MBMS DCI Single Bit Emergency Notification Bandwidth

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Solution Overview

Problem

The deployment of Multimedia Broadcast Multicast Service (MBMS) is limited by the bandwidth constraints of the DCI format 1-C, which restricts the use of emergency notifications such as ETWS and CMAS, requiring additional bandwidth when separate bits are used for SI change notification and ETWS/CMAS notifications.

Innovation Solution

A method where a single bit is used to indicate ETWS and/or CMAS change, allowing the user equipment to behave as if both notifications are received, thereby avoiding bandwidth limitations and enabling deployment on 15 PRB bandwidth that supports SI change notification and both ETWS and CMAS notifications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate bits are used for SI change notification and ETWS/CMAS notifications, then notification reliability is improved, but bandwidth consumption increases requiring 25 PRB or wider bandwidth

Engineering Contradiction:

Improvenotification reliabilityVSAvoidbandwidth consumption

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent merges the indication of multiple emergency notifications (ETWS and CMAS) into a single bit in the DCI format 1-C. When this single bit is set to indicate an emergency notification, the user equipment interprets it as indicating both ETWS and CMAS notifications simultaneously, thereby reducing bandwidth consumption while maintaining notification reliability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single bit in DCI format 1-C serves multiple functions by indicating both ETWS and CMAS emergency notifications. This multi-functional approach allows the same bit to trigger multiple notification types, reducing the overall bandwidth requirement while ensuring comprehensive emergency alert delivery

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If DCI format 1-C bandwidth limitations are adhered to, then spectral efficiency is improved, but emergency notification capability is restricted

Engineering Contradiction:

Improvespectral efficiencyVSAvoidemergency notification capability

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent combines multiple emergency notification indications into a single bit within DCI format 1-C, allowing the system to maintain adherence to bandwidth limitations while preserving full emergency notification capability. This merging enables spectral efficiency to be improved without sacrificing adaptability for emergency alerts

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11570585B2Methods, user equipment and radio network node for multimedia broadcast multicast service

Publication Date: 2023.01.31 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method and a user equipment as well as a method and a radio network node for multimedia broadcast service are disclosed. The radio network node sends, on a physical downlink control channel of the carrier, downlink control information using a multicast network identifier. The downlink control information includes a bit indicating whether or not at least two emergency notifications are broadcast on the carrier, and a notification relating to a change of a multicast channel of the carrier. The user equipment receives, on a physical downlink control channel of the carrier, downlink control information using a multicast network identifier. The user equipment behaves as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the user equipment, when the information satisfies a condition.