SBFD PRACH Reporting for Uplink Coverage and RACH Capacity

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Solution Overview

Problem

Existing wireless communication systems face challenges in optimizing sub-band full duplex (SBFD) random access channel (RACH) operations, particularly in configuring PRACH transmissions and reporting information related to these operations, which can lead to inefficiencies in uplink coverage, RACH capacity, and random access latency.

Innovation Solution

User equipment (UE) and network nodes are equipped to transmit and receive information regarding PRACH transmissions associated with SBFD configurations, including details on the number of transmissions, transmit power, and beam information, enabling the network node to adjust configurations for improved RACH performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If PRACH transmissions are configured in SBFD operations, then random access capability is enhanced, but uplink coverage and RACH capacity remain suboptimal

Engineering Contradiction:

Improverandom access capabilityVSAvoiduplink coverage

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The UE reports PRACH transmission information (number of transmissions, transmit power, beam indices) to the network node, enabling the network to adjust SBFD configurations based on actual transmission performance and coverage requirements

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The network node adjusts SBFD configuration parameters (number of uplink subbands, frequency locations, guard band sizes) based on UE feedback to optimize both random access capability and uplink coverage

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If PRACH transmissions are configured in SBFD operations, then random access capability is enhanced, but RACH capacity is limited

Engineering Contradiction:

Improverandom access capabilityVSAvoidRACH capacity

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The available spectrum is divided into multiple uplink subbands within the SBFD configuration, allowing PRACH transmissions to be distributed across multiple frequency segments, thereby increasing overall RACH capacity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system introduces frequency domain segmentation through multiple uplink subbands, transforming the single-dimension RACH access into multi-dimensional access across different frequency segments

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If PRACH transmissions are configured in SBFD operations, then random access capability is enhanced, but random access latency increases

Engineering Contradiction:

Improverandom access capabilityVSAvoidrandom access latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The network node pre-configures multiple SBFD parameters including multiple uplink subbands and their frequency locations before random access, enabling the UE to immediately select an available subband without additional configuration delays

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250380308A1User equipment report of sub-band full duplex random access channel operation

Publication Date: 2025.12.11 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a physical random access channel (PRACH) transmission in association with a sub-band full duplex (SBFD) configuration. The UE may transmit information regarding the PRACH transmission in association with the SBFD configuration. Numerous other aspects are described.