Session Binding Retry Control for BSF Failure Recovery
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Solution Overview
Problem
Wireless communication networks face challenges in efficiently and accurately creating session bindings between user devices and Policy Control Functions (PCFs) due to errors on the Binding Support Function (BSF), leading to reduced accuracy and limited usefulness of session bindings for network functions and third parties.
Innovation Solution
Implementing a retry mechanism where a policy controller detects session binding request failures, sets a retry timer, provides network policies, and upon timer expiration, retries the session binding request to the binding data store, ensuring successful association between the policy controller and user device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the BSF creates session bindings between PCFs and user devices, then the accuracy and usefulness of binding data is improved, but errors on the PCF and/or BSF can occur that inhibit successful binding creation
Solution Approach 1:
The patent applies preliminary action by implementing a retry mechanism that attempts to create session bindings multiple times before giving up. The PCF or BSF initiates retry requests with exponential backoff timing, proactively attempting to establish bindings that initially failed, rather than immediately accepting the failure state.
Solution Approach 2:
The patent implements feedback through the retry mechanism where the system monitors binding creation failures and responds by initiating retry attempts. The exponential backoff timing provides feedback-based control, adjusting retry intervals based on previous failure outcomes to optimize successful binding creation while managing system load.
2Measurement precision
If retry requests are continuously sent to the BSF to reattempt session binding creation, then the accuracy of session bindings is improved, but network resources and system load increase
Solution Approach 1:
The patent applies periodic action through exponential backoff timing in the retry mechanism. Instead of continuous or uniform retry attempts, the system implements periodic retries with increasing intervals between attempts. This reduces network resource consumption by spacing out retry requests while still achieving accurate session binding creation over time.
3Productivity
If the PCF forgoes session binding when error conditions persist, then network operations can continue, but the accuracy of data stored by the BSF is reduced
Solution Approach 1:
The patent applies preliminary action by implementing retry requests before finally forgoing session binding. The system proactively attempts multiple recovery actions with exponential backoff timing before accepting that the binding cannot be created, ensuring that productivity is maintained only after exhaustive retry attempts have failed.
Data Source
AI summary
Various embodiments include a wireless communication network that comprises network circuitry. The network circuitry executes a policy controller, session controller, and binding data store. The policy controller detects a session binding request failure to a binding data store and indicates a retry timer to the session controller that manages a session for a wireless user device. The policy controller provides network policies to the session controller for the session of the wireless user device. The policy controller receives a policy update request from the session controller in response to expiration of the retry timer. The policy controller transfers a session binding request to the binding data store. The binding data store receives the session binding request and stores a session binding that associates the policy controller and the wireless user device.