Multicast Inactive Reception Negotiation to Balance Capacity and Reliability

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Solution Overview

Problem

The inactive/idle reception of multicast services in 5G networks leads to increased transmission errors due to the lack of feedback from user equipment, affecting service quality while enabling reception by a higher number of UEs in the same cells.

Innovation Solution

Implementing a mechanism for user equipment and network elements to receive an indication on the transmission mode for inactive/idle reception, allowing UEs to omit or reduce feedback, and enabling network elements to adjust transmission modes accordingly, thereby improving service quality and supporting more UEs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If inactive/idle reception mode is used for multicast, then the number of UEs that can receive multicast in the same cell increases, but transmission errors increase due to lack of feedback

Engineering Contradiction:

Improvenumber of UEs receiving multicastVSAvoidtransmission error rate

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent implements dynamic switching between feedback modes (acknowledgment mode and inactive/idle mode) based on service requirements and network conditions. The network can configure different UEs to use different reception modes, allowing flexible adaptation between reliability and capacity requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the feedback parameter state by introducing an indication mechanism that signals whether feedback should be sent. This allows the system to transition between full feedback operation and reduced feedback operation, effectively controlling the trade-off between transmission reliability and network capacity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If feedback is sent for every multicast reception, then transmission reliability improves, but network overhead increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidnetwork overhead

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent extracts the feedback requirement from the mandatory multicast reception process by introducing an indication mechanism. When the inactive/idle reception indication is set, feedback transmission is removed from the communication flow, reducing network overhead while maintaining essential reception functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies partial feedback action by allowing UEs to send feedback only when necessary (when acknowledged mode is used) rather than for every multicast transmission. This selective feedback approach reduces overall network overhead while maintaining reliability for services that require it.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250220756A1Negotiation applicability for inactive or idle reception of a multicast service

Publication Date: 2025.07.03 NOKIA OF AMERICA CORP

AI summary

An apparatus, in a user equipment, is provided. the apparatus comprising: at least one processor and at least one memory including computer program code. the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to receive an indication whether a transmission mode for inactive/idle reception of multicast is applied for a multicast session, and based on the indication, perform procedures to enable reception of the multicast session using the transmission mode for inactive/idle mode reception.