PDCCH Command Feedback for Secondary Cell Activation
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Solution Overview
Problem
In the New Radio (NR) system, there is a lack of feedback mechanism for the Physical Downlink Control Channel (PDCCH), which results in low reliability when the network side issues activation-deactivation or dormancy-non-dormancy switching commands to terminal devices without knowing if these commands are received.
Innovation Solution
A feedback method is introduced where terminal devices receive Downlink Control Information (DCI) carrying first indication information about the state of Secondary Cells (Scells) or Scell groups, and then transmit second indication information to the network device acknowledging receipt of the first indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback mechanism is introduced for PDCCH to confirm command reception, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device sends acknowledgment information back to the network device after receiving DCI commands. This feedback loop allows the network device to confirm whether the terminal has successfully received activation-deactivation or dormancy-non-dormancy switching commands, thereby resolving the reliability issue of PDCCH command transmission without requiring complex protocol changes.
2Productivity
If activation-deactivation commands are transmitted via DCI for rapid Scell recovery, then productivity is improved, but reliability deteriorates due to lack of feedback
Solution Approach 1:
The patent introduces an acknowledgment feedback mechanism where terminal devices transmit confirmation information back to the network device after receiving DCI commands. This enables the network device to verify successful reception of activation-deactivation or dormancy-non-dormancy switching commands, ensuring reliable execution while maintaining the rapid response capability of DCI-based command transmission.
Data Source
AI summary
The embodiments of the present disclosure provide a feedback method and apparatus, a terminal device, and a network device. The method includes: receiving, by a terminal device, Downlink Control Information (DCI) transmitted by a network device, the DCI carrying first indication information indicating a state of at least one group of secondary cells (Scells) or at least one Scell; and transmitting, by the terminal device, second indication information to the network device, the second indication information indicating that the terminal device acknowledges receipt of the first indication information.