Dynamic Subcarrier Spacing for Wireless Broadcast Channels
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data/control information to be transmitted by base stations in wireless communication systems poses challenges due to limited resources, requiring efficient methods for uplink/downlink data and control information transmission while reducing latency and supporting high-frequency bands.
Innovation Solution
A method involving the detection and transmission of downlink signals using different subcarrier spacings, where a broadcast channel is transmitted with a first subcarrier spacing, and downlink data channels carry system information using a second subcarrier spacing, as indicated by the broadcast channel, to optimize signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single subcarrier spacing is used for all channels, then device complexity is reduced, but adaptability to different frequency bands and services deteriorates
Solution Approach 1:
The patent implements dynamic subcarrier spacing selection where the UE adapts the subcarrier spacing based on the frequency band and service type. The UE can switch between first subcarrier spacing (e.g., 15 kHz) for broadcast channels and second subcarrier spacing (e.g., 30 kHz or 60 kHz) for data channels, enabling flexible adaptation to different operational conditions while maintaining manageable device complexity through standardized selection criteria.
Solution Approach 2:
The patent changes the subcarrier spacing parameter according to the frequency band and service requirements. By defining multiple subcarrier spacing options (first and second subcarrier spacings) and selecting appropriate values based on frequency range and service type, the system achieves enhanced adaptability without requiring complete redesign of the communication protocol.
2Productivity
If more resources are allocated for data transmission, then throughput increases, but latency increases due to resource allocation overhead
Solution Approach 1:
The patent applies preliminary action by pre-configuring subcarrier spacing information in system information blocks (SIBs) and broadcast channels. This allows the UE to determine the appropriate subcarrier spacing for data channels before actual data transmission begins, eliminating the need for real-time resource allocation negotiations and reducing latency while maintaining high throughput efficiency.
3Productivity
If traditional subcarrier spacing is used in high-frequency bands, then compatibility with legacy systems is maintained, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies local quality by using different subcarrier spacing values for different frequency bands and service types. In high-frequency bands (e.g., mmWave), the system uses larger subcarrier spacings (second subcarrier spacing) to accommodate wider bandwidths and higher data rates, while maintaining compatibility with legacy systems through standardized information signaling. This localized optimization improves transmission efficiency without compromising overall system compatibility.
Data Source
AI summary
A default subcarrier spacing for use in transmission/reception of a broadcast channel is defined for each frequency range. A base station transmits a broadcast channel in a frequency band, using the default subcarrier spacing defined for a frequency range to which the corresponding frequency band belongs. A user equipment attempts to detect a broadcast channel in the frequency band where a cell search is being attempted, using the default subcarrier spacing defined for a frequency range to which the frequency band belongs.