Terminal Control for Multicast PDSCH Reception with Energy Ratios

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Solution Overview

Problem

In future radio communication systems, such as NR, appropriate reception of multicast transmission using a physical downlink shared channel (PDSCH) is hindered without sufficient information on the energy of the PDSCH and associated reference signals, particularly when scrambled by a group-RNTI (G-RNTI).

Innovation Solution

A terminal equipped with a receiving section to receive a PDSCH scheduled using a specific type of RNTI, employing a value associated with the energy ratio between the PDSCH and its reference signal, such as DM-RS or PT-RS, to facilitate accurate demodulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multicast transmission is performed using PDSCH scheduled by G-RNTI, then multicast service capability is improved, but reception accuracy deteriorates due to insufficient energy information

Engineering Contradiction:

Improvemulticast service capabilityVSAvoidreception accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The base station performs preliminary action by pre-configuring and notifying the terminal of the energy ratio information (beta values) before multicast transmission occurs. This allows the terminal to have the necessary energy information available in advance to accurately receive and demodulate the multicast PDSCH, resolving the reception accuracy problem while maintaining multicast service capability.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If energy ratio information is provided for multicast PDSCH, then reception accuracy is improved, but system complexity increases

Engineering Contradiction:

Improvereception accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies universality by using the same energy ratio information mechanism (beta values) for both unicast and multicast PDSCH transmissions. The base station notifies the terminal of energy ratio information through existing RRC signaling and DCI formats, allowing the same signaling infrastructure to serve multiple purposes without increasing system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If separate energy ratio configuration is implemented for multicast, then reception accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improvereception accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent merges the energy ratio information notification for multicast PDSCH with the existing unicast PDSCH signaling mechanisms. The base station uses the same RRC configuration and DCI fields to convey energy ratio information for both unicast and multicast transmissions, combining multiple functions into a single signaling framework and avoiding duplicate overhead.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12395294B2Terminal, radio communication method, base station, and system

Publication Date: 2025.08.19 NTT DOCOMO INC

AI summary

A terminal, as disclosed, includes: a receiver that receives a downlink control information (DCI) using a specific type of radio network temporary identifier (RNTI); and a processor that controls reception of a physical downlink shared channel (PDSCH) scheduled by the DCI, based on a configuration associated with the specific type. In other aspects, a radio communication method, a base station, and a system are also disclosed.