Selective Bearer Establishment in E-UTRAN EPS Networks
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Solution Overview
Problem
In E-UTRA and EPS networks, existing methods struggle with selective bearer setup, where multiple bearers are requested simultaneously, leading to failures in initialization due to admission control and resource availability, resulting in the entire bearer setup request failing, rather than allowing selective success and failure indication for individual bearers.
Innovation Solution
The approach involves transmitting a bearer setup request with separate Non-Access Stratum (NAS) packet data units (PDUs) for each bearer, allowing the access point to successfully initialize and indicate failure only for specific bearers, while providing NAS messages for successfully established bearers to the mobile device for further setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple bearers are requested simultaneously in a single bearer setup request, then the network can establish multiple bearers at once, but the entire request fails if any single bearer cannot be initialized due to admission control or resource availability
Solution Approach 1:
The patent segments the bearer setup process by assigning a separate NAS PDU to each bearer request within a single bearer setup request message. This segmentation allows the network to evaluate and initialize each bearer independently, so that failure of one bearer does not cause failure of the entire request. The core network receives multiple individual bearer outcomes (success or failure) rather than a single all-or-nothing result, thereby maintaining high productivity while improving reliability through selective bearer establishment.
2Reliability
If the base station indicates failure for the entire bearer setup request when one bearer cannot be initialized, then the network maintains strict admission control, but resource utilization decreases because successfully initializable bearers are also rejected
Solution Approach 1:
By segmenting the bearer setup into individual NAS PDUs for each bearer, the patent enables the base station to apply admission control strictly to each bearer independently while allowing other bearers to be established. This segmentation prevents the 'contagion effect' where one failed bearer causes rejection of all bearers, thereby improving resource utilization efficiency without compromising admission control reliability.
Solution Approach 2:
The patent implements partial action by allowing the bearer setup request to proceed with establishing as many bearers as possible rather than requiring all or nothing. When some bearers meet admission control criteria and others do not, the system establishes the qualifying bearers partially, rather than rejecting the entire request. This approach optimizes resource utilization by capturing available capacity while maintaining strict admission control for individual bearers.
3Adaptability or versatility
If separate NAS PDUs are provided for each bearer, then selective bearer establishment is enabled, but the complexity of processing and managing multiple NAS messages increases
Solution Approach 1:
The patent uses segmentation by providing separate NAS PDUs for each bearer, which enables selective bearer establishment. While this increases adaptability, the patent manages the resulting complexity through structured message formatting and systematic processing procedures at the base station and mobile device, organizing the multiple NAS messages in a manageable manner.
Solution Approach 2:
The patent applies universality by using a standardized bearer setup request message structure that can accommodate multiple bearers through repeated NAS PDU elements. This universal format allows the same message type to handle both single and multiple bearer scenarios, reducing the need for specialized processing logic for different message types and thereby mitigating complexity increases.
Data Source
AI summary
Systems and methodologies are described that facilitate selectively and simultaneously establishing multiple bearers in wireless communication networks. A core network entity in a wireless network can transmit a bearer establishment request to an access point comprising a list of bearers to establish with a related mobile device. The bearer establishment request comprising list of bearers includes separate non-access stratum (NAS) messages corresponding to each bearer in the list. The separate NAS messages can be linked to each bearer entry in the list. The access point can receive the list and attempt to initialize one or more radio bearers in the list. Since the NAS messages individually correspond to a given bearer, the access point can forward NAS messages to the mobile device only for bearers that are successfully initialized allowing selective establishment thereof. In addition, the access point can provide initialization status for the individual bearers to the core network.