Cell Selection Method for Licensed and Unlicensed Bands
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Solution Overview
Problem
In LTE systems, there is a challenge in implementing efficient cell selection and reselection for terminal devices between licensed and unlicensed frequency bands, as the Long Term Evolution (LTE) system's License-assisted Access (LAA) mechanism can only configure a secondary cell on an unlicensed frequency band, and terminal devices cannot camp on unlicensed frequency bands, limiting the flexibility of cell resource management.
Innovation Solution
A method for selecting a cell that involves a terminal device searching for a target frequency point based on pre-configured and dynamically configured information, as well as user-defined working modes, to perform cell selection or reselection on both licensed and unlicensed frequency bands, with priority considerations for frequency bands and cell functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices cannot camp on unlicensed frequency bands in LAA mechanism, then licensed frequency band reliability is maintained, but cell selection flexibility and resource utilization are limited
Solution Approach 1:
The patent implements dynamic cell selection by allowing terminal devices to transition between camping on licensed frequency bands and selecting cells on unlicensed frequency bands based on real-time conditions. The network device dynamically configures frequency point sets and priority information, enabling the system to adapt between reliable licensed band operation and flexible unlicensed band utilization without compromising overall reliability.
2Device complexity
If terminal devices search for target frequency points using only pre-configured information, then device complexity is reduced, but adaptability to dynamic network conditions deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring frequency point sets and priority information in the terminal device before actual cell selection occurs. This pre-configuration reduces real-time processing complexity while still allowing dynamic adaptation through network-provided updates and multiple frequency point options that can be selected based on current network conditions.
3Adaptability or versatility
If multiple frequency point sets with different priorities are configured, then cell selection adaptability is improved, but information management complexity increases
Solution Approach 1:
The patent segments frequency points into multiple organized sets (first frequency point set, second frequency point set, etc.) with different priority levels. This segmentation allows the terminal device to manage complex frequency information in an organized manner, selecting from appropriate sets based on network conditions without being overwhelmed by the full complexity of all available frequency points.
Data Source
AI summary
Embodiments of the present application implement cell selection and cell reselection for a terminal device in a licensed band and an unlicensed band. Disclosed are a method for selecting a cell, a terminal device, and a network device. The method comprises: a terminal device searches for a target frequency point on the basis of at least one of preconfigured first configuration information, of second configuration information configured by a network using a dynamic signaling, and of a work mode set by a user; and performs cell selection or cell reselection on the basis of a state of a cell on the target frequency.