CSI-RS Activation Before Handover Completion
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Solution Overview
Problem
In wireless communication standards like LTE and NR, the activation of CSI-RS resources is typically delayed until after a handover is complete, leading to potential delays in accessing narrow beams in target cells, especially for devices using high data rate services, which can result in non-seamless mobility.
Innovation Solution
The proposed solution involves activating CSI-RS configurations before the completion of a handover by including MAC CE commands in the handover command or random access messages, allowing for earlier activation of CSI-RS resources and enabling faster beam usage by configuring aperiodic or semi-persistent CSI-RS resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI-RS resources are activated after handover completion, then the handover procedure is completed, but the delay in accessing narrow beams in target cells increases
Solution Approach 1:
The patent applies preliminary action by activating CSI-RS resources before handover completion. The MAC CE command is sent to the wireless device prior to completing the handover procedure, enabling the device to prepare for and access narrow beams in the target cell in advance, thus reducing the time delay when the patent activates CSI-RS resources before handover completion through MAC CE commands, the system performs preliminary configuration of beamforming resources, allowing the wireless device to access narrow beams sooner in the target cell without compromising handover completion reliability
2Loss of time
If CSI-RS resources are activated before handover completion, then the delay in accessing narrow beams is reduced, but the complexity of coordination between network nodes increases
Solution Approach 1:
The patent uses the MAC CE command as an intermediary mechanism to coordinate between the target network node and the wireless device. This standardized control element simplifies the coordination complexity by providing a pre-defined protocol for activating CSI-RS resources, avoiding the need for complex custom coordination procedures between network nodes while enabling timely resource activation
3Loss of time
If MAC CE commands are included in handover command or random access messages, then the activation of CSI-RS resources occurs earlier, but the message size increases
Solution Approach 1:
The patent merges the MAC CE command for CSI-RS activation with existing handover command or random access messages. By combining multiple control functions into a single message transmission, the system achieves earlier activation of CSI-RS resources without proportionally increasing overall message size, as the MAC CE is integrated into already-transmitted signaling structures
Data Source
AI summary
A method, network node and wireless device are provided. A wireless device for wireless communications is provided. The wireless device includes processing circuitry including a processor and a memory, the memory configured to store instructions that, when executed by the processor, configure the wireless device to: receive activation information before a completion of a handover of the wireless device from a serving network node to a target network node where the activation information indicates a first set of a plurality of sets of reference signal configurations has been activated for reference signal feedback, and provide reference signal feedback based on the first set of the plurality of sets of reference signal configurations.