Beam Adjustment Request via RACH for Millimeter Wave Reliability
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Solution Overview
Problem
Millimeter wave (mmW) systems experience high path loss, requiring directional transmission and beam adjustment to maintain effective communication, with existing methods lacking efficient mechanisms for UE to inform the base station of beam changes and adapt accordingly.
Innovation Solution
The UE sends a beam index and corresponding beam refinement reference signal session request to the base station in a subframe reserved for the random access channel (RACH), allowing the base station to transmit parameters for beam failure recovery and handover, enabling the UE to adjust beams and maintain communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If directional beam transmission is used to mitigate path loss in mmW systems, then communication reliability is improved, but the system complexity increases due to the need for beam adjustment mechanisms
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends beam adjustment requests to the base station when beam changes are needed. The base station receives these requests and adjusts its beam accordingly, creating a closed-loop system that maintains reliable communication without requiring complex autonomous beam management at the UE side
Solution Approach 2:
The patent introduces a simplified intermediary signaling mechanism where the UE indicates beam change needs through predefined uplink resources rather than directly controlling base station beams. This intermediary approach reduces the complexity burden on the UE while maintaining communication reliability through coordinated beam adjustment
2Reliability
If the UE continuously monitors and reports beam changes to the base station, then communication reliability is improved, but the signaling overhead and loss of time increase
Solution Approach 1:
The patent employs periodic beam adjustment requests where the UE monitors beam quality and sends adjustment requests only when predefined conditions are met, rather than continuously reporting. This periodic approach maintains reliability by detecting beam failures promptly while reducing unnecessary signaling overhead and time loss
Solution Approach 2:
The patent implements partial monitoring where the UE focuses on detecting beam failure conditions rather than continuously reporting all beam quality metrics. This selective approach uses predefined uplink resources for beam adjustment requests, maintaining sufficient reliability for beam failure recovery while minimizing signaling overhead and time consumption
3Measurement precision
If beam refinement reference signal sessions are initiated for every beam adjustment request, then measurement precision is improved, but the use of energy and loss of time increase
Solution Approach 1:
The patent configures beam refinement reference signals in advance through RRC signaling, so that when beam adjustment is needed, the UE can immediately use pre-configured resources for measurement without initiating new signal sessions. This preliminary configuration reduces energy consumption and time delay while maintaining measurement precision through properly configured reference signals
Solution Approach 2:
The patent implements dynamic beam adjustment where beam refinement reference signal sessions are initiated only when actually needed based on beam failure detection, rather than continuously. This dynamic approach adjusts the measurement activity level according to channel conditions, maintaining measurement precision when necessary while reducing energy consumption during stable conditions
Data Source
AI summary
One apparatus may determine a first set of parameters associated with a first RACH procedure, the first set of parameters being associated with beam failure recovery for a first UE in a cell. The apparatus may send the first set of parameters to the first UE. Another apparatus may receive the first set of parameters associated with a first RACH procedure. The other apparatus may receive, from the first apparatus, a second set of parameters associated with a second RACH procedure. The other apparatus may generate a RACH preamble based on the first set of parameters or based on the second set of parameters. The other apparatus may send, to the first apparatus, the generated RACH preamble.