MBMS Cell Reselection with System Information Verification

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communication systems, terminals often reselect cells that do not provide Multicast Broadcast Multimedia Service (MBMS), leading to inefficient service delivery and potential congestion, as they apply high priority to frequencies without verifying the availability of MBMS, which can result in jamming and poor load balancing.

Innovation Solution

A cell reselection method where terminals determine if system information for MBMS is broadcast from neighbor cells, applying highest priority only if MBMS is available, and resetting a prohibit timer when MBMS is provided or the serving cell changes, to prevent unnecessary high-priority frequency selection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminals apply highest priority to frequency for MBMS cell reselection, then terminals can receive MBMS service, but terminals may select cells that do not actually provide MBMS causing congestion

Engineering Contradiction:

ImproveMBMS service reception reliabilityVSAvoidcell congestion and jamming

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The terminal checks system information blocks (SIBs) before applying highest priority to MBMS frequency, performing preliminary verification that the cell actually provides MBMS service. This prevents terminals from selecting cells without MBMS, avoiding congestion while ensuring reliable service reception.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal monitors system information broadcast from cells to verify MBMS availability before reselection. This feedback mechanism ensures terminals only prioritize frequencies where MBMS is actually provided, preventing harmful congestion effects while maintaining service reliability.

Inventive Principle:

Principle #23Feedback

2Reliability

If terminals frequently reselect cells based on MBMS priority, then terminals can maintain MBMS service, but network signaling overhead and terminal power consumption increase

Engineering Contradiction:

ImproveMBMS service continuityVSAvoidterminal power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The terminal checks system information blocks at predetermined intervals rather than continuously monitoring, reducing power consumption while maintaining MBMS service continuity. This periodic verification balances service reliability with energy efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The terminal autonomously manages its own cell reselection by checking system information and applying priority rules without requiring continuous network control signaling, reducing both signaling overhead and terminal power consumption while maintaining service reliability.

Inventive Principle:

Principle #25Self-service

3Productivity

If terminals apply highest priority to MBMS frequency, then MBMS service delivery is improved, but load balancing on network resources deteriorates

Engineering Contradiction:

ImproveMBMS service delivery efficiencyVSAvoidnetwork load balancing

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The terminal applies highest priority to MBMS frequency only in local contexts where system information confirms MBMS availability. This localized priority application improves MBMS service delivery where needed while avoiding disruption to overall network load balancing in areas where MBMS is not provided.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9955399B2Method for reselecting MBMS-based cells in wireless communication systems, and apparatus for supporting same

Publication Date: 2018.04.24 LG ELECTRONICS INC

AI summary

Provided are a method performed by a user equipment in a wireless communication system and a user equipment performing the method. The method determines whether system information for a multicast broadcast multimedia service (MBMS) is a broadcast from a neighboring cell and reselects a cell by applying a highest priority to the frequency of a neighboring cell when the system information for the MBMS is the broadcast.