MBSFN Subframe PDCCH Monitoring Optimization

Solution Overview

Problem

In the LTE wireless communication system, particularly in Rel-10 networks, terminals face unnecessary operations and increased power consumption due to the need to check every MBSFN subframe for potential unicast data, even if unicast data transmission is not supported, leading to inefficient data reception.

Innovation Solution

A method where the terminal receives information from the network on PDSCH over MBSFN subframe supportability, allowing it to skip operations in unsupported cases, thereby reducing power consumption by determining whether to interpret PDCCH for receiving PDSCH in MBSFN subframes based on this information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal checks PDCCH in every MBSFN subframe to receive PDSCH, then the terminal can receive unicast data when supported, but unnecessary operations occur when unicast is not supported, increasing power consumption

Engineering Contradiction:

Improvedata reception capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The terminal performs preliminary action by checking system information (SIB13 or RRC connection release message) before entering idle state to determine whether the network supports unicast data transmission in MBSFN subframes. This preliminary check allows the terminal to avoid unnecessary PDCCH monitoring operations in MBSFN subframes when unicast is not supported, thereby reducing power consumption while maintaining reliable data reception when unicast is supported.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the terminal monitors PDCCH in every MBSFN subframe, then unicast data can be received when supported, but operation complexity increases due to unnecessary checks

Engineering Contradiction:

Improveunicast data receptionVSAvoidoperation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The terminal performs preliminary action by checking system information (SIB13 or RRC connection release message) before entering idle state to determine whether the network supports unicast data transmission in MBSFN subframes. This preliminary check allows the terminal to avoid unnecessary PDCCH monitoring operations in MBSFN subframes when unicast is not supported, thereby reducing power consumption while maintaining reliable data reception when unicast is supported.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3723394B1Method and device for receiving a subframe in different forms in a wireless communication system

Publication Date: 2023.01.11 SAMSUNG ELECTRONICS CO LTD

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AI summary

A method performed by a base station in a wireless communication system, the method comprises: transmitting, to a terminal, system information including information associated with a sub-frame configuration of multimedia broadcast multicast service single frequency network, MBSFN, sub-frames; determining a transmission mode of the terminal, the transmission mode indicating one of a first transmission mode and a second transmission mode; transmitting, to the terminal, configuration information of the determined transmission mode of the terminal; transmitting, to the terminal, control information in a physical downlink control channel, PDCCH, in a first sub-frame of the MBSFN sub-frames and transmitting control information in a PDCCH of a second sub-frame of non-MBSFN sub-frames for the terminal, in case that the terminal is configured in the first transmission mode; and transmitting, to the terminal, the control information in the PDCCH in the second sub-frame of the non-MBSFN sub-frames, in case that the terminal is configured in the second transmission mode.