UE Channel Offset Measurement in Distributed Antenna Systems
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Solution Overview
Problem
In distributed antenna wireless communication systems, particularly in 5G/NR networks, there is a challenge in accurately measuring and reporting channel parameters such as channel offsets for target entities, which affects the performance and efficiency of beamforming and resource allocation.
Innovation Solution
The proposed solution involves a user equipment (UE) that measures channel offsets using measurement reference signals (RSs) like channel state information (CSI)-RSs, synchronization signal blocks (SSBs), or both. The UE then reports these measurements in a CSI report, allowing the base station to adjust its configuration and improve channel alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed antenna systems are used to support massive connections and beamforming, then network capacity and coverage are improved, but channel parameter measurement accuracy deteriorates due to channel offsets between distributed entities
Solution Approach 1:
The patent introduces measurement reference signals (RS) as an intermediary mechanism to enable accurate channel parameter measurement. These reference signals are transmitted through the distributed antenna system and serve as a common reference for all distributed entities, allowing the UE to measure and report channel offsets accurately despite the distributed nature of the system.
Solution Approach 2:
The patent implements dynamic parameter adjustment by having the UE measure channel offsets and report them to the base station, which then adjusts transmission parameters (such as phase and amplitude) based on the reported measurements. This closed-loop parameter adjustment compensates for channel variations in distributed antenna systems.
2Measurement precision
If channel offset measurement and reporting is implemented in distributed antenna systems, then beamforming accuracy is improved, but device complexity and measurement overhead increase
Solution Approach 1:
The patent performs channel offset measurement in advance using dedicated measurement reference signals before actual data transmission. The UE measures the channel offsets and reports them to the base station, which then uses these pre-measured parameters for beamforming and resource allocation, simplifying the real-time transmission process.
Solution Approach 2:
The patent implements a feedback mechanism where the UE measures channel parameters and reports them back to the base station. The base station uses this feedback information to adjust its transmission parameters, creating a closed-loop system that continuously optimizes beamforming accuracy while managing measurement overhead through efficient feedback scheduling.
Data Source
AI summary
Methods and apparatuses for measuring and reporting channel parameters in a distributed antenna wireless communication system. A method for operating a user equipment (UE) includes receiving a configuration for reporting in a channel state information (CSI) report a channel offset for a target entity; measuring one or more measurement reference signals (RSs) for determining the channel offset; determining, based on the measured one or more measurement RSs, the channel offset for the target entity; and transmitting, at least based on the configuration, the CSI report including a channel offset report associated with the determined channel offset. The measurement RSs comprise channel state information reference signals (CSI-RSs), synchronization signal blocks (SSBs), or both CSI-RSs and SSBs.