AMF-Mediated N2 MBS Session Setup for 5G Broadcast Services

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Solution Overview

Problem

Existing wireless communication systems lack an efficient method for establishing Multimedia Broadcast Service (MBS) sessions, which are crucial for providing multimedia services in 5G networks.

Innovation Solution

The implementation of an Access and Mobility Management Function (AMF) node that processes N2 Multimedia Broadcast Service (MBS) Protocol Data Unit (PDU) session setup requests and responses, facilitating the establishment of MBS sessions through interactions with Session Management Function (SMF) nodes and base stations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing wireless communication systems are used without MBS session establishment, then system simplicity is maintained, but MBS service provisioning capability is lacking

Engineering Contradiction:

ImproveMBS service provisioning capabilityVSAvoidsession establishment mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The MBS session establishment process is segmented into distinct phases: N2 session setup request from SMF to AMF, forwarding to base station, receiving response, and transmitting back. This segmentation allows each network element to handle specific tasks independently, enabling MBS service capability without requiring complete system redesign.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The AMF node acts as an intermediary between the SMF and the base station during MBS session establishment. It receives N2 MBS PDU session setup requests from the SMF, forwards them to the base station, and relays responses back, thereby enabling MBS service provisioning without direct complex interactions between SMF and base station.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If MBS session establishment procedures are implemented, then service provisioning efficiency is improved, but signaling overhead increases

Engineering Contradiction:

Improveservice provisioning efficiencyVSAvoidsignaling message quantity

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The N2 interface and existing session management mechanisms are extended to support MBS services in addition to their traditional unicast functions. The same N2 MBS PDU session setup request and response messages are used for both unicast and broadcast/multicast service establishment, reducing the need for separate dedicated signaling procedures and minimizing additional signaling overhead.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12556887B2Apparatus and method for establishing MBS service session for MBS service provision in wireless communication system

Publication Date: 2026.02.17 SAMSUNG ELECTRONICS CO LTD

AI summary

The disclosure relates to a 5th Generation (5G) or pre-5G communication system for supporting a higher data transfer rate than a 4th generation (4G) communication system such as Long Term Evolution (LTE). According to various embodiments of the disclosure, a method for operating an Access and Mobility Management Function (AMF) node in a wireless communication system is provided. The method includes receiving an N2 Multimedia Broadcast Service (MBS) Protocol Data Unit (PDU) session setup request message for establishing an MBS session from a Session Management Function (SMF) node, transmitting the N2 MBS PDU session setup request message to a base station, receiving an N2 MBS PDU session setup response message from the base station, and transmitting the N2 MBS PDU session setup response message to the SMF node.