UE TTI Resource Selection for Wireless Communication
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Solution Overview
Problem
In wireless communication systems, the use of multiple transmission time interval (TTI) lengths can lead to resource fragmentation, particularly when user equipment (UEs) select short TTIs (sTTIs) indiscriminately, resulting in inefficient resource allocation and degraded reception quality for legacy UEs.
Innovation Solution
A method where UEs perform measurements to select TTI resources closest to those with favorable channel state measurements, applying a negative offset to prioritize resources adjacent to already selected or used sTTIs, thereby preventing resource fragmentation and maintaining consistent automatic gain control (AGC) levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs select sTTI resources indiscriminately, then resource allocation flexibility is improved, but resource fragmentation occurs and reception quality degrades
Solution Approach 1:
The patent applies local quality by making different parts of the TTI resources have different selection priorities. Specifically, sTTI resources adjacent to already-selected sTTI resources are given higher priority through negative offset application, while non-adjacent resources maintain normal selection criteria. This localized differentiation prevents fragmentation by concentrating selections in specific regions rather than uniformly across all resources.
Solution Approach 2:
The patent implements preliminary action by performing channel state measurements and selecting sTTI resources in advance before actual transmission. The base station pre-calculates which sTTI resources should be selected based on channel conditions and the fragmentation prevention criteria, then provides this selection information to UEs. This advance preparation ensures that UEs do not indiscriminately select resources, thereby preventing fragmentation while maintaining flexibility.
2Adaptability or versatility
If multiple TTI lengths are used, then system adaptability is improved, but resource fragmentation and AGC instability occur
Solution Approach 1:
The patent applies local quality by creating different resource selection strategies for different TTI lengths. For sTTI, the system uses negative offset-based selection to prevent fragmentation and maintain AGC stability. For legacy TTI, normal selection criteria apply. This localized differentiation allows the system to support multiple TTI lengths simultaneously while preventing the instability that would result from uniform application of selection criteria across all TTI types.
3Speed
If sTTI resources are selected without constraints, then transmission speed is improved, but resource fragmentation and efficiency decrease
Solution Approach 1:
The patent implements preliminary action by pre-determining valid sTTI resource selections based on channel measurements and fragmentation prevention criteria before actual data transmission. The base station performs channel state measurements, identifies suitable sTTI resources using negative offset methodology, and provides this pre-selected resource information to UEs. This advance preparation enables UEs to immediately transmit at high speed using pre-validated resources, avoiding the need for indiscriminate selection that would cause fragmentation and reduce efficiency.
Data Source
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Figure 2
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AI summary
An embodiment of the present invention relates to a method for a UE transmitting a signal in a wireless communication system supporting a plurality of transmission time interval (TTI) lengths, wherein the signal transmission/reception method comprises the steps of: performing a measurement for each first-TTI resource unit; selecting a first-TTI resource that is the closest to first-TTI resources having measurement results that are greater than or equal to a preset value on the time axis; and transmitting a signal using the selected first-TTI resource.