Vehicle-Mounted Relay Mobility Information for Cell Handover
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Solution Overview
Problem
The mobility of base stations in wireless communication systems, particularly in urban environments, poses challenges due to real estate availability, costs, and regulatory constraints, and existing technologies lack effective methods to manage the mobility of base stations, affecting cellular coverage and user connectivity.
Innovation Solution
The implementation of a wireless terminal and access node system that receives and transmits neighboring cell mobility information, allowing wireless terminals to determine the mobility state of neighboring cells, enabling efficient cell reselection and handover procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If base stations are installed on buildings or infrastructure sites to provide coverage, then cellular coverage and capacity are improved, but real estate availability and costs worsen due to deployment challenges and regulatory constraints
Solution Approach 1:
The patent applies the dynamics principle by transitioning from static base station installations on buildings to mobile base stations mounted on vehicles. This allows the base stations to move geographically and dynamically adjust coverage areas to match user mobility patterns, particularly in urban environments where users move between locations. The mobile base stations can be deployed on vehicles that travel along predictable routes, providing continuous coverage without requiring permanent infrastructure installation at every location.
2Adaptability or versatility
If vehicle relays are deployed to provide mobile coverage, then deployment flexibility is improved, but managing the mobility of these relays becomes more complex as existing technologies lack effective methods to handle base station mobility
Solution Approach 1:
The patent applies preliminary action by having wireless terminals proactively determine the mobility states of neighboring cells before handover is needed. The terminal receives mobility information from serving and neighboring cells, determines whether each cell is mobile or stationary in advance, and uses this information to guide cell reselection and handover decisions. This preliminary determination simplifies the actual handover process by providing the terminal with advance knowledge of cell mobility characteristics.
Solution Approach 2:
The patent implements feedback mechanisms where mobile base stations transmit their mobility state information to wireless terminals. The terminals receive this feedback, process it to determine cell mobility states, and use this information to make informed decisions about cell reselection and handover. This feedback loop enables the system to adapt to the dynamic environment without requiring complex centralized control.
3Reliability
If wireless terminals perform cell reselection based on traditional methods, then connectivity is maintained, but connectivity stability deteriorates when base stations move geographically due to lack of mobility awareness
Solution Approach 1:
The patent applies segmentation by dividing the cell selection process into distinct phases: receiving mobility information from serving and neighboring cells, determining mobility states separately for each cell, and then using this segmented information to make handover decisions. This segmentation allows the terminal to independently evaluate each neighboring cell's mobility characteristics and make more accurate reselection decisions.
Solution Approach 2:
The patent introduces mobility state information as an intermediary element between the physical cell signals and the terminal's handover decisions. Rather than making handover decisions based solely on signal strength, the terminal uses mobility state information as an additional criterion to evaluate whether a neighboring cell is suitable for handover. This intermediary information helps the terminal avoid handovers to cells that are moving away, thereby maintaining connectivity stability.
Data Source
AI summary
A wireless terminal of a cellular telecommunication system which comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, from a serving cell, neighboring cell mobility information, the neighboring cell mobility information being associated with an identity of a neighboring cell. The processor circuitry is configured to determine, based on the neighboring cell mobility information, mobility state of the neighboring cell.