Bandwidth Part Switching for Multi-Subscription Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, multiple-subscription devices face challenges in efficiently managing and switching between bandwidth parts (BWP) when switching between different radio access technologies (RATs), leading to undesirable behavior and potential loss of BWP switching commands.
Innovation Solution
The method involves a user equipment (UE) communicating with a first RAT over a set of configured BWPs, tuning away to a second frequency for a period to communicate with a second RAT, and then returning to the selected BWP to send a scheduling request, while maintaining an inactivity timer to manage BWP switching and handle missed switching commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transceiver tunes away from the current BWP to communicate with a second RAT, then communication with the second subscription is enabled, but the BWP switching command from the first RAT may be missed and communication continuity is disrupted
Solution Approach 1:
The UE determines whether it is currently in a BWP switching process before tuning away to the second RAT. By checking the BWP switching state in advance (preliminary action), the UE can decide whether to delay the tune-away operation until the BWP switching is complete, thereby preventing loss of BWP switching commands while still enabling multi-subscription communication
Solution Approach 2:
The UE dynamically adjusts its operation by conditionally delaying the tune-away to the second RAT based on the current BWP switching state. If a BWP switching command is detected, the UE postpones the frequency transition; otherwise, it proceeds with the tune-away. This dynamic decision-making ensures both reliable BWP switching and flexible multi-RAT communication
2Reliability
If the UE delays BWP switching to avoid missing commands during tune-away, then BWP switching reliability is improved, but communication latency with the first RAT increases
Solution Approach 1:
The UE applies partial delay only when necessary - specifically when a BWP switching command is detected during the tune-away period. The delay is not always applied; it is selectively used only when needed to prevent command loss. This partial action approach minimizes latency while maintaining reliability
3Productivity
If the UE frequently switches between BWPs to optimize resource allocation, then spectral efficiency is improved, but the complexity of managing multiple BWPs across subscriptions increases
Solution Approach 1:
The UE implements a feedback mechanism by monitoring whether BWP switching commands are received during tune-away periods. Based on this feedback, the UE adjusts its BWP switching behavior - delaying switches when commands are detected and proceeding normally when they are not. This feedback-driven approach optimizes spectral efficiency while preventing management complexity from becoming unmanageable
Data Source
AI summary
Aspects described herein relate to communicating, based on a first subscription, with a first Radio Access Technology (RAT) over a bandwidth part (BWP) in a set of one or more configured BWPs, tuning a transceiver away from the BWP to a second frequency to communicate, based on a second subscription, with a second RAT for a period of time, tuning, after the period of time, the transceiver back to a selected BWP to communicate with the first RAT, and handling BWP parameters during or based on the tune away or tune back.