Uplink Control Information Transmission for Beam Mismatch Resolution
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Solution Overview
Problem
In mmWave wireless communication systems, beam mismatch between user equipment and base stations leads to communication inefficiencies and unstable connections due to pathloss and Doppler effects, necessitating effective methods for transmitting beam-related control information to resolve these issues.
Innovation Solution
A method involving user equipment (UE) determining beam mismatch, transmitting a RACH preamble to request uplink resources, receiving UL assignment information, and transmitting beam-related control information, including BSI, via specifically allocated resources, using RACH preambles defined by root values, cyclic shifts, sub-bands, and OCCs, to stabilize beamforming and improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is elaborately designed to prevent beam mismatch in mmWave communication, then connection stability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements a feedback mechanism where the UE detects beam mismatch conditions and sends uplink control information (UCI) containing beam state information to the base station. The base station uses this feedback to adjust beamforming parameters and resolve the mismatch, thereby maintaining connection stability without requiring overly complex predetermined beamforming designs.
Solution Approach 2:
The UE autonomously detects beam mismatch conditions by monitoring downlink reference signals and determines when to trigger beam mismatch resolution procedures. This self-service approach allows the system to maintain reliability without requiring constant base station control, reducing overall system complexity.
2Productivity
If traditional uplink control information transmission methods are used for beam mismatch resolution, then implementation is simple, but communication efficiency deteriorates due to increased signaling overhead
Solution Approach 1:
The patent merges beam state information with other uplink control information (such as HARQ-ACK and CSI) and transmits them together in a single UCI message using the same uplink resources. This combining approach resolves beam mismatch efficiently while minimizing signaling overhead, as the beam information is carried along with necessary control signals rather than requiring separate dedicated resources.
3Reliability
If beam mismatch resolution procedures are frequently triggered, then connection stability is improved, but loss of time increases due to repeated feedback exchanges
Solution Approach 1:
The UE continuously monitors downlink reference signals and pre-identifies beam mismatch conditions before they severely impact communication. By detecting mismatches early and triggering resolution procedures proactively, the system maintains stable connections while minimizing the time lost to feedback exchanges, as issues are addressed before they require multiple correction iterations.
Data Source
AI summary
Disclosed are an information transmission method and terminal for: determining from a base station that a beam mismatch has occurred; transmitting a terminal-specifically allocated RACH preamble to the base station in order to transmit beam-related information indicating that the beam mismatch to the base station; receiving, from the base station, a message (for example, RACH response) for requesting transmission of the beam-related information; and transmitting uplink control information including the beam-related information to the base station.