Bandwidth Part Switch Operations in Mobile Communications
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Solution Overview
Problem
In mobile communications, especially in New Radio (NR) systems, the bandwidth part (BWP) switch operations cause interruptions in uplink signal transmission and downlink signal reception due to the need for UE to re-calibrate its RF chain for different BWP configurations, leading to unclear transmission capabilities during the switch process.
Innovation Solution
The proposed solution involves configuring the UE to determine whether to perform uplink or downlink signal transmissions during BWP switch operations, allowing it to switch from an old BWP to a new BWP without interruptions by canceling transmissions/receptions during a specified time duration and performing the switch within that duration, ensuring no data or control signals are processed during the switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs BWP switch operations to adapt to different frequency configurations, then the adaptability of the communication system is improved, but transmission interruptions occur during the switch process
Solution Approach 1:
The network node schedules the BWP switch to occur in a specific slot that is determined in advance, allowing the UE to prepare for the switch beforehand. The time duration for the BWP switch is configured by the network node, enabling the UE to cancel upcoming transmissions or receptions proactively before the switch occurs, thus avoiding transmission errors during the transition.
2Reliability
If the UE cancels uplink transmission or downlink reception during BWP switch time duration, then transmission errors are avoided, but loss of time occurs during the cancellation period
Solution Approach 1:
The network node configures the time duration for BWP switch cancellation by adjusting parameters such as the switch offset and slot timing. By optimizing these parameters, the network can minimize the cancellation period while ensuring that the UE has sufficient time to complete the BWP switch without causing transmission errors. The flexible configuration allows adaptation to different traffic patterns and switch scenarios.
Data Source
AI summary
Various solutions for bandwidth part (BWP) switch operations with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a first downlink control information (DCI) to activate a BWP switch. The apparatus may cancel an uplink transmission or a downlink reception during a time duration. The apparatus may perform the BWP switch within the time duration.