DAPS Handover Selection for High-Frequency Bands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing dual active protocol stack (DAPS) handover method cannot be performed in high-frequency bands, such as Frequency Range 2, which is necessary for maintaining consistent data rates with low interruption times in wireless communication systems.
Innovation Solution
A communication device and method that receives a radio resource control (RRC) configuration message, triggering a handover to a suitable network, and performs a DAPS handover if enabled, or a normal handover if not, to ensure robust handover with low interruption time in high-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If DAPS handover is performed, then handover interruption time is reduced, but it cannot be performed in high frequency bands
Solution Approach 1:
The patent implements dynamic handover method selection, where the communication device determines whether to perform DAPS handover or normal handover based on real-time conditions including frequency band. The device dynamically adjusts the handover approach by checking if the target frequency band supports DAPS handover, and if not, automatically switches to normal handover procedure, thereby adapting the handover mechanism to different operational environments while maintaining low interruption time where possible.
2Adaptability or versatility
If normal handover is performed in high frequency, then frequency compatibility is achieved, but handover interruption time increases
Solution Approach 1:
The patent changes the handover execution parameters based on frequency band characteristics. When operating in high frequency bands that do not support DAPS handover, the device modifies the handover parameters to use normal handover procedure instead. This parameter change allows the system to maintain compatibility with high frequency bands while accepting the trade-off of increased handover interruption time, and the device can optimize other parameters to mitigate this impact.
3Loss of time
If DAPS handover is强制 performed, then low interruption time is achieved, but handover reliability decreases in unsupported frequency bands
Solution Approach 1:
The patent implements a feedback mechanism where the communication device receives information about DAPS handover support from the network or determines it based on frequency band configuration. The device uses this feedback to make an informed decision about whether to attempt DAPS handover. If the feedback indicates DAPS handover is not supported in the current frequency band, the device automatically adjusts its behavior to perform normal handover, thereby ensuring handover execution reliability while maintaining low interruption time where DAPS is supported.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for handling a handover of a communication device (20) includes receiving a radio resource control, RRC, configuration message from a source network, wherein the RRC configuration message comprises at least one RRC configuration of at least one target network (1602); triggering a handover from the source network to a suitable network, wherein the suitable network is one of the at least one target network (1604); and performing a dual active protocol stack, DAPS, handover from the source network to the suitable network, when an enable DAPS condition is satisfied and an RRC configuration of the suitable network comprises a DAPS configuration (1606); or performing a first normal handover from the source network to the suitable network, when the enable DAPS condition is not satisfied (1608).