Narrowband Control Channel Segmentation for IoT Reliability
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Solution Overview
Problem
Low cost terminals in IoT networks face poor reliability in control information transmission due to deep fading issues in narrowband systems, affecting system performance.
Innovation Solution
A method is introduced where a base station categorizes downlink control information, extends the physical broadcast channel to create sub-control channel domains, and selects a sub-control channel domain with good channel state for transmitting control information, instructing the terminal to select a channel that meets specific standards for quality and priority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is transmitted in narrowband systems, then bandwidth is saved and device cost is reduced, but control information transmission reliability deteriorates due to deep fading
Solution Approach 1:
The common control channel domain is divided into multiple narrowband sub-control channel domains, each with different position identifiers. This segmentation allows the system to select specific sub-domains for control information transmission based on channel conditions, avoiding deep fading in certain frequency regions while maintaining narrowband operation for cost reduction.
Solution Approach 2:
The system dynamically selects which sub-control channel domain to use for transmitting control information based on real-time channel state feedback. The base station adjusts the position identifier selection according to reported channel quality, enabling adaptive transmission that avoids deep fading conditions while maintaining narrowband efficiency.
2Reliability
If a single common control channel domain is used, then system complexity is reduced, but control information transmission reliability deteriorates due to inability to adapt to channel variations
Solution Approach 1:
The control channel domain is segmented into multiple sub-domains with different position identifiers, allowing selective usage based on channel conditions. This provides reliability improvement through diversity selection while keeping each individual sub-domain simple in structure.
Solution Approach 2:
The system implements feedback mechanisms where terminals report channel quality metrics (such as RSRP) for different sub-control channel domains. The base station uses this feedback to intelligently select the optimal position identifier, achieving reliable transmission without requiring complex pre-planned channel structures.
3Reliability
If position identifier is added to extend physical broadcast channel, then control information transmission reliability is improved through sub-control channel domain selection, but message length and processing complexity increase
Solution Approach 1:
Instead of processing all possible sub-control channel domains, the system uses channel state feedback to identify and process only the most suitable position identifier. This partial action approach achieves reliable transmission by focusing computational resources on the optimal selection rather than exhaustive processing of all options.
Solution Approach 2:
The position identifier serves as a key parameter that changes based on channel conditions. By selecting different position identifier values corresponding to different sub-control channel domains, the system adapts to varying channel states without requiring complete reconfiguration of the control channel structure, thus limiting processing complexity increases.
Data Source
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AI summary
The present invention discloses a method for transmitting control information, including: categorizing downlink control information into common control information and dedicated control information; extending a physical broadcast channel: dividing a common control channel domain into a plurality of narrowband sub-control channel domains by adding a position identifier; before a connection is established, sending, according to the position identifier, the common control information in each sub-control channel domain of the common control channel domain; and after the connection is established, selecting, according to a channel state of each sub-control channel domain, a sub-control channel domain with a channel state that complies with a set standard, for sending the dedicated control information. In the present invention, a channel state selection scheme is set, so that a base station selects a sub-control channel domain with good connection quality and low load when sending downlink control information to a narrowband user terminal, thereby effectively improving reliability of control information transmission on a control channel for the narrowband user terminal.