Terminal Device Cell Selection Using Multi-Parameter Measurement
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Solution Overview
Problem
Current wireless communications systems face challenges in selecting an optimal cell for terminal devices in future evolved wireless communications systems, especially when interacting with existing systems, as traditional cell access procedures are no longer applicable and require consideration of multiple factors like signal strength, load, interference, and backhaul link capacity.
Innovation Solution
A terminal device is configured to receive and measure various types of information from multiple cells across different wireless communication systems, including RSRP, RSRQ, cell load, interference, and backhaul link capacity, to select a target cell and control access to the core network using a processor and transmitter, with access information sent between network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional cell access procedures are used in future evolved wireless communications systems, then the access process is simple, but the system cannot properly handle multiple factors like signal strength, load, interference, and backhaul link capacity
Solution Approach 1:
The cell selection process is segmented into multiple independent measurement components (RSRP measurement, RSRQ measurement, load information evaluation, interference measurement, backhaul link capacity evaluation) that can be processed separately and then integrated, making the complex selection process more manageable and systematic
Solution Approach 2:
The terminal device performs preliminary measurements of RSRP and RSRQ, and obtains preliminary information about load, interference, and backhaul capacity before making the final cell selection decision. This preliminary action allows the system to consider multiple factors in advance rather than making decisions based on incomplete information
2Measurement precision
If the terminal device measures and considers multiple cell parameters (RSRP, RSRQ, load, interference, backhaul capacity), then the cell selection quality improves, but the measurement and processing time increases
Solution Approach 1:
The terminal device performs measurements of RSRP and RSRQ and obtains information about load, interference, and backhaul capacity in advance before the cell selection decision is required. This preliminary measurement approach ensures that all necessary data is available when selection is needed, improving accuracy without causing time loss during the actual selection moment
Solution Approach 2:
The terminal device autonomously performs the measurements and evaluations itself without requiring external assistance for each measurement type. The device self-manages the collection of RSRP, RSRQ, load, interference, and backhaul capacity information, reducing coordination overhead and time loss
3Measurement precision
If the terminal device autonomously selects the target cell based on multiple measurements, then the selection accuracy improves, but the device complexity increases
Solution Approach 1:
The terminal device divides the cell selection task into separate functional modules: RSRP measurement module, RSRQ measurement module, load information processing module, interference measurement module, and backhaul capacity evaluation module. Each module handles a specific aspect independently, reducing the complexity of any single module while maintaining overall selection accuracy
Solution Approach 2:
The terminal device dynamically adjusts its measurement and evaluation process based on the specific conditions of different cells and the current communication requirements. The device can adaptively prioritize certain measurements over others depending on the situation, making the complex selection process more flexible and manageable
Data Source
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AI summary
This application relates to wireless communications technologies, and in particular, to a terminal device, a network device, a cell selection method, and a wireless communications system, so as to provide a solution for selecting a cell in a future evolved wireless communications system. In the cell selection method, a terminal device sends cell information of at least one cell in a first wireless communications system to a second network device in a second wireless communications system, so that the second network device can select a target cell in the first wireless communications system; and the terminal device accesses the target cell selected by the second network device, and accesses a core network in the first wireless communications system by using a first network device to which the target cell belongs. The terminal device provides the cell information, and the second network device selects the target cell. This implements cell selection in the future evolved second wireless communications system.