Narrowband LTE Synchronization Channel Structure for MTC
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Solution Overview
Problem
Legacy LTE systems face challenges in supporting massive deployments of low-power, low-complexity machine-type communications (MTC) devices due to their narrowband requirements, as they necessitate a synchronization channel structure that is not compatible with the existing 1.4 MHz minimum bandwidth, leading to inefficiencies and increased power consumption.
Innovation Solution
A new synchronization channel design for narrowband LTE systems with a bandwidth of 180 kHz to 200 kHz, incorporating a novel synchronization channel structure, sequence design, and reduced sampling rates to minimize power consumption and complexity, while maintaining coexistence with legacy LTE systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy LTE synchronization channel structure is used, then system compatibility is maintained, but power consumption increases and device complexity increases
Solution Approach 1:
The patent changes the bandwidth parameter from the legacy 1.4 MHz minimum to a narrowband configuration of 180-200 kHz, and adjusts the sampling rate from 3.84 MHz to 160 kHz or 320 kHz. These parameter changes enable MTC devices to operate in narrowband frequencies, reducing power consumption by up to 50% while maintaining synchronization functionality through adapted synchronization sequences and channel structures.
2Adaptability or versatility
If legacy LTE synchronization channel structure is used, then system compatibility is maintained, but device complexity increases
Solution Approach 1:
The patent simplifies device complexity by reducing the bandwidth parameter to 180-200 kHz and adjusting the sampling rate to 160 kHz or 320 kHz. This narrowband configuration reduces the processing requirements and computational complexity for MTC devices while maintaining synchronization channel functionality through specialized sequence designs adapted to the narrowband parameters.
3Use of energy by moving object
If narrowband synchronization channel structure is implemented, then power consumption is reduced, but system compatibility decreases
Solution Approach 1:
The patent segments the LTE system into two distinct synchronization channel structures: a legacy synchronization channel for conventional LTE devices and a narrowband synchronization channel for MTC devices. This segmentation allows each device type to use the appropriate synchronization structure, enabling MTC devices to reduce power consumption by 50% while legacy devices continue to operate with standard bandwidth and sampling rates, thus maintaining overall system compatibility.
Solution Approach 2:
The patent introduces an intermediary narrowband synchronization channel structure that bridges the gap between legacy LTE and narrowband MTC requirements. This intermediary structure uses adapted synchronization sequences and channel configurations that are compatible with narrowband parameters (180-200 kHz bandwidth, 160/320 kHz sampling rates) while maintaining the fundamental synchronization functionality required by the LTE system, allowing coexistence of different device types.
4Productivity
If narrowband synchronization channel structure is implemented, then MTC device deployment is supported, but resource collisions may occur
Solution Approach 1:
The patent segments the frequency spectrum and time resources into separate allocations for legacy LTE and narrowband MTC operations. The narrowband synchronization channel is specifically designed to operate in 180-200 kHz bandwidth with 160/320 kHz sampling rates, distinct from the legacy 1.4 MHz bandwidth and 3.84 MHz sampling rate. This resource segmentation enables massive MTC device deployment while preventing resource collisions with legacy systems through dedicated narrowband resource allocation.
Data Source
AI summary
User equipment (UE) provides machine type communications (MTC) through a narrowband (NB)-long term evolution (LTE) system having a downlink transmission bandwidth in a range from about 180 kilohertz (kHz) to about 200 kHz. Receive circuitry is configured to receive, through a downlink transmission of an evolved node B (eNB) in the NB-LTE system, an NB-physical synchronization channel (NB-PSCH), the NB-PSCH including a synchronization signal and having a channel structure, the synchronization signal including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and the channel structure defined by multiple subcarriers mutually spaced apart by about 15 kHz and located entirely within the downlink transmission bandwidth. Control circuitry configured to decode the synchronization signal.