Slot Format Indication Bit Length Adaptation in NR TDD Systems
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Solution Overview
Problem
The existing wireless communication technologies in new radio (NR) time division duplex (TDD) systems face challenges with large resource overhead and poor flexibility in configuring slot format indication (SFI) index information due to the use of 8 bits to indicate up to 256 configuration possibilities, limiting the efficient dynamic DL/UL configuration.
Innovation Solution
A method and device for detecting and configuring slot format indication by obtaining and transmitting the bit length of SFI index information, allowing for flexible selection of slot format configurations, reducing resource overhead, and optimizing the bit length based on specific deployment scenarios, thereby enhancing the flexibility of SFI index information configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 8 bits are used to indicate SFI index information to support up to 256 configuration possibilities, then the coverage of slot format configurations is improved, but the resource overhead of PDCCH increases
Solution Approach 1:
The patent segments the slot format configuration space by dividing the 256 possible configurations into multiple subsets, each indicated by a different SFI index value. This allows the system to indicate only the relevant subset based on current needs, reducing the number of bits required in PDCCH while maintaining full configuration coverage capability.
Solution Approach 2:
The patent enables dynamic adjustment of the SFI bit length based on the actual number of slot format configurations needed. The system can adaptively select between different bit lengths (e.g., 4 bits, 6 bits, or 8 bits) depending on the deployment scenario and configuration requirements, optimizing the balance between configuration coverage and PDCCH resource overhead.
2Quantity of substance
If the bit length of SFI index information is reduced to decrease resource overhead, then the PDCCH resource overhead is reduced, but the flexibility in configuring slot formats is limited
Solution Approach 1:
The patent changes the parameter of SFI bit length from a fixed 8 bits to a variable parameter that can be configured according to specific needs. By adjusting this parameter, the system can optimize between resource overhead and configuration flexibility, using shorter bit lengths when fewer configurations are needed and longer bit lengths when more configurations are required.
Solution Approach 2:
The patent creates a universal SFI indication mechanism that can accommodate different bit lengths and configuration scenarios through a unified framework. The same basic SFI mechanism can be adapted to support 4-bit, 6-bit, or 8-bit indications depending on the deployment scenario, making the system multi-functional and broadly applicable.
Data Source
AI summary
A method and a device for detecting slot format indication, and a method and a device for configuring slot format indication are provided. The method for detecting slot format indication is applied to a terminal and includes: obtaining a bit length of SFI index information of a target cell or a target carrier and a slot format configuration set corresponding to the bit length; detecting the SFI index information of the target cell or the target carrier; and determining a slot format configuration corresponding to the detected SFI index information based on the detected SFI index information and the slot format configuration set corresponding to the bit length of the detected SFI index information.