UE-Controlled Handover via Reverse Link Path Loss Estimation
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Solution Overview
Problem
Current handover mechanisms in LTE systems, particularly UE-controlled handovers, suffer from large service interruption times and potential weak communication channels due to the lack of consideration for the quality of reverse links when switching between eNBs.
Innovation Solution
Implement a method where user equipment (UE) or serving eNB estimates path loss in reverse links with neighboring eNBs, analyzes these values along with forward link measurements to select the best target eNB for handover, and notifies the decision to ensure optimal handover quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UE-controlled handover is used in LTE, then the handover can be initiated by the UE, but the service interruption time becomes large and the communication channel may be weak
Solution Approach 1:
The patent implements feedback mechanisms where the UE measures forward link quality from neighboring eNBs and reports this information to the network. The network uses this feedback to make informed handover decisions, selecting target eNBs with better forward link quality to ensure reliable communication channels after handover.
Solution Approach 2:
The patent performs preliminary measurements of forward link quality from neighboring eNBs before the handover is executed. By measuring and evaluating the forward link conditions in advance, the system can pre-select appropriate target eNBs, avoiding service interruption and ensuring channel quality from the moment of handover.
2Device complexity
If traditional handover mechanism is used, then the handover process is simple, but the service interruption time is large
Solution Approach 1:
The patent performs preliminary measurements of forward link quality from neighboring eNBs and pre-evaluates potential target eNBs before the handover is triggered. This preliminary action allows the handover to be executed immediately when needed, significantly reducing service interruption time while maintaining a relatively simple handover trigger mechanism.
Solution Approach 2:
The patent introduces dynamic measurement and evaluation of forward link quality that continuously updates the state of neighboring eNBs. This dynamic information allows the system to quickly identify suitable target eNBs when handover is needed, reducing the time required for handover decision-making while keeping the overall mechanism adaptable and efficient.
3Speed
If handover decision is made without analyzing reverse link path loss, then the decision process is fast, but the target eNB selection may result in weak communication channels
Solution Approach 1:
The patent performs preliminary measurement and reporting of reverse link path loss from the UE to neighboring eNBs before the handover decision is made. This advance collection of path loss information allows the network to quickly evaluate multiple target eNBs and select the one with the best forward link quality, maintaining fast decision speed while ensuring channel reliability.
Solution Approach 2:
The patent implements feedback loops where the UE reports forward link quality measurements and reverse link path loss information to the network. The network uses this feedback to make informed handover decisions, selecting target eNBs that optimize both forward and reverse link quality, thereby ensuring reliable communication channels without significantly increasing decision time.
Data Source
AI summary
Certain aspects of the present disclosure propose methods for enhanced handover procedures that are controlled by either the user equipment (UE) or the serving evolved node-B (eNB). The methods take into account the qualities of both the reverse and forward communication links between the UE and the neighboring eNBs in selecting a target eNB for handover.