Uplink Transport Block Sizing Using Current and Historical CSI
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Solution Overview
Problem
Existing cellular IoT systems face challenges in maintaining communication quality due to mismatches between the modulation and coding scheme level configured by the base station and the actual channel state of the user equipment, especially when terminals move rapidly, affecting coverage and communication stability.
Innovation Solution
A method for adjusting the transport block size (TBS) based on current and historical channel state information (CSI) to align with the actual channel conditions, allowing terminals to adapt their data block transmission accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base station configures a fixed modulation and coding scheme level for transport block size determination, then the system complexity is reduced and ease of operation is improved, but the communication quality deteriorates when channel states change rapidly due to terminal movement
Solution Approach 1:
The patent introduces dynamic adjustment of transport block size by comparing current CSI with historical CSI. The terminal device dynamically determines whether to adjust TBS based on channel state changes, transforming the fixed TBS determination into a dynamic process that adapts to channel variations while maintaining operational simplicity through automated comparison and adjustment logic
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device reports CSI to the base station, and the base station uses this feedback to adjust transmission parameters. The comparison between current and historical CSI creates a feedback loop that enables adaptive TBS adjustment, improving communication quality while maintaining system operability through structured feedback protocols
2Stability of the object's composition
If the transport block size is determined based on historical channel state information, then the system stability is improved, but the adaptability to current channel conditions deteriorates
Solution Approach 1:
The patent creates a dynamic TBS determination system that transitions from purely historical-based to a hybrid approach comparing current and historical CSI. This dynamic mechanism allows the system to maintain stability through historical reference while adapting to current conditions through real-time comparison, resolving the contradiction between stability and adaptability
Solution Approach 2:
The patent uses historical CSI as preliminary information for TBS determination. By pre-collecting and storing historical channel state information, the system prepares baseline data that guides initial TBS selection, then refines this selection based on current channel conditions, combining the benefits of preliminary preparation with real-time adaptation
3Adaptability or versatility
If the terminal device adjusts the transport block size frequently to match rapid channel changes, then the adaptability is improved, but the loss of time for processing and signaling increases
Solution Approach 1:
The patent implements partial adjustment of TBS by comparing current CSI with historical CSI and adjusting only when necessary. Rather than continuously adjusting TBS for every channel variation, the system performs selective adjustments based on significant channel state changes, reducing processing overhead while maintaining adequate adaptability to channel conditions
Solution Approach 2:
The patent introduces periodic CSI reporting and comparison mechanisms where the terminal device evaluates channel state changes at regular intervals rather than continuously. This periodic approach balances adaptability with processing efficiency by updating TBS adjustments only when periodic evaluations indicate significant channel variations, reducing signaling frequency and processing time
Data Source
AI summary
A method for transporting data block includes: determining an initial transport block size (TBS) according to received current downlink control information (DCI); acquiring current first channel state information (CSI) and second channel state information (CSI) acquired last time; adjusting the initial TBS according to the first CSI and the second CSI to obtain an adjusted TBS; and sending, according to the adjusted TBS, uplink data corresponding to the current DCI to a base station.