High-Speed UE Cell Camping Bias for Reliable HST Selection
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Solution Overview
Problem
High-speed user equipment (UE) in environments such as high-speed trains often selects less-reliable non-HST cells due to high mobility, leading to increased power consumption and latency through frequent handovers.
Innovation Solution
Applying biases to favor high-speed train (HST) cells over non-HST cells by measuring and applying power offsets, using databases of HST frequencies and cells, and adjusting cell selection and reselection procedures to ensure HST cells are prioritized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE selects cell based on measured signal power, then UE can quickly establish connection, but UE may select less-reliable non-HST cells leading to frequent handovers and increased power consumption
Solution Approach 1:
The patent applies parameter changes by introducing a bias parameter (power offset) that modifies the cell selection criteria. Instead of selecting cells solely based on measured signal power, the system adjusts the evaluation parameter to favor HST cells by applying a positive power offset to HST cell measurements, thereby changing the selection outcome to prioritize reliable HST cells over stronger but less reliable non-HST cells
Solution Approach 2:
The patent implements local quality by differentiating the evaluation criteria for different cell types. HST cells receive a power offset bias while non-HST cells do not, creating different selection qualities for different local elements (cells) based on their specific characteristics and reliability properties
2Reliability
If UE applies bias to select HST cells, then cell selection reliability improves, but cell selection complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with information about HST cells and their corresponding power offset values before the cell selection process. The UE stores HST cell identifiers and associated bias parameters in advance, so that during cell selection, the UE can quickly identify HST cells and apply the appropriate bias without complex real-time analysis, thereby reducing operational complexity
3Stability of the object's composition
If UE performs frequent handovers to maintain connection, then connection continuity is maintained, but power consumption and latency increase
Solution Approach 1:
The patent applies preliminary anti-action by preemptively biasing cell selection toward HST cells before handover events occur. By applying a power offset that favors HST cells during the initial cell selection and reselection processes, the system prevents frequent handovers from occurring in the first place, thereby eliminating the need for continuous handover operations that would consume power and increase latency
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine that a cell is associated with a deployment mode based on a condition being satisfied, where the deployment mode may be associated with serving one or more UEs travelling at high speeds. The UE may select from one of a frequency-based initial cell selection or a cell-based initial cell selection and may measure one or more frequencies of one or more cells including the cell to obtain a set of measured parameters, each cell corresponding to a respective deployment mode and a respective measured parameter. The UE may select a candidate cell from the one or more cells based on the respective measured parameters of each cell and the respective deployment modes of each cell and may establish a connection with the candidate cell based on the selecting.