Dynamic Repetition Window Configuration for Uplink URLLC Latency
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Solution Overview
Problem
Conventional techniques for uplink repetition-based transmissions in wireless communications systems are inadequate as they often require a transport block to be available before transmission, leading to inefficiencies and high latency, especially when using fixed repetition windows.
Innovation Solution
The system allows user equipment (UE) to select a repetition window configuration based on the availability of the transport block, enabling either fixed or sliding window configurations to optimize transmission timing and reduce latency, with the base station determining the used configuration through hypothesis testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed repetition window is used for uplink transmission, then the transmission timing is simplified and predictable, but the latency increases when the transport block becomes available after the first TTI of the repetition window
Solution Approach 1:
The patent introduces dynamic repetition window configuration where the UE can select from multiple predefined repetition window configurations (e.g., different numbers of repetitions, different timing offsets) based on when the transport block becomes available. This allows the system to adapt the repetition window dynamically rather than using a fixed configuration, thereby reducing latency while maintaining manageable complexity through predefined options.
Solution Approach 2:
The patent changes the parameter of repetition window configuration by allowing the UE to select different configurations based on availability timing. The base station provides a set of possible repetition window configurations, and the UE selects the appropriate one based on when the transport block is ready, effectively changing the timing parameters to optimize both latency and reliability.
2Loss of time
If multiple repetition window configurations are provided for the UE to select from, then the latency is reduced by allowing flexible transmission timing, but the complexity at the base station increases due to hypothesis testing to determine the used configuration
Solution Approach 1:
The base station performs preliminary action by providing a predefined set of repetition window configurations to the UE before transmission occurs. This allows the UE to select from known options without requiring complex real-time determination at the base station. The configurations are prepared in advance, and the base station only needs to identify which pre-provided configuration was used, reducing the complexity burden during transmission.
Solution Approach 2:
The patent uses copying by providing multiple copies of repetition window configurations to the UE. Instead of the base station dynamically determining the optimal configuration in real-time, the base station provides a set of candidate configurations (copies), and the UE selects the appropriate one. The base station then uses hypothesis testing to identify which configuration was used, which is a simpler approach compared to real-time optimization.
3Stability of the object's composition
If the UE waits until the first TTI of a fixed repetition window to transmit, then the transmission is synchronized with the repetition window, but the productivity decreases when the transport block is not ready by then
Solution Approach 1:
The patent makes the repetition window dynamic by allowing the UE to select from multiple configurations based on when the transport block becomes available. If the transport block is ready early, the UE can select a configuration that allows earlier transmission. If it becomes available later, the UE selects an appropriate configuration accordingly. This dynamic adaptation maintains synchronization while improving productivity by avoiding unnecessary delays.
Solution Approach 2:
The patent changes the timing parameters of the repetition window based on transport block availability. The UE selects different repetition window configurations (with different starting TTIs and durations) depending on when the transport block is ready, thereby adjusting the synchronization point to optimize both stability and productivity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a user equipment (UE) may be configured to transmit a transport block multiple times in a set of transmission time intervals (TTIs) of a repetition window to improve the chances that the transport block is received by a receiving device. In some cases, however, the transport block may not be available to be transmitted in the repetition window until after a first TTI of the repetition window. In such cases, the UE may use the techniques described herein to identify appropriate configurations for transmitting the transport block in the repetition window. In particular, the UE may determine whether to use a fixed repetition window or a sliding repetition window for transmitting the transport block based on various factors in an attempt to satisfy latency and reliability constraints associated with the transport block.