Multicast Data Transmission Mode Adaptation in Wireless Networks

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Solution Overview

Problem

Current wireless mobile communication systems face limitations in power-saving efficiency and resource utilization when transmitting multicast data, particularly due to the need for all terminals to remain active for IGMP queries and the inefficiency in handling terminal movements between networks.

Innovation Solution

A method that dynamically adjusts the multicast data transmission and reception mode based on the number of terminals joined, using a point-to-point or point-to-multipoint wireless bearer, and includes feedback mechanisms and group table management to optimize resource usage and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all terminals remain active to receive IGMP queries, then multicast service reliability is improved, but power consumption increases

Engineering Contradiction:

Improvemulticast service reliabilityVSAvoidterminal power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the terminal's operational state changeable between active and sleep modes. Terminals dynamically switch states based on whether they need to receive IGMP queries, allowing the system to adapt power consumption levels while maintaining multicast service reliability when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements periodic action through scheduled wake-up periods where terminals periodically activate to receive IGMP queries from the access point, then return to sleep mode. This periodic activation pattern reduces overall power consumption while ensuring terminals remain available to join multicast groups when queries are transmitted.

Inventive Principle:

Principle #19Periodic action

2Productivity

If multicast data is transmitted using point-to-multipoint bearer, then resource utilization is improved, but adaptability to different terminal counts decreases

Engineering Contradiction:

Improvewireless resource utilizationVSAvoidadaptability to terminal count

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the bearer type changeable based on the number of joined terminals. The system dynamically selects between point-to-point and point-to-multipoint bearers, allowing resource utilization to be optimized for large groups while maintaining adaptability for small groups through flexible bearer type selection.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying the bearer type parameter according to the number of terminals. When the terminal count exceeds a threshold, the system changes from point-to-point to point-to-multipoint bearer, optimizing resource utilization. When the count is low, it reverts to point-to-point for better adaptability and feedback capability.

Inventive Principle:

Principle #35Parameter changes

3Loss of information

If point-to-point bearer is used for multicast transmission, then feedback capability is improved, but resource utilization efficiency decreases

Engineering Contradiction:

Improvefeedback information capabilityVSAvoidwireless resource utilization efficiency

Core Design Contradiction:

Loss of informationVSProductivity

Solution Approach 1:

The patent implements parameter changes by dynamically adjusting the bearer type parameter based on terminal count. Point-to-point bearer is used when few terminals are joined to maintain feedback capability, while point-to-multipoint is used when many terminals are joined to improve resource utilization efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality by having different bearer types used in different situations based on terminal count. The system selects the appropriate bearer quality (point-to-point or point-to-multipoint) locally adapted to the current number of joined terminals, optimizing both feedback capability and resource utilization for each scenario.

Inventive Principle:

Principle #3Local quality

4Reliability

If multicast data is continuously transmitted to all APs, then service coverage is improved, but wireless resource waste increases

Engineering Contradiction:

Improveservice coverageVSAvoidwireless resource waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies taking out by extracting and removing unnecessary multicast data transmissions. The access point determines whether to forward multicast data based on the number of joined terminals, extracting only the necessary transmissions needed to provide service coverage while eliminating wasteful transmissions to APs without joined terminals.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8059572B2Method of transmitting and receiving multicast data

Publication Date: 2011.11.15 LG ELECTRONICS INC

AI summary

The present invention relates to a wireless mobile communication system, and more particularly, to a method of transmitting data to mobile terminals in the wireless mobile communication system capable of transmitting multicast data.In order to solve the aforementioned problems in the prior art, a method of transmitting data to mobile terminals in a mobile terminal communicating with a network through which multicast data are transmitted. The method of the present invention comprises the steps of transmitting a requesting frame to the network for requesting the multicast data when the start of a multicast service is recognized through an upper layer of the mobile terminal; receiving a response frame from the network in response to the request frame; and receiving the multicast data from the network.