Dual Timing Advance for Subband Full-Duplex Uplink Alignment

Solution Overview

Problem

Existing technologies face issues of inter-symbol interference caused by downlink signals on uplink transmissions in subband full-duplex systems, leading to degraded uplink reception performance.

Innovation Solution

A method for determining separate timing advance offsets for uplink transmissions on subband and full-uplink resources, ensuring alignment with downlink signals to prevent interference, using different TA amounts for each resource type.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single timing advance amount is used for both uplink transmission on uplink subband and full-uplink transmission, then the device complexity is reduced, but inter-symbol interference occurs between downlink signals and uplink signals

Engineering Contradiction:

Improvetiming advance determinationVSAvoidinter-symbol interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the timing advance determination into two separate components: a first timing advance amount for uplink transmission on uplink subband, and a second timing advance amount for full-uplink transmission. This segmentation allows each transmission type to have its own optimized timing advance value, preventing inter-symbol interference while maintaining manageable device complexity through structured separation of concerns.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by determining different timing advance amounts for different uplink transmission scenarios. The first timing advance amount is specifically optimized for uplink subband transmission, while the second is optimized for full-uplink transmission. This localized optimization ensures that each transmission type receives the appropriate timing adjustment for its specific characteristics, eliminating interference without requiring a completely different system-wide approach.

Inventive Principle:

Principle #3Local quality

2Reliability

If separate timing advance amounts are determined for uplink subband and full-uplink transmission, then uplink reception performance is improved, but the device complexity increases

Engineering Contradiction:

Improveuplink reception performanceVSAvoidtiming advance determination

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the timing advance determination into two separate components: a first timing advance amount for uplink transmission on uplink subband, and a second timing advance amount for full-uplink transmission. This segmentation allows each transmission type to have its own optimized timing advance value, preventing inter-symbol interference while maintaining manageable device complexity through structured separation of concerns.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary action by determining the first and second timing advance amounts in advance, before actual uplink transmissions occur. This preliminary determination allows the device to pre-calculate and store the appropriate timing advance values for different transmission scenarios, reducing real-time computational complexity while ensuring optimal performance when transmissions actually occur.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If the first timing advance amount is increased to align uplink subband transmission, then inter-symbol interference is reduced, but the timing synchronization for full-uplink transmission may be affected

Engineering Contradiction:

Improveinter-symbol interferenceVSAvoidtiming synchronization

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent segments the timing advance determination into two separate components: a first timing advance amount for uplink transmission on uplink subband, and a second timing advance amount for full-uplink transmission. This segmentation allows each transmission type to have its own optimized timing advance value, preventing inter-symbol interference while maintaining manageable device complexity through structured separation of concerns.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by determining different timing advance amounts for different uplink transmission scenarios. The first timing advance amount is specifically optimized for uplink subband transmission, while the second is optimized for full-uplink transmission. This localized optimization ensures that each transmission type receives the appropriate timing adjustment for its specific characteristics, eliminating interference without requiring a completely different system-wide approach.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260052516A1Timing advance determination method, apparatus, terminal and network device

Publication Date: 2026.02.19 DATANG MOBILE COMM EQUIP CO LTD

AI summary

Provided are a timing advance determination method, an apparatus, a terminal, and a network device. The method is applied to a terminal, and comprises: determining a target timing advance offset; and, according to the target timing advance offset, determining a first timing advance (TA) amount and a second TA amount, wherein the first TA amount is used for uplink transmission on a first uplink resource, the second TA amount is used for uplink transmission on a second uplink resource, the first uplink resource is a slot or symbol for an uplink subband, and the second uplink resource is a full-uplink slot or symbol in a bandwidth part (BWP)/carrier/frequency band range.