DRX Configuration During DAPS Handover to Cut NR Power Use
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Solution Overview
Problem
The high beam scanning delay and reduced coverage in new radio (NR) systems due to beamforming lead to increased handover interruption times, reduced reliability, and higher ping-pong handover probabilities, especially for ultra-reliable low-latency communication (URLLC) services, necessitating a solution to minimize power consumption during dual-access protocol stack (DAPS) handovers.
Innovation Solution
Implementing a method where a terminal device determines and configures DRX configuration information independently, consistently, or maintains DRX configuration for both source and target cells during handover, optimizing power consumption by aligning or adjusting DRX cycles and parameters to maximize sleep times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming technology is used to improve signal coverage, then signal quality is improved, but handover interruption time increases
Solution Approach 1:
The terminal device performs random access to the target cell before completely releasing the source cell connection, preparing the handover in advance to minimize interruption time while maintaining signal quality through beamforming
2Reliability
If beam scanning is performed frequently to maintain connection reliability, then handover reliability is improved, but power consumption increases
Solution Approach 1:
The terminal device uses discontinuous reception (DRX) with periodic wake-up intervals to monitor beam conditions, performing beam scanning only at scheduled intervals rather than continuously, thereby maintaining handover reliability while significantly reducing power consumption
3Reliability
If the terminal device monitors both source and target cells simultaneously, then handover reliability is improved, but power consumption increases
Solution Approach 1:
The terminal device initiates random access to the target cell before releasing the source cell connection, preparing the handover in advance. This allows the device to monitor both cells simultaneously only during the transition period, reducing overall monitoring time and power consumption while maintaining handover reliability
Solution Approach 2:
The terminal device uses DRX cycles to periodically monitor both source and target cells, combining dual-cell monitoring with periodic reception to reduce continuous power consumption while maintaining reliable handover through simultaneous connection management
Data Source
AI summary
The disclosure provides communication methods and apparatuses. One example method includes that after receiving a cell handover command, a terminal device determines discontinuous reception (DRX) configuration information of a target cell. The DRX configuration information of the target cell is consistent with DRX configuration information of a source cell. The terminal device exchanges data at least with the source cell based on the DRX configuration information of the source cell, or with the target cell based on the DRX configuration information of the target cell.