UE RSSI Measurement QCL Assumption FR2-2 Beamforming
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Solution Overview
Problem
In mobile communications, particularly under 3GPP standards for 5G New Radio (NR), determining the Transmission Configuration Indicator (TCI) for Received Signal Strength Indicator (RSSI) measurement in the FR2-2 band is challenging when TCI is not provided by the network, necessitating a suitable assumption by User Equipment (UE) for accurate beamforming.
Innovation Solution
The UE determines a quasi-co-location (QCL) assumption for RSSI measurement by referring to TCI corresponding to other component carriers in the same FR2-2 band, assuming intra-frequency or inter-frequency RSSI measurements based on available TCI, allowing for proper beamforming and accurate measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCI is not provided by the network, then the UE must make assumptions for RSSI measurement, but the measurement accuracy deteriorates without proper TCI information
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure QCL assumptions and TCI states for RSSI measurements before the actual measurement takes place. The network provides QCL-TypeD configurations that establish spatial relationship assumptions in advance, allowing the UE to perform accurate RSSI measurements even when real-time TCI information is not available. This pre-configuration ensures measurement reliability while maintaining precision.
2Measurement precision
If the network provides TCI for every RSSI measurement, then measurement accuracy improves, but the signaling overhead and network complexity increases
Solution Approach 1:
The patent applies universality by creating a multi-functional QCL configuration mechanism that serves multiple purposes: it provides spatial relationship information for beamforming, establishes TCI state assumptions for RSSI measurements, and reduces signaling overhead. The QCL-TypeD configuration acts as a universal reference that can be reused across multiple RSSI measurement scenarios, eliminating the need for separate TCI provisions for each measurement while maintaining accuracy.
3Ease of operation
If the UE assumes QCL for RSSI measurement without network provision, then the system operates autonomously, but the beamforming direction accuracy deteriorates
Solution Approach 1:
The patent introduces QCL configuration as an intermediary between the network and UE autonomy. Instead of the UE making completely independent assumptions or the network directly controlling every measurement parameter, the QCL configuration serves as a mediator that provides standardized spatial relationship information. This intermediary structure allows the UE to operate autonomously in determining beamforming directions while ensuring accuracy through network-provided QCL references that establish reliable spatial relationships.
Data Source
AI summary
Examples pertaining to determining transmission configuration indicator (TCI) for received signal strength indicator (RSSI) measurement in mobile communications are described. A user equipment (UE) determines a quasi-co-location (QCL) assumption with respect to a received signal strength indicator (RSSI) responsive to not receiving a TCI from a network. The UE also performs an RSSI measurement based on the determined QCL assumption in an expanded Frequency Range 2 (FR2-2) band according to a 3rd Generation Partnership Project (3GPP) specification.