Radio Base Station PRS Transmission for Mobile Station Synchronization
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Solution Overview
Problem
In the current LTE-Rel. 9 scheme, mobile stations UE face complexity in configuring PRS reception due to the need to detect both Normal CP and Extended CP transmission patterns, leading to increased PRS reception processing time.
Innovation Solution
A radio base station transmits the length of the cyclic prefix used in neighboring cells, allowing mobile stations to receive a reference signal generated based on this length, enabling the measurement of propagation delay differences without requiring separate configurations for Normal and Extended CP patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate PRS transmission patterns are defined for Normal CP and Extended CP cases, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent defines a unified PRS transmission pattern that can be applied to both Normal CP and Extended CP cases. The base station transmits a single PRS pattern configuration that works universally across different CP types, eliminating the need for separate pattern definitions. This universal approach maintains measurement precision while significantly reducing mobile station configuration complexity.
Solution Approach 2:
Instead of defining separate PRS transmission patterns for different CP types, the patent changes the approach by using a single pattern definition with parameters that adapt to different CP configurations. The mobile station determines the appropriate pattern based on CP length information received from the base station, rather than maintaining separate configurations for Normal and Extended CP cases.
2Measurement precision
If mobile station detects both Normal CP and Extended CP PRS patterns, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent extracts the CP type determination logic from the PRS detection process itself. The base station explicitly provides CP length information to the mobile station through higher-layer signaling, allowing the mobile station to select the appropriate PRS pattern without performing exhaustive detection of both Normal CP and Extended CP patterns. This extraction of determination logic significantly reduces processing time while maintaining measurement precision.
3Adaptability or versatility
If separate PRS transmission patterns are configured for different CP types, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic selection of PRS patterns based on real-time CP length information. The mobile station dynamically determines which PRS pattern to use by receiving CP length indications from the base station, rather than being statically configured with separate patterns for Normal and Extended CP. This dynamic approach provides adaptability to different CP types while simplifying the overall configuration.
Data Source
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AI summary
A radio base station eNB according to the present invention includes: an upper-layer information transmission unit 11 configured to transmit a length of CP used in neighbouring cells #1 to #3; and a PRS transmission unit 12 configured to transmit, when the subordinate cell #2 is included in the neighbouring cells #1 to #3, the PRS generated based on the length of CP, in the subordinate cell #2.