Slot Format Validation for Selective Uplink Cancellation
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Solution Overview
Problem
In wireless communication networks, particularly in 5G NR systems, unnecessary uplink transmissions due to misinterpretation of slot format indicators (SFIs) lead to power and resource wastage, especially in semi-persistent scheduling (SPS) scenarios where UEs may incorrectly decode downlink data and transmit unnecessary HARQ feedback.
Innovation Solution
Implementing group-based slot format validation mechanisms where base stations transmit SFIs with validation fields to selectively indicate the validity of SFIs for different groups of UEs, allowing UEs to cancel or drop uplink transmissions based on SFI validation, thereby reducing unnecessary decoding and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations transmit slot format indicators (SFIs) to all user equipments (UEs) without validation, then all UEs can potentially transmit uplink data, but unnecessary uplink transmissions occur leading to power and resource wastage
Solution Approach 1:
The patent applies local quality by introducing validation fields that provide differentiated information to different groups of UEs. The validation field indicates whether an SFI is valid for specific UE groups, allowing each UE to determine locally whether to transmit or cancel uplink transmissions based on its group membership, thereby avoiding unnecessary transmissions and reducing power consumption.
Solution Approach 2:
The patent segments UEs into different groups based on validation field indicators. By dividing the UE population into groups that receive different validation statuses for the same SFI, the system enables selective uplink transmission cancellation, preventing power waste from unnecessary transmissions while maintaining productivity for UEs that should transmit.
2Loss of energy
If base stations transmit validation fields with SFIs to indicate validity for different UE groups, then unnecessary uplink transmissions are reduced, but downlink signaling overhead increases
Solution Approach 1:
The validation field serves multiple functions: it indicates SFI validity status, identifies UE group memberships, and enables selective transmission cancellation all within a single signaling element. This multi-functionality reduces the need for separate signaling messages, thereby limiting the increase in downlink signaling overhead while achieving energy conservation.
Solution Approach 2:
The patent changes the parameter structure of downlink signaling by incorporating validation fields with bit patterns that encode both validity status and group identification information. This parameter encoding allows compact representation of validation information, minimizing the increase in signaling overhead while enabling precise control over uplink transmission behavior.
3Ease of operation
If UEs transmit uplink data without validating SFI applicability, then communication simplicity is maintained, but resource utilization efficiency decreases
Solution Approach 1:
The patent implements preliminary action by having UEs check validation fields before transmitting uplink data. This pre-transmission validation step ensures that UEs only transmit when the SFI is valid for their group, improving resource utilization efficiency. The validation check is integrated into the existing transmission decision process, maintaining operational simplicity while enhancing productivity.
Data Source
AI summary
Systems, methods, and mechanisms for modifying or cancelling uplink transmissions using dynamic slot format validation are provided. One aspect of the present disclosure includes a method of wireless communication performed by a user equipment (UE). The method of wireless communication includes determining that an uplink (UL) transmission is configured for a first time period; monitoring for a slot format indicator (SFI) validation associated with the first time period; and determining, based at least in part on the monitoring, whether to transmit the UL transmission during the first time period.