Coordinated TDM Pattern for DAPS Handover Service Continuity
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Solution Overview
Problem
Current dual active protocol stack (DAPS) handover mechanisms in wireless communication systems, particularly in 5G networks, face challenges such as service interruption and lack of robustness due to unstable channel conditions during handovers, especially at higher frequencies where devices may not be able to simultaneously listen to both source and target cells.
Innovation Solution
Implementing a coordinated receive (or transmit) pattern using time division multiplexing (TDM) patterns, where user equipment (UE) is configured to listen to the source cell using one TDM pattern and the target cell using another, based on conditions set by the network nodes, allowing simultaneous communication and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE simultaneously listens to both source and target cells during handover, then service continuity is improved, but at higher frequencies the UE cannot simultaneously listen to both cells due to hardware limitations
Solution Approach 1:
The patent segments the listening/receiving function into different time slots using TDM patterns. Instead of requiring simultaneous listening to both source and target cells (which is impossible at higher frequencies), the UE alternates between listening to source cell and target cell in different time slots, achieving effective service continuity through time-division multiplexing
Solution Approach 2:
The patent introduces dynamic TDM patterns that can be configured and adjusted based on the frequency band and channel conditions. The network can dynamically configure different TDM patterns (e.g., different slot allocations, different listening intervals) to adapt to varying operational requirements, making the system flexible across different frequency ranges
2Loss of time
If TDM patterns are configured for simultaneous communication with source and target cells, then service interruption time is reduced, but device complexity increases due to coordinated pattern management
Solution Approach 1:
The patent enables the UE to autonomously apply the configured TDM patterns without requiring complex real-time coordination or signaling during handover. The network provides the TDM pattern configuration in advance, and the UE self-manages the time-division listening schedule, reducing the need for complex coordinated control mechanisms
Solution Approach 2:
The TDM patterns and their configurations are established in advance during the handover preparation phase, before the actual handover execution. This preliminary configuration allows the UE to seamlessly switch between source and target cells during handover without requiring complex real-time decision-making or coordination, thereby reducing service interruption
Data Source
AI summary
A method, apparatus, and a computer-readable storage medium are provided for a coordinated receive (or transmit) pattern during a DAPS handover. In an example implementation, the method may include a UE sending a measurement report to a first network node, the measurement report including at least a request for a time division multiplexing pattern. The method may further include receiving a radio resource control configuration from the first network node, the radio resource control configuration including at least the time division multiplexing pattern.