Uplink Channel Spatial Selection for Full- and Half-Duplex Modes

Solution Overview

Problem

In full-duplex communication systems, the assumption of uplink and downlink channel reciprocity is compromised due to independent transmit and receive antennas, leading to degraded uplink channel transmission performance, especially in switching between full-duplex and half-duplex modes.

Innovation Solution

The method involves configuring spatial attributes for uplink channels based on slot formats, slot types, and subband full duplex information to optimize antenna configurations, allowing terminals to send target channels like CG PUSCH or CG PUCCH using suitable spatial attributes, thereby improving transmission performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If separate antennas are used for transmission and reception in full-duplex mode, then transmission and reception can occur simultaneously, but channel reciprocity between uplink and downlink is compromised

Engineering Contradiction:

Improvesimultaneous transmission and reception capabilityVSAvoidchannel reciprocity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the spatial attribute parameters dynamically based on duplex mode. In full-duplex mode, the terminal determines spatial attributes independently without relying on downlink channel measurements, while in half-duplex mode, it uses downlink channel state information to determine uplink spatial attributes, thus adapting the parameter selection to the operating mode

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamic switching between different spatial attribute determination methods based on the duplex mode. The terminal can switch between using independent spatial attribute determination (full-duplex) and downlink-based spatial attribute determination (half-duplex), making the system flexible and adaptive to different operational requirements

Inventive Principle:

Principle #15Dynamics

2Loss of information

If channel reciprocity is assumed in TDD mode, then measurement overhead is reduced, but this assumption does not hold in full-duplex mode with independent antennas

Engineering Contradiction:

Improvemeasurement overheadVSAvoidchannel reciprocity assumption validity

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent changes the spatial attribute parameters dynamically based on duplex mode. In full-duplex mode, the terminal determines spatial attributes independently without relying on downlink channel measurements, while in half-duplex mode, it uses downlink channel state information to determine uplink spatial attributes, thus adapting the parameter selection to the operating mode

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

In full-duplex mode, the terminal performs self-service by independently determining its own spatial attributes based on local channel state information and slot format indicators, without requiring the network to provide explicit spatial attribute configurations, thus reducing signaling overhead while maintaining reliability

Inventive Principle:

Principle #25Self-service

3Device complexity

If spatial attributes are not optimized for different duplex modes, then system complexity is reduced, but uplink channel transmission performance degrades

Engineering Contradiction:

Improvespatial attribute configuration complexityVSAvoiduplink channel transmission performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes the spatial attribute parameters dynamically based on duplex mode. In full-duplex mode, the terminal determines spatial attributes independently without relying on downlink channel measurements, while in half-duplex mode, it uses downlink channel state information to determine uplink spatial attributes, thus adapting the parameter selection to the operating mode

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The network pre-configures slot format indicators and subband full duplex indication information that contain spatial attribute determination rules. The terminal uses these pre-configured parameters to determine appropriate spatial attributes before transmission, avoiding complex real-time negotiations and reducing system complexity

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250287382A1Uplink channel transmission method and apparatus, and terminal and network-side device

Publication Date: 2025.09.11 VIVO MOBILE COMM CO LTD

AI summary

This application discloses an uplink channel transmission method and apparatus, a terminal, and a network-side device, and relates to the field of communication technologies. The uplink channel transmission method in embodiments of this application includes: receiving, by a terminal, at least one channel configuration from a network-side device, where the channel configuration is used to indicate at least one target channel, and each target channel corresponds to at least one spatial attribute; and sending, by the terminal, the target channel based on first information, where a spatial attribute used to send the target channel is determined based on the first information, the target channel includes a configured grant physical uplink shared channel PUSCH or a configured grant physical uplink control channel PUCCH, and the first information includes at least one of the following: a slot format, a slot type, and subband full duplex configuration information or subband full duplex indication information.