Base Station TDD Slot Negotiation for Cross-Link Interference

Solution Overview

Problem

Cross-link interference occurs between wireless base stations using time division duplex (TDD) protocols when one station's downlink timeslots overlap with another's uplink timeslots, exacerbated by technologies like Sub-Band Full Duplex and dynamic TDD.

Innovation Solution

Negotiated TDD DL-UL configurations where base stations exchange intended communication patterns, allowing them to agree on mutually acceptable time division duplex configurations to minimize interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If base stations use TDD protocol to communicate with UEs, then communication efficiency is improved, but cross-link interference occurs between adjacent base stations

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidcross-link interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by having base stations exchange intended TDD DL-UL configurations before actual communication begins. The first base station sends a message to the second base station proposing its intended timeslot configuration, allowing both stations to preemptively identify and resolve potential cross-link interference issues before they occur during data transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback through the message exchange mechanism where the first base station receives feedback from the second base station regarding its intended configuration. This feedback loop enables both base stations to adjust their TDD settings based on mutual information, ensuring compatible communication schedules that avoid interference while maintaining efficiency.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If dynamic TDD is used to adapt to changing traffic conditions, then network flexibility is improved, but cross-link interference between base stations increases

Engineering Contradiction:

Improvenetwork flexibilityVSAvoidcross-link interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by having base stations exchange intended TDD DL-UL configurations before actual communication begins. The first base station sends a message to the second base station proposing its intended timeslot configuration, allowing both stations to preemptively identify and resolve potential cross-link interference issues before they occur during data transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback through the message exchange mechanism where the first base station receives feedback from the second base station regarding its intended configuration. This feedback loop enables both base stations to adjust their TDD settings based on mutual information, ensuring compatible communication schedules that avoid interference while maintaining flexibility.

Inventive Principle:

Principle #23Feedback

3Productivity

If Sub-Band Full Duplex is implemented to increase spectral efficiency, then data transmission capacity is improved, but cross-link interference is exacerbated

Engineering Contradiction:

Improvedata transmission capacityVSAvoidcross-link interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by having base stations exchange intended TDD DL-UL configurations before actual communication begins. The first base station sends a message to the second base station proposing its intended timeslot configuration, allowing both stations to preemptively identify and resolve potential cross-link interference issues before they occur during data transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback through the message exchange mechanism where the first base station receives feedback from the second base station regarding its intended configuration. This feedback loop enables both base stations to adjust their TDD settings based on mutual information, ensuring compatible communication schedules that avoid interference while maintaining capacity.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250358087A1Negotiated time division duplex downlink-uplink configurations

Publication Date: 2025.11.20 CHARTER COMM OPERATING LLC

AI summary

A first wireless base station sends, to a second wireless base station, a first message that includes an intended time division duplex (TDD) downlink (DL)-uplink (UL) configuration of the first wireless base station that identifies a first pattern of uplink timeslots and downlink timeslots that the first wireless base station proposes to utilize to communicate with one or more user equipments (UEs) in a service area of the first wireless base station. The first wireless base station receives, from the second wireless base station, a second message comprising an acceptance message that accepts the intended TDD DL-UL configuration of the first wireless base station or a rejection message that rejects the intended TDD DL-UL configuration of the first wireless base station.