MAC Header Target Channel Type Field for Multicast Data Discrimination

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Solution Overview

Problem

Current multimedia broadcast/multicast services in UMTS systems face limitations in transmitting multimedia data through downlink shared channels, as they cannot effectively discriminate between multicast and dedicated data, leading to potential communication errors and inefficient resource allocation.

Innovation Solution

Incorporating a target channel type field (TCTF) in the MAC header to identify whether the data being transmitted is part of a common or dedicated logical channel, allowing the terminal to determine the appropriate logical channel for data reception and processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multicast service data is transmitted through a downlink shared channel without a logical channel identifier, then the transmission capacity is improved, but the ability to discriminate between multicast and dedicated data deteriorates

Engineering Contradiction:

Improvetransmission capacityVSAvoiddata discrimination capability

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent segments the data transmission by introducing a logical channel identifier field that divides the shared channel into distinguishable logical channels. This allows multicast and dedicated data to be segmented and identified separately within the same physical downlink shared channel, resolving the contradiction between maintaining high transmission capacity and enabling data discrimination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The logical channel identifier acts as an intermediary element between the physical downlink shared channel and the higher layer protocols. This intermediary field enables the system to maintain the efficiency of shared channel transmission while providing the necessary information for distinguishing between different types of data (multicast vs. dedicated) at the receiving end.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a logical channel identifier is added to multicast data, then the discrimination between multicast and dedicated data is improved, but the device complexity increases

Engineering Contradiction:

Improvedata discrimination accuracyVSAvoidMAC header structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by adding the logical channel identifier only to the MAC header portion of the data structure, rather than modifying the entire data packet. This localized modification provides the necessary discrimination capability while minimizing the increase in overall device complexity, as the identifier is confined to a specific structural element.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes a specific parameter of the MAC header by introducing the logical channel identifier field. This parameter change enables data discrimination without fundamentally altering the overall MAC structure, thereby achieving improved reliability with minimal impact on device complexity. The change is localized to adding a field rather than reconfiguring the entire header structure.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7864722B2Multicast service providing method in mobile communication system

Publication Date: 2011.01.04 LG ELECTRONICS INC

AI summary

A multimedia service data transmitting method is disclosed. A logical channel indicator is added in service data mapped to a shared channel so that a terminal can discriminate a type of the service data transmitted through the shared channel. The logical channel indicator is a target channel type field (TCTF) and included in a header of the service data (MAC protocol unit).