UE Measurement Report Merging for Handover Delay Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, the handover process to a CSG cell is delayed due to the need for two separate reporting steps by the UE, leading to prolonged communication downtime and potential quality deterioration.
Innovation Solution
The UE transmits system information of a target cell along with its measurement result to the serving cell when a specific condition is met, allowing for rapid handover by minimizing the delay in receiving a handover command message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs two separate reporting steps (first reporting measurement result, then reporting system information) before receiving handover command, then the handover process is more thorough and reliable, but the handover delay time becomes too long and communication quality deteriorates
Solution Approach 1:
The patent combines two separate reporting steps into one unified reporting step. The UE simultaneously reports both the measurement result and the system information of the target cell in a single measurement report message, eliminating the need for sequential reporting. This merging approach maintains the reliability of handover by ensuring both pieces of information are provided, while significantly reducing the handover delay time by eliminating the waiting period between the first and second reporting steps.
Solution Approach 2:
The patent applies preliminary action by having the UE acquire and store the system information of the target cell in advance, before the network requests it. The UE proactively reads and caches the system information during the measurement phase, so that when the measurement report is sent, the system information is already available and can be included immediately. This preliminary acquisition eliminates the delay that would otherwise occur while waiting for the network to request and the UE to fetch the system information.
2Loss of information
If the UE acquires system information from target cell and reports it separately, then the serving cell has complete information for handover decision, but the handover process becomes more complex and takes longer
Solution Approach 1:
The patent merges the transmission of measurement results and system information into a single reporting message. Instead of sending two separate messages (one for measurement result, another for system information), the UE consolidates both types of information into one measurement report message. This approach ensures the serving cell receives complete information for handover decision while simplifying the reporting process and reducing the number of signaling exchanges required.
Data Source
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AI summary
A method for reporting in a wireless system, according to one embodiment, is provided. The method comprises: receiving a measurement setting from a serving cell, wherein the measurement setting comprises a system information report indicator for indicating a system information report of a cell to which a measurement result is reported; deciding whether a report condition is satisfied based on the measurement setting; and transmitting to the serving cell a measurement report message comprising the measurement result of the cell to which the result is reported, which satisfied the report condition. The measurement report message further comprises system information of the cell to which the report is made.