RAN Node RLF Timer Session Release Identification
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Solution Overview
Problem
Existing wireless communication networks struggle to accurately distinguish between voice calls that are normally terminated and those that are abnormally released due to communication problems, leading to mistaken identification and prevention of preventive actions.
Innovation Solution
A Radio Access Network (RAN) node is equipped with a processing unit that monitors normal session releases initiated by the Core Network and checks if a Radio Link Failure (RLF) timer has been triggered within a specific time period. If the RLF timer was triggered, the node counts and reports the number of communication sessions that were mistakenly detected as normally released to a network management system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network monitors normal session releases to maintain accurate call termination statistics, then the call drop rate statistics become more reliable, but communication sessions that are abnormally released may be mistakenly identified as normally terminated
Solution Approach 1:
The patent introduces an intermediary mechanism (RLF timer and its status indicator) that acts as a mediator between the normal session release detection and the final call termination classification. This intermediary allows the system to differentiate between truly normal terminations and abnormally released calls that appear normal, thereby resolving the contradiction between measurement precision and reliability
Solution Approach 2:
The system performs preliminary action by checking the RLF timer status before finalizing the call termination classification. By proactively checking whether the RLF timer was triggered within a specific time window before the session release, the system prevents mistaken identification of abnormally released calls as normal terminations, thus maintaining both measurement precision and reliability
2Reliability
If the network identifies and reports mistakenly detected communication sessions to improve call drop rate accuracy, then network optimization can be enhanced, but the device complexity of the RAN node increases
Solution Approach 1:
The patent extracts only the essential information needed for call drop identification (RLF timer trigger status within a specific time window) from the complex session management process. By focusing on this specific indicator rather than analyzing all session parameters, the system improves call drop rate accuracy while minimizing the increase in device complexity
Solution Approach 2:
The system changes parameters by monitoring specific timing parameters (whether RLF timer was triggered within a defined time window before session release) rather than analyzing the entire session lifecycle. This parameter-focused approach enables accurate call drop identification without requiring complex analysis of all session characteristics, thus improving reliability while controlling device complexity
Data Source
AI summary
The disclosure relates a technique that allows one to identify communication sessions which are mistakenly detected as normally terminated from the network perspective. The first time period is used to monitor normal session releases initiated by a core network (CN) in respect of communication sessions for UEs. The second time period is used to check whether a Radio Link Failure (RLF) timer is already triggered at the time instant when the normal session release(s) is(are) detected by the RAN node within the first time period. If the RLF timer is already triggered, the number of the communication session(s) to be normally released based on the normal session release(s) from the CN is counted and reported to a network management system when the first time period expires. In response, the network management system properly optimizes RAN or other network parameters such that a call drop rate is improved.