Radio Bearer Mapping for Intersystem Handover Signaling
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Solution Overview
Problem
Current systems face challenges in maintaining session continuity and efficiently handling intersystem changes between 2G/3G and SAE/LTE networks, particularly due to differences in architecture, node configurations, and bearer concepts, leading to increased signaling requirements and difficulties in converting between network-controlled and mobile-terminal-initiated bearers.
Innovation Solution
A packet data core network node with mapping functions that facilitate seamless intersystem changes by mapping between different radio bearers, reducing signaling overhead and ensuring quality of service continuity, regardless of whether the change is network-initiated or mobile-terminal-initiated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional intersystem change procedures are used between 2G/3G and SAE/LTE networks, then session continuity can be maintained, but signaling overhead increases significantly and conversion between different bearer concepts becomes complex
Solution Approach 1:
The patent introduces a mapping function as an intermediary mechanism that operates at the packet data core network node to translate between different bearer concepts (2G/3G PDP contexts and SAE/LTE bearers). This mapping function acts as a mediator that automatically converts bearer parameters during intersystem changes, eliminating the need for complex direct conversion procedures and reducing signaling overhead while maintaining session continuity.
Solution Approach 2:
The patent applies parameter changes by transforming bearer parameters from one network type to another through the mapping function. When a mobile terminal performs an intersystem change, the mapping function modifies the bearer parameters (such as QoS parameters, bearer identifiers, and traffic flow templates) to match the target network's bearer concept, enabling seamless transition without requiring extensive signaling for parameter negotiation.
2Adaptability or versatility
If optimized signaling is provided to establish bearers at every system change, then bearer conversion between 2G/3G and SAE/LTE can be achieved, but signaling overhead increases and processing time increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring the mapping function with bearer conversion rules and parameters before the actual handover occurs. The mapping function is pre-established at the packet data core network node with the necessary translation tables and conversion logic, so that when an intersystem change is needed, the conversion can be performed immediately without requiring time-consuming setup procedures or extensive real-time signaling.
3Productivity
If network-controlled bearers are used in SAE/LTE and mobile-terminal-initiated bearers in 2G/3G, then each network can optimize its bearer setup, but converting between these different bearer initiation modes during intersystem changes becomes difficult
Solution Approach 1:
The mapping function serves as an intermediary that handles the conversion between network-controlled and mobile-terminal-initiated bearer setups. It translates the bearer initiation approach from one network type to another, allowing SAE/LTE network-controlled bearers to be converted to 2G/3G mobile-terminal-initiated bearers (and vice versa) automatically during intersystem changes, eliminating the need for complex manual conversion procedures.
Data Source
AI summary
A packet data core network node and methods supporting packet data communication are disclosed. In one embodiment, a packet date core network node in a first core network comprises a first communication mechanism for control plane handling and mobility management, a second communication mechanism for user plane management and a mechanism for communication with a dual mode mobile terminal over a first radio network. The packet data core network node comprises or communicates with a mapping function for mapping between first radio bearers used in the first core and radio networks and second radio bearers of a type different from the type of the first radio bearers and used in a second core radio network at handover of a dual mode mobile terminal from the first core network to the second core network or vice versa. Another embodiment is a dual mode mobile terminal including such mapping function.