Beam Reference Signaling for D-MIMO Timing Synchronization
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing timing differences between different access points (APs) in Distributed massive Multiple Input Multiple Output (D-MIMO) systems, particularly in B6G and mmWave/THz bands, leading to interference and reduced joint transmission performance.
Innovation Solution
A method and device for transmitting and receiving beam reference signals that include synchronization symbols and channel state information reference signals (CSI-RS) with adjusted cyclic prefixes, allowing for timing difference measurements and synchronization across multiple bands, enabling improved synchronization and data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple APs transmit downlink signals simultaneously in D-MIMO system, then joint transmission performance is improved, but timing differences cause interference and reduce performance
Solution Approach 1:
The patent applies preliminary action by performing timing difference measurements using synchronization symbols and CSI-RS resources before actual data transmission. The UE measures timing differences between multiple APs in advance, reports these measurements to the network, and allows the network to adjust transmission timing beforehand, preventing interference during joint transmission.
Solution Approach 2:
The patent implements feedback by having the UE measure timing differences between APs and report these measurements back to the network. This feedback loop enables the network to understand the timing relationships between APs and adjust their transmission timing accordingly, resolving the interference issue while maintaining joint transmission performance.
2Measurement precision
If synchronization symbols and CSI-RS are transmitted in multiple bands, then timing difference measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing synchronization symbols and CSI-RS resources that serve multiple functions across different frequency bands. These reference signals are configured to enable both synchronization and timing difference measurement simultaneously in B6G and mmWave/THz bands, reducing the need for separate measurement mechanisms and thereby managing device complexity.
Data Source
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AI summary
According to various embodiments of the present disclosure, there is provided a method performed by a user equipment (UE) in a wireless communication system. The method may comprise receiving, from a first device, downlink control information (DCI) in a first band, receiving, from the first device, a first signal including a first synchronization symbol and first channel state information reference signal (CSI-RS) symbols in a second band, receiving, from second devices, second signals including second CSI-RS symbols in the second band, performing a measurement on the first signal and the second signals based on the first CSI-RS symbols and the second CSI-RS symbols, transmitting, to the first device, a result of performing the measurement in the first band, and receiving data from at least one of the first device or the second devices in the second band.