Neighbor Cell Resynchronization Signal Mapping for Narrowband Terminals
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Solution Overview
Problem
User terminals with narrow bandwidths face inefficiencies in receiving resynchronization signals (RSS) of neighbor cells due to limited frequency ranges, necessitating frequent switching and increased processing load.
Innovation Solution
The base station apparatus provides the user terminal with information on the relation between the frequency position of the serving cell's RSS and neighbor cell's RSS, allowing efficient reception by aligning or implicitly indicating the frequency positions, thereby reducing the need for frequent switching and load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user terminal monitors RSS of neighbor cells with narrow bandwidth, then the terminal can receive RSS signals, but the terminal must frequently switch frequency ranges which increases processing load
Solution Approach 1:
The base station apparatus performs preliminary action by providing the terminal with advance information about the frequency position relationship between serving cell RSS and neighbor cell RSS through signaling. This allows the terminal to pre-calculate the target frequency position for neighbor cell RSS without needing to perform exhaustive frequency sweeping, thereby reducing processing load while maintaining reliable RSS reception.
2Adaptability or versatility
If the user terminal switches frequency range to receive neighbor cell RSS, then the terminal can access neighbor cell signals, but the switching operation increases processing complexity and time
Solution Approach 1:
The base station provides preliminary frequency position information for neighbor cell RSS through downlink signaling before the terminal needs to measure neighbor cells. This advance information allows the terminal to directly tune to the correct frequency position without performing time-consuming frequency sweeping or multiple switching operations, thereby reducing measurement time while maintaining versatile neighbor cell detection capability.
Solution Approach 2:
The frequency position relationship information acts as an intermediary that bridges the terminal's knowledge of serving cell RSS frequency and the required neighbor cell RSS frequency. Instead of the terminal needing to independently discover neighbor cell frequency positions through exhaustive searching, the intermediary information from the base station directly provides the mapping relationship, enabling efficient frequency transition.
3Measurement precision
If the user terminal receives detailed frequency position information for all neighbor cells, then the terminal can accurately measure RSS, but the information overhead from base station increases
Solution Approach 1:
Instead of providing complete and detailed frequency position information for all possible neighbor cells uniformly, the base station applies local quality by providing frequency position relationship information selectively based on actual measurement needs and neighbor cell configurations. The information is provided with appropriate granularity and precision for each specific neighbor cell scenario, avoiding unnecessary overhead for cells that don't require detailed positioning while ensuring accurate measurement data when needed.
Data Source
AI summary
A terminal including: a reception unit configured to receive, from a base station apparatus of a serving cell, information indicating a relation between a frequency position of a resynchronization signal of the serving cell and a frequency position of a resynchronization signal of a neighbor cell, wherein the reception unit receives the resynchronization signal of the neighbor cell at a frequency position based on the relation.