Access Terminal Bearer Context Synchronization
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Solution Overview
Problem
In wireless communication networks, there is a challenge in synchronizing bearer context between an access terminal and the network when the terminal moves out of network coverage, leading to incomplete resource release and inefficient resource management.
Innovation Solution
The access terminal locally deactivates the bearer context when communication is lost and synchronizes it with the network upon reconnection by sending a message, such as a tracking area update message, to ensure proper resource release and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access terminal waits for network confirmation before deactivating bearer context, then synchronization reliability is improved, but resource release time is delayed and network coverage availability is reduced
Solution Approach 1:
The access terminal performs preliminary local deactivation of the bearer context before network confirmation is received. When the terminal determines that resources are no longer needed (e.g., call ended, out of coverage), it immediately deactivates the bearer context locally and sends a resource release request to the network, rather than waiting for network confirmation before proceeding with deactivation.
2Productivity
If the access terminal performs local deactivation without network confirmation, then resource release speed is improved, but synchronization reliability deteriorates when terminal is out of coverage
Solution Approach 1:
The system implements feedback mechanisms where the access terminal sends resource release requests to the network and awaits confirmation messages. The terminal maintains state information about whether a resource release request was sent and whether confirmation was received, allowing it to determine when local deactivation is appropriate. The network also provides feedback through confirmation messages that inform the terminal of the deactivation status.
3Reliability
If the network maintains long timers for bearer context validation, then synchronization reliability is improved, but resource management efficiency deteriorates
Solution Approach 1:
The access terminal performs preliminary local deactivation of the bearer context before the network's timer expires. By proactively deactivating the bearer context locally and sending resource release requests, the terminal eliminates the need for the network to maintain long timers for validation, as the terminal has already taken the deactivation action and is seeking network confirmation.
4Reliability
If the access terminal sends resource release requests frequently, then synchronization reliability is improved, but network signaling overhead increases
Solution Approach 1:
The access terminal applies partial action by sending resource release requests only when specific conditions are met (resources no longer needed, out of coverage, call ended), rather than continuously or excessively. The terminal also applies excessive action in the sense that it sends the request promptly when conditions are met, ensuring reliable synchronization without unnecessary delays, while the network filters and processes only the necessary confirmations.
Data Source
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AI summary
Bearer context maintained by an access terminal is synchronized with a network so that a change in the status of the bearer context may be reflected at the network. For example, if an access terminal determines that a resource previously requested by the access terminal is no longer needed, the access terminal may deactivate the bearer context locally in a case where the access terminal is unable to communicate with the network. In such a case, the access terminal may synchronize its bearer context with the network once the access terminal reestablishes communication with the network. For example, the access terminal may send a message to the network indicating that the access terminal has deactivated the bearer context.