Beam Change Acknowledgment Reliability in Wireless Systems
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Solution Overview
Problem
Wireless communication systems face reliability issues in acknowledging beam changes due to the random nature of wireless channels, leading to potential radio link failures and loss of timing synchronization when UE fails to receive beam configuration signals.
Innovation Solution
The solution involves transmitting beam change indications on both the downlink control channel and data channel, with the UE providing separate acknowledgement feedback, ensuring at least two opportunities for reliable acknowledgment, thereby improving the reliability of beam change acknowledgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam change indication is transmitted on a single downlink channel, then transmission complexity is reduced, but reliability of beam change acknowledgment deteriorates due to potential signal failure on that single channel
Solution Approach 1:
The patent segments the beam change indication transmission across two separate downlink channels: a downlink control channel (e.g., PDCCH) and a downlink data channel (e.g., PDSCH). This segmentation ensures that if one channel fails to deliver the indication, the other may succeed, thereby improving reliability without requiring a completely redundant transmission system
Solution Approach 2:
The patent implements a feedback mechanism where the UE sends separate acknowledgment feedback to confirm receipt of the beam change indication. This feedback loop allows the base station to verify successful delivery and retransmit if necessary, significantly enhancing the reliability of beam change acknowledgment while maintaining manageable system complexity through standardized protocol interactions
2Reliability
If separate ACK feedback is transmitted for beam change indication, then acknowledgment reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the acknowledgment of beam change indication with existing uplink resources and procedures. The separate ACK feedback is integrated into the uplink control information (UCI) framework and can be transmitted using allocated uplink control channel resources, thereby improving acknowledgment reliability while minimizing additional signaling overhead through resource consolidation
Data Source
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Figure 2A~2D
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AI summary
A UE may be configured to receive, from a base station, a downlink transmission on a downlink data channel including data and an indication of a beam switch; transmit first ACK feedback to the base station in response to receiving the data; and transmit second ACK feedback to the base station in response to receiving the indication of the beam switch, the second ACK feedback being separate from the first ACK feedback. A base station may be configured to transmit, to a UE, a downlink transmission on a downlink data channel including data and an indication of a beam switch; receive first ACK feedback from the UE in response to transmitting the data; and receive second ACK feedback from the UE in response to transmitting the indication of the beam switch, the second ACK feedback being separate from the first ACK feedback.