CSI-RS L1 Measurement Adaptation for SBFD Overlap
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining reliable channel state information (CSI) reference signal (CSI-RS) based measurements, particularly in subband full-duplex (SBFD) operations, due to overlapping and non-overlapping CSI-RS resources with SBFD symbols, which can degrade measurement performance and hinder radio link monitoring (RLM) and beam failure detection (BFD).
Innovation Solution
The proposed solution involves configuring CSI-RS resources to overlap with downlink usable physical resource blocks (PRBs) of SBFD symbols and enabling UE to transmit CSI-RS measurement reports based on Layer 1 (L1) measurements, with measurement periods and thresholds adjusted accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSI-RS resources are configured to overlap with SBFD symbols, then resource utilization is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies local quality by configuring different measurement parameters (measurement period and threshold) for CSI-RS resources depending on their specific overlap situation with SBFD symbols. When CSI-RS resources overlap with SBFD symbols, adjusted measurement parameters are used to account for the degraded measurement conditions in that specific local context, while non-overlapping resources use standard parameters.
Solution Approach 2:
The patent changes measurement parameters (measurement period and threshold) based on the overlap condition between CSI-RS resources and SBFD symbols. This parameter adaptation allows the system to maintain reliable measurements even when resources overlap, by adjusting the measurement criteria to account for the interference environment.
2Reliability
If measurement parameters are adjusted for overlapping CSI-RS resources, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic measurement parameters that are selected based on the overlap condition between CSI-RS resources and SBFD symbols. The network entity configures multiple sets of measurement parameters and the UE dynamically selects the appropriate set based on the resource overlap situation, allowing adaptation to changing conditions without permanent complexity.
Solution Approach 2:
The patent uses an intermediary mechanism where the network entity provides configuration information indicating which CSI-RS resources overlap with SBFD symbols. This intermediary configuration layer simplifies the UE's task by providing clear guidance on which measurement parameters to use, rather than requiring the UE to independently determine overlap conditions and select parameters.
Data Source
AI summary
Apparatus, methods, and computer program products for wireless communication are provided. An example method may include receiving, from a network entity, a configuration of at least one channel state information (CSI) reference signal (CSI-RS) resource, where the at least one CSI-RS resource overlaps with at least one downlink (DL) usable physical resource block (PRB) of a sub-band full-duplex (SBFD) symbol. The example method may further include transmitting, to the network entity, a CSI-RS measurement report based on a layer 1 (L1) measurement of the at least one CSI-RS resource, where a measurement period or a measurement threshold associated with the L1 measurement is based on the at least one CSI-RS resource being overlapping with the at least one DL usable PRB of the SBFD symbol.