NACK-Guided Beam Switching After Failed Downlink Reception
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in beam management due to misinterpretation of negative acknowledgement (NACK) transmissions, leading to resource wastage and communication failures when beam switching is not accurately performed.
Innovation Solution
Implementing a method where user equipment (UE) and base stations utilize negative acknowledgement (NACK) transmissions to determine failed downlink receptions and switch to new beams based on channel quality indicators (CQIs) for improved communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam switching is not accurately performed, then communication reliability deteriorates, but resource consumption increases due to retransmissions and failed transmissions
Solution Approach 1:
The patent implements feedback mechanisms where UEs report beam failure and NACK transmissions provide information about reception failures. The base station uses this feedback to identify failed beams and switch to alternative beams, resolving the contradiction by enabling reliable communication through informed beam switching while avoiding wasteful retransmissions on failed beams.
Solution Approach 2:
The patent performs preliminary beam failure detection and reporting before attempting transmissions on failed beams. By proactively identifying and reporting beam failures through NACK transmissions and beam failure indication resources, the system prevents resource wastage on doomed transmissions, thus improving reliability without increasing resource consumption.
2Reliability
If beam switching accuracy is improved through NACK-based detection, then communication reliability enhances, but system complexity increases due to additional signaling and processing
Solution Approach 1:
The patent makes NACK transmissions serve dual purposes: traditional HARQ feedback and beam failure indication. By enabling NACKs to function as beam failure indicators when sent on specific resources or under certain conditions, the system improves beam switching accuracy without adding entirely new signaling mechanisms, thus limiting the increase in system complexity.
Solution Approach 2:
The patent combines beam failure indication functionality with existing NACK transmission mechanisms. Instead of creating separate dedicated beam failure reporting channels, the system merges beam failure indication into the existing HARQ feedback framework, allowing reliable beam switching while avoiding the complexity overhead of completely separate signaling systems.
3Loss of energy
If traditional HARQ feedback is used without beam failure indication, then system complexity remains low, but resource wastage occurs due to continued transmissions on failed beams
Solution Approach 1:
The patent enhances traditional HARQ feedback by enabling NACK transmissions to indicate beam failure conditions. When a UE sends a NACK on a specific uplink resource or with specific timing, it simultaneously signals both reception failure and beam failure, allowing the base station to stop wasting resources on failed beams while using the existing feedback infrastructure.
Solution Approach 2:
The patent uses NACK transmissions as an intermediary mechanism that bridges traditional HARQ feedback and new beam failure indication requirements. The NACK serves as a mediator that carries dual information (reception status and beam health), reducing resource wastage without requiring completely new complex signaling protocols.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a measurement report indicating a set of channel quality indicators for a set of candidate beams; determine that a downlink transmission from a base station is not received via one or more beams of the set of candidate beams; and transmit a negative acknowledgement for the downlink transmission via one or more new beams of the set of candidate beams. Numerous other aspects are provided.