MTC PDSCH Reception via MBSFN Subframe Segmentation

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Solution Overview

Problem

Machine-type communication (MTC) apparatuses in coverage extension regions face difficulties in receiving physical downlink control channels (PDCCH) and physical downlink shared channels (PDSCH) due to low performance and extended cell coverage, leading to challenges in resource allocation and decoding success rates.

Innovation Solution

Implementing a transmission and reception method where the base station repeatedly transmits PDCCHs and PDSCHs on multiple subframes, and the MTC apparatus receives configuration information on multicast-broadcast single-frequency network (MBSFN) subframes, with increased power for cell-specific reference signals (CRS) on a portion of resource blocks, allowing for dedicated subframes for MTC communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station repeatedly transmits PDCCHs and PDSCHs on multiple subframes to MTC apparatuses in coverage extension regions, then the reception and decoding performance of MTC apparatuses is improved, but a very large quantity of resources is used, causing damage to existing UE performance

Engineering Contradiction:
Improvereception and decoding performance of MTC apparatusesVSAvoidquantity of resources used
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments the transmission resources by introducing MBSFN subframes dedicated for MTC apparatuses in coverage extension regions. Instead of repeatedly transmitting PDCCHs and PDSCHs across all subframes, the system divides specific subframes (MBSFN subframes) for MTC use while keeping other subframes for normal UE operations. This segmentation allows MTC apparatuses to receive enhanced transmissions without consuming excessive resources that would impact existing UE performance.

Inventive Principle:
Principle #1Segmentation

2Device complexity

If the base station transmits channels to MTC apparatuses in coverage extension regions as if to normal UEs, then the system maintains simplicity, but the MTC apparatus has difficulty in receiving the channel due to low performance and extended coverage

Engineering Contradiction:
Improvesystem complexityVSAvoidchannel reception capability of MTC apparatuses
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent applies local quality by transmitting cell-specific reference signals (CRS) with increased power specifically on a portion of resource blocks within MBSFN subframes allocated for MTC apparatuses. This localized power enhancement targets only the regions where MTC apparatuses need improved reception, rather than increasing power system-wide. The base station transmits CRS with higher power on specific resource blocks to improve channel estimation and decoding for MTC apparatuses in coverage extension regions, while maintaining normal transmission levels for other UEs.

Inventive Principle:
Principle #3Local quality

3Reliability

If dedicated subframes are allocated for MTC communication, then the decoding success rate of MTC apparatuses is improved, but the resource allocation complexity increases

Engineering Contradiction:
Improvedecoding success rateVSAvoidresource allocation complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements universality by configuring MBSFN subframes that serve dual purposes: they are dedicated for MTC apparatus communication while still maintaining the broader MBSFN framework used for multimedia broadcast multicast services. The base station transmits PDCCHs and PDSCHs to MTC apparatuses on these MBSFN subframes, and the same subframe structure supports both MTC and traditional broadcast/multicast functions. This multi-functionality approach allows dedicated resource allocation for MTC without creating entirely separate resource management systems, thereby reducing overall complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS10863320B2Transmission/reception method for MTC apparatus
Publication Date: 2020.12.08 LG ELECTRONICS INC
  • US10863320B2 patent drawing
  • US10863320B2 patent drawing
  • US10863320B2 patent drawing

AI summary

A method for receiving a signal of a first physical downlink shared channel (PDSCH), includes receiving first information specifying a plurality of subframes used for the wireless device, determining multiple downlink subframes, to receive a signal of a first PDSCH, based on the plurality of subframes specified in the first information, receiving the signal of the first PDSCH which is repeated over the determined multiple downlink subframes and based on that the signal of the first PDSCH includes a first system information block (SIB), determining that a signal of a second PDSCH including a data other than the first SIB is not transmitted in the determined multiple downlink subframes, wherein the first SIB is dedicated for the wireless device and different from a SIB for a user equipment (UE) used by a user.