Small Cell Architecture Local Offload Bearer Switching
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Solution Overview
Problem
Current small cell architectures face challenges in efficiently managing and switching packet data network connections between macro evolved NodeB (MeNB) and small cell evolved NodeB (SeNB) for local IP access and selected IP traffic offload, particularly in ensuring seamless communication and resource allocation.
Innovation Solution
The implementation of a system that allows for the use of a 'Connectivity Type' IE in ACTIVATE DEFAULT BEARER CONTEXT REQUEST messages to indicate Local IP Access (LIPA) or Selected IP Traffic Offload (SIPTO) connections, enabling the MeNB to manage bearer switching and IP address allocation between MeNB and SeNB, with the SeNB determining and assigning IP addresses for local gateways and communicating with the MeNB for dual connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bearers are switched between MeNB and SeNB for LIPA/SIPTO connections, then network flexibility and resource utilization are improved, but connection stability and seamless communication are compromised
Solution Approach 1:
The patent applies preliminary action by pre-configuring bearer switching capabilities and maintaining context information in both MeNB and SeNB before actual switching occurs. The MeNB prepares handover commands and maintains bearer context in advance, ensuring that when switching between MeNB and SeNB for LIPA/SIPTO connections, the transition is seamless and connection stability is preserved while achieving network flexibility
Solution Approach 2:
The patent uses the MeNB as an intermediary between the UE and SeNB for LIPA/SIPTO bearer management. The MeNB maintains the S1 connection to the core network and coordinates bearer switching with the SeNB, acting as a mediator that ensures continuous connectivity while enabling flexible resource allocation between macro and small cells
2Productivity
If SeNB determines and assigns IP addresses for local gateways, then IP address allocation efficiency is improved, but coordination complexity with MeNB increases
Solution Approach 1:
The patent applies segmentation by dividing IP address management responsibilities: the SeNB handles local IP address assignment for LIPA/SIPTO gateways within its coverage area, while the MeNB manages overall bearer context and core network connectivity. This segmentation enables efficient local IP allocation at the SeNB while the MeNB maintains coordination through standardized X2 interface signaling for bearer switching
Solution Approach 2:
The patent implements feedback mechanisms where the SeNB reports IP address allocation status and bearer configuration to the MeNB through X2 interface signaling. The MeNB provides feedback on bearer context and switching decisions, enabling coordinated IP address management that balances local efficiency with overall system coordination
Data Source
AI summary
Small cell enhancement for dual connectivity operation and/or the impact of such enhancement for the support of the example LIPA/SIPTO architecture may be useful. The L-GW shown could be a collocated L-GW (e.g., with S-GW not shown) and/or a standalone L-GW with S-GW capabilities. Embodiments recognize the scenario of the SIPTO above RAN and/or SIPTO at local network, perhaps with standalone combined gateway. Embodiments contemplate that it may be useful to provide support of/for LIPA/SIPTO at a local network with a collocated gateway in a dual connectivity mode, among other scenarios. Embodiments also contemplate the usefulness for providing the capability of supporting the dual connectivity operation in multiple scenarios.