NR Measurement Gap Patterns for PRS Accuracy
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Solution Overview
Problem
Current measurement gaps in New Radio (NR) networks do not adequately accommodate both positioning reference signal (PRS) measurements and other NR data scheduling, and there is a need for enhanced mechanisms to determine reference signal time difference (RSTD) measurement delays for PRS measurements.
Innovation Solution
Introduce new measurement gap patterns that allow for longer measurement gaps to support higher PRS repetitions, and enable UE capabilities to indicate extended gap requirements or cut-off PRS repetitions, with adaptive gap allocation based on PRS pattern information from the NR-PP server.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current measurement gaps are used for PRS measurements, then other NR data scheduling can be accommodated, but there is not enough room to accommodate both PRS measurements and other legacy NR RRM measurements
Solution Approach 1:
The measurement gap pattern is made dynamic and configurable, allowing the network to adaptively select from multiple gap patterns (e.g., pattern 0, pattern 1, pattern 2) based on the specific measurement requirements. This enables the system to optimize between accommodating multiple measurement types and maintaining measurement accuracy by selecting appropriate gap configurations for different scenarios
Solution Approach 2:
The invention introduces configurable parameters including measurement gap length (e.g., 1.5ms, 3ms, 6ms), measurement gap repetition period, and the number of PRS repetitions within the gap. By changing these parameters, the system can accommodate both PRS measurements and other NR RRM measurements while maintaining sufficient measurement accuracy through optimized parameter selection
2Measurement precision
If measurement gap length is extended to support higher PRS repetitions, then RSTD measurement accuracy is improved, but UE complexity and processing requirements increase
Solution Approach 1:
The invention allows the UE to indicate its capability regarding the maximum number of PRS repetitions it can process within a measurement gap. The network then configures an appropriate number of repetitions that is sufficient for accurate RSTD measurement but does not exceed the UE's processing capabilities, avoiding unnecessary complexity while maintaining measurement accuracy
Solution Approach 2:
The UE provides capability information to the network in advance, indicating its processing limits for PRS repetitions. This preliminary action allows the network to pre-configure appropriate measurement gap patterns and repetition numbers that match the UE's capabilities, preventing excessive processing requirements before they occur
3Measurement precision
If measurement gap pattern is configured for inter-frequency PRS measurements, then positioning accuracy is improved, but overlap with other NR data scheduling may occur
Solution Approach 1:
The invention segments the measurement gap configuration into multiple distinct patterns, each optimized for specific scenarios. The network can select and activate appropriate patterns based on whether inter-frequency or intra-frequency measurements are needed, and whether other NR RRM measurements are scheduled, thereby avoiding overlap and maintaining scheduling efficiency while ensuring measurement accuracy when required
Data Source
AI summary
An apparatus of a New Radio (NR) Node B (gNB), a method, and a storage medium. One or more processors of the apparatus are to: encode for transmission to a user equipment (UE) a message to configure the UE with a measurement gap pattern for positioning reference signal (PRS) measurements; and set a gap pattern length of a measurement gap corresponding to the measurement gap pattern depending on whether an overlap exists between a PRS to be measured and one or more other NR data scheduled to be received by the UE.