Dual-Mode Adjacent Cell Measurement Using Dormant Idle Sub-frames
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There are no established methods for measuring TD-SCDMA adjacent cells in the WCDMA mode and WCDMA adjacent cells in the TD-SCDMA mode, leading to a lack of standards for interference avoidance and efficient cell switching.
Innovation Solution
A method is developed to measure TD-SCDMA adjacent cells in WCDMA mode by using dormant idle WCDMA sub-frames and idle windows for data reception, and to measure WCDMA adjacent cells in TD-SCDMA mode through synchronization processing and signal code power calculation, enabling effective cell reselection and switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a terminal uses dormant idle WCDMA sub-frames to receive TD-SCDMA adjacent cell data, then measurement capability is improved, but device complexity increases due to dual-mode operation requirements
Solution Approach 1:
The patent divides the measurement process into distinct segments: using dormant idle WCDMA sub-frames for TD-SCDMA adjacent cell measurement in idle state, and using idle windows in connected state. This segmentation allows the terminal to perform measurements without continuous dual-mode operation, reducing overall device complexity while maintaining measurement capability.
Solution Approach 2:
The patent performs preliminary synchronization and frequency point adjustments during idle periods before actual measurement. By pre-configuring the terminal with TD-SCDMA system parameters and performing coarse synchronization in advance, the measurement process becomes simpler and requires less complex real-time processing.
2Measurement precision
If the terminal performs coarse synchronization and automatic gain control adjustment on multiple frequency points, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent implements periodic measurement cycles where the terminal performs AGC adjustment and coarse synchronization on frequency points at scheduled intervals using dormant idle sub-frames. This periodic approach allows measurements to be distributed over time rather than concentrated, maintaining accuracy while managing measurement duration through efficient use of available idle periods.
3Reliability
If the terminal reports received signal code power measurements three times with averaging, then measurement reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal reports RSCP measurements multiple times and the network side uses averaging to obtain reliable measurement results. This feedback loop allows the network to verify measurement consistency and improve reliability through statistical processing, while the overhead is managed by reporting only essential averaged results in the final measurement report.
Data Source
AI summary
The present invention discloses a method for measuring adjacent cells, and the method is used for measuring adjacent cells by using dormant idle sub-frames to receive specified data from a network side in an idle state, and adjacent cells are measured by using an idle window to receive the specified data from the network side in a connection state. The present invention realizes measurement of the TD-SCDMA adjacent cells in a WCDMA mode and measurement of the WCDMA adjacent cells in a TD-SCDMA mode; and further more achieves reselection and switching from WCDMA to TD-SCDMA adjacent cell and from the TD-SCDMA to WCDMA adjacent cell on this basis, meets a real-time requirement effectively, and has high practical value.