Adaptive CSI-RS Frequency Density for Beam Failure Detection
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Solution Overview
Problem
Wireless networks face challenges in efficiently managing resources to provide bandwidth and response times due to multiple devices sharing resources, with limitations from communication protocols and hardware bandwidth, especially when operating with both new and legacy protocols.
Innovation Solution
The implementation of adaptive channel state information reference signal (CSI-RS) frequency densities, which allows user equipment (UE) to determine the subcarrier spacing of a bandwidth part (BWP) and adjust the frequency density of CSI-RS resources based on the frequency band, enabling beam failure detection and optimizing radio link quality monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS frequency density is increased to improve beam failure detection accuracy, then measurement precision is improved, but resource consumption increases
Solution Approach 1:
The patent applies dynamics by making the CSI-RS frequency density adjustable rather than fixed. The network device dynamically configures different frequency densities based on beam failure detection requirements, and the user equipment adapts its monitoring accordingly. This allows the system to optimize between measurement precision and resource consumption by adjusting density based on actual needs rather than using a constant high density.
Solution Approach 2:
The patent changes the parameter of CSI-RS frequency density to resolve the contradiction. By configuring different frequency densities (e.g., different numbers of CSI-RS resources per resource block) based on subcarrier spacing and beam failure detection requirements, the system can achieve adequate measurement precision while controlling resource consumption. The parameter is optimized rather than maximized.
2Speed
If evaluation period is shortened to improve response time for beam failure detection, then speed is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies dynamics by making the evaluation period configurable and adaptable. Instead of using a fixed short evaluation period, the system dynamically adjusts the period length based on the configured frequency density and subcarrier spacing. This allows the system to achieve fast response when conditions permit while maintaining adequate measurement precision by extending the period when necessary.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the evaluation period based on the frequency density and subcarrier spacing before beam failure detection begins. This preliminary configuration ensures that the evaluation period is optimized for the specific deployment scenario, balancing response time and measurement precision from the start rather than adjusting during operation.
3Reliability
If CSI-RS resources are increased to improve beam failure detection, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent changes parameters such as frequency density, subcarrier spacing, and evaluation period to optimize beam failure detection reliability while controlling complexity. By adjusting these parameters rather than simply increasing the number of CSI-RS resources, the system achieves improved reliability through optimized configuration rather than brute-force resource addition, thereby limiting the increase in UE processing complexity.
Data Source
AI summary
Embodiments of a User Equipment (UE), Next Generation Node-B (gNB) and methods of communication are generally described herein. The UE may receive configuration information to configure the UE with a plurality of channel state information reference signal (CSI-RS) resource sets. One of the CSI-RS resource sets may be allocated for beam failure detection (BFD). The UE may determine, based on a sub-carrier spacing (SCS) of a bandwidth part (BWP), a frequency density of the CSI-RS resources in the BWP in terms of a number of resource elements (REs) per resource block (RB). The UE may determine, based on the frequency density of the CSI-RS resources, an evaluation period for CSI-RS based BFD, wherein the evaluation period is longer for higher frequency densities and the evaluation period is shorter for lower frequency densities.