UE Connection Failure Logging Across Multiple NR Cells
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Solution Overview
Problem
There is a need for a method and apparatus to efficiently log and report radio resource control (RRC) connection establishment or resume failure information in a NR system.
Innovation Solution
A user equipment (UE) initiates a connection establishment or resume procedure, starts a timer, and upon expiration, identifies cell identity mismatch, stores connection failure report information in a list of UE variables, and transmits a message including these variables to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If connection failure report information is stored in a single UE variable, then the storage structure is simple, but multiple connection failure reports from different cells cannot be distinguished
Solution Approach 1:
The patent divides the storage structure into multiple UE variables (first UE variable, second UE variable, third UE variable) to store different connection failure report information from different cells. This segmentation allows the system to maintain simple individual variable structures while enabling distinction between multiple cells through separate variable instances.
2Loss of time
If a timer is started for each connection establishment procedure, then connection failure timing is accurately tracked, but system complexity increases
Solution Approach 1:
The patent employs a single timer (T300) that serves multiple connection establishment procedures simultaneously. This universal timer approach allows accurate timing tracking across different cells and procedures while avoiding the complexity of managing multiple separate timers, as the timer can be restarted or reconfigured for each new connection attempt.
3Speed
If connection failure information is reported immediately upon timer expiration, then reporting speed is high, but information accuracy may be compromised due to cell identity changes
Solution Approach 1:
The patent performs preliminary comparison of cell identities between the current cell and the cell associated with stored connection failure report information before reporting. This preliminary action ensures that only relevant and accurate information is reported, maintaining measurement precision while enabling relatively quick reporting when the cell identity matches.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method of a UE in a wireless communication system is provided. The method includes initiating a connection establishment procedure or a connection resume procedure on a cell and starting a timer corresponding to the connection establishment procedure or the connection resume procedure, identifying that the timer expires, in case that a cell identity of the cell is not equal to a cell identity stored in a UE variable for a connection failure report, storing first connection failure report information stored in the UE variable in a new entry of a list of UE variables for multiple connection failure reports, clearing the UE variable and storing second connection failure report information for the cell in the UE variable, and transmitting a message including the UE variable and the list of UE variables.