ON/OFF Time Mask Transient Period Placement for Uplink
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Solution Overview
Problem
The existing ON/OFF time masks defined for LTE systems are inadequate for shorter transmission time intervals (TTIs), leading to significant performance degradation due to the increased significance of transient periods relative to TTI duration.
Innovation Solution
A method in a wireless device to determine the allowed placement and duration of a transient period for the ON/OFF time mask based on the received uplink grant, optimizing the placement to overlap with either reference symbols or data symbols of scheduled uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing ON/OFF time masks are used for shorter TTIs, then the mask structure is simple, but system performance degrades significantly due to increased transient period significance
Solution Approach 1:
The patent applies dynamics by making the ON/OFF time mask adaptable rather than fixed. The mask parameters (transient period duration, reference signal position) are dynamically adjusted based on the scheduled TTI duration and transmission characteristics. This allows the mask to optimize performance for each specific transmission scenario while maintaining a manageable structure through algorithmic control.
Solution Approach 2:
The patent changes key parameters of the ON/OFF time mask including transient period duration and reference signal position based on the scheduled TTI length and transmission parameters. By varying these parameters adaptively, the system maintains performance for shorter TTIs without requiring a completely new mask structure, thus resolving the contradiction between structural simplicity and performance reliability.
2Productivity
If transient period is placed outside TTI boundaries, then TTI utilization is maximized, but power ramping cannot be completed within the transmission window
Solution Approach 1:
The patent resolves this contradiction by moving the transient period placement decision from a binary choice (inside or outside TTI) to a multi-dimensional optimization problem. The system simultaneously determines optimal transient period duration, reference signal position, and TTI boundary alignment based on multiple constraints including power ramping requirements, reference signal timing, and TTI utilization goals. This dimensional expansion allows finding optimal solutions that balance all competing requirements.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and pre-positioning reference signals and transient periods based on scheduled TTI parameters before actual transmission occurs. The uplink grant indicates predetermined reference signal positions and transient period characteristics, allowing the wireless device to prepare the transmission structure in advance, ensuring both power ramping completion and efficient TTI utilization are achieved.
3Device complexity
If reference signal position is fixed, then signal processing is simplified, but flexibility to optimize performance for different TTI lengths is reduced
Solution Approach 1:
The patent makes reference signal position dynamic rather than fixed. The reference signal position is determined based on the scheduled TTI duration and transmission parameters, allowing it to adapt to different TTI lengths and transmission scenarios. This dynamic positioning maintains signal processing simplicity through algorithmic determination while providing the flexibility needed to optimize performance for varying TTI configurations.
Solution Approach 2:
The patent changes the reference signal position parameter based on scheduled TTI length and transmission characteristics. By varying this parameter adaptively, the system optimizes performance for different TTI lengths without requiring completely different signal processing approaches. The parameter change is implemented through standardized algorithms that maintain processing simplicity while achieving adaptability.
Data Source
AI summary
A method in a wireless device is disclosed. The wireless device receives an uplink grant from a network node, the uplink grant scheduling one or more uplink transmissions by the wireless device. The wireless device selects an ON/OFF time mask to use for transmitting the one or more uplink transmissions. The wireless device determines, based on the received uplink grant, an allowed placement of a transient period of the selected ON/OFF time mask and a duration of the transient period to use for the one or more uplink transmissions.