NB-IoT System Information Reception via N-PBCH and Legacy CRS
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting the increasing data traffic, higher transmission rates, and energy efficiency, particularly in Narrow Band IoT (NB-IoT) systems, where legacy LTE CRS information is not effectively utilized, and there is a need for efficient methods to transmit and receive system information and downlink data using multiple NB-IoT carriers.
Innovation Solution
A method for receiving system information in NB-IoT systems involves acquiring time and frequency synchronization using Narrowband Synchronization Signals and receiving system information through Narrowband Physical Broadcast Channels, which includes operation mode and legacy CRS sequence index information, with channel raster offset and PRB index details, allowing for efficient resource allocation and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If legacy LTE CRS information is not utilized in NB-IoT systems, then system complexity is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies universality by enabling NB-IoT systems to utilize legacy LTE CRS (Cell-specific Reference Signal) resources for multiple purposes including channel estimation, synchronization, and data transmission. The system repurposes existing LTE infrastructure components to serve NB-IoT functionality, allowing legacy CRS to be used in both LTE and NB-IoT contexts without additional dedicated resources.
Solution Approach 2:
The patent changes key parameters including PRB (Physical Resource Block) indexing, channel raster offset values, and CRS sequence indices to enable compatibility between NB-IoT and legacy LTE systems. By adjusting these parameters, the system can efficiently allocate and utilize legacy CRS resources while maintaining proper NB-IoT operation standards.
2Productivity
If additional system information is transmitted through N-PBCH, then resource allocation efficiency is improved, but information transmission overhead increases
Solution Approach 1:
The patent merges system information transmission by integrating operation mode information, legacy CRS sequence index, PRB index, and channel raster offset into a unified N-PBCH (Narrowband Physical Broadcast Channel) message structure. This consolidation allows multiple critical parameters to be transmitted together, improving resource allocation efficiency while managing information overhead through structured encoding.
3Adaptability or versatility
If multiple NB-IoT carriers are supported, then system versatility is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the multi-carrier system into independent NB-IoT carrier instances, each with its own set of parameters including PRB indices, channel raster offsets, and CRS sequence information. This segmentation allows the system to support multiple carriers while managing complexity through modular parameter sets that can be independently configured and processed.
Data Source
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AI summary
A method for receiving system information in a wireless communication system supporting a Narrow Band (NB)-Internet of Things (IoT), the method performed by a terminal comprising: receiving a narrowband synchronization signal (NBSS) through a narrowband (NB) from a base station; acquiring, based on the NBSS, time synchronization and frequency synchronization with the base station; and receiving the system information related to the NB-IoT through a narrowband physical broadcast channel (N-PBCH) from the base station, wherein the system information includes at least one of operation mode information indicating an operation mode of an NB-IoT system or control information indicating an index of a legacy CRS(cell-specific reference signal) sequence, and wherein the control information is associated with a PRB (physical resource block) index of a PRB to which the legacy CRS is transmitted.