Configured Grant Activation for Low-Latency Bandwidth Part Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently switching between bandwidth parts without increasing signaling overhead and decreasing spectral efficiency, leading to latency issues that degrade quality of service for latency-sensitive services like URLLC and voice calls.
Innovation Solution
Pre-configuration of configured grants on non-active bandwidth parts allows wireless devices to transmit data without waiting for activation signaling, reducing latency and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If configured grant is configured after switching active bandwidth part using RRC signaling, then bandwidth part switching is achieved, but latency increases due to measurement gap and signaling delay
Solution Approach 1:
The patent applies preliminary action by pre-configuring the configured grant on the non-active bandwidth part before the actual bandwidth part switching occurs. The RRC message includes configuration parameters for the configured grant that will be used on the target bandwidth part, so when switching occurs, the wireless device can immediately activate and use the pre-configured grant without waiting for additional signaling or configuration, thus eliminating the latency caused by post-switching configuration.
2Reliability
If measurement gap is introduced for bandwidth part switching, then switching accuracy is improved, but service latency increases for latency-sensitive applications
Solution Approach 1:
The patent eliminates the need for measurement gap by performing the configured grant configuration in advance during the RRC signaling phase. The RRC reconfiguration message contains all necessary parameters for the configured grant on the target bandwidth part, allowing the wireless device to prepare the grant configuration before switching. This preliminary preparation removes the requirement for post-switching measurement gaps, thereby maintaining switching reliability while reducing service latency for URLLC and voice applications.
3Manufacturing precision
If RRC signaling is used to configure granted after bandwidth part switch, then configuration accuracy is ensured, but signaling overhead increases
Solution Approach 1:
The patent merges the configured grant configuration with the bandwidth part switching RRC signaling by including the configured grant parameters within the RRC reconfiguration message that also contains the bandwidth part switching instructions. This consolidation allows the network to configure both the bandwidth part switch and the configured grant in a single signaling operation, ensuring configuration accuracy while avoiding the need for separate dedicated configuration messages, thus reducing overall signaling overhead.
Data Source
AI summary
A wireless device comprises processor(s) and memory storing instructions that, when executed by the processor(s), cause the wireless device to receive, from a base station, one or more messages comprising first configuration parameters of a first bandwidth part and of a second bandwidth part and second configuration parameters of a configured grant of the first bandwidth part. The second configuration parameters comprise an indication of radio resources of the configured grant of the first bandwidth part. The instructions cause the wireless device to activate the first bandwidth part, based on a switch of an active bandwidth part from the second bandwidth part to the first bandwidth part, activate the configured grant according to the second configuration parameters, based on activating the first bandwidth part, and transmit one or more transport blocks via the radio resources.