SubBand Full Duplex Resource Assignment for Uplink Coverage

Solution Overview

Problem

In time division duplex (TDD) operations of radio access networks, uplink coverage is limited by the TDD pattern, which restricts the maximum allowable transmission power for wireless terminals, leading to inadequate resource allocation for uplink channels, thereby affecting network performance.

Innovation Solution

The implementation of SubBand Full Duplex (SBFD) technology in wireless terminals, which allows for simultaneous downlink and uplink transmissions by determining resource assignments that overlap with synchronization signals in the time domain, enabling efficient resource management and allocation for uplink channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If TDD pattern is used to allocate time slots for uplink and downlink transmissions, then network can manage traffic direction, but uplink coverage is limited by maximum allowable transmission power

Engineering Contradiction:

Improvemaximum allowable transmission powerVSAvoiduplink coverage

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent implements dynamic TDD pattern adjustment where the network can frequently change the ratio of uplink to downlink time slots based on real-time traffic demand. This allows the system to adaptively allocate more uplink resources when uplink coverage is needed, rather than being constrained by a fixed TDD pattern, thereby resolving the contradiction between power management and coverage reliability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameter of time slot allocation ratio dynamically. By adjusting the number and position of uplink time slots within the TDD frame structure based on traffic conditions, the network can increase maximum allowable transmission power for uplink when needed, thus improving uplink coverage while maintaining overall network efficiency

Inventive Principle:

Principle #35Parameter changes

2Productivity

If TDD pattern allocates more time slots for downlink transmission, then downlink capacity increases, but uplink coverage is limited due to less uplink resources

Engineering Contradiction:

Improvedownlink capacityVSAvoiduplink coverage

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent enables dynamic reconfiguration of TDD patterns where the network can switch between different uplink-downlink configurations based on real-time traffic demands. When downlink capacity is needed, more downlink slots are allocated; when uplink coverage is needed, the pattern shifts to provide more uplink slots, thus dynamically balancing both requirements without being constrained by a fixed pattern

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements periodic evaluation and adjustment of TDD patterns. By continuously monitoring traffic conditions and periodically reconfiguring the time slot allocation, the network can ensure that both downlink capacity and uplink coverage requirements are met over time, even if one parameter is temporarily prioritized in specific periods

Inventive Principle:

Principle #19Periodic action

3Reliability

If TDD pattern allocates more time slots for uplink transmission, then uplink coverage improves, but downlink traffic capacity is reduced

Engineering Contradiction:

Improveuplink coverageVSAvoiddownlink traffic capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic TDD pattern adjustment where the network can frequently change the ratio of uplink to downlink time slots based on real-time traffic demand. This allows the system to adaptively allocate more uplink resources when uplink coverage is needed, rather than being constrained by a fixed TDD pattern, thereby resolving the contradiction between power management and coverage reliability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements periodic evaluation and adjustment of TDD patterns. By continuously monitoring traffic conditions and periodically reconfiguring the time slot allocation, the network can ensure that both downlink capacity and uplink coverage requirements are met over time, even if one parameter is temporarily prioritized in specific periods

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20240155619A1Communications network and methods with enhanced duplex

Publication Date: 2024.05.09 SHARP KK

AI summary

A wireless terminal communicates across a radio interface with a radio access network. The wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive a downlink signal from the radio access network. The processor circuitry is configured to determine a resource assignment (mapping) of the downlink signal to a resource grid of time/frequency radio resources in a SubBand Full Duplex, SBFD, region of the grid in a case that a SBFD uplink, UL, resource set overlaps with a synchronization signal/physical broadcast, SS/PBCH, block in a time domain of the SBFD region.