Unlicensed Spectrum Channel Indication for Energy Reduction
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Solution Overview
Problem
Current communication systems face challenges in supporting diverse service requirements, such as eMBB, URLLC, and mMTC, due to limitations in utilizing licensed spectra effectively.
Innovation Solution
A channel indication method and apparatus that utilize an unlicensed spectrum, where a base station determines and indicates suitable subbands that pass channel access through a channel indication signal, enabling terminals to accurately determine these subbands for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a base station transmits channel indication signals on all subbands to ensure complete channel information, then the terminal can accurately determine available subbands, but the energy consumption for channel detection increases significantly
Solution Approach 1:
The patent divides the wideband channel into multiple subbands and selectively indicates only those subbands that pass channel access. Instead of transmitting channel information for all subbands, the base station segments the channel and provides indication signals only for available subbands, reducing the terminal's detection burden and energy consumption while maintaining accurate channel knowledge where needed.
Solution Approach 2:
The patent applies local quality by providing different channel indication information for different subbands. Rather than uniform channel information across the entire bandwidth, the base station transmits targeted indication signals specifically for subbands that are currently accessible, optimizing the information quality locally where it is most needed and reducing overall signaling overhead.
2Adaptability or versatility
If the base station uses detailed channel indication signals to support diverse service requirements, then service flexibility improves, but the system complexity increases
Solution Approach 1:
The patent implements dynamic channel indication where the base station adaptively selects which subbands to indicate based on real-time channel conditions and service requirements. The channel indication mechanism is made dynamic by adjusting the set of indicated subbands according to varying traffic demands, service types (eMBB, URLLC, mMTC), and channel quality, allowing the system to flexibly support diverse services without permanent complexity for all possible scenarios.
Data Source
AI summary
A channel indication method includes: determining, by a base station on an unlicensed spectrum, one or more first subbands that pass a channel access; generating, by the base station, a channel indication signal to indicate the one or more first subbands that pass the channel access; and transmitting, by the base station, the channel indication signal to a terminal to determine, based on the channel indication signal, the one or more first subbands that pass the channel access. The channel indication signal comprises downlink control information (DCI), and at least one information field in the DCI indicates the one or more first subbands that pass the channel access.