Terminal Transmission Gap Utilization for Cell Measurements
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Solution Overview
Problem
Asynchronous operation between GSM and UMTS networks complicates cell measurements, necessitating efficient techniques to quickly and accurately identify better cells for handover in wireless communication networks.
Innovation Solution
A terminal operates in a compressed mode, utilizing multiple transmission gap pattern sequences (GAP1, GAP2, GAP3) to efficiently make cell measurements by alternating between received signal strength indicator (RSSI) measurements, base transceiver station identity code (BSIC) identification, and BSIC re-confirmation, allowing for flexible use of transmission gaps based on specific criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal uses separate transmission gap patterns for RSSI measurements, BSIC identification, and BSIC re-confirmation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes transmission gaps multi-functional by allowing a single transmission gap to serve different purposes (RSSI measurement, BSIC identification, or BSIC re-confirmation) based on dynamic criteria. The transmission gap is used for its designated purpose or for an alternate purpose depending on whether specific criteria are satisfied, enabling one resource to fulfill multiple measurement functions and reducing the need for separate dedicated gaps for each measurement type.
2Reliability
If the terminal completes cell measurements quickly, then handover reliability is improved, but measurement precision may deteriorate
Solution Approach 1:
The patent performs preliminary actions by conducting RSSI measurements first to identify candidate cells, then performing BSIC identification and re-confirmation only on those candidates. This staged approach allows quick initial screening followed by precise verification only when needed, enabling fast handover decisions while maintaining measurement accuracy for the final handover target.
Solution Approach 2:
The patent applies partial action by performing complete measurement sequences (RSSI + BSIC identification + BSIC re-confirmation) only for cells that meet certain criteria, rather than performing all measurements on all cells. The terminal determines whether to perform alternate purpose measurements based on criteria such as signal strength thresholds or measurement results from previous gaps, thereby reducing overall measurement time while maintaining precision for promising candidates.
3Measurement precision
If the terminal uses transmission gaps for their designated purposes only, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the function of transmission gaps to change based on real-time criteria evaluation. The terminal assesses whether criteria are satisfied at each opportunity and dynamically switches between using the gap for its designated purpose or for an alternate purpose. This dynamic approach maximizes measurement throughput by flexibly utilizing available gaps while maintaining measurement quality through criterion-based decision-making.
Data Source
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AI summary
A terminal communicates with a first wireless network and obtains a list of cells in a second wireless network to measure. The terminal operates in a compressed mode and receives multiple transmission gap pattern sequences for different measurement purposes, e.g., RSSI measurements, BSIC identification, and BSIC re-confirmation. The terminal utilizes each transmission gap for its designated purpose or an alternate purpose. For each transmission gap, the designated purpose for the transmission gap is ascertained, and whether the transmission gap is usable for an alternate purpose is also determined based on at least one criterion. The transmission gap is used for the alternate purpose if the at least one criterion is satisfied and is used for the designated purpose otherwise. For example, a transmission gap designated for RSSI measurement may be used for BSIC identification, a transmission gap designed for BSIC identification or BSIC re-confirmation may be used for RSSI measurement, and so on.