Core Network Node Data Flow Routing Between 3GPP and WLAN
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Solution Overview
Problem
Current wireless communication systems lack an efficient method to manage data flow between 3GPP and WLAN networks based on actual data requirements, leading to inefficient load distribution and potential delays in sensitive applications.
Innovation Solution
A method and system where a wireless device and core network node collaborate to dynamically adjust data flow between 3GPP and WLAN networks by receiving and transmitting notifications and routing rules, allowing data to be routed based on specific access type requirements indicated by RAN assistance parameters and IP filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data flow is managed using RAN assistance parameters with threshold level information on a per PDN basis, then network access selection is standardized, but data routing efficiency deteriorates due to inability to differentiate between different data flows
Solution Approach 1:
The patent segments the data flow management by introducing flow-specific identifiers (5-tuple: source IP, destination IP, source port, destination port, protocol) to differentiate between various data flows within a PDN connection. This allows the system to apply different routing rules to different flows, improving routing efficiency without requiring complete re-architecture of the access selection mechanism
Solution Approach 2:
The patent adds a new dimension to the routing decision process by incorporating flow-level granularity (5-tuple identification) alongside the existing PDN-level management. This dimensional expansion enables differentiated routing policies for different applications and services within the same PDN, resolving the contradiction between efficiency and complexity
2Reliability
If all data traffic is routed through 3GPP based network, then network control and QoS management are maintained, but network load increases causing delays in sensitive applications
Solution Approach 1:
The patent implements dynamic traffic steering by enabling the network to selectively route different data flows through 3GPP or WLAN access based on flow characteristics, service requirements, and network conditions. This dynamic approach allows sensitive applications to utilize 3GPP for QoS guarantees while less critical traffic uses WLAN, reducing overall delay
Solution Approach 2:
The patent extracts specific data flows from the 3GPP network path and redirects them through WLAN access based on their sensitivity requirements. By separating critical and non-critical traffic into different access networks, the system maintains QoS for sensitive applications while offloading less critical traffic to reduce 3GPP network load and delays
3Productivity
If WLAN based network is used for data offloading, then network load on RAN is reduced, but network control and QoS management capability deteriorates
Solution Approach 1:
The patent introduces the core network (specifically the gateway and PCRF) as an intermediary that maintains QoS control and routing decisions for WLAN-offloaded traffic. The core network receives flow identification information, makes routing decisions, and provides routing rules to the wireless device, ensuring QoS management reliability even when traffic traverses WLAN access
Solution Approach 2:
The patent implements feedback mechanisms where the wireless device reports flow characteristics and access conditions to the core network, which then adjusts routing rules accordingly. This feedback loop ensures that QoS requirements are met while utilizing WLAN for load reduction, as the core network can dynamically modify routing decisions based on reported conditions
Data Source
AI summary
Example embodiments presented herein are directed towards a wireless device and core network node, as well as corresponding methods therein, for managing a data flow between a network access type 1 and a network access type 2. According to some examples, access type 1 may be a 3GPP access and access type 2 may be a non-3GPP access. The wireless device is connectable to both the networks of access types 1 and 2.