PHY/MAC Layer Indication for Fast Data Path Switching
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing data path switches during user equipment (UE) cell changes, leading to potential interruptions and increased overhead, particularly in dynamic mobility scenarios.
Innovation Solution
The proposed method involves detecting conditions related to UE cell switches via physical (PHY) layer or medium access control (MAC) layer signaling and transmitting indications to trigger data forwarding through a second data path, allowing for efficient data path switching while minimizing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional data path switching methods are used during UE cell changes, then network control and management are maintained, but interruption time increases and switching efficiency decreases
Solution Approach 1:
The source DU transmits an indication message to the CU in advance when a cell switch condition is detected, triggering the CU to prepare and establish the second data path before the UE actually switches cells. This preliminary action eliminates waiting time during the handover process.
Solution Approach 2:
The patent introduces an indication message as an intermediary signal between the source DU and CU. This message carries cell switch condition information and triggers the data path switching process, enabling fast and coordinated path transition without direct UE-CU interaction delays.
2Loss of time
If proactive data path switching is implemented, then interruption time is reduced, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential cell switch condition information into a compact indication message transmitted from source DU to CU. This selective extraction of necessary information minimizes signaling overhead while still enabling proactive data path switching.
Solution Approach 2:
The indication message format and transmission timing are optimized to balance proactive switching benefits against signaling overhead. The CU processes the indication and initiates data path switching based on the received parameters, achieving efficient resource utilization.
3Loss of information
If data path switching is delayed until after cell switch confirmation, then signaling overhead is minimized, but service continuity is affected
Solution Approach 1:
The CU establishes the second data path in advance upon receiving the indication message from the source DU, before the UE completes its cell switch. This ensures service continuity by having the target data path ready for immediate activation, maintaining reliable connectivity throughout the handover process.
Data Source
AI summary
Certain aspects of the present disclosure provide a method of wireless communication at a first distributed unit (DU), generally including detecting a condition related to a cell switch of a user equipment (UE) that supports dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling, wherein the condition is detected while a first data path between a centralized unit (CU) and the UE via the first DU is active and transmitting, based on detection of the condition, an indication to trigger the CU to begin forwarding data to the UE via a second data path involving a second DU involved in the cell switch.