BWP Switching for Random Access in Wireless Terminals

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently switching between active and initial bandwidth parts (BWPs) for terminals that need to perform random access, particularly when the initial BWP is not configured with a random access related channel.

Innovation Solution

A BWP switching method that allows a terminal to switch from an active BWP to an initial BWP configured with a random access related channel when performing random access, thereby ensuring the availability of necessary channels for successful random access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the terminal switches to an active BWP for normal operation, then communication efficiency is improved, but random access capability is lost when the initial BWP is not configured with random access channel

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidrandom access capability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic BWP switching based on terminal state. The terminal monitors whether it needs to perform random access and automatically switches between active BWP and initial BWP accordingly. This dynamic adaptation resolves the contradiction by making the system flexible enough to maintain random access capability when needed while operating in active BWP for efficiency during normal communication.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the BWP configuration parameter based on random access requirements. When random access is needed, the terminal switches to initial BWP which is configured with random access channel. This parameter change ensures that the necessary random access capability is available while allowing the system to operate in more efficient active BWP when random access is not required.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the terminal always operates on initial BWP with random access channel, then random access reliability is improved, but communication efficiency deteriorates

Engineering Contradiction:

Improverandom access reliabilityVSAvoidcommunication efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic BWP switching based on terminal state. The terminal monitors whether it needs to perform random access and automatically switches between active BWP and initial BWP accordingly. This dynamic adaptation resolves the contradiction by making the system flexible enough to maintain random access capability when needed while operating in active BWP for efficiency during normal communication.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The terminal periodically checks whether random access is needed and switches BWP accordingly. This periodic state assessment allows the terminal to maintain random access reliability by switching to initial BWP when needed, while spending most time in active BWP for efficient communication, thus resolving the contradiction between reliability and efficiency.

Inventive Principle:

Principle #19Periodic action

3Reliability

If the terminal switches from active BWP to initial BWP for random access, then random access success rate is improved, but switching delay is introduced

Engineering Contradiction:

Improverandom access success rateVSAvoidBWP switching delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent configures the initial BWP with random access channel in advance during network setup. This preliminary configuration ensures that when the terminal needs to perform random access, the necessary channel is already available in the initial BWP, allowing quick switching without additional configuration delay. The preliminary preparation of random access resources resolves the contradiction by minimizing the time penalty of BWP switching.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250151120A1Bandwidth part switching method and apparatus, communication device, and storage medium

Publication Date: 2025.05.08 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A bandwidth part (BWP) switching method is performed by a first type of terminal, and includes: switching from an active BWP to an initial BWP, wherein the first type of terminal needs to perform a random access, and the initial BWP is configured with a random access related channel.