Opportunistic Frequency Switching for FBE Cell Acquisition
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Solution Overview
Problem
Wireless communication networks face interference and congestion issues, particularly in high-demand areas, leading to performance degradation and difficulties in accessing shared spectrum, especially in contention-based unlicensed bands, where traditional medium-sensing procedures like LBT can result in communication inefficiencies and hidden node interference.
Innovation Solution
Implementing opportunistic frequency switching with frequency diversity, where user equipment (UE) and base stations use a sequence of carrier frequencies and associated medium sensing occasions to detect interference and switch between frequencies dynamically, optimizing channel access and mitigating outages through synchronized opportunistic frequency switching procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional medium-sensing procedures like LBT are used in contention-based unlicensed bands, then equipment can access shared spectrum, but interference and congestion issues arise leading to performance degradation
Solution Approach 1:
The patent changes the frequency parameter by switching between multiple carrier frequencies (f1, f2, f3) instead of operating on a single frequency. This allows the system to avoid interference and congestion on any individual frequency while maintaining channel access capability in unlicensed bands
Solution Approach 2:
The patent implements dynamic frequency switching where the base station and UE adaptively change operating frequencies based on channel conditions. The switching between frequencies f1, f2, and f3 is dynamic rather than static, allowing the system to respond to changing interference and congestion conditions in real-time
2Reliability
If frequency diversity with multiple carrier frequencies is implemented, then interference and congestion are reduced, but system complexity increases
Solution Approach 1:
The patent segments the communication system into distinct frequency components (f1, f2, f3) with dedicated sensing occasions for each. This segmentation allows independent management of each frequency, simplifying the overall control by treating each frequency as a separate resource that can be managed individually through predefined sensing patterns
Solution Approach 2:
The patent performs preliminary configuration of frequency switching parameters including sensing occasion offsets, frequency offsets, and access information before actual communication begins. This preliminary setup reduces runtime complexity by establishing predetermined patterns that both base station and UE can follow without complex real-time decision-making
Data Source
AI summary
Cell acquisition is disclosed in frequency diversity configured for frame based equipment (FBE) access, such as using opportunistic frequency switching. A user equipment (UE) begins cell acquisition by synchronizing to an available communication channel of an available cell in response to detection of a synchronization signal block (SSB) associated with a network on which the UE communicates. The UE receives system information associated with the available cell from a serving base station, wherein the system information includes identification of at least: a link indicator identifying linked communication channels available for opportunistic switching, sensing occasion offsets for each of the linked channels, and access information associated with each of the linked channels. The UE measures a channel quality for each available channel. The base station transmits this system information on each of the linked channels and then monitors the allocated random access resources for signals from the UEs.