Narrowband IoT Multicast Reception via SC-MCCH Scheduling
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Solution Overview
Problem
Current IoT devices, such as NB-IoT, BL, and CE UEs, face challenges in efficiently processing multicast data due to limitations in power consumption and bandwidth, particularly in wide coverage areas, as they are designed for unicast data transmission and lack effective methods for receiving multicast data.
Innovation Solution
A method and apparatus for receiving and transmitting single-cell multicast data using a UE configured to operate in a narrow band with low power, involving the reception of carrier information for the Single Cell-Multicast Control Channel (SC-MCCH) and monitoring SC-MCCH scheduling information on the physical downlink control channel (PDCCH) to access a network service with a channel bandwidth limited to 200 kHz or lower, enabling efficient multicast data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If typical LTE or LTE-Advanced technology is applied to IoT devices, then data transmission capability is improved, but power consumption increases and device cost increases
Solution Approach 1:
The patent segments the communication functionality by introducing separate control channels (NPDCCH, MPDCCH) and data channels (NPDSCH, MPDSCH) optimized for different IoT requirements. The segmentation allows the system to provide full LTE capability when needed while enabling simplified, low-power operation for basic IoT applications, thus resolving the contradiction between transmission capability and power consumption.
Solution Approach 2:
The patent changes key system parameters including bandwidth (supporting 200 kHz or lower), complexity level (BL UE, CE UE categories), and power consumption characteristics. By defining specific parameter ranges and operational modes, the system can adapt between high-performance and low-power states, allowing IoT devices to operate efficiently across different requirements.
2Use of energy by moving object
If NB-IoT technology is used to reduce power consumption and costs, then device acceptance and power efficiency are improved, but support for multicast data transmission is limited
Solution Approach 1:
The patent implements universality by designing a multicast reception framework that works across multiple UE types (NB-IoT, BL, CE) and multiple operation modes. The SC-MCCH and SC-MTCH channels provide universal multicast functionality that can be accessed by different device categories, enabling power-efficient multicast support without sacrificing adaptability to various IoT application requirements.
Solution Approach 2:
The patent introduces dynamic elements including configurable scheduling information, flexible resource allocation, and adaptive monitoring mechanisms. UEs can dynamically adjust their reception behavior based on multicast service requirements and channel conditions, allowing the system to maintain low power consumption while providing versatile multicast support when needed.
3Area of stationary object
If LTE technology is applied to support wide coverage area communication, then coverage is improved, but the complexity of processing multicast data increases
Solution Approach 1:
The patent segments the control and data transmission into specialized channels (SC-MCCH for control, SC-MTCH for data) with simplified processing requirements. By separating multicast control functions from general LTE procedures and defining specific channel structures, the system maintains wide coverage capability while reducing the complexity of multicast data processing for IoT devices.
Solution Approach 2:
The patent employs simplified, purpose-built channel structures and processing procedures specifically designed for IoT multicast requirements rather than using full LTE complexity. The narrowband optimization and reduced processing requirements enable wide coverage with lower complexity, effectively using simplified 'disposable' processing approaches for multicast operations.
Data Source
AI summary
Disclosed are a detailed method and apparatus for receiving multicast data by an IoT UE required to operate with low power and at low cost. Further disclosed are a method and an apparatus for processing multicast data by a Bandwidth-reduced Low-complexity (BL) UE, a Coverage-Enhancement (CE) UE, or a NarrowBand-IoT (NB-IoT) UE. A method of receiving single-cell multicast data by a UE includes receiving carrier information for Single Cell-Multicast Control Channel (SC-MCCH) reception through system information, monitoring SC-MCCH scheduling information on a PDCCH based on the carrier information, and receiving an SC-MCCH on a PDSCH based on the SC-MCCH scheduling information. The UE is configured to be allowed to access a network service having a channel bandwidth limited to 200 kHz or lower or to operate in a bandwidth limited to 6 PRBs.