Bandwidth Part Activation Timer Dynamics for Uplink Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Implicit bandwidth part activation in wireless communication systems can lead to increased uplink data transmission latency and signaling load when a timer expires, causing wireless devices to interrupt ongoing procedures and restart them, which is undesirable.
Innovation Solution
Implementing techniques for implicit bandwidth part activation and deactivation that allow procedures to complete on a non-default bandwidth part even after the activation timer expires, thereby delaying or avoiding fallback to the default bandwidth part during exceptional cases like ongoing uplink data transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If implicit bandwidth part activation with timer expiration is used to switch bandwidth parts, then bandwidth part switching is automated, but uplink data transmission latency increases and signaling load increases when procedures are interrupted
Solution Approach 1:
The patent makes the bandwidth part activation timer dynamic by allowing it to be extended or suspended when uplink data transfer procedures are detected. The timer behavior changes based on system state: it expires normally when no procedures are active, but is extended when procedures like random access or scheduling requests are in progress, thus adapting the automation to avoid interrupting ongoing operations.
Solution Approach 2:
The system implements feedback mechanisms where the network monitors the status of uplink data transfer procedures and provides feedback to control timer expiration. When procedures are detected as ongoing, the network sends signals to extend or suspend the timer, creating a closed-loop control system that prevents unnecessary bandwidth part switching and reduces latency.
2Extent of automation
If implicit bandwidth part activation with timer expiration is used to switch bandwidth parts, then bandwidth part switching is automated, but signaling load increases due to procedure restarts
Solution Approach 1:
The timer mechanism is made dynamic by adjusting its expiration behavior based on the presence of ongoing uplink procedures. When procedures are active, the timer is extended or suspended, preventing the bandwidth part switch that would otherwise occur at expiration. This dynamic adjustment eliminates the need for procedure restarts and reduces signaling load while maintaining automated switching when appropriate.
Solution Approach 2:
The network implements feedback monitoring of uplink procedure status to control timer behavior. When procedures like random access or scheduling requests are detected as in progress, the network provides feedback signals to extend the timer, preventing expiration-induced switching. This feedback loop reduces unnecessary signaling from procedure restarts while preserving automated bandwidth part management.
3Ease of operation
If fallback to default bandwidth part is triggered by timer expiration, then bandwidth part activation is simplified, but ongoing procedures are interrupted causing increased latency
Solution Approach 1:
The fallback mechanism is made dynamic by conditionally preventing timer expiration based on ongoing procedures. The simple timer-based fallback remains in effect when no procedures are active, maintaining ease of operation. When procedures are detected as in progress, the timer is extended or suspended, dynamically adapting the fallback behavior to preserve ongoing operations and avoid unnecessary delays.
Solution Approach 2:
The system uses feedback monitoring of procedure status to control whether fallback occurs at timer expiration. When uplink procedures are active, feedback signals extend or suspend the timer, preventing premature fallback that would interrupt procedures. This feedback-controlled approach maintains the simplicity of timer-based activation while avoiding the harm of interrupting ongoing operations.
Data Source
AI summary
This disclosure relates to performing bandwidth part activation in a cellular communication system. A wireless device may attach to a network via a cell that includes multiple bandwidth parts. The wireless device may receive an indication activating a non-default bandwidth part for the wireless device. A bandwidth part activation timer may be initiated based at least in part on activation of the non-default bandwidth part. At expiration of the bandwidth part activation timer, the wireless device may deactivate the non-default bandwidth part and activate a default bandwidth part if there is not a procedure to perform an uplink data transfer in progress. If there is a procedure to perform an uplink data transfer in progress at expiration of the bandwidth part activation timer, the procedure may be completed via the non-default BWP even after expiration of the bandwidth part activation timer.