S-TTI Reference Signal Energy Ratio Determination
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting short transmission time interval (S-TTI) based communication, particularly in determining the ratio of reference signal energy to physical downlink shared channel energy, especially when interference occurs and reference signals are not received in specific S-TTIs, which affects communication efficiency.
Innovation Solution
A method for determining the ratio of reference signal energy per resource element to physical downlink shared channel energy in S-TTI based communication, where the user equipment (UE) assesses the presence of reference signals in specific S-TTIs and adjusts transmission power accordingly, using specific rules to handle interference and ensure efficient channel transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE determines RS EPRE to PDSCH EPRE ratio in legacy L-TTI based systems, then the communication is compatible with existing standards, but the communication efficiency and speed are limited by the longer transmission time interval
Solution Approach 1:
The patent segments the legacy L-TTI into multiple shorter S-TTIs to enable faster communication. By dividing the transmission time interval and separately determining the RS EPRE to PDSCH EPRE ratio for each S-TTI, the system achieves lower latency and higher communication speed while maintaining reliability through per-S-TTI optimization.
Solution Approach 2:
The patent introduces dynamic determination of the RS EPRE to PDSCH EPRE ratio for each S-TTI based on whether a reference signal is present. This dynamic adaptation allows the system to optimize communication parameters in real-time for each short interval, improving both speed and reliability in varying channel conditions.
2Reliability
If the UE receives additional downlink channel transmission power ratio values when RS is not received in specific S-TTIs, then the communication reliability is improved under interference, but the device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure multiple downlink channel transmission power ratio values corresponding to different S-TTIs. When the UE encounters interference and cannot receive the RS, it can directly use the pre-configured ratio value for that S-TTI without complex real-time calculations, thus improving reliability while limiting processing complexity.
Solution Approach 2:
The patent changes the parameter of transmission power ratio dynamically based on RS reception status. By switching between different pre-configured ratio values depending on whether the RS is received in each S-TTI, the system adapts to interference conditions without requiring complex real-time parameter optimization, balancing reliability and complexity.
3Productivity
If the system uses fixed transmission power ratios for all S-TTIs, then the device complexity is reduced, but the communication efficiency deteriorates when interference patterns vary across different S-TTIs
Solution Approach 1:
The patent applies local quality by determining and applying different RS EPRE to PDSCH EPRE ratio values for each individual S-TTI based on local interference conditions. Instead of a uniform fixed ratio, each S-TTI can have an optimized power ratio tailored to its specific channel conditions, improving communication efficiency without requiring full system-wide complexity.
Data Source
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AI summary
The present invention provides a method for carrying out S-TTI-based communication performed by a terminal supporting a relatively short transmission time interval (S-TTI) compared to a legacy transmission time interval (L-TTI) in a wireless communication system. The method is characterized by: determining a value with respect to a ratio of reference signal energy per resource element (RS EPRE) to physical downlink shared channel energy per resource element (PDSCH EPRE); and carrying out S-TTI-based communication on the basis of the value with respect to the ratio, wherein the value with respect to the ratio is determined in an S-TTI unit.