Dynamic Serving Cell Bandwidth Parts for Seamless Handover
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Solution Overview
Problem
Current handover processes in wireless communication networks are delayed and interrupt data communication, particularly for delay-sensitive services like voice, due to the need to change bandwidth configurations and security keys, which can disrupt user plane data services.
Innovation Solution
Implementing a dynamic serving cell (DCell) configuration that allows simultaneous or time-division multiplexed data communication using non-overlapping bandwidth parts with the same protocol stack between the source and target network nodes during handover, enabling efficient handover without data interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedure is used to switch from source network node to target network node, then handover can be performed, but data communication is interrupted and handover delay increases
Solution Approach 1:
The patent segments the channel bandwidth into multiple non-overlapping bandwidth parts (first bandwidth part for source network node, second bandwidth part for target network node). This segmentation allows the device to simultaneously communicate with both network nodes without interference, eliminating data interruption during handover while maintaining reliable communication continuity.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the target network node with the second bandwidth part before the actual handover execution. The device receives configuration including both bandwidth parts in advance, enabling it to prepare and switch bandwidth parts smoothly during handover, thereby reducing handover delay and maintaining continuous data communication.
2Adaptability or versatility
If bandwidth configuration changes are performed during handover, then network node switching is enabled, but user plane data services are disrupted
Solution Approach 1:
The patent segments the bandwidth configuration into distinct non-overlapping bandwidth parts, with the first bandwidth part dedicated to the source network node and the second bandwidth part dedicated to the target network node. This segmentation allows the device to maintain simultaneous connections with both network nodes using the same protocol stack, enabling network switching without disrupting user plane data services.
Solution Approach 2:
The patent implements dynamic bandwidth part configuration where the device can flexibly switch between different bandwidth parts based on the active network node connection. The dynamic nature of the bandwidth part allocation allows seamless transition from source to target network node while maintaining continuous data service, enhancing both adaptability and reliability.
3Reliability
If security key changes are performed during handover, then network security is maintained, but communication interruption occurs
Solution Approach 1:
The patent applies preliminary action by pre-establishing the second bandwidth part configuration for the target network node before handover execution. The device receives and processes the target network node configuration in advance, including security parameters, enabling seamless key exchange and security establishment without interrupting communication during the actual handover process.
Data Source
AI summary
An apparatus may receive, from a source network node, a configuration of a channel bandwidth and a first bandwidth part for receiving data from the source network node, for example during a handover from the source network node to a target network node, and a configuration of a second bandwidth part for receiving data from the target network node. The apparatus may communicate data with the source network node and the target network node with a bandwidth including the first bandwidth part and the second bandwidth part using same protocol stack.