Flexible Duplex Cell Identifier Management for Spectrum Interference

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Solution Overview

Problem

In wireless communication systems, the imbalance between downlink and uplink radio frequency spectrum bands, such as over-utilization of the downlink band and under-utilization of the uplink band, or differing interference characteristics, can lead to inefficient operations and interference issues.

Innovation Solution

The method involves dynamically managing cell identifiers, quasi-co-location configurations, and rate matching configurations for both downlink transmissions in the downlink radio frequency spectrum band and uplink transmissions in the uplink radio frequency spectrum band, allowing for flexible duplex operations by determining and using separate parameters for each band.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the downlink radio frequency spectrum band is used for downlink transmissions, then downlink communication capacity is improved, but the downlink band becomes over-utilized and causes interference issues

Engineering Contradiction:

Improvedownlink communication capacityVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent utilizes the uplink radio frequency spectrum band (a different dimension/frequency resource) for downlink transmissions. By transitioning from traditional downlink-only usage to cross-band usage, the system allocates downlink traffic to the uplink band, thereby reducing congestion and interference in the original downlink band while maintaining communication capacity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The uplink radio frequency spectrum band is assigned multiple functions: its original uplink transmission function plus a new downlink transmission function. This multi-functionality allows the uplink band to serve both uplink and downlink purposes, balancing spectrum utilization and reducing over-utilization of the dedicated downlink band.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If the uplink radio frequency spectrum band is used for uplink transmissions, then uplink communication capacity is maintained, but the uplink band remains under-utilized

Engineering Contradiction:

Improveuplink communication capacityVSAvoidspectrum resource under-utilization

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system dynamically allocates the uplink band for different purposes based on traffic conditions. When downlink traffic is high, the uplink band is used for downlink transmissions; when uplink traffic is needed, it serves uplink purposes. This dynamic allocation ensures optimal utilization of the uplink band resources.

Inventive Principle:

Principle #15Dynamics

3Reliability

If separate cell identifiers are managed for downlink and uplink bands, then interference characteristics are optimized, but system complexity increases

Engineering Contradiction:

Improveinterference managementVSAvoidparameter management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the cell identifier management into separate entities for downlink and uplink bands. By assigning distinct cell identifiers to each band, the system can independently optimize parameters for each frequency band's specific interference characteristics, improving reliability while managing complexity through structured separation.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10700801B2Techniques for managing cell identifiers and other parameters for flexible duplex operations

Publication Date: 2020.06.30 QUALCOMM INC

AI summary

Techniques are described for wireless communications at a user equipment (UE). One method includes determining a first cell identifier (ID) associated with a first downlink transmission in a first radio frequency spectrum band of paired radio frequency spectrum bands, determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the paired radio frequency spectrum bands, and communicating based on the first cell ID and the second cell ID. In some cases, the method may include determining a cell ID associated with a downlink transmission in an uplink radio frequency spectrum band, and receiving the downlink transmission in a subframe of the uplink radio frequency spectrum band. The downlink transmission may be based on the cell ID and a format of a physical uplink shared channel (PUSCH), and may include an eight layer single-user multiple-input multiple-output (SU-MIMO) transmission.