Communication Device Beam Control via Channel Estimation
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Solution Overview
Problem
Current communication technologies face challenges in efficiently adjusting beam selection criteria between transmission and reception beams in 5G wireless communication systems, leading to increased signaling overhead and coarse beam direction granularity, especially when interference waves are present, and lack specified reference signals for reception beams.
Innovation Solution
A communication device that includes a reception unit, a transmission unit, and a control unit, which determines a weighting vector for reception and a precoding vector for transmission by performing channel estimation using a specific reference signal, allowing for optimal beam adjustment even when the reception beam is changed, thereby reducing interference and improving communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station determines PMI according to the changed reception beam by measuring the reference signal from the user apparatus, then the transmission beam direction can be optimized, but the signaling overhead between user apparatus and base station increases
Solution Approach 1:
The user apparatus autonomously determines its transmission beam by performing channel estimation using the reception beam of the base station, without requiring the base station to measure reference signals and feedback PMI. This self-service approach eliminates the need for PMI signaling while achieving optimal beam alignment through channel reciprocity
Solution Approach 2:
Instead of the base station determining the transmission beam direction based on uplink reference signals and feedback PMI to the user apparatus, the approach is inverted: the user apparatus determines its transmission beam by utilizing the downlink reception beam of the base station and performing channel estimation, leveraging channel reciprocity to achieve the same optimization without signaling overhead
2Reliability
If the base station directs the reception beam toward the direction so that the reception power of desired wave is increased, then the reception quality improves, but the transmission beam may not be optimally aligned with the changed reception beam
Solution Approach 1:
The base station transmits its reception beam information (weighting vector) as feedback to the user apparatus, enabling the user apparatus to determine its transmission beam accordingly. This feedback mechanism ensures that the transmission beam is optimally aligned with the changed reception beam, maintaining both reception quality and beam alignment accuracy
Solution Approach 2:
The reception beam information (weighting vector) acts as an intermediary that conveys the base station's beam direction preference to the user apparatus. This intermediary information enables the user apparatus to adjust its transmission beam to match the reception beam direction, ensuring optimal alignment without direct beam training between the two devices
3Reliability
If beam sweeping is performed to determine the transmission beam direction, then the reception quality becomes good, but the time required for beam determination increases
Solution Approach 1:
The base station performs preliminary action by determining its reception beam and obtaining the weighting vector in advance, before the user apparatus needs to determine its transmission beam. This preliminary determination of the reception beam provides the user apparatus with the necessary information to quickly determine its transmission beam without performing time-consuming beam sweeping
Solution Approach 2:
The user apparatus autonomously determines its transmission beam by performing channel estimation using the base station's reception beam information, without requiring the base station to perform beam sweeping or provide detailed beam direction instructions. This self-service approach reduces the time required for beam determination while maintaining optimal reception quality
Data Source
AI summary
Provided is a communication device. The communication device communicating with another communication device, includes: a reception unit configured to receive a signal transmitted from the another communication device; a transmission unit configured to transmit a signal to the another communication device; and a control unit configured to determine a weighting vector to be used in the reception unit and a precoding vector to be used in the transmission unit, in which, in a case where a specific reference signal indicating that the weighting vector used for receiving the signal in the another communication device has been changed is received by the reception unit, the control unit determines the precoding vector to be used for signal transmission by performing channel estimation by using the received specific reference signal, and in which the transmission unit transmits data precoded with the precoding vector determined by the control unit.