Variable Bandwidth Wireless Device System Information Reception
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Solution Overview
Problem
Legacy LTE/LTE-A systems cannot support wireless devices with varying bandwidths, limiting access for devices with narrower bandwidths like MTC devices, which require lower data transmission rates and reduced RF/baseband complexity.
Innovation Solution
A method and device that allow wireless devices to receive first and second system information in a base band and restricted band, respectively, enabling support for various bandwidths by monitoring the physical downlink control channel within the system bandwidth, and configuring the PDSCH reception band to match the device's capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a base station supports only one bandwidth (e.g., 20 MHz), then the system can provide services to devices supporting that bandwidth, but devices with narrower bandwidths (e.g., 5 MHz MTC devices) cannot access the base station
Solution Approach 1:
The system bandwidth is segmented into multiple bandwidth parts (BWPs), each supporting different bandwidth configurations (e.g., 20 MHz, 10 MHz, 5 MHz, 1.4 MHz). Devices can be assigned to appropriate BWPs based on their capabilities, allowing narrowband MTC devices to access the base station without requiring the entire system bandwidth.
Solution Approach 2:
The base station is designed to support multiple bandwidth configurations simultaneously through a single unified interface. The system can serve both wideband devices (20 MHz) and narrowband devices (1.4 MHz MTC) through the same base station infrastructure, achieving multi-functionality in bandwidth support.
2Use of energy by moving object
If an MTC device uses a smaller operating bandwidth than legacy mobile terminals, then RF/baseband complexity and battery consumption are significantly decreased, but the device cannot access base stations configured for larger bandwidths
Solution Approach 1:
The system dynamically configures bandwidth parts based on device capabilities and service requirements. MTC devices operating in narrowband mode (1.4 MHz) can access base stations by being assigned to appropriate BWPs, while maintaining their low power consumption characteristics. The bandwidth configuration is not fixed but adaptable to different device types.
Solution Approach 2:
The system changes the bandwidth parameter by introducing bandwidth parts with different sizes (1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 20 MHz). This allows MTC devices to operate at their optimal low bandwidth for energy efficiency while the base station maintains flexibility to support multiple bandwidth parameters simultaneously.
3Adaptability or versatility
If the system supports multiple bandwidths through bandwidth parts, then devices with various bandwidth capabilities can access the base station, but the system requires additional mechanism to manage and switch between different bandwidth configurations
Solution Approach 1:
The system uses feedback mechanisms where the base station determines device capabilities and appropriately assigns bandwidth parts. The network controls the switching between different BWPs based on device type, service requirements, and current system conditions, reducing the complexity burden on individual devices.
Solution Approach 2:
The base station acts as an intermediary that manages the complexity of multi-bandwidth support. Rather than requiring each device to handle multiple bandwidth configurations independently, the base station mediates by assigning appropriate BWPs and managing transitions, simplifying the overall system architecture.
Data Source
AI summary
Provided are a method and an apparatus for supporting a variable bandwidth in a wireless communication system. A wireless device receives first system information in a base band and receives second system information in a limited band. The first system information comprises information indicating the limited band.