Multi-Link ACK Feedback with Phase-Shift Link Failure Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing acknowledgment reporting for multi-link transmissions, particularly in scenarios involving multiple radio links, which can lead to increased uplink interference and reduced robustness in feedback procedures.
Innovation Solution
The proposed solution involves transmitting acknowledgment feedback for combined signals with a phase shift that indicates the success or failure of individual radio links, allowing for implicit indication of which links failed, thereby enhancing the robustness of the feedback process and reducing uplink interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate acknowledgment feedback is transmitted for each radio link, then individual link reliability is improved, but uplink interference increases and feedback robustness decreases
Solution Approach 1:
The patent combines multiple separate acknowledgment feedback signals into a single combined feedback signal that is transmitted on one radio link. This merging approach reduces the total number of feedback transmissions, thereby decreasing uplink interference while still conveying information about the status of multiple radio links through the combined signal structure.
Solution Approach 2:
The combined acknowledgment feedback signal serves multiple functions simultaneously: it indicates the reception status of multiple radio links, identifies which specific links failed, and enables the receiving device to determine appropriate retransmission strategies. This multi-functionality is achieved within a single feedback transmission, improving efficiency without increasing interference.
2Loss of information
If multiple separate feedback signals are transmitted, then feedback completeness is improved, but uplink resources are consumed more efficiently
Solution Approach 1:
Multiple feedback indications are merged into a single combined feedback signal that conveys complete information about all radio links. This includes both the overall reception status and identification of specific failed links, ensuring no information is lost while transmitting in a single resource allocation.
Solution Approach 2:
The patent encodes multiple feedback dimensions within a single signal transmission by using phase shifts and signal combinations. Instead of transmitting separate feedback signals for each link, the system multiplexes feedback information across different dimensional parameters of a single signal, reducing uplink resource consumption while maintaining completeness.
3Measurement precision
If phase shift is applied to combined feedback signal, then link failure indication precision is improved, but signal processing complexity increases
Solution Approach 1:
The patent uses phase shift as a parameter modulation technique to encode feedback information. By varying the phase of the combined feedback signal based on which radio links failed, the system achieves precise link failure indication. This parameter-based encoding is more efficient than using multiple separate signals, as it achieves the same precision with simpler processing requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit acknowledgment feedback for a combined signal derived from individual downlink signals received on respective radio links, where the acknowledgment feedback is transmitted with a phase shift applied to the transmission. In some cases, the phase shift may indicate which individual downlink signals were unsuccessfully received and decoded on the respective radio links. For example, the acknowledgment feedback message may include acknowledgment feedback for a final decoding of the combined signal on whether the combined signal is successfully received and decoded and side negative acknowledgment information indicating which individual radio links were unsuccessfully received and decoded via the phase shift. The UE may transmit the acknowledgment feedback on a strongest radio link, a subset of the radio links, or on all of the radio links.