RSSI Measurement Timing Reference in NR Uplink Interference
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Solution Overview
Problem
In new radio (NR) networks, performing accurate received signal strength indication (RSSI) measurements is complex due to the need for cell-specific timing reference and uplink interference handling, which increases user equipment (UE) complexity, especially during intra- and inter-frequency measurements.
Innovation Solution
The method involves configuring RSSI measurement time slots and OFDM symbols using high-layer signaling, allowing the UE to assume the frame boundary timing reference of the serving or detected cells, and deriving the timing location based on subcarrier spacing for synchronization signal blocks, thereby simplifying the measurement process and avoiding uplink symbols during time division duplex configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell-specific timing reference and uplink interference handling are implemented for accurate RSSI measurements, then measurement accuracy is improved, but UE complexity increases
Solution Approach 1:
The patent applies parameter changes by configuring specific time slots and OFDM symbols for RSSI measurements through high-layer signaling. The measurement parameters include slot indices, symbol indices, and subcarrier spacing configurations that change based on network conditions. This allows accurate RSSI measurements to be performed at predetermined times without requiring complex real-time timing reference calculations at the UE, thus improving measurement accuracy while controlling UE complexity.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the timing reference and measurement resource locations through high-layer signaling before actual RSSI measurements are performed. The UE receives configuration parameters including slot offsets, symbol offsets, and subcarrier spacing in advance, allowing it to perform measurements at predetermined locations without complex real-time processing. This preliminary configuration resolves the contradiction by enabling accurate measurements through pre-planned resource allocation rather than complex runtime calculations.
2Measurement precision
If standardized timing reference configuration is implemented across cells, then RSSI measurement accuracy is improved, but flexibility in handling different cell configurations is reduced
Solution Approach 1:
The patent applies universality by designing a standardized timing reference configuration mechanism that works across different cell types and configurations. The high-layer signaling configuration uses universal parameters such as slot offsets, symbol offsets, and subcarrier spacing that can be applied to any cell. This standardized approach enables consistent RSSI measurement accuracy across diverse network scenarios while maintaining adaptability through parameter customization within the universal framework.
Solution Approach 2:
The patent resolves the contradiction between standardization and flexibility through parameter changes. The configuration includes adjustable parameters such as slotOffset, symbolOffset, and subcarrierSpacing that can be modified based on specific network conditions while maintaining a standardized measurement framework. This allows the system to adapt to different cell configurations by changing parameters rather than requiring different measurement mechanisms, thus preserving both measurement accuracy and configuration flexibility.
Data Source
AI summary
A method of performing received signal strength indication (RSSI) measurements in new radio (NR) networks is proposed. When RSSI-Measurement time slots and OFDM symbols are configured by high-layer signaling, UE can assume the timing reference of a target carrier is the frame boundary of the serving cell or any detected cells on that carrier. UE then performs RSSI measurements according to the timing reference and the configured RSSI-Measurement slot/symbol. UE derives the timing location of the configured slot/symbol according to the timing reference and the subcarrier spacing (SCS) of the synchronization signal block (SSB) in the target carrier.