Slot Format Indication for Simultaneous Uplink Downlink Transmission
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Solution Overview
Problem
In 5G mobile communication systems, the existing slot formats with normal cyclic prefix cannot simultaneously transmit uplink and downlink data for URLLC services, leading to reduced communication efficiency due to latency and reliability issues.
Innovation Solution
A slot format indication method using a slot format index to determine an extended cyclic prefix format that includes downlink, uplink, and flexible symbols, allowing for simultaneous transmission of uplink and downlink data while meeting the latency requirements of URLLC services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slot with normal cyclic prefix is used to transmit URLLC service, then the slot structure is simple and easy to implement, but the latency requirement cannot be met and simultaneous uplink and downlink transmission cannot be achieved
Solution Approach 1:
The patent changes the cyclic prefix parameter from normal to extended, which modifies the slot structure to accommodate both uplink and downlink transmissions while meeting latency requirements. This parameter change enables the slot to support simultaneous bidirectional communication for URLLC services.
Solution Approach 2:
The patent introduces dynamic slot format indication through signaling mechanisms that allow the network to flexibly configure slot formats based on traffic conditions. This dynamic adjustment enables the system to switch between different slot configurations to optimize for simultaneous uplink and downlink transmission when needed.
2Reliability
If a slot with extended cyclic prefix is used to transmit URLLC service, then the transmission latency requirement can be met, but uplink data and downlink data cannot be simultaneously transmitted
Solution Approach 1:
The patent segments the slot into multiple regions with different symbol types (downlink symbols, uplink symbols, and flexible symbols). This segmentation allows different parts of the slot to serve different purposes, enabling simultaneous uplink and downlink transmission while maintaining the extended cyclic prefix structure for latency-critical URLLC services.
Solution Approach 2:
The patent uses dynamic slot format indication to allow flexible configuration of symbol types within the slot. The network can dynamically adjust which symbols are allocated for uplink, downlink, or flexible use based on real-time traffic demands, enabling simultaneous bidirectional transmission when required while preserving the extended cyclic prefix structure.
3Productivity
If flexible slot format configuration is implemented to support simultaneous uplink and downlink transmission, then communication efficiency improves, but system complexity increases
Solution Approach 1:
The patent introduces a slot format indicator (SFI) as an intermediary mechanism that simplifies the configuration process. The SFI carries pre-configured slot format information from the network to the terminal, allowing complex slot format arrangements to be managed through standardized signaling rather than requiring complex real-time negotiations or configurations.
Solution Approach 2:
The patent implements preliminary configuration of slot formats through higher-layer signaling before actual data transmission. The network pre-configures multiple slot format options and indicates which one to use through compact SFI signaling, reducing the complexity of real-time slot format management while enabling flexible adaptation to different transmission scenarios.
Data Source
AI summary
This application provides a slot format indication method and a communication apparatus. The method includes: receiving a slot format index, where the slot format index is used to indicate a row in a slot format table, and the row in the slot format table is used to indicate symbol attributes respectively corresponding to at least 12 symbols, and the symbol attribute includes a location of an uplink symbol U, a downlink symbol D, or a flexible symbol F; and determining a slot format of an extended cyclic prefix based on the slot format index, where the slot format of the extended cyclic prefix includes a downlink symbol D, and at least one uplink symbol U and/or at least one flexible symbol F.