RIM Flow Synchronization via Sequence Number Checking
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Solution Overview
Problem
Conventional RIM protocols in LTE-enhanced universal terrestrial radio access networks fail to detect abnormalities in serving nodes, leading to system information inconsistencies and reduced success rates and performance in inter-system handovers and reorientations.
Innovation Solution
A method and controlling node that send request messages with a report interval for system information from serving nodes, check sequence numbers to determine synchronization, and reinitiate the RIM flow when asynchronous, updating the report interval and informing the serving node to stop and restart reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional RIM protocol is used for information interaction between RAN nodes, then the system information can be transmitted between nodes, but the controlling node cannot detect serving node abnormalities, leading to invalid or wrong system information
Solution Approach 1:
The patent implements a feedback mechanism where the serving node periodically reports system information to the controlling node, and the controlling node sends acknowledgment messages. When the serving node is reset or experiences link abnormalities, the lack of feedback or abnormal feedback allows the controlling node to detect the abnormality and invalidate cached system information, thus maintaining information reliability without complex detection mechanisms
Solution Approach 2:
The patent applies preliminary action by having the controlling node pre-validate system information through sequence number checking before using it for handover decisions. The node also pre-establishes failure detection mechanisms that trigger automatic invalidation of cached information when abnormalities are detected, preventing the use of outdated information
2Productivity
If the controlling node caches system information from the serving node, then handover performance is improved, but the cached information becomes invalid when the serving node is reset or link abnormalities occur
Solution Approach 1:
The controlling node uses feedback from periodic system information reports and acknowledgment messages to validate cached information. When feedback indicates the serving node is unresponsive or sending abnormal data, the controlling node invalidates the cache, maintaining reliability while allowing efficient handovers during normal operation
Solution Approach 2:
The patent changes the validation parameter from static caching to dynamic validation using sequence numbers and timing checks. The controlling node monitors parameters such as report intervals and sequence number continuity, invalidating cached information when these parameters indicate abnormalities, thus balancing productivity and reliability
3Measurement precision
If the controlling node sends frequent requests for system information, then detection of serving node abnormalities is improved, but network overhead and processing load increase
Solution Approach 1:
The patent implements periodic action by having the controlling node send system information requests at regular, predetermined intervals rather than continuously or on-demand. This periodic polling provides sufficient abnormality detection accuracy while minimizing network overhead and processing load compared to more frequent sampling
Solution Approach 2:
The patent applies partial action by using a moderate request frequency that provides adequate detection capability without excessive network overhead. The request interval is optimized to be frequent enough to detect abnormalities promptly but not so frequent as to create excessive processing load or network traffic
Data Source
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AI summary
The present invention provides a method and a controlling node for processing message between radio access network nodes. The method includes that: a controlling node sending a request message for multiple reporting system information to a serving node, wherein a report interval is carried in the request message; the controlling node receiving the system information reported by the serving node according to the request message, wherein the system information is reported when the system information of a system where the serving node is located changes or the report interval is reached; the controlling node checking the receiving sequence numbers of the system information reported multiple times according to the report interval, and judging whether the RIM flow of the controlling node is synchronous with a RIM flow of the serving node or not according to the receiving sequence numbers; and the controlling node reinitiating a RIM flow when the RIM flow of the controlling node is asynchronous with the RIM flow of the serving node. By the present invention, the problem that the controlling sensor cannot sense an abnormity of the serving node when the serving node is abnormal in a RIM flow is solved.