User Equipment Frequency Band Locking for Voice Call Stability
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Solution Overview
Problem
Wireless communication devices face challenges in managing frequency bands effectively during communication sessions, as existing technologies do not adequately prevent handoffs to non-selected frequency bands, which can disrupt voice and data communications due to differences in air interface protocols and bandwidth availability.
Innovation Solution
The device initiates a communication session in a selected frequency band and prevents communication in non-selected bands by disabling radios, activating filters, or implementing software-based lockouts, ensuring consistent performance and bandwidth management for the duration of the session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE allows handoff between frequency bands, then the UE can utilize multiple frequency bands for communication, but the communication quality deteriorates due to protocol differences and bandwidth management issues
Solution Approach 1:
The patent segments the frequency band usage by preventing handoff between different frequency bands (e.g., TDD and FDD bands) during active communication sessions. The UE is configured to maintain communication on a selected frequency band and block attempts to switch to other bands, thereby ensuring consistent communication quality while still allowing multi-band operation across different sessions
Solution Approach 2:
The patent implements dynamic frequency band selection where the UE can choose which frequency band to use for communication sessions, and then dynamically prevents handoff to other bands during that session. This dynamic control allows the system to adapt to different communication scenarios (voice vs. data) while maintaining stability within each session
2Reliability
If the UE prevents handoff to non-selected frequency bands, then communication quality and bandwidth management improve, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements self-service by having the UE autonomously manage frequency band selection and handoff prevention without requiring continuous network intervention. The UE automatically selects a frequency band for a communication session and independently enforces restrictions on switching to other bands, reducing the complexity of network-side control while maintaining communication quality
Solution Approach 2:
The patent changes the handoff parameter state by transitioning from allowing free handoff between frequency bands to blocking handoff to non-selected bands. This parameter change is implemented through modification of handoff control messages and radio resource management settings, achieving communication quality improvement with manageable complexity
3Reliability
If the UE uses frequency bands optimized for voice communication, then voice quality improves with lower latency, but data communication bandwidth is reduced
Solution Approach 1:
The patent dynamically adapts frequency band selection based on the type of communication session. For voice calls, the UE selects and locks onto frequency bands optimized for low latency (such as TDD bands), while for data communications it can utilize bands with higher bandwidth capacity. This dynamic adaptation allows the system to optimize for different service requirements without compromising either voice quality or data throughput
Data Source
AI summary
A UE may be configured to support wireless communication in two or more frequency bands. In some embodiments, the UE initiates a first wireless communication session in a first frequency band of the two or more frequency bands, and in response to initiating the wireless communication session in the first frequency band, the UE prevents itself from communicating in a second frequency band of the set of two or more frequency bands until the first wireless communication session has ended. Some embodiments further include subsequently enabling the UE to communicate in the second frequency band of the set of two or more frequency bands in response to ending the first wireless communication session in the first frequency band.