Dynamic TDD Reservation Signal for Interference Coordination

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Solution Overview

Problem

Dynamic Time Duplex Division (TDD) in wireless communication systems often causes signal interference, and existing solutions using clear-to-send (CTS) or ready-to-send (RTS) signaling result in unnecessary overhead due to additional signaling between base stations and user equipment (UEs).

Innovation Solution

Implementing a reservation signal system where a network node (base station or UE) reserves a resource for Downlink (DL) or Uplink (UL) transmissions by transmitting a reservation signal on a designated resource prior to using it, allowing nodes to monitor and adjust their transmissions to avoid interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If CTS or RTS signaling is used to manage dynamic TDD interference, then signal interference is reduced, but signaling overhead increases due to additional messages between base stations and UEs

Engineering Contradiction:

Improvesignal interferenceVSAvoidsignaling overhead

Core Design Contradiction:

Object-affected harmful factorsVSLoss of substance

Solution Approach 1:

The patent extracts the interference management function from the traditional CTS/RTS signaling framework and implements it directly through dynamic TDD resource allocation and reservation signals between base stations, eliminating the need for additional CTS/RTS messaging between base stations and UEs while maintaining interference coordination

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces reservation signals as intermediaries that base stations transmit to indicate their intended use of dynamic TDD resources, allowing other base stations to detect and avoid interference without requiring complex CTS/RTS exchange protocols involving UEs

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If dynamic TDD resource allocation is implemented to improve communication efficiency, then resource utilization increases, but signal interference between simultaneous transmissions increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidsignal interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by having base stations transmit reservation signals before actual data transmissions to announce their intended use of dynamic TDD resources, allowing other base stations to detect these reservations and adjust their transmissions accordingly, thereby preventing interference before it occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where base stations monitor reservation signals from other base stations and adjust their resource allocation decisions based on detected reservations, creating a closed-loop system that dynamically coordinates transmissions to avoid interference while maintaining high resource utilization

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12120554B2Techniques for dynamic time duplex division with reservation signal and contention

Publication Date: 2024.10.15 QUALCOMM INC

AI summary

Techniques for dynamic time duplex division (TDD) with reservation signal and contention may include a first network node configured to select a first resource to reserve for use of a downlink (DL) transmission or an uplink (UL) transmission. The first network node may also be configured to transmit, to a second network node, a reservation signal on a reservation signal resource to announce that the first resource is reserved for use of the DL transmission or the UL transmission by the first network node. The reservation signal resource may be associated with the first resource.