Multicast Session Start Signaling for 5G Resource Reservation

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Solution Overview

Problem

Existing 5G wireless communication systems face challenges in efficiently managing multicast-broadcast services, particularly in handling multicast session start requests and resource reservations, especially when sessions are scheduled in advance or require low power consumption.

Innovation Solution

Implementing a system where an Application Function (AF) indicates a separate session start request for multicast sessions, allowing the network to prepare resources in advance and manage UE power states based on session activity, using database storage and timer supervision to optimize resource allocation and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the network reserves resources for multicast sessions in advance, then resource allocation efficiency is improved, but network complexity and overhead increase

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidnetwork complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements preliminary resource reservation by introducing a session information indication message that allows the network to prepare resources in advance for scheduled multicast sessions. The AF provides session information including start time, stop time, and session ID to the network, enabling proactive resource allocation before the actual session begins, thus improving resource allocation efficiency while managing complexity through structured information exchange.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If UE remains in connected state to receive multicast sessions, then service continuity is improved, but power consumption increases

Engineering Contradiction:

Improveservice continuityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic state management by allowing UE to transition between connected and inactive states based on session timing information. The network provides session start/stop times to UE, enabling devices to dynamically switch to low-power inactive state during non-session periods and automatically return to connected state when sessions are active, thus reducing power consumption while maintaining service continuity.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If separate session start request is implemented, then session management precision is improved, but signaling overhead increases

Engineering Contradiction:

Improvesession management precisionVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent segments session management into distinct phases: session information indication (providing start/stop times and session ID), session activation confirmation, and resource reservation requests. This segmentation allows precise control over session lifecycle events while organizing signaling into structured, manageable message exchanges that reduce overall overhead compared to uncoordinated signaling.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12506631B2Separate session start request indication

Publication Date: 2025.12.23 NOKIA TECHNOLOGIES OY

AI summary

Systems, methods, and/or apparatuses are provided relating to multicast service session information. Related procedures are for example provided including transmitting multicast service session information to a core network node, wherein the multicast service session information comprises an indication of whether a separate session start request will be later provided for the multicast service session and/or a start time and stop time for the multicast service session.