Communication Terminal Cell Search Optimization
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Solution Overview
Problem
Modern wireless communication devices face challenges in efficiently performing cell searches across different radio access technologies (RATs), which requires balancing speed and power consumption, especially during inter-RAT handovers, as excessive antenna usage increases power consumption while single-antenna searches are slow and power-intensive.
Innovation Solution
A communication terminal determines optimal cell search parameters, such as the number of active antennas and search duration, based on location information, device history, and power probe values to prioritize RATs and cells, allowing for a performance-power consumption trade-off, thereby improving cell search speed and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple antennas are used for cell search, then cell search speed is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the number of antennas used for cell search based on real-time conditions such as mobility state, signal quality, and network configuration. The terminal device switches between single-antenna and multi-antenna modes adaptively, rather than using a fixed number of antennas, thereby optimizing the balance between cell search speed and power consumption根据不同场景灵活调整天线数量
Solution Approach 2:
The patent changes key parameters including the number of active antennas, search bandwidth, and search timing based on detected conditions such as RSRP thresholds and mobility states. By adjusting these parameters dynamically, the system achieves faster cell search when needed while conserving power during normal operation, resolving the contradiction between speed and energy consumption
2Use of energy by moving object
If single antenna is used for cell search, then power consumption is reduced, but cell search speed decreases
Solution Approach 1:
The patent applies partial action by using only one antenna for cell search in scenarios where signal conditions are good and mobility is low, sufficient for normal operation. However, when conditions deteriorate (low RSRP, high mobility), the system activates additional antennas to provide the necessary search speed, thus applying exactly the right amount of resource rather than always using maximum capacity
Solution Approach 2:
The system dynamically transitions between single-antenna and multi-antenna configurations based on real-time assessment of signal quality and mobility state, ensuring power efficiency during stable conditions while maintaining search speed capability when conditions require it
3Adaptability or versatility
If cell search is performed across multiple RATs, then handover capability is improved, but time and power consumption increase
Solution Approach 1:
The patent applies local quality by performing comprehensive multi-RAT cell searches only in specific locations or conditions (e.g., cell edges, areas with poor signal quality), while using single-RAT search in areas with good coverage. The network can configure different search behaviors for different geographic areas or signal conditions, optimizing power consumption while maintaining handover capability where needed
Solution Approach 2:
The system changes search parameters such as the set of RATs to search, search bandwidth, and search timing based on current signal conditions and mobility state. When in strong signal areas, the terminal reduces the number of RATs searched; when in weak signal areas or high mobility states, it expands the search to multiple RATs, thus adapting power consumption to actual handover needs
Data Source
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AI summary
According to an example, a communication terminal is described comprising a determiner configured to determine cell search control information including at least a radio access technology to be searched for, a search duration, a number of search iterations, a number of antennas to be used for the search and based on at least one of information about the current radio conditions that the communication terminal is experiencing, position of the terminal, historical information about the presence of the radio cells at the position of the communication terminal, communication terminal attach history in terms of moving from some specific RATs/cells to other specific RATs/cells, proximity sensors' information and a transceiver configured to perform a cell search based on the determined cell search control information.