency diversity gain is achieved, but processing complexity increases
Solution Approach 1:
The patent applies copying by creating duplicate copies of the downlink control information and transmitting them on different carriers. The user equipment simply needs to decode the DCI from any one of the carriers, avoiding complex processing while achieving frequency diversity gain through the redundant copies
Data Source
AI summary
There is disclosed a network node for a Radio Access Network, the network node being adapted for communication utilizing a carrier aggregation comprising at least a first carrier and a second carrier. The network node is adapted for transmitting first downlink control information on the first carrier of the carrier aggregation, and second downlink control information on the second carrier of the carrier aggregation, wherein the first downlink control information and the second downlink control information pertain to transmission on the same uplink carrier.