Guard Period Allocation for Short TTI Wireless Transmissions

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Solution Overview

Problem

In wireless communication systems, especially those employing shortened transmission time intervals (sTTI), the transient time required for power ON and OFF can cause significant unwanted signals, leading to interference and reduced performance, particularly due to the increased ratio of transient time to sTTI.

Innovation Solution

An apparatus and method are introduced at a first node to determine whether reserved periods are needed between continuous data or signals transmitted based on the length of configured transmission time intervals (TTIs). Specifically, for sTTI cases where the TTI length is shorter than or equal to a threshold, reserved periods are determined to be necessary, optimizing resource utilization and reducing inter-subcarrier interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If transient time is reserved within sTTI, then the transient time impact on transmission/reception is contained, but the ratio of transient time to sTTI becomes large causing heavy impact on desired signal reception

Engineering Contradiction:

Improvetransmission reception stabilityVSAvoidtransient time ratio

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent extracts the transient time period from the sTTI structure by introducing a guard period between consecutive sTTIs. This separates the unwanted transient signals from the desired signal transmission, preventing the transient time from occupying valuable sTTI resources while still containing its impact within the guard period structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The guard period acts as an intermediary element between consecutive sTTIs, providing a buffer zone that absorbs the transient time effects. This intermediary structure prevents direct interference between the transient signals and the desired signals, resolving the contradiction by mediating the interaction between transient time requirements and sTTI efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If transient time is arranged out of sTTI, then the transient time does not occupy sTTI resources, but it interferes with other sTTI reception causing unwanted signals

Engineering Contradiction:

ImprovesTTI resource utilizationVSAvoidinter-subframe interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the transmission structure into distinct components: sTTI for desired signal transmission and guard period for transient time containment. This segmentation allows the transient time to be positioned outside the sTTI boundary while preventing it from interfering with other sTTIs, as the guard period structure confines the transient effects to a designated isolation zone.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent converts the harmful transient time into a beneficial structure by using it to define the guard period boundary. Instead of treating transient time as pure interference, the system utilizes it to establish a natural separation mechanism that protects other sTTIs from interference, transforming the harmful factor into a protective element.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If no reserved period is defined for transient time, then sTTI structure is simple and continuous transmission is maintained, but unwanted signals heavily impact reception performance

Engineering Contradiction:

ImprovesTTI structure complexityVSAvoidsignal reception quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces dynamic adaptability by making the guard period configuration dependent on sTTI length. For shorter sTTIs where transient time ratio is critical, guard periods are configured to contain transient effects. This dynamic approach allows the system to maintain simple structure for long sTTIs while providing necessary protection for short sTTIs, balancing complexity and reliability based on actual transmission requirements.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250039022A1Communication method, communication apparatus and communication system configured to determine whether a reserved period is between two data or signals

Publication Date: 2025.01.30 ARM LTD

AI summary

There are provided an apparatus, a method and a system. The apparatus comprises: a transmitter operative to transmit wireless data or signals to a second node; and a circuitry operative to determine whether one or more reserved periods are reserved between two continuous data or signals transmitted by the transmitter based on a length of configured transmission time intervals (TTIs), wherein the circuitry is further operative to: determine the one or more reserved periods are reserved between two continuous data or signals in a case that the length of configured TTI is shorter than or equal to a threshold.