5G LAN Routing Rules for Flexible N6 and N19 Packet Forwarding
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Solution Overview
Problem
The existing 5G mobile communications system local area network (LAN) services face challenges in effectively utilizing the three forwarding manners: local forwarding, N19-based forwarding, and N6-based forwarding within a 5G virtual network group.
Innovation Solution
A routing rule configuration method is implemented by the session management function network element to determine and configure routing rules for data forwarding using any of the local, N19-based, or N6-based forwarding manners based on specific information, such as data routing policies or policy and charging control rules, allowing flexibility and applicability in selecting the appropriate forwarding method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the session management function network element uses conventional routing rule determination based on anchor UPF comparison, then the routing rule can be determined, but only local forwarding or N19-based forwarding can be used, not N6-based forwarding
Solution Approach 1:
The patent changes the parameter used for routing rule determination from anchor UPF comparison to data routing policy configuration. By introducing a new determination parameter (data routing policy) that explicitly indicates N6-based forwarding support, the system enables N6-based forwarding while maintaining the existing determination mechanism, thus achieving versatility without significantly increasing complexity
Solution Approach 2:
The session management function network element is enhanced to support multiple forwarding manners (local forwarding, N19-based forwarding, and N6-based forwarding) through a unified routing rule determination mechanism. The data routing policy parameter allows the same determination process to accommodate different forwarding requirements, making the system multi-functional
2Adaptability or versatility
If multiple forwarding manners are implemented in 5G LAN group, then forwarding flexibility is improved, but the calculation workload of session management function network element increases
Solution Approach 1:
The data routing policy is configured and determined in advance before actual data forwarding occurs. By pre-determining the routing rule based on the data routing policy parameter, the session management function network element avoids complex real-time calculations during data forwarding, thus reducing instantaneous calculation workload while maintaining forwarding flexibility
Solution Approach 2:
By changing the determination parameter to data routing policy, the system simplifies the calculation process. Instead of performing complex anchor UPF comparisons and multiple condition checks, the system directly uses the pre-configured data routing policy parameter, which reduces the calculation workload while supporting multiple forwarding manners
Data Source
AI summary
A routing rule configuration method and a communications apparatus are provided, where after receiving a PDU session establishment request from a first terminal, a session management function network element generates, based on first information including information used to indicate to forward a data packet through an N6 interface, a routing rule used to indicate to send the data packet of a 5G LAN group to which the first terminal belongs to the N6 interface or discard the data packet. The session management function network element can determine a routing rule for an N6-based forwarding manner based on the first information.