Home Identity Location Register for Handover Signaling Load Reduction
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Solution Overview
Problem
The existing communication systems face challenges in managing handover processes due to large correspondent node lists at access nodes, leading to high memory and CPU usage, as well as increased signaling processing loads during handovers, especially when users are centralized, causing network planning difficulties.
Innovation Solution
A method is introduced where a home identity location register (ILR) is used to manage and update location identifiers for terminals, reducing the need for access nodes to store and transfer extensive correspondent node lists by reporting mapping information in real-time or batches, and notifying access nodes of new location identifiers, thereby optimizing signaling processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access node stores the correspondent node list for all user terminals, then the location identifier update can be notified to all correspondent nodes, but the memory resources and CPU processing performance of the access node are heavily consumed
Solution Approach 1:
The patent extracts the correspondent node list storage function from the access node and relocates it to the home identity location register. The access node only stores the user terminal's location identifier mapping, while the correspondent node list is maintained centrally at the home identity location register, reducing the access node's memory and processing burden.
Solution Approach 2:
The home identity location register acts as an intermediary between the access node and correspondent nodes. Instead of the access node directly storing and managing correspondent node lists, the home identity location register mediates the information storage and notification process, centralizing the management of correspondent node information.
2Reliability
If the access node transfers the correspondent node list to the handover-in access node during handover, then the correspondent nodes can be notified of the new mapping information, but the communication signaling load increases dramatically
Solution Approach 1:
The patent extracts the correspondent node list from the access node's local storage and relocates it to the home identity location register. During handover, only the user terminal's location identifier mapping is transferred between access nodes, while the correspondent node list remains centrally stored, eliminating the need to transfer large amounts of correspondent node information during handover.
Solution Approach 2:
The home identity location register pre-stores the correspondent node list before handover occurs. When handover happens, the system only needs to notify the home identity location register of the new location identifier, and it automatically handles the correspondent node notifications, avoiding the need to transfer the entire correspondent node list during handover.
3Reliability
If the access node notifies each correspondent node access node one by one of the new mapping information, then all correspondent nodes receive the update, but the signaling processing ability of the access node is heavily occupied
Solution Approach 1:
The home identity location register serves as an intermediary that centralizes the notification process. Instead of the access node notifying each correspondent node access node individually, the home identity location register receives the new location identifier and handles the notifications to all relevant correspondent nodes, distributing the signaling processing load away from the access node.
Data Source
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AI summary
An information notification method is applied in a network with separated identity identifier and location to notify the correspondent node to update the location identifier of the terminal. The method includes: a terminal establishes a communication with a correspondent node, a first access node which the terminal accesses reports to a home identity location register (ILR.) of the terminal the mapping information about the identity identifier and location identifier of the correspondent node of the terminal, and the ILR stores the mapping information about the correspondent node of the terminal; and after having acquired a new location identifier of the terminal, the ILR sends a notification of updating the location identifier of the terminal to one or more access nodes which the correspondent node accesses according to the stored mapping information about the correspondent node of the terminal, carrying the identity identifier and new location identifier of the terminal. The signaling processing load of the access node during a handover is reduced effectively.