UE Measurement Configuration Using Frequency Chunks for NR Mobility
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Solution Overview
Problem
In NR networks, the flexibility in transmitting synchronization signals across different frequency locations complicates UE's ability to distinguish between cells on different carriers, leading to challenges in configuring and reporting measurement events, thereby limiting inter-frequency and intra-frequency mobility.
Innovation Solution
The implementation of frequency chunks (FC) and resource blocks (FRB) within these chunks allows the UE to perform measurements without retuning, enabling clear differentiation between carriers by associating specific RSs with distinct FC and FRB configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synchronization signals are transmitted at different frequency locations to enable carrier aggregation and inter-frequency measurements, then network flexibility and measurement capability are improved, but UE complexity increases due to the need to distinguish between cells on different carriers
Solution Approach 1:
The patent segments the frequency spectrum into discrete frequency chunks (FC), each containing a specific set of resource blocks (RB). This segmentation allows the UE to associate specific reference signals with specific FC-RB configurations, enabling clear differentiation between cells on different carriers without requiring complex processing. Each FC is further divided into FRBs, creating a hierarchical structure that simplifies measurement configuration and execution.
2Measurement precision
If the UE searches for synchronization signals at all possible frequency locations defined by the synchronization signal frequency raster, then measurement completeness is improved, but measurement time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with frequency chunk (FC) and resource block (FRB) mappings before measurements are performed. The network node provides measurement configuration that includes FC and FRB information, allowing the UE to directly search for synchronization signals at predetermined frequency locations rather than exhaustively searching all possible locations. This pre-provided configuration significantly reduces measurement time while maintaining completeness.
3Adaptability or versatility
If multiple measurement objects are configured to support intra-frequency and inter-frequency measurements, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal measurement framework where a single measurement object can support multiple measurement types (intra-frequency and inter-frequency) by configuring different FC and FRB sets. The same measurement object structure can accommodate various carrier frequencies and cell configurations, eliminating the need for separate measurement objects for different measurement scenarios. This multi-functional approach reduces overall device complexity while maintaining comprehensive measurement capability.
Data Source
AI summary
Systems, methods, and apparatus for performing measurement configuration using a user equipment, UE, and a network node are disclosed. An example method performed by a UE includes receiving a measurement configuration from a network node, where the measurement configuration specifies a reference frequency corresponding to a set of one or more carriers. The measurement configuration further specifies an offset from the reference frequency. The UE performs measurements on a reference signal located at the offset from the reference frequency and uses the measurements for one or more radio operations.