SRS Bandwidth Aggregation Guard Period Handling

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Solution Overview

Problem

Existing wireless communication systems face challenges in accurately determining positioning and timing for communications between devices, particularly in non-stationary environments, due to limitations in reference signal usage and bandwidth aggregation techniques.

Innovation Solution

The proposed solution involves using sounding reference signals for positioning, transmitted via bandwidth aggregation on component carriers without uplink data channels. A guard period is implemented before and after the sounding reference signal transmissions, and a capability message is used to indicate which bands may be impacted by the guard period and through which bands a wireless device can receive downlink signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If bandwidth aggregation is used to transmit sounding reference signals on component carriers without uplink data channels, then positioning accuracy is improved, but interference from guard periods increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidguard period interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The capability message enables the network to identify specific frequency bands where guard period interference occurs and apply localized adjustments only to those affected bands. This allows sounding reference signals to be transmitted with optimal parameters in unaffected bands while using modified parameters or reduced power in bands with guard period interference, thereby improving overall positioning accuracy without unnecessarily compromising transmission in all bands.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The capability message conveys information about guard period impact that enables the network to change transmission parameters such as power level, timing, or frequency allocation for sounding reference signals in affected bands. By dynamically adjusting these parameters based on the capability information, the system can mitigate guard period interference while maintaining positioning accuracy in non-affected bands.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If guard periods are added before and after sounding reference signal transmissions, then timing accuracy is improved, but communication efficiency deteriorates

Engineering Contradiction:

Improvetiming accuracyVSAvoidcommunication efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The capability message enables segmentation of frequency bands into affected and non-affected groups. Guard periods can then be applied only to sounding reference signal transmissions in bands where timing accuracy is compromised without guard periods, while transmissions in non-affected bands can proceed without additional guard periods, thereby maintaining communication efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of applying guard periods universally to all sounding reference signal transmissions, the capability message allows the network to apply guard periods partially only where necessary (in affected bands). This partial action approach maintains timing accuracy where needed while avoiding the communication efficiency loss that would result from universal application of guard periods.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If capability messages are used to indicate band-specific guard period impact, then system adaptability is improved, but message complexity increases

Engineering Contradiction:

Improveband-specific configuration flexibilityVSAvoidcapability message structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The capability message is designed to serve multiple functions: it identifies affected frequency bands, conveys the nature of guard period impact, and enables network-side decisions about transmission parameter adjustments. By consolidating these multiple functions into a single message structure, the system achieves high adaptability without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The capability message introduces a new dimension of information organization by categorizing frequency bands based on their guard period sensitivity. This dimensional approach (grouping bands by characteristics rather than treating each individually) enables the network to efficiently manage band-specific configurations with reduced overall complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20250141629A1Conflict Handling in Bandwidth Aggregation

Publication Date: 2025.05.01 COMCAST CABLE COMM LLC

AI summary

One or more parameters may be used to configure wireless communications between a wireless device and a base station. Configuration parameters may indicate SRS resources for sounding reference signal (SRS) bandwidth aggregation of component carriers. A capability message may indicate wireless device transmission and/or reception capability for one or more bands during a guard period of SRS bandwidth aggregation. At least some component carriers may lack an uplink channel and downlink transmission may not be received during the guard period, for example, based on the capability message indicating simultaneous transmission and reception is not supported for one or more bands.