L1 Filter Accuracy Reporting for Reliable Handover Decisions
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Solution Overview
Problem
In cellular communication systems, there is a tradeoff between measurement accuracy and delay due to the use of L1 and L3 filters, leading to potential mobility failures and handover issues such as radio link failures, handover failures, and ping-pong effects, as the network is unaware of the actual L1 filter implementation accuracy and delay.
Innovation Solution
A method and apparatus for a user equipment (UE) to report measurement accuracy of the L1 filter to the network, enabling the network to coordinate and reconfigure the L3 filter based on the L1 filter's accuracy and delay characteristics, using measurement accuracy classes (MA classes) to optimize filter configurations and prevent erroneous handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If L1 and L3 filters are used to improve measurement accuracy, then measurement accuracy is improved, but measurement delay increases
Solution Approach 1:
The patent implements feedback by having the UE report L1 filter measurement accuracy information to the network. This feedback enables the network to understand the actual measurement accuracy and delay characteristics, allowing for dynamic coordination and reconfiguration of the L3 filter to optimize the accuracy-delay tradeoff.
Solution Approach 2:
The patent introduces dynamic reconfiguration capability where the L3 filter configuration can be adjusted based on reported L1 filter accuracy information. The network can autonomously update L3 filter parameters in response to changing L1 filter conditions, making the system adaptive rather than static.
2Measurement precision
If L3 filter configuration is optimized for accuracy, then measurement accuracy is improved, but handover failures increase due to excessive delay
Solution Approach 1:
By reporting L1 filter accuracy information to the network, the system enables feedback-driven L3 filter reconfiguration. This allows the network to balance accuracy and timing, preventing handover failures caused by excessively delayed measurements while maintaining adequate measurement accuracy.
Solution Approach 2:
The patent changes the L3 filter configuration parameters based on reported L1 filter accuracy information. The network can adjust L3 filter coefficients and other parameters to achieve optimal handover performance, preventing both accuracy loss and handover failures.
3Measurement precision
If L1 filter accuracy is increased, then measurement accuracy is improved, but network coordination complexity increases
Solution Approach 1:
The feedback mechanism of reporting L1 filter accuracy information provides the network with essential data without requiring complex coordination protocols. This simple feedback approach enables the network to understand UE measurement capabilities and adjust L3 filter configuration accordingly, avoiding excessive coordination complexity.
Solution Approach 2:
The UE autonomously measures and reports its own L1 filter accuracy information, and the network autonomously decides on L3 filter reconfiguration. This self-service approach reduces the need for complex interactive coordination between network and UE, simplifying the overall system while maintaining high measurement accuracy.
4Speed
If autonomous L3 filter update is enabled, then response time is improved, but filter configuration accuracy may deteriorate
Solution Approach 1:
The UE reports L1 filter accuracy information in advance, enabling the network to perform preliminary assessment and planning for L3 filter reconfiguration. This preliminary action allows the network to prepare accurate reconfiguration commands that maintain measurement precision while achieving fast response when handover conditions are met.
Solution Approach 2:
The autonomous L3 filter update is driven by feedback from L1 filter accuracy reporting. The network uses this feedback to make informed decisions about when and how to update the L3 filter, ensuring that accuracy is maintained while achieving rapid response to changing conditions.
Data Source
AI summary
There is provided an apparatus comprising at least one processor, and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least: receiving, from a network node, configuration for reporting information on measurement accuracy of a L1 filter in use; transmitting, to the network node, information on measurement accuracy of the L1 filter having an initial measurement accuracy.