Layer 1 and 2 Triggered Handover for Energy Savings
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing handovers between primary and secondary cells, particularly in terms of energy savings and mobility management, as existing handover procedures do not effectively prioritize energy conservation and mobility optimization.
Innovation Solution
Implementing a layer 1/layer 2 triggered handover mechanism that considers conditional handover requests based on group common downlink control information, allowing wireless devices to assess and prioritize handover requests based on priority values associated with different types of handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional handover procedures are used, then mobility management is maintained, but energy savings are insufficient
Solution Approach 1:
The system performs preliminary actions by configuring conditional handover (CHO) requests in advance with priority values before handover is actually needed. When a layer 1/layer 2 triggered handover occurs, the wireless device can immediately compare priorities and execute the appropriate handover without delay, thus achieving both energy savings and maintaining handover efficiency.
Solution Approach 2:
The patent introduces dynamic priority values that can be assigned to different handover requests (e.g., RRC triggered HO vs. layer 1/2 triggered HO). This dynamic prioritization allows the system to adaptively manage multiple handover requests based on current conditions, enabling energy-efficient decision-making while maintaining responsive mobility management.
2Reliability
If multiple handover requests are handled simultaneously, then mobility management complexity increases, but decision accuracy improves
Solution Approach 1:
The patent changes the parameter of handover request management by introducing priority values associated with each handover request. This parameter change transforms the complex multi-request handling problem into a simpler priority-based selection process, improving decision accuracy while reducing management complexity through systematic prioritization.
3Use of energy by moving object
If layer 1/layer 2 triggered handover is implemented, then energy savings increase, but handover control complexity increases
Solution Approach 1:
The base station acts as an intermediary by pre-configuring conditional handover requests with priority values. This intermediary action simplifies the wireless device's task during actual handover execution, as the device only needs to compare pre-assigned priorities rather than making complex decisions, thus achieving energy savings without significantly increasing device complexity.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A wireless device may communicate with a base station via a primary cell (PCell) and one or more secondary cells. A plurality of types of handovers, such as a layer 1 / layer 2 triggered handover or a conditional handover, may be indicated to the wireless device for switching its PCell. One or more conditions, such as a priority associated with a handover type, may be used to determine which type of handover to perform.