Selective DRS and CRS Cell Measurement via PCID Lists
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need for efficient cell measurement methods that can selectively perform discovery reference signal (DRS) and common reference signal (CRS) measurements, especially in environments with varying channel conditions and multipath fading, where existing methods may not effectively manage resource allocation and interference.
Innovation Solution
A method and device for user equipment (UE) to selectively perform cell measurements using CRS or DRS based on configured physical cell ID (PCID) lists, allowing for CRS-based DRS measurements on specific cells and all-cell DRS measurements when no PCID list is configured, with options for CSI-RS-based configurations, optimizing resource management and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs CRS-based DRS measurement on all cells, then the measurement coverage is comprehensive, but the measurement precision and interference reduction are insufficient for specific cells
Solution Approach 1:
The patent segments the cell measurement process into two distinct types: CRS-based DRS measurement for cells in the PCID list and CRS measurement for cells not in the PCID list. This segmentation allows the UE to apply different measurement methods to different cell types, improving measurement precision for specific cells while maintaining comprehensive coverage through the second measurement type.
Solution Approach 2:
The patent applies local quality by configuring PCID lists that identify specific cells requiring CRS-based DRS measurement. The UE then applies different measurement characteristics to different cells based on their PCID membership, allowing optimized measurement precision for cells in the list while using standard CRS measurement for other cells.
2Measurement precision
If the UE performs CRS-based DRS measurement on cells in PCID list and CRS measurement on other cells, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network configure PCID lists in advance before the UE performs measurements. The UE receives the PCID list configuration from the network, stores it, and then uses it to automatically determine which measurement method to apply to which cells, reducing the complexity of real-time decision-making.
Solution Approach 2:
The patent implements feedback through the network configuring PCID lists based on channel conditions and network topology. The UE uses this feedback information to select appropriate measurement methods, creating a closed-loop system that adapts measurement strategies based on network-state information without requiring complex autonomous decision-making.
3Object-affected harmful factors
If the network configures PCID list for CRS-based DRS measurement, then the interference reduction improves, but the loss of time for measurement configuration increases
Solution Approach 1:
The patent applies preliminary action by having the network configure PCID lists in advance based on predicted channel conditions and interference patterns. This allows the UE to perform targeted CRS-based DRS measurements on cells that are most likely to experience interference, optimizing interference reduction while minimizing the time required for measurement configuration through pre-computed cell identification lists.
Data Source
AI summary
A method by which a terminal performs cell measurement by selectively using reference signals (RSs) is provided. The terminal receives, from a network, a common RS (CRS) measurement configuration and a discovery RS (DRS) measurement configuration with respect to a frequency to be measured. If the network has configured a physical cell ID (PCID) list for CRS-based DRS measurement with respect to the frequency to be measured, DRS measurement is performed on cells included in the PCID list, and CRS measurement is performed on cells not included in the PCID list. If the network has not configured the PCID list for CRS-based DRS measurement with respect to the frequency to be measured, DRS measurement is performed on all cells belonging to the frequency to be measured.