Default Bearer Selection in LTE Attach Procedures
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Solution Overview
Problem
The current LTE network attach procedure can lead to desynchronization between user equipment (UE) and the network, resulting in failed attach procedures due to the lack of clear identification and prioritization of the default bearer resource during bearer setup, leading to costly and difficult recovery from unsuccessful bearer establishment.
Innovation Solution
A method is introduced where a criterion, such as a flag or predetermined organization of bearer resource identifiers, is used to select and prioritize the default bearer resource during the attach procedure, ensuring its successful establishment and providing a failure response when unsuccessful.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple bearer resources are set up simultaneously during attach procedure without clear identification, then bearer setup complexity is reduced, but reliability of default bearer establishment deteriorates
Solution Approach 1:
The patent uses a flag field (analogous to a visual marker) in the bearer setup request message to clearly identify and mark the default bearer resource among multiple bearer resources. This flag acts as a distinctive marker that allows the access network control node to reliably identify which bearer is the default bearer, resolving the reliability issue while maintaining the ability to handle multiple bearers simultaneously
Solution Approach 2:
The patent introduces a flag field as an intermediary element in the bearer setup request message. This flag serves as a mediator between the network node requesting bearer setup and the access network control node, providing clear identification of the default bearer without requiring complex identification protocols or increasing the overall complexity of the bearer setup process
2Loss of time
If default bearer resource is not prioritized during bearer setup, then processing time is reduced, but attach procedure failure rate increases
Solution Approach 1:
The patent implements preliminary action by having the access network control node identify and prioritize the default bearer resource before completing the bearer setup process. The flag field enables the control node to mark the default bearer in advance, allowing it to allocate resources and establish the default bearer first, ensuring its successful establishment before proceeding with other bearer resources. This preliminary prioritization prevents attach procedure failures while maintaining efficient processing
3Device complexity
If bearer resources are identified without specific criteria, then information exchange is simplified, but desynchronization between UE and network increases
Solution Approach 1:
The patent uses a flag field as a clear visual marker (analogous to color coding) in the bearer setup request message to identify the default bearer resource. This flag provides unambiguous identification that is easily recognized by both the access network control node and the user equipment, ensuring that both parties remain synchronized about which bearer is the default bearer without requiring complex identification protocols or increasing information exchange complexity
Data Source
Figure 1
Figure 2a~3
AI summary
In a wireless communication system comprising a radio access network, said radio access network comprising at least one access network control node capable of setting up radio bearer resources responsive to reception of a request for setting up bearer resources relative to a user equipment of the wireless communication system, a criterion for selecting a bearer resource associated with the attach acceptance message of the user equipment among other bearer resources in said plurality of bearer resources is sent to the access network control node, during the attach procedure of the user equipment to the wireless communication system, in a request for setting up a plurality of bearer resources.